Journal of Membrane Science Letters最新文献

Sealing grain boundary defects in polycrystalline ZIF-8 membranes by graphene oxide coating 氧化石墨烯涂层密封多晶ZIF-8膜的晶界缺陷

IF 4.9

Journal of Membrane Science Letters Pub Date : 2025-05-14 DOI: 10.1016/j.memlet.2025.100100

Ga Eun Kim , Gyu-Jin Lee , Seoung-Eun Nam , Jinsoo Kim , Sung In Lim , Hyuk Taek Kwon

引用次数: 0

Partition energy in polyamide membranes and its link to ion-ion selectivity 聚酰胺膜的分配能及其与离子选择性的关系

IF 4.9

Journal of Membrane Science Letters Pub Date : 2025-05-02 DOI: 10.1016/j.memlet.2025.100099

Liat Birnhack , Oren Ben Porat , Ori Fridman , Tiezheng Tong , Razi Epsztein

{"title":"Partition energy in polyamide membranes and its link to ion-ion selectivity","authors":"Liat Birnhack , Oren Ben Porat , Ori Fridman , Tiezheng Tong , Razi Epsztein","doi":"10.1016/j.memlet.2025.100099","DOIUrl":"10.1016/j.memlet.2025.100099","url":null,"abstract":"<div><div>Understanding the mechanisms of molecular transport in polyamide membranes is imperative to improve their solute-specific selectivity. We explored the partitioning behaviors of water and salts in polyamide membranes to elucidate the role of ion-membrane interactions in the transport. Quartz crystal microbalance (QCM) was employed to quantify the mass uptake at different temperatures and determine partition energies (<em>E</em><sub>k</sub>) for water and salts under two different pH values. Zeta potential and permeability tests were conducted to support the ion-membrane affinity trends observed with QCM and link these trends to ion-ion selectivity. Our results demonstrate a high affinity of water to the polyamide membrane (<em>E</em><sub>k</sub> < 0), with a significant swelling effect attributed to dipole interactions and hydrogen bonding. Ion partitioning revealed distinct differences between monovalent and divalent cations, as well as between kosmotropic and chaotropic anions. Specifically, divalent cations (Ca<sup>2+</sup> and Mg<sup>2+</sup>) exhibited considerably lower partition energies (-0.99 and 0.29 kcal mol<sup>-1</sup>, respectively) and more efficient charge neutralization, indicating stronger interactions with the membrane compared to monovalent cations (∼2.2 kcal mol<sup>-1</sup>). The partition energies of the chaotropic iodide and kosmotropic sulphate anions were substantially different (-5.5 and 4.0 kcal mol<sup>-1</sup>, respectively), likely due to the different tendency of these anions to shed their hydration shell and stick to the polymer. Last, our permeability tests indicate the potential existence of an intrinsic tradeoff between ion partitioning and intrapore diffusion, presumably due to the opposite effects that ion-membrane interactions have on these transport steps. Overall, our work underscores the role of ion-specific interactions in membrane transport and selectivity.</div></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"5 1","pages":"Article 100099"},"PeriodicalIF":4.9,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rinse-free deposition of molecular layer-by-layer (mLbL) polyamide reverse osmosis membranes 分子层逐层（mLbL）聚酰胺反渗透膜的免冲洗沉积

IF 4.9

Journal of Membrane Science Letters Pub Date : 2025-04-29 DOI: 10.1016/j.memlet.2025.100098

