Journal of Membrane Science Letters最新文献_第8页

Characterizing surface porosity of porous membranes via contact angle measurements 通过接触角测量表征多孔膜的表面孔隙度

Journal of Membrane Science Letters Pub Date : 2022-05-01 DOI: 10.1016/j.memlet.2022.100022

Minhao Xiao , Fan Yang , Sungju Im , Derrick S. Dlamini , David Jassby , Shaily Mahendra , Ryo Honda , Eric M.V. Hoek

{"title":"Characterizing surface porosity of porous membranes via contact angle measurements","authors":"Minhao Xiao , Fan Yang , Sungju Im , Derrick S. Dlamini , David Jassby , Shaily Mahendra , Ryo Honda , Eric M.V. Hoek","doi":"10.1016/j.memlet.2022.100022","DOIUrl":"10.1016/j.memlet.2022.100022","url":null,"abstract":"<div>This investigation attempts to establish and verify a novel method for quantifying surface porosity of porous polymeric membranes via contact angle measurements. Herein, we fabricate a series of porous membranes via nonsolvent induced phase separation (NIPS) comprising different concentrations of polyvinylidene fluoride (PVDF) and PVDF-poly (methyl methacrylate) block co-polymer (PVDF-PMMA) with different concentrations of water and isopropyl alcohol (IPA) in the coagulation bath. Both sessile drop and captive bubble contact angle measurements are used to determine contact angles (and porosity) for both dry and wet membranes, respectively. The former method is probably applicable for membrane distillation, aeration and de-aeration where liquid water does not saturate the membrane, whereas the latter may be more indicative of pressure-driven aqueous membrane separations where the membrane is saturated through its cross-section. Image analysis of scanning electron microscope (SEM) images quantified dry membrane surface porosity. We propose a simple analytical model to obtain wet and dry membrane surface porosity from contact angle measurements. Our results suggest that the surface porosity calculated from both wet and dry contact angle data correlates strongly with the surface porosity calculated from SEM values. However, wet contact angles of the membranes with high porosities produce significantly higher porosity values, which also establishes the importance of porous membrane swelling in determining membrane porosity for aqueous membrane separations.</div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772421222000101/pdfft?md5=818cf854218af4133595bf0f3b3a3611&pid=1-s2.0-S2772421222000101-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78796765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Acoustically excited microstructure for on-demand fouling mitigation in a microfluidic membrane filtration device 微流控膜过滤装置中按需减少污垢的声激励微结构

Journal of Membrane Science Letters Pub Date : 2022-05-01 DOI: 10.1016/j.memlet.2021.100012

Kieran Fung , Yuekang Li , Shouhong Fan , Apresio Kefin Fajrial , Yifu Ding , Xiaoyun Ding

{"title":"Acoustically excited microstructure for on-demand fouling mitigation in a microfluidic membrane filtration device","authors":"Kieran Fung , Yuekang Li , Shouhong Fan , Apresio Kefin Fajrial , Yifu Ding , Xiaoyun Ding","doi":"10.1016/j.memlet.2021.100012","DOIUrl":"10.1016/j.memlet.2021.100012","url":null,"abstract":"<div>Membrane separation is widely used in food, pharmaceutical and water treatment industries but suffers a longstanding challenge of fouling. In this article, acoustically excited microstructures are demonstrated as a new mechanism to mitigate membrane fouling and remove cake layer aggregations formed on a microfluidic membrane-on-chip device. With acoustic streaming induced by oscillating microstructures near the membrane surface, cake layer fouling was effectively broken up and removed on the acoustofluidic membrane separation device within 100 milliseconds. The device is simple to fabricate and offers direct observation of crossflow microfiltration across the device membrane, giving valuable insight to particle fouling events often unobtainable in traditional membrane device configurations. The device bolsters advantages like label-free and reagent-free particle separation and in situ membrane cleaning during separation, providing a new mechanism for membrane separation applications used across industry.</div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S277242122100012X/pdfft?md5=531394a96b888d8f968e08457e0938ff&pid=1-s2.0-S277242122100012X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91538437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Sustainable nanofiltration membranes based on biosourced fully recyclable polyesters and green solvents 可持续纳滤膜基于生物来源的完全可回收聚酯和绿色溶剂

