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Artigos de revistas sobre o tema "Heterogeneous membranes"

Autor: Grafiati

Publicado: 12 de outubro de 2023

Última modificação: 25 de julho de 2025

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1

Strzelewicz, Anna, Monika Krasowska, and Michał Cieśla. "Lévy Flights Diffusion with Drift in Heterogeneous Membranes." Membranes 13, no. 4 (2023): 417. http://dx.doi.org/10.3390/membranes13040417.

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The modelling of diffusion in membranes is essential to understanding transport processes through membranes, especially when it comes to improving process efficiency. The purpose of this study is to understand the relationship between membrane structures, external forces, and the characteristic features of diffusive transport. We investigate Cauchy flight diffusion with drift in heterogeneous membrane-like structures. The study focuses on numerical simulation of particle movement across different membrane structures with differently spaced obstacles. Four studied structures are similar to real

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Magnone, Edoardo, Jae Yeon Hwang, Min Chang Shin, Xuelong Zhuang, Jeong In Lee, and Jung Hoon Park. "Al2O3-Based Hollow Fiber Membranes Functionalized by Nitrogen-Doped Titanium Dioxide for Photocatalytic Degradation of Ammonia Gas." Membranes 12, no. 7 (2022): 693. http://dx.doi.org/10.3390/membranes12070693.

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In recent years, reactive ammonia (NH3) has emerged as a major source of indoor air pollution. In this study, Al2O3-based hollow fiber membranes functionalized with nitrogen-doped titanium dioxide were produced and successfully applied for efficient heterogeneous photocatalytic NH3 gas degradation. Al2O3 hollow fiber membranes were prepared using the phase inversion process. A dip-coating technique was used to deposit titanium dioxide (TiO2) and nitrogen-doped titanium dioxide (N-TiO2) thin films on well-cleaned Al2O3-based hollow fiber membranes. All heterogeneous photocatalytic degradation t

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3

Septiawan, Muhammad Ridwan, Dian Permana, Sitti Hadijah Sabarwati, La Ode Ahmad, and La Ode Ahmad Nur Ramadhan. "Functionalization of Chitosan with Maleic Anhydride for Proton Exchange Membrane." Indonesian Journal of Chemistry 18, no. 2 (2018): 313. http://dx.doi.org/10.22146/ijc.33141.

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Chitosan was modified by maleic anhydride, and it was then functionalized using heterogeneous and blending method to obtain the membrane. The results of the reaction between chitosan with maleic anhydride were signed by the new peak appears around 1475 cm-1 which attributed to C=C bending of alkene. The new peak also appears at 1590 cm-1 which attributed to N-H bending of amide. Chitosan-maleic anhydride membranes show microstructure of chitosan membrane with high porous density and rigidity while chitosan-maleic anhydride membranes have clusters. In addition, the thermal tenacity of membranes

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Zárybnická, Lucie, Eliška Stránská, Kristýna Janegová, and Barbora Vydrová. "The effect of 3D printing parameters on electrochemical properties of heterogeneous cation exchange membrane." Rapid Prototyping Journal 27, no. 8 (2021): 1538–47. http://dx.doi.org/10.1108/rpj-08-2020-0207.

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Purpose The study aims to focus on the preparation of a heterogeneous cation exchange membrane by a three-dimensional (3D) method – fused filament fabrication using a series of nozzles of various diameters (0.4–1.0 mm). Polypropylene random copolymer (PPR) as a polymeric binder was mixed with 50 Wt.% of the selected conventional cation exchange resin, and a filament was prepared using a single screw mini extruder. Then filament was processed by FFF into the membranes with a defined 3D structure. Design/methodology/approach Electrochemical properties, morphology, mechanical properties and water

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5

Hosseini, S. M., Z. Ahmadi, M. Nemati, F. Parvizian, and S. S. Madaeni. "Electrodialysis heterogeneous ion exchange membranes modified by SiO2 nanoparticles: fabrication and electrochemical characterization." Water Science and Technology 73, no. 9 (2016): 2074–84. http://dx.doi.org/10.2166/wst.2016.030.

