An omniphobic slippery membrane with simultaneous anti-wetting and anti-scaling properties for robust membrane distillation
This study may provide useful insights for material and structural design of MD membranes to treat wastewater with a complex composition.Graphical abstract (Source: Journal of Membrane Science)
Source: Journal of Membrane Science - October 18, 2019 Category: Materials Science Source Type: research

UiO-66-NH2 incorporated dual-layer hollow fibers made by immiscibility induced phase separation (I2PS) process for ethanol dehydration via pervaporation
Publication date: Available online 15 October 2019Source: Journal of Membrane ScienceAuthor(s): Yi Ming Xu, Susilo Japip, Tai-Shung ChungAbstractHigh performance dual-layer hollow fiber membranes have been developed for ethanol dehydration by incorporating a tiny amount (i.e., less than 0.3 wt%) of UiO-66-NH2 particles into cellulose triacetate (CTA)/Ultem® hollow fibers fabricated by the immiscibility induced phase separation (I2PS) process. Effects of particle loading, air gap, feed temperature, feed composition and heat treatment on membrane performance for ethanol dehydration were systematically studied. Positron...
Source: Journal of Membrane Science - October 16, 2019 Category: Materials Science Source Type: research

A new strategy to simultaneously improve the permeability and antifouling properties of EVAL membranes via surface segregation of macrocyclic supra-amphiphiles
Publication date: Available online 16 October 2019Source: Journal of Membrane ScienceAuthor(s): Sisi Ma, Ligang Lin, Qi Wang, Yuhui Zhang, Honglei Zhang, Yixin Gao, Fusheng Pan, Yuzhong ZhangAbstractHerein, we propose a new strategy to improve the flux and antifouling properties of ethylene vinyl alcohol (EVAL) membranes by blending with macrocyclic supra-amphiphiles (cyclodextrin; CD). The amphiphilic ‘molecular cage’ geometry of CD, consisting of a hydrophobic cavity segment and hydrophilic rim segment, induces spontaneous surface segregation of CD to form a CD-enriched layer on the membrane surface. The memb...
Source: Journal of Membrane Science - October 16, 2019 Category: Materials Science Source Type: research

Cysteamine-crosslinked graphene oxide membrane with enhanced hydrogen separation property
Publication date: Available online 14 October 2019Source: Journal of Membrane ScienceAuthor(s): Long Cheng, Kecheng Guan, Gongping Liu, Wanqin JinAbstractFor graphene oxide (GO) membranes, the repulsive forces between the carboxyl groups on GO nanosheets usually lead to an oversized interlayer height and thus low performance for precise molecular separation such as gas separation. Introducing new covalent bonding into the GO interlayer channels is an efficient approach to tune the channel height for improved size discrimination property. Herein, for the first time, we incorporated a small molecule, cysteamine with amino an...
Source: Journal of Membrane Science - October 15, 2019 Category: Materials Science Source Type: research

Advanced scalable zeolite “ions-sieving” composite membranes with high selectivity
Publication date: Available online 14 October 2019Source: Journal of Membrane ScienceAuthor(s): Qing Dai, Wenjing Lu, Yuyue Zhao, Huamin Zhang, Xiangxue Zhu, Xianfeng LiAbstractA zeolite composite membrane (ZCM) was designed and fabricated via a simple versatile and scalable method. A thin layer of ZSM-35 flakes with pore size between hydrated protons and vanadium ions was fixed on the poly(ether-sulfone)/sulfonated poly(ether-ether-ketone) (PES/SPEEK) porous substrate by in-situ interfacial polymerization. The ZSM flake layer can perfectly separate hydrated vanadium ions and protons, therefore, show very impressive perfor...
Source: Journal of Membrane Science - October 15, 2019 Category: Materials Science Source Type: research

Effects of relative humidity, particle hygroscopicity, and filter hydrophilicity on filtration performance of hollow fiber air filters
In this study, three types of hollow fibers were prepared: a hydrophilic PAN hollow fiber, a hydrophobic PVDF hollow fiber, and a dual layer PAN/PVDF hollow fiber. The three hollow fibers were used to filtrate nano-sized NaCl (hygroscopic) and Al2O3 (non-hygroscopic) particles at RH 80% and 40%. The results showed that the filtration efficiency was not affected by RH, particle hygroscopicity and filter hydrophilicity whereas the pressure drop across membranes was influenced significantly. When filtrating NaCl particles at RH80% that was higher than their deliquescent points, the PAN hollow fiber had a quick pressure drop i...
Source: Journal of Membrane Science - October 15, 2019 Category: Materials Science Source Type: research

