Langmuir最新文献_第9页

Amine Grafting on Silica Nanoparticles in Water: A Systematic Study 纳米二氧化硅在水中胺接枝的系统研究

IF 3.9 2区化学

Langmuir Pub Date : 2026-10-19 DOI: 10.1021/acs.langmuir.6c03900

Alice Gibiino,Roa Bouhamad,Laurent Orgéas,Rachel Auzély-Velty,Mehdi Bouzid,Raphaël Michel

{"title":"Amine Grafting on Silica Nanoparticles in Water: A Systematic Study","authors":"Alice Gibiino,Roa Bouhamad,Laurent Orgéas,Rachel Auzély-Velty,Mehdi Bouzid,Raphaël Michel","doi":"10.1021/acs.langmuir.6c03900","DOIUrl":"https://doi.org/10.1021/acs.langmuir.6c03900","url":null,"abstract":"The amine functionalization of silica nanoparticles (SiNPs) using aminotrialkoxysilanes is typically conducted in organic solvents and is widely applied across diverse fields. Recent studies have demonstrated that this modification can also be achieved in aqueous media at low temperatures; however, the impact of water as the primary solvent on the formation and morphology of alkoxysilane grafting remains unexplored. To address this gap, we systematically investigated the influence of key experimental parameters (including particle size and concentration, the type and concentration of aminoalkoxysilanes, and pH) on grafting efficiency. Our results reveal that the highest amine grafting density in water is achieved using a large excess of (3-aminopropyl)trimethoxysilane (APTMS) in dilute SiNP solutions with relatively large particle diameters (Dh ∼ 150 nm) under basic conditions. The so-modified SiNPs exhibit a smooth surface with a reproducible surface amine density of ∼12 NH2 nm–2 (among the highest recorded in the literature). Such density is attributed to the grafting of short, polymerized aminotrialkoxysilane chains on the silica surface. In addition, while this dense APTMS graft is sensitive to hydrolytic degradation, storage at low temperatures preserves a high grafting density (∼10 NH2 nm–2) over several weeks. This study provides a comprehensive understanding of the experimental conditions governing amine grafting on SiNPs in aqueous media and offers practical guidelines for the preparation of SiNPs with dense amine functionalization.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"11 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149218907","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

A General Method for Controllably Constructing Nanoarray Catalysts of Transition-Metal Nanoparticles Loaded on Zinc Oxide Nanowires 氧化锌纳米线负载过渡金属纳米颗粒可控构建纳米阵列催化剂的一般方法

IF 3.9 2区化学

Langmuir Pub Date : 2026-10-19 DOI: 10.1021/acs.langmuir.6c02867

Hongjin Xia,Jibiao Liu,Zheng Zhang,Zhixuan Yu,Qingyang Li,Dongyang Li

{"title":"A General Method for Controllably Constructing Nanoarray Catalysts of Transition-Metal Nanoparticles Loaded on Zinc Oxide Nanowires","authors":"Hongjin Xia,Jibiao Liu,Zheng Zhang,Zhixuan Yu,Qingyang Li,Dongyang Li","doi":"10.1021/acs.langmuir.6c02867","DOIUrl":"https://doi.org/10.1021/acs.langmuir.6c02867","url":null,"abstract":"An array catalyst is promising to lead the way for future developments of high-performance catalysts, owing to its large specific surface area, excellent activity, stability, and reusability. Herein, a series of new candidates, i.e., the transition-metal nanoparticles supported on zinc oxide nanowires (TM/ZnO), are introduced into this catalytic system. The free-standing TM/ZnO nanoarray catalysts can be controllably constructed on the conductive substrate through a flexible, economical, and scalable approach combining electrodeposition and hydrothermal reaction and exhibit very high photocatalytic activity toward the reduction reaction of nitrate to ammonia. The results demonstrate that the catalytic activity of TM/ZnO primarily originates from iron (Fe), cobalt (Co), nickel (Ni), or copper (Cu) nanoparticles, rather than the ZnO nanoarray and stainless steel substrate. When the structure and composition are very close, the photocatalytic activity of Co/ZnO for the nitrate reduction reaction is significantly superior to those of Cu/ZnO, Ni/ZnO, and Fe/ZnO, possibly owing to its smaller charge-transfer resistance and bigger photocurrent. This universal synthetic methodology paves a novel avenue for developing other ZnO nanoarray-supported metal catalysts, showing great prospects in environmental and energy-related applications.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"37 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149218944","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