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In the current study mixed matrix heterogeneous cation exchange membranes were prepared by solution casting technique. The effect of SiO2 nanoparticles in the polymeric solution on the physicochemical properties of prepared membranes was studied. Scanning optical microscope images showed uniform particle distribution and relatively uniform surfaces for the prepared membranes. The membrane water content was reduced by silica nanoparticles in the membranes' matrix. The membrane ion exchange capacity, membrane potential, transport number and selectivity were improved initially by an increase of S

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6

Karpenko, Tatyana V., Vladislava V. Shramenko, and Nikolay Viktorovich Sheldeshov. "Influence of the nature of the organic acid salt on the currentvoltage characteristics and electrochemical impedance spectra of anion-exchange membranes." Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases 26, no. 3 (2024): 447–55. http://dx.doi.org/10.17308/kcmf.2024.26/12220.

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To improve the processes of obtaining and isolating organic acids from solutions, it is necessary to understand the processes occurring on heterogeneous and homogeneous anion-exchange membranes in contact with solutions of salts of organic acids when electric current flows through the membrane system. The purpose of this paper was to study the effect of sodium salts of acetic, malonic, and citric acids on the current-voltage characteristics (CVC) and electrochemical impedance (ECI) spectra of heterogeneous and homogeneous anion-exchangemembranes. Heterogeneous Ralex AMH (Mega, Czech Republic)

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Polak, Daniel, and Maciej Szwast. "Material and Process Tests of Heterogeneous Membranes Containing ZIF-8, SiO2 and POSS-Ph." Materials 15, no. 18 (2022): 6455. http://dx.doi.org/10.3390/ma15186455.

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Heterogeneous membranes made of a polymer matrix and containing nano-metric fillers in their structure may present improved physicochemical and process properties compared to homogeneous membranes made only of polymer materials. Membranes made of a PEBAX®2533 block copolymer were tested with fillers such as ZIF-8, SiO2 and POSS-Ph being dosed to them. The material analysis and process tests indicate that these nanomaterials can be used as fillers for heterogeneous membranes. Chemometric analyses determined the influence of individual fillers on selected physicochemical properties of the materi

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8

Bejanidze, Irina, Oleksandr Petrov, Volodymyr Pohrebennyk, et al. "Sorption of Organic Electrolytes and Surfactants from Natural Waters by Heterogeneous Membranes." Applied Sciences 10, no. 20 (2020): 7383. http://dx.doi.org/10.3390/app10207383.

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The widespread use of surfactants increasingly requires the development and application of reliable methods for the demineralization of wastewaters, preventing environmental pollution. One of the most reliable and effective methods of demineralization of wastewaters is the electrodialysis method. Studying the behavior of large organic ions in the membrane is important for modeling cell membranes and purification of medicinal and biological preparations. The sorption characteristics of the MA-40 and MK-40 ion-exchange membranes in solutions of simple and organic electrolytes, and in a solution

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9

Reigada, Ramon. "Electroporation of heterogeneous lipid membranes." Biochimica et Biophysica Acta (BBA) - Biomembranes 1838, no. 3 (2014): 814–21. http://dx.doi.org/10.1016/j.bbamem.2013.10.008.

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10

Stenina, Irina A., and Andrey B. Yaroslavtsev. "Ionic Mobility in Ion-Exchange Membranes." Membranes 11, no. 3 (2021): 198. http://dx.doi.org/10.3390/membranes11030198.

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Membrane technologies are widely demanded in a number of modern industries. Ion-exchange membranes are one of the most widespread and demanded types of membranes. Their main task is the selective transfer of certain ions and prevention of transfer of other ions or molecules, and the most important characteristics are ionic conductivity and selectivity of transfer processes. Both parameters are determined by ionic and molecular mobility in membranes. To study this mobility, the main techniques used are nuclear magnetic resonance and impedance spectroscopy. In this comprehensive review, mechanis

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11

Vasilieva, V. I., E. E. Meshcheryakova, I. V. Falina, N. A. Kononenko, M. A. Brovkina, and E. M. Akberova. "Influence of Heterogeneous Ion-Exchange Membranes Composition on Their Structure and Transport Properties." Мембраны и мембранные технологии 13, no. 3 (2023): 163–71. http://dx.doi.org/10.31857/s2218117223030082.

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The physicochemical properties of experimental heterogeneous MK-40 and MA-41 membranes with different ratios of ion-exchange resin and polyethylene binder in their composition are studied. It is shown that the specific electrical conductivity in 0.01–1 M NaCl solution decreases by more than 3 times for cation-exchange membranes and by 2 times for anion-exchange ones with a decrease in the content of ion-exchange resin in the membranes from 69 to 55%. It has been established that the diffusion permeability of anion-exchange membranes is more sensitive to their composition and naturally increase

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12

Sarapulova, Veronika, Ekaterina Nevakshenova, Kseniia Tsygurina, Valentina Ruleva, Anna Kirichenko, and Ksenia Kirichenko. "Short-Term Stability of Electrochemical Properties of Layer-by-Layer Coated Heterogeneous Ion Exchange Membranes." Membranes 13, no. 1 (2022): 45. http://dx.doi.org/10.3390/membranes13010045.

