Article
Chemistry, Physical
Atif Hussain, Pierre Blanchet
Summary: This study focuses on developing advanced water-resistant bio-based membranes with enhanced vapor permeability for building envelopes, using micro-fibrillated cellulose fiber (CF) and polylactic acid (PLA).
Review
Chemistry, Multidisciplinary
Neshat Rozatian, David R. W. Hodgson
Summary: This review discusses the experimental approaches used to determine the reactivities of N-F class electrophilic fluorinating reagents, focusing on recent kinetics studies. Critical evaluations are made against different experimental and theoretical approaches, highlighting the opportunities for achieving more efficient synthetic processes through kinetic understanding.
CHEMICAL COMMUNICATIONS
(2021)
Article
Biochemistry & Molecular Biology
Andrea Fernandez-Nieto, Sagrario Munoz, Vicenta Maria Barragan
Summary: This study compared different anion exchange membranes for their performance as an electrolyte in alkaline direct alcohol fuel cells and found that doping conditions have a significant impact on membrane alcohol permeability.
Review
Engineering, Chemical
Amanda Grylewicz, Sylwia Mozia
Summary: Polymeric membranes are commonly used in water and wastewater treatment, but pressure-driven membranes are prone to fouling and biofouling. On the other hand, forward osmosis membranes are less affected by fouling but have limited potential in wastewater treatment due to low permeation. The use of various nano-materials has been proposed to enhance membrane performance in terms of permeability, antifouling/antibiofouling resistance, and separation properties.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Zhi Long, Kenji Miyatake
Summary: Researchers have developed a novel sulfonated polyphenylene membrane for high-temperature and low-humidity operation of proton exchange membrane fuel cells (PEMFCs), demonstrating superior proton conductivity and catalytic activity. The membrane achieved a high power density of 390 mW cm(-2) at 120 degrees Celsius and 30% relative humidity, with confirmed durability under accelerated degradation conditions for 1000 hours.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Frank Marco den Hoed, Andrea Ottomaniello, Omar Tricinci, Luca Ceseracciu, Marco Carlotti, Patrizio Raffa, Virgilio Mattoli
Summary: This study presents a novel technique for the realization of 3D micro-structures on complex surfaces with high conformability. The method involves two-photon polymerization of micro-structures on polymeric nano-membranes, which can be efficiently transferred to a target surface. Ultra-thin polymeric films are used as support to suspend and transfer the printed micro-structures. The technique offers flexibility in choice of structures, materials, transfer procedures, and substrate geometries.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Biochemistry & Molecular Biology
Arshad Hussain, Mohammed Al-Yaari
Summary: The study investigated the treatment of oily wastewater using developed cellulose acetate (CA) membranes blended with Nylon 66. The fabricated blended membranes showed better thermal and mechanical properties compared to a commercial membrane. Experimental results showed that the synthetic membrane with 2% Nylon 66 and DMSO as a solvent had higher permeate flux and oil rejection compared to the commercial membrane.
Article
Chemistry, Multidisciplinary
Xingyu Wu, Nanjun Chen, Chuan Hu, Harm-Anton Klok, Young Moo Lee, Xile Hu
Summary: A fluorination strategy is reported to create a phase-separated morphological structure in poly(aryl piperidinium) anion-exchange membranes (AEMs). The fluorinated AEMs possess high conductivity and dimensional stability, as well as excellent mechanical and chemical stability. AEMFCs using these fluorinated AEMs achieve outstanding peak power density and remain stable over extended operation.
ADVANCED MATERIALS
(2023)
Article
Polymer Science
Ilsiya M. Davletbaeva, Oleg O. Sazonov, Ilyas N. Zakirov, Askhat M. Gumerov, Alexander V. Klinov, Azat R. Fazlyev, Alexander V. Malygin
Summary: Increasing solute content and ionogenic groups leads to significant improvement in the water vapor permeability of organophosphorus polyurethane ionomers. Conditions promoting clustering of phosphate anions increase the permeability coefficient but may hinder water movement. Materials synthesized using polyoxyethylene glycol show the highest water vapor permeability and pervaporation characteristics.