Interfacial Hydrogen-Bond Regulation by Phytic Acid and SiO2 for Constructing Robust Dual-CrossLinked Nanocomposite Hydrogels 植酸和二氧化硅对界面氢键的调控构建坚固的双交联纳米复合水凝胶

IF 3.9 2区化学

Langmuir Pub Date : 2026-10-19 DOI: 10.1021/acs.langmuir.6c04525

Yujiao Feng,Xinbin Zhang,Shaohua Zhang,Linlin Zhong,Wenlong Xu

{"title":"Interfacial Hydrogen-Bond Regulation by Phytic Acid and SiO2 for Constructing Robust Dual-CrossLinked Nanocomposite Hydrogels","authors":"Yujiao Feng,Xinbin Zhang,Shaohua Zhang,Linlin Zhong,Wenlong Xu","doi":"10.1021/acs.langmuir.6c04525","DOIUrl":"https://doi.org/10.1021/acs.langmuir.6c04525","url":null,"abstract":"Conventional hydrogels generally suffer from insufficient mechanical strength and structural stability due to limited intermolecular interactions. Herein, a phytic acid (PA)/SiO2 synergistic hydrogen-bond network engineering strategy is proposed to fabricate poly(vinyl alcohol) (PVA)/polyacrylamide (PAM)/PA/SiO2 nanocomposite hydrogels. Unlike traditional PVA/PAM hydrogel systems, PA serves as an interfacial hydrogen-bond-mediating agent to couple SiO2 nanofillers with the PVA/PAM polymer network. The phosphate and hydroxyl groups in PA can simultaneously interact with both the PVA/PAM chains and the silanol groups on the SiO2 surface. Additionally, PA enhances the dispersion stability of SiO2, thereby introducing additional nanoscale interaction sites and forming a synergistic hydrogen-bonding network. Fourier transform infrared spectroscopy (FTIR) and complementary characterizations confirm the formation of extensive intermolecular hydrogen-bonding interactions, revealing the structural regulation mechanism of the hydrogel network. Benefiting from the optimized network architecture, the nanocomposite hydrogel exhibits enhanced mechanical strength, fatigue resistance, antibacterial activity, and highly sensitive strain-sensing performance. Furthermore, an intelligent handwriting recognition system is developed by integrating the hydrogel sensor with machine learning algorithms. This work provides an effective strategy for engineering high-performance multifunctional hydrogels for intelligent sensing applications.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"5 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149210898","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

Interfacial Control Mechanisms of Hydrogen Injection and Transport Behavior in Aquifers under Nanoscale Confinement 纳米尺度约束下含水层注氢输运界面控制机制