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Layer-by-layer adsorption allows the creation of versatile functional coatings for ion exchange membranes, but the stability of the coating and resulting properties of modified membranes in their operation is a frequently asked question. This paper examines the changes in voltammetric curves of layer-by-layer coated cation exchange membranes and pH-metry of desalination chamber with a studied membrane and an auxiliary anion exchange membrane after short-term tests, including over-limiting current modes. The practical operation of the membranes did not affect the voltammetric curves, but enhanc

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Kim, Hyunjung, Taeyoung Kim, Azilah Abd Aziz, et al. "Structural heterogeneity yet high similarity of the microbial community on reverse osmosis membrane-driven biofilms during seawater desalination." Environmental Science: Water Research & Technology 6, no. 11 (2020): 3066–79. http://dx.doi.org/10.1039/d0ew00366b.

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Maiygurova, Nina I., Frank Roessner, Tatiana V. Eliseeva, and Vladimir F. Selemenev. "SORPTION OF AMINO ACID AND CHANGES IN HYDRATION OF HETEROGENEOUS CATION- AND ANION-EXCHANGE MEMBRANES FUMASEP." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 59, no. 4 (2018): 73. http://dx.doi.org/10.6060/tcct.20165904.5336.

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Hydration of heterogeneous cation-exchange membranes Fumasep FTCM and anion-exchange membranes Fumasep FTAM in hydrogen and hydroxyl forms, respectively, sorbing tyrosine as well as of the samples being used in electrodialysis concentration of tyrosine solution was studied using the methods of thermogravimetry and IR-spectroscopy. It was revealed that tyrosine sorption and membranes application in electrodialysis of this amino acid solution causes membranes hydration decrease. The decrease in membrane hydration after its contact with tyrosine leads to membrane surface hydrophobicity grow up an

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15

Polak, Daniel, and Maciej Szwast. "Analysis of the Influence of Process Parameters on the Properties of Homogeneous and Heterogeneous Membranes for Gas Separation." Membranes 12, no. 10 (2022): 1016. http://dx.doi.org/10.3390/membranes12101016.

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Heterogeneous membranes, otherwise known as Mixed Matrix Membranes (MMMs), which are used in gas separation processes, are the subject of growing interest. This is due to their potential to improve the process properties of membranes compared to those of homogeneous membranes, i.e., those made of polymer only. Using such membranes in a process involves subjecting them to varying temperatures and pressures. This paper investigates the effects of temperature and feed pressure on the process properties of homogeneous and heterogeneous membranes. Membranes made of Pebax®2533 copolymer and containi

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16

Düerkop, Dennis, Hartmut Widdecke, Carsten Schilde, Ulrich Kunz, and Achim Schmiemann. "Polymer Membranes for All-Vanadium Redox Flow Batteries: A Review." Membranes 11, no. 3 (2021): 214. http://dx.doi.org/10.3390/membranes11030214.

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Redox flow batteries such as the all-vanadium redox flow battery (VRFB) are a technical solution for storing fluctuating renewable energies on a large scale. The optimization of cells regarding performance, cycle stability as well as cost reduction are the main areas of research which aim to enable more environmentally friendly energy conversion, especially for stationary applications. As a critical component of the electrochemical cell, the membrane influences battery performance, cycle stability, initial investment and maintenance costs. This review provides an overview about flow-battery ta

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17

Stenina, Irina, Polina Yurova, Aslan Achoh, Victor Zabolotsky, Liang Wu, and Andrey Yaroslavtsev. "Improvement of Selectivity of RALEX-CM Membranes via Modification by Ceria with a Functionalized Surface." Polymers 15, no. 3 (2023): 647. http://dx.doi.org/10.3390/polym15030647.