Review
Environmental Sciences
Shankar Kunalan, Kandasamy Palanivelu
Summary: Carbon dioxide emission is the main cause of environmental issues like global warming and climate change. Capturing CO2 from industrial sources is an important step to address these problems. Polymeric composite membranes have shown better performance in CO2 capture compared to other membranes due to their composite structure. This review discusses the utilization of different polymeric composite membranes and their potential to improve the CO2 capture process in industrial applications.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Green & Sustainable Science & Technology
Kai Yan, Chenyan Liu, Jianzhong Ma
Summary: In this study, a functional membrane with both water vapor permeability and antibacterial properties was successfully prepared using DFNS@CS/WPUA membranes, showing increased WVP, excellent antimicrobial activity, improved stress, and water resistance.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Environmental
Duong T. Nguyen, Kian P. Lopez, Sangsuk Lee, Jongho Lee, Mark T. Hernandez, Anthony P. Straub
Summary: Pressure-driven distillation is a separation process that uses hydraulic pressure to transport water vapor through a hydrophobic membrane. This study demonstrates the use of scalable polymeric membranes in pressure-driven distillation for desalination. The membranes showed high rejection of sodium chloride and were unaffected by doses of sodium hypochlorite. Additionally, the membranes exhibited high temperature resilience. This work highlights the advantages of chlorine tolerance and heat tolerance in pressure-driven distillation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2023)
Article
Engineering, Chemical
Wenping Li, Chen Chen, Xiaohui Liu, Xuefei Li, Xiaohong Jiang, Xiaoli Liu, Jiazhi Yang, Jianguo Liu
Summary: In this study, a GO nanolayer was successfully deposited on TiO2 modified PTFE film by controlling the concentration of GO in suction filtration process. Nafion was then sprayed on the surface of the complex to construct a high-performance fuel cell composite membrane, which has low cost and greatly promotes the application process of fuel cells.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Keenan Smith, Fabrizia Foglia, Adam J. J. Clancy, Dan J. L. Brett, Thomas S. S. Miller
Summary: This study demonstrates a new multifunctional additive, 2D poly(triazine imide) (PTI), for composite proton exchange membranes (PEMs), which significantly improves proton conductivity and current/power densities in industrially relevant PEM fuel cells (PEMFCs). The enhanced performance is attributed to the formation of polymer aggregate-PTI clusters with increased 2D character and improved long-range connectivity, as well as acid-base interactions with pyridinic nitrogen facilitating proton hopping mechanism at all relative humidities. This work offers a new membrane concept with proven benefits for important electrochemical technologies and provides design principles for future optimization of proton transport and water management within PEMs.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Biochemistry & Molecular Biology
Ilsiya M. M. Davletbaeva, Oleg O. O. Sazonov, Sergey E. E. Dulmaev, Alexander V. V. Klinov, Azat R. R. Fazlyev, Ruslan S. S. Davletbaev, Sergey V. V. Efimov, Vladimir V. V. Klochkov
Summary: By using aminoethers of boric acid as the basis, polyurethane vapor-permeable and pervaporative membranes were studied. It was found that modifying the structure with bulk adducts can greatly improve the vapor permeability of the membranes and achieve efficient isopropanol dehydration.
Article
Polymer Science
Igor I. Ponomarev, Yulia A. Volkova, Ivan I. Ponomarev, Dmitry Y. Razorenov, Kirill M. Skupov, Roman Y. Nikiforov, Sergey V. Chirkov, Victoria E. Ryzhikh, Nikolay A. Belov, Alexander Y. Alentiev
Summary: Semi-ladder high-molecular polynaphthoylenebenzimidazoles (PNBI) were synthesized and demonstrated excellent mechanical properties after thermal cyclization. PNBI was found to be located near the upper bound of the Robeson diagram for various gas pairs and exhibited lower gas diffusion coefficients and higher gas solubility coefficients. The high diffusion selectivity of PNBI makes it a suitable candidate for organic molecular sieves.
Article
Polymer Science
Alexander Yu Alentiev, Ivan S. Levin, Nikolay A. Belov, Roman Yu Nikiforov, Sergey V. Chirkov, Denis A. Bezgin, Victoria E. Ryzhikh, Julia V. Kostina, Victor P. Shantarovich, Leonid Yu Grunin
Summary: Poly-2,6-dimethylphenylene oxide (PPO) films with varying degrees of crystallinity were prepared and studied using various physicochemical methods. The solubility coefficients of gases in PPO samples were measured and the activation energies of gas permeation and diffusion were estimated based on temperature dependencies. The results confirm the nanoporosity and gas-permeable crystalline phase of PPO, suggesting its potential as an organic molecular sieve material.
Article
Polymer Science
Alexey V. Roenko, Roman Y. Nikiforov, Maria L. Gringolts, Nikolay A. Belov, Yulia I. Denisova, Georgiy A. Shandryuk, Galina N. Bondarenko, Yaroslav V. Kudryavtsev, Eugene S. Finkelshtein
Summary: Commercial metathesis polynorbornene is used for high-damping coatings and materials. Post-modification of this polymer can improve its adhesive, gas barrier, and other properties. The study shows that post-modification significantly affects the thermal, gas separation, and mechanical properties of the copolymers.
