Langmuir最新文献_第7页

In Situ Observation and Control of P3HT Solution Crystallization under Microfluidic Interfacial Solvent Exchange 微流控界面溶剂交换下P3HT溶液结晶的原位观察与控制

IF 4.4 2区化学

Langmuir Pub Date : 2026-10-20 Epub Date: 2026-08-20 DOI: 10.1021/acs.langmuir.6c04023

Jie Luo, Yuqi Zhang, Xuewei Wei, Haimu Ye, Tianyu Wu

{"title":"In Situ Observation and Control of P3HT Solution Crystallization under Microfluidic Interfacial Solvent Exchange","authors":"Jie Luo, Yuqi Zhang, Xuewei Wei, Haimu Ye, Tianyu Wu","doi":"10.1021/acs.langmuir.6c04023","DOIUrl":"10.1021/acs.langmuir.6c04023","url":null,"abstract":"Solution crystallization plays a central role in determiningthemultiscale organization and functional properties of conjugated polymers.It depends not only on the final solvent composition but also on thepathway by which supersaturation develops. However, resolving howsupersaturation history influences the evolution from dissolved chainsto ordered structures remains challenging because supersaturationdevelops rapidly and heterogeneously during conventional solvent mixing.In this work, microfluidic interfacial solvent exchange is employedto generate a spatially resolved metastable region for poly(3-hexylthiophene)(P3HT) under well-defined nonequilibrium conditions. Acetone diffusionacross a stable laminar interface continuously decreases the localsolvent quality, while the downstream position provides a measureof the nominal residence time experienced by the evolving solution.Reflected bright-field imaging combined with numerical simulationcharacterizes the solvent interdiffusion field, and fluorescence microscopydistinguishes the polymer response from the solvent-induced opticalbackground and tracks its downstream evolution. A detectable transitionoccurs at nominal inlet acetone fractions of approximately 10–15vol %, compared with 15–20 vol % in bulk mixing. Fluorescenceimaging directly reveals the emergence of low-intensity, red-shiftedregions associated with crystalline ordering. Spectroscopic, microscopic,and electron diffraction analyses confirm the formation of anisotropiccrystalline P3HT fibers.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"42 41","pages":"30820–30832"},"PeriodicalIF":4.4,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148805910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Service Durability of PLA Melt-Blown Nonwovens: Roles of Humidity and Airflow Velocity in Degradation and Filtration Performance PLA熔喷非织造布的使用耐久性：湿度和气流速度在降解和过滤性能中的作用

IF 4.4 2区化学

Langmuir Pub Date : 2026-10-20 Epub Date: 2026-10-06 DOI: 10.1021/acs.langmuir.6c03984

Xubo Jiang, Yanyan Lin, Bin Ding, Jianyong Yu, Xianfeng Wang

{"title":"Service Durability of PLA Melt-Blown Nonwovens: Roles of Humidity and Airflow Velocity in Degradation and Filtration Performance","authors":"Xubo Jiang, Yanyan Lin, Bin Ding, Jianyong Yu, Xianfeng Wang","doi":"10.1021/acs.langmuir.6c03984","DOIUrl":"10.1021/acs.langmuir.6c03984","url":null,"abstract":"The energy and environmental challengesassociated withpetroleum-basednonwovens have driven interest in renewable alternatives such as polylacticacid (PLA)-based melt-blown materials. However, their air filtrationperformance is highly sensitive to service conditions due to environmentaldegradation. This study investigates the physicochemical structurechanges and application performance of PLA melt-blown nonwovens basedon a full factorial design of service conditions combining humidity,airflow velocity, particulate matter, and natural microbes. Resultsshowed that PLA melt-blown nonwovens exposed to service conditionsremain in the early stage of degradation and follow first-order kinetics,with a rate constant up to 3.88 × 10–2 h–1, accompanied by a mechanism dominated by surfacedegradation and erosion. A qualitative correlation between the fibersurface degradation mechanism and nonwoven filtration performancewas established based on filter cake formation theory and fiber microstructuralchanges. Two-way analysis of variance revealed that humidity actsas the primary driver of degradation by progressively shifting itsinfluence mechanism from moisture absorption (accounting for 90% ofthe variance in short-term WCA-30s) to severe mechanical erosion andpressure drop (explaining 77% of the variation in yield strength and91% in pressure drop in the long term). Meanwhile, airflow velocitygoverns dynamic filtration performance by determining particle-mediacontact efficiency and inertial impaction, contributing 57% to thevariance in filtration efficiency and 52% to the quality factor inthe long term.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"42 41","pages":"30772–30787"},"PeriodicalIF":4.4,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149091897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Peripheral Structure–Activity Relationships in N-Doped Single-Atom Catalysts Efficient for CO2 Electroreduction 氮掺杂单原子CO2电还原催化剂的外围构效关系