Journal of Membrane Science Letters Pub Date : 2022-05-01 DOI: 10.1016/j.memlet.2022.100016

Rifan Hardian , Robin M. Cywar , Eugene Y.-X. Chen , Gyorgy Szekely

引用次数: 16

New parametrization method for salt permeability of reverse osmosis desalination membranes 反渗透脱盐膜盐透性参数化新方法

Journal of Membrane Science Letters Pub Date : 2022-05-01 DOI: 10.1016/j.memlet.2021.100010

P.M. Biesheuvel , J.E. Dykstra , S. Porada , M. Elimelech

{"title":"New parametrization method for salt permeability of reverse osmosis desalination membranes","authors":"P.M. Biesheuvel , J.E. Dykstra , S. Porada , M. Elimelech","doi":"10.1016/j.memlet.2021.100010","DOIUrl":"10.1016/j.memlet.2021.100010","url":null,"abstract":"<div>Reverse osmosis (RO) is the most important membrane technology for the desalination of water. Measured water and salt fluxes are traditionally analyzed in the context of the solution-diffusion (SD) model which leads to a water permeability, A, and a salt permeability, B. However, this parametrization of the salt flux is not correct for water desalination by RO membranes, because these membranes show markedly different retentions for different feed salt concentrations, a classical observation in the literature, and this effect is not captured by the SD model. Thus, the traditional salt permeability B is not an intrinsic property of these membranes. We present a new analysis for desalination of a 1:1 salt, which follows from a transport theory that is based on the assumption that coions are strongly excluded from the membrane, and we demonstrate that it accurately describes a large dataset of salt retention by an RO membrane as function of pressure and feed salt concentration. This analysis leads to unique values of the water and salt permeabilities, A and <math><msup><mrow><mi>B</mi></mrow><mrow><mo>″</mo></mrow></msup></math>, not dependent on salt concentration or permeate water flux. Because we now have an improved parametrization, we can more accurately compare different membranes or study in more detail how membrane performance depends on conditions such as salt type and temperature. The new equation can provide guidance for the design of high-performance desalination membranes and for process modeling of desalination systems.</div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772421221000106/pdfft?md5=31548e8063aad337ee297ad916b979fd&pid=1-s2.0-S2772421221000106-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78525921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 25

Fouling-Resistant Membranes with Tunable Pore Size Fabricated Using Cross-Linkable Copolymers with High Zwitterion Content 用高两性离子含量的交联共聚物制备孔径可调的抗污膜

Journal of Membrane Science Letters Pub Date : 2022-05-01 DOI: 10.1016/j.memlet.2022.100019

Samuel J. Lounder, Patrick T. Wright, Luca Mazzaferro, Ayse Asatekin

引用次数: 4

Enhancing side chain swing ability by novel all-carbon twisted backbone for high performance anion exchange membrane at relatively low IEC level 新型全碳扭曲骨架在低IEC条件下增强高性能阴离子交换膜侧链摆动能力

Journal of Membrane Science Letters Pub Date : 2021-12-15 DOI: 10.1016/j.memlet.2021.100007

Huaqing Zhang, Yang Zhang, Fan Zhang, Xiaolin Ge, Wanjie Song, Chengpeng Wei, Liang Wu, Tongwen Xu

