Langmuir最新文献

{"title":"Construction of Self-Cleaning Membrane Integrating Underwater Superoleophobicity, Photocatalysis, and Antibacterial Activity for Water Purification","authors":"Fei Sun, Yaxin Zheng, Mengting Li, Wanyu Chen, Tiandi Pan, Yunfei Rao, Ying Zhang","doi":"10.1021/acs.langmuir.4c04311","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c04311","url":null,"abstract":"The treatment of oily wastewater and oil/water mixtures has received more and more attention. In this study, a Zn-MOF (ZIF-8) decorated polyimide (PI) nanofiber membrane with triple self-cleaning performance was constructed, and the decoration of ZIF-8 on the PI membrane improved the hydrophilicity of the composite membrane, which further enhanced the underwater oil resistance, and the mechanical properties of the membranes improved significantly with the increase of in situ growth time. In addition, the inherent photocatalytic and antibacterial properties of ZIF-8 endowed the membranes with fantastic performance. When the in situ growth time was 24 h, the degradation efficiency for methylene blue was nearly 90% within 60 min under visible light. The ZIF-8@PI membrane has significant antibacterial effect against <i>Staphylococcus aureus</i> and <i>Escherichia coli</i>. This triple self-cleaning is an important step forward in both the multifunctional application and sustainable development of materials.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"34 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026878","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}

{"title":"Degradation of Methylene Blue by Ozone Oxidation Catalyzed by the Magnetic MnFe2O4@Co3S4 Nanocomposite","authors":"Tanxia Xiang, Dengjie Zhong, Yongxian Zhou, Yunlan Xu, Danli Tang, Wantao Li, Yuanfang Yang, Chunmiao Fan, Jisai Chen","doi":"10.1021/acs.langmuir.4c04516","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c04516","url":null,"abstract":"In this study, the MnFe₂O₄@Co₃S₄ magnetic nanocomposite was prepared by a two-step hydrothermal method and used to catalyze the ozone oxidation degradation of methylene blue. It was characterized by XRD, EDS, SEM, FT-IR, and XPS. The results showed that the introduction of Co₃S₄ made MnFe₂O₄ grow uniformly on Co₃S₄ nanosheets, which effectively prevented the agglomeration of MnFe₂O₄. Moreover, MnFe₂O₄ provided active sites and Mn³⁺/Mn²⁺ and Fe³⁺/Fe²⁺ cycles for the ozone oxidation process. Not only did Co₃S₄ provide the active site (Co²⁺/Co³⁺) for the ozone oxidation process but also its derived S^2–/S₂^2– accelerated the electron transfer rate on the surface of the material, thus improving the efficiency of catalytic ozone oxidation degradation of methylene blue. When the molar ratio of MnFe₂O₄ to Co₃S₄ was 6:3 (MnFe₂O₄@Co₃S₄-3), the catalytic ozone degradation efficiency of methylene blue was the best, which reached 93.55% in 12 min. The reactive oxygen species in catalytic ozonation degradation of MB were ¹O₂, O₂^<b>.</b>–, and ·OH. The MnFe₂O₄@Co₃S₄ magnetic nanocomposite is an efficient and stable O₃ activator, which maintains high catalytic activity and low metal ion leaching after five cycles, indicating that it has a good application prospect in catalyzing ozone oxidation to degrade organic pollutants.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"19 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026876","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}

{"title":"Hierarchical S-Doped Vanadium MOFs with Multiwalled Carbon Nanotubes: A Robust Bifunctional Catalyst for Efficient Water Electrolysis","authors":"Krishnendu M Nair, Sureka Kanthasamy, Gowrisankar Aruchamy, Selvaraju Thangavelu","doi":"10.1021/acs.langmuir.4c04577","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c04577","url":null,"abstract":"Developing nonprecious metal-based electrocatalysts with exceptional activity and durability for water electrolysis remains a significant challenge. Herein, we report a highly efficient bifunctional electrocatalyst composed of sulfur-doped vanadium metal–organic frameworks (S@V-MOF) integrated with multiwalled carbon nanotubes (MWCNTs) to promote the synergistic effect between S@V-MOF and MWCNTs and modulate the electronic structure of the catalyst, which eventually enhanced its electrocatalytic performance. The S@V-MOF/MWCNT catalyst loaded at the Ni foam electrode exhibits remarkable activity for both the hydrogen evolution reaction (HER) in acidic media and oxygen evolution reaction (OER) in alkaline media, requiring overpotentials of 48 and 227 mV, respectively, to reach a current density of 10 mA cm^–2. Notably, when employed as a bifunctional catalyst in a two-electrode overall water splitting electrochemical cell, the S@V-MOF/MWCNT catalyst-loaded electrode delivers an outstanding cell voltage of 1.53 V at 10 mA cm^–2 with exceptional durability. This work provides a promising strategy for designing cost-effective and efficient electrocatalysts for water electrolysis.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"51 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026877","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}

