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Yan S, Liu C, Hou LA, Wang B, Zhang Y. A new filterless indoor air purifier for particulate matter and bioaerosol based on heterogeneous condensation. ENVIRONMENTAL RESEARCH 2023; 218:115034. [PMID: 36502900 DOI: 10.1016/j.envres.2022.115034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 11/28/2022] [Accepted: 12/08/2022] [Indexed: 06/17/2023]
Abstract
Using an indoor air purifier is an important solution for improving indoor air quality and protecting people from the harmful effects of air pollution on their health. The filter air purifiers can remove particulate matter including bioaerosols, but their filter media can cause secondary pollution. To fulfill this need, a new filterless indoor air purifier, the Cloud-Air-Purifying (CAP) air purifier, is presented in this study. Using heterogeneous condensation and supergravity technology, the CAP air purifier grows and collects fine particles, while rapidly disinfecting bioaerosols with chemical disinfection and ultraviolet (UV) disinfection. Furthermore, the purifying performance of the CAP air purifier was tested in a simulated cabin. The results showed the clean air delivery rate (CADR) of the CAP air purifier was approximately 150 m3/h, and the effective coefficient was 0.93. The CAP air purifier was highly efficient in purifying fine particulate matter, 93% for PM10 and 91% for particle size of 0.5-1 μm in 60 min, which was 13-58 times more than natural decay. The reason for the efficient removal of fine particles is that they can condense and grow in water vapor supersaturated environment and be collected in a supergravity field. Moreover, the CAP air purifier has significant bactericidal effects on bioaerosols. It achieved a disinfection efficiency of 99.99997% by decreasing bioaerosols from 108 CFU/m3 to less than 30 CFU/m3 in only 20 min when particle purification in combination with UV disinfection and disinfectant (ClO2). Furthermore, ClO2 release concentrations, noise, and power consumption were investigated for application purposes, with results showing that they were within acceptable limits. The study presents an innovative idea and design for preventing airborne microorganisms and particulate matter through heterogeneous condensation technology.
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Affiliation(s)
- Shijun Yan
- Key Laboratory of Western China's Environmental Systems (Ministry of Education) and Engineering Research Center of Fine Particle Pollution Control Technology and Equipment, Gansu Province, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, PR China
| | - Chang Liu
- Key Laboratory of Western China's Environmental Systems (Ministry of Education) and Engineering Research Center of Fine Particle Pollution Control Technology and Equipment, Gansu Province, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, PR China
| | - Li-An Hou
- Key Laboratory of Western China's Environmental Systems (Ministry of Education) and Engineering Research Center of Fine Particle Pollution Control Technology and Equipment, Gansu Province, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, PR China; Xi'an High-Tech Institute, Xi'an, 710025, PR China
| | - Bo Wang
- Key Laboratory of Western China's Environmental Systems (Ministry of Education) and Engineering Research Center of Fine Particle Pollution Control Technology and Equipment, Gansu Province, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, PR China
| | - Yumeng Zhang
- Key Laboratory of Western China's Environmental Systems (Ministry of Education) and Engineering Research Center of Fine Particle Pollution Control Technology and Equipment, Gansu Province, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, PR China; College of Atmospheric Sciences, Lanzhou University, PR China.
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2
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Surface Disinfection to Protect against Microorganisms: Overview of Traditional Methods and Issues of Emergent Nanotechnologies. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10176040] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Sterilization methods for individuals and facilities are extremely important to enable human beings to continue the basic tasks of life and to enable safe and continuous interaction of citizens in society when outbreaks of viral pandemics such as the coronavirus. Sterilization methods, their availability in gatherings, and the efficiency of their work are among the important means to contain the spread of viruses and epidemics and enable societies to practice their activities almost naturally. Despite the effective solutions given by traditional methods of surface disinfection, modern nanotechnology has proven to be an emergent innovation to protect against viruses. On this note, recent scientific breakthroughs have highlighted the ability of nanospray technology to attach to air atoms in terms of size and time-period of existence as a sterilizer for renewed air in large areas for human gatherings. Despite the ability of this method to control the outbreak of infections, the mutation of bactericidal mechanisms presents a great issue for scientists. In recent years, science has explored a more performant approach and techniques based on a surface-resistance concept. The most emergent is the self-defensive antimicrobial known as the self-disinfection surface. It consists of the creation of a bacteria cell wall to resist the adhesion of bacteria or to kill bacteria by chemical or physical changes. Besides, plasma-mediated virus inactivation was shown as a clean, effective, and human healthy solution for surface disinfection. The purpose of this article is to deepen the discussion on the threat of traditional methods of surface disinfection and to assess the state of the art and potential solutions using emergent nanotechnology.