{"title":"Enhancing side chain swing ability by novel all-carbon twisted backbone for high performance anion exchange membrane at relatively low IEC level","authors":"Huaqing Zhang, Yang Zhang, Fan Zhang, Xiaolin Ge, Wanjie Song, Chengpeng Wei, Liang Wu, Tongwen Xu","doi":"10.1016/j.memlet.2021.100007","DOIUrl":"10.1016/j.memlet.2021.100007","url":null,"abstract":"<div>A novel all-carbon backbone-based membrane is designed by introducing side chains at the non-coplanar site of twisted “ether-free” main chain via Suzuki coupling reaction. The twisted backbone reduces the hindrance effect, providing broader mobile space for the side chains and enhancing the swing ability of the side chains to facilitate the formation of ion channels and the transportation of OH−. As a result, the high conductivity is obtained at a relatively low IEC level. The QPS-PB-4 membrane exhibits a superior OH− conductivity of 50.1 to 94.4 mS cm−1 at 30 ℃ to 80 ℃ with an IEC of only 1.48 mmol g−1, and a low swelling ratio of less than 10%. Which show significant advantage among the traditional side-chain-type AEMs reported in recent years. Moreover, the as-prepared membranes have good mechanical and thermal stability, as well as excellent chemical stability because of the all-carbon backbone designed without any sensitive sites that can be attacked by hydroxide. The conductivity of the QPS-PB-4 membrane decrease by only 8% after treatment at 80 ℃ in 1 M NaOH for 1800 h. The fuel cell assembled with the as-prepared membrane has a peak power density of up to 558.8 mW cm−², indicating the promising application potential of the membranes.</div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772421221000076/pdfft?md5=28842818e816ef95f1d97f90c4dccc07&pid=1-s2.0-S2772421221000076-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73540812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Tailored pore size and microporosity of covalent organic framework (COF) membranes for improved molecular separation 共价有机框架(COF)膜的定制孔径和微孔隙度，以改善分子分离

Journal of Membrane Science Letters Pub Date : 2021-12-15 DOI: 10.1016/j.memlet.2021.100008

Digambar B. Shinde , Li Cao , Xiaowei Liu , Dinga A.D. Wonanke , Zongyao Zhou , Mohamed N. Hedhili , Matthew Addicoat , Kuo-Wei Huang , Zhiping Lai

{"title":"Tailored pore size and microporosity of covalent organic framework (COF) membranes for improved molecular separation","authors":"Digambar B. Shinde , Li Cao , Xiaowei Liu , Dinga A.D. Wonanke , Zongyao Zhou , Mohamed N. Hedhili , Matthew Addicoat , Kuo-Wei Huang , Zhiping Lai","doi":"10.1016/j.memlet.2021.100008","DOIUrl":"10.1016/j.memlet.2021.100008","url":null,"abstract":"<div>Three crystalline truxene-based β-ketoenamine COF membranes (TFP-HETTA, TFP-HBTTA and TFP-HHTTA) are fabricated via a de novo monomer design approach to understand the fundamental correlations between pore structure and molecular separation performance. By introducing bulky alkyl groups into the truxene framework, the pore size of TFP-HETTA, TFP-HBTTA, and TFP-HHTTA are systematically tuned from 1.08 to 0.72 nm. Accordingly, the TFP-HETTA showed good water permeance of 47 L m−2 h−1 bar−1 along with a prominent rejection rate of Reactive Blue (RB, 800 Da) but less than 10% rejection rate of inorganic salts. In contrast, the TFP-HHTTA membrane with pore size of 0.72 nm can reject small dye molecules such as Safranin O (SO, 350 Da) and trivalent salts but with a moderate water permeance of 19 L m−2 h−1 bar−1. The pore-flow model rooted from the viscous flow could well fit the observed organic solvent nanofiltration results of all three COF membranes.</div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772421221000088/pdfft?md5=09c0c61dbe8632cbe9e8eefa796ff197&pid=1-s2.0-S2772421221000088-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83602574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

The role of skin layer defects in organic solvent reverse osmosis membranes 皮肤层缺陷在有机溶剂反渗透膜中的作用

Journal of Membrane Science Letters Pub Date : 2021-12-05 DOI: 10.1016/j.memlet.2021.100004