Samarpan Deb Majumder , Christopher M. Stafford , Xitong Liu

{"title":"Rinse-free deposition of molecular layer-by-layer (mLbL) polyamide reverse osmosis membranes","authors":"Samarpan Deb Majumder , Christopher M. Stafford , Xitong Liu","doi":"10.1016/j.memlet.2025.100098","DOIUrl":"10.1016/j.memlet.2025.100098","url":null,"abstract":"<div><div>The molecular layer-by-layer (mLbL) deposition technique enables the fabrication of polyamide-based reverse osmosis membranes with low surface roughness and tunable membrane thickness, but scale-up of the process is challenged by the necessity for rinsing away unreacted monomers after each deposition step. By sensible tuning of monomer concentrations during deposition, we can eliminate the rinsing steps while still producing polyamide membranes with comparable thickness and surface properties. This approach markedly shortens fabrication time and improves reagent efficiency. By measuring the growth rate of the polyamide membrane as a function of deposition cycles and monomer concentration, we demonstrate that we can deliver a more targeted quantity of monomer to the growing film surface while maintaining a linear growth rate profile. Desalination tests reveal that mLbL membranes produced at the lowest monomer concentration (membrane thickness of ≈20 nm) achieved 99.9 % salt rejection within 4 h, while maintaining a flux of 0.98 L m⁻² h⁻¹ bar⁻¹, indicating that the crosslink density of the membrane remains high. This modified mLbL approach significantly reduces membrane fabrication time without compromising performance, offering a path towards scalable production of polyamide-based membranes with controlled thickness and low roughness while prioritizing both time and resource efficiency.</div></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"5 1","pages":"Article 100098"},"PeriodicalIF":4.9,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143918493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Revealing the spatiotemporal dynamics of protein fouling on micropatterned ultrafiltration membranes by in-situ visualization 利用原位可视化技术揭示蛋白质在微图超滤膜上污染的时空动态

IF 4.9

Journal of Membrane Science Letters Pub Date : 2025-04-24 DOI: 10.1016/j.memlet.2025.100097

Anna Malakian, Scott M. Husson

{"title":"Revealing the spatiotemporal dynamics of protein fouling on micropatterned ultrafiltration membranes by in-situ visualization","authors":"Anna Malakian, Scott M. Husson","doi":"10.1016/j.memlet.2025.100097","DOIUrl":"10.1016/j.memlet.2025.100097","url":null,"abstract":"<div><div>This study is the first to directly visualize and quantify the spatiotemporal dynamics of protein fouling on micropatterned ultrafiltration membranes using in situ confocal laser scanning microscopy (CLSM). In it, we investigated the effectiveness of adding microscale herringbone patterns to ultrafiltration membrane surfaces for reducing protein fouling. Patterns with different geometries were introduced to membrane surfaces by embossing with woven mesh fabrics. Having found earlier that CLSM can provide greater detail for the early (pre-monolayer) stage of fouling, we used CLSM in situ to investigate the protein fouling profiles on as-received and patterned membranes. Labeling the proteins and membranes with different fluorescent probes allowed the spatiotemporal imaging of protein deposition at the early stages of fouling. CLSM images were compared with filtration data to reveal the effect of pattern geometry on protein fouling. Extending the approach to other patterns and multi-component solutions can inform surface modification strategies to control protein fouling in pressure-driven membrane operations.</div></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"5 1","pages":"Article 100097"},"PeriodicalIF":4.9,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143895013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Streaming current monitoring as a new approach for early detection of membrane wetting 作为早期检测膜润湿新方法的流电流监测

IF 4.9

Journal of Membrane Science Letters Pub Date : 2025-04-09 DOI: 10.1016/j.memlet.2025.100096

Agathe Lizée, Patrick Loulergue, Anthony Szymczyk

引用次数: 0

Visualizing the local ion concentration in electrodialysis cells via magnetic resonance imaging 通过磁共振成像显示电渗析细胞中的局部离子浓度

IF 4.9

Journal of Membrane Science Letters Pub Date : 2025-03-14 DOI: 10.1016/j.memlet.2025.100094

Simon Wennemaring , Maximilian Meerfeld , Christian J. Linnartz , Matthias Wessling