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Stavitskaya A, Batasheva S, Vinokurov V, Fakhrullina G, Sangarov V, Lvov Y, Fakhrullin R. Antimicrobial Applications of Clay Nanotube-Based Composites. NANOMATERIALS 2019; 9:nano9050708. [PMID: 31067741 PMCID: PMC6567215 DOI: 10.3390/nano9050708] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Revised: 04/28/2019] [Accepted: 04/30/2019] [Indexed: 12/25/2022]
Abstract
Halloysite nanotubes with different outer surface/inner lumen chemistry (SiO2/Al2O3) are natural objects with a 50 nm diameter hollow cylindrical structure, which are able to carry functional compounds both inside and outside. They are promising for biological applications where their drug loading capacity combined with a low toxicity ensures the safe interaction of these nanomaterials with living cells. In this paper, the antimicrobial properties of the clay nanotube-based composites are reviewed, including applications in microbe-resistant biocidal textile, paints, filters, and medical formulations (wound dressings, drug delivery systems, antiseptic sprays, and tissue engineering scaffolds). Though halloysite-based antimicrobial materials have been widely investigated, their application in medicine needs clinical studies. This review suggests the scalable antimicrobial nano/micro composites based on natural tubule clays and outlines research and development perspectives in the field.
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Affiliation(s)
- Anna Stavitskaya
- Functional Aluminosilicate Nanomaterials Lab, Gubkin University, 119991 Moscow, Russia.
| | - Svetlana Batasheva
- Bionanotechnology Lab, Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia.
| | - Vladimir Vinokurov
- Functional Aluminosilicate Nanomaterials Lab, Gubkin University, 119991 Moscow, Russia.
| | - Gölnur Fakhrullina
- Functional Aluminosilicate Nanomaterials Lab, Gubkin University, 119991 Moscow, Russia.
- Bionanotechnology Lab, Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia.
| | - Vadim Sangarov
- Functional Aluminosilicate Nanomaterials Lab, Gubkin University, 119991 Moscow, Russia.
| | - Yuri Lvov
- Institute for Micromanufacturing, Louisiana Tech University, Ruston, LA 71270, USA.
| | - Rawil Fakhrullin
- Bionanotechnology Lab, Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia.
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4
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Chakraborty S, Ramakrishnan S. Surface-Functionalized Polystyrene Latexes Using Itaconate-Based Surfmers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:11729-11737. [PMID: 30193459 DOI: 10.1021/acs.langmuir.8b01708] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Itaconic acid was readily transformed to a series of amphiphilic diesters via stepwise esterification of itaconic anhydride; the diesters carry one alkyl (cetyl or octyl) group and either a PEG, glyceryl, or dopamine segment. These diesters were used as surfmers for the preparation of polystyrene (PS) emulsions, with the expectation that the surface of the emulsion particles would carry PEG, glyceryl or dopamine units. NMR spectroscopic studies revealed that the surfmers were covalently incorporated into the polystyrene chains; furthermore, NMR tube polymerization experiments also confirmed that when the PEG surfmer was used, the PEG segments are indeed present on the surface of the emulsion particles. The size of the PEGlyated PS emulsions was readily varied from 35 to 140 nm by changing the mole fraction of surfmer used. In the case of the glyceryl and dopamine carrying surfmers, an octyl unit was used as the hydrophobic segment to ensure appropriate hydrophobic-hydrophilic balance; it was noticed that significantly larger mole fractions of the surfmers were required (15-20 mol %) to generate stable emulsions with particle sizes of about 150 nm. The PS emulsions carrying dopamine units on the surface were found to adhere to glass surfaces; thus suggesting that such "sticky" emulsion particles could be used to functionalize different types of surfaces. Finally, itaconate diesters bearing cetyl and perfluorooctyl segments were also prepared and shown to copolymerize with styrene to generate fluoroalkyl-enriched PS copolymers; these were used to generate hydrophobic coatings, with water contact angles of over 120°. Thus, itaconate-based surfmers are readily accessible alternatives for the preparation of emulsions with tailored size and surface functionality.