Hye Youn Jang, Ryan P. Lively

{"title":"The role of skin layer defects in organic solvent reverse osmosis membranes","authors":"Hye Youn Jang, Ryan P. Lively","doi":"10.1016/j.memlet.2021.100004","DOIUrl":"https://doi.org/10.1016/j.memlet.2021.100004","url":null,"abstract":"<div>The fractionation of complex liquid hydrocarbon mixtures is an important and emerging area of membrane science. Polymeric asymmetric hollow fiber membranes have the potential to be used for this purpose, especially if the size and number of defects in the membrane skin layer can be precisely engineered. Here, we fabricated various “defect-engineered” Torlon hollow fiber membranes by modifying hollow fiber spinning conditions and spin dopes to study the role of skin layer defects in the organic solvent reverse osmosis (OSRO) membranes. The quality of the membranes was investigated using several sets of pure gas permeation experiments, which provided input data for a permeation resistance model that estimates the pore size and surface porosity of the asymmetric hollow fiber membrane. We develop and experimentally validate a resistance permeation model for solvent permeation and utilize the surface properties derived from the gas permeation experiments to estimate the relative permeation rates of solvents in a mixture. The approach outlined here highlights the interconnection between gas permeation analysis and OSRO separation performance using Torlon hollow fiber membranes as an exemplar test case. The solvent permeation model is then utilized to provide quantitative insight on the differences between OSRO and organic solvent nanofiltration (OSN), and highlight the important transition region between these two modalities.</div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772421221000040/pdfft?md5=40acfae29ca8a578deca5f48f918124f&pid=1-s2.0-S2772421221000040-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137403257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Editorial to the first issue of the inaugural volume of Journal of Membrane Science Letters 《膜科学快报》杂志创刊号第一期社论

Journal of Membrane Science Letters Pub Date : 2021-12-05 DOI: 10.1016/j.memlet.2021.100006

Jerry Y.S. Lin , Rong Wang

引用次数: 0

Conformational-change-induced selectivity enhancement of CAU-10-PDC membrane for H2/CH4 and CO2/CH4 separation 构象变化诱导的cu -10- pdc膜对H2/CH4和CO2/CH4分离选择性增强

Journal of Membrane Science Letters Pub Date : 2021-12-05 DOI: 10.1016/j.memlet.2021.100005

Chung-Kai Chang , Hyun Jung Yu , Huiwon Jang , Ting-Hsiang Hung , Chung-Kai Chang , Jihan Kim , Jong Suk Lee , Dun-Yen Kang

{"title":"Conformational-change-induced selectivity enhancement of CAU-10-PDC membrane for H2/CH4 and CO2/CH4 separation","authors":"Chung-Kai Chang , Hyun Jung Yu , Huiwon Jang , Ting-Hsiang Hung , Chung-Kai Chang , Jihan Kim , Jong Suk Lee , Dun-Yen Kang","doi":"10.1016/j.memlet.2021.100005","DOIUrl":"10.1016/j.memlet.2021.100005","url":null,"abstract":"<div>The separation of H2/CH4 or CO2/CH4 is critical to the purification of natural gas. Herein, we report on novel membranes with a metal-organic framework of CAU-10-PDC for the separation of these two mixtures. The dense CAU-10-PDC membranes are fabricated on a porous alumina support using the seeded growth method. An unexpected increase in selectivity was observed while testing mixed gas permeation with either H2/CH4 or CO2/CH4 at a molar ratio of 50:50. Steady-state selectivity reached 101 for H2/CH4 and 62 for CO2/CH4. Ideal selectivity measured from single gas permeation reached 475 for H2/CH4 and 288 for CO2/CH4. Molecular dynamics simulations and time-resolved X-ray diffraction with a synchrotron radiation source were used to probe conformational changes in CAU-10-PDC induced by exposure to CH4. When exposed to an atmosphere containing CH4, CAU-10-PDC presented a change in the space group (from I41/amd to I41), which drastically reduced the pore limiting diameter from 4.15 to 2.95 Å, rendering the channel nearly impermeable to CH4.</div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772421221000052/pdfft?md5=bc88058c566daef3e0c02c1d2c0cc52a&pid=1-s2.0-S2772421221000052-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75831088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10