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Ion exchange membranes are widely used for water treatment and ion separation by electrodialysis. One of the ways to increase the efficiency of industrial membranes is their modification with various dopants. To improve the membrane permselectivity, a simple strategy of the membrane surface modification was proposed. Heterogeneous RALEX-CM membranes were surface-modified by ceria with a phosphate-functionalized surface. Despite a decrease in ionic conductivity of the prepared composite membranes, their cation transport numbers slightly increase. Moreover, the modified membranes show a threefol

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18

Chen, Kaikai, Wei Zhao, Changfa Xiao, Hui Zhu, and Qiming Wang. "Membrane Fouling Mechanism of HTR-PVDF and HMR-PVDF Hollow Fiber Membranes in MBR System." Water 14, no. 16 (2022): 2576. http://dx.doi.org/10.3390/w14162576.

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Membrane fouling has attracted a lot of attention in the membrane separation field. Herein, we selected the homogeneous-reinforced polyvinylidene fluoride (HMR-PVDF) and heterogeneous-reinforced polyvinylidene fluoride (HTR-PVDF) hollow fiber membranes to investigate the fouling mechanism of membranes in membrane bioreactor (MBR) systems. The filtration models, membrane adsorption experiment, and membrane resistance distribution after a long or short time operation were assessed to compare their antifouling properties in order to verify the optimal membrane. The outer surface, shown by an SEM

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19

Hosseini, S. M., A. Seidypoor, M. Nemati, S. S. Madaeni, F. Parvizian, and E. Salehi. "Mixed matrix heterogeneous cation exchange membrane filled with clay nanoparticles: membranes’ fabrication and characterization in desalination process." Journal of Water Reuse and Desalination 6, no. 2 (2015): 290–300. http://dx.doi.org/10.2166/wrd.2015.064.

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In this research mixed matrix PVC based-co-clay nanoparticles heterogeneous cation exchange membranes were prepared by solution casting technique. The effect of clay nanoparticles concentration in the casting solution on membrane electrochemical properties was studied. Scanning optical microscopy (SOM) images showed uniform particles distribution and relatively uniform surfaces for the prepared membranes. The membrane water content was improved initially by an increase of additive content ratio up to 1%wt in casting solution and then it began to decrease by more additive concentration. Moreove

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20

Loza, Sergey, Natalia Loza, Nikita Kovalchuk, Nazar Romanyuk, and Julia Loza. "Comparative Study of Different Ion-Exchange Membrane Types in Diffusion Dialysis for the Separation of Sulfuric Acid and Nickel Sulfate." Membranes 13, no. 4 (2023): 396. http://dx.doi.org/10.3390/membranes13040396.

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The possibility of using various types of ion-exchange membranes in diffusion dialysis for the separation of sulfuric acid and nickel sulfate has been evaluated. The process of the dialysis separation of a real waste solution from an electroplating facility containing 252.3 g/L of sulfuric acid, 20.9 g/L of nickel ions and small amounts of zinc, iron, copper ions, etc. has been studied. Heterogeneous cation-exchange membrane containing sulfonic groups and heterogeneous anion-exchange membranes with different thicknesses (from 145 μm to 550 μm) and types of fixed groups (four samples with quate

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21

Burganos, Vasilis N. "Membranes and Membrane Processes." MRS Bulletin 24, no. 3 (1999): 19–22. http://dx.doi.org/10.1557/s0883769400051861.

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Membrane separation science has enjoyed tremendous progress since the first synthesis of membranes almost 40 years ago, which was driven by strong technological needs and commercial expectations. As a result, the range of successful applications of membranes and membrane processes is continuously broadening. An additional change lies in the nature of membranes, which is now extended to include liquid and gaseous materials, biological or synthetic. Membranes are understood to be thin barriers between two phases through which transport can take place under the action of a driving force, typicall

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22

Gupta, Mayuri, and Donald F. Weaver. "Microsecond molecular dynamics studies of cholesterol-mediated myelin sheath degeneration in early Alzheimer's disease." Physical Chemistry Chemical Physics 24, no. 1 (2022): 222–39. http://dx.doi.org/10.1039/d1cp03844c.

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Extensive microsecond MD simulations were performed for heterogeneous reference membranes and physiologically relevant model myelin sheath membrane with systematically varied cholesterol composition to understand early Alzheimer's disease pathology.

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23

MIZUNO, Hiroki, and Hiroshi KOIBUCHI. "102 String Tension of Heterogeneous Membranes." Proceedings of Ibaraki District Conference 2012.20 (2012): 3–4. http://dx.doi.org/10.1299/jsmeibaraki.2012.20.3.