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Affiliation(s)
- Saheli Chakraborty
- Department of Inorganic and Physical Chemistry , Indian Institute of Science , Bangalore 560012 , India
| | - S Ramakrishnan
- Department of Inorganic and Physical Chemistry , Indian Institute of Science , Bangalore 560012 , India
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Li Y, Pi QM, You HH, Li JQ, Wang PC, Yang X, Wu Y. A smart multi-functional coating based on anti-pathogen micelles tethered with copper nanoparticlesviaa biosynthesis method usingl-vitamin C. RSC Adv 2018; 8:18272-18283. [PMID: 35541145 PMCID: PMC9080516 DOI: 10.1039/c8ra01985a] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Accepted: 05/13/2018] [Indexed: 01/29/2023] Open
Abstract
A multi-functional anti-pathogen coating with “release-killing”, “contact-killing” and “anti-adhesion” properties was prepared from biocompatible polymer encapsulated chlorine dioxide (ClO2) which protected the active ingredient from the outside environment.
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Affiliation(s)
- Yan Li
- Key Laboratory for Deep Processing of Major Grain and Oil (Wuhan Polytechnic University)
- Ministry of Education
- College of Food Science and Engineering
- Wuhan Polytechnic University
- Wuhan 430023
| | - Qing-meng Pi
- Department of Plastic and Reconstructive Surgery
- Renji Hospital
- Shanghai Jiaotong University School of Medicine
- Shanghai 200129
- P. R. China
| | - Hui-hui You
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology
- College of Life Sciences
- Central China Normal University
- Wuhan 430079
- P. R. China
| | - Jin-quan Li
- Brain and Cognitive Dysfunction Research Center
- School of Medicine
- Wuhan University of Science and Technology
- Wuhan 430081
- P. R. China
| | - Peng-cheng Wang
- Key Laboratory for Deep Processing of Major Grain and Oil (Wuhan Polytechnic University)
- Ministry of Education
- College of Food Science and Engineering
- Wuhan Polytechnic University
- Wuhan 430023
| | - Xu Yang
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology
- College of Life Sciences
- Central China Normal University
- Wuhan 430079
- P. R. China
| | - Yang Wu
- Key Laboratory for Deep Processing of Major Grain and Oil (Wuhan Polytechnic University)
- Ministry of Education
- College of Food Science and Engineering
- Wuhan Polytechnic University
- Wuhan 430023
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6
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Bhardwaj AK, Shukla A, Mishra RK, Singh SC, Mishra V, Uttam KN, Singh MP, Sharma S, Gopal R. Power and Time Dependent Microwave Assisted Fabrication of Silver Nanoparticles Decorated Cotton (SNDC) Fibers for Bacterial Decontamination. Front Microbiol 2017; 8:330. [PMID: 28316594 PMCID: PMC5334347 DOI: 10.3389/fmicb.2017.00330] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Accepted: 02/17/2017] [Indexed: 01/29/2023] Open
Abstract
Plasmonic nanoparticles (NPs) such as silver and gold have fascinating optical properties due to their enhanced optical sensitivity at a wavelength corresponding to their surface plasmon resonance (SPR) absorption. Present work deals with the fabrication of silver nanoparticles decorated cotton (SNDC) fibers as a cheap and efficient point of contact disinfectant. SNDC fibers were fabricated by a simple microwave assisted route. The microwave power and irradiation time were controlled to optimize size and density of silver nanoparticles (SNPs) on textile fibers. As prepared cotton fabric was characterized for ATR-FTIR, UV-VIS diffuse reflectance, SEM and TEM investigations. Size of SNPs as well as total density of silver atoms on fabric gets increased with the increase of microwave power from 100 W to 600 W. The antibacterial efficacy of SNPs extracted from SNDC fibers was found to be more effective against Gram-negative bacteria than Gram-positive bacteria with MIC 38.5 ± 0.93 μg/mL against Salmonella typhimurium MTCC-98 and 125 ± 2.12 μg/mL against Staphylococcus aureus MTCC-737, a linear correlation coefficient with R2 ranging from ∼0.928–0.935 was also observed. About >50% death cells were observed through Propidium Iodide (PI) internalization after treatment of SNPs extracted from SNDC fibers with concentration 31.25 μg/mL. Generation of ROS and free radical has also been observed which leads to cell death. Excellent Escherichia coli deactivation efficacy suggested that SNDC fibers could be used as potentially safe disinfectants for cleaning of medical equipment, hand, wound, water and preservation of food and beverages.