Bacterial biofilm formation on ion exchange membranes
Publication date: Available online 12 October 2019Source: Journal of Membrane ScienceAuthor(s): Moshe Herzberg, Soumya Pandit, Meagan S. Mauter, Yoram OrenAbstractIon exchange membranes (IEMs) often suffer from biofouling, which reduces ion exchange rates and increases energy consumption in water treatment processes, such as electrodialysis, reverse electrodialysis, membrane capacitive deionization, and Donnan dialysis, and in energy devices, such as microbial fuel cells. In the present study, microbial biofilm formation was studied on anion exchange membranes (AEMs) and a cation exchange membranes (CEMs) of the homogeneou...
Source: Journal of Membrane Science - October 13, 2019 Category: Materials Science Source Type: research

Formation of asymmetric membrane by deposition of a hybrid sol-gel sublayer on top of a Langmuir film skin
We report the assembly of an asymmetric membrane consisting of octadecyltrimethoxysilane (ODTMS) Langmuir film covalently attached to a sol-gel based sublayer, supported by a mesoporous membrane. The ODTMS Langmuir film was compressed at the interface of a subphase containing tetramethoxysilane (TMOS), formamide and polyethylenimine. Exposure of the Langmuir film to NH3 vapours increased the pH at the interface (pHinterface) and catalysed the condensation of TMOS. The assembly of the layers was of a self-healing nature, due to the π-pressure set-up of the Langmuir film and the faster diffusion of the NH3 through the def...
Source: Journal of Membrane Science - October 13, 2019 Category: Materials Science Source Type: research

Engineering of oxygen pathways for better oxygen permeability in Cr-substituted Ba2In2O5 membranes
In this study, partial substitution of In3+ by Cr3+ yielded single-phase Ba2In2–xCrxO5–δ (x = 0, 0.2, 0.25). This forced an altered arrangement of the oxygen vacancies and a structural change from orthorhombic (Ibm2) to tetragonal (I4cm). The highest oxygen permeability of P(O2) = 1.4 ± 0.1 mL min−1·cm−2·mm at 1223 K among all tested samples was obtained for x = 0.2. A precise adjustment of the degree of oxygen vacancy ordering and the unit cell volume in this material reduced the activation energy EA and enhanced the self-diffusion coefficient D0 of ...
Source: Journal of Membrane Science - October 13, 2019 Category: Materials Science Source Type: research

Anion exchange membranes with dense N-spirocyclic cations as side-chain
Publication date: Available online 11 October 2019Source: Journal of Membrane ScienceAuthor(s): Fang Hua Liu, Qian Yang, Xue Lang Gao, Hong Yue Wu, Qiu Gen Zhang, Ai Mei Zhu, Qing Lin LiuAbstractTo prepare anion exchange membranes (AEMs) with high performances, we tethered the as-synthesized oligomers with dense N-spirocyclic cations (NS) as the side-chain to poly(ether sulfone) (PES). The steric hindrance of spirocyclic structure and electron-donating effect of alkyl spacers significantly enhance the stability of cations in harsh alkaline and high hydration conditions. Correspondingly, the ionic exchange capacity (IEC) of...
Source: Journal of Membrane Science - October 12, 2019 Category: Materials Science Source Type: research

Laser induced graphene /ceramic membrane composite: Preparation and characterization
Publication date: Available online 10 October 2019Source: Journal of Membrane ScienceAuthor(s): Mohamed Bayati, Haiming Peng, Heng Deng, Jian Lin, Maria Fidalgo de CortalezziAbstractIn this work, laser induced graphene (LIG) was successfully fabricated on microporous ceramic membranes. The surface area, morphology, and chemical characterizations were performed on the LIG layer. Water contact angle measurements showed the hydrophobicity of LIG. Pure water and solvents with different polarities were used to understand the solvent flux behavior of LIG membrane. The LIG membrane showed very high non-polar solvent fluxes and re...
Source: Journal of Membrane Science - October 12, 2019 Category: Materials Science Source Type: research

Improved water permeability and structural stability in a polysulfone-grafted graphene oxide composite membrane used for dye separation
This study provides a simple approach to enhancing the permeability and structural stability of GO-based membranes used for dye separation.Graphical abstract (Source: Journal of Membrane Science)
Source: Journal of Membrane Science - October 12, 2019 Category: Materials Science Source Type: research

Novel MOF-capped halloysite nanotubes/PDMS mixed matrix membranes for enhanced n-butanol permselective pervaporation
This study may shed light on the rational design of high-performance MMMs for biofuels recovery from fermentation broths.Graphical abstract (Source: Journal of Membrane Science)
Source: Journal of Membrane Science - October 12, 2019 Category: Materials Science Source Type: research

Bola-amphiphile-imidazole embedded GO membrane with enhanced solvent dehydration properties
Publication date: Available online 8 October 2019Source: Journal of Membrane ScienceAuthor(s): Yangyang Mao, Mengchen Zhang, Long Cheng, Jianwei Yuan, Gongping Liu, Libo Huang, Mihail Barboiu, Wanqin JinAbstractInspired by fast and selective water transport in natural Aquaporin (AQP), imidazole-quartet water channels (IQWC) constructed by imidazole-ureido (IU) molecular scaffolds, are excellent candidates to design membranes with fast and selective water transport properties. In this work, a water binding IU bola-amphiphile-imidazole compound was embedded with the hydrophilic and laminated graphene oxide (GO) to prepare IU...
Source: Journal of Membrane Science - October 10, 2019 Category: Materials Science Source Type: research

