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Wang X, Zeng Y, Yuan Z, Chen F, Lo WK, Yuan Y, Li T, Yan X, Wang S. Forced capillary wetting of viscoelastic fluids. J Colloid Interface Sci 2024; 662:555-562. [PMID: 38367573 DOI: 10.1016/j.jcis.2024.02.078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 02/05/2024] [Accepted: 02/07/2024] [Indexed: 02/19/2024]
Abstract
HYPOTHESIS Achieving rapid capillary wetting is highly desirable in nature and industries. Previous endeavors have primarily concentrated on passive wetting strategies through surface engineering. However, these approaches are inadequate for high-viscosity fluids due to the significant viscous resistance, especially for non-Newtonian fluids. In contrast, forced wetting emerges as a promising method to address the challenges associated with achieving rapid wetting of non-Newtonian fluids in capillaries. EXPERIMENTS To investigate the forced wetting behavior of viscoelastic fluids in capillaries, we employ Xanthan Gum (XG) aqueous solutions as target fluids with the storage modulus significantly exceeding the loss modulus. We utilize smooth glass capillaries connected to a syringe pump to achieve high moving speeds of up to 1 m/s. FINDINGS Our experiments reveal a significant distinction in the power-law exponent that governs the scaling relationship between the dynamic contact angle and velocity for viscoelastic fluids compared to Newtonian fluids. This exponent is considerably smaller and varies based on the concentration of viscoelastic fluids and the diameter of the capillaries. We suggest that the viscosity dominates the wetting dynamics of viscoelastic fluids, manifested by the contact line morphology-dependent behavior. This insight has significant implications for microfluidics and drug injectability.
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Affiliation(s)
- Xiong Wang
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China; Centre for Nature-Inspired Engineering, City University of Hong Kong, Hong Kong, China.
| | - Yijun Zeng
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China
| | - Zhenyue Yuan
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China
| | - Feipeng Chen
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China
| | - Wai Kin Lo
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China; Centre for Nature-Inspired Engineering, City University of Hong Kong, Hong Kong, China
| | - Yongjiu Yuan
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China; Centre for Nature-Inspired Engineering, City University of Hong Kong, Hong Kong, China
| | - Tong Li
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China; Centre for Nature-Inspired Engineering, City University of Hong Kong, Hong Kong, China
| | - Xiao Yan
- School of Energy and Power Engineering, Chongqing University, Chongqing, China
| | - Steven Wang
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China; Centre for Nature-Inspired Engineering, City University of Hong Kong, Hong Kong, China.
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Iasella S, Sharma R, Garoff S, Tilton RD. Interaction of impinging marangoni fields. J Colloid Interface Sci 2024; 653:807-820. [PMID: 37757714 DOI: 10.1016/j.jcis.2023.09.109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 09/09/2023] [Accepted: 09/17/2023] [Indexed: 09/29/2023]
Abstract
HYPOTHESIS Surface tension gradient driven Marangoni flows originating from multiple sources are important to many industrial and medical applications, but the theoretical literature focuses on single surfactant sources. Understanding how two spreading surfactant sources interact allows insights from single source experiments to be applied to multi-source applications. Two key features of multi-source spreading - source translation and source deformation - can be explained by transport modeling of a two-source system. MODELING Numerical simulations of two oleic acid disks placed at varying initial separation distances on a glycerol subphase were performed using COMSOL Multiphysics and compared to spreading of a single surfactant source. FINDINGS Interaction of two spreading sources can be split into three regimes: the independent regime - where each source is unaffected by the other, the interaction regime - where the presence of a second source alters one or more features of the spreading dynamics, and the quasi-one disk regime - where the two sources merge together. The translation of the sources, manifested as increasing separation distance between disk centers of mass, is driven by the flow fields within the subphase and the resultant surface deformation, while deformation of the sources occurs only once the surfactant fronts of the two sources meet.
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Affiliation(s)
- Steven Iasella
- Department of Chemical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Ramankur Sharma
- Department of Chemical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Stephen Garoff
- Department of Physics, Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Robert D Tilton
- Department of Chemical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA; Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
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Spectroscopic and tensiometric considerations on anionic surfactants (SDS) and ascorbic acid/ascorbates interactions. JOURNAL OF SAUDI CHEMICAL SOCIETY 2022. [DOI: 10.1016/j.jscs.2022.101532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Wang J, Cao Y, Li G. Comparative Study on the Spreading Behavior of Oil Droplets over Teflon Substrates in Different Media Environments. Polymers (Basel) 2022; 14:polym14142828. [PMID: 35890608 PMCID: PMC9316502 DOI: 10.3390/polym14142828] [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: 05/27/2022] [Revised: 06/17/2022] [Accepted: 06/20/2022] [Indexed: 11/16/2022] Open
Abstract
This paper comparatively investigated the spreading process of an oil droplet on the surface of highly hydrophobic solid (Teflon) in air and water media using a high-speed imaging technology, and analyzed their differences in spreading behavior from the perspective of empirical relations and energy conservation. Furthermore, the classical HD and MKT wetting models were applied to describe the oil droplet spreading dynamics to reveal the spreading mechanism of oil droplets on the Teflon in different media environments. Results showed that the entire spreading process of oil droplets on Teflon in air could be separated into three stages: the early linear fast spreading stage following θ(t)=θ0+kt , the intermediate exponential slow spreading stage obeying θ(t)=bt−3α, and the late spreading stage described by θ(t)=θeq+a×exp(−t/T). However, the dynamics behavior of dynamic contact angle during the oil droplet spreading on Teflon in water could be well described by these expressions, θ(t)=θ0+kt and θ(t)=θeq+a×exp(−t/T). Clearly, a significant difference in the oil droplet spreading behavior in air and water media was found, and the absence of the intermediate exponential spreading stage in the oil–water–Teflon system could be attributed to the difference in the dissipated energy of the system because the dissipation energy in the oil–water–solid system included not only the viscous dissipation energy of the boundary layer of oil droplet, but also that of the surrounding water which was not included in the dissipation energy of the oil–air–solid system. Moreover, the quantitative analysis of wetting models suggested that the MKT model could reasonably describe the late spreading dynamics of oil droplets (low TPCL velocities), while the HD model may be more suitable for describing the oil droplet spreading dynamics at the early and intermediate spreading stages (high TPCL velocities).
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Affiliation(s)
- Junchao Wang
- Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, China;
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
| | - Yijun Cao
- Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, China;
- School of Chemical Engineering and Technology, Zhengzhou University, Zhengzhou 450001, China;
- Correspondence:
| | - Guosheng Li
- School of Chemical Engineering and Technology, Zhengzhou University, Zhengzhou 450001, China;
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Altschuh P, Kunz W, Bremerich M, Reiter A, Selzer M, Nestler B. Wicking in Porous Polymeric Membranes: Determination of an Effective Capillary Radius to Predict the Flow Behavior in Lateral Flow Assays. MEMBRANES 2022; 12:membranes12070638. [PMID: 35877842 PMCID: PMC9318119 DOI: 10.3390/membranes12070638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 06/17/2022] [Accepted: 06/17/2022] [Indexed: 11/29/2022]
Abstract
The working principle of lateral flow assays, such as the widely used COVID-19 rapid tests, is based on the capillary-driven liquid transport of a sample fluid to a test line using porous polymeric membranes as the conductive medium. In order to predict this wicking process by simplified analytical models, it is essential to determine an effective capillary radius for the highly porous and open-pored membranes. In this work, a parametric study is performed with selected simplified structures, representing the complex microstructure of the membrane. For this, a phase-field approach with a special wetting boundary condition to describe the meniscus formation and the corresponding mean surface curvature for each structure setup is used. As a main result, an analytical correlation between geometric structure parameters and an effective capillary radius, based on a correction factor, are obtained. The resulting correlation is verified by applying image analysis methods on reconstructed computer tomography scans of two different porous polymeric membranes and thus determining the geometric structure parameters. Subsequently, a macroscale flow model that includes the correlated effective pore size and geometrical capillary radius is applied, and the results are compared with wicking experiments. Based on the derived correction function, it is shown that the analytical prediction of the wicking process in highly porous polymeric membranes is possible without the fitting of experimental wicking data. Furthermore, it can be seen that the estimated effective pore radius of the two membranes is 8 to 10 times higher than their geometric mean pore radii.
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Affiliation(s)
- Patrick Altschuh
- Institute for Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestr. 30, 76133 Karlsruhe, Germany; (A.R.); (M.S.); (B.N.)
- Institute for Applied Materials–Microstructure Modelling and Simulation, Karlsruhe Institute of Technology, Strasse am Forum 7, 76131 Karlsruhe, Germany
- Correspondence: (P.A.); (W.K.)
| | - Willfried Kunz
- Institute for Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestr. 30, 76133 Karlsruhe, Germany; (A.R.); (M.S.); (B.N.)
- Correspondence: (P.A.); (W.K.)
| | - Marcel Bremerich
- Sartorius Stedim Biotech GmbH, August-Spindler-Strasse 11, 37079 Goettingen, Germany;
| | - Andreas Reiter
- Institute for Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestr. 30, 76133 Karlsruhe, Germany; (A.R.); (M.S.); (B.N.)
| | - Michael Selzer
- Institute for Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestr. 30, 76133 Karlsruhe, Germany; (A.R.); (M.S.); (B.N.)