Article
Polymer Science
Mikhail Mazo, Roman Khudobin, Nikolay Balabaev, Nikolay Belov, Victoria Ryzhikh, Roman Nikiforov, Rimpa Chatterjee, Susanta Banerjee
Summary: This study investigated the structural properties of 5 polyetherimides using molecular dynamics simulations. The accessible free volume distribution of the polymers differed and correlated with experimental gas transport parameters. Analysis of the surface elements revealed the composition of the free volume surface.
Article
Polymer Science
O. A. Adzhieva, R. Yu Nikiforov, M. L. Gringolts, N. A. Belov, M. P. Filatova, Yu Denisova, Y. Kudryavtsev
Summary: Metathesis poly(5-perfluorobutyl-2-norbornene) was synthesized successfully and its effects on gas separation properties were studied. The introduction of perfluorobutyl substituent increased the permeability for noncondensable gases and improved the ideal selectivity for gas pairs containing methane.
POLYMER SCIENCE SERIES A
(2022)
Article
Chemistry, Physical
A. Yu Alentiev, V. E. Ryzhikh, R. Yu Nikiforov, D. A. Bezgin, S. Chirkov, N. A. Belov, A. M. Orlova, A. A. Kuznetsov
Summary: The transport behavior of oxygen, nitrogen, and hydrocarbons C-1-C-4 in polyimides based on 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and biphenyl-3,3',4,4'-tetracarboxylic acid dianhydride (BPDA) and diethyl toluene diamine (DETDA) was studied. The study considered the dependence of diffusion coefficient on the diffusant effective diameter and the solubility coefficients on the Lennard-Jones potential of pair interaction. It was found that the diffusion coefficients of butane deviate from the linear dependence on the logarithm of the diffusion coefficient and the square of the effective diameter, suggesting plasticization of the polymers with butane at 1 atm pressure. The permeability of gas mixtures O-2-N-2 and CO2-CH4 was also studied, showing slight differences in separation factor for the CO2-CH4 mixture compared to ideal selectivity.
MEMBRANES AND MEMBRANE TECHNOLOGIES
(2022)
Article
Chemistry, Physical
Nikolay A. Belov, Aleksandr Y. Alentiev, Dmitrii S. Pashkevich, Fedor A. Voroshilov, Edgar S. Dvilis, Igor P. Asanov, Roman Y. Nikiforov, Sergey V. Chirkov, Daria A. Syrtsova, Julia V. Kostina, Yulia G. Bogdanova
Summary: Poly(vinyl trimethylsilane) (PVTMS) films were fluorinated directly in a liquid medium (perfluorodecalin). Various techniques were used to investigate the changes, including SEM-XEDS, XPS, ATR-IR, and contact angle measurement. The results showed that fluorination primarily affected the Si(CH3)3 groups, with monofluorinated, difluorinated, and trifluorinated groups appearing at different stages. The depth of fluorination was estimated to be <= 1.1 μm, and surface oxidation and hydrophobicity were observed during the fluorination process.
Article
Polymer Science
Nikolay A. A. Belov, Aleksandr Yu. Alentiev, Dmitrii S. S. Pashkevich, Fedor A. A. Voroshilov, Edgar S. S. Dvilis, Roman Yu. Nikiforov, Sergey V. V. Chirkov, Daria A. A. Syrtsova, Julia V. V. Kostina, Igor I. I. Ponomarev, Igor P. P. Asanov, Yulia G. G. Bogdanova
Summary: In this study, a direct fluorination technique was used to treat the surface of PIM-1 films, and various instrumental techniques were employed to analyze the fluorinated samples. The results showed that fluorination mainly occurred in methylene- and methyl-groups, and cyano-groups, aromatic hydrogens, and the aromatic structure of PIM-1 were relatively stable under the fluorination conditions. Additionally, the fluorination time and film depth had an impact on the fluorine concentration and surface energy.
Article
Polymer Science
Vsevolod A. Zhigarev, Roman Y. Nikiforov, Valentin G. Lakhtin, Georgiy A. Shandryuk, Nikolai A. Belov, Maria L. Gringolts
Summary: New bis-trimethylsilyl-substituted poly(tricyclo[4.2.2.02,5]deca-3,9-diene) (PTDDSi2) and poly(tricyclo [4.2.2.02,5]deca-3,7,9-triene) (PTDTSi2) were successfully synthesized by ring-opening metathesis polymerization. The polymerization conditions and the spatial structure of the monomer and polymer had significant effects on the synthesis and properties. PTDDSi2 showed high rigidity and thermal stability, while PTDTSi2 underwent retrodiene decomposition at a relatively low temperature. Gas permeability studies revealed that PTDDs belonged to moderately permeable polymers, with PTDDSi2 exhibiting solubility controlled permeability.
