Faraday Discussions最新文献_第9页

Nonlinear ion transport in a 2D Janus membrane with an angstrom pore: memristive and negative differential resistance phenomena. 具有埃孔的二维Janus膜中的非线性离子输运：忆阻和负微分电阻现象。

IF 3.1 3区化学

Faraday Discussions Pub Date : 2026-09-04 DOI: 10.1039/d5fd00130g

Mohan Teja Dronadula, Narayana R Aluru

引用次数: 0

Ambient stability and surface adhesion of 2D polyaramid nanofilms. 二维聚酰胺纳米膜的环境稳定性和表面附着力。

IF 3.1 3区化学

Faraday Discussions Pub Date : 2026-09-04 DOI: 10.1039/d6fd00034g

Michelle Quien, Cody L Ritt, Sanjay S Garimella, Zitang Wei, Mohan T Dronadula, Narayana R Aluru, Michael S Strano

{"title":"Ambient stability and surface adhesion of 2D polyaramid nanofilms.","authors":"Michelle Quien, Cody L Ritt, Sanjay S Garimella, Zitang Wei, Mohan T Dronadula, Narayana R Aluru, Michael S Strano","doi":"10.1039/d6fd00034g","DOIUrl":"10.1039/d6fd00034g","url":null,"abstract":"Two-dimensional polyaramids (2DPAs) represent an emerging class of solution-synthesized, molecularly thin polymer sheets that combine the exceptional in-plane mechanical strength and barrier performance of conventional 2D materials with the synthetic versatility of organic polymers. Despite increasing interest in 2D polymers as gas barriers and membrane materials, the long-term stability of nanometer-scale suspended films remains largely unexplored. Here, we report the first longitudinal study of 2D polyaramid (2DPA-1) nanofilm bulges monitored continuously for over 1000 days. Using a microwell bulge test platform integrated with atomic force microscopy and optical interferometry, we show that 2DPA-1 forms highly stable, gas-retaining membranes whose upward deflection persists for years under ambient environmental fluctuations. Using a single-point mechanical model with thermodynamic analysis, we show that initial bulge pressurization proceeds through transient rim seal opening, while the intact seal remains robust during thermal cycling up to 120 °C without measurable gas loss. Together, these results establish a comprehensive mechanistic framework for long-term stability, permeability assessment, and interfacial failure modes in nanofilm bulge systems. This framework enables reliable interpretation of bulge test data and provides design principles for next-generation 2D polymer membranes intended for ultrahigh-barrier, filtration, and separation technologies.","PeriodicalId":76,"journal":{"name":"Faraday Discussions","volume":" ","pages":"27-43"},"PeriodicalIF":3.1,"publicationDate":"2026-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148300228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electrostatic screening in nanotubes: a tubular response function framework. 纳米管静电筛选：管状响应函数框架。

IF 3.1 3区化学

Faraday Discussions Pub Date : 2026-09-04 DOI: 10.1039/d5fd00148j

Peter Gispert, Nikita Kavokine

{"title":"Electrostatic screening in nanotubes: a tubular response function framework.","authors":"Peter Gispert, Nikita Kavokine","doi":"10.1039/d5fd00148j","DOIUrl":"10.1039/d5fd00148j","url":null,"abstract":"The structure and transport of electrolytes in nanoscale channels are known to be affected by the electronic properties of the confining walls. This influence is particularly pronounced in quasi-one-dimensional nanotubes, where the high surface-to-volume ratio makes the wall the dominant source of electrostatic screening. For instance, ideal metallic tubes suppress long-range Coulomb interactions between ions exponentially. Yet, there exists no generic framework for evaluating electrostatic interactions in tubular confinement. Here, we introduce tubular response functions - a generalisation of surface response functions that captures how nanotubes with arbitrary electronic properties screen Coulomb interactions. Using this framework, we evaluate the interaction potential of ions confined in a metallic carbon nanotube, treating its long-range electronic properties exactly within a Luttinger liquid model. We demonstrate that the screening characteristic of metallic armchair carbon nanotubes is almost identical to that of an ideal metal, regardless of electron density. We trace the origin of such strong screening to the quantum confinement of electrons around the tube circumference and to the suppression of Friedel oscillations. Our framework opens the way for quantitative descriptions of ionic correlations and charge storage in nanotube-based electrodes, and can be further extended to address confined ion dynamics.","PeriodicalId":76,"journal":{"name":"Faraday Discussions","volume":" ","pages":"113-130"},"PeriodicalIF":3.1,"publicationDate":"2026-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147985478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

When does nanofluidic memory disappear? Understanding and reinstating memristive behavior of ionic liquids in two-dimensional nanochannels. 纳米流体存储器何时消失？理解和恢复离子液体在二维纳米通道中的忆阻行为。