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Affiliation(s)
- Abhishek K Bhardwaj
- Centre for Environmental Science, University of AllahabadAllahabad, India; Laser Spectroscopy and Nanomaterials Lab., Department of Physics, University of AllahabadAllahabad, India
| | - Abhishek Shukla
- Laser Spectroscopy and Nanomaterials Lab., Department of Physics, University of Allahabad Allahabad, India
| | - Rohit K Mishra
- Centre for Medical Diagnostic and Research, Motilal Nehru National Institute of Technology Allahabad, India
| | - S C Singh
- Laser Spectroscopy and Nanomaterials Lab., Department of Physics, University of AllahabadAllahabad, India; High-Intensity Femtosecond Laser Laboratory, The Institute of Optics, University of RochesterRochester, NY, USA
| | - Vani Mishra
- Centre for Medical Diagnostic and Research, Motilal Nehru National Institute of Technology Allahabad, India
| | - K N Uttam
- Laser Spectroscopy and Nanomaterials Lab., Department of Physics, University of Allahabad Allahabad, India
| | - Mohan P Singh
- Centre of Biotechnology, University of Allahabad Allahabad, India
| | - Shivesh Sharma
- Centre for Medical Diagnostic and Research, Motilal Nehru National Institute of Technology Allahabad, India
| | - R Gopal
- Laser Spectroscopy and Nanomaterials Lab., Department of Physics, University of Allahabad Allahabad, India
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7
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Bai Z, Cristancho DE, Rachford AA, Reder AL, Williamson A, Grzesiak AL. Controlled Release of Antimicrobial ClO 2 Gas from a Two-Layer Polymeric Film System. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:8647-8652. [PMID: 27734667 DOI: 10.1021/acs.jafc.6b03875] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report a two-component label system comprising a chlorite-containing polymer film and an acid-containing polymer film that can release antimicrobial ClO2 gas upon adhering the two films together to enable a reaction of the chlorite and acid under moisture exposure. The chlorite-containing film comprises a commercial acrylate-based pressure-sensitive adhesive polymer impregnated with sodium chlorite. The acid-containing film comprises a commercial poly(vinyl alcohol) polymer loaded with tartaric acid. Both of the films were prepared on low ClO2-absorbing substrate films from stable aqueous systems of the polymers with high reagent loading. Rapid and sustained releases of significant amounts of ClO2 gas from the label system were observed in an in situ quantification system using UV-vis spectroscopy. It was found that the ClO2 release is slower at a lower temperature and can be accelerated by moisture in the atmosphere and the films. Controlled release of ClO2 gas from the label system was demonstrated by tailoring film composition and thickness. A model was developed to extract release kinetics and revealed good conversions of the label system. This two-component system can potentially be applied as a two-part label without premature release for applications in food packaging.
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Affiliation(s)
- Zhifeng Bai
- The Dow Chemical Company, Core Research and Development , 1702 Building, Midland, Michigan 48674, United States
| | - Diego E Cristancho
- The Dow Chemical Company, Core Research and Development , 2301 North Brazosport Boulevard, Freeport, Texas 77541, United States
| | - Aaron A Rachford
- The Dow Chemical Company, Core Research and Development , 1702 Building, Midland, Michigan 48674, United States
| | - Amy L Reder
- The Dow Chemical Company, Core Research and Development , 1702 Building, Midland, Michigan 48674, United States
| | - Alexander Williamson
- The Dow Chemical Company, Core Research and Development , 2301 North Brazosport Boulevard, Freeport, Texas 77541, United States
| | - Adam L Grzesiak
- The Dow Chemical Company, Core Research and Development , 1702 Building, Midland, Michigan 48674, United States
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8
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Balasubramanian K, Yadav R, Prajith P. Antibacterial nanofibers of polyoxymethylene/gold for pro-hygiene applications. ACTA ACUST UNITED AC 2016. [DOI: 10.1007/s12588-015-9127-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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9
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Song Y, Gao Y, Wan X, Luo F, Li J, Tan H, Fu Q. Dual-functional anticoagulant and antibacterial blend coatings based on gemini quaternary ammonium salt waterborne polyurethane and heparin. RSC Adv 2016. [DOI: 10.1039/c5ra27081b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
A simple design of the dual-functional anticoagulant and antibacterial blend coatings with controlled release of heparin.