- Institute for Applied Materials–Microstructure Modelling and Simulation, Karlsruhe Institute of Technology, Strasse am Forum 7, 76131 Karlsruhe, Germany
| | - Britta Nestler
- Institute for Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestr. 30, 76133 Karlsruhe, Germany; (A.R.); (M.S.); (B.N.)
- Institute for Applied Materials–Microstructure Modelling and Simulation, Karlsruhe Institute of Technology, Strasse am Forum 7, 76131 Karlsruhe, Germany
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Sipos B, Csóka I, Szivacski N, Budai-Szűcs M, Schelcz Z, Zupkó I, Szabó-Révész P, Volk B, Katona G. Mucoadhesive meloxicam-loaded nanoemulsions: Development, characterization and nasal applicability studies. Eur J Pharm Sci 2022; 175:106229. [PMID: 35662634 DOI: 10.1016/j.ejps.2022.106229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Revised: 05/10/2022] [Accepted: 05/31/2022] [Indexed: 11/03/2022]
Abstract
Intranasally administered non-steroidal anti-inflammatory drugs (NSAIDs) offer an innovative opportunity in the field of pain management. Combination of the nasal physiological advantages such as the rich vascularization and large absorption area along with novel nanomedical formulations can fulfill all the necessary criteria of an advanced drug delivery system. Nanoemulsions represent a versatile formulation approach suitable for nasal drug delivery by increasing the absorption and the bioavailability of many drugs for systemic and nose-to-brain delivery due to their stability, small droplet size and optimal solubilization properties. In this study we aimed to develop meloxicam (MX)-loaded mucoadhesive nanoemulsions and to investigate the nasal applicability of the optimized formulations. Our results indicated the optimized nanoemulsion formulation (MX-NE3) had a droplet size of 158.5 nm in monodisperse droplet size distribution (polydispersity index of 0.211). The surface charge was -11.2 mV, which helped with the colloidal stability upon dilution at simulated nasal conditions and storage. The high encapsulation efficiency (79.2%) mediated a 15-fold drug release and a 3-fold permeability increase at nasal conditions compared to the initial MX. Proper wetting properties associated with high mucoadhesion prosper the increased residence time on the surface of the nasal mucosa. No cytotoxic effect of the formulations was observed on NIH/3T3 mouse embryonic fibroblast cell lines, which supports the safe nasal applicability.
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Affiliation(s)
- Bence Sipos
- Faculty of Pharmacy, Institute of Pharmaceutical Technology and Regulatory Affairs, University of Szeged, Eötvös Str. 6, Szeged H-6720, Hungary
| | - Ildikó Csóka
- Faculty of Pharmacy, Institute of Pharmaceutical Technology and Regulatory Affairs, University of Szeged, Eötvös Str. 6, Szeged H-6720, Hungary
| | - Nimród Szivacski
- Faculty of Pharmacy, Institute of Pharmaceutical Technology and Regulatory Affairs, University of Szeged, Eötvös Str. 6, Szeged H-6720, Hungary
| | - Mária Budai-Szűcs
- Faculty of Pharmacy, Institute of Pharmaceutical Technology and Regulatory Affairs, University of Szeged, Eötvös Str. 6, Szeged H-6720, Hungary
| | - Zsuzsanna Schelcz
- Faculty of Pharmacy, Institute of Pharmacodynamics and Biopharmacy, University of Szeged, Eötvös Str. 6, Szeged H-6720, Hungary
| | - István Zupkó
- Faculty of Pharmacy, Institute of Pharmacodynamics and Biopharmacy, University of Szeged, Eötvös Str. 6, Szeged H-6720, Hungary
| | - Piroska Szabó-Révész
- Faculty of Pharmacy, Institute of Pharmaceutical Technology and Regulatory Affairs, University of Szeged, Eötvös Str. 6, Szeged H-6720, Hungary
| | - Balázs Volk
- Directorate of Drug Substance Development, Egis Pharmaceuticals PLC., Keresztúri Str. 30-38, Budapest H-1106, Hungary
| | - Gábor Katona
- Faculty of Pharmacy, Institute of Pharmaceutical Technology and Regulatory Affairs, University of Szeged, Eötvös Str. 6, Szeged H-6720, Hungary.
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Kulichikhin VG, Malkin AY, Maklakova AA, Semakov AV. Some Dynamic Properties of the Interface. RUSS J GEN CHEM+ 2022. [DOI: 10.1134/s1070363222040090] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Butt HJ, Liu J, Koynov K, Straub B, Hinduja C, Roismann I, Berger R, Li X, Vollmer D, Steffen W, Kappl M. Contact angle hysteresis. Curr Opin Colloid Interface Sci 2022. [DOI: 10.1016/j.cocis.2022.101574] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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9
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Sauleda ML, Hsieh TL, Xu W, Tilton RD, Garoff S. Surfactant spreading on a deep subphase: Coupling of Marangoni flow and capillary waves. J Colloid Interface Sci 2022; 614:511-521. [PMID: 35121509 DOI: 10.1016/j.jcis.2022.01.142] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 01/21/2022] [Accepted: 01/22/2022] [Indexed: 02/05/2023]
Abstract
HYPOTHESIS Surfactant-driven Marangoni spreading generates a fluid flow characterized by an outwardly moving "Marangoni ridge". Spreading on thin and/or high viscosity subphases, as most of the prior literature emphasizes, does not allow the formation of capillary waves. On deep, low viscosity subphases, Marangoni stresses may launch capillary waves coupled with the Marangoni ridge, and new dependencies emerge for key spreading characteristics on surfactant thermodynamic and kinetic properties. EXPERIMENTS AND MODELING Computational and physical experiments were performed using a broad range of surfactants to report the post-deposition motion of the surfactant front and the deformation of the subphase surface. Modeling coupled the Navier-Stokes and advective diffusion equations with an adsorption model. Separate experiments employed tracer particles or an optical density method to track surfactant front motion or surface deformation, respectively. FINDINGS Marangoni stresses on thick subphases induce capillary waves, the slowest of which is co-mingled with the Marangoni ridge. Changing Marangoni stresses by varying the surfactant system alters the surfactant front velocity and the amplitude - but not the velocity - of the slowest capillary wave. As spreading progresses, the surfactant front and its associated surface deformation separate from the slowest moving capillary wave.
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Affiliation(s)
- Madeline L Sauleda
- Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA; Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Tsung-Lin Hsieh
- Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA; Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Wangrun Xu
- Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA; Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Robert D Tilton
- Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA; Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA; Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
| | - Stephen Garoff
- Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA; Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
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10
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Shao S, Shi D, Hu J, Qing W, Li X, Li X, Ji B, Yang Z, Guo H, Tang CY. Unraveling the Kinetics and Mechanism of Surfactant-Induced Wetting in Membrane Distillation: An In Situ Observation with Optical Coherence Tomography. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:556-563. [PMID: 34928146 DOI: 10.1021/acs.est.1c05090] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
In this study, we performed a direct contact membrane distillation and successfully demonstrated the non-invasive imaging of surfactant-induced wetting using optical coherence tomography. This method enabled us to investigate the wetting kinetics, which was found to follow a "three-region" relationship between the wetting rate and surfactant concentration: the (i) nonwetted region, (ii) concentration-dependent region, and (iii) concentration-independent region at low, intermediate, and high surfactant concentrations, respectively. This wetting behavior was explained by the "autophilic effect", i.e., the wetting was caused by the transfer of surfactants from the water-vapor interface to the unwetted membrane and rendered this membrane hydrophilic, and then the wetting frontier moved forward under capillary forces. At region-(i), the surfactant concentration in the water-vapor interface (Clv) was too low to make the unwetted membrane sufficiently hydrophilic; thereby, the membrane could not be wetted. At region-(ii), due to the fast adsorption of the surfactant on the newly wetted membrane, the wetting rate was determined by the advection/diffusion of surfactants from the feed stream. Consequently, the wetting rate increased with the increases in the water flux and surfactant concentration. At region-(iii), the advection/diffusion provided excess surfactants for adsorption, and thus Clv reached its upper limit (maximum surface excess) and the wetting rate leveled off.