Decoupling the mechanical strength and ionic conductivity of an ionogel polymer electrolyte for realizing thermally stable lithium-ion batteries
Publication date: Available online 9 October 2019Source: Journal of Membrane ScienceAuthor(s): Yun Yang, Qian Wu, Dong Wang, Chenchong Ma, Zheng Chen, Caizhen Zhu, Yuan Gao, Cuihua LiAbstractGel electrolytes are promising candidates for fulfilling the performance and safety requirements of a new generation of lithium-ion battery technologies owing to their quasi-solid-state and ameliorated mechanical strength. However, there is a dilemma that requires the sacrifice of the ionic conductivity in exchange for mechanical strength. Here, a mechanically robust ionogel polymer electrolyte (IGPE) is explored to overcome this pligh...
Source: Journal of Membrane Science - October 10, 2019 Category: Materials Science Source Type: research

Fabrication of a super hydrophobic polyvinylidene fluoride–hexadecyltrimethoxysilane hybrid membrane for carbon dioxide absorption in a membrane contactor
Publication date: Available online 9 October 2019Source: Journal of Membrane ScienceAuthor(s): Honglei Pang, Zezhi Chen, Huijuan Gong, Mengfan DuAbstractTo obtain a super hydrophobic hollow fiber membrane for using in membrane contact absorption of carbon dioxide (CO2), hybrid polyvinylidene fluoride-hexadecyltrimethoxysilane (PVDF–HDTMS) membranes were fabricated via the non-solvent induced phase-inversion method with ammonia water as the non-solvent additive and dehydrofluorination reagent, and HDTMS as the hydrophobic modifier. The membranes exhibited super-hydrophobicity which was attributed to the formation of r...
Source: Journal of Membrane Science - October 10, 2019 Category: Materials Science Source Type: research

Effect of hexafluoroisopropylidene group contents and treatment temperature on the performance of thermally rearranged poly(hydroxyamide)s membranes
Publication date: Available online 9 October 2019Source: Journal of Membrane ScienceAuthor(s): Lu Ye, Lina Wang, Xingming Jie, Congyao Yu, Guodong Kang, Yiming CaoAbstractSoluble aromatic polyamide films were prepared with different molar ratios of 2,2′-bis(3-amino-4-hydroxyphenyl) hexafluoropropane (APAF) and 3,3′-dihydroxy-4,4′-diaminobiphenyl (HAB), and then in-situ treated at different temperature to obtain thermally rearranged polybenzoxazole (TR-PBO) membranes with ultra-high gas permeability. Compared to polyamide precursors, the obtained TR-PBO membranes exhibited bimodal cavity distribution. The ...
Source: Journal of Membrane Science - October 10, 2019 Category: Materials Science Source Type: research

Molecular simulation of diffusion behavior of counterions within polyelectrolyte membranes used in electrodialysis
Publication date: Available online 9 October 2019Source: Journal of Membrane ScienceAuthor(s): Shu-Ying Sun, Xiao-Yao Nie, Jun Huang, Jian-Guo YuAbstractA molecular dynamics simulation was performed to explore the diffusion behavior of counter-ions within polyelectrolyte membranes via Materials Studio software, which could provide a theoretical basis for the screening and performance prediction of selective ion-exchange membranes (IEMs). The mean square displacements of Li+/Mg2+ in sulfonic and phosphatic polyelectrolyte systems were calculated, and the sulfonic group was determined as a higher preference fixed charge grou...
Source: Journal of Membrane Science - October 10, 2019 Category: Materials Science Source Type: research

Dimensionally-controlled densification in crosslinked thermally rearranged (XTR) hollow fiber membranes for CO2 capture
Publication date: Available online 9 October 2019Source: Journal of Membrane ScienceAuthor(s): Jongmyeong Lee, Ju Sung Kim, Su-young Moon, Chae Young Park, Jeong F. Kim, Young Moo LeeAbstractThermal densification in asymmetric hollow fibers fabricated using thermally rearranged (TR) polymers has been regarded as a challenging issue due to productivity reduction by severe permeance loss. However, it has recently been reported from our group that the densification phenomenon could be exploited to induce ultrathin skin layer from highly porous precursor fibers. We successfully prepared densification-induced crosslinked therma...
Source: Journal of Membrane Science - October 10, 2019 Category: Materials Science Source Type: research

Ultra-light cellulose nanofibril membrane for lithium-ion batteries
This study indicates the alluring prospect of applying cellulose nanofibril membranes into ultra-light-thin lithium-ion batteries. (Source: Journal of Membrane Science)
Source: Journal of Membrane Science - October 10, 2019 Category: Materials Science Source Type: research