IF 3.1 3区化学

Faraday Discussions Pub Date : 2026-09-04 DOI: 10.1039/d5fd00142k

Abdulghani Ismail, Jing Yang, Kalluvadi Veetil Saurav, Louis A Maduro, Hiran Jyothilal, Robert A W Dryfe, Ashok Keerthi, Boya Radha

{"title":"When does nanofluidic memory disappear? Understanding and reinstating memristive behavior of ionic liquids in two-dimensional nanochannels.","authors":"Abdulghani Ismail, Jing Yang, Kalluvadi Veetil Saurav, Louis A Maduro, Hiran Jyothilal, Robert A W Dryfe, Ashok Keerthi, Boya Radha","doi":"10.1039/d5fd00142k","DOIUrl":"10.1039/d5fd00142k","url":null,"abstract":"Nanofluidic memristors rely on ionic transport in confined nanochannels that depends on the history of the applied voltage, producing pinched hysteresis loops. Yet the conditions under which this memory emerges or disappears remain poorly understood. Here, we investigate the role of the solvent in tuning ion-ion correlations and assess the necessity of asymmetric boundary conditions for generating memristive behavior in ångström-scale two-dimensional (2D) nanochannels. With this nanochannel platform, previously shown to yield four distinct loop styles with aqueous electrolytes, we replace water with room-temperature ionic liquids (RTILs) and RTIL/solvent mixtures. Pure EMIM-TFSI exhibits only non-pinched capacitive I-V loops, demonstrating that extreme confinement alone is insufficient to induce ionic memory. Introducing a molecular solvent (such as acetonitrile) or applying compositional asymmetry (salt-concentration gradients) restores pinched hysteresis. These results identify solvent dielectric properties, miscibility, and ion-correlation strength as key control parameters for enabling or suppressing ionic memory in nanochannels, even under strong confinement. Our findings provide both mechanistic insight into ionic memristor behavior and practical methods for controlling hysteresis in nanofluidic devices.","PeriodicalId":76,"journal":{"name":"Faraday Discussions","volume":" ","pages":"446-463"},"PeriodicalIF":3.1,"publicationDate":"2026-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147808535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photo-modulation of proton/water transmembrane transport through bis(imidazole-amide)-tetrafluoro-azobenzene switch. 通过双（咪唑-酰胺）-四氟-偶氮苯开关光调制质子/水跨膜运输。

IF 3.1 3区化学

Faraday Discussions Pub Date : 2026-09-04 DOI: 10.1039/d5fd00115c

Paras Wanjari, Ioan Stroia, Mihail Barboiu

{"title":"Photo-modulation of proton/water transmembrane transport through bis(imidazole-amide)-tetrafluoro-azobenzene switch.","authors":"Paras Wanjari, Ioan Stroia, Mihail Barboiu","doi":"10.1039/d5fd00115c","DOIUrl":"10.1039/d5fd00115c","url":null,"abstract":"Water and proton transport across biological membranes is essential for cellular function. The development of stimuli-responsive artificial transport systems to replace malfunctioning protein channels is crucial for potential therapeutic applications. Here, we report a photoswitchable azobenzene-based channel that envelops a coherent water wire and efficiently regulates water and proton transport across lipid bilayers using light as an external trigger. The molecule undergoes reversible E ↔ Z photoisomerization, where the Z-isomer adopts a compact, folded, π-stacked conformation encapsulating and stabilizing a water wire that can assemble into a well-defined, directional channel. In contrast, the E-isomer forms an extended, less ordered conformation that disrupts coherent water alignment. The synthesised proton/water transporter demonstrates robust photoswitching behavior, maintaining function over multiple irradiation cycles. Ion transport assays reveal complete rejection of alkali metal cations for both isomers, with no detectable ion transport even in the presence of the protonophore FCCP. Proton transport assays in the presence of valinomycin show that the Z-isomer exhibits a 100% increase in electrogenic proton transport rate compared to the E-isomer at higher concentrations. Water permeability measurements mirror this trend, with the Z-isomer showing 20-35% higher net water transport relative to the E-form. These results highlight how photo-controlled conformational changes in foldamer architecture can be leveraged to create efficient, light-regulated water and proton channels.","PeriodicalId":76,"journal":{"name":"Faraday Discussions","volume":" ","pages":"217-227"},"PeriodicalIF":3.1,"publicationDate":"2026-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147757814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Decoding ultrafast water transport in graphene oxide. 解码氧化石墨烯的超快水传输。

IF 3.1 3区化学

Faraday Discussions Pub Date : 2026-09-04 DOI: 10.1039/d5fd00121h

Vikas Yadav, Sangram Kishor Behera, Anjan Das, Chitti Venkata Krishnamurthy, Manu Jaiswal