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Gu, Ruo-Xu, Svetlana Baoukina, and D. Peter Tieleman. "Cholesterol Flip-Flop in Heterogeneous Membranes." Journal of Chemical Theory and Computation 15, no. 3 (2019): 2064–70. http://dx.doi.org/10.1021/acs.jctc.8b00933.

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Vyas, Punita V., B. G. Shah, G. S. Trivedi, P. Ray, S. K. Adhikary, and R. Rangarajan. "Studies on heterogeneous cation-exchange membranes." Reactive and Functional Polymers 44, no. 2 (2000): 101–10. http://dx.doi.org/10.1016/s1381-5148(99)00084-x.

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Pandit, Sagar A., and H. Larry Scott. "Multiscale simulations of heterogeneous model membranes." Biochimica et Biophysica Acta (BBA) - Biomembranes 1788, no. 1 (2009): 136–48. http://dx.doi.org/10.1016/j.bbamem.2008.09.004.

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Guiver, Michael D., Paul Black, Chung M. Tam, and Yves Deslandes. "Functionalized polysulfone membranes by heterogeneous lithiation." Journal of Applied Polymer Science 48, no. 9 (1993): 1597–606. http://dx.doi.org/10.1002/app.1993.070480912.

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Korzhov, A. N., A. R. Achoh, S. A. Loza, E. N. Nosova, D. V. Davidov, and S. S. Melnikov. "Using a microheterogeneous model to assess the applicability of ion-exchange membranes in the process of reverse electrodialysis." Chimica Techno Acta 8, no. 2 (2021): 20218205. http://dx.doi.org/10.15826/chimtech.2021.8.2.05.

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This paper shows the possibility of using a microheterogeneous model to describe the properties of ion-exchange membranes and calculate the characteristics of a reverse electrodialyzer from the data obtained. We studied the properties of eight samples of heterogeneous cation exchange membranes (two samples of each type of membrane). The samples differed in the year of issue and storage conditions. It is shown that for heterogeneous ion-exchange membranes MK-40 and MA-41, the samples' properties can differ significantly. The counterions transport numbers calculated within the framework of the m

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Krausser, Johannes, Tuomas P. J. Knowles, and Anđela Šarić. "Physical mechanisms of amyloid nucleation on fluid membranes." Proceedings of the National Academy of Sciences 117, no. 52 (2020): 33090–98. http://dx.doi.org/10.1073/pnas.2007694117.

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Biological membranes can dramatically accelerate the aggregation of normally soluble protein molecules into amyloid fibrils and alter the fibril morphologies, yet the molecular mechanisms through which this accelerated nucleation takes place are not yet understood. Here, we develop a coarse-grained model to systematically explore the effect that the structural properties of the lipid membrane and the nature of protein–membrane interactions have on the nucleation rates of amyloid fibrils. We identify two physically distinct nucleation pathways—protein-rich and lipid-rich—and quantify how the me

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Park, Minseong, Byungjoon Bae, Taegeon Kim, Hyun S. Kum, and Kyusang Lee. "2D materials-assisted heterogeneous integration of semiconductor membranes toward functional devices." Journal of Applied Physics 132, no. 19 (2022): 190902. http://dx.doi.org/10.1063/5.0122768.

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Heterogeneous integration techniques allow the coupling of highly lattice-mismatched solid-state membranes, including semiconductors, oxides, and two-dimensional materials, to synergistically fuse the functionalities. The formation of heterostructures generally requires two processes: the combination of crystalline growth and a non-destructive lift-off/transfer process enables the formation of high-quality heterostructures. Although direct atomic interaction between the substrate and the target membrane ensures high-quality growth, the strong atomic bonds at the substrate/epitaxial film interf

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Song, Chang Hyeon, Maulida Zakia, Geon Seok Lee, and Seong Il Yoo. "Scattering-mediated photothermal heating in plasmonic PES/Au membranes for heterogeneous catalysis." Materials Chemistry Frontiers 5, no. 5 (2021): 2425–33. http://dx.doi.org/10.1039/d0qm00746c.

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Yin, Yiming, Wei Wang, Arun K. Kota, Song Zhao, and Tiezheng Tong. "Elucidating mechanisms of silica scaling in membrane distillation: effects of membrane surface wettability." Environmental Science: Water Research & Technology 5, no. 11 (2019): 2004–14. http://dx.doi.org/10.1039/c9ew00626e.

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The contributions of homogeneous and heterogeneous nucleation to silica scaling in membrane distillation were investigated by testing membranes with varied surface wettability. A four-step mechanism was proposed to elaborate the process.