IF 3.9 2区化学

Langmuir Pub Date : 2026-10-19 DOI: 10.1021/acs.langmuir.6c04564

Hui Huang,Menglin Chang,Sen Wang,Lei Zhu,Xiaofang Li

{"title":"Interfacial Control Mechanisms of Hydrogen Injection and Transport Behavior in Aquifers under Nanoscale Confinement","authors":"Hui Huang,Menglin Chang,Sen Wang,Lei Zhu,Xiaofang Li","doi":"10.1021/acs.langmuir.6c04564","DOIUrl":"https://doi.org/10.1021/acs.langmuir.6c04564","url":null,"abstract":"The structure of the gas–water interface within the pores of nanoscale aquifers directly influences the injection and transport behavior of hydrogen within the aquifer pores, thereby determining the overall efficiency and storage stability of underground hydrogen storage. In this study, a hydroxylated quartz pore model is developed, and nonequilibrium molecular dynamics simulations are used to systematically investigate the effects of pore size, driving pressure drop, and salt type on the gas–water interface structure, interfacial properties, and hydrogen transport behavior. At 5 nm and 60 MPa, storage efficiency reaches 93%. Salt ions exert dual regulation: low salinity promotes injection while high salinity inhibits it. The NaCl system delivers the most pronounced promotion effect at low concentrations, yet complete injection cannot be achieved at high salinity (30 wt %). For divalent MgCl2 and CaCl2 with stronger hydration capacities, hydrogen can be fully injected only within a salinity range of 10–15 wt %. At 30 wt % salinity, CaCl2 markedly increases gas–water interfacial tension, raising capillary resistance by 44% relative to pure water, to 79.2 MPa, versus 70.3 MPa for the MgCl2 system. Notably, the Na2SO4 system exhibits the strongest inhibition, as SO42– tends to form ion clusters in the pore center, introducing additional steric hindrance, thereby enhancing the inhibitory effect. These results confirm capillary resistance as the primary barrier and the key factor regulated by salts , revealing the microscopic mechanisms by which salt ions and driving pressure drop influence the gas–water interface, providing molecular-level insights into underground hydrogen storage systems.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"88 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149210902","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

Interface-Engineered SnS2/Nb-Doped TiO2 Bilayer Heterostructure for Enhanced Sensitivity to NO2 at Room Temperature 界面工程SnS2/ nb掺杂TiO2双层异质结构在室温下增强对NO2的敏感性

IF 3.9 2区化学

Langmuir Pub Date : 2026-10-19 DOI: 10.1021/acs.langmuir.6c03758

Yangbo Chen,Jian Feng,Jun Min,Shifeng Wang,Jingxiao Liu,Yuwen Bao,Yun Gao,Fengxiang Chen,Lakmini Jayasingha,Sumedha Jayanetti,Xiaohong Xia

{"title":"Interface-Engineered SnS2/Nb-Doped TiO2 Bilayer Heterostructure for Enhanced Sensitivity to NO2 at Room Temperature","authors":"Yangbo Chen,Jian Feng,Jun Min,Shifeng Wang,Jingxiao Liu,Yuwen Bao,Yun Gao,Fengxiang Chen,Lakmini Jayasingha,Sumedha Jayanetti,Xiaohong Xia","doi":"10.1021/acs.langmuir.6c03758","DOIUrl":"https://doi.org/10.1021/acs.langmuir.6c03758","url":null,"abstract":"Nitrogen dioxide (NO2) is a harmful air pollutant that poses serious risks to human health and the environment. Achieving NO2 sensors with high sensitivity, selectivity, and stability at room temperature remains a significant challenge. In this work, we report a room-temperature NO2 sensor based on a SnS2/Nb-doped TiO2 bilayer heterostructure, which exhibits an ultrahigh response and excellent selectivity without the need for external heating or light activation. The sensor was fabricated via a simple hydrothermal method and an impregnation process. The SnS2/0.5% Nb-doped TiO2 bilayer heterostructure (16.7) exhibited a 227.4% increase in response at 10 ppm of NO2 compared with pristine SnS2 (5.1). It attained a response of 4.4 at a low concentration of 5 ppm of NO2 and reached an ultrahigh response of 736.5 at 100 ppm of NO2. The large specific surface area and unique layered structure of SnS2 promote gas diffusion and adsorption. The formation of the heterojunction between SnS2 and Nb-doped TiO2 facilitates the separation and transport of charge carriers and increases the density of active sites for the reactions. Furthermore, we investigated the influence of different metal electrodes on the sensor performance and calculated the corresponding variations in the Schottky barrier height to further elucidate the gas-sensing mechanism. This work offers a promising strategy for designing high-performance, low-power NO2 sensors for real-time environmental monitoring.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"14 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149210899","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

Microscopic Mechanism of Hot Flue Gas Displacement of Coalbed Methane under Thermo-Mechanical Coupling: A Molecular Simulation Perspective 热-力耦合下煤层气热烟气驱替的微观机理：分子模拟视角