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Affiliation(s)
- Senlin Shao
- School of Civil Engineering, Wuhan University, Wuhan 430072, PR China
| | - Danting Shi
- School of Civil Engineering, Wuhan University, Wuhan 430072, PR China
| | - Jiangshuai Hu
- Department of Water and Wastewater Engineering, Wuhan University of Science and Technology, Wuhan 430081, PR China
| | - Weihua Qing
- Department of Civil and Environmental Engineering, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
| | - Xianhui Li
- Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, Institute of Environmental and Ecological Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Xue Li
- School of Civil Engineering, Wuhan University, Wuhan 430072, PR China
| | - Bin Ji
- Department of Water and Wastewater Engineering, Wuhan University of Science and Technology, Wuhan 430081, PR China
| | - Zhe Yang
- Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong SAR, China
| | - Hao Guo
- Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong SAR, China
| | - Chuyang Y Tang
- Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong SAR, China
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Wong PW, Yim VMW, Guo J, Chan BS, Deka BJ, An AK. Noninvasive Real-Time Monitoring of Wetting Progression in Membrane Distillation Using Impedance Spectroscopy. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:535-545. [PMID: 34935352 DOI: 10.1021/acs.est.1c04433] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Membrane distillation (MD) is a promising technology for the treatment of high salinity wastewater using a hydrophobic membrane; however, the occurrence of wetting due to surfactants in polluted or low surface tension liquid impedes MD application. Common monitoring approaches, such as conductivity and flux measurement, cannot explain the wetting phenomenon that occurs during the wetting process in detail. Recently, impedance spectroscopy has been proposed for early wetting detection, as it depends on the change of water/air composition in the membrane pores. An earlier and larger variation was observed with precise signal detection. In this study, we proposed an analytical approach to estimate the wetting front, which is the average feed intrusion distance, by the impedance value recorded in real-time operation. With this proposed approach, the wetting mechanism in the presence of a surfactant and the effect of pore size on a commercial polyvinylidene fluoride membrane could be quantified, which cannot be explained in detail using conductivity and flux measurements.
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Affiliation(s)
- Pak Wai Wong
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon 999077, Hong Kong
| | - Vicki Man-Wai Yim
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon 999077, Hong Kong
| | - Jiaxin Guo
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon 999077, Hong Kong
| | - Ben Sun Chan
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon 999077, Hong Kong
| | - Bhaskar Jyoti Deka
- Department of Hydrology, Indian Institute of Technology Roorkee, Haridwar, Uttarakhand, 247667, India
| | - Alicia Kyoungjin An
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon 999077, Hong Kong
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Hammi M. Surface and Interface Investigations of Matrix-Fillers in Heterogeneous Amorphous Semiconductors. ACS OMEGA 2021; 6:34075-34085. [PMID: 34926955 PMCID: PMC8675162 DOI: 10.1021/acsomega.1c05314] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 11/22/2021] [Indexed: 05/27/2023]
Abstract
Phosphate glass-based composites are prone to be as effective as amorphous semiconductors, enhancing the glass properties by the addition of a small amount of metallic fillers (Cr, Co, Ni, and Zn) and leading to the creation of composite materials where the conductive particles can be distributed in the glass matrix PbO-P2O5 (PbP) at the micrometer level. This paper deals with scanning electron microscopy (SEM) examination and the wetting behavior of the phosphate glass-metal powder composites. We focused on the filler effect on wetting characteristics, such as interfacial free energy. The change in the contact angle of water on the glass surface was also measured. Scanning electron microscopy images of the composites showed a good dispersion in the fillers within the glass matrix. The contact angles of the composites with water and three polar and apolar solvents were calculated. The total solid surface free energy was analyzed. The interaction parameter between the composites and the liquid has been calculated using Owens-Wendt equation.
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O'Brien DJ, Paranjape M. Modeling Dynamic Surface Tension on Surfactant-Enhanced Polydimethylsiloxane. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:13610-13616. [PMID: 34752697 DOI: 10.1021/acs.langmuir.1c02074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Surfactants are often added to aqueous solutions to induce spreading on otherwise unwettable hydrophobic surfaces. Alternatively, they can be introduced directly into solid hydrophobic materials─such as the soft elastomer, polydimethylsiloxane─to induce autonomous wetting without requiring additional surface or liquid modifications. Given the similarity between mechanisms of these two approaches, models that describe wetting by aqueous surfactant solutions should also characterize wetting on surfactant-solid systems. To investigate this theory, multiple surfactants of varying size and chemical composition were added to prepolymerized PDMS samples. After cross-linking, water droplets were placed on the surfaces at set time points, and their contact angles were recorded to track the temporal evolution of the interfacial tension. Multiple nonlinear models were fitted to this data, their parameters were analyzed, and each goodness of fit was compared. An empirical model of dynamic surface tension was found to describe the wetting process better than the single established model found in the literature. The proposed model adapted better to the longer time scales induced by slow molecular diffusivity in PDMS. Siloxane ethoxylate surfactants induced faster and more complete wetting of PDMS by water than oxyoctylphenol ethoxylates did. The generalizability of this model for characterizing nonionic surfactants of a wide range of physiochemical properties was demonstrated.
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Affiliation(s)
- Daniel J O'Brien
- Department of Physics, Georgetown University, 3700 O Street Northwest, Washington, District of Columbia 20057, United States
| | - Makarand Paranjape
- Department of Physics, Georgetown University, 3700 O Street Northwest, Washington, District of Columbia 20057, United States
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Abstract
In response to increasing natural surfactant demand and environmental concerns, natural plant-based surfactants have been replacing synthetic ones. Saponins belong to a class of plant metabolites with surfactant properties that are widely distributed in nature. They are eco-friendly because of their natural origin and biodegradable. To date, many plant-based saponins have been investigated for their surface activity. An overview of saponins with a particular focus on their surface-active properties is presented in this article. For this purpose, works published in the past few decades, which report better surfactant relevant properties of saponins than synthetic ones, were extensively studied. The investigations on the potential surfactant application of saponins are also documented. Moreover, some biological activities of saponins such as antimicrobial activity, antidiabetic activity, adjuvant potentials, anticancer activity, and others are reported. Plants rich in saponins are widely distributed in nature, offering great potential for the replacement of toxic synthetic surfactants in a variety of modern commercial products and these saponins exhibit excellent surface and biological activities. New opportunities and challenges associated with the development of saponin-based commercial formulations in the future are also discussed in detail.
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16
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Postulka N, Meckel T, Biesalski M. Porosity Centrifuge: Determination of Pore Sizes of Swellable Porous Materials under Hypergravity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:8746-8752. [PMID: 34269591 DOI: 10.1021/acs.langmuir.1c01002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Porous materials are ubiquitous and essential for many processes in nature as well as in industry, and the need to produce them from renewable materials will definitely increase. A prominent example for such a fully recyclable and biogenic porous material is paper, a material that contains macropores formed in between the fibers as well as a large distribution of much finer pores on and within the fiber walls. While the determination of pore sizes is of central importance for the characterization of such materials, their determination is usually only possible with complex methodologies. The determination of pore sizes in the context of water has remained largely unsolved to date, in particular, if water-swellable materials are considered. Here, we introduce a completely new way of determining pore sizes of materials even under swelling conditions. Using a centrifugal device and studying the imbibition of water into paper at various centrifugal forces that oppose the capillary forces, we can access the mean pore size of different paper materials in an experimentally simple fashion. In addition, we can show that the pore size values obtained with our "centrifugal porosimetry" are consistent with the values obtained using other methods, usually much more involved methods. For this purpose, we measure well-characterized translucent macroporous materials using water, ranging from simple glass capillaries to standard filters and nitrocellulose membranes.
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Affiliation(s)
- Niels Postulka
- Technical University of Darmstadt, Ernst-Berl-Institut für Technische und Makromolekulare Chemie, Alarich-Weiss-Str.8, D-64287 Darmstadt, Germany
| | - Tobias Meckel
- Technical University of Darmstadt, Ernst-Berl-Institut für Technische und Makromolekulare Chemie, Alarich-Weiss-Str.8, D-64287 Darmstadt, Germany
| | - Markus Biesalski
- Technical University of Darmstadt, Ernst-Berl-Institut für Technische und Makromolekulare Chemie, Alarich-Weiss-Str.8, D-64287 Darmstadt, Germany
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Seweryn A, Wasilewski T, Bocho-Janiszewska A. Correlations between the Type of Aggregates in the Bulk Phase and the Functionality and Safety of All-Purpose Cleaners. Int J Mol Sci 2021; 22:ijms22126592. [PMID: 34205441 PMCID: PMC8234690 DOI: 10.3390/ijms22126592] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2021] [Revised: 06/11/2021] [Accepted: 06/16/2021] [Indexed: 11/16/2022] Open
Abstract
The article shows that the type and concentration of inorganic salt can be translated into the structure of the bulk phase and the performance properties of ecological all-purpose cleaners (APC). A base APC formulation was developed. Thereafter, two types of salt (sodium chloride and magnesium chloride) were added at various concentrations to obtain different structures in the bulk phase. The salt addition resulted in the formation of spherical micelles and-upon addition of more electrolyte-of aggregates having a lamellar structure. The formulations had constant viscosities (ab. 500 mPa·s), comparable to those of commercial products. Essential physical-chemical and performance properties of the four formulations varying in salt types and concentrations were evaluated. It was found that the addition of magnesium salt resulted in more favorable characteristics due to the surface activity of the formulations, which translated into adequately high wettability of the investigated hydrophobic surfaces, and their ability to emulsify fat. A decreasing relationship was observed in foaming properties: higher salt concentrations lead to worse foaming properties and foam stability of the solutions. For the magnesium chloride composition, the effect was significantly more pronounced, as compared to the sodium chloride-based formulations. As far as safety of use is concerned, the formulations in which magnesium salt was used caused a much lesser irritation compared with the other investigated formulations. The zein value was observed to decrease with increasing concentrations of the given type of salt in the composition.