Dilute solvent welding: A quick and scalable approach for enhancing the mechanical properties and narrowing the pore size distribution of electrospun nanofibrous membrane
This study describes a quick and scalable method to improve the mechanical properties and narrow the pore size distribution of nanofibrous membranes by welding the nanofibers at their junction points. The welding process involves a simple dilute solvent spraying step followed by heating, requiring only a few minutes. The polymer's solvent was diluted with a non-solvent to avoid excessive dissolution of the nanofibers. With that, the degree of welding can be controlled by the volume fraction of solvent, the heating temperature and heating temperature. Dilute solvent welding enhanced the mechanical properties of the nanofibr...
Source: Journal of Membrane Science - October 10, 2019 Category: Materials Science Source Type: research

Molecular branching as a simple approach to improving polymer electrolyte membranes
Publication date: Available online 9 October 2019Source: Journal of Membrane ScienceAuthor(s): Michael Adamski, Thomas J.G. Skalski, Eric M. Schibli, Miho Killer, Yang Wu, Nicolas Peressin, Barbara J. Frisken, Steven HoldcroftAbstractA series of branched, sulfonated, phenylated poly(phenylene)s were synthesized by introduction of varying molar ratios of trifunctional monomer into the polymerization mixture. The branched polymers, containing between 0.25 and 2.00 mol% molecular branching, were cast into membranes and comprehensively characterized as polymer electrolyte membranes. Comparison to a linear, unbranched polymer...
Source: Journal of Membrane Science - October 10, 2019 Category: Materials Science Source Type: research

Enhanced monovalent selectivity of cation exchange membranes via adjustable charge density on functional layers
Publication date: Available online 9 October 2019Source: Journal of Membrane ScienceAuthor(s): Xiao Pang, Yanyao Tao, Yanqing Xu, Jiefeng Pan, Jiangnan Shen, Congjie GaoAbstractElectrodialysis (ED) technique is a typical and promising membrane process, for applications like water treatment and ion separation. Especially, the separation between monovalent and multivalent cations is a current central issue in many industries and academic researches. Herein, a series of novel cation exchange membranes were prepared from quaternized polyaniline modified sulfonated polyphenyl sulfone (SPPSU) by in-situ polymerization-deposited ...
Source: Journal of Membrane Science - October 10, 2019 Category: Materials Science Source Type: research

Separation behavior of amorphous amino-modified silica nanoparticle/polyimide mixed matrix membranes for gas separation
Publication date: Available online 9 October 2019Source: Journal of Membrane ScienceAuthor(s): Chien-Chieh Hu, Po-Hsiu Cheng, Shang-Chih Chou, Cheng-Lee Lai, Shu-Hsein Huang, Hui-An Tsai, Wei-Song Hung, Kueir-Rarn LeeAbstractIn this work, amorphous amino-modified silica nanoparticles (AAMSN) were successfully synthesized via the sol-gel method and combined with the polyimide (PI) 4,4′-oxydiphthalic anhydride-2,2′-bis(trifluoromethyl) benzidine (ODPA-TFMB) to prepare mixed matrix membranes (MMMs) for gas separation. The physicochemical properties of the AAMSNs were characterized by thermogravimetric analysis, X-...
Source: Journal of Membrane Science - October 10, 2019 Category: Materials Science Source Type: research

Alleviating reverse osmosis membrane fouling caused by biopolymers using pre-ozonation
Publication date: Available online 9 October 2019Source: Journal of Membrane ScienceAuthor(s): Zhonglong Yin, Tiancheng Wen, Yan Li Aimin, Li, Chao LongAbstractPre-ozonation prior to membrane filtration was widely investigated for the mitigation of membrane fouling by biopolymers, nevertheless, the application of ozone pre-treatment on reverse osmosis (RO) membrane is limited. In this work, bovine serum albumin (BSA) and sodium alginate (SA) were selected as representatives of protein and polysaccharides, respectively. RO fouling by BSA, SA and BSA + SA (weight ratio = 1:1) solutions was investigated be...
Source: Journal of Membrane Science - October 10, 2019 Category: Materials Science Source Type: research

Blend anion exchange membranes containing polymer of intrinsic microporosity for fuel cell application
Publication date: Available online 9 October 2019Source: Journal of Membrane ScienceAuthor(s): Shoutao Gong, Lv Li, Lingling Ma, Naeem Akhtar Qaisrani, Jiafei Liu, Gaohong He, Fengxiang ZhangAbstractHigh hydroxide conductivity and alkali resistance of anion exchange membranes (AEMs) is the basic requirement for realizing the practical application of anion exchange membrane fuel cells. In this work, we develop a novel blend AEM incorporating polymer of intrinsic microporosity (PIM). PIM features highly rigid backbone and loose packing so that the resultant blend AEM containing PIM possesses increased free volume so that the...
Source: Journal of Membrane Science - October 10, 2019 Category: Materials Science Source Type: research