{"title":"Decoding ultrafast water transport in graphene oxide.","authors":"Vikas Yadav, Sangram Kishor Behera, Anjan Das, Chitti Venkata Krishnamurthy, Manu Jaiswal","doi":"10.1039/d5fd00121h","DOIUrl":"10.1039/d5fd00121h","url":null,"abstract":"Ultrafast water transport through the lamellar arrangement of flakes in graphene oxide is well established, but its origin has been debated in the literature. Here, we comprehensively examined water transport through graphene oxide membranes with sorption and permeation experiments across the entire RH interval, with varied membrane thicknesses and flake sizes. A series of experiments is necessitated since the diffusion process is influenced by the geometric tortuosity of pathways, degree of nano-confinement and associated surface interactions. The ratio of in-plane and out-of-plane Fickian diffusion coefficients, D2D/Dout ∼ 102, which indicates that the water transport pathways have a tortuosity with an average step-size that is significantly smaller than the flake size. This is attributed to the presence of pinholes on the basal plane of graphene oxide. The thermodynamic correction to the Fickian D2D is used to estimate the Maxwell-Stefan diffusion coefficient for in-plane transport of confined water, DMS, which is a fundamental parameter representing molecular mobility. DMS increases monotonically with the interlayer spacing of graphene oxide, which suggests a decrease in the frictional forces exerted by the confining walls on the diffusing molecules. Moreover, DMS < 1.0 × 10-9 m2 s-1 is lower than the self-diffusion coefficient of bulk water, and is typical of hydrophilic nanoporous systems. The large permeation rate is thus reconciled as a consequence of large sorption capacity, despite a modest DMS. Finally, we also examined transport scenarios with single-sided condensation of water on the graphene oxide surface. A comparison of the permeation rates with the sorption-diffusion experiments is presented.","PeriodicalId":76,"journal":{"name":"Faraday Discussions","volume":" ","pages":"150-168"},"PeriodicalIF":3.1,"publicationDate":"2026-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147939127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photo-modulated fluidic channels for precise delivery of ions and molecules. 用于离子和分子精确输送的光调制流体通道。

IF 3.1 3区化学

Faraday Discussions Pub Date : 2026-09-04 DOI: 10.1039/d5fd00131e

Kiran Mayawad, Sonali Roy, Bipasha Saikia, Dibakar Das, Kalyan Raidongia

{"title":"Photo-modulated fluidic channels for precise delivery of ions and molecules.","authors":"Kiran Mayawad, Sonali Roy, Bipasha Saikia, Dibakar Das, Kalyan Raidongia","doi":"10.1039/d5fd00131e","DOIUrl":"10.1039/d5fd00131e","url":null,"abstract":"Fabrication of remote-controlled ion and molecule delivery devices with sub-nanomolar accuracy possesses enormous potential for application in futuristic areas like bio-sensing, molecular machines, energy storage/harvesting, separation, and purification. Here, we combined the excellent photothermal characteristics of oxidised multiwalled carbon nanotubes (o-CNT) with atomically thin 2D sheets of V2O5 (VO) to fabricate fluidic devices capable of discharging ions and molecules with sub-nanomolar accuracy. Remarkably, the delivery of ionic/molecular pulses can be remotely modulated through irradiation with IR light. The heterostructured fluidic membrane (HFM), fabricated as a bilayer membrane with distinctive regions of o-CNT and VO, can continuously deliver K+ ions at the rate of ∼0.58 nmol min-1. The ionic flow rate can be further tuned by modulating the thickness and composition of the HFM. Moreover, triangular HFM can discharge ions in nanomolar pluses (∼1.85 to 6.92 nmol per pulse) when remotely triggered through light of different intensities. Likewise, the intermixed fluidic membrane (IFM), fabricated through vacuum filtration of the homogeneous mixtures of the VO and o-CNT, can discharge biologically relevant molecules like tryptophan (Trp) and aspirin at a rate as low as 0.1 nmol min-1, which can be further modulated with light and heat.","PeriodicalId":76,"journal":{"name":"Faraday Discussions","volume":" ","pages":"228-244"},"PeriodicalIF":3.1,"publicationDate":"2026-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147939062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Concluding remarks: Molecular and ion flows through angstrom-scale channels: bridging theory, simulation, and experiment. 结束语：分子和离子在埃级通道中的流动：桥接理论、模拟和实验。

