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Non-Solvent- and Temperature-Induced Phase Separations of Polylaurolactam Solutions in Benzyl Alcohol as Methods for Producing Microfiltration Membranes. COLLOIDS AND INTERFACES 2023. [DOI: 10.3390/colloids7010010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The possibility of obtaining porous films through solutions of polylaurolactam (PA12) in benzyl alcohol (BA) was considered. The theoretical calculation of the phase diagram showed the presence of the upper critical solution temperature (UCST) for the PA12/BA system at 157 °C. The PA12 completely dissolved in BA at higher temperatures, but the resulting solutions underwent phase separation upon cooling down to 120–140 °C because of the PA12’s crystallization. The viscosity of the 10–40% PA12 solutions increased according to a power law but remained low and did not exceed 5 Pa·s at 160 °C. Regardless of the concentration, PA12 formed a dispersed phase when its solutions were cooled, which did not allow for the obtention of strong films. On the contrary, the phase separation of the 20–30% PA12 solutions under the action of a non-solvent (isopropanol) leads to the formation of flexible microporous films. The measurement of the porosity, wettability, strength, permeability, and rejection of submicron particles showed the best results for a porous film produced from a 30% solution by non-solvent-induced phase separation. This process makes it possible to obtain a membrane material with a 240 nm particle rejection of 99.6% and a permeate flow of 1.5 kg/m2hbar for contaminated water and 69.9 kg/m2hbar for pure water.
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Ray SS, Soni R, Huyen DTT, Ravi S, Myung S, Lee CY, Kwon Y. Chemical engineering of electrospun
nanofibrous‐based three‐layered
nonwoven polymeric protective mask for enhanced performance. J Appl Polym Sci 2023. [DOI: 10.1002/app.53584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Saikat Sinha Ray
- Department of Urban and Environmental Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan South Korea
| | - Ritesh Soni
- School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan South Korea
| | - Dao Thi Thanh Huyen
- Department of Urban and Environmental Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan South Korea
| | - Srinath Ravi
- Department of Urban and Environmental Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan South Korea
| | - Suwan Myung
- Research Center for Bio‐based Chemistry Korea Research Institute of Chemical Technology (KRICT) Ulsan South Korea
| | - Chang Young Lee
- School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan South Korea
| | - Young‐Nam Kwon
- Department of Urban and Environmental Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan South Korea
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3
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PTFE porous membrane technology: A comprehensive review. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.121115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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4
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Ogbuoji EA, Zaky AM, Escobar IC. Advanced Research and Development of Face Masks and Respirators Pre and Post the Coronavirus Disease 2019 (COVID-19) Pandemic: A Critical Review. Polymers (Basel) 2021; 13:1998. [PMID: 34207184 PMCID: PMC8235328 DOI: 10.3390/polym13121998] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 06/11/2021] [Accepted: 06/11/2021] [Indexed: 12/05/2022] Open
Abstract
The outbreak of the COVID-19 pandemic, in 2020, has accelerated the need for personal protective equipment (PPE) masks as one of the methods to reduce and/or eliminate transmission of the coronavirus across communities. Despite the availability of different coronavirus vaccines, it is still recommended by the Center of Disease Control and Prevention (CDC), World Health Organization (WHO), and local authorities to apply public safety measures including maintaining social distancing and wearing face masks. This includes individuals who have been fully vaccinated. Remarkable increase in scientific studies, along with manufacturing-related research and development investigations, have been performed in an attempt to provide better PPE solutions during the pandemic. Recent literature has estimated the filtration efficiency (FE) of face masks and respirators shedding the light on specific targeted parameters that investigators can measure, detect, evaluate, and provide reliable data with consistent results. This review showed the variability in testing protocols and FE evaluation methods of different face mask materials and/or brands. In addition to the safety requirements needed to perform aerosol viral filtration tests, one of the main challenges researchers currently face is the inability to simulate or mimic true aerosol filtration scenarios via laboratory experiments, field tests, and in vitro/in vivo investigations. Moreover, the FE through the mask can be influenced by different filtration mechanisms, environmental parameters, filtration material properties, number of layers used, packing density, fiber charge density, fiber diameter, aerosol type and particle size, aerosol face velocity and concentration loadings, and infectious concentrations generated due to different human activities. These parameters are not fully understood and constrain the design, production, efficacy, and efficiency of face masks.
