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Chen Y, Li A, Jiang S. Wettability and Mechanical Properties of Red Mud-Al 2O 3 Composites. MATERIALS (BASEL, SWITZERLAND) 2024; 17:1095. [PMID: 38473567 DOI: 10.3390/ma17051095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 02/15/2024] [Accepted: 02/23/2024] [Indexed: 03/14/2024]
Abstract
In 2023, the global production of new red mud is expected to reach nearly 200 million tons, but less than 10% of it is currently being utilized in an environmentally friendly manner. To reduce the sintering temperature of alumina ceramics, a sintering aid method is used, as high-purity alumina ceramics require a solid-phase sintering temperature of over 1700 °C. The metal oxides present in red mud are necessary components for high-performance composite alumina ceramics. Composites were obtained by mixing and sintering red mud and Al2O3. This study focused on the mechanical properties and wettability of these composites. The results indicated that the 10% red mud-Al2O3 composite exhibited the highest hardness (20.12 GPa) and flexural strength (346 MPa). This is attributed to the formation of a mineral phase dominated by CaAl12O19, generated by the red mud during the sintering process, which filled the pores and reduced porosity. The surface energy of the red mud-Al2O3 composite was the highest at room temperature and high temperature, reaching 49.60 mJ·m-2 and 1164.7 mJ·m-2, respectively, indicating that it has better stability at both room and high temperatures. This study provides an important fundamental basis for the application of red mud-alumina composites to replace alumina-based composites in the field of construction materials, molten metal filters, ceramic cleavers, etc.
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Affiliation(s)
- Yongliang Chen
- School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
| | - Anmin Li
- School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
- State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures, Guangxi University, Nanning 530004, China
| | - Shiwei Jiang
- School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
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Zeng Y, Wang Z, Pan Z, Shen L, Teng J, Lin H, Zhang J. Novel thermodynamic mechanisms of co-conditioning with polymeric aluminum chloride and polyacrylamide for improved sludge dewatering: A paradigm shift in the field. ENVIRONMENTAL RESEARCH 2023; 234:116420. [PMID: 37327838 DOI: 10.1016/j.envres.2023.116420] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Revised: 05/25/2023] [Accepted: 06/13/2023] [Indexed: 06/18/2023]
Abstract
This study investigated the combined effects of polymeric aluminum chloride (PAC) and polyacrylamide (PAM) on sludge dewatering, aiming to unveil underlying mechanisms. Co-conditioning with 15 mg g-1 PAC and 1 mg g-1 PAM achieved optimal dewatering, reducing specific filtration resistance (SFR) of co-conditioned sludge to 4.38 × 1012 m-1kg-1, a mere 48.1% of raw sludge's SFR. Compared with the CST of raw sludge (36.45 s), sludge sample can be significantly reduced to 17.7 s. Characterization tests showed enhanced neutralization and agglomeration in co-conditioned sludge. Theoretical calculations revealed elimination of interaction energy barriers between sludge particles post co-conditioning, converting sludge surface from hydrophilic (3.03 mJ m-2) to hydrophobic (-46.20 mJ m-2), facilitating spontaneous agglomeration. Findings explain improved dewatering performance. Based on Flory-Huggins lattice theory, connection between polymer structure and SFR was established. Raw sludge formation triggered significant change in chemical potential, increasing bound water retention capacity and SFR. In contrast, co-conditioned sludge exhibited thinnest gel layer, reducing SFR and significantly improving dewatering. These findings represent a paradigm shift, shedding new light on fundamental thermodynamic mechanisms of sludge dewatering with different chemical conditioning.
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Affiliation(s)
- Yansha Zeng
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China; Key Laboratory of Watershed Earth Surface Processes and Ecological Security, Zhejiang Normal University, Jinhua, 321004, China.
| | - Zhe Wang
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China; Key Laboratory of Watershed Earth Surface Processes and Ecological Security, Zhejiang Normal University, Jinhua, 321004, China.
| | - Zhenxiang Pan
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China; Key Laboratory of Watershed Earth Surface Processes and Ecological Security, Zhejiang Normal University, Jinhua, 321004, China.
| | - Liguo Shen
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China; Key Laboratory of Watershed Earth Surface Processes and Ecological Security, Zhejiang Normal University, Jinhua, 321004, China.
| | - Jiaheng Teng
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China; Key Laboratory of Watershed Earth Surface Processes and Ecological Security, Zhejiang Normal University, Jinhua, 321004, China.
| | - Hongjun Lin
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China; Key Laboratory of Watershed Earth Surface Processes and Ecological Security, Zhejiang Normal University, Jinhua, 321004, China.
| | - Jianzhen Zhang
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China; Key Laboratory of Watershed Earth Surface Processes and Ecological Security, Zhejiang Normal University, Jinhua, 321004, China.
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Cho D, Oh JK. Silica Nanoparticle-Infused Omniphobic Polyurethane Foam with Bacterial Anti-Adhesion and Antifouling Properties for Hygiene Purposes. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2035. [PMID: 37513046 PMCID: PMC10385342 DOI: 10.3390/nano13142035] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 07/05/2023] [Accepted: 07/07/2023] [Indexed: 07/30/2023]
Abstract
In this study, a method for preventing cross-infection through the surface coating treatment of polyurethane (PU) foam using functionalized silica nanoparticles was developed. Experimental results confirmed that the fabricated PU foam exhibited omniphobic characteristics, demonstrating strong resistance to both polar and nonpolar contaminants. Additionally, quantitative analysis using the pour plate method and direct counting with a scanning electron microscope determined that the treated material exhibited anti-adhesion properties against bacteria. The fabricated PU foam also demonstrated a high level of resistance to the absorption of liquids commonly found in medical facilities, including blood, 0.9% sodium chloride solution, and 50% glycerol. Mechanical durability and stability were verified through repeated compression tests and chemical leaching tests, respectively. The proposed coated PU foam is highly effective at preventing fouling from polar and nonpolar fluids as well as bacteria, making it well-suited for use in a range of fields requiring strict hygiene standards, including the medical, food, and environmental industries.
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Affiliation(s)
- Dongik Cho
- Department of Polymer Science and Engineering, Dankook University, 152 Jukjeon-ro, Suji-gu, Yongin-si 16890, Gyeonggi-do, Republic of Korea
| | - Jun Kyun Oh
- Department of Polymer Science and Engineering, Dankook University, 152 Jukjeon-ro, Suji-gu, Yongin-si 16890, Gyeonggi-do, Republic of Korea
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Beyond brewing: β-acid rich hop extract in the development of a multifunctional polylactic acid-based food packaging. Int J Biol Macromol 2023; 228:23-39. [PMID: 36565824 DOI: 10.1016/j.ijbiomac.2022.12.191] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 12/08/2022] [Accepted: 12/17/2022] [Indexed: 12/24/2022]
Abstract
Hops' (Humulus lupulus L.) phytochemicals are well known for their bioactivity. In the present study, the functional properties of hop extract rich in β-acids, as potassium-salts structures (KBA), were investigated to develop a sustainable active food packaging. Polylactic acid (PLA)-based sheets were incorporated with increasing concentrations of hop extract (0.1-5 % w/w in terms of KBA) and characterized through performance and bioactive properties. KBA-added sheets presented decreased crystallinity and affected mechanical and thermal properties, especially with higher KBA amounts. The sheets' surface hydrophobicity gradually decreased by KBA-extract addition, while the water vapor permeability was not affected. A Fickian diffuse behavior and a better fit to application in fatty foods were observed during release tests. UV-blocking and antioxidant properties were improved by KBA incorporation. Furthermore, results from antibacterial assays revealed great susceptibility of Staphylococcus aureus and Listeria monocytogenes towards sheets added with 5 % of KBA. Moreover, the atomic force microscopy (AFM) observations revealed that KBA led to strong effects on the cell membranes of both bacteria, including disruption of membrane integrity and cell death. Therefore, this study is a sign of great prospects of hop β-acids use, as KBA compound, in the production of sustainable active packaging for safe food shelf-life extension.
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Salatto D, Huang Z, Benziger PT, Carrillo JMY, Bajaj Y, Gauer A, Tsapatsaris L, Sumpter BG, Li R, Takenaka M, Yin W, Thanassi DG, Endoh M, Koga T. Structure-Based Design of Dual Bactericidal and Bacteria-Releasing Nanosurfaces. ACS APPLIED MATERIALS & INTERFACES 2023; 15:3420-3432. [PMID: 36600562 DOI: 10.1021/acsami.2c18121] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Here, we report synergistic nanostructured surfaces combining bactericidal and bacteria-releasing properties. A polystyrene-block-poly(methyl methacrylate) (PS-block-PMMA) diblock copolymer is used to fabricate vertically oriented cylindrical PS structures ("PS nanopillars") on silicon substrates. The results demonstrate that the PS nanopillars (with a height of about 10 nm, size of about 50 nm, and spacing of about 70 nm) exhibit highly effective bactericidal and bacteria-releasing properties ("dual properties") against Escherichia coli for at least 36 h of immersion in an E. coli solution. Interestingly, the PS nanopillars coated with a thin layer (≈3 nm thick) of titanium oxide (TiO2) ("TiO2 nanopillars") show much improved dual properties against E. coli (a Gram-negative bacterium) compared to the PS nanopillars. Moreover, the dual properties emerge against Listeria monocytogenes (a Gram-positive bacterium). To understand the mechanisms underlying the multifaceted property of the nanopillars, coarse-grained molecular dynamics (MD) simulations of a lipid bilayer (as a simplified model for E. coli) in contact with a substrate containing hexagonally packed hydrophilic nanopillars were performed. The MD results demonstrate that when the bacterium-substrate interaction is strong, the lipid heads adsorb onto the nanopillar surfaces, conforming the shape of a lipid bilayer to the structure/curvature of nanopillars and generating high stress concentrations within the membrane (i.e., the driving force for rupture) at the edge of the nanopillars. Membrane rupture begins with the formation of pores between nanopillars (i.e., bactericidal activity) and ultimately leads to the membrane withdrawal from the nanopillar surface (i.e., bacteria-releasing activity). In the case of Gram-positive bacteria, the adhesion area to the pillar surface is limited due to the inherent stiffness of the bacteria, creating higher stress concentrations within a bacterial cell wall. The present study provides insight into the mechanism underlying the "adhesion-mediated" multifaceted property of nanosurfaces, which is crucial for the development of next-generation antibacterial surface coatings for relevant medical applications.