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Li R, Manica R, Lu Y, Xu Z. Role of surfactants in spontaneous displacement of high viscosity oil droplets from solid surfaces in aqueous solutions. J Colloid Interface Sci 2020; 579:898-908. [PMID: 32711230 DOI: 10.1016/j.jcis.2020.06.069] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 06/14/2020] [Accepted: 06/15/2020] [Indexed: 10/24/2022]
Abstract
HYPOTHESIS Displacement of oil droplets receding from solid surfaces in aqueous solutions plays a critical role in many household activities and industrial operations. Surfactants are often involved in these activities to control the displacement process. We hypothesize that the influence of surfactants on the displacement process of oil is highly dependent on the type and dosage of surfactants, with the mechanisms being elucidated by the analysis using appropriate dynamic wetting models. EXPERIMENTS We systematically investigated the spontaneous displacement of a high viscosity oil on curved hydrophilic glass surfaces in aqueous solutions of anionic sodium dodecylbenzene sulfonate, cationic hexadecyl trimethyl ammonium bromide, and nonionic TritonTM X-100 over a wide range of concentrations. FINDINGS The rather different oil displacement behaviors were observed with different surfactant additions. The displacement dynamics of the receding oil droplet was found to be inhibited by surfactant additions and followed two distinct models quantitatively: the power-law model describing the temporal evolution of early-stage displacement, and the molecular kinetic model describing the dependence of the three-phase contact line displacement velocity on the dynamic contact angle at the late stage of oil displacement. The model-based data analysis provided insights on the role of surfactants in controlling the oil displacement dynamics.
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Affiliation(s)
- Rui Li
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada.
| | - Rogerio Manica
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada.
| | - Yi Lu
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada.
| | - Zhenghe Xu
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada; Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
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Chang TA, Hsu WJ, Hung TH, Hu SW, Tsao HK, Zou C, Lin LC, Kang YH, Chen JJ, Kang DY. Toward Long-Lasting Low-Haze Antifog Coatings through the Deposition of Zeolites. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c01271] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Te-An Chang
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan, ROC
| | - Wan-Ju Hsu
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan, ROC
| | - Ting-Hsiang Hung
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan, ROC
| | - Ssu-Wei Hu
- Department of Chemical and Materials Engineering, National Central University, Taoyuan 32001, Taiwan, ROC
| | - Heng-Kwong Tsao
- Department of Chemical and Materials Engineering, National Central University, Taoyuan 32001, Taiwan, ROC
| | - Changlong Zou
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, 151 West Woodruff Avenue, Columbus, Ohio 43210, United States
| | - Li-Chiang Lin
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, 151 West Woodruff Avenue, Columbus, Ohio 43210, United States
| | - Yu-Hao Kang
- Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, Taiwan, ROC
| | - Jiun-Jen Chen
- Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, Taiwan, ROC
| | - Dun-Yen Kang
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan, ROC
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Role of surfactant in controlling the deposition pattern of a particle-laden droplet: Fundamentals and strategies. Adv Colloid Interface Sci 2020; 275:102049. [PMID: 31757386 DOI: 10.1016/j.cis.2019.102049] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 09/21/2019] [Accepted: 10/15/2019] [Indexed: 11/24/2022]
Abstract
Evaporation of particle-laden droplets has attracted wide attention propelled by the vast applications from disease diagnostics, bio-medicines, agriculture, inkjet printing to coating. Surfactant plays a vital role in controlling the deposition patterns of dried droplets, thanks to its extensive influences on particle transport through adsorbing at particle surface and droplet interfaces as well as suppressing or facilitating multiple flows. In order to accurately control the subtle morphology of a deposition, it is of significance to systematically elaborate the microscopic functions of surfactant, and bridge them to the various phenomena of a droplet. In this review, we first elucidate the effects of surfactant on the flow paradigms of capillary flow, solutal Marangoni flow, thermal Marangoni flow, and the mixed flow patterns as capillary force, thermal and solutal surface tensions are in competence or collaboration. Second, surfactant adsorption at particle surface and droplet interfaces modifying short-range and long-range forces such as electrostatic force, van der Waals force, capillary attraction, and hydrophobic bonding among particles and between particles and interfaces are introduced by the underlying mechanisms and approaches. Two phase diagrams are developed to respectively illustrate the roles of capillary force among particles, and the electrostatic interaction between particles and solid-liquid interface in modifying the deposition profiles. This review could build a fundamental framework of knowledge for evaporating particle-laden surfactant solution droplets, and may shed light on strategies to manipulate particle deposition in abundant fluidic-based techniques.
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Nam G, Yoon SH. Predicting the temporal wetting of porous, surfactant-added polydimethylsiloxane (PDMS). J Colloid Interface Sci 2019; 556:503-513. [PMID: 31473540 DOI: 10.1016/j.jcis.2019.08.081] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 08/22/2019] [Accepted: 08/22/2019] [Indexed: 10/26/2022]
Abstract
Diverse surface/bulk treatments have been introduced to overcome the interfacial limitations of pristine (or untreated) PDMS, thus extending the possible applications of PDMS in micro/nano device development. Despite of extensive efforts, the temporal wetting change of PDMS induced by surface/bulk treatments still remains incompletely understood. We prepared 3 kinds of physicochemically treated PDMS blocks using widely used surface/bulk treatments-3D interconnected pore network formation, biocompatible surfactant (i.e., Silwet L-77) addition, and combination of both. Their wetting nature was characterized by measuring the time profile of water contact angle. A 3D interconnected pore network formation produced a time-invariant decrease in PDMS wettability; a surfactant addition increased the PDMS wettability in a time-variant way; a combination of pore network formation and surfactant addition had a combined effect. The measurement led to the successful development of a model for predicting the temporal wetting change in PDMS caused by variances in pore size and surfactant concentration. The accuracy of our model was verified by comparing experimental results with model predictions. This model will result in better understanding of polymer interface.
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Affiliation(s)
- Gyungmok Nam
- Department of Mechanical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea
| | - Sang-Hee Yoon
- Department of Mechanical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea.
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Xiao D, Cheng J, Liang W, Cheng C, Wang Q, Chai R, Yan Z, Du Y, Zhao J. Innovative Approach to Nano Thiazole-Zn with Promising Physicochemical and Bioactive Properties by Nanoreactor Construction. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:11577-11583. [PMID: 31557026 DOI: 10.1021/acs.jafc.9b03700] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Nanotechnology has provided a novel approach for the preparation of a safe and highly effective pesticide formulation. Thiazole-Zn, a widely used bactericide, was successfully prepared at nanoscale by an innovative approach of final synthesis process control. Its plausible formation mechanism based on restricted particle aggregation in a nanoreactor was elucidated. Then in order to assess the application performance of thiazole-Zn nanoparticle, the nanoformulation (NPF) was conveniently formulated. Interestingly, the physicochemical properties of NPF showed better than that of the commercial pesticide formulation (CPF) in dispersibility, wettability, spreadability, and stability. At the same time, the in vitro bioassay showed that the minimum inhibitory concentrations (MICs) of NPF against Xanthomonas oryzae pv Oryzae (XOO), Xanthomonas oryzae pv Oryzicola (XOC), Erwinia carotovora subsp. Carotovora (Jones) Holland (ECC), and Erwinia chrysanthemi pv Zeae (ECZ) were 46.88, 93.75, 93.75, and 375.00 mg/L, respectively, whereas those of CPF were 93.75, 375.00, 375.00, and 875.00 mg/L, respectively. Therefore, NPF exhibited stronger antibacterial activity against the above-mentioned pathogens. Moreover, NPF was more effective to bacterial blight of rice than CPF in field trial. As a conclusion, nanotechnology for pesticides by synthesis process control will have a potential in improving the utilization efficiency and relieving the corresponding environmental pollution.