IF 3.1 3区化学

Faraday Discussions Pub Date : 2026-09-04 DOI: 10.1039/d6fd00114a

Aleksandra Radenovic

{"title":"Concluding remarks: Molecular and ion flows through angstrom-scale channels: bridging theory, simulation, and experiment.","authors":"Aleksandra Radenovic","doi":"10.1039/d6fd00114a","DOIUrl":"10.1039/d6fd00114a","url":null,"abstract":"These concluding remarks report on a Faraday Discussion in which angstrom-scale confinement emerged not as a geometric extension of bulk behaviour but as a qualitatively distinct thermodynamic and kinetic regime, with emerging evidence that some of its anomalies may have quantum origins. Opened by the Spiers Lecture of Prof. Lydéric Bocquet, the Discussion covered four sessions: structure and dynamics of confined molecules; stimuli-responsive transport; molecular and ion sieving; and iontronics and emergent neuromorphic effects. Machine-learning molecular dynamics at first-principles accuracy revealed a sharp three-layer structural transition in confined water and asymmetric solvation of OH- and H3O+ under hBN confinement. Active transport control has been demonstrated using light, strain, mechanical force, and solvent composition. Across these studies, surface chemistry and confinement consistently act together, emerging as the main determinants of ion selectivity. In iontronics, memristive-like behaviour has been reported across a remarkably broad range of mechanisms and an even wider variety of nanofluidic platforms, suggesting that such responses may be a pervasive feature of ionic systems whenever coupled transport, interfacial dynamics, and memory effects coexist. Reported origins include asymmetric ion-pair kinetics, energy-barrier rectification in funnel channels, confined water-dipole ordering, coupled capacitive-inductive memory effects, asymmetric electrochemical reactions, and other history-dependent ion-gating and interfacial processes. Across all sessions, a broad consensus emerged that progress on the most important open questions in water/ion transport will depend on close interplay between theory and experiment. At the same time, there was a strong sense that nanofluidics has reached a level of maturity that now makes these challenges tractable, reinforcing a broader excitement across the field.","PeriodicalId":76,"journal":{"name":"Faraday Discussions","volume":" ","pages":"530-541"},"PeriodicalIF":3.1,"publicationDate":"2026-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148808096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Iontronics and emergent neuromorphic effects under angstrom-confinement: general discussion. 在埃约束下的离子电子学和涌现的神经形态效应：一般讨论。

IF 3.1 3区化学

Faraday Discussions Pub Date : 2026-09-04 DOI: 10.1039/d6fd90019d

Narayana R Aluru, Nicholas X Armendarez, Mihail Barboiu, Hélène Berthoumieux, Lydéric Bocquet, Boya Radha, Raman Dhiman, Robert A W Dryfe, Theo Emmerich, Aida Fica, Peter Gispert, Raj Kumar Gogoi, Abdulghani Ismail, Manu Jaiswal, Tim M Kamsma, Alexei A Kornyshev, Manish Kumar, Aleksandr Noy, Ignacio Pagonabarraga, Siddhi Vinayak Pandey, Aditya Shivaji Patwari, Susan Perkin, Aleksandra Radenovic, Sabiar Rahaman, Kalyan Raidongia, Khushwant Singh, René van Roij, Yanbo Xie

引用次数: 0

Ionic memory or electrode artefacts? A systematic assessment of nanofluidic memristors. 离子记忆还是电极人工制品？纳米流体忆阻器的系统评价。

IF 3.1 3区化学

Faraday Discussions Pub Date : 2026-09-04 DOI: 10.1039/d5fd00135h

Siddhi Vinayak Pandey, Kalluvadi Veetil Saurav, Solleti Goutham, Anshu Sharma, Ashok Keerthi, Boya Radha

{"title":"Ionic memory or electrode artefacts? A systematic assessment of nanofluidic memristors.","authors":"Siddhi Vinayak Pandey, Kalluvadi Veetil Saurav, Solleti Goutham, Anshu Sharma, Ashok Keerthi, Boya Radha","doi":"10.1039/d5fd00135h","DOIUrl":"10.1039/d5fd00135h","url":null,"abstract":"Nanofluidic memristors have recently emerged as a promising alternative to mimic brain-like synaptic functions for neuromorphic applications. Here, we observed that when fluidic devices such as nanoporous membranes are measured with Ag/AgCl electrodes, pinched hysteresis in current-voltage (I-V) loops can be generated even when there is no intrinsic ionic memory behaviour. The nanoporous membranes like nitrocellulose/mixed-cellulose ester (MCE) and polyvinylidene fluoride (PVDF) show memory signatures including pinched I-V loops, nonlinearity, and frequency dependent variation in loop area with Ag/AgCl electrodes, whereas the I-V response became purely capacitive when platinum or glassy carbon electrodes were used in two/three-electrode configurations. The same hysteresis could also be reproduced in a bulk electrolyte without any membrane, confirming its origin due to the Ag ⇌ AgCl redox reaction and salt deposition. In contrast, nanochannel devices made by van der Waals assembly of 2D materials retained their characteristic memory loops regardless of the chosen electrode material. These results show that electrode effect can mimic fundamental memristive signatures and therefore highlight the importance of electrode control to develop reliable, energy efficient fluidic computing architectures.","PeriodicalId":76,"journal":{"name":"Faraday Discussions","volume":" ","pages":"487-499"},"PeriodicalIF":3.1,"publicationDate":"2026-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147831084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0