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Affiliation(s)
- Daniel Salatto
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York11794-2275, United States
| | - Zhixing Huang
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York11794-2275, United States
| | - Peter Todd Benziger
- Department of Microbiology and Immunology, Stony Brook University, Stony Brook, New York11794-5222, United States
- Center for Infectious Diseases, Stony Brook University, Stony Brook, New York11794-5120, United States
| | - Jan-Michael Y Carrillo
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee37831, United States
| | - Yashasvi Bajaj
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York11794-2275, United States
| | - Aiden Gauer
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York11794-2275, United States
| | - Leonidas Tsapatsaris
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York11794-2275, United States
| | - Bobby G Sumpter
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee37831, United States
| | - Ruipeng Li
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York11973, United States
| | - Mikihito Takenaka
- Institute for Chemical Research, Kyoto University, Uji, Kyoto611-0011, Japan
| | - Wei Yin
- Department of Biomedical engineering, Stony Brook University, Stony Brook, New York11794-5281, United States
| | - David G Thanassi
- Department of Microbiology and Immunology, Stony Brook University, Stony Brook, New York11794-5222, United States
- Center for Infectious Diseases, Stony Brook University, Stony Brook, New York11794-5120, United States
| | - Maya Endoh
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York11794-2275, United States
| | - Tadanori Koga
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York11794-2275, United States
- Department of Chemistry, Stony Brook University, Stony Brook, New York11794-3400, United States
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Carpenter J, Kim H, Suarez J, van der Zande A, Miljkovic N. The Surface Energy of Hydrogenated and Fluorinated Graphene. ACS APPLIED MATERIALS & INTERFACES 2023; 15:2429-2436. [PMID: 36563177 DOI: 10.1021/acsami.2c18329] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The surface energy of graphene and its chemical derivatives governs fundamental interfacial interactions like molecular assembly, wetting, and doping. However, quantifying the surface energy of supported two-dimensional (2D) materials, such as graphene, is difficult because (1) they are so thin that electrostatic interactions emanating from the underlying substrate are not completely screened, (2) the contribution from the monolayer is sensitive to its exact chemical state, and (3) the adsorption of airborne contaminants, as well as contaminants introduced during transfer processing, screens the electrostatic interactions from the monolayer and underlying substrate, changing the determined surface energy. Here, we determine the polar and dispersive surface energy of bare, fluorinated, and hydrogenated graphene through contact angle measurements with water and diiodomethane. We accounted for many contributing factors, including substrate surface energies and combating adsorption of airborne contaminants. Hydrogenating graphene raises its polar surface energy with little effect on its dispersive surface energy. Fluorinating graphene lowers its dispersive surface energy with a substrate-dependent effect on its polar surface energy. These results unravel how changing the chemical structure of graphene modifies its surface energy, with applications for hybrid nanomaterials, bioadhesion, biosensing, and thin-film assembly.
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Affiliation(s)
- James Carpenter
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
| | - Hyunchul Kim
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
| | - Jules Suarez
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
| | - Arend van der Zande
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, United States
| | - Nenad Miljkovic
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, United States
- Department of Electrical and Computer Engineering, University of Illinois, Urbana, Illinois 61801, United States
- International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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Functionalized Self-Assembled Monolayers: Versatile Strategies to Combat Bacterial Biofilm Formation. Pharmaceutics 2022; 14:pharmaceutics14081613. [PMID: 36015238 PMCID: PMC9415113 DOI: 10.3390/pharmaceutics14081613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 07/29/2022] [Accepted: 07/30/2022] [Indexed: 11/16/2022] Open
Abstract
Bacterial infections due to biofilms account for up to 80% of bacterial infections in humans. With the increased use of antibiotic treatments, indwelling medical devices, disinfectants, and longer hospital stays, antibiotic resistant infections are sharply increasing. Annual deaths are predicted to outpace cancer and diabetes combined by 2050. In the past two decades, both chemical and physical strategies have arisen to combat biofilm formation on surfaces. One such promising chemical strategy is the formation of a self-assembled monolayer (SAM), due to its small layer thickness, strong covalent bonds, typically facile synthesis, and versatility. With the goal of combating biofilm formation, the SAM could be used to tether an antibacterial agent such as a small-molecule antibiotic, nanoparticle, peptide, or polymer to the surface, and limit the agent’s release into its environment. This review focuses on the use of SAMs to inhibit biofilm formation, both on their own and by covalent grafting of a biocidal agent, with the potential to be used in indwelling medical devices. We conclude with our perspectives on ongoing challenges and future directions for this field.
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Zeng W, Li P, Huang Y, Xia A, Zhu X, Zhu X, Liao Q. How Interfacial Properties Affect Adhesion: An Analysis from the Interactions between Microalgal Cells and Solid Substrates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:3284-3296. [PMID: 35231169 DOI: 10.1021/acs.langmuir.2c00042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Microalgal biofilm, a stable community of many algal cells attached to a solid substrate, plays a significant role in the efficient accumulation of renewable energy feedstocks, wastewater treatment, and carbon reduction. The adhesion tendency of microalgal cells on solid substrates is the basis for controlling the formation and development of microalgal biofilm. To promote the adhesion of microalgal cells on solid substrates, it is necessary to clarify which surface properties have to be changed in the most critical factors affecting the adhesion. However, there have been few systematic discussions on what surface properties influence the adhesion tendency of algal cells on solid substrates. In this study, the essential principle of microalgal cell adhesion onto solid substrates was explored from the perspective of the interaction energy between microalgal cells and solid substrates. The influence of surface properties between microalgal cells and solid substrates on interaction energies was discussed via extended Derjaguin-Landau-Verwey-Overbeek (eDLVO) theory and a sensitivity analysis. The results showed that surface properties, including surface potential (ξ) and surface free energy components, significantly affect the adhesion tendency of microalgal cells on different solid substrates. When the solid surface possesses positive charges (ξ > 0), reducing ξ or the electron donor components of the solid substrate (γs-) is an effective measure to promote microalgal cell adhesion onto the solid substrate. When the solid surface possesses negative charges (ξ < 0), an increase in either γs- or the absolute value of ξ should be avoided in the process of microalgae adhesion. Overall, this research provides a direction for the selection of solid substrates and a direction for surface modification to facilitate the adhesion tendency of microalgal cells on solid substrates under different scenarios.
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Affiliation(s)
- Weida Zeng
- Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China
- Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
| | - Peirong Li
- Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China
- Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
| | - Yun Huang
- Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China
- Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
| | - Ao Xia
- Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China
- Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
| | - Xianqing Zhu
- Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China
- Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
| | - Xun Zhu
- Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China
- Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
| | - Qiang Liao
- Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China
- Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
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Aasim M, Khan MH, Bibi NS, Fernandez-Lahore M. Understanding the interaction of proteins to ion exchange chromatographic supports: A surface energetics approach. Biotechnol Prog 2022; 38:e3232. [PMID: 35037430 DOI: 10.1002/btpr.3232] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 12/17/2021] [Accepted: 01/10/2022] [Indexed: 11/10/2022]
Abstract
Ion exchange chromatography is one of the most widely used chromatographic technique for the separation and purification of important biological molecules. Due to its wide applicability in separation processes, a targeted approach is required to suggest the effective binding conditions during ion exchange chromatography. A surface energetics approach was used to study the interaction of proteins to different types of ion exchange chromatographic beads. The basic parameters used in this approach are derived from the contact angle, streaming potential, and zeta potential values. The interaction of few model proteins to different anionic and cationic exchanger, with different backbone chemistry i.e., agarose and methacrylate, was performed. Generally, under binding conditions, it was observed that proteins having negative surface charges showed strong to lose interaction (20 kT for Hannilase to 0.5 kT for IgG) with different anionic exchangers (having different positive surface charges). On the contrary, anionic exchangers showed almost no interaction (0 - 0.1 kT) with the positively charged proteins. An inverse behavior was observed for the interaction of proteins to cationic exchangers. The outcome from these theoretical calculations can predict the binding behavior of different proteins under real ion exchange chromatographic conditions. This will ultimately propose a better bioprocess design for protein separation. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Muhammad Aasim
- Department of Biotechnology, University of Malakand, Lower Dir, Khyber Pakhtunkhwa, Pakistan
| | - Muhammad H Khan
- School of Life Sciences, University of Science and Technology of China, Hefei, Anhui, P. R. China
| | - Noor Shad Bibi
- Department of Biochemistry, Abdul Wali Khan University Mardan, Khyber Pakhtunkhwa, Pakistan
| | - Marcelo Fernandez-Lahore
- Downstream Bioprocessing Laboratory, School of Engineering and Science, Jacobs University, Campus Ring 1, Bremen, Germany
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Ismail MF, Islam MA, Khorshidi B, Tehrani-Bagha A, Sadrzadeh M. Surface characterization of thin-film composite membranes using contact angle technique: Review of quantification strategies and applications. Adv Colloid Interface Sci 2022; 299:102524. [PMID: 34620491 DOI: 10.1016/j.cis.2021.102524] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 09/17/2021] [Accepted: 09/18/2021] [Indexed: 02/08/2023]
Abstract
Thin-film composite (TFC) membranes are the most widely used membranes for low-cost and energy-efficient water desalination processes. Proper control over the three influential surface parameters, namely wettability, roughness, and surface charge, is vital in optimizing the TFC membrane surface and permeation properties. More specifically, the surface properties of TFC membranes are often tailored by incorporating novel special wettability materials to increase hydrophilicity and tune surface physicochemical heterogeneity. These essential parameters affect the membrane permeability and antifouling properties. The membrane surface characterization protocols employed to date are rather controversial, and there is no general agreement about the metrics used to evaluate the surface hydrophilicity and physicochemical heterogeneity. In this review, we surveyed and critically evaluated the process that emerged for understanding the membrane surface properties using the simple and economical contact angle analysis technique. Contact angle analysis allows the estimation of surface wettability, surface free energy, surface charge, oleophobicity, contact angle hysteresis, and free energy of interaction; all coordinatively influence the membrane permeation and fouling properties. This review will provide insights into simplifying the evaluation of membrane properties by contact angle analysis that will ultimately expedite the membrane development process by reducing the time and expenses required for the characterization to confirm the success and the impact of any modification.