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Affiliation(s)
- Ebuka A. Ogbuoji
- Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USA;
| | - Amr M. Zaky
- BioMicrobics Inc., 16002 West 110th Street, Lenexa, KS 66219, USA;
| | - Isabel C. Escobar
- Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USA;
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Ray SS, Park YI, Park H, Nam SE, Kim IC, Kwon YN. Surface innovation to enhance anti-droplet and hydrophobic behavior of breathable compressed-polyurethane masks. ENVIRONMENTAL TECHNOLOGY & INNOVATION 2020; 20:101093. [PMID: 32835034 PMCID: PMC7410795 DOI: 10.1016/j.eti.2020.101093] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 08/03/2020] [Accepted: 08/03/2020] [Indexed: 05/09/2023]
Abstract
With the emergence of the coronavirus disease (COVID-19), it is essential that face masks demonstrating significant anti-droplet and hydrophobic characteristics are developed and distributed. In this study, a commercial compressed-polyurethane (C-PU) mask was modified by applying a hydrophobic and anti-droplet coating using a silica sol, which was formed by the hydrolysis of tetraethoxysilane (TEOS) under alkaline conditions and hydrolyzed hexadecyltrimethoxysilane (HDTMS) to achieve hydrophobization. The modified mask (C-PU/Si/HDTMS) demonstrated good water repellency resulting in high water contact angle (132°) and low sliding angle (17°). Unmodified and modified masks were characterized using attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). A drainage test confirmed the strong interaction between the mask surface and coating. Moreover, the coating had negligible effect on the average pore size of the C-PU mask, which retained its high breathability after modification. The application of this coating is a facile approach to impart anti-droplet, hydrophobic, and self-cleaning characteristics to C-PU masks.
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Affiliation(s)
- Saikat Sinha Ray
- School of Urban and Environmental Engineering (UEE), Ulsan National Institute of Science and Technology (UNIST), Republic of Korea
| | - You-In Park
- Membrane Research Center, Korea Research Institute of Chemical Technology, Daejeon, Republic of Korea
| | - Hosik Park
- Membrane Research Center, Korea Research Institute of Chemical Technology, Daejeon, Republic of Korea
| | - Seung-Eun Nam
- Membrane Research Center, Korea Research Institute of Chemical Technology, Daejeon, Republic of Korea
| | - In-Chul Kim
- Membrane Research Center, Korea Research Institute of Chemical Technology, Daejeon, Republic of Korea
| | - Young-Nam Kwon
- School of Urban and Environmental Engineering (UEE), Ulsan National Institute of Science and Technology (UNIST), Republic of Korea
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Cheng J, Huang Q, Huang Y, Luo W, Hu Q, Xiao C. Study on a novel PTFE membrane with regular geometric pore structures fabricated by near-field electrospinning, and its applications. J Memb Sci 2020. [DOI: 10.1016/j.memsci.2020.118014] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Ray SS, Lee HK, Kwon YN. Review on Blueprint of Designing Anti-Wetting Polymeric Membrane Surfaces for Enhanced Membrane Distillation Performance. Polymers (Basel) 2019; 12:E23. [PMID: 31877628 PMCID: PMC7023606 DOI: 10.3390/polym12010023] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Revised: 12/06/2019] [Accepted: 12/07/2019] [Indexed: 12/14/2022] Open
Abstract
Recently, membrane distillation (MD) has emerged as a versatile technology for treating saline water and industrial wastewater. However, the long-term use of MD wets the polymeric membrane and prevents the membrane from working as a semi-permeable barrier. Currently, the concept of antiwetting interfaces has been utilized for reducing the wetting issue of MD. This review paper discusses the fundamentals and roles of surface energy and hierarchical structures on both the hydrophobic characteristics and wetting tolerance of MD membranes. Designing stable antiwetting interfaces with their basic working principle is illustrated with high scientific discussions. The capability of antiwetting surfaces in terms of their self-cleaning properties has also been demonstrated. This comprehensive review paper can be utilized as the fundamental basis for developing antiwetting surfaces to minimize fouling, as well as the wetting issue in the MD process.
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Affiliation(s)
- Saikat Sinha Ray
- School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
| | - Hyung-Kae Lee
- School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
| | - Young-Nam Kwon
- School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
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Abdelrasoul A, Doan H, Lohi A, Cheng CH. Aquaporin-Based Biomimetic and Bioinspired Membranes for New Frontiers in Sustainable Water Treatment Technology: Approaches and Challenges. POLYMER SCIENCE SERIES A 2018. [DOI: 10.1134/s0965545x18040016] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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9
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Feng S, Zhong Z, Wang Y, Xing W, Drioli E. Progress and perspectives in PTFE membrane: Preparation, modification, and applications. J Memb Sci 2018. [DOI: 10.1016/j.memsci.2017.12.032] [Citation(s) in RCA: 106] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Ali AA, Haidar A, Polonskyi O, Faupel F, Abdul-Khaliq H, Veith M, Aktas OC. Extreme tuning of wetting on 1D nanostructures: from a superhydrophilic to a perfect hydrophobic surface. NANOSCALE 2017; 9:14814-14819. [PMID: 28971205 DOI: 10.1039/c7nr05336c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The tuning of wetting over an extreme range, from superhydrophilic to superhydrophobic, was demonstrated on 1D Al/Al2O3 nanostructures. While chaotic and tangled 1D Al/Al2O3 nanostructures exhibited complete wetting, they became water repellent (with a water contact angle (CA) ≥173°) after the infiltration of poly[bis(2,2,2-trifluoroethoxy)phosphazene] (PTFEP) solution. This simple strategy allows the achievement of two extreme wetting regimes, perfect wetting and non-wetting, without altering the nanostructured surface topography. The same surface was also found to exhibit repellency towards artificial blood and hexadecane.