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Zendehnam, Akbar, Mina Arabzadegan, Sayed Mohsen Hosseini, and Nasrin Robatmili. "Fabrication and modification of mixed matrix polyvinylchloride based heterogeneous cation exchange membrane by Ag nanolayer/plasma treatment: investigation of nanolayer deposition rate effect." Journal of Polymer Engineering 34, no. 4 (2014): 359–67. http://dx.doi.org/10.1515/polyeng-2013-0055.

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Abstract In this research, mixed matrix cation exchange membranes were prepared by the solution casting technique using polyvinylchloride (PVC) as base binder, resin powder as functional groups agent, iron-nickel oxide nanoparticles as adsorptive filler and silver (Ag) nanolayers as surface modifier. Ag nanolayer was deposited on the membrane surface by the magnetron sputtering method. The effects of nanolayer deposition rate (low, medium and high) on physicochemical and antibacterial characteristics of the membranes were studied. X-ray diffraction (XRD) results revealed that membrane crystall

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Guan, Zhangbin, Bingyu Wang, Yan Wang, Jing Chen, Chunyang Bao, and Qiang Zhang. "Iron-containing poly(ionic liquid) membranes: a heterogeneous Fenton reaction and enhanced anti-fouling ability." Polymer Chemistry 13, no. 1 (2022): 130–38. http://dx.doi.org/10.1039/d1py01345a.

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Iron-containing poly(ionic liquid) membranes were prepared by Cu(0)-mediated reversible deactivation radical polymerization, which was achieved to catalyze a heterogeneous Fenton reaction and realize self-cleaning of the membrane surface.

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Tsygurina, Kseniia, Olesya Rybalkina, Konstantin Sabbatovskiy, Evgeniy Kirichenko, Vladimir Sobolev, and Ksenia Kirichenko. "Layer-by-Layer Coating of MK-40 Heterogeneous Membrane with Polyelectrolytes Creates Samples with Low Electrical Resistance and Weak Generation of H+ and OH− Ions." Membranes 11, no. 2 (2021): 145. http://dx.doi.org/10.3390/membranes11020145.

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Ion exchange membranes covered with layers of polyelectrolytes of alternating charges are characterized by very high monovalent selectivity. This allows the use of such membranes for electrodialytic fractionation of multicomponent solutions. However, the very existence of the boundary at which differently charged layers come in contact can hinder a membrane’s effectiveness by limiting its ion permeability, raising levels of H+ and OH− ions (thus shifting the pH) and increasing the electrical resistance of the membrane, which leads to increased energy consumption. To test how these properties w

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Park, Cheol Oh, and Ji Won Rhim. "Performance of Membrane Capacitive Deionization Process Using Polyvinylidene Fluoride Heterogeneous Ion Exchange Membranes Part I : Preparation and Characterization of Heterogeneous Ion Exchange Membranes." Membrane Journal 27, no. 1 (2017): 84–91. http://dx.doi.org/10.14579/membrane_journal.2017.27.1.84.

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Perreault, Véronique, Veronika Sarapulova, Ksenia Tsygurina, Natalia Pismenskaya, and Laurent Bazinet. "Understanding of Adsorption and Desorption Mechanisms of Anthocyanins and Proanthocyanidins on Heterogeneous and Homogeneous Cation-Exchange Membranes." Membranes 11, no. 2 (2021): 136. http://dx.doi.org/10.3390/membranes11020136.

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The presence of membrane fouling is the main drawback in membrane processes, and it is related to the premature use and high cost for the replacement of membranes. Polyphenols in cranberry juice are associated with ion-exchange membrane fouling, and it results in a loss of these beneficial compounds in the juice when treated by membrane processes such as electrodialysis. In the present work, four heterogeneous or pseudohomogeneous cation-exchange membranes (CSE-fg, MK-40, CEM Type-II, and CJMC-5), different in terms of the polymer matrix (aromatic, aliphatic), exchange capacity, size, and loca

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Walani, Nikhil, and Ashutosh Agrawal. "Stability of lipid membranes." Mathematics and Mechanics of Solids 22, no. 5 (2015): 1144–57. http://dx.doi.org/10.1177/1081286515617338.