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Benefits of Residual Aluminum Oxide for Sand Blasting Titanium Dental Implants: Osseointegration and Bactericidal Effects. MATERIALS 2021; 15:ma15010178. [PMID: 35009326 PMCID: PMC8746027 DOI: 10.3390/ma15010178] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 12/22/2021] [Accepted: 12/23/2021] [Indexed: 12/17/2022]
Abstract
OBJECTIVES The purpose of this work was to determine the influence of residual alumina after sand blasting treatment in titanium dental implants. This paper studied the effect of alumina on physico-chemical surface properties, such as: surface wettability, surface energy. Osseointegration and bacteria adhesion were determined in order to determine the effect of the abrasive particles. MATERIALS AND METHODS Three surfaces were studied: (1) as-received, (2) rough surface with residual alumina from sand blasting on the surface and (3) with the same roughness but without residual alumina. Roughness was determined by white light interferometer microscopy. Surface wettability was evaluated with a contact angle video-based system and the surface free energy by means of Owens and Wendt equation. Scanning electron microscopy equipped with microanalysis was used to study the morphology and determine the chemical composition of the surfaces. Bacteria (Lactobacillus salivarius and Streptococcus sanguinis) were cultured in each surface. In total, 110 dental implants were placed into the bone of eight minipigs in order to compare the osseointegration. The percentage of bone-to-implant contact was determined after 4 and 6 weeks of implantation with histometric analysis. RESULTS The surfaces with residual alumina presented a lower surface free energy than clean surfaces. The in vivo studies demonstrated that the residual alumina accelerated bone tissue growth at different implantation times, in relation to clean dental implants. In addition, residual alumina showed a bactericidal effect by decreasing the quantity of bacteria adhering to the titanium. CONCLUSIONS It is possible to verify the benefits that the alumina (percentages around 8% in weight) produces on the surface of titanium dental implants. CLINICAL RELEVANCE Clinicians should be aware of the benefits of sand-blasted alumina due to the physico-chemical surface changes demonstrated in in vivo tests.
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12
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Poddighe M, Innocenzi P. Hydrophobic Thin Films from Sol-Gel Processing: A Critical Review. MATERIALS (BASEL, SWITZERLAND) 2021; 14:6799. [PMID: 34832200 PMCID: PMC8620172 DOI: 10.3390/ma14226799] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 11/07/2021] [Accepted: 11/08/2021] [Indexed: 11/17/2022]
Abstract
Fabrication of hydrophobic thin films from a liquid phase is a hot topic with critical technological issues. Interest in the production of hydrophobic surfaces is growing steadily due to their wide applications in several industrial fields. Thin films from liquid phases can be deposited on different types of surfaces using a wide variety of techniques, while the design of the precursor solution offers the possibility of fine-tuning the properties of the hydrophobic coating layers. A general trend is the design of multifunctional films, which have different properties besides being hydrophobic. In the present review, we have described the synthesis through sol-gel processing of hydrophobic films enlightening the main achievements obtained in the field.
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Affiliation(s)
| | - Plinio Innocenzi
- Laboratory of Materials Science and Nanotechnology (LMNT), Department of Biomedical Sciences, University of Sassari, CR-INSTM, Viale San Pietro, 07100 Sassari, Italy;
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Liu T, Tian R, Li Q, Wu N, Quan X. Strengthened attachment of anammox bacteria on iron-based modified carrier and its effects on anammox performance in integrated floating-film activated sludge (IFFAS) process. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 787:147679. [PMID: 34000539 DOI: 10.1016/j.scitotenv.2021.147679] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 05/05/2021] [Accepted: 05/06/2021] [Indexed: 06/12/2023]
Abstract
Moving-bed biofilm reactor (MBBR) or integrated floating-film activated sludge (IFFAS) process has been proved to be one of the ideal candidates for anammox application. However, the slow development of anammox bacteria (AnAOB) biofilm and unstable bioactivity always limit their wide application. This study developed a type of novel zero-valent iron (ZVI)-based modified carrier for strengthening AnAOB attachment and enhancing anammox performance. Surface properties analysis indicated the iron-based modified carrier revealed electropositive, less hydrophobic, and higher surface free energy compared with conventional high density polyethylene (HDPE) carrier. These surface parameters were positively correlated with total biomass attachment, anammox biofilm development, EPS secretion and heme-c production. IFFAS process filled with iron-based modified carriers could keep relatively stable and high anammox activity at different influent TN loadings (varied from 0.6 to 1.4 kg/(m3∙d)) and showed potential to keep and recover AnAOB bioactivity after six-months-freeze. Microbial analysis confirmed that anammox genus, Candidatus Kuenenia, had a significant niche preference on iron-based modified carrier than conventional HDPE carrier. As a result, the population of Candidatus Kuenenia in IFFAS process filled with modified carriers that contained 2 wt% or 3 wt% ZVI was 1.34 × 106-1.55 × 106 copies/ mg DNA, increased by 20.7-39.6% comparing with that in the control reactor (1.11 × 106 copies/ mg DNA). This study demonstrated AnAOB could be enriched and maintained in situ with high abundance and bioactivity on the iron-based modified carriers, which would be significant for anammox process wide application in full-scale.
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Affiliation(s)
- Tao Liu
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
| | - Ruiqi Tian
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Qian Li
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Nan Wu
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Xie Quan
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
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Dhall A, Islam S, Park M, Zhang Y, Kim A, Hwang G. Bimodal Nanocomposite Platform with Antibiofilm and Self-Powering Functionalities for Biomedical Applications. ACS APPLIED MATERIALS & INTERFACES 2021; 13:40379-40391. [PMID: 34406755 PMCID: PMC8548987 DOI: 10.1021/acsami.1c11791] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Advances in microelectronics and nanofabrication have led to the development of various implantable biomaterials. However, biofilm-associated infection on medical devices still remains a major hurdle that substantially undermines the clinical applicability and advancement of biomaterial systems. Given their attractive piezoelectric behavior, barium titanate (BTO)-based materials have also been used in biological applications. Despite its versatility, the feasibility of BTO-embedded biomaterials as anti-infectious implantable medical devices in the human body has not been explored yet. Here, the first demonstration of clinically viable BTO-nanocomposites is presented. It demonstrates potent antibiofilm properties against Streptococcus mutans without bactericidal effect while retaining their piezoelectric and mechanical behaviors. This antiadhesive effect led to ∼10-fold reduction in colony-forming units in vitro. To elucidate the underlying mechanism for this effect, data depicting unfavorable interaction energy profiles between BTO-nanocomposites and S. mutans using the classical and extended Derjaguin, Landau, Verwey, and Overbeek theories is presented. Direct cell-to-surface binding force data using atomic force microscopy also corroborate reduced adhesion between BTO-nanocomposites and S. mutans. Interestingly, the poling process on BTO-nanocomposites resulted in asymmetrical surface charge density on each side, which may help tackle two major issues in prosthetics-bacterial contamination and tissue integration. Finally, BTO-nanocomposites exhibit superior biocompatibility toward human gingival fibroblasts and keratinocytes. Overall, BTO-embedded composites exhibit broad-scale potential to be used in biological settings as energy-harvestable antibiofilm surfaces.
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Affiliation(s)
- Atul Dhall
- Department of Preventive and Restorative Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Sayemul Islam
- Department of Electrical and Computer Engineering, Temple University, Philadelphia, PA 19122, USA
| | - Moonchul Park
- Department of Electrical and Computer Engineering, Temple University, Philadelphia, PA 19122, USA
| | - Yu Zhang
- Department of Preventive and Restorative Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
- Center for Innovation & Precision Dentistry, School of Dental Medicine, School of Engineering and Applied Sciences, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Albert Kim
- Department of Electrical and Computer Engineering, Temple University, Philadelphia, PA 19122, USA
- Corresponding Authors: Geelsu Hwang, ; Albert Kim,
| | - Geelsu Hwang
- Department of Preventive and Restorative Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
- Center for Innovation & Precision Dentistry, School of Dental Medicine, School of Engineering and Applied Sciences, University of Pennsylvania, Philadelphia, PA 19104, USA
- Corresponding Authors: Geelsu Hwang, ; Albert Kim,
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15
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Tao W, Song Y, Singhal N, McGoverin C, Vanholsbeeck F, Swift S. A novel optical biosensor for in situ and small-scale monitoring of bacterial transport in saturated columns. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 289:112452. [PMID: 33813297 DOI: 10.1016/j.jenvman.2021.112452] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2020] [Revised: 03/05/2021] [Accepted: 03/17/2021] [Indexed: 06/12/2023]
Abstract
In situ monitoring techniques can provide new insight into bacterial transport after inoculating exogenous bacteria into contaminated soils for bioremediation. A real-time and non-destructive optical sensor (the optrode) was employed to monitor in situ transport of two fluorescently labelled bacteria - Green Fluorescent Protein (Gfp)-labelled, hydrophilic Pseudomonas putida and Tomato Fluorescent Protein (td)-labelled, hydrophobic Rhodococcus erythropolis, in a saturated sand column with and without rhamnolipid surfactant. In situ measurements were made at three sampling ports in the column with the optrode in two sets of column experiments. In Experiment 1, liquid samples were extracted for ex situ analyses (plate counts and fluorescence), while in Experiment 2 no liquid samples were extracted. Extracting liquid samples for ex situ analyses in Experiment 1 disturbed in situ measurements; in situ measured bacterial concentrations were lower, or a significant lag in breakthrough occurred relative to ex situ measurements. In Experiment 2, the optrode worked well in monitoring bacterial transport, which gave consistent transport parameters at each sampling port. Moreover, the optrode enabled the impact of bacterial hydrophobicity and rhamnolipid surfactant on bacterial transport to be observed. Specifically, hydrophilic P. putida was transported faster through the column than hydrophobic R. erythropolis; we infer from this result that fewer P. putida cells adsorb to sand particles than do R. erythropolis cells. The rhamnolipid surfactant enhanced the transport of both hydrophilic and hydrophobic bacteria. These two observations are consistent with Lifshitz-van der Waals forces and acid-base interactions between bacteria and sand.