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Affiliation(s)
- Yuanqing Song
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering Sichuan University
- Chengdu 610065
- China
| | - Yunlong Gao
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering Sichuan University
- Chengdu 610065
- China
- Research Institute for Strengthening Technology
| | - Xinyuan Wan
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering Sichuan University
- Chengdu 610065
- China
| | - Feng Luo
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering Sichuan University
- Chengdu 610065
- China
| | - Jiehua Li
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering Sichuan University
- Chengdu 610065
- China
| | - Hong Tan
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering Sichuan University
- Chengdu 610065
- China
| | - Qiang Fu
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering Sichuan University
- Chengdu 610065
- China
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10
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Sze‐To GN, Yang Y, Kwan JKC, Yu SCT, Chao CYH. Effects of surface material, ventilation, and human behavior on indirect contact transmission risk of respiratory infection. RISK ANALYSIS : AN OFFICIAL PUBLICATION OF THE SOCIETY FOR RISK ANALYSIS 2014; 34:818-30. [PMID: 24955468 PMCID: PMC7169243 DOI: 10.1111/risa.12144] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Infectious particles can be deposited on surfaces. Susceptible persons who contacted these contaminated surfaces may transfer the pathogens to their mucous membranes via hands, leading to a risk of respiratory infection. The exposure and infection risk contributed by this transmission route depend on indoor surface material, ventilation, and human behavior. In this study, quantitative infection risk assessments were used to compare the significances of these factors. The risks of three pathogens, influenza A virus, respiratory syncytial virus (RSV), and rhinovirus, in an aircraft cabin and in a hospital ward were assessed. Results showed that reducing the contact rate is relatively more effective than increasing the ventilation rate to lower the infection risk. Nonfabric surface materials were found to be much more favorable in the indirect contact transmission for RSV and rhinovirus than fabric surface materials. In the cases considered in this study, halving the ventilation rate and doubling the hand contact rate to surfaces and the hand contact rate to mucous membranes would increase the risk by 3.7-16.2%, 34.4-94.2%, and 24.1-117.7%, respectively. Contacting contaminated nonfabric surfaces may pose an indirect contact risk up to three orders of magnitude higher than that of contacting contaminated fabric surfaces. These findings provide more consideration for infection control and building environmental design.
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Affiliation(s)
- Gin Nam Sze‐To
- Building Energy Research CenterFok Ying Tung Graduate SchoolThe Hong Kong University of Science and TechnologyClear Water BayHong Kong
| | - Yang Yang
- Department of Mechanical and Aerospace EngineeringThe Hong Kong University of Science and TechnologyClear Water BayHong Kong
| | - Joseph K. C. Kwan
- Health, Safety and Environment OfficeThe Hong Kong University of Science and TechnologyClear Water BayHong Kong
- Division of EnvironmentThe Hong Kong University of Science and TechnologyClear Water BayHong Kong
| | - Samuel C. T. Yu
- Health, Safety and Environment OfficeThe Hong Kong University of Science and TechnologyClear Water BayHong Kong
- Division of EnvironmentThe Hong Kong University of Science and TechnologyClear Water BayHong Kong
| | - Christopher Y. H. Chao
- Building Energy Research CenterFok Ying Tung Graduate SchoolThe Hong Kong University of Science and TechnologyClear Water BayHong Kong
- Department of Mechanical and Aerospace EngineeringThe Hong Kong University of Science and TechnologyClear Water BayHong Kong
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11
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Dong A, Huang Z, Lan S, Wang Q, Bao S, Siriguleng, Zhang Y, Gao G, Liu F, Harnoode C. N-halamine-decorated polystyrene nanoparticles based on 5-allylbarbituric acid: From controllable fabrication to bactericidal evaluation. J Colloid Interface Sci 2014; 413:92-9. [DOI: 10.1016/j.jcis.2013.09.036] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Revised: 09/14/2013] [Accepted: 09/17/2013] [Indexed: 10/26/2022]
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12
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Agnihotri S, Mukherji S, Mukherji S. Immobilized silver nanoparticles enhance contact killing and show highest efficacy: elucidation of the mechanism of bactericidal action of silver. NANOSCALE 2013; 5:7328-40. [PMID: 23821237 DOI: 10.1039/c3nr00024a] [Citation(s) in RCA: 264] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Antimicrobial materials with immobilized/entrapped silver nanoparticles (AgNPs) are of considerable interest. There is significant debate on the mode of bactericidal action of AgNPs, and both contact killing and/or ion mediated killing have been proposed. In this study, AgNPs were immobilized on an amine-functionalized silica surface and their bactericidal activity was studied concurrently with the silver release profile over time. This was compared with similar studies performed using colloidal AgNPs and AgCl surfaces that released Ag ions. We conclude that contact killing is the predominant bactericidal mechanism and surface immobilized nanoparticles show greater efficacy than colloidal AgNPs, as well as a higher concentration of silver ions in solution. In addition, the AgNP immobilized substrate was used multiple times with good efficacy, indicating this immobilization protocol is effective for retaining AgNPs while maintaining their disinfection potential. The antibacterial surface was found to be extremely stable in aqueous medium and no significant leaching (∼1.15% of total silver deposited) of the AgNPs was observed. Thus, immobilization of AgNPs on a surface may promote reuse, reduce environmental risks associated with leaching of AgNPs and enhance cost effectiveness.