IF 4.4 2区化学

Langmuir Pub Date : 2026-10-20 Epub Date: 2026-10-05 DOI: 10.1021/acs.langmuir.6c03318

Zama Jan, Heqin Guo, Haleem Ud Din, Qiang Wang, Guoping Gao, Yaqiong Su

{"title":"Peripheral Structure–Activity Relationships in N-Doped Single-Atom Catalysts Efficient for CO2 Electroreduction","authors":"Zama Jan, Heqin Guo, Haleem Ud Din, Qiang Wang, Guoping Gao, Yaqiong Su","doi":"10.1021/acs.langmuir.6c03318","DOIUrl":"10.1021/acs.langmuir.6c03318","url":null,"abstract":"ElectrochemicalCO2 reduction reaction (CO2RR) is a promisingroute for the conversion of CO2 intovaluable carbon products. Nitrogen–carbon (NC)-supported single-atomcatalysts (SACs), particularly those with peripheral coordinationgeometries, have attracted considerable attention. In the presentwork, we investigate two N-coordinating Co-SAC geometries, pyridinic(CoPriN4) and pyrrolic (CoProN4), constructedat the periphery of idealized graphene fragments for the CO2-to-CO conversion pathway. Our density functional theory (DFT) calculations,performed within the computational hydrogen electrode (CHE) framework,demonstrate that incorporating five- and six-membered NC ring structuresin the outer shell modulates the inner-shell electronic propertiesof the N-doped systems, influencing electron transfer behavior andinducing d–p hybridization between the Co center and the coordinatingN atoms. In particular, CoProN4 exhibits stronger d–phybridization, resulting in weakened *CO desorption relative to CoPriN4. This electronic modulation optimizes the thermodynamic adsorptionenergies of key intermediates (*COOH and *CO) and thermodynamicallydisfavors the competing hydrogen evolution reaction, thereby loweringthe predicted thermodynamic limiting potential for CO2RR.As the present study is based on static thermodynamic modeling ofidealized graphene fragments and does not account for explicit kineticbarriers or solvent dynamics, the proposed peripheral design strategyoffers a useful thermodynamic perspective for understanding structure–propertyrelationships in NC-supported Co-SACs for electrochemical CO2 reduction.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"42 41","pages":"30620–30631"},"PeriodicalIF":4.4,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149091904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Flexible Nonwoven Fabric Electrodes Based on AgI Nanoparticle-Decorated Reduced Graphene Oxide Hybrid Fibers for High-Performance Supercapacitor 基于AgI纳米粒子修饰还原氧化石墨烯混杂纤维的高性能超级电容器柔性无纺布电极

IF 4.4 2区化学

Langmuir Pub Date : 2026-10-20 Epub Date: 2026-10-09 DOI: 10.1021/acs.langmuir.6c04599