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Affiliation(s)
- Douxin Xiao
- Institute of Pesticide and Environmental Toxicology, Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects , Zhejiang University , Hangzhou 310058 , P. R. China
| | - Jingli Cheng
- Institute of Pesticide and Environmental Toxicology, Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects , Zhejiang University , Hangzhou 310058 , P. R. China
| | - Wenlong Liang
- Institute of Pesticide and Environmental Toxicology, Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects , Zhejiang University , Hangzhou 310058 , P. R. China
| | - Cheng Cheng
- Institute of Pesticide and Environmental Toxicology, Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects , Zhejiang University , Hangzhou 310058 , P. R. China
| | - Qiangwei Wang
- Institute of Pesticide and Environmental Toxicology, Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects , Zhejiang University , Hangzhou 310058 , P. R. China
| | - Rongyao Chai
- Institute of Plant Protection and Microbiology , Zhejiang Academy of Agricultural Sciences , Hangzhou 310021 , P. R. China
| | - Zhenlong Yan
- Seed Management Station of Qujiang District , Quzhou 324022 , P. R. China
| | - Yongjun Du
- Institute of Pesticide and Environmental Toxicology, Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects , Zhejiang University , Hangzhou 310058 , P. R. China
| | - Jinhao Zhao
- Institute of Pesticide and Environmental Toxicology, Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects , Zhejiang University , Hangzhou 310058 , P. R. China
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Pukale DD, Bansode AS, Jadhav NL, Pinjari DV, Kulkarni RR. Review on Silicone Surfactants: Silicone-based Gemini Surfactants, Physicochemical Properties and Applications. TENSIDE SURFACT DET 2019. [DOI: 10.3139/113.110617] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
The increasing use of silicone polymers has attracted the interest of many researchers and manufacturers for the past three decades. The silicone surfactants have excellent surface properties, of which the wetting and spreading ability is particularly noteworthy. So silicone surfactants are used in various fields, starting with textiles to agriculture. Because of this particular wetting and spreading property, silicone surfactants will be used together with conventional surfactants to achieve the desired throughput. In this paper we describe in detail the origin of silicone surfactants and various silicone surfactant compounds, as well as their physicochemical properties. We also handle various applications of silicone surfactants in agriculture, textile manufacturing, personal care and cosmetics, polyurethane foam, metal extraction, foam floatation and other industrial applications. However, the main focus is on the latest syntheses, developments and applications of newly developed tailor-made molecules.
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Affiliation(s)
- Dipak D. Pukale
- Oils , Oleochemicals and Surfactants Technology Department, Institute of Chemical Technology , Mumbai (India)
| | - Archana S. Bansode
- Textile and Fibre Technology and Engineering Department , Institute of Chemical Technology , Mumbai (India)
| | - Nilesh L. Jadhav
- Chemical Engineering Department , Institute of Chemical Technology , Mumbai (India)
| | - Dipak V. Pinjari
- National Centre for Nanosciences and Nanotechnology , University of Mumbai, Vidya Nagati, Kalima, Santacruz East, Mumbai Maharashtra, 400 098 , India
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25
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Song Q, Zuo M, Schönherr H. Reconfigurable Microcube Assemblies at the Liquid/Air Interface: The Impact of Surface Tension on Orientation and Capillary-Force-Interaction-Driven Assembly. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:7791-7797. [PMID: 31122021 DOI: 10.1021/acs.langmuir.9b01104] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The systematic investigation of the dependence of the orientation and capillary interaction of hydrophobized polystyrene microcubes at the liquid/air interface on the surface tension of the aqueous subphase is reported. By decreasing the subphase surface tension, the preferential orientation of the cubes was observed to change independent of the surfactant type from the vertex up to the edge up and finally to the face up. Concomitantly, the structure of the aggregates obtained by cube assembly was observed to change from a close-packed hexagonal to tilted linear and finally to flat plate. In particular, the preferential orientation of the cubes was virtually independent of the surfactant charge at a constant surface tension. In addition, reconfigurable microcube assemblies at the liquid/air interface, which respond to the surface tension of the subphase, were observed for the first time. The dynamic reconfigurability of preformed microcube aggregates induced by adding surfactant to the subphase may open new pathways to dynamic assemblies at liquid/air interfaces, which may be interesting, e.g., for sensing applications.
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Affiliation(s)
- Qimeng Song
- Physical Chemistry I and Research Center of Micro and Nanochemistry and Engineering (Cμ), Department of Chemistry and Biology , University of Siegen , Adolf-Reichwein-Str. 2 , 57076 Siegen , Germany
| | - Mengdi Zuo
- Physical Chemistry I and Research Center of Micro and Nanochemistry and Engineering (Cμ), Department of Chemistry and Biology , University of Siegen , Adolf-Reichwein-Str. 2 , 57076 Siegen , Germany
| | - Holger Schönherr
- Physical Chemistry I and Research Center of Micro and Nanochemistry and Engineering (Cμ), Department of Chemistry and Biology , University of Siegen , Adolf-Reichwein-Str. 2 , 57076 Siegen , Germany
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Iasella SV, Sun N, Zhang X, Corcoran TE, Garoff S, Przybycien TM, Tilton RD. Flow regime transitions and effects on solute transport in surfactant-driven Marangoni flows. J Colloid Interface Sci 2019; 553:136-147. [PMID: 31202050 DOI: 10.1016/j.jcis.2019.06.016] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 06/04/2019] [Accepted: 06/05/2019] [Indexed: 11/29/2022]
Abstract
HYPOTHESIS Surfactant-driven Marangoni flow on liquid films is predicted to depend on subphase depth and initial surface tension difference between the subphase and deposited surfactant solution drop. Changes in flow behavior will impact transport of soluble species entrained in the Marangoni flow along the surface. In extreme cases, the subphase film may rupture, limiting transport. Understanding this behavior is important for applications in drug delivery, coatings, and oil spill remediation. EXPERIMENTS A trans-illumination optical technique measured the subphase height profiles and drop content transport after drop deposition when varying initial subphase depth, surfactant concentration, and subphase viscosity. FINDINGS Three distinct flow regimes were identified depending on the subphase depth and surfactant concentration and mapped onto an operating diagram. These are characterized as a "central depression" bounded by an outwardly traveling ridge, an "annular depression" bounded by a central dome and the traveling ridge, and an "annular dewetting" when the subphase ruptures. Well above the critical micelle concentration, transitions between regimes occur at characteristic ratios of gravitational and initial surface tension gradient stresses; transitions shift when surfactant dilution during spreading weakens the stress before the completion of the spreading event. Drop contents travel with the ridge, but dewetting hinders transport.
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Affiliation(s)
- Steven V Iasella
- Department of Chemical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States(2).
| | - Ningguan Sun
- Department of Chemical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States(2)
| | - Xin Zhang
- Department of Chemical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States(2)
| | - Timothy E Corcoran
- Pulmonary, Allergy, and Critical Care Division, Department of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, United States(3).
| | - Stephen Garoff
- Department of Physics, Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States(2).
| | - Todd M Przybycien
- Department of Chemical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States(2); Department of Βiomedical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States(2).
| | - Robert D Tilton
- Department of Chemical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States(2); Department of Βiomedical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, United States(2).
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27
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Wetting and Spreading of Commercially Available Aqueous Surfactants on Porous Materials. COLLOIDS AND INTERFACES 2019. [DOI: 10.3390/colloids3010014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The wetting properties of aqueous solutions of a commercially available surfactant at various concentrations on porous media are investigated using the KRUSS DSA100 shape analyzer and the ADVANCED software to process the data. Time evolution of both the contact angle and drop base diameter at each surfactant concentration after deposition were monitored. Three different porous substrates (sponges) were examined. The sponges used were a car sponge, dish sponge and audio sponge. The sponges were investigated both dry and at different degrees of saturation, that is, the amount of water absorbed into the sponge. It was found that pure distilled water droplets deposited on the dry porous media showed non-wetting. However, if droplets of surfactant solutions were deposited, then a change to a complete wetting case was found at all surfactant concentrations used. It has been observed that for all sponges, no matter the degree of saturation, they display a minimum contact angle after which the droplet is rapidly absorbed into the porous media.
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Sankaran A, Karakashev SI, Sett S, Grozev N, Yarin AL. On the nature of the superspreaders. Adv Colloid Interface Sci 2019; 263:1-18. [PMID: 30471569 DOI: 10.1016/j.cis.2018.10.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2018] [Revised: 10/17/2018] [Accepted: 10/22/2018] [Indexed: 10/27/2022]
Abstract
This is a review article on the basic and the latest achievements on superspreading. The complete and fast spreading of droplets on many surfaces in the nature is a special phenomenon discovered in 1960-ies Intensive studies on this phenomenon have been conducted since that time, but the mechanism of superspreading remained in completely unveiled till nowadays. Here we scrutinized the basic literature on superspreading from the last 25 years and also present results related to superspreaders acquired in the present work. The literature in superspreading can be divided to the following groups: (i) works on the properties of the trisiloxane surfactants; (ii) works on the mechanisms of superspreading; (iii) MD simulations; (iv) works on the effect of the trisiloxane surfactants on thin liquid films. There is a number of review articles published in the last decade related to mainly works from groups (i) and (ii). The works on MD simulations (iii) and the effects on trisiloxane surfactants on thin liquid films (iv) are still few despite they are important from the scientific view point. We conducted our own study on the effect of the superspreaders on foam films in rectangular frame and confirmed that the superspreaders cause powerful Marangoni effect within the foam films. Such a strong Marangoni effect has been never observed with the ordinary surfactants. We scrutinized and discussed the basic works from the groups (i)-(iv) on the superspreading and added our own investigation on the distinguishable effects of superspreaders and non-superspreaders on thin foam films. The work could be useful to both beginners and specialists in the field of wetting/de-wetting and superspreading.