IF 3.9 2区化学

Langmuir Pub Date : 2026-10-19 DOI: 10.1021/acs.langmuir.6c04719

Nan Ding,Jianping Wei,Leilei Si,Yihan Gu

{"title":"Microscopic Mechanism of Hot Flue Gas Displacement of Coalbed Methane under Thermo-Mechanical Coupling: A Molecular Simulation Perspective","authors":"Nan Ding,Jianping Wei,Leilei Si,Yihan Gu","doi":"10.1021/acs.langmuir.6c04719","DOIUrl":"https://doi.org/10.1021/acs.langmuir.6c04719","url":null,"abstract":"The High-Temperature Flue Gas Enhanced Permeability and Displacement (HFG-ECBM) technology combines the advantages of low gas source costs and thermal-induced permeability enhancement, making it a key technical approach to overcoming bottlenecks in deep coalbed methane (CBM) extraction. Based on multispectral characterization results, this study constructed a dynamic displacement model of coal nanopores under different stress levels. Using Grand Canonical Monte Carlo (GCMC) and molecular dynamics (MD) simulation methods, the study investigated the microscopic mechanisms of HFG displacement of CBM under thermo-mechanical coupling. The results indicate that as the triaxial stress gradient increases, the coal matrix undergoes significant anisotropic compressive deformation, with porosity decreasing from 10.92% under stress-free conditions to 8.91% under high stress; medium- and large-sized pores close preferentially, and the methane saturation adsorption capacity exhibits a monotonically decreasing trend. The displacement of CBM by HFG exhibits a coupled regulation pattern characterized by “stress-dominated, temperature-modulated” behavior. High ground stress compresses pores and impedes gas migration, causing the diffusion coefficient of HFG to decrease by an average of 62.55% and that of CBM to decrease by 22.3%–24.3%. Increasing temperature weakens the adsorption binding force of CBM and lowers the desorption energy barrier while simultaneously enhancing the diffusion capacity of HFG; this mitigating effect is more pronounced under high ground-stress conditions. The research findings provide a microscopic theoretical basis and a foundation for optimizing parameters in the field application of hot flue gas displacement technology for coalbed methane extraction in deep, high-stress coal seams.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"81 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149218910","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

Hydrogel-Controlled Electropolymerization of Polynorepinephrine through Confined Noncovalent Self-Assembly 通过限制非共价自组装的水凝胶控制聚去甲肾上腺素的电聚合

IF 3.9 2区化学

Langmuir Pub Date : 2026-10-19 DOI: 10.1021/acs.langmuir.6c04478

Agata Smułka,Mirosław Sawczak,Łukasz Gaweł,Piotr Okoczuk,Tadeusz Ossowski,Adrian Olejnik

{"title":"Hydrogel-Controlled Electropolymerization of Polynorepinephrine through Confined Noncovalent Self-Assembly","authors":"Agata Smułka,Mirosław Sawczak,Łukasz Gaweł,Piotr Okoczuk,Tadeusz Ossowski,Adrian Olejnik","doi":"10.1021/acs.langmuir.6c04478","DOIUrl":"https://doi.org/10.1021/acs.langmuir.6c04478","url":null,"abstract":"Polymerization of monomers confined within hydrated polymer networks represents a promising strategy for engineering multifunctional, bioinspired interfaces. However, the role of the hydrogel environment in directing polymer growth and the resulting physicochemical properties remains poorly understood. Here, we demonstrate that chitosan hydrogels act as chemically programmed confined reaction environments that govern the electropolymerization of polynorepinephrine (PNOR). The polymer growth inside the matrix leads to hydrogel restructuring and hierarchical noncovalent self-assembly with only minor changes in the chemical composition of both components. The resulting composite exhibits permanently immobilized catechol/quinone redox centers, enhanced broadband optical absorption, and pronounced fluorescence quenching, demonstrating coupled electrochemical and photophysical functionality. Density functional theory reveals that electrostatic interactions are the main factor driving the composite formation with the supportive role of π–cation and hydrogen bonds. Moreover, oxidation of PNOR from the catechol to quinone state substantially modifies the electronic structure responsible for the observed optical response. The results establish hydrogel-controlled, confinement-driven electropolymerization as a general strategy for programming the electrochemical and optical properties of hydrogel interfaces through controlled molecular organization rather than extensive covalent modification.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"89 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149210900","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