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Affiliation(s)
- Wei Tao
- School of Chemistry and Environmental Engineering, Sichuan University of Science and Engineering, Zigong, 643000, PR China; Department of Civil and Environmental Engineering, The University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand.
| | - Yantao Song
- Department of Civil and Environmental Engineering, The University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand
| | - Naresh Singhal
- Department of Civil and Environmental Engineering, The University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand
| | - Cushla McGoverin
- The Dodds-Walls Centre for Photonic and Quantum Technologies, The University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand; Department of Physics, The University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand
| | - Frédérique Vanholsbeeck
- The Dodds-Walls Centre for Photonic and Quantum Technologies, The University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand; Department of Physics, The University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand
| | - Simon Swift
- Department of Molecular Medicine and Pathology, The University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand
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Yu W, Wan Y, Wang Y, Zhu Y, Tao S, Xu Q, Xiao K, Liang S, Liu B, Hou H, Hu J, Yang J. Enhancing waste activated sludge dewaterability by reducing interaction energy of sludge flocs. ENVIRONMENTAL RESEARCH 2021; 196:110328. [PMID: 33075357 DOI: 10.1016/j.envres.2020.110328] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Revised: 09/28/2020] [Accepted: 10/09/2020] [Indexed: 06/11/2023]
Abstract
How to efficiently improve waste activated sludge (WAS) dewaterability is a common challenge in WAS treatment and management throughout world. The interaction energy of sludge flocs is of great importance for sludge dewaterability. In this study, the relationship among the repulsive force of sludge flocs, hydrophilic/hydrophobic characteristics of sludge flocs, and sludge dewaterability have been quantitatively and qualitatively investigated based on extended Derjaguin-Landau-Verwey-Overbeek theory for the first time. The energy barrier of sludge flocs has good correlations with sludge dewaterability (p < 0.05). Trivalent cations (Al3+ and Fe3+) and Fenton's reagent reduced the interfacial free energy (ΔG) from 9.4 mJ/m2 of raw sludge to -34.2 (Al3+), -60.5 (Fe3+), and -63.2 (Fenton) mJ/m2, respectively, indicating that the hydrophilic surfaces of the sludge flocs converted to hydrophobic (△G < 0), and decreasing Lewis acid-base interaction energy (WAB) of sludge flocs. In addition, most of the trivalent cations (Al3+ and Fe3+) were attached to sludge flocs, leading to neutralize negative charges and mitigate electrostatic interaction energy (WR) of sludge flocs. The reduction of WAB and WR eliminated energy barrier of sludge flocs and repulsive force between sludge flocs. In comparison, monovalent (Na+ and K+) and bivalent (Ca2+ and Mn2+) cations cannot completely change the hydrophilic surface characteristic and negative charge of sludge flocs. The existed energy barrier prevented sludge flocs to agglomerate with each other, thus resulting in a worse dewaterability. This study illustrated that reducing interaction energy of sludge flocs played a critical role to improve sludge dewaterability.
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Affiliation(s)
- Wenbo Yu
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycle Technology, Wuhan, Hubei, 430074, China
| | - Yanlei Wan
- Changjiang Institute of Survey, Planning, Design and Research, Wuhan, Hubei, 430010, China
| | - Yu Wang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycle Technology, Wuhan, Hubei, 430074, China
| | - Yuwei Zhu
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycle Technology, Wuhan, Hubei, 430074, China
| | - Shuangyi Tao
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycle Technology, Wuhan, Hubei, 430074, China
| | - Qi Xu
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycle Technology, Wuhan, Hubei, 430074, China; Changjiang Institute of Survey, Planning, Design and Research, Wuhan, Hubei, 430010, China
| | - Keke Xiao
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycle Technology, Wuhan, Hubei, 430074, China
| | - Sha Liang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycle Technology, Wuhan, Hubei, 430074, China
| | - Bingchuan Liu
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycle Technology, Wuhan, Hubei, 430074, China
| | - Huijie Hou
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycle Technology, Wuhan, Hubei, 430074, China.
| | - Jingping Hu
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycle Technology, Wuhan, Hubei, 430074, China
| | - Jiakuan Yang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycle Technology, Wuhan, Hubei, 430074, China; State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China.
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17
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Yelemane V, Kangwa M, Dsouza RN, Fernández-Lahore M. Surface energetics to assess influence of biomass-type and biomass-adsorbent interactions in expanded beds. BIORESOUR BIOPROCESS 2021; 8:29. [PMID: 38650215 PMCID: PMC10991939 DOI: 10.1186/s40643-021-00382-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2020] [Accepted: 04/09/2021] [Indexed: 11/10/2022] Open
Abstract
In integrated bioprocessing applications, expanded bed adsorption (EBA) chromatography presents an opportunity to harvest biomolecules directly from the crude feedstock. However, unfavorable biomass interactions with adsorbent usually leads to fouling, which reduces its protein binding capacity as it alters column hydrodynamics and binding site availability. In this work, a detailed study on biomass adhesion behavior of four different industrially relevant microorganisms on 26 different, most commonly occurring adsorbent surfaces with varying degrees of surface energy and surface charge has been conducted. The results showed the derivation of a relative "stickiness" factor for every microorganism, which further classifies each organism based on their general degree of adhesion to surfaces with respect to one another. The obtained results can help to better understand the effect of biomass homogenization on biomass-adsorbent interactions in EBA. The data of surface energy and charge for the surfaces investigated in this work can be used to calculate the stickiness factor of other microorganisms of interest and may assist in the development of novel adsorbent materials for EBA chromatography.
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Affiliation(s)
- Vikas Yelemane
- Downstream Bioprocessing Laboratory, School of Engineering and Science, Jacobs University, Campus Ring 1, 28759, Bremen, Germany
| | - Martin Kangwa
- Downstream Bioprocessing Laboratory, School of Engineering and Science, Jacobs University, Campus Ring 1, 28759, Bremen, Germany
| | - Roy N Dsouza
- Downstream Bioprocessing Laboratory, School of Engineering and Science, Jacobs University, Campus Ring 1, 28759, Bremen, Germany
| | - Marcelo Fernández-Lahore
- Downstream Bioprocessing Laboratory, School of Engineering and Science, Jacobs University, Campus Ring 1, 28759, Bremen, Germany.
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18
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Gao Z, Wang C, Sun W, Gao Y, Kowalczuk PB. Froth flotation of fluorite: A review. Adv Colloid Interface Sci 2021; 290:102382. [PMID: 33676242 DOI: 10.1016/j.cis.2021.102382] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 02/09/2021] [Accepted: 02/09/2021] [Indexed: 10/22/2022]
Abstract
Fluorite, as a scarce nonrenewable strategic non-metallic mineral resource, is the primary raw material for fluorine products used in diverse fields such as metallurgy, national defense, chemical and optical industries. With the increasing expansion of the related fields, the demand for high-quality fluorite continues to grow. Hence, the surge of interest in effectively utilizing fluorite resources has led to vast attention worldwide. So far, significant endeavors have been done to enhance the beneficiation of fluorite from relatively low-grade ores. It has been well appreciated that the froth flotation is of the most importance. However, to the best of the authors' knowledge, it lacks a thorough and critical review on the recent developments in fluorite flotation. This article begins with introducing the deposits and unique physical and chemical properties of fluorite from the perspective of the crystal structure. It is followed by a systematic review of common reagents involved in fluorite flotation, including collectors, depressants, regulators, modifiers, and frothers. Specifically, the synergistic effect of collectors and depressants on the recovery of fluorite is elaborated for the first time. Finally, the most widely seen fluorite-flotation cases, including separation of fluorite from quartz, calcite, barite, and sulfide, are summarized individually. The present review sheds new light on the deep understanding of fluorite flotation, the future synthesis of reagents, as well as their schemes in practical use. Meanwhile, such a novel rain of thought provided in this work has the potential to guide the flotation of other similar minerals extensively.
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19
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Chang H, Liu B, Zhang Z, Pawar R, Yan Z, Crittenden JC, Vidic RD. A Critical Review of Membrane Wettability in Membrane Distillation from the Perspective of Interfacial Interactions. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:1395-1418. [PMID: 33314911 DOI: 10.1021/acs.est.0c05454] [Citation(s) in RCA: 56] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Hydrophobic membranes used in membrane distillation (MD) systems are often subject to wetting during long-term operation. Thus, it is of great importance to fully understand factors that influence the wettability of hydrophobic membranes and their impact on the overall separation efficiency that can be achieved in MD systems. This Critical Review summarizes both fundamental and applied aspects of membrane wetting with particular emphasis on interfacial interaction between the membrane and solutes in the feed solution. First, the theoretical background of surface wetting, including the relationship between wettability and interfacial interaction, definition and measurement of contact angle, surface tension, surface free energy, adhesion force, and liquid entry pressure, is described. Second, the nature of wettability, membrane wetting mechanisms, influence of membrane properties, feed characteristics and operating conditions on membrane wetting, and evolution of membrane wetting are reviewed in the context of an MD process. Third, specific membrane features that increase resistance to wetting (e.g., superhydrophobic, omniphobic, and Janus membranes) are discussed briefly followed by the comparison of various cleaning approaches to restore membrane hydrophobicity. Finally, challenges with the prevention of membrane wetting are summarized, and future work is proposed to improve the use of MD technology in a variety of applications.