{"title":"Visualizing the local ion concentration in electrodialysis cells via magnetic resonance imaging","authors":"Simon Wennemaring , Maximilian Meerfeld , Christian J. Linnartz , Matthias Wessling","doi":"10.1016/j.memlet.2025.100094","DOIUrl":"10.1016/j.memlet.2025.100094","url":null,"abstract":"<div><div>Electrodialysis (ED) offers a promising solution to address global freshwater shortages and prevent water pollution caused by brackish wastewater from industrial plants. However, local ion concentrations in an opaque ED module cannot currently be measured, even though this information is essential for efficient desalination.</div><div>Here, we introduce Magnetic Resonance Imaging (MRI) as an investigative technique to reveal the concentration profiles within ED modules. The signal intensity correlates with the local copper concentration, enabling us to reconstruct the copper distribution inside the module. In our setup, we used a platinum-coated titanium mesh as the anode and a copper mesh as the cathode. These materials are electrochemically stable and minimize disturbances to the tomograph’s magnetic field. In our example case, we applied a current density of 50mAcm<sup>-2</sup> with a flow rate of 0.1mLmin<sup>-1</sup>. The MRI measurement successfully showed desalination and concentration along the channel length, where the concentration in one diluate channel unexpectedly exhibited a local peak. However, the resolution of the utilized low-field tomograph was not sufficient to image the concentration polarization. Utilizing the proposed desalination module in a high-field tomograph with a higher resolution can deepen our understanding of the <em>in situ</em> process and pave the way for observation-based optimization including the boundary layer at the membranes and unexpected concentration profiles along the channel length.</div></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"5 1","pages":"Article 100094"},"PeriodicalIF":4.9,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the diffusive water transport through polyelectrolyte-based membranes 聚电解质基膜的扩散输水研究

IF 4.9

Journal of Membrane Science Letters Pub Date : 2025-03-13 DOI: 10.1016/j.memlet.2025.100095

Jannik Mehlis , Matthias Wessling

{"title":"On the diffusive water transport through polyelectrolyte-based membranes","authors":"Jannik Mehlis , Matthias Wessling","doi":"10.1016/j.memlet.2025.100095","DOIUrl":"10.1016/j.memlet.2025.100095","url":null,"abstract":"<div><div>This study investigates water transport behavior through polyelectrolyte membranes under varying pressure gradients using non-equilibrium molecular dynamics (NEMD) simulations. While net water transport is achieved under a pressure gradient, there is also a significant back-diffusion component, challenging the assumption of unidirectional pore flow in such systems. The auto-correlation function of water molecules reveals that water associations are transient and only occur for short periods compared to the overall residence time within the membrane. The correlation of water associations and the water dynamics inside the membrane are not affected by varying pressure differences, which also favors the assumption of a diffusive transport mechanism rather than pore flow. Furthermore, our NEMD simulations provide a detailed analysis of the diffusion-related time lag, revealing an initial transient water transport response and a constant diffusive time lag for all pressure differences. These findings enhance our understanding of water transport mechanisms in membrane systems, underlining the validity of the solution-diffusion model for dense polymeric membranes. The methodology described can be applied to shed light on the discrimination between pore flow and solution-diffusion phenomena.</div></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"5 1","pages":"Article 100095"},"PeriodicalIF":4.9,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Degradation of polycrystalline zeolitic imidazolate framework membrane under reactive plasma conditions 反应等离子体条件下咪唑酸多晶沸石骨架膜的降解

IF 4.9

Journal of Membrane Science Letters Pub Date : 2025-02-27 DOI: 10.1016/j.memlet.2025.100093

Hyungjoon Ji , Wooyoung Choi , Eunji Choi , Yunseong Ji , Minsu Kim , Hwan-Jin Jeon , Dae Woo Kim