Fei Ye, Xueyan Dang, Rui Zou, Zhifeng Zhang

{"title":"Flexible Nonwoven Fabric Electrodes Based on AgI Nanoparticle-Decorated Reduced Graphene Oxide Hybrid Fibers for High-Performance Supercapacitor","authors":"Fei Ye, Xueyan Dang, Rui Zou, Zhifeng Zhang","doi":"10.1021/acs.langmuir.6c04599","DOIUrl":"10.1021/acs.langmuir.6c04599","url":null,"abstract":"Nonwovengraphene fiber fabrics, as emerging carbon textiles, haveattracted considerable interest for wearable electronic devices. Itremains challenging, however, to realize the green and scalable constructionof nonwoven graphene-based fabric electrodes with areal capacitance.Herein, we report a facile, green strategy to fabricate AgI-decoratedreduced graphene oxide fiber fabrics (rGOFF). The active AgI materialis in situ deposited without intermediate washing steps. This processnot only minimizes chemical waste and processing time but also preservesthe open porous network of the nonwoven architecture, facilitatingefficient ion transport and mechanical robustness. The resulting AgI@rGOFFelectrodes exhibit a remarkable areal capacitance of 1106.56 mF cm–2 in aqueous H2SO4 electrolyteand possess favorable rate capability. When assembled into solid-statesupercapacitors, they deliver an energy density of 58.36 μWh cm–2 and 85.21% capacitance retention after 5000 cycles.By reducing post-treatment processes and enhancing interfacial chargestorage, this work establishes a sustainable and industrially viablepathway for high-performance fabric-based supercapacitors, and theAgI@rGOFF serves as a promising platform for next-generation flexibleelectronics.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"42 41","pages":"31010–31019"},"PeriodicalIF":4.4,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149150905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Competing Colloidal Interactions Govern Polymer Encapsulation of Hydrophobic Iron Oxide Nanoparticles 竞争性胶体相互作用支配疏水氧化铁纳米颗粒的聚合物包封

IF 4.4 2区化学

Langmuir Pub Date : 2026-10-20 Epub Date: 2026-10-08 DOI: 10.1021/acs.langmuir.6c04393

Soumodeep Biswas, Takreem A. Sindhu, Muhammad Salman Haider, Ethayaraja Mani, Sulalit Bandyopadhyay

{"title":"Competing Colloidal Interactions Govern Polymer Encapsulation of Hydrophobic Iron Oxide Nanoparticles","authors":"Soumodeep Biswas, Takreem A. Sindhu, Muhammad Salman Haider, Ethayaraja Mani, Sulalit Bandyopadhyay","doi":"10.1021/acs.langmuir.6c04393","DOIUrl":"10.1021/acs.langmuir.6c04393","url":null,"abstract":"Control over synthesisconditions is necessary to ensure high loadingin polymer-encapsulated iron oxide nanoparticles (P-IONPs) and enablebiomedical applications. While flash nanoprecipitation (FNP) is arobust method to fabricate P-IONPs, very little is known regardingthe response of hydrophobic IONPs to the change in solvent qualityduring FNP and its effect on the nature of encapsulation. In thiswork, we first probe the sizes of oleic acid (OA)-coated IONPs atvarying compositions of water (ϕw) in a tetrahydrofuran(THF)–water mixture through time-based dynamic light scattering(DLS) and cryo-electron microscopy. It was found that OA-IONPs existedas large (micron)-sized clusters in THF, which broke into smallerclusters as ϕw in the solvent mixture increased.A free energy model of clustering is presented to describe the competingrepulsive and attractive interparticle interactions driving the equilibriumcluster sizes (d*) as a function of ϕw. This effect was further pronounced when an aqueous Tween 80 solutionwas added to the dispersion, resulting in individually dispersed IONPsat high ϕw. The d* directly influencedthe nature of P-IONPs produced using FNP at varying aqueous-to-organicflow rate ratios. Finally, a systematic study was performed to investigatethe effects of the concentration of polymer and IONPs, and OA surfacecoverage on IONPs, on the extent and nature of encapsulation. Thefindings suggest the key role of competing colloidal interactionsin governing the fate of synthesized P-IONPs via FNP. The understandingfrom this study would enable the rational design of P-IONPs with high,uniform loading for desired applications.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"42 41","pages":"30942–30953"},"PeriodicalIF":4.4,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149150925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Cation-Dependent Salt Templating of Phenolic Resin-Derived Hierarchical Porous Carbon for High-Performance Supercapacitors 高性能超级电容器用酚醛树脂衍生分层多孔碳的阳离子依赖盐模板

IF 4.4 2区化学

Langmuir Pub Date : 2026-10-20 Epub Date: 2026-10-07 DOI: 10.1021/acs.langmuir.6c04300