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Affiliation(s)
- Haiqing Chang
- Key Laboratory of Deep Earth Science and Engineering (Ministry of Education), College of Architecture and Environment, Sichuan University, Chengdu 610207, China
- Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Baicang Liu
- Key Laboratory of Deep Earth Science and Engineering (Ministry of Education), College of Architecture and Environment, Sichuan University, Chengdu 610207, China
| | - Zhewei Zhang
- Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Ritesh Pawar
- Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Zhongsen Yan
- College of Civil Engineering, Fuzhou University, Fujian, 350116, China
| | - John C Crittenden
- Brook Byers Institute for Sustainable Systems, School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Radisav D Vidic
- Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
- Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
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20
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Yuan H, Wang Y, Lai Z, Zhang X, Jiang Z, Zhang X. Analyzing microalgal biofilm structures formed under different light conditions by evaluating cell-cell interactions. J Colloid Interface Sci 2021; 583:563-570. [PMID: 33039857 DOI: 10.1016/j.jcis.2020.09.057] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 09/07/2020] [Accepted: 09/15/2020] [Indexed: 11/17/2022]
Abstract
Biofilm structure plays an important role in microalgae biofilm-based culture. This work aims to understand microalgal biofilm structures formed under different light conditions. Here, Scenedesmus obliquus was biofilm cultured under the light spectra of white, blue, green, and red, and the photoperiods of 5:5 s, 30:30 min, and 12:12 h (light : dark period). Biofilms were observed with confocal laser scanning microscopes and profilometry, then the porosity and roughness of biofilm were determined. We found that cells under white light formed a heterogeneous biofilm with many voids, high porosity, and roughness. While under red and blue lights, cells formed homogeneous biofilms with low porosity. Biofilm structures formed under different photoperiods were different. The mechanism of forming different biofilm structures under different light conditions was interpreted from the aspect of cell-cell interactions. Moreover, the results revealed that biomass accumulation increased with the increasing biofilm porosity due to the high effective diffusion coefficient.
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Affiliation(s)
- Hao Yuan
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Yi Wang
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Zhijian Lai
- School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Xinru Zhang
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Engineering Research Center of Energy Saving and Environmental Protection, Beijing 100083, China.
| | - Zeyi Jiang
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Key Laboratory for Energy Saving and Emission Reduction of Metallurgical Industry, Beijing 100083, China
| | - Xinxin Zhang
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Key Laboratory for Energy Saving and Emission Reduction of Metallurgical Industry, Beijing 100083, China
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21
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Direct Fluorination as Method of Improvement of Operational Properties of Polymeric Materials. Polymers (Basel) 2020; 12:polym12122836. [PMID: 33260515 PMCID: PMC7760139 DOI: 10.3390/polym12122836] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Revised: 11/24/2020] [Accepted: 11/24/2020] [Indexed: 11/17/2022] Open
Abstract
Direct fluorination of polymers is a widely utilized technique for chemical modification. Such introduction of fluorine into the chemical structure of polymeric materials leads to laminates with highly fluorinated surface layer. The physicochemical properties of this layer are similar to those of perfluorinated polymers that differ by a unique combination of chemical resistance, weak adhesion, low cohesion, and permittivity, often barrier properties, etc. Surface modification by elemental fluorine allows one to avoid laborious synthesis of perfluoropolymers and impart such properties to industrial polymeric materials. The current review is devoted to a detailed consideration of wetting by water, energy characteristics of surfaces, adhesion, mechanical and electrical properties of the polymers, and composites after the direct fluorination.
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22
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Influence of different ceramic materials and surface treatments on the adhesion of Prevotella intermedia. J Mech Behav Biomed Mater 2020; 111:104010. [PMID: 32750671 DOI: 10.1016/j.jmbbm.2020.104010] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 07/17/2020] [Accepted: 07/20/2020] [Indexed: 12/17/2022]
Abstract
Ceramics are used in oral rehabilitation; however, these materials are prone to formation of biofilms that may cause periodontal diseases. This study aimed to evaluate the influence of distinct surface treatments on ceramic surface roughness and biofilm formation of oral bacteria (Prevotella intermedia). Eighty-four specimens of the following four ceramic systems were produced: LC - leucite-based glass ceramic, LD - lithium disilicate-based glass ceramic, LSZ - glass ceramic based on zirconia-reinforced lithium silicate, and ZR - monolithic zirconia. These were submitted to three different surface treatment protocols: C - control, G - glazing, and GDB - grinding with diamond bur (n = 7). The surface characteristics were assessed using a confocal laser microscope (Ra) and a scanning electron microscope (SEM). Thereafter, the groups were contaminated with a bacterial strain of P. intermedia ATCC 25611. The biofilms formed were quantified by counting the colony forming units (CFUs) and analyzed with scanning electron microscope (SEM) and confocal laser scanning microscope (CLSM). Data were analyzed by using a 2-way ANOVA and the Tukey test (ɑ = 0.05). Results showed that greater roughness was associated with GDB (p < 0.05). The same was also true for the ceramic material ZR (p < 0.05). There was a statistical significant difference in the CFU counts between the materials (p < 0.05) that revealed a greater amount of bacterial adhesion in the LC and ZR groups (p > 0.05). Thus, it was suggested that the surface roughness of the ceramic materials favored bacterial adhesion; and thus, finishing of ceramic surfaces with GDB should be avoided.
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23
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Nikoo AH, Malayeri MR. Incorporation of surface energy properties into general crystallization fouling model for heat transfer surfaces. Chem Eng Sci 2020. [DOI: 10.1016/j.ces.2019.115461] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Nikoo AH, Kalantariasl A, Malayeri MR. Propensity of gypsum precipitation using surface energy approach. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.112320] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Abstract
Bacteria activation and cloud condensation nuclei (CCN) formation have been studied in the atmosphere using the classical theory of heterogeneous nucleation. Simulations were performed for the binary system of sulfuric acid/water using laboratory-determined contact angles. Realistic model simulations were performed at different atmospheric heights for a set of 140 different bacteria. Model simulations showed that bacteria activation is a potentially favorable process in the atmosphere which may be enhanced at lower temperatures. CCN formation from bacteria nuclei is dependent on ambient atmospheric conditions (temperature, relative humidity), bacteria size, and sulfuric acid concentration. Furthermore, a critical parameter for the determination of bacteria activation is the value of the intermolecular potential between the bacteria’s surface and the critical cluster formed at their surface. In the classical nucleation theory, this is parameterized with the contact angle between substrate and critical cluster. Therefore, the dataset of laboratory values for the contact angle of water on different bacteria substrates needs to be enriched for realistic simulations of bacteria activation in the atmosphere.
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Scalabrini M, Hamon J, Linossier I, Ferrières V, Réhel K. Pseudomonas aeruginosa resistance of monosaccharide-functionalized glass surfaces. Colloids Surf B Biointerfaces 2019; 183:110383. [DOI: 10.1016/j.colsurfb.2019.110383] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 07/16/2019] [Accepted: 07/19/2019] [Indexed: 01/10/2023]
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27
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Experimental adhesion of Geobacillus stearothermophilus and Anoxybacillus flavithermus to stainless steel compared with predictions from interaction models. CHEMICAL PAPERS 2019. [DOI: 10.1007/s11696-019-00880-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Yuan H, Zhang X, Jiang Z, Wang X, Chen X, Cao L, Zhang X. Analyzing the effect of pH on microalgae adhesion by identifying the dominant interaction between cell and surface. Colloids Surf B Biointerfaces 2019; 177:479-486. [PMID: 30807962 DOI: 10.1016/j.colsurfb.2019.02.023] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2018] [Revised: 02/03/2019] [Accepted: 02/11/2019] [Indexed: 11/25/2022]
Abstract
Microalgae adhesion plays a critical role in developing effective photobioreactors for large-scale production of microalgae biofuel. This study focused on elucidating the influencing mechanism of liquid medium pH on microalgae adhesion by identifying the dominant interactions between cell and substratum using a criterion. Herein, the adhesion of three microalgae onto two substrata at a series of pH was observed using a flow chamber. The results indicated that the adhesion of freshwater Chlorella sp. onto PVC and glass and marine Chlorella sp. and N. oculata onto glass decreased with increasing pH, because these adhesions were dominated by the EL interaction, and the pH would influence the adhesion primarily by affecting the ζ potential of the cell and substratum. Whereas, the adhesion of marine Chlorella sp. and N. oculata onto PVC increased with increasing pH, because these adhesions were dominated by Lewis acid-base (AB) interaction, and the pH would influence the adhesion primarily by affecting the components of surface free energy of cell. The study demonstrated that the influencing mechanism of pH on adhesion can be conclusively elucidated by identifying the dominant interaction between the cell and the surface, and may have significant implications for predicting cell adhesion in various applications.
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Affiliation(s)
- Hao Yuan
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Xinru Zhang
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China; Beijing Engineering Research Center of Energy Saving and Environmental Protection, University of Science and Technology Beijing, Beijing, 100083, China.
| | - Zeyi Jiang
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China; Beijing Key Laboratory for Energy Saving and Emission Reduction of Metallurgical Industry, University of Science and Technology Beijing, Beijing, 100083, China
| | - Xinyu Wang
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Xuehui Chen
- School of Mathematics and Physics, University of Science and Technology Beijing, Beijing, 100083, China
| | - Limei Cao
- School of Mathematics and Physics, University of Science and Technology Beijing, Beijing, 100083, China
| | - Xinxin Zhang
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China; Beijing Key Laboratory for Energy Saving and Emission Reduction of Metallurgical Industry, University of Science and Technology Beijing, Beijing, 100083, China
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Aasim M, Khan MH, Rahman IU, Bibi NS, Ali W, Khan NZ, Khan AA. Comparative analysis of the methods used for finding surface energy to investigate protein interaction behavior on chromatographic supports. Biotechnol Prog 2019; 35:e2828. [PMID: 31025822 DOI: 10.1002/btpr.2828] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2019] [Revised: 03/26/2019] [Accepted: 04/17/2019] [Indexed: 11/09/2022]
Abstract
Hydrophobic interaction chromatography, an important and effective purification strategy, is generally used for the purification of variety of biomolecules. A basic understanding of the protein interaction behavior is required to effectively separate these biomolecules. A colloidal type extended Derjaguin, Landau, Verwey, and Overbeek calculations were utilized to study the interactions behavior of model proteins to commercially available hydrophobic chromatographic materials that is, Toyopearl Phenyl 650C and Toyopearl Butyl 650C. Physicochemical properties of selected model proteins were achieved by contact angle and zeta potential measurements. The contact angle of chromatographic materials used was achieved through sessile drop method on disrupted beads and capillary penetration method (CPM) on intact beads. The surface properties were further used to calculate the interactions of the proteins to chromatographic supports. The calculated secondary energy minimum of the proteins with the chromatographic materials (from the contact angle values determined through both methods can be correlated with the retention volumes from the real chromatography. The secondary energy minimum values are higher for each protein to the chromatographic materials calculated from the inputs derived through sessile drop method compared to CPM. For instance, immunoglobulin G has secondary energy minimum value of 0.17 kT compared to 0.11 kT, obtained through sessile drop method and CPM, respectively. Average relative values of the energy minimum calculated for all proteins are as 1.51 kT and 1.29 kT for Toyopearl Butyl 650C and Toyopearl Phenyl 650C, respectively, as a conversion factor for estimation of secondary energy minimum for both methods.