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Affiliation(s)
- Shekhar Agnihotri
- Centre for Research in Nanotechnology and Science, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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13
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Larson AM, Klibanov AM. Biocidal Packaging for Pharmaceuticals, Foods, and Other Perishables. Annu Rev Chem Biomol Eng 2013; 4:171-86. [DOI: 10.1146/annurev-chembioeng-061312-103253] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | - Alexander M. Klibanov
- Departments of 1Chemistry and
- Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139; ,
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14
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Jaiswal S, Bhattacharya K, Sullivan M, Walsh M, Creaven BS, Laffir F, Duffy B, McHale P. Non-cytotoxic antibacterial silver–coumarin complex doped sol–gel coatings. Colloids Surf B Biointerfaces 2013; 102:412-9. [DOI: 10.1016/j.colsurfb.2012.07.047] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Revised: 07/27/2012] [Accepted: 07/31/2012] [Indexed: 02/06/2023]
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15
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He S, Wang B, Chen H, Tang C, Feng Y. Preparation and antimicrobial properties of gemini surfactant-supported triiodide complex system. ACS APPLIED MATERIALS & INTERFACES 2012; 4:2116-2123. [PMID: 22404136 DOI: 10.1021/am300094f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Iodine is an effective, simple, and inexpensive bactericide in disinfection. However, the poor solubility and stability of iodine in water limit its applications. In addition, the active iodine content in the commercial iodophors is quite low, and the reported triiodide complex is unstable. In this work, a long-term stable triiodide complex antimicrobial system was prepared by mixing iodine and a cationic gemini surfactant into lauryldimethylamine oxide (LDAO) aqueous solution, and its stability was examined by means of UV-vis spectrophotometry. It was found that the content of LDAO, cationic gemini surfactant and H(2)SO(4) played crucial roles in stabilizing antimicrobial system, and the active iodine (i.e., triiodide complex) content of the optimum formulation can remain stable for 150 days, as iodine is encapsulated by the mixed vesicles assembled by the protonated LDAO and the added gemini surfactant. However, the active iodine reduced rapidly when NaCl was added or the pH was increased in the environment. Furthermore, the antimicrobial efficacy of the optimized formulation was studied against Candida albicans, and more than 4 log reduction in viable cell after 5 min of contact was obtained.
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Affiliation(s)
- Shuai He
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, People's Republic of China
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17
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Dong A, Lan S, Huang J, Wang T, Zhao T, Xiao L, Wang W, Zheng X, Liu F, Gao G, Chen Y. Modifying Fe3O4-functionalized nanoparticles with N-halamine and their magnetic/antibacterial properties. ACS APPLIED MATERIALS & INTERFACES 2011; 3:4228-4235. [PMID: 22008460 DOI: 10.1021/am200864p] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Magnetic/antibacterial bifunctional nanoparticles were fabricated through the immobilization of antibacterial N-halamine on silica-coated Fe(3)O(4)-decorated poly(styrene-co-acrylate acid) (PSA) nanoparticles. The samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS), X-ray diffraction (XRD), energy-dispersive X-ray spectrometry (EDX), Fourier transform infrared (FTIR), and thermogravimetric analysis (TGA). The N-halamine was developed from the precursor 5,5-dimethylhydantoin (DMH) by chlorination treatment, and experimental results showed that the loading amount of DMH on the silica-coated Fe(3)O(4)-decorated poly(styrene-co-acrylate acid) nanoparticles was adjustable. The as-synthesized nanoparticles exhibited superparamagnetic behavior and had a saturation magnetization of 18.93 emu g(-1). Antibacterial tests showed that the resultant nanoparticles displayed enhanced antibacterial activity against both Gram-positive and Gram-negative bacteria compared with their bulk counterparts.