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Affiliation(s)
- A A Ali
- INM-Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany
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11
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Preparation, characterization, and applications of electrospun ultrafine fibrous PTFE porous membranes. J Memb Sci 2017. [DOI: 10.1016/j.memsci.2016.10.019] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Xia L, Xian J, Liang N, Du A, Xin Z. Facile fabrication of a superhydrophobic surface from natural Eucommia
rubber. POLYM ADVAN TECHNOL 2017. [DOI: 10.1002/pat.4005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Lin Xia
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, School of Polymer Science and Engineering; Qingdao University of Science and Technology; Qingdao 266042 China
| | - Jiayu Xian
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, School of Polymer Science and Engineering; Qingdao University of Science and Technology; Qingdao 266042 China
| | - Ningning Liang
- Beijing National Laboratory for Molecular Sciences (BNLMS); Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
| | - Aihua Du
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, School of Polymer Science and Engineering; Qingdao University of Science and Technology; Qingdao 266042 China
| | - Zhenxiang Xin
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, School of Polymer Science and Engineering; Qingdao University of Science and Technology; Qingdao 266042 China
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Jiang F, Sun J, Yang R, Qiao S, An Z, Huang J, Mao H, Chen G, Ren Y. A facile approach to prepare a microporous polycarbazole P-tetra(4-(N-carbazolyl)phenyl)silane network with high CO2 storage and separation properties. NEW J CHEM 2016. [DOI: 10.1039/c5nj03215f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A facile approach to prepare a microporous polycarbazole P-TCzPhSi network by FeCl3 oxidative polymerization reaction.
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Affiliation(s)
- Fei Jiang
- School of Chemical and Environmental Engineering
- Shanghai Institute of Technology
- Shanghai 201418
- China
| | - Jianling Sun
- Beijing Municipal Research Institute of Environmental Protection
- Beijing 100037
- China
| | - Renqiang Yang
- CAS Key Laboratory of Bio-based Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao 266101
- China
| | - Shanlin Qiao
- CAS Key Laboratory of Bio-based Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao 266101
- China
| | - Zengjian An
- School of Chemical and Environmental Engineering
- Shanghai Institute of Technology
- Shanghai 201418
- China
| | - Jianqing Huang
- School of Chemical and Environmental Engineering
- Shanghai Institute of Technology
- Shanghai 201418
- China
| | - Haifang Mao
- School of Chemical and Environmental Engineering
- Shanghai Institute of Technology
- Shanghai 201418
- China
| | - Guie Chen
- School of Chemical and Environmental Engineering
- Shanghai Institute of Technology
- Shanghai 201418
- China
| | - Yujie Ren
- School of Chemical and Environmental Engineering
- Shanghai Institute of Technology
- Shanghai 201418
- China
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14
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Yan L, Chao M, Xiao J, Gao L, Wieβner S. Study on Preparation of BaSO4
-Containing Polytetrafluoroethylene Granular Powder. ADVANCES IN POLYMER TECHNOLOGY 2015. [DOI: 10.1002/adv.21623] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Luke Yan
- Polymer Materials & Chemistry Department; School of Materials Science & Engineering; Chang'an University; Xi'an 710064 People's Republic of China
- Leibniz Institute of Polymer Research Dresden; 01069 Dresden Germany
| | - Min Chao
- Polymer Materials & Chemistry Department; School of Materials Science & Engineering; Chang'an University; Xi'an 710064 People's Republic of China
| | - Jian Xiao
- Electronic Science & Technology Department; School of Electronics & Controls Engineering; Chang'an University; Xi'an 710064 People's Republic of China
| | - Lining Gao
- Polymer Materials & Chemistry Department; School of Materials Science & Engineering; Chang'an University; Xi'an 710064 People's Republic of China
| | - Sven Wieβner
- Leibniz Institute of Polymer Research Dresden; 01069 Dresden Germany
- Institute of Materials Science; Dresden University of Technology; 01069 Dresden Germany
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15
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Ahmad NA, Leo CP, Ahmad AL, Ramli WKW. Membranes with Great Hydrophobicity: A Review on Preparation and Characterization. SEPARATION AND PURIFICATION REVIEWS 2014. [DOI: 10.1080/15422119.2013.848816] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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