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Affiliation(s)
- Muhammad Aasim
- Department of Biotechnology, University of Malakand, Lower Dir, Khyber Pakhtunkhwa, Pakistan
| | - Muhammad H Khan
- Hefei National Laboratory for Physical Sciences at Microscale, School of Life Sciences, University of Science and Technology of China, Hefei, Anhui, China
| | - Inam U Rahman
- Fuli Institute of Food Science, College of Biosystems Engineering and Food Science, Zhejiang Key Laboratory for Agro-Food Processing, Zhejiang University, Hangzhou, China
| | - Noor Shad Bibi
- Department of Biochemistry, Abdul Wali Khan University Mardan, Mardan, Khyber Pakhtunkhwa, Pakistan
| | - Waqar Ali
- Department of Biotechnology, University of Malakand, Lower Dir, Khyber Pakhtunkhwa, Pakistan
| | - Nadir Z Khan
- Department of Biotechnology, University of Malakand, Lower Dir, Khyber Pakhtunkhwa, Pakistan
| | - Abid A Khan
- Department of Biosciences, COMSATS Institute of information Technology, Islamabad, Pakistan
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Yuan H, Zhang X, Jiang Z, Chen X, Zhang X. Quantitative Criterion to Predict Cell Adhesion by Identifying Dominant Interaction between Microorganisms and Abiotic Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:3524-3533. [PMID: 30580526 DOI: 10.1021/acs.langmuir.8b03465] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Cell adhesion is ubiquitous and plays an important role in various scientific and engineering problems. Herein, a quantitative criterion to predict cell adhesion was proposed by identifying the dominant interaction between microorganisms and abiotic surfaces. According to the criterion, the dominant interaction in cell adhesion could be identified as a Lewis acid-base (AB) interaction or electrostatic (EL) interaction via comparison of two expressions containing the electron-donor characteristics of the microorganism (γmv-) and abiotic surface (γsv-) and their ζ potentials (ζm, ζs). The results revealed that when dominated by the AB interaction, adhesion would decrease with increasing [Formula: see text]. However, when the EL interaction was dominant, adhesion would decrease with increasing (ζm + ζs)2. We have verified the criterion based on the adhesion of microalgae, bacteria, and fungi onto various surfaces obtained via our experiments and available in literature studies. The results demonstrated that the criterion had important implications in the prediction of cell adhesion in various applications.
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Stammitti-Scarpone A, Acosta EJ. Solid-liquid-liquid wettability and its prediction with surface free energy models. Adv Colloid Interface Sci 2019; 264:28-46. [PMID: 30396508 DOI: 10.1016/j.cis.2018.10.003] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Revised: 10/09/2018] [Accepted: 10/22/2018] [Indexed: 12/23/2022]
Abstract
Understanding wettability in solid-liquid-liquid (SLL or immersed) systems is important for numerous applications. However, predicting SLL wetting behavior on smooth surfaces has received little attention. The objective of this work was to explore alternatives to predict SLL wettability. To this end, we first present a review of solid surface free energy (σS) data obtained from solid-liquid-air (SLA) contact angle (θLa) data and a summary of available SLL contact angle data for selected materials. Next, the existing surface free energy models for SLA systems are discussed in terms of their applicability to predict wettability of SLL systems. Finally, the SLL wettability of toluene drops on glass, mica, stainless steel and PTFE immersed in equilibrated Toluene-water-isopropyl alcohol (IPA) solutions was determined via contact angle (θO) measurements through the oil phase using the inverted sessile drop method over a wide range of interfacial tensions (γo-aq). The results were plotted as γo-aq·cosθO vs. γo-aq, showing a smooth wetting transition from water-wetting to oil-wetting with decreasing γo-aq for glass and stainless steel. Mica remained water-wetting, while PTFE oil-wetting. The Geometric (GM) and Harmonic (HM) mean approaches, and the Equation-of-State (EQS), originally developed for SLA systems, were extended to SLL systems. The extended GM and HM approaches could fit the SLL behavior after fitting the dispersive and polar contributions of the solid surface free energy (σSd, σSp), which required additional SLA θLa measurements using PTFE as the reference surface. However, attempts at predicting θO for systems with high γo-aq resulted in significant deviations, a problem linked to the high σSd values required to fit the wettability of low γo-aq systems (toluene-water-IPA). The extended EQS (e-EQS) method produced reasonable predictions of γo-aq·cosθO for all the available experimental and literature data. The e-EQS method required fitting one of the interfacial energy terms (γS-L). For low surface energy materials, such as PTFE, the γS-o value should be fitted. For high surface energy materials, the γS-aq should be fitted instead. The fitted values of γS-o for PTFE and γS-aq for glass were consistent with the values obtained from Young's equation applied to SLA data.
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Affiliation(s)
| | - E J Acosta
- Dept. Chemical Engineering and Applied Chemistry, University of Toronto, Canada.
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Strejc J, Kyselova L, Cadkova A, Potocar T, Branyik T. Physico-chemical approach to adhesion of Alicyclobacillus cells and spores to model solid materials. Extremophiles 2019; 23:219-227. [DOI: 10.1007/s00792-019-01075-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Accepted: 01/04/2019] [Indexed: 11/30/2022]
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Nandakumar V, Huang C, Pulgar A, Balasubramanian V, Wu G, Chandar P, Moudgil BM. Particle assisted removal of microbes from surfaces. J Colloid Interface Sci 2019; 533:190-197. [PMID: 30165296 DOI: 10.1016/j.jcis.2018.08.043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 08/11/2018] [Accepted: 08/14/2018] [Indexed: 10/28/2022]
Abstract
Increased reliance on kill based approaches for disinfection raises concerns of antimicrobial resistance development and has significantly elevated the need for alternate approaches for skin and substrate disinfection. This study focuses on reducing harmful microbes from substrates primarily via removal and to a lesser extent by kill. HYPOTHESIS Functional micro-particles designed to adhere to microbes, with a force greater than the force of microbial adhesion to the substrate, would result in enhanced removal-based disinfection of substrates when subject to an external force. EXPERIMENTS Silica particles were functionalized with a cationic polymer to bind strongly with bacteria via Coulombic interactions. Disinfection efficacies of substrates with functional particles and control groups were evaluated under conditions relevant for handwashing. FINDINGS Functionalized silica micro-particles result in ∼4 log reduction of E. coli from an artificial skin substrate in 30 s as compared to a maximum of 1.5 log reduction with control particles. Bacterial viability assays indicate a mechanism of action driven by enhanced removal of bacteria with minimal kill. Particle number density, size and suspension velocity along with strong particle - bacteria interactions have been found to be the primary factors responsible for the enhanced bacterial removal from surfaces.
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Affiliation(s)
- Vignesh Nandakumar
- Department of Materials Science and Engineering, University of Florida, FL 32611, USA; Center for Particulate and Surfactant Systems, University of Florida, FL 32611, USA
| | - Chenan Huang
- Department of Biomedical Engineering, University of Florida, FL 32611, USA
| | - Andrea Pulgar
- Department of Chemical Engineering, University of Florida, FL 32611, USA
| | - Vasanthakumar Balasubramanian
- Department of Materials Science and Engineering, University of Florida, FL 32611, USA; Center for Particulate and Surfactant Systems, University of Florida, FL 32611, USA
| | - Guohui Wu
- Unilever Research and Development, Trumbull, CT 06611, USA
| | - Prem Chandar
- Unilever Research and Development, Trumbull, CT 06611, USA
| | - Brij M Moudgil
- Department of Materials Science and Engineering, University of Florida, FL 32611, USA; Center for Particulate and Surfactant Systems, University of Florida, FL 32611, USA.
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Zhang Z, Adedeji I, Chen G, Tang Y. Chemical-Free Recovery of Elemental Selenium from Selenate-Contaminated Water by a System Combining a Biological Reactor, a Bacterium-Nanoparticle Separator, and a Tangential Flow Filter. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:13231-13238. [PMID: 30335990 DOI: 10.1021/acs.est.8b04544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Biological selenate (SeO42-) reduction to elemental selenium nanoparticles (SeNPs) has been intensively studied but little practiced because of the additional cost associated with separation of SeNPs from water. Recovery of the SeNPs as a valuable resource has been researched to make the approach more competitive. Separation of the intracellular SeNPs from the biomass usually requires the addition of chemicals. In this research, a novel approach that combined a biological reactor, a bacterium-SeNP separator, and a tangential flow ultrafiltration module (TFU) was investigated to biologically reduce selenate and separate the SeNPs, biomass, and water from each other. This approach efficiently removed and recovered selenium while eliminating the use of chemicals for separation. The three units in the approach worked in synergism to achieve the separation and recovery. The TFU module retained the biomass in the system, which increased the biomass retention time and allowed for more biomass decay through which intracellular SeNPs could be released and recovered. SeNP aggregates were separated from bacterial aggregates due to their different interactions with a tilted polyethylene sheet in the bacterium-SeNP separator. SeNP aggregates stayed on the polyethylene sheet while bacterial aggregates settled down to the bottom of the separator.