Design of Nb-based multi-phase alloy membranes for high hydrogen permeability and suppressed hydrogen embrittlement
Publication date: Available online 7 October 2019Source: Journal of Membrane ScienceAuthor(s): Erhu Yan, R.N. Min, P. Zhao, R.D.K. Misra, P.R. Huang, Y. Zou, H.L. Chu, H.Z. Zhang, F. Xu, L.X. SunAbstractNb-Hf-Co alloys, consisting of a multi-phase microstructure with primary BCC-(Nb, Hf) and eutectic {BCC-(Nb, Hf) + HfCo} phases, are a potential alloys for hydrogen separation and purification. However, the compositional window, comprising of the above phases, has not yet been established because of lack of important information concerning the phase diagrams. To address this need, this study first calculated the p...
Source: Journal of Membrane Science - October 9, 2019 Category: Materials Science Source Type: research

Mutual influence in permeation of CO2-containing mixtures through a SAPO-34 membrane
Publication date: Available online 7 October 2019Source: Journal of Membrane ScienceAuthor(s): Pasquale Francesco Zito, Adele Brunetti, Alessio Caravella, Enrico Drioli, Giuseppe BarbieriAbstractThe presence of adsorbed CO2 significantly affects the permeation of weakly adsorbed species in zeolite membranes. At the same time, CO2 is itself influenced by the presence of another component, deviating its permeation with respect to the single-gas condition. In this work, we investigated the mutual interaction between CO2 and the other permeating gases through SAPO-34 zeolite membranes for several binary mixtures with H2, N2 or...
Source: Journal of Membrane Science - October 9, 2019 Category: Materials Science Source Type: research

Diffusion coefficient of solute in heterogeneous and macroporous hydrogels and its correlation with the effective crosslinking density
In this study, the effective crosslinking density, νe, was determined from the rubber network theory using compression tests, and was applied as a model parameter for the characterization of the polymer networks and gel structures. It was subsequently examined to estimate Dg for various types of gels, including heterogeneous and macroporous gels. The Dg values of NaCl and trisodium citrate were determined with a permeability test using the gel membrane. The diffusion of the solute in all the tested gels was accurately represented by both conventional (Dg/D0 = exp(-kϕpn)) and novel (Dg/D0 = exp(-aνeb)) models...
Source: Journal of Membrane Science - October 9, 2019 Category: Materials Science Source Type: research

Few-layers MoS2 nanosheets modified thin film composite nanofiltration membranes with improved separation performance
Publication date: Available online 7 October 2019Source: Journal of Membrane ScienceAuthor(s): Shishi Yang, Kaisong ZhangAbstractTwo-dimensional (2D) molybdenum disulfide (MoS2) nanosheets materials with excellent properties provide a new possibility and approach for designing nanofiltration (NF) membranes with overcoming the “trade-off” phenomenon of permselectivity. Few-layers of 2D MoS2 were synthesized by a facile solvent-assisted ultrasonic exfoliation method. A novel nanocomposite NF membrane was fabricated through interfacial polymerization by addition of the as-prepared MoS2 nanosheets into the organic ...
Source: Journal of Membrane Science - October 9, 2019 Category: Materials Science Source Type: research

Poly(ethylene oxide)-based composite solid polymer electrolyte containing Li7La3Zr2O12 and poly(ethylene glycol) dimethyl ether
Publication date: Available online 8 October 2019Source: Journal of Membrane ScienceAuthor(s): Ji Hye Cha, Pravin N. Didwal, Ju Min Kim, Duck Rye Chang, Chan-Jin ParkAbstractWe have synthesized a self-standing, flexible, highly ion conductive, and electrochemically stable composite solid polymer electrolyte (CSPE) composed of a poly(ethylene oxide) matrix, Li7La3Zr2O12 ceramic filler, and poly(ethylene glycol) dimethyl ether (PEGDME) plasticizer for all-solid-state Li-ion batteries. The CSPE containing 10 wt% PEGDME (CSPE10) shows the highest ionic conductivity of 4.7 × 10-4 S cm-1 at 60 °C. Additionally,...
Source: Journal of Membrane Science - October 9, 2019 Category: Materials Science Source Type: research

Covalent triazine frameworks membrane with highly ordered skeleton nanopores for robust and precise molecule/ion separation
Publication date: Available online 5 October 2019Source: Journal of Membrane ScienceAuthor(s): Guiliang Li, Wen Wang, Qile Fang, Fu LiuAbstractTwo dimensional covalent triazine frameworks (2D-CTF) with controlled pore size and stable structure are a new class of 2D building blocks for constructing separation membrane materials. In this work, we synthesize few-layer 2D-CTF-1 nanosheets with high crystallinity and excellent solvent dispersion using a micro-interface method. The as-prepared 2D-CTF-1 membrane via filtration assembly of few-layer 2D-CTF-1 nanosheets exhibits superior permeability due to its ultralow solvent-int...
Source: Journal of Membrane Science - October 6, 2019 Category: Materials Science Source Type: research