Huiping Sun, Jie Li, Yuhang Gao, Ting Liu, Huanli Wang, Wei Xu, Huawei Zhang

{"title":"Cation-Dependent Salt Templating of Phenolic Resin-Derived Hierarchical Porous Carbon for High-Performance Supercapacitors","authors":"Huiping Sun, Jie Li, Yuhang Gao, Ting Liu, Huanli Wang, Wei Xu, Huawei Zhang","doi":"10.1021/acs.langmuir.6c04300","DOIUrl":"10.1021/acs.langmuir.6c04300","url":null,"abstract":"High-surface-area porous carbon electrodes that featurea well-balancedpore distribution and facilitate rapid ion transport are crucial forenhancing electric double-layer capacitors. Conventional phenolicresin-derived carbons are usually dominated by micropores and showlimited pore connectivity, which restricts electrolyte infiltrationand rate performance. Herein, we report a cation-dependent salt-templatingstrategy by introducing equimolar ZnCl2, MgCl2, and MnCl2 into a resorcinol–hexamethylenetetraminehydrothermal system. The three divalent cations direct markedly differentcarbon-framework evolution. Zn2+ mainly promotes microporeformation and smaller carbon spheres, Mg2+ favors particlefusion and larger pores, whereas Mn2+ converts discretemicrosphere assemblies into a continuous three-dimensional hierarchicalporous network. Among the resulting samples, PC-Mn exhibits a specificsurface area of 1459 m2 g–1, a totalpore volume of 1.12 cm3 g–1, and a microporesurface area measuring 1105 m2 g–1, alongwith well-developed mesoporous channels ranging from 2 to 4 nm. Whentested in 6 M KOH, PC-Mn reaches a capacitance of 270.15 F g–1 and maintains 182.49 F g–1 at a current densityof 20 A g–1, achieving a capacitance retention of95.6% following 10,000 cycles. Furthermore, the PC-Mn symmetric supercapacitorexhibits a specific capacitance of 252.04 F g–1 andan energy density of 21.24 Wh kg–1 at a power densityof 20,123 W kg–1. These results demonstrate thatregulating the divalent cation species in salt-templated phenolicresin systems provides an effective approach for tailoring hierarchicalpore structures and improving the electrochemical performance of porouscarbon electrodes.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"42 41","pages":"30902–30911"},"PeriodicalIF":4.4,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149150929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Transition in the Driving Mechanism of Self-Propelled Liquid Marbles Containing an Aqueous Alcohol Solution 含酒精溶液的自推进液体弹珠驱动机理的转变

IF 4.4 2区化学

Langmuir Pub Date : 2026-10-20 Epub Date: 2026-10-08 DOI: 10.1021/acs.langmuir.6c04030

Tomonori Nomoto, Haruka Yamaguchi, Takeru Toyofuku, Luca Chiari, Taro Toyota, Masanori Fujinami

{"title":"Transition in the Driving Mechanism of Self-Propelled Liquid Marbles Containing an Aqueous Alcohol Solution","authors":"Tomonori Nomoto, Haruka Yamaguchi, Takeru Toyofuku, Luca Chiari, Taro Toyota, Masanori Fujinami","doi":"10.1021/acs.langmuir.6c04030","DOIUrl":"10.1021/acs.langmuir.6c04030","url":null,"abstract":"Theself-propulsion mechanisms of liquid marbles containing aqueousalcohol solutions are investigated, with particular focus on the transitionfrom the initial acceleration to the steady-state motion. By combiningsurface tension measurements using quasi-elastic laser scattering(QELS) and tracer particle visualization, we quantitatively analyzethe relationship between interfacial forces and flow fields. In steady-stateconstant-speed motion, both measurements demonstrate that the propulsionis primarily driven by the surface tension difference between thefront and rear sides of the liquid marbles. In contrast, during theinitial acceleration phase, the forward Marangoni flow was found toexceed the propulsion velocity, indicating a significantly increasedcontribution of the forward flow to self-propulsion. The comparisonbetween the propulsion velocity and the surrounding flow velocityreveals that the dominant driving mechanism switches from flow-drivenpropulsion in the acceleration regime to surface tension-driven propulsionin the steady and deceleration regimes. This work provides experimentalevidence of a temporal transition in propulsion mechanisms and offersnew insights into how self-propelled systems reach steady-state motion.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"42 41","pages":"30811–30819"},"PeriodicalIF":4.4,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149150933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Unveiling NOx-to-N2 Conversion Mechanisms over Nickel Single-Atom Catalysts under Ammonia Combustion Conditions: DFT and Microkinetic Study 揭示氨燃烧条件下镍单原子催化剂上nox - n2转化机理：DFT和微动力学研究