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Affiliation(s)
- Zhiming Zhang
- Department of Civil and Environmental Engineering, FAMU-FSU College of Engineering , Florida State University , 2525 Pottsdamer Street , Tallahassee , Florida 32310 , United States
| | - Itunu Adedeji
- Department of Civil and Environmental Engineering, FAMU-FSU College of Engineering , Florida State University , 2525 Pottsdamer Street , Tallahassee , Florida 32310 , United States
| | - Gang Chen
- Department of Civil and Environmental Engineering, FAMU-FSU College of Engineering , Florida State University , 2525 Pottsdamer Street , Tallahassee , Florida 32310 , United States
| | - Youneng Tang
- Department of Civil and Environmental Engineering, FAMU-FSU College of Engineering , Florida State University , 2525 Pottsdamer Street , Tallahassee , Florida 32310 , United States
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35
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Contreras LPC, Dal Piva AMO, Ribeiro FC, Anami LC, Camargo SEA, Jorge AOC, Bottino MA. Effects of Manufacturing and Finishing Techniques of Feldspathic Ceramics on Surface Topography, Biofilm Formation, and Cell Viability for Human Gingival Fibroblasts. Oper Dent 2018; 43:593-601. [DOI: 10.2341/17-126-l] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
SUMMARY
Purpose:
Feldspathic ceramic restorations can be obtained by different techniques (stratification or computer-aided design/computer-aided manufacturing [CAD/CAM] blocks) and finishing procedures (polishing or glaze application). This study evaluated the effects of techniques and finishing procedures on surface properties, biofilm formation, and viability of human gingival fibroblasts (FMM-1) in contact with these materials.
Methods and Materials:
Ceramic specimens were obtained through a stratification technique (Vita VM9) and from CAD/CAM blocks (Vita Blocs Mark II; both Vita Zahnfabrik) and their surfaces were finished by polishing (ceramisté diamond rubbers + polishing paste; “p” subgroups) or glaze spray application + sintering (“g” subgroups). Roughness (Ra and RSm parameters) and surface free energy (SFE) were measured. Early biofilm formation of Streptococcus mutans, Streptococcus sanguinis, and Candida albicans was evaluated by counting colony-forming units (CFU). MTT (3-[4.5-dimethyl-thiazol-2-yl-]-2.5-diphenyl tetrazolium bromide) cytotoxicity test evaluated cellular viability for the growth of FMM-1 after 24 hours and seven days of contact. Scanning electron microscopy (SEM) and three-dimensional optical profilometry were performed to qualitatively analyze the surface. Data were analyzed by analysis of variance, Tukey test, and t-test (all α=0.05).
Results:
Polished samples presented lower roughness (Ra, p=0.015; RSm, p=0.049) and higher SFE (p=0.00). Streptococci had higher CFU in all groups, but the CFU of C albicans was lower for polished samples. Biofilm formation was influenced by the interaction of all factors (p=0.018), and the materials showed no cytotoxicity to FMM-1 growth.
Conclusions:
Polishing resulted in the lowest values for surface roughness and higher SFE values. Polished ceramics showed less C albicans adherence while the adherence of Streptococci was greater than C albicans in all conditions.
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Affiliation(s)
- LPC Contreras
- Lisseth Patricia Claudio Contreras, DDS, MSc, Institute of Science and Technology, São Paulo State University–Unesp, Department of Dental Materials and Prosthodontics, São José dos Campos, Brazil
| | - AMO Dal Piva
- Amanda Maria Oliveira Dal Piva, DDS, MSc, Department of Dental Materials and Prosthodontics, São Paulo State University–Unesp, Department of Dental Materials and Prosthodontics, São José dos Campos, Brazil
| | - FC Ribeiro
- Felipe de Camargo Ribeiro, MSc, Institute of Science and Technology, São Paulo State University–Unesp, Department of Biosciences and Oral Diagnosis, São José dos Campos, Brazil
| | - LC Anami
- Lilian Costa Anami, DDS, MSc, PhD, Universidade Santo Amaro, Department of Dentistry, São Paulo, Brazil
| | - SEA Camargo
- Felipe de Camargo Ribeiro, MSc, Institute of Science and Technology, São Paulo State University–Unesp, Department of Biosciences and Oral Diagnosis, São José dos Campos, Brazil
| | - AOC Jorge
- Antonio Olavo Cardoso Jorge, DDS, MSc, PhD, Institute of Science and Technology, São Paulo State University–Unesp, Department of Biosciences and Oral Diagnosis, São José dos Campos, Brazil
| | - MA Bottino
- Marco Antonio Bottino, DDS, MSc, PhD, Institute of Science and Technology, São Paulo State University–Unesp, Department of Dental Materials and Prosthodontics, São José dos Campos, Brazil
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36
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Khosa M, Ullah A. Mechanistic insight into protein supported biosorption complemented by kinetic and thermodynamics perspectives. Adv Colloid Interface Sci 2018; 261:28-40. [PMID: 30301519 DOI: 10.1016/j.cis.2018.09.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Revised: 09/17/2018] [Accepted: 09/25/2018] [Indexed: 10/28/2022]
Abstract
In this review, we discussed the micro-level aspects of protein supported biosorption. The mechanism, surface chemistry in terms of energy interactions and electron transfer process (ETP) of peptide systems within protein are three important areas that provide mechanistic insight into protein supported biosorption. The functional groups in proteinous material like hydroxyl (-OH), carbonyl (>C=O), carboxyl (-COOH) and sulfhydryl (-SH) play a significant role in the biosorption of variety of pollutants such as metal ions, metalloids, and organic matters in wastewaters. The mechanistic aspects of biosorption are crucial not only for the separation process but also they contribute towards stoichiometric considerations and mathematical modelling process. The surface chemistry of applied biosorbents relies on interfacial components whose interaction energies are estimated with help of classical Derjaguin, Landau, Verwey, and Overbeek (DLVO) theory mathematically. Proteins are the fundamental molecules of many biomaterial used for the biosorption of contaminents and peptide bond is considered as the backbone of proteins. The charge variations on peptide bonding is the result of ETP whose discussion was made part of this review for understaning number of biological and technological processes of vital interests. In addition, this review was complemented by exhaustive overview of kinetic and thermodynamics perspectives of biosorption process.
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Sasaki Y, Minamiki T, Minami T. Development of Supramolecular Sensor Devices Based on Organic Transistors. J SYN ORG CHEM JPN 2018. [DOI: 10.5059/yukigoseikyokaishi.76.1086] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yui Sasaki
- Institute of Industrial Science, The University of Tokyo
| | - Tsukuru Minamiki
- Institute of Industrial Science, The University of Tokyo
- National Institute of Advanced Industrial Science and Technology
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Ye Z, Kim A, Mottley CY, Ellis MW, Wall C, Esker AR, Nain AS, Behkam B. Design of Nanofiber Coatings for Mitigation of Microbial Adhesion: Modeling and Application to Medical Catheters. ACS APPLIED MATERIALS & INTERFACES 2018; 10:15477-15486. [PMID: 29637776 DOI: 10.1021/acsami.8b02907] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Surface-associated microbial communities, known as biofilms, pose significant challenges in clinical and industrial settings. Micro-/nanoscale substratum surface features have been shown to disrupt firm adhesion of planktonic microbes to surfaces, thereby interfering with the earliest stage of biofilm formation. However, the role of geometry and size of surface features in microbial retention is not completely understood. In this study, we developed a biophysical model that describes the changes in the total free energy (adhesion energy and stretching energy) of an adherent Candida albicans cell on nanofiber-coated surfaces as a function of the geometry (i.e., diameter) and configuration (i.e., interfiber spacing) of the surface features (i.e., nanofibers). We then introduced a new nondimensional parameter, Π, to represent the ratio of cell rigidity to cell-substratum interfacial energy. We show that the total free energy is a strong function of topographical feature size at higher Π and lower spacing values. To confirm our biophysical model predictions, we performed 24 h dynamic retention assays and quantified cell attachment number density on surfaces coated with highly ordered polystyrene nanofibers. We show that the total free energy of a single adherent cell on a patterned surface is a key determinant of microbial retention on that surface. The cell attachment density trend closely correlates with the predictions based on the adherent single-cell total energy. The nanofiber coating design (1.2 μm diameter, 2 μm spacing) that maximized the total energy of the adherent cell resulted in the lowest microbial retention. We further demonstrate the utility of our biophysical model by showing close correlation between the computed single-cell total free energy and biofilm nucleation on fiber-coated urinary and central venous catheters of different materials. This biophysical model could offer a powerful new paradigm in ab initio design of patterned surfaces for controlled biofilm growth for medical applications and beyond.
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Aasim M, Hidayatullah Khan M, Bibi NS, Zaman Khan N. Protein adsorption onto monoliths: A surface energetics study. Eng Life Sci 2017; 18:179-186. [PMID: 32624896 DOI: 10.1002/elsc.201700097] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 10/26/2017] [Accepted: 11/02/2017] [Indexed: 11/11/2022] Open
Abstract
This part of work was done to explore the basic understanding of the adsorption chromatography by determining the interaction of selected model proteins (n = 5) to monolithic chromatographic materials, with varying densities of butyl and phenyl ligands. Surface energetics approach was applied to study the interaction behavior. The physicochemical properties of the proteins and monolithic chromatographic materials were explored by contact angle and zeta potential values. These values were used to study protein to monolith interaction under various operating conditions. Surface energetics approach allowed the calculation of interaction energy as a function of distance, i.e. energy minimum values. Calculations were performed at various conditions to analyze the effect of major operating parameters on the interaction strength. The interaction strength exposed the hydrophobic nature of the monoliths which increases with increasing ligand density. Further, interaction energy of proteins were higher with monolith with butyl ligand compared to monolith with phenyl ligand. For instance, lactoferrin interaction to monoliths with butyl represents more interaction, i.e. 24.38 kT as compared to monoliths with phenyl i.e. 23.28 kT, keeping lambda as 0.2 nm and salt concentration as 100 mM of ammonium sulphate. Hence, more energy and time will be consumed for elution of proteins immobilized to monoliths with butyl. Similarly, the effect of solid surface for proteins immobilization, effect of ligand density and effect of lambda showed some interesting insights on the interaction behavior. The knowledge generated from the present work will help in the basic understanding as well as development of an efficient, low cost downstream processing design and may mimic the real chromatographic experiments.