{"title":"Degradation of polycrystalline zeolitic imidazolate framework membrane under reactive plasma conditions","authors":"Hyungjoon Ji , Wooyoung Choi , Eunji Choi , Yunseong Ji , Minsu Kim , Hwan-Jin Jeon , Dae Woo Kim","doi":"10.1016/j.memlet.2025.100093","DOIUrl":"10.1016/j.memlet.2025.100093","url":null,"abstract":"<div><div>Polycrystalline layers of metal-organic frameworks (MOFs) are effective for fabricating high-performance membranes, particularly for gas separation. However, the chemical degradation of these polycrystalline layers has not been extensively studied, though it is reasonable to anticipate severe degradation under harsh conditions. Accordingly, we investigated the mechanisms of morphological deformation and chemical structure changes in zeolite imidazolate framework (ZIF)-8 films under highly reactive conditions using plasma. ZIF-8 was selectively chosen among various MOFs due to its widespread use in gas separation applications and its relatively stable chemical bonds. The plasma generated various reactive species, such as ions and radicals, to accelerate the degradation of the ZIF-8 layer. We observed that reactive Ar ions preferentially etch Zn over C, and fluorine-containing radicals chemically react with Zn to form covalent bonds. Notably, we found that the degradation of the polycrystalline layer initially begins at the grain boundaries. However, as defects form on the grain surfaces, the degradation progresses more extensively within the grains than at the grain boundaries.</div></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"5 1","pages":"Article 100093"},"PeriodicalIF":4.9,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electrochemically-driven solid oxide tubular membrane reactor for efficient separation of oxygen and argon 用于高效分离氧和氩的电化学驱动固体氧化物管状膜反应器

IF 4.9

Journal of Membrane Science Letters Pub Date : 2025-01-30 DOI: 10.1016/j.memlet.2025.100092

Yuanhui Tang , Yutao Hu , Sisi Wen , Song Lei , Yakai Lin , Li Ding , Haihui Wang

{"title":"Electrochemically-driven solid oxide tubular membrane reactor for efficient separation of oxygen and argon","authors":"Yuanhui Tang , Yutao Hu , Sisi Wen , Song Lei , Yakai Lin , Li Ding , Haihui Wang","doi":"10.1016/j.memlet.2025.100092","DOIUrl":"10.1016/j.memlet.2025.100092","url":null,"abstract":"<div><div>The high purity of Ar is crucial for industrial applications such as steel production, welding, and laboratory use, while the similar physical properties of O<sub>2</sub> and Ar make their efficient separation challenging. Existing technologies, such as cryogenic distillation and pressure swing adsorption, are well-established and widely utilized but are hindered by high energy consumption, operational complexity, or limited efficiency. Inspired by the principle that O<sub>2</sub> can permeate through the electrolyte as oxygen ions (O<sup>2-</sup>) in a solid oxide electrolysis cell, for the first time, this study designed and developed an electrochemically-driven tubular inorganic membrane reactor to separate O<sub>2</sub>/Ar mixtures, achieving high-purity Ar (≥99.99 %). The tubular membrane reactor featured an anode/electrolyte/cathode sandwich structure, offering a compact design particularly suited for gas separation. The reactor employs Ce<sub>0.1</sub>Gd<sub>0.9</sub>O<sub>2-x</sub> (GDC) as the electrolyte, while GDC and Ba<sub>0.9</sub>Co<sub>0.7</sub>Fe<sub>0.3</sub>Nb<sub>0.1</sub>O<sub>3-x</sub> are used as the electrode materials. The resulting membrane reactor was compact, defect-free, and capable of producing Ar with a purity of 99.99 %. Additionally, under a constant total current of 0.75 A and an operating temperature of 800 °C, the membrane reactor demonstrated stable performance for over 130 hours, maintaining a Faradaic efficiency exceeding 95 %. This study anticipates that the membrane reactor can serve as an effective and practical solution for separating O<sub>2</sub>/Ar mixtures, particularly at low O<sub>2</sub> partial pressures.</div></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":"5 1","pages":"Article 100092"},"PeriodicalIF":4.9,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143292745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Membrane gas separations and energy efficiency: Exploring the selective membrane-piston concept 膜气体分离与能源效率：探索选择性膜活塞概念

IF 4.9

Journal of Membrane Science Letters Pub Date : 2024-12-21 DOI: 10.1016/j.memlet.2024.100091

Mathilde Lafont, Christophe Castel, Romain Privat, Eric Favre

引用次数: 0