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Butt HJ, Berger R, Steffen W, Vollmer D, Weber SAL. Adaptive Wetting-Adaptation in Wetting. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:11292-11304. [PMID: 30110544 DOI: 10.1021/acs.langmuir.8b01783] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Many surfaces reversibly change their structure and interfacial energy upon being in contact with a liquid. Such surfaces adapt to a specific liquid. We propose the first order kinetic model to describe dynamic contact angles of such adaptive surfaces. The model is general and does not refer to a particular adaptation process. The aim of the proposed model is to provide a quantitative description of adaptive wetting and to link changes in contact angles to microscopic adaptation processes. By introducing exponentially relaxing interfacial energies and applying Young's equation locally, we predict a change of advancing and receding contact angles depending on the velocity of the contact line. Even for perfectly homogeneous and smooth surfaces, a dynamic contact angle hysteresis is obtained. As possible adaptations, we discuss changes and reconstruction of polymer surfaces or monolayers, diffusion and swelling, adsorption of surfactants, replacement of contaminants, reorientation of liquid molecules, or formation of an electric double layer.
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Affiliation(s)
- Hans-Jürgen Butt
- Max Planck Institute for Polymer Research , Ackermannweg 10 , 55128 Mainz , Germany
| | - Rüdiger Berger
- Max Planck Institute for Polymer Research , Ackermannweg 10 , 55128 Mainz , Germany
| | - Werner Steffen
- Max Planck Institute for Polymer Research , Ackermannweg 10 , 55128 Mainz , Germany
| | - Doris Vollmer
- Max Planck Institute for Polymer Research , Ackermannweg 10 , 55128 Mainz , Germany
| | - Stefan A L Weber
- Max Planck Institute for Polymer Research , Ackermannweg 10 , 55128 Mainz , Germany
- Department of Physics , Johannes Gutenberg University , Staudingerweg 10 , 55128 Mainz , Germany
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Badra AT, Zahaf H, Alla H, Roques-Carmes T. A numerical model of superspreading surfactants on hydrophobic surface. PHYSICS OF FLUIDS 2018; 30. [DOI: 10.1063/1.5041804] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
Many contributions significantly on experimental and mathematical studies are made to understand the mechanism of superspreading. Only few numerical methods have been proposed which solve the system of equations with soluble and insoluble surfactants. Among them, we propose a computational fluid dynamics model, based on the volume of fluid technique, with the piecewise linear interface calculation method. Interface reconstruction is applied to simulate the time evolution of the dynamics of drop spreading of surfactants on a thin water layer. We have allowed the occurrence of both the regimes relating to a series of trisiloxane (M(D′EnOH)M), sodium dodecyl sulphate, and Tergitol NP10 surfactants drop on a thin water layer with the influence of Marangoni stress. The numerical data seem consistent with those experimental for both regimes. It validates predictions for the spreading exponent in which the law of the radius of the circular area covered by the surfactant grows as tα, where 0 < α < 1. The comparison of the numerical and experimental predictions by Lee et al. [“Spreading of trisiloxanes over thin aqueous layers,” Colloid J. 71, 365–369 (2009)] is well represented in both regimes. The numerical study confirms that the spreading rates during the first stage increase as the solubility increases. This finding suggests that the model is adequate for describing the spreading of surfactants on thin fluid layers.
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Affiliation(s)
- Ali Talha Badra
- Laboratoire de Physique des Matériaux et des Fluides, Université des Sciences et de la Technologie d’Oran 1 , BP 1505 El M’Naouar Bir el Djir, 31000 Oran, Algeria
| | - Hanane Zahaf
- Laboratoire de Physique des Matériaux et des Fluides, Université des Sciences et de la Technologie d’Oran 1 , BP 1505 El M’Naouar Bir el Djir, 31000 Oran, Algeria
| | - Hocine Alla
- Laboratoire de Physique des Matériaux et des Fluides, Université des Sciences et de la Technologie d’Oran 1 , BP 1505 El M’Naouar Bir el Djir, 31000 Oran, Algeria
| | - Thibault Roques-Carmes
- Université de Lorraine, Laboratoire Réactions et Génie des Procédés, UMR 7274 CNRS 2 , Nancy F-54000, France
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Stetten AZ, Iasella SV, Corcoran TE, Garoff S, Przybycien TM, Tilton RD. Surfactant-induced Marangoni transport of lipids and therapeutics within the lung. Curr Opin Colloid Interface Sci 2018; 36:58-69. [PMID: 30147429 PMCID: PMC6103298 DOI: 10.1016/j.cocis.2018.01.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Understanding the fundamentals of surface transport on thin viscous films has important application in pulmonary drug delivery. The human lung contains a large-area interface between its complex fluid lining and inhaled air. Marangoni flows driven by surface tension gradients along this interface would promote enhanced distribution of inhaled therapeutics by carrying them from where they are deposited in the upper airways, along the fluid interface to deeper regions of the lung. Motivated by the potential to improve therapies for acute and chronic lung diseases, we review recent progress in modeling and experimental studies of Marangoni transport induced by the deposition of surfactant-containing microliter drops and liquid aerosols (picoliter drops) onto a fluid interface. The roles of key system variables are identified, including surfactant solubility, drop miscibility with the subphase, and the thickness, composition and surface properties of the subphase liquid. Of particular interest is the unanticipated but crucial role of aerosol processing to achieve Marangoni transport via phospholipid vesicle dispersions, which are likely candidates for a biocompatible delivery system. Progress in this field has the potential to not only improve outcomes in patients with chronic and acute lung diseases, but also to further our understanding of surface transport in complex systems.
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Affiliation(s)
- Amy Z. Stetten
- Carnegie Mellon Center for Complex Fluids Engineering, Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Steven V. Iasella
- Carnegie Mellon Center for Complex Fluids Engineering, Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | | | - Stephen Garoff
- Carnegie Mellon Center for Complex Fluids Engineering, Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Todd M. Przybycien
- Carnegie Mellon Center for Complex Fluids Engineering, Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA
- Carnegie Mellon Center for Complex Fluids Engineering, Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Robert D. Tilton
- Carnegie Mellon Center for Complex Fluids Engineering, Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA
- Carnegie Mellon Center for Complex Fluids Engineering, Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA
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Emulsions in porous media: From single droplet behavior to applications for oil recovery. Adv Colloid Interface Sci 2018; 256:305-325. [PMID: 29622270 DOI: 10.1016/j.cis.2018.03.002] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Revised: 03/06/2018] [Accepted: 03/07/2018] [Indexed: 12/16/2022]
Abstract
Emulsions are suspensions of droplets ubiquitous in oil recovery from underground reservoirs. Oil is typically trapped in geological porous media where emulsions are either formed in situ or injected to elicit oil mobilization and thus enhance the amount of oil recovered. Here, we briefly review basic concepts on geometrical and wetting features of porous media, including thin film stability and fluids penetration modes, which are more relevant for oil recovery and oil-contaminated aquifers. Then, we focus on the description of emulsion flow in porous media spanning from the behaviour of single droplets to the collective flow of a suspension of droplets, including the effect of bulk and interfacial rheology, hydrodynamic and physico-chemical interactions. Finally, we describe the particular case of emulsions used in underground porous media for enhanced oil recovery, thereby discussing some perspectives of future work. Although focused on oil recovery related topics, most of the insights we provide are useful towards remediation of oil-contaminated aquifers and for a basic understanding of emulsion flow in any kind of porous media, such as biological tissues.
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Mattingly AE, Weaver AA, Dimkovikj A, Shrout JD. Assessing Travel Conditions: Environmental and Host Influences On Bacterial Surface Motility. J Bacteriol 2018; 200:e00014-18. [PMID: 29555698 PMCID: PMC5952383 DOI: 10.1128/jb.00014-18] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
The degree to which surface motile bacteria explore their surroundings is influenced by aspects of their local environment. Accordingly, regulation of surface motility is controlled by numerous chemical, physical, and biological stimuli. Discernment of such regulation due to these multiple cues is a formidable challenge. Additionally inherent ambiguity and variability from the assays used to assess surface motility can be an obstacle to clear delineation of regulated surface motility behavior. Numerous studies have reported single environmental determinants of microbial motility and lifestyle behavior but the translation of these data to understand surface motility and bacterial colonization of human host or environmental surfaces is unclear. Here, we describe the current state of the field and our understanding of exogenous factors that influence bacterial surface motility.
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Affiliation(s)
- Anne E. Mattingly
- Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, Notre Dame, Indiana, USA
| | - Abigail A. Weaver
- Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, Notre Dame, Indiana, USA
| | - Aleksandar Dimkovikj
- Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, Notre Dame, Indiana, USA
| | - Joshua D. Shrout
- Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, Notre Dame, Indiana, USA
- Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana, USA
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Harikrishnan AR, Dhar P, Gedupudi S, Das SK. Effect of Interaction of Nanoparticles and Surfactants on the Spreading Dynamics of Sessile Droplets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:12180-12192. [PMID: 28982242 DOI: 10.1021/acs.langmuir.7b02123] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
While a body of literature on the spreading dynamics of surfactants and a few studies on the spreading dynamics of nanocolloids exist, to the best of the authors' knowledge, there are no reports on the effect of presence of surfactants on the spreading dynamics of nanocolloidal suspensions. For the first time the present study reports an extensive experimental and theoretical study on the effect of surfactant impregnated nanocolloidal complex fluids in modulating the spreading dynamics. A segregation analysis of the effect of surfactants alone, nanoparticle alone, and the combined effect of nanoparticle and surfactants in altering the spreading dynamics have been studied in detail. The spreading dynamics of nanocolloidal solutions alone and of the surfactant impregnated nanocolloidal solutions are found to be grossly different, and particle morphology is found to play a predominant role. For the first time the present study experimentally proves that the classical Tanner's law is disobeyed by the complex fluids in the case of particle alone and combined particle and surfactant case. We also discuss the role of imbibitions across the particle wedge in the precursor film in tuning spreading dynamics. We propose an analytical model to predict the nature of dependency of contact radius on time for the complex colloids. A detailed theoretical examination of the governing factors, the interacting forces at the three phase contact line, and the effects of interplay of surfactants and the nanoparticles at the precursor film in modulating the spreading dynamics has been presented for such complex colloids.