Review
Chemistry, Multidisciplinary
Alexander Yu. Alentiev, Victoria E. Ryzhikh, Darya A. Syrtsova, Nikolay A. Belov
Summary: This review explores the use of polymeric membranes in membrane gas separation, discussing the concepts, principles, and characteristics of diffusion gas transfer and membrane gas separation. It also considers the selection of membrane materials based on the properties of the gas +/- polymer system and polymer structure and properties. The review demonstrates the application of existing commercial polymers and advanced polymeric materials in solving important gas separation problems and highlights the avenues for development of membrane materials science in this field. It is intended for specialists in polymer synthesis, physics, membrane materials science, and membrane technology.
RUSSIAN CHEMICAL REVIEWS
(2023)
Article
Polymer Science
Olga A. A. Adzhieva, Maria L. L. Gringolts, Yulia I. I. Denisova, Georgiy A. A. Shandryuk, Ekaterina A. A. Litmanovich, Roman Yu. Nikiforov, Nikolay A. A. Belov, Yaroslav V. V. Kudryavtsev
Summary: In this study, new diblock, multiblock, and random copolymers of cyclooctene with two fluorinated norbornenes were synthesized and their thermal, surface, bulk, and solution characteristics were investigated and compared. The properties of multiblock copolymers were generally closer to those of diblock copolymers than of random ones. Diblock and multiblock fluorine-imide-containing copolymers showed a tendency to form micelles in chloroform solutions well below the overlap concentration.
Article
Chemistry, Physical
D. A. Syrtsova, A. Yu. Alentiev, S. V. Chirkov, D. A. Bezgin, R. Yu. Nikiforov, I. S. Levin, N. A. Belov
Summary: In this work, one-sided modification of homogeneous polymer films of poly(vinyltrimethylsilane) (PVTMS), poly(2,6-dimethyl-1,4-phenylene oxide) (PPO), and polybenzodioxane (PIM-1) by liquid-phase fluorination was carried out. The fluorination time ranged from 10 to 60 minutes. The modification led to a decrease in the effective diffusion coefficients and effective solubility coefficients of oxygen and nitrogen gases, resulting in an improvement in the permeability selectivity. The obtained results demonstrate the potential application of this method for modifying polymer films and membranes.
MEMBRANES AND MEMBRANE TECHNOLOGIES
(2023)
Article
Engineering, Chemical
Dmitry A. Alentiev, Roman Yu. Nikiforov, Marina A. Rudakova, Danil P. Zarezin, Maxim A. Topchiy, Andrey F. Asachenko, Nikolay A. Belov, Maxim Bermeshev
Summary: A series of new norbornene-type monomers containing linear and branched substituents were synthesized, and robust thin membranes were prepared by vinyl-addition polymerization. Gas separation performance for the synthesized polymers was evaluated, and the structure of substituent side chains was found to significantly affect gas permeability and CO2 facilitated transport.
JOURNAL OF MEMBRANE SCIENCE
(2024)
Article
Polymer Science
Nikolay A. Belov, Aleksandr Yu Alentiev, Roman Yu Nikiforov, Sergei V. Chirkov, Denis A. Bezgin, Daria A. Syrtsova, Victoria E. Ryzhikh, Igor I. Ponomarev
Summary: The gas transport properties of PIM-1 films treated with elemental fluorine in a liquid perfluorodecalin were investigated. The investigation included analyzing the fluorine content in the fluorinated layer, measuring permeability, diffusion and solubility coefficients, assessing ideal selectivity, and observing the effect of fluorination time on gas transport properties. The results showed that an increase in treatment duration led to higher fluorine concentration and depth of fluorination in the layer. The drop in gas permeability depended on the kinetic size of the gas molecules, and the decrease was more significant in the gas-phase regime compared to the liquid-phase regime. The fluorinated PIM-1 samples exhibited excellent gas separation characteristics, surpassing the Robeson upper bounds for various gas pairs. Mixed gas experiments also showed promising results for recovering helium from natural gas and hydrogen from catalytic and biohydrogen production mixtures. Aging of the fluorinated PIM-1 sample resulted in a decline in permeability and a slight decrease in ideal selectivity.
Article
Chemistry, Multidisciplinary
A. A. Andreev, N. A. Belov, V. V. Makarova, G. A. Shandryuk, D. V. Bryankin, D. S. Pashkevich, A. Yu. Alentiev
Summary: This study aims to prepare dispersions of polyethylene glycols (PEGs) and perfluorodecalin (PFD) by sonication for the synthesis of perfluorinated polyether. The solubility of PEGs with different molecular masses (MM) in PFD was investigated, showing low compatibility. The results indicate that the sonication process significantly influenced the particle size distribution of the dispersions, with stability lasting several hours.
EURASIAN CHEMICO-TECHNOLOGICAL JOURNAL
(2022)