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Lipid membranes are versatile biological structures that undergo significant structural remodelling, often triggered by instabilities. Since they invariably possess heterogeneous properties, owing to the presence of multiple lipid species and their interactions with proteins, heterogeneity can have a significant impact on their equilibrium state and stability. In this work, we use curvature elasticity to derive the generalized stability criterion for heterogeneous lipid membranes. Our formulation entertains strain energies that go beyond the Helfrich energy and exhibit higher-order dependence

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Kudelin, D. V., and T. N. Nesiolovskaya. "Application of a computational and experimental method of analysis the complexly stressed state of rubber membranes for effective solutions for their production." Proceedings of the Voronezh State University of Engineering Technologies 83, no. 2 (2021): 230–36. http://dx.doi.org/10.20914/2310-1202-2021-2-230-236.

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The competitiveness of rubber membranes determined by their durability, quality, reliability, including the time required to create. During operation, the membranes undergo complex deformations, as a result of which a large number of potential destruction zones of a different nature arise, which can lead to the failure of the product. The standard test methods used in the development of formulations for membranes involve testing the material under uniaxial tension conditions in most cases and do not take into account the actual loading conditions of the product during operation, which signific

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Brovkina, M. A., N. A. Kutenko, and N. V. Loza. "Elecrtochemical Investigation of Heterogeneous Cation-Exchange Membranes Modified by Polyanilin in Solutions of Monovalent and Divalent Cations." Мембраны и мембранные технологии 13, no. 3 (2023): 205–20. http://dx.doi.org/10.31857/s2218117223030033.

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A series of composite ion-exchange membranes based on a heterogeneous cation-exchange MK-40 membrane and polyaniline was obtained under the conditions of electrodiffusion of a monomer and an oxidizing agent. The process of polyaniline synthesis on the membrane surface was accompanied by the registration of chronopotentiograms and the pH of the solution leaving the desalination compartment. The initial MK-40 cation-exchange membrane and the composites based on it were studied by voltammetry and chronopotentiometry in NaCl, CaCl2, and MgCl2 solutions in the same electrodialysis flow cell in whic

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Couchman, J. R. "Heterogeneous distribution of a basement membrane heparan sulfate proteoglycan in rat tissues." Journal of Cell Biology 105, no. 4 (1987): 1901–16. http://dx.doi.org/10.1083/jcb.105.4.1901.

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A heparan sulfate proteoglycan (HSPG) synthesized by murine parietal yolk sac (PYS-2) cells has been characterized and purified from culture supernatants. A monospecific polyclonal antiserum was raised against it which showed activity against the HSPG core protein and basement membrane specificity in immunohistochemical studies on frozen tissue sections from many rat organs. However, there was no reactivity with some basement membranes, notably those of several smooth muscle types and cardiac muscle. In addition, it was found that pancreatic acinar basement membranes also lacked the HSPG type

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Gu, Qilin, Tze Chiang Albert Ng, Qiaomei Sun, et al. "Heterogeneous ZIF-L membranes with improved hydrophilicity and anti-bacterial adhesion for potential application in water treatment." RSC Advances 9, no. 3 (2019): 1591–601. http://dx.doi.org/10.1039/c8ra08758j.

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Heterogeneous Zn/Co-ZIF-L membranes were prepared through the successive growth of Zn-ZIF-L and Co-ZIF-L on the macroporous ceramic supports, and the obtained heterogeneous membranes showed improved hydrophilicity and anti-bacterial adhesion.

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Abbas, Ghulam, Alfredo E. Cardenas, and Ron Elber. "The Structures of Heterogeneous Membranes and Their Interactions with an Anticancer Peptide: A Molecular Dynamics Study." Life 12, no. 10 (2022): 1473. http://dx.doi.org/10.3390/life12101473.

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We conduct molecular dynamics simulations of model heterogeneous membranes and their interactions with a 24-amino acid peptide—NAF-144–67. NAF-144–67 is an anticancer peptide that selectively permeates and kills malignant cells; it does not permeate normal cells. We examine three membranes with different binary mixtures of lipids, DOPC–DOPA, DOPC–DOPS, and DOPC–DOPE, with a single peptide embedded in each as models for the diversity of biological membranes. We illustrate that the peptide organization in the membrane depends on the types of nearby phospholipids and is influenced by the charge a

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Vasil’eva, V. I., E. E. Meshcheryakova, O. I. Chernyshova, et al. "Transport and structural characteristics of heterogeneous ion-exchange membranes with varied dispersity of the ion exchanger." Membrany i membrannye tehnologii 14, no. 2 (2024): 143–54. http://dx.doi.org/10.31857/s2218117224020088.