Unconventional hydrogen permeation behavior of Pd/BCC composite membranes and significance of surface reaction kinetics
This study questions the validity of previous permeability trends of the Pd/BCC composite membranes and reveals the importance of surface reactions that significantly affect the permeation behavior of such membranes. A new permeation model developed, considering both the surface reactions at the catalytic layers and bulk diffusion through the metal layers, exhibits good correlation with the experimental permeation characteristics of the Pd/BCC composite membranes. Moreover, the diffusivity coefficients of BCC metals as a function of temperature is determined with higher accuracy than that measured in previous studies havin...
Source: Journal of Membrane Science - October 6, 2019 Category: Materials Science Source Type: research

Addition-type alkoxysilyl-substituted polynorbornenes for post-combustion carbon dioxide separations
Publication date: Available online 4 October 2019Source: Journal of Membrane ScienceAuthor(s): Christopher R. Maroon, Jacob Townsend, Morgan A. Higgins, Daniel J. Harrigan, Benjamin J. Sundell, John A. Lawrence, Jeremy T. O'Brien, Dylan O'Neal, Konstantinos D. Vogiatzis, Brian K. LongAbstractThe separation of CO2 from N2 using polymeric membranes has proven a particularly challenging task. One promising class of polymers for this application is alkoxysilyl-substituted vinyl-added polynorbornenes (VAPNBs), which are high Tg materials that often exhibit notable CO2/N2 separation performance. This performance is believed to a...
Source: Journal of Membrane Science - October 6, 2019 Category: Materials Science Source Type: research

Highly selective composite membranes using ladder-like structured polysilsesquioxane for a non-aqueous redox flow battery
Publication date: Available online 4 October 2019Source: Journal of Membrane ScienceAuthor(s): Jiyoon Jung, Jongok Won, Seung Sang HwangAbstractNanoporous composite membranes coated on the microporous support with a ladder-like ionic polymer were prepared and the structural selectivity effect of the membrane on a non-aqueous vanadium redox flow battery (RFB) was investigated. Crosslinkable ladder-like ionic polysilsesquioxane (L-PSQ) was synthesized and a Celgard 2400 membrane was used for the support. An L-PSQ/Celgard composite membrane was prepared by the thermal crosslinking reaction of crosslinkable L-PSQ after the dip...
Source: Journal of Membrane Science - October 6, 2019 Category: Materials Science Source Type: research

Improved anti-biofouling performance of polyamide reverse osmosis membranes modified with a polyampholyte with effective carboxyl anion and quaternary ammonium cation ratio
Publication date: Available online 4 October 2019Source: Journal of Membrane ScienceAuthor(s): Zhe Yang, Daisuke Saeki, Ryosuke Takagi, Hideto MatsuyamaAbstractBiofouling is a serious problem in reverse osmosis (RO) membrane processes. In this paper, a polyamide RO membrane was modified with a polyampholyte composed of anionic 2-carboxyethyl acrylate (CAA) and cationic [2-(acryloyloxy)ethyl] trimethyl ammonium chloride (TMA) by surface-initiated atom transfer radical polymerization, in order to improve its anti-biofouling properties. The anti-biofouling properties of membranes with different CAA/TMA surface ratios were eva...
Source: Journal of Membrane Science - October 6, 2019 Category: Materials Science Source Type: research

Novel CO2-tolerant dual-phase Ce0.9Pr0.1O2–δ - La0.5Sr0.5Fe0.9Cu0.1O3–δ membranes with high oxygen permeability
Publication date: Available online 3 October 2019Source: Journal of Membrane ScienceAuthor(s): Guoxing Chen, Binjie Tang, Marc Widenmeyer, Ling Wang, Armin Feldhoff, Anke WeidenkaffAbstractA series of novel dense, CO2-tolerant, oxygen permeable, dual-phase membranes made of Ce0.9Pr0.1O2–δ - La0.5Sr0.5Fe0.9Cu0.1O3–δ (CPO-LSFCO) with different CPO: LSFCO weight ratios (2:8, 4:6, 6:4 and 8:2) was prepared by an one-pot EDTA-citric acid method. Their chemical compatibility, oxygen permeability, CO2 tolerance and long-term stability regarding the phase structure and composition in different atmospheres w...
Source: Journal of Membrane Science - October 5, 2019 Category: Materials Science Source Type: research

Combining tannic acid-modified support and a green co-solvent for high performance reverse osmosis membranes
Publication date: Available online 1 October 2019Source: Journal of Membrane ScienceAuthor(s): Mengqi Shi, Wentao Yan, Yong Zhou, Zhi Wang, Lifen Liu, Song Zhao, Yanli Ji, Jixiao Wang, Congjie Gao, Peng Zhang, Xingzhong CaoAbstractIn this work, a support modified by tannic acid (TA) and a green co-solvent (dimethyl carbonate (DMC)) were used jointly to prepare high performance polyamide (PA) reverse osmosis (RO) membranes. The membrane characterization results showed that (1) the leaf-like structure became more pronounced on the membrane surface owing to the addition of DMC and (2) TA made the PA active layer thinner and d...
Source: Journal of Membrane Science - October 2, 2019 Category: Materials Science Source Type: research