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Affiliation(s)
- A R Harikrishnan
- Department of Mechanical Engineering, Indian Institute of Technology Madras , Chennai-600036, India
| | - Purbarun Dhar
- Department of Mechanical Engineering, Indian Institute of Technology Ropar , Rupnagar-140001, India
| | - Sateesh Gedupudi
- Department of Mechanical Engineering, Indian Institute of Technology Madras , Chennai-600036, India
| | - Sarit K Das
- Department of Mechanical Engineering, Indian Institute of Technology Madras , Chennai-600036, India
- Department of Mechanical Engineering, Indian Institute of Technology Ropar , Rupnagar-140001, India
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Iasella SV, Stetten AZ, Corcoran TE, Garoff S, Przybycien TM, Tilton RD. Aerosolizing Lipid Dispersions Enables Antibiotic Transport Across Mimics of the Lung Airway Surface Even in the Presence of Pre-existing Lipid Monolayers. J Aerosol Med Pulm Drug Deliv 2017; 31:212-220. [PMID: 29053080 DOI: 10.1089/jamp.2017.1412] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Secondary lung infections are the primary cause of morbidity associated with cystic fibrosis lung disease. Aerosolized antibiotic inhalation is potentially advantageous but has limited effectiveness due to altered airway aerodynamics and deposition patterns that limit drug access to infected regions. One potential strategy to better reach infected areas is to formulate aerosols with surfactants that induce surface tension gradients and drive postdeposition drug dispersal via Marangoni transport along the airway surface liquid (ASL). Since this relies on surfactant-induced surface tension reduction, the presence of endogenous lipid monolayers may hinder drug dispersal performance. METHODS Tobramycin solutions were formulated with dipalmitoylphosphatidylcholine (DPPC), a major component of endogenous pulmonary surfactant, to drive postdeposition aerosol dispersal across a model ASL based on a liquid layer or "subphase" of aqueous porcine gastric mucin (PGM) solution with predeposited DPPC monolayers to mimic the endogenous surfactant. In vitro subphase samples were collected from regions outside the aerosol deposition zone and assayed for tobramycin concentration using a closed enzyme donor immunoassay. The motion of a tracking bead across the subphase surface and the corresponding decrease in surface tension on aerosol deposition were tracked both with and without a predeposited DPPC monolayer. The surface tension/area isotherm for DPPC on PGM solution subphase was measured to aid in the interpretation of the tobramycin dispersal behavior. RESULTS AND CONCLUSIONS Transport of tobramycin away from the deposition region occurs in aerosols formulated with DPPC whether or not predeposited lipid is present, and tobramycin concentrations are similar in both cases across biologically relevant length scales (∼8 cm). When DPPC is deposited from an aerosol, it induces ultralow surface tensions (<5 mN/m), which drive Marangoni flows, even in the presence of a dense background layer of DPPC. Therefore, aerosolized phospholipids, such as DPPC, will likely be effective spreading agents in the human lung.
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Affiliation(s)
- Steven V Iasella
- 1 Department of Chemical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University , Pittsburgh, Pennsylvania
| | - Amy Z Stetten
- 2 Department of Physics, Center for Complex Fluids Engineering, Carnegie Mellon University , Pittsburgh, Pennsylvania
| | - Timothy E Corcoran
- 3 Department of Medicine, Pulmonary, Allergy, and Critical Care Division, University of Pittsburgh , Pittsburgh, Pennsylvania.,4 Department of Biomedical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University , Pittsburgh, Pennsylvania
| | - Stephen Garoff
- 2 Department of Physics, Center for Complex Fluids Engineering, Carnegie Mellon University , Pittsburgh, Pennsylvania
| | - Todd M Przybycien
- 1 Department of Chemical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University , Pittsburgh, Pennsylvania.,4 Department of Biomedical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University , Pittsburgh, Pennsylvania
| | - Robert D Tilton
- 1 Department of Chemical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University , Pittsburgh, Pennsylvania.,4 Department of Biomedical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University , Pittsburgh, Pennsylvania
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36
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Han L, Tan YZ, Netke T, Fane AG, Chew JW. Understanding oily wastewater treatment via membrane distillation. J Memb Sci 2017. [DOI: 10.1016/j.memsci.2017.06.012] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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37
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Semakov AV, Postnov EM, Kulichikhin VG, Malkin AY. Explosive spreading of a concentrated emulsion over a liquid surface. COLLOID JOURNAL 2017. [DOI: 10.1134/s1061933x17030139] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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38
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Active depinning of bacterial droplets: The collective surfing of Bacillus subtilis. Proc Natl Acad Sci U S A 2017; 114:5958-5963. [PMID: 28536199 DOI: 10.1073/pnas.1703997114] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
How systems are endowed with migration capacity is a fascinating question with implications ranging from the design of novel active systems to the control of microbial populations. Bacteria, which can be found in a variety of environments, have developed among the richest set of locomotion mechanisms both at the microscopic and collective levels. Here, we uncover, experimentally, a mode of collective bacterial motility in humid environment through the depinning of bacterial droplets. Although capillary forces are notoriously enormous at the bacterial scale, even capable of pinning water droplets of millimetric size on inclined surfaces, we show that bacteria are able to harness a variety of mechanisms to unpin contact lines, hence inducing a collective slipping of the colony across the surface. Contrary to flagella-dependent migration modes like swarming, we show that this much faster "colony surfing" still occurs in mutant strains of Bacillus subtilis lacking flagella. The active unpinning seen in our experiments relies on a variety of microscopic mechanisms, which could each play an important role in the migration of microorganisms in humid environment.
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39
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Dukhin SS, Labib ME. Hydrodynamically-driven drug release during interstitial flow through hollow fibers implanted near lymphatics. Colloids Surf A Physicochem Eng Asp 2017; 521:177-192. [PMID: 28579697 PMCID: PMC5453677 DOI: 10.1016/j.colsurfa.2016.08.052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Current drug delivery devices (DDD) are mainly based on the use of diffusion as the main transport process. Diffusion-driven processes can only achieve low release rate because diffusion is a slow process. This represents a serious obstacle in the realization of recent successes in the suppression of lymphatic metastasis and in the prevention of limb and organ transplant rejection. Surprisingly, it was overlooked that there is a more favorable drug release mode which can be achieved when a special DDD is implanted near lymphatics. This opportunity can be realized when the interstitial fluid flow penetrates a drug delivery device of proper design and allows such fluid to flow out of it. This design is based on hollow fibers loaded with drug and whose hydrodynamic permeability is much higher than that of the surrounding tissue. The latter is referred to as hollow fiber of high hydrodynamic permeability (HFHP). The interstitial flow easily penetrates the hollow fiber membrane as well as its lumen with a higher velocity than that in the adjacent tissue. The interstitial liquid stream entering the lumen becomes almost saturated with drug as it flows out of the HFHP. This is due to the drug powder dissolution in the lumens of HFHP which forms a strip of drug solution that crosses the interstitium and finally enters the lymphatics. This hydrodynamically-driven release (HDR) may exceed the concomitant diffusion-driven release (DDR) by one or even two orders of magnitude. The hydrodynamics of the two-compartment media is sufficient for developing the HDR theory which is detailed in this paper. Convective diffusion theory for two compartments (membrane of hollow fiber and adjacent tissue) is required for exact quantification when a small contribution of DDR to predominating HDR is present. Hence, modeling is important for HDR which would lead to establishing a new branch in physico-chemical hydrodynamics. The release rate achieved with the use of HFHP increases proportional to the number of hollow fibers in the fabric employed in drug delivery. Based on this contribution, it is now possible to simultaneously provide high release rates and long release durations, thus overcoming a fundamental limitation in drug delivery. Perhaps this breakthrough in long-term drug delivery has potential applications in targeting lymphatics and in treating cancer and cancer metastasis without causing the serious side effects of systemic drugs.