Covalently Grafted Poly(vinylidene fluoride) Copolymer as a Cathode Binder and Its Ionic Conductivity Assessment toward Filler-Free Gel Polymer Electrolyte 共价接枝聚偏氟乙烯共聚物作为阴极粘结剂及其对无填料凝胶聚合物电解质的离子电导率评价

IF 3.9 2区化学

Langmuir Pub Date : 2026-10-19 DOI: 10.1021/acs.langmuir.6c03870

Udayan Basak,Sayan Maji,Subham Ghosh,Imran Sk,Swastik Mondal,Arun K. Nandi,Dhruba P. Chatterjee,Urmimala Maitra

{"title":"Covalently Grafted Poly(vinylidene fluoride) Copolymer as a Cathode Binder and Its Ionic Conductivity Assessment toward Filler-Free Gel Polymer Electrolyte","authors":"Udayan Basak,Sayan Maji,Subham Ghosh,Imran Sk,Swastik Mondal,Arun K. Nandi,Dhruba P. Chatterjee,Urmimala Maitra","doi":"10.1021/acs.langmuir.6c03870","DOIUrl":"https://doi.org/10.1021/acs.langmuir.6c03870","url":null,"abstract":"Polymer materials with covalently grafted pendant functional groups rather than those in a composite state are highly attractive for next-generation rechargeable batteries owing to their ability to provide both mechanical robustness and efficient ion transport. In this work, a multifunctional polymer system poly(vinylidene fluoride)-g-poly[(methacrylic acid)-random-(poly(ethylene glycol) methyl ether methacrylate)] (PVMAPE) was synthesized via atom transfer radical polymerization (ATRP) of tert-butyl methacrylate (t-BMA) and poly(ethylene glycol) methyl ether methacrylate (PEGMEM) after being initiated from a PVDF macroinitiator. Subsequently, the graft copolymer underwent selective hydrolysis of the t-BMA ester moieties to get the desired graft copolymer. X-ray photoelectron spectroscopy confirmed “halogen exchange” on the PVDF backbone prior to grafting, with a substitution level of approximately 8%, generating ATRP initiation sites that enabled homogeneous graft-chain distribution throughout the matrix. The synthesized polymer was first evaluated as a sodium-ion battery cathode binder, delivering an initial discharge capacity of 121.81 mA h g–1 and retaining 75% of its capacity after 100 cycles (90% with respect to the second cycle). Subsequently, it was investigated as a gel polymer electrolyte (GPE) for both lithium- and sodium-ion conduction. Electrochemical impedance spectroscopy revealed maximum ionic conductivities of 1.03 × 10–4 and 4.6 × 10–5 S cm–1 at 343 K, with activation energies of 0.153 and 0.161 eV, respectively. Both the lithium- and sodium-based GPEs exhibited superior ion-transport characteristics, highlighting the versatility of the developed polymer as both an electrochemically active binder and an ion-conducting electrolyte.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"234 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149218909","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

Self-Inflating Volatile Oil-Shell Bubbles and Foams Driven by Interfacial Air Diffusion 界面空气扩散驱动的自膨胀挥发性油壳气泡和泡沫

IF 3.9 2区化学

Langmuir Pub Date : 2026-10-19 DOI: 10.1021/acs.langmuir.6c03871

Ivan U. Vakarelski,Farrukh Kamoliddinov,Sigurdur T. Thoroddsen,Krassimir D. Danov