IF 3.9 2区化学

Langmuir Pub Date : 2026-10-20 DOI: 10.1021/acs.langmuir.6c04506

Chunlan Qin,Bingzhi Liu,Zhenjian Jia,Shanshan Ruan,Yongjie Ding,Weixing Zhou,Lidong Zhang

{"title":"Unveiling NOx-to-N2 Conversion Mechanisms over Nickel Single-Atom Catalysts under Ammonia Combustion Conditions: DFT and Microkinetic Study","authors":"Chunlan Qin,Bingzhi Liu,Zhenjian Jia,Shanshan Ruan,Yongjie Ding,Weixing Zhou,Lidong Zhang","doi":"10.1021/acs.langmuir.6c04506","DOIUrl":"https://doi.org/10.1021/acs.langmuir.6c04506","url":null,"abstract":"Catalytic conversion of NOx to N2 under ammonia combustion conditions remains challenging because efficient catalysts must simultaneously achieve sufficient NO adsorption and rapid N–O activation, two requirements that are often intrinsically coupled. Herein, density functional theory calculations combined with microkinetic simulations were employed to investigate the conversion pathways of NO-derived species over single-atom catalysts anchored on N-coordinated vacancy graphene. A series of transition-metal SACs were evaluated using H2O adsorption free energy as a prescreening descriptor for competitive H2O occupation, after which Ni-based catalysts were selected for detailed coordination-dependent mechanistic investigation. Although Ni@Vc–N2–Gr does not exhibit the strongest NO adsorption, it delivers the lowest energy barrier by maximizing electron back-donation from Ni to the NO 2π* antibonding orbital. Electronic structure analyses demonstrate that dual-N coordination reconstructs the local electronic environment of the Ni center, enhancing antibonding orbital occupation while maintaining moderate adsorption strength. This feature enables a decoupling of NO adsorption and activation, significantly weakens the N–O bond, and lowers the barrier for N2O decomposition and N2 formation. Consequently, Ni@Vc–N2–Gr exhibits the lowest overall reaction barrier (0.53 eV), outperforming both other coordination environments and Ni3 cluster. Microkinetic analysis further shows that Ni@Vc–N2–Gr exhibits favorable elementary-step kinetics for N2O decomposition and N2 formation, consistent with the enhanced electron back-donation induced by the dual-N coordination environment. This work identifies electron-back-donation-driven adsorption–activation decoupling as a key descriptor governing NOx reduction and provides a coordination-engineering strategy for designing highly efficient single-atom catalysts for deep denitrification.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"45 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Inadequacy of Two-Drop Studies in Explaining Chaining in Emulsion Systems under AC Electric Fields 两滴研究在解释乳状液体系在交流电场作用下的链化方面的不足

IF 4.4 2区化学

Langmuir Pub Date : 2026-10-20 Epub Date: 2026-10-06 DOI: 10.1021/acs.langmuir.6c03467