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Affiliation(s)
| | - Mohamed E Labib
- NovaFlux Technologies, 1 Wall Street, Princeton, NJ 08540, USA
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40
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Ivanova N, Kubochkin N, Starov V. Wetting of hydrophobic substrates by pure surfactants at continuously increasing humidity. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2016.07.096] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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41
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Kowalczyk D, Gustaw W, Zięba E, Lisiecki S, Stadnik J, Baraniak B. Microstructure and functional properties of sorbitol-plasticized pea protein isolate emulsion films: Effect of lipid type and concentration. Food Hydrocoll 2016. [DOI: 10.1016/j.foodhyd.2016.04.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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42
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Chen X, Wang H, Liu W, Li G, Yu D, Song Z. A stable AKD-in-water emulsion: Stabilized by MSG-modified laponite nanoparticle. J DISPER SCI TECHNOL 2016. [DOI: 10.1080/01932691.2016.1219954] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Xueshuai Chen
- Key Laboratory of Pulp & Paper Science and Technology (Ministry of Education), Qilu University of Technology, Jinan, China
| | - Huili Wang
- Key Laboratory of Pulp & Paper Science and Technology (Ministry of Education), Qilu University of Technology, Jinan, China
| | - Wenxia Liu
- Key Laboratory of Pulp & Paper Science and Technology (Ministry of Education), Qilu University of Technology, Jinan, China
| | - Guodong Li
- Key Laboratory of Pulp & Paper Science and Technology (Ministry of Education), Qilu University of Technology, Jinan, China
| | - Dehai Yu
- Key Laboratory of Pulp & Paper Science and Technology (Ministry of Education), Qilu University of Technology, Jinan, China
| | - Zhaoping Song
- Key Laboratory of Pulp & Paper Science and Technology (Ministry of Education), Qilu University of Technology, Jinan, China
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43
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Wang C, Tai X, Du Z, Liu X. Formulation and physicochemical properties of promising avermectin microemulsion with biodegradable surfactant and oil. J DISPER SCI TECHNOL 2016. [DOI: 10.1080/01932691.2016.1172315] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Chuanxin Wang
- China Research Institute of Daily Chemical Industry, Taiyuan, China
| | - Xiumei Tai
- China Research Institute of Daily Chemical Industry, Taiyuan, China
| | - Zhiping Du
- China Research Institute of Daily Chemical Industry, Taiyuan, China
- Institute of Resources and Environment Engineering, Shanxi University, Taiyuan, China
| | - Xiaoying Liu
- Institute of Resources and Environment Engineering, Shanxi University, Taiyuan, China
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Cui LY, Ding ZW, Liu LY, Han HS. Equilibrium and kinetics of wetting hydrophobic microporous membrane in sodium dodecyl benzene sulphonate and diethanolamine aqueous solutions. CHEMICAL PAPERS 2016. [DOI: 10.1515/chempap-2015-0208] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractLiquid penetrations into hydrophobic capillaries are controlled by the adsorption and diffusion of the solute in the vicinity of the moving meniscus. The wetting process of microporous hydrophobic polyvinylidenefluoride (PVDF) and polytetrafluoroethylene (PTFE) membrane was investigated in both sodium dodecyl benzene sulphonate (SDBS) and diethanolamine (DEA) aqueous solutions. The experimental results revealed that wetting both the PVDF and PTFE membranes in SDBS solutions at high concentrations proceeded in two stages: rapid wetting and slow wetting, but this transition in the wetting rate was not observed during the membrane wetting at low SDBS concentration and in DEA solutions. The membrane wetting process was accelerated by increasing the solution temperature.
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45
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Control of stain geometry by drop evaporation of surfactant containing dispersions. Adv Colloid Interface Sci 2015; 222:275-90. [PMID: 25217332 DOI: 10.1016/j.cis.2014.08.004] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2014] [Revised: 08/16/2014] [Accepted: 08/18/2014] [Indexed: 11/22/2022]
Abstract
Control of stain geometry by drop evaporation of surfactant containing dispersions is an important topic of interest because it plays a crucial role in many applications such as forming templates on solid surfaces, in ink-jet printing, spraying of pesticides, micro/nano material fabrication, thin film coatings, biochemical assays, deposition of DNA/RNA micro-arrays, and manufacture of novel optical and electronic materials. This paper presents a review of the published articles on the diffusive drop evaporation of pure liquids (water), the surfactant stains obtained from evaporating drops that do not contain dispersed particles and deposits obtained from drops containing polymer colloids and carbon based particles such as carbon nanotubes, graphite and fullerenes. Experimental results of specific systems and modeling attempts are discussed. This review also has some special subtopics such as suppression of coffee-rings by surfactant addition and "stick-slip" behavior of evaporating nanosuspension drops. In general, the drop evaporation process of a surfactant/particle/substrate system is very complex since dissolved surfactants adsorb on both the insoluble organic/inorganic micro/nanoparticles in the drop, on the air/solution interface and on the substrate surface in different extends. Meanwhile, surfactant adsorbed particles interact with the substrate giving a specific contact angle, and free surfactants create a solutal Marangoni flow in the drop which controls the location of the particle deposition together with the rate of evaporation. In some cases, the presence of a surfactant monolayer at the air/solution interface alters the rate of evaporation. At present, the magnitude of each effect cannot be predicted adequately in advance and consequently they should be carefully studied for any system in order to control the shape and size of the final deposit.
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46
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Fukuoka T, Yoshida S, Nakamura J, Koitabashi M, Sakai H, Abe M, Kitamoto D, Kitamoto H. Application of yeast glycolipid biosurfactant, mannosylerythritol lipid, as agrospreaders. J Oleo Sci 2015; 64:689-95. [PMID: 25891117 DOI: 10.5650/jos.ess15017] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The spreading property of mannosylerythritol lipids (MELs) was investigated in connection with our search for new application in agriculture. The wetting ability of MEL solutions for hydrophobic surfaces was evaluated based on contact angle measurements for several surfactant solutions on abiotic and biotic surfaces. The contact angle of MEL-A solution on a hydrophobic plastic surface at 100 s after placement decreased to 8.4°, and those of other MEL solutions decreased more significantly compared to those of commonly-used nonionic surfactants. In addition, the contact angle of MEL solutions also dropped down to around 10° on various plant leaf surfaces. MEL solutions, in particular, efficiently spread even on poorly wettable Gramineae plant surfaces on which general nonionic surfactant solutions could not. Moreover, the wetting ability of MEL solutions was found to be greatly affected by the structural difference in their carbohydrate configuration. Furthermore, surface pretreatment with MEL solution led to more efficient spreading and fixing of microbial cells onto plant leaf surface compared to several conventional surfactants used in this study. These results suggested that MELs have a potential to use as a natural bio-based spreading agent, particularly as agrochemical spreader for biopesticides.
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Affiliation(s)
- Tokuma Fukuoka
- Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST)
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WALKER SHAUNC, ALLEN STEPHANIE, BELL GORDON, ROBERTS CLIVEJ. Analysis of leaf surfaces using scanning ion conductance microscopy. J Microsc 2015; 258:119-26. [DOI: 10.1111/jmi.12225] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Accepted: 12/23/2014] [Indexed: 11/28/2022]
Affiliation(s)
- SHAUN C. WALKER
- Laboratory of Biophysics and Surface Analysis, School of Pharmacy; The University of Nottingham; University Park Nottingham UK
| | - STEPHANIE. ALLEN
- Laboratory of Biophysics and Surface Analysis, School of Pharmacy; The University of Nottingham; University Park Nottingham UK
| | - GORDON BELL
- Syngenta, Jealotts Hill International Research Centre; Bracknell Berkshire UK
| | - CLIVE J. ROBERTS
- Laboratory of Biophysics and Surface Analysis, School of Pharmacy; The University of Nottingham; University Park Nottingham UK
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48
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Guo HY, Li Q, Zhao HP, Zhou K, Feng XQ. Functional map of biological and biomimetic materials with hierarchical surface structures. RSC Adv 2015. [DOI: 10.1039/c5ra09490a] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
The properties and functions of both biological and artificial materials with hierarchical surface structures are reviewed to establish the functional map of various hierarchical surface structures.
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Affiliation(s)
- Hao-Yuan Guo
- Institute of Biomechanics and Medical Engineering
- AML
- Department of Engineering Mechanics
- Tsinghua University
- Beijing 100084
| | - Qunyang Li
- Institute of Biomechanics and Medical Engineering
- AML
- Department of Engineering Mechanics
- Tsinghua University
- Beijing 100084
| | - Hong-Ping Zhao
- Institute of Biomechanics and Medical Engineering
- AML
- Department of Engineering Mechanics
- Tsinghua University
- Beijing 100084
| | - Kun Zhou
- School of Mechanical and Aerospace Engineering
- Nanyang Technological University
- Singapore
- Singapore
| | - Xi-Qiao Feng
- Institute of Biomechanics and Medical Engineering
- AML
- Department of Engineering Mechanics
- Tsinghua University
- Beijing 100084
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49
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Andrade R, Skurtys O, Osorio F, Zuluaga R, Gañán P, Castro C. Wettability of gelatin coating formulations containing cellulose nanofibers on banana and eggplant epicarps. Lebensm Wiss Technol 2014. [DOI: 10.1016/j.lwt.2014.02.034] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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50
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Gharabaghi M, Aghazadeh S. A review of the role of wetting and spreading phenomena on the flotation practice. Curr Opin Colloid Interface Sci 2014. [DOI: 10.1016/j.cocis.2014.07.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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