{"title":"Self-Inflating Volatile Oil-Shell Bubbles and Foams Driven by Interfacial Air Diffusion","authors":"Ivan U. Vakarelski,Farrukh Kamoliddinov,Sigurdur T. Thoroddsen,Krassimir D. Danov","doi":"10.1021/acs.langmuir.6c03871","DOIUrl":"https://doi.org/10.1021/acs.langmuir.6c03871","url":null,"abstract":"Recent studies have shown that bubbles inside a volatile liquid can spontaneously grow in the absence of bulk gas supersaturation through diffusion of air driven by differences in its partial pressure. Here, we demonstrate a distinct manifestation of this phenomenon in which perfluorocarbon oil-shell bubbles, formed following bubble detachment from a perfluorocarbon oil (PP1, F2 Chemicals)–water interface, become trapped and spontaneously expand at the water–air interface. Addition of the anionic fluorosurfactant Capstone FS-60 to the aqueous phase stabilizes the detached oil-shell bubbles at the water–air interface. The bubbles spontaneously grow from an initial diameter of approximately 1.5 mm to several millimeters within a few minutes. The initial growth rate reaches about 11 μm/s, substantially exceeding that observed for bubbles trapped at the PP1–water interface. Bubble-bursting measurements indicate progressive thinning and eventual depletion of the PP1 shell at bubble radii of approximately 2.5–3.0 mm. Bubble growth nevertheless continues after shell depletion as the system transitions into a surfactant-stabilized foam bubble containing PP1 vapor. An interfacial air-diffusion model attributes the enhanced growth to the short diffusion path across the thin liquid film separating the bubble from the atmosphere, driven by the difference in air partial pressure between the PP1-vapor-containing bubble interior and the surrounding atmosphere. Finally, multiple oil-shell bubbles form self-expanding foam clusters that continue to grow for hours, increasing their apparent foam volume by more than 2 orders of magnitude. These findings demonstrate how modifying the mass-transfer geometry of interfacial air diffusion can strongly accelerate bubble growth and enable the formation of self-inflating bubbles and foams under ambient conditions.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"13 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149210901","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

Droplet SpreadingDynamics upon Impact and FreezingTip Offset on Inclined Cold Surfaces 倾斜冷表面上冲击和冻结尖偏移时液滴扩散动力学

IF 3.9 2区化学

Langmuir Pub Date : 2026-10-17 DOI: 10.1021/acs.langmuir.6c04868

Cong Li,Liting Niu,Jiali Wang,Yue Xiong,Haitao Cheng,Quanyi Liu

{"title":"Droplet Spreading\u0000Dynamics upon Impact and Freezing\u0000Tip Offset on Inclined Cold Surfaces","authors":"Cong Li,Liting Niu,Jiali Wang,Yue Xiong,Haitao Cheng,Quanyi Liu","doi":"10.1021/acs.langmuir.6c04868","DOIUrl":"https://doi.org/10.1021/acs.langmuir.6c04868","url":null,"abstract":"Abstract Droplet impact-freezing on inclined cold surfaces produces asymmetric ice accretion. Existing studies focus on qualitative ice morphology and freezing time, while quantitative analysis of hydrodynamic-phase-transition evolution at three-phase interfaces under inclined and supercooling surfaces was relatively less. In this work, experiments of droplet impacting on cold copper substrates were performed under varied substrate temperatures (−10, −20, −30 °C) and inclination angles (0, 23, 30, 45°). By analyzing the stage hydrodynamic and phase-transition behaviors of droplets during spreading, sliding, and freezing, this work clarified how the inclination angle and supercooling dominate droplet motion, contact line evolution, and solidification dynamics. The results reveal that droplet impact evolution undergoes five sequential stages (spreading, sliding, receding, oscillation, and steady infiltration), presenting two final modes of complete adhesion and partial rebound. The dimensionless time parameter Π effectively characterizes the evolution of sliding contact angle and solid–liquid contact line. Decreasing substrate temperature advances heterogeneous nucleation from the late steady infiltration stage to the early postspreading sliding stage. A refined Padé model with a correction coefficient of A = 1.657 is proposed by correcting cold liquid thermophysical properties. A theoretical model based on the principle of force equilibrium is used to predict the sliding distance of a droplet on an inclined cold surface. Freezing tip offset is governed by the competition between gravity-driven sliding and solidification retardation, and the established dimensionless power-law scaling correlation quantitatively describes its variation with key control parameters. The findings provide fundamental insights and design references for optimizing anti-icing strategies of engineering equipment operating in cold and high-altitude environments.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"4 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149210077","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