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Affiliation(s)
- Alideertu Dong
- College of Chemistry, Jilin University and MacDiarmid Laboratory, Changchun 130021, People's Republic of China
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Farris S, Introzzi L, Biagioni P, Holz T, Schiraldi A, Piergiovanni L. Wetting of biopolymer coatings: contact angle kinetics and image analysis investigation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:7563-74. [PMID: 21619017 DOI: 10.1021/la2017006] [Citation(s) in RCA: 129] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
The surface wetting of five biopolymers, used as coating materials for a plastic film, was monitored over a span of 8 min by means of the optical contact angle technique. Because most of the total variation was observed to occur during the first 60 s, we decided to focus on this curtailed temporal window. Initial contact angle values (θ(0)) ranged from ∼91° for chitosan to ∼30° for pullulan. However, the water drop profile began to change immediately following drop deposition for all biocoatings, confirming that the concept of water contact angle equilibrium is not applicable to most biopolymers. First, a three-parameter decay equation [θ(t) = θ(0) exp(kt(n))] was fit to the experimental contact angle data to describe the kinetics of the contact angle change for each biocoating. Interestingly, the k constant correlated well with the contact angle evolution rate and the n exponent seemed to be somehow linked to the physicochemical phenomena underlying the overall kinetics process. Second, to achieve a reliable description of droplet evolution, the contact angle (CA) analysis was coupled with image analysis (IA) through a combined geometric/trigonometric approach. Absorption and spreading were the key factors governing the overall mechanism of surface wetting during the 60 s analysis, although the individual quantification of both phenomena demonstrated that spreading provided the largest contribution for all biopolymers, with the only exception of gelatin, which showed two quasi-equivalent and counterbalancing effects. The possible correlation between these two phenomena and the topography of the biopolymer surfaces are then discussed on the basis of atomic force microscopy analyses.
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Affiliation(s)
- Stefano Farris
- DiSTAM, Department of Food Science and Microbiology, University of Milan, Via Celoria 2 - 20133, Milan, Italy.
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Yao N, Lun Yeung K. Investigation of the performance of TiO 2 photocatalytic coatings. CHEMICAL ENGINEERING JOURNAL (LAUSANNE, SWITZERLAND : 1996) 2011; 167:13-21. [PMID: 32288622 PMCID: PMC7108342 DOI: 10.1016/j.cej.2010.11.061] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2010] [Revised: 11/15/2010] [Accepted: 11/17/2010] [Indexed: 05/27/2023]
Abstract
TiO2 photocatalysts were prepared and coated on surfaces. Ultrathin TiO2 coatings were obtained by wash-coating and screen-printing techniques. The latter provides films of excellent adhesion that could tolerate washing under water jet. The scratch-proof coatings were characterized, and X-ray diffraction (XRD), atomic force microscopy (AFM) and N2 physisorption indicated that the addition of polyethylene glycol (PEG) not only improved the coating properties of TiO2 but also served as poragen to produce high surface area, mesoporous TiO2. The coated TiO2 displayed better activity than the commercial P25 TiO2 for photocatalytic oxidation of ethylene, ethanol, acetaldehyde, isopropanol and acetone. The catalyst also exhibited excellent bactericidal, fungicidal and virucidal activities against a wide variety of Gram-positive and Gram-negative bacteria, fungal spores and T2 bacterial phage. A simple photoreactor with tangential air flow was designed and tested in a chamber, before incorporating in a prototype air purifier. The study showed that there is good agreement between laboratory catalyst reaction data (i.e., 110 mmol h-1 for acetone) and the prototype test results (69 mmol h-1).
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Affiliation(s)
| | - King Lun Yeung
- Corresponding author. Tel.: +852 2358 7123; fax: +852 2358 0054.
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