Coaxial electrospun sulfonated poly (ether ether ketone) proton exchange membrane for conductivity-strength balance
Publication date: Available online 1 October 2019Source: Journal of Membrane ScienceAuthor(s): Qianqian Yuan, Zheng Fu, Yunqing Wan, Wanting Chen, Xuemei Wu, Xue Gong, Dongxing Zhen, Xigao Jian, Gaohong HeAbstractCoaxial electrospun strategy is proposed to resolve the typical conductivity-strength dilemma of proton exchange membrane and then improve performance of fuel cell. The advantages of co-electrospinning and effects of coaxial components are demonstrated through a simple design of co-electrospun nanofibers, i.e. sulfonated poly(ether ether ketone) with different degree of sulfonation for the core and shell component...
Source: Journal of Membrane Science - October 2, 2019 Category: Materials Science Source Type: research

The structure and properties of poly(vinylidene fluoride)/ultrahigh-molecular -weight polyethylene blend hollow fiber membranes via TIPS with mixed diluents
Publication date: Available online 1 October 2019Source: Journal of Membrane ScienceAuthor(s): Nana Li, Qingchen Lu, Weiwei Yin, Changfa Xiao, Jialu LiAbstractTo synchronously improve mechanical properties and permeability of poly (vinylidene fluoride) (PVDF) membranes, PVDF/ultrahigh-molecular-weight polyethylene (UHMWPE) blending hollow fiber membranes were prepared by a thermally induced phase separation method, with mineral oil and dibutyl phthalate as mixed diluents. To study the fluidity, phase separation and crystallization behavior of the membrane-forming system, the element distribution state, morphology and pore ...
Source: Journal of Membrane Science - October 2, 2019 Category: Materials Science Source Type: research

Dual hydrophobic modifications toward anion exchange membranes with both high ion conductivity and excellent dimensional stability
Publication date: Available online 28 September 2019Source: Journal of Membrane ScienceAuthor(s): Chuan Hu, Qiugen Zhang, Hongyue Wu, Xiuli Deng, Qian Yang, Peng Liu, Yanzhen Hong, Aimei Zhu, Qinglin LiuAbstractAnion exchange membrane (AEMs) as a kind of important functional material are widely used in many fields including fuel cell, electrodialysis and water treatment. However, synthetic AEMs generally suffer a pernicious trade-off: high ion-conductive AEMs lack dimensional stability and vice versa. Herein we demonstrate a versatile strategy to prepare the AEMs with both high ion conductivity and excellent dimensional st...
Source: Journal of Membrane Science - September 29, 2019 Category: Materials Science Source Type: research

Controlled pore collapse to increase solute rejection of modified PES membranes
Publication date: Available online 28 September 2019Source: Journal of Membrane ScienceAuthor(s): Libor Zverina, Marcus Koch, Mads F. Andersen, Manuel Pinelo, John M. Woodley, Anders E. DaugaardAbstractPore collapse upon drying is a well-known phenomenon in ultrafiltration PES membranes. Here we demonstrate how alteration of membrane surface chemistry can be used to control the extent of pore collapse and ultimately to tailor membrane properties. Commercial hollow-fiber PES membranes were modified via surface-initiated ATRP to obtain different polymer-grafted membranes and were subsequently dried to facilitate pore collaps...
Source: Journal of Membrane Science - September 29, 2019 Category: Materials Science Source Type: research

The first operating thermolytic reverse electrodialysis heat engine
Publication date: Available online 28 September 2019Source: Journal of Membrane ScienceAuthor(s): F. Giacalone, F. Vassallo, F. Scargiali, A. Tamburini, A. Cipollina, G. MicaleAbstractThermolytic reverse electrodialysis heat engine (t-RED HE) has been recently proposed as a technology for converting low-temperature waste heat into electricity. The construction and operation of the first world lab-scale prototype unit are reported. The system consists of: (i) a reverse electrodialysis unit where, the concentration gradient between two solutions of thermolytic salts is converted into electricity and (ii) a thermally-driven r...
Source: Journal of Membrane Science - September 29, 2019 Category: Materials Science Source Type: research

Dendrite-free cross-link network using bio-inspired ion-conducting membrane
Publication date: Available online 27 September 2019Source: Journal of Membrane ScienceAuthor(s): Seung-Young Choi, Ho-Yeon Lee, Chan-Hyuk Ji, Hee-Woo Rhee, Rahul SinghAbstractThe selectivity and compatibility of ions and matrix are fundamental requirements for achieving remarkable strong structural and outstanding electrical properties. Molecular engineering of 3D crosslink network led to form a stable ion conducting membrane for the commercial standard. In this article, we developed a biocompatible, transparent, flexible and thermally stable ion conducting membranes for an electrochemical application. Structural, thermal...
Source: Journal of Membrane Science - September 28, 2019 Category: Materials Science Source Type: research