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Affiliation(s)
- Muhammad Aasim
- Department of Biotechnology University of Malakand Chakdara Dir (Lower) Pakistan
| | - Muhammad Hidayatullah Khan
- Department of Biotechnology University of Malakand Chakdara Dir (Lower) Pakistan.,School of Life Sciences University of Science and Technology of China Hefei Anhui P. R. China
| | - Noor Shad Bibi
- Department of Biochemistry Abdul Wali Khan University Mardan Khyber Pakhtunkhwa Pakistan
| | - Nadir Zaman Khan
- Department of Biotechnology University of Malakand Chakdara Dir (Lower) Pakistan
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40
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Liu C, Chen L, Zhu L. Fouling behavior of lysozyme on different membrane surfaces during the MD operation: An especial interest in the interaction energy evaluation. WATER RESEARCH 2017; 119:33-46. [PMID: 28433881 DOI: 10.1016/j.watres.2017.04.041] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2016] [Revised: 03/20/2017] [Accepted: 04/16/2017] [Indexed: 06/07/2023]
Abstract
The membrane fouling behaviors of lysozyme (LYS) on three different membranes were systematically investigated during the membrane distillation (MD) process, including polypropylene (PP), polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF) membranes. The results showed that PP membrane was not suitable for the MD operation due to its lower heat resistance. A flux decline of 50% was observed for the PTFE, while PVDF displayed a more severe decrement of 70%. Additionally, the PTFE and PVDF membranes both demonstrated a faster flux decline during the early period, and then a clear decrement of fouling rate was obtained at the later period. To better understand the interactions between LYS and different membranes, the interaction energy between LYS and the reconstructed membrane surface, represented by XDLVO potential, was calculated by surface element integration. The PVDF membrane exhibited higher roughness and lower energy barrier, indicating that rougher membrane was tended to be fouled by LYS. Finally, a "four stages model" was suggested for the MD fouling process, which was associated with three LYS deposition patterns of smooth, protuberance and valley.
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Affiliation(s)
- Chang Liu
- Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China
| | - Lin Chen
- Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China.
| | - Liang Zhu
- Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China
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41
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D'Souza RN, Kakarla PB, Yelemane V, Meyer R, den Boer P, Fernández-Lahore M. Controlling cell adhesion in antibody purification by expanded bed adsorption chromatography. Sep Purif Technol 2017. [DOI: 10.1016/j.seppur.2017.03.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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42
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Bittner M, Strejc J, Matoulkova D, Kolska Z, Pustelnikova L, Branyik T. Adhesion ofMegasphaera cerevisiaeonto solid surfaces mimicking materials used in breweries. JOURNAL OF THE INSTITUTE OF BREWING 2017. [DOI: 10.1002/jib.415] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Milan Bittner
- Department of Biotechnology; University of Chemistry and Technology Prague; Technicka 5 166 28 Prague Czech Republic
| | - Jan Strejc
- Department of Biotechnology; University of Chemistry and Technology Prague; Technicka 5 166 28 Prague Czech Republic
| | - Dagmar Matoulkova
- Department of Microbiology; Research Institute of Brewing and Malting; Lipova 15 120 44 Prague Czech Republic
| | - Zdenka Kolska
- Faculty of Science; J. E. Purkyně University; Ceske mladeze 8, 40096 Ústi nad Labem Czech Republic
| | - Lucie Pustelnikova
- Department of Dairy, Fat and Cosmetics; University of Chemistry and Technology Prague; Technicka 5 166 28 Prague Czech Republic
| | - Tomas Branyik
- Department of Biotechnology; University of Chemistry and Technology Prague; Technicka 5 166 28 Prague Czech Republic
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43
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Bittner M, de Souza AC, Brozova M, Matoulkova D, Dias DR, Branyik T. Adhesion of anaerobic beer spoilage bacteria Megasphaera cerevisiae and Pectinatus frisingensis to stainless steel. Lebensm Wiss Technol 2016. [DOI: 10.1016/j.lwt.2016.02.044] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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44
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Conjugated gold nanoparticles as a tool for probing the bacterial cell envelope: The case of Shewanella oneidensis MR-1. Biointerphases 2016; 11:011003. [PMID: 26746161 DOI: 10.1116/1.4939244] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
The bacterial cell envelope forms the interface between the interior of the cell and the outer world and is, thus, the means of communication with the environment. In particular, the outer cell surface mediates the adhesion of bacteria to the surface, the first step in biofilm formation. While a number of ligand-based interactions are known for the attachment process in commensal organisms and, as a result, opportunistic pathogens, the process of nonspecific attachment is thought to be mediated by colloidal, physiochemical, interactions. It is becoming clear, however, that colloidal models ignore the heterogeneity of the bacterial surface, and that the so-called nonspecific attachment may be mediated by specific regions of the cell surface, whether or not the relevant interaction is ligand-mediate. The authors introduce surface functionalized gold nanoparticles to probe the surface chemistry of Shewanella oneidensis MR-1 as it relates to surface attachment to ω-substituted alkanethiolates self-assembled monolayers (SAMs). A linear relationship between the attachment of S. oneidensis to SAM modified planar substrates and the number of similarly modified nanoparticles attached to the bacterial surfaces was demonstrated. In addition, the authors demonstrate that carboxylic acid-terminated nanoparticles attach preferentially to the subpolar region of the S. oneidensis and obliteration of that binding preference corresponds in loss of attachment to carboxylic acid terminated SAMs. Moreover, this region corresponds to suspected functional regions of the S. oneidensis surface. Because this method can be employed over large numbers of cells, this method is expected to be generally applicable for understanding cell surface organization across populations.
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45
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Kujawska A, Kujawski JK, Bryjak M, Cichosz M, Kujawski W. Removal of volatile organic compounds from aqueous solutions applying thermally driven membrane processes. 2. Air gap membrane distillation. J Memb Sci 2016. [DOI: 10.1016/j.memsci.2015.10.047] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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46
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Shao W, Wu J, Liu H, Dong G, Wang S, Min H, Huang M. Graphene oxide reinforced Ni–P coatings for bacterial adhesion inhibition. RSC Adv 2016. [DOI: 10.1039/c6ra04408e] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Bacterial adhesion on the surfaces of medical devices, food processing equipment, heat exchangers and ship hulls has been recognized as a widespread problem.
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Affiliation(s)
- Wei Shao
- College of Chemical Engineering
- Nanjing Forestry University
- Nanjing 210037
- P. R. China
| | - Jimin Wu
- College of Chemical Engineering
- Nanjing Forestry University
- Nanjing 210037
- P. R. China
| | - Hui Liu
- College of Chemical Engineering
- Nanjing Forestry University
- Nanjing 210037
- P. R. China
| | - Guanghui Dong
- College of Chemical Engineering
- Nanjing Forestry University
- Nanjing 210037
- P. R. China
| | - Shuxia Wang
- College of Chemical Engineering
- Nanjing Forestry University
- Nanjing 210037
- P. R. China
| | - Huihua Min
- Advanced Analysis and Testing Center
- Nanjing Forestry University
- Nanjing 210037
- P. R. China
| | - Min Huang
- College of Chemical Engineering
- Nanjing Forestry University
- Nanjing 210037
- P. R. China
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47
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Kim G, Park K, Choi J, Gomez-Flores A, Han Y, Choi SQ, Kim H. Bioflotation of malachite using different growth phases of Rhodococcus opacus: Effect of bacterial shape on detachment by shear flow. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.minpro.2015.09.012] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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48
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A criterion for the characterization of modified surfaces during crystallization fouling based on electron donor component of surface energy. Chem Eng Res Des 2015. [DOI: 10.1016/j.cherd.2015.05.033] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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49
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Naz N, Dsouza RN, Yelemane V, Vennapusa RR, Kangwa M, Fernández-Lahore M. Growth-dependent surface characteristics of Hansenula Polymorpha: implications for expanded bed adsorption chromatography. BIOTECHNOL BIOPROC E 2015. [DOI: 10.1007/s12257-014-0397-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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50
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Zhang X, Zhang Q, Yan T, Jiang Z, Zhang X, Zuo YY. Quantitatively predicting bacterial adhesion using surface free energy determined with a spectrophotometric method. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:6164-71. [PMID: 25898026 PMCID: PMC4854535 DOI: 10.1021/es5050425] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Bacterial adhesion onto solid surfaces is of importance in a wide spectrum of problems, including environmental microbiology, biomedical research, and various industrial applications. Despite many research efforts, present thermodynamic models that rely on the evaluation of the adhesion energy are often elusive in predicting the bacterial adhesion behavior. Here, we developed a new spectrophotometric method to determine the surface free energy (SFE) of bacterial cells. The adhesion behaviors of five bacterial species, Pseudomonas putida KT2440, Salmonella Typhimurium ATCC 14028, Staphylococcus epidermidis ATCC 12228, Enterococcus faecalis ATCC 29212, and Escherichia coli DH5α, onto two model substratum surfaces, i.e., clean glass and silanized glass surfaces, were studied. We found that bacterial adhesion was unambiguously mediated by the SFE difference between the bacterial cells and the solid substratum. The lower the SFE difference, the higher degree of bacterial adhesion. We therefore propose the use of the SFE difference as an accurate and simple thermodynamic measure for quantitatively predicting bacterial adhesion. The methodological advance and thermodynamic simplification in the paper have implications in controlling bacterial adhesion and biofilm formation on solid surfaces.
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Affiliation(s)
- Xinru Zhang
- Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, Hawaii 96822, United States
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
| | - Qian Zhang
- Department of Civil and Environmental Engineering, University of Hawaii at Manoa, Honolulu, Hawaii 96822, United States
| | - Tao Yan
- Department of Civil and Environmental Engineering, University of Hawaii at Manoa, Honolulu, Hawaii 96822, United States
| | - Zeyi Jiang
- School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
| | - Xinxin Zhang
- School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
| | - Yi Y. Zuo
- Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, Hawaii 96822, United States
- Department of Pediatrics, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii 96826, United States
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