Sandesh P. More, Praveen Soni, Rochish Thaokar

{"title":"Inadequacy of Two-Drop Studies in Explaining Chaining in Emulsion Systems under AC Electric Fields","authors":"Sandesh P. More, Praveen Soni, Rochish Thaokar","doi":"10.1021/acs.langmuir.6c03467","DOIUrl":"10.1021/acs.langmuir.6c03467","url":null,"abstract":"Efficient dewatering of crude oil emulsions is oftenhindered bydroplet chaining, yet the mechanisms responsible for the strong tendencyto chain at low electric capillary numbers (Cae ≤0.02) remain unclear. Here, we combine high-speed microscopy and numericalsimulations to investigate the frequency-dependent dynamics of multi-dropletchains in AC electric fields. At high frequencies (1 kHz), chainingis shown to be a dynamic process in which transient liquid bridgesform through coalescence of interstitial droplets with neighboringprimary droplets and subsequently break via Rayleigh–Plateauinstability. We propose that these bridges act as temporary electricalshorts, locally eliminating the electric field and thereby the stressesin the bridge, and enabling repeated bridge breakup due to Rayleigh–Plateauinstability, while preserving chain integrity. Unlike classical two-droptheories, this mechanism does not require large cone angles or activepulling forces. Reducing the frequency to 1 Hz enhances droplet deformation,electrophoretic motion, and electrohydrodynamic (EHD) flows, leadingto misalignment, asymmetric coalescence, and chain collapse, consistentwith particle-based simulations. Conductive impurities, such as lintfibers, are further shown to stabilize non-coalescence by providingpermanent electrical pathways that suppress dipolar attraction andpromote electrophoretic repulsion. These findings establish a microhydrodynamicframework for multi-droplet interactions in emulsions and provideinsights for improving the performance of industrial electrocoalescers.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"42 41","pages":"30632–30645"},"PeriodicalIF":4.4,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149091895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Hydrophobic Microfibrillated Cellulose Aerogels via Dual-Silane Modification for Sustainable Oil Spill Recovery 疏水微纤化纤维素气凝胶双向硅烷改性用于溢油可持续回收

IF 4.4 2区化学

Langmuir Pub Date : 2026-10-20 Epub Date: 2026-10-05 DOI: 10.1021/acs.langmuir.6c03349

Ninoska Isabel Bojorge Ramirez, Isabela Rosa Marchette, Bárbara Cristina Rodrigues, Eliana Mosse Alhadeff, Marta Cecilia Tapia Reyes, Ruan Stevan de Almeida Ribeiro, Troner Assenheimer de Souza, Juan Manuel Pardal, Felipe Silva Semaan

{"title":"Hydrophobic Microfibrillated Cellulose Aerogels via Dual-Silane Modification for Sustainable Oil Spill Recovery","authors":"Ninoska Isabel Bojorge Ramirez, Isabela Rosa Marchette, Bárbara Cristina Rodrigues, Eliana Mosse Alhadeff, Marta Cecilia Tapia Reyes, Ruan Stevan de Almeida Ribeiro, Troner Assenheimer de Souza, Juan Manuel Pardal, Felipe Silva Semaan","doi":"10.1021/acs.langmuir.6c03349","DOIUrl":"10.1021/acs.langmuir.6c03349","url":null,"abstract":"Oil spills in marine waters threaten sensitive ecosystems.Thishighlights the need for effective cleanup methods. While cellulose-basedaerogels absorb oil effectively, improving their water resistancewithout compromising their eco-friendliness remains essential. Thisstudy aims to produce hydrophobic aerogels by combining methyltrimethoxysilane(MTMS) and octadecyltrimethoxysilane (OTMS) to create a hierarchicalsurface with low surface energy and high hydrophobicity. The goalis to modify them and compare their performance with bleached andbrown microfibrillated cellulose (MFC). The resulting aerogels havewater contact angles of 133.68° ± 1.16° and show excellentselective oil absorption. The bleached MFC aerogel has absorptioncapacities of 20.2 g g–1 for cooking oil, 15.6 gg–1 for diesel, and 13.3 g g–1 for petroleum, with low water absorption of 5.2 g g–1. In comparison, the brown MFC aerogel performs similarly, absorbing17.1 g g–1 for cooking oil, 14.9 g g–1 for diesel, and 12.4 g g–1 for petroleum, witheven lower water absorption (0.5 g g–1). These renewableMFC aerogels selectively take up oil from oil–water systemsand provide a laboratory-scale basis for further evaluation in remediationsettings such as Guanabara Bay.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"42 41","pages":"30646–30662"},"PeriodicalIF":4.4,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149091902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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