Proton exchange membranes with cross-linked interpenetrating network of sulfonated polyvinyl alcohol and poly(2-acrylamido-2-methyl-1-propanesulfonic acid): Excellent relative selectivity
This study provides a method to synthesize inexpensive and readily prepared proton exchange membranes for DMFC applications. (Source: Journal of Membrane Science)
Source: Journal of Membrane Science - September 28, 2019 Category: Materials Science Source Type: research

Tailoring the internal void structure of polyamide films to achieve highly permeable reverse osmosis membranes for water desalination
Publication date: Available online 27 September 2019Source: Journal of Membrane ScienceAuthor(s): Zhao Zhang, Yitian Qin, Guodong Kang, Haijun Yu, Yan Jin, Yiming CaoAbstractThe considerable permeability of fully-aromatic polyamide reverse osmosis (RO) membranes is believed to be strongly dependent on the presence of a mount of internal voids within the polyamide separation layer, which provides additional permeation channels in addition to diffusion through the polyamide matrix. Based on this understanding, herein, we reported a novel strategy of developing highly permeable RO membranes via introducing a void-tailoring ag...
Source: Journal of Membrane Science - September 28, 2019 Category: Materials Science Source Type: research

Preparation and performance of a charge-mosaic nanofiltration membrane with novel salt concentration sensitivity for the separation of salts and dyes
Publication date: Available online 27 September 2019Source: Journal of Membrane ScienceAuthor(s): Ruizhang Xu, Jiantao Wang, Dandan Chen, Tianyu Liu, Zhuo Zheng, Feng Yang, Jinyao Chen, Jian Kang, Ya Cao, Ming XiangAbstractIn this research, l-lysine was adopted as a new aqueous monomer to react with 1,3,5-benzenetricarbonyl trichloride (TMC) for the preparation of polyamide thin-film composite (PA TFC) membrane (denoted as l-lysine TFC membrane in our research) via interfacial polymerization method. A novel salt concentration sensitive charge-mosaic nanofiltration membrane for the separation of salts and dyes was prepared....
Source: Journal of Membrane Science - September 28, 2019 Category: Materials Science Source Type: research

High flux reverse osmosis membranes fabricated with hyperbranched polymers via novel twice-crosslinked interfacial polymerization method
In this study, two kinds of carboxyl-terminated hyperbranched polyesters (HBPs) with special three-dimensional structure were proposed to act as the substrates to synthesize two new kinds of acyl chloride-terminated hyperbranched polyesters (HBPACs) that were used as the key functional materials to participate in the interfacial polymerization reaction to fabricate the novel thin film composite membranes (TFC) with high water flux and monovalent salt rejection. First, the two HBPACs were synthesized from two HBPs with different molecule weights (Mn ≈ 3289 g/mol and 1964 g/mol) through acylation reaction with th...
Source: Journal of Membrane Science - September 28, 2019 Category: Materials Science Source Type: research

Effect of carboxyl and hydroxyl groups on adsorptive polysaccharide fouling: A comparative study based on PVDF and graphene oxide (GO) modified PVDF surfaces
Publication date: Available online 26 September 2019Source: Journal of Membrane ScienceAuthor(s): Yaozhong Zhang, Yifan Wang, Xin Cao, Jinkai Xue, Qian Zhang, Jiayu Tian, Xiaoliang Li, Xiaopeng Qiu, Baozhu Pan, April Z. Gu, Xing ZhengAbstractWe investigated the contribution of different functional groups on polysaccharides to membrane fouling. To achieve so, we examined the adsorption of two typical polysaccharides, i.e., glucan (only –OH) and sodium alginate (enriched –COOH) on surfaces of PVDF membranes with and without graphene oxide (GO) modification. The results suggest that the interaction between carboxy...
Source: Journal of Membrane Science - September 28, 2019 Category: Materials Science Source Type: research

Single-use, single-pass tangential flow filtration using low-cost hollow fiber modules
The objective of this study was to use commercially available hollow fiber membranes, originally designed for high-flux hemodialysis, for single pass tangential flow filtration with high conversions. Experiments were performed with solutions of Immunoglobulin G (IgG) using polysulfone hollow fiber membrane cartridges with a surface area of 1.9 m2. The hollow fiber modules were able to provide more than 10-fold concentration of IgG in a single-pass with exit concentrations greater than 200 g/L. Stable operation was achieved during a continuous run for over a 120-h period with feed side pressure drops less than 1 kPa a...
Source: Journal of Membrane Science - September 28, 2019 Category: Materials Science Source Type: research