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The structural and transport (conductivity and diffusion permeability) properties of cation- and anion-exchange membranes with different dispersity of ion-exchange resin particles have been studied. Experimental cation-exchange MK-40 and anion-exchange MA-41 membranes with varying particle sizes of ion exchange resin from 20 μm to 71 μm are manufactured at LLC IE Shchekinoazot (Russia). A comparative analysis of the structural characteristics of membranes using SEM reveals the anisotropy in the properties of the surface and section. The internal phase of the membrane is characterized by large

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Sadiq, Muhammad, Amir Naveed, Muhammad Arif, et al. "Geopolymerization: a promising technique for membrane synthesis." Materials Research Express 8, no. 11 (2021): 112002. http://dx.doi.org/10.1088/2053-1591/ac30e4.

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Abstract Ceramic membranes are considered superior over their polymeric counterparts for applications at high temperature, pressure, and in aggressive environments with additional advantages of cleaning at high temperature. Preparation of porous ceramic membrane is expensive because the ceramic materials cannot be processed in a liquid state as polymers. Ceramic membrane synthesis involved solid powder preparation, consolidation, suspension formation, calcination, and sintering temperature which makes its synthesis very expensive. Geopolymerization is a heterogeneous reaction of aluminosilicat

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Schauer, Jan, Javier Llanos, Jan Žitka, Jaromír Hnát, and Karel Bouzek. "Cation-exchange membranes: Comparison of homopolymer, block copolymer, and heterogeneous membranes." Journal of Applied Polymer Science 124, S1 (2011): E66—E72. http://dx.doi.org/10.1002/app.35524.

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Zhang, Yiming, Wei Zhang, and Luis F. Cházaro-Ruiz. "Porous PVDF/PANI ion-exchange membrane (IEM) modified by polyvinylpyrrolidone (PVP) and lithium chloride in the application of membrane capacitive deionisation (MCDI)." Water Science and Technology 77, no. 9 (2018): 2311–19. http://dx.doi.org/10.2166/wst.2018.152.

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Abstract In this work, polyvinylidene fluoride (PVDF)/polyaniline (PANI) heterogeneous anion-exchange membranes filled with pore-forming agents polyvinylpyrrolidone (PVP) and lithium chloride were prepared by the solution-casting technique using the solvent 1-methyl-2-pyrrolidone (NMP) and a two-step phase inversion procedure. Key properties of the as-prepared membranes, such as hydrophilicity, water content, ion exchange capacity, fixed ion concentration, conductivity and transport number were examined and compared between membranes in different conditions. The pore-forming hydrophilic additi

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Bleha, Miroslav, and Věra Šumberová. "Equilibrium Sorptions in Heterogeneous Ion Exchange Membranes." Collection of Czechoslovak Chemical Communications 57, no. 9 (1992): 1905–14. http://dx.doi.org/10.1135/cccc19921905.

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The equilibrium sorption of uni-univalent electrolytes (NaCl, KCl) in heterogeneous cation exchange membranes with various contents of the ion exchange component and in ion exchange membranes Ralex was investigated. Using experimental data which express the concentration dependence of equilibrium sorption, validity of the Donnan relation for the systems under investigation was tested and values of the Glueckauf inhomogeneity factor for Ralex membranes were determined. Determination of the equilibrium sorption allows the effect of the total content of internal water and of the ion-exchange capa

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Kharina, Anastasiia, and Tatiana Eliseeva. "Tyrosine Amino Acid as a Foulant for the Heterogeneous Anion Exchange Membrane." Membranes 13, no. 10 (2023): 844. http://dx.doi.org/10.3390/membranes13100844.

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The features of organic fouling have been revealed for highly basic anion exchange membranes during prolonged electrodialysis in solutions containing the aromatic amino acid tyrosine. With increased operation time when using MA-41 heterogeneous membranes in tyrosine solution, an increase in hydrophobicity and roughness characteristics of the material surface is detected. A reduction in tyrosine flux through the membrane occurs which is caused by its pores plugging and deposition of the amino acid at the membrane surface induced by tyrosine adsorption and local supersaturation of the solution i

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Oren, Y., V. Freger, and C. Linder. "Highly conductive ordered heterogeneous ion-exchange membranes." Journal of Membrane Science 239, no. 1 (2004): 17–26. http://dx.doi.org/10.1016/j.memsci.2003.12.031.

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