{"title":"Chalcogen Substitution-Modulated Molecule–Electrode Coupling in Single-Molecule Junctions","authors":"Zitai Jiang, Ming Chen, Shou-Feng Zhang, Lin Wang, Xunshan Liu","doi":"10.1021/acs.langmuir.4c04760","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c04760","url":null,"abstract":"Molecule–electrode interfaces play a pivotal role in defining the electron transport properties of molecular electronic devices. While extensive research has concentrated on optimizing molecule–electrode coupling (MEC) involving electrode materials and molecular anchoring groups, the role of the molecular backbone structure in modulating MEC is equally vital. Additionally, it is known that the incorporation of heteroatoms into the molecular backbone notably influences factors such as energy levels and conductive characteristics. In this work, we report a series of molecular wires that are organized in donor–acceptor–donor configurations, with distinct chalcogen substitutions, including oxygen (BOD), sulfur (BTD), and selenium (BSD). We investigated the electron transport properties using the scanning tunneling microscope break junction (STM-BJ) technique. Our results revealed that both the single-molecule conductance and the junction evolution feature are impacted by the heteroatoms in the benzo(chalcogen)diazole cores. Furthermore, current–voltage (<i>I</i>–<i>V</i>) experiments, combined with theoretical analyses, suggest that MEC plays a dominant role in modulating electron transport behaviors. Overall, our findings provide important insights into the interface-mediated charge transport exerted by chalcogen atoms within molecular devices, thereby enhancing the fundamental comprehension of these critical interactions.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"49 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143030829","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}

{"title":"Drop Dynamics during Condensation on Superhydrophobic Surfaces in Vapor Shear Flow","authors":"Shaur Humayun, R. Daniel Maynes, Julie Crockett, Brian D. Iverson","doi":"10.1021/acs.langmuir.4c04683","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c04683","url":null,"abstract":"Accurate models for predicting drop dynamics, such as maximum drop departure sizes, are crucial for estimating heat transfer rates during condensation on superhydrophobic (SH) surfaces. Previous studies have focused on examining the heat transfer rates for SH surfaces under the influence of gravity or vapor flowing over the surface. This study investigates the impact of surface solid fraction and texture scale on drop mobility in a condensing environment with a humid air flow. Experiments recorded condensation with varying surface feature sizes from micro- to nano scale under different flow rates. Video analysis detected the drop-size distribution and maximum drop departure sizes. Particle image velocimetry (PIV) provided accurate shear force representations. Results showed that the maximum drop departure sizes decreased with lower surface solid fractions and higher flow rates. A force balance analysis revealed that coalescence-induced drop jumping aids drop departure. Different drop behaviors due to coalescence were linked to surface characteristics. The study quantified drop jump distances under shear force during condensation on SH surfaces, and found that jump distances increased when coalescing drop sizes were similar. Based on these findings, a method for tuning SH surfaces to control drop size at coalescence and departure was suggested. Drop mobility was measured in terms of Bond and Capillary numbers, showing a dependence on surface solid fraction and pitch size. By combining these into surface slip length, it was shown that drop mobility increases with increasing slip length.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"34 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143030833","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}

{"title":"Insight into the Enhanced Removal of U(VI) with Fe–Ni Bimetallic Particles Loaded on Biochar","authors":"Yingshan Zhu, Muhammad Shaban, Njud S. Alharbi, Xuemei Ren, Changlun Chen","doi":"10.1021/acs.langmuir.4c04766","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c04766","url":null,"abstract":"This work develops Fe–Ni particles loaded on biochar (Fe–Ni/BC) to remove U(VI) efficiently. Fe–Ni bimetallic particles loaded on biochar (BC) can improve stability and reactivity, and the mesoporous structure of BC can effectively reduce Fe⁰ aggregation. The removal ability of Fe–Ni/BC is higher than that of Fe–Ni, BC, and Fe/BC. With the aid of kinetics and isotherms, the removal data were fitted by the pseudo-second-order kinetic model (<i>R</i>² ≥ 0.999) and Langmuir model (<i>R</i>² ≥ 0.94). Meanwhile, Fe–Ni/BC exhibited the largest removal capacity of 250.78 mg/g for U(VI) at pH 5.0 and a temperature of 303 K. Removing uranium using Fe–Ni/BC was carried out in the following steps: First, U(VI) in the solution was sorbed onto the Fe–Ni/BC surface through chemical bonds. Second, Fe(II) and Fe⁰ contributed to the U(VI) reduction process. At the same time, Fe–Ni formed a primary cell and underwent electron transfer. Moreover, Ni⁰ adsorbed H₂ generated by Fe⁰ corrosion, forming Ni–H to prevent agglomeration and reduce U(VI). The results indicate that Fe–Ni bimetallic particles loaded on biochar enhance the removal of U(VI) by sorption-reduction synergistic effect. This work offers valuable insights into the design of bimetallic nanomaterials for environmental remediation of U(VI) contamination.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"120 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026879","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}

{"title":"Porous Carbon Nanoparticle Composite Paper Fiber with Laser-Induced Graphene Surface Microstructure for Pressure Sensing","authors":"Aoxun Liang, Junlong Zhai, Jixu Zou, Xueye Chen","doi":"10.1021/acs.langmuir.4c04486","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c04486","url":null,"abstract":"In recent years, flexible pressure sensors have played an increasingly important role in human health monitoring. Inspired by traditional papermaking techniques, we have developed a highly flexible, low-cost, and ecofriendly flexible pressure sensor using shredded paper fibers as the substrate. By combining the properties of laser-induced graphene with the structure of paper fibers, we have improved the internal structure of pressure-sensitive paper and designed a conical surface microstructure, providing new insights into nanomaterial engineering. It features low resistance (424.44 Ω), low energy consumption of only 0.367 μW under a pressure of 1.96 kPa, high sensitivity (1.68 kPa^–1), and a wide monitoring range (98 Pa–111.720 kPa). The pressure-sensitive paper with surface microstructure (MFTG) developed in this study has a total thickness comparable to A4 paper, is soft and bendable, can be cut into any shape like paper to fit the human body, and holds great potential for continuous monitoring of human activity status and physiological information.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"2 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143030830","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}

{"title":"Isoelectric Point of Metal Oxide Films Formed by Anodization","authors":"Aydan Yadigarli, Patrick Hartwich, Gabriel Onyenso, Torsten L. Kowald, Merve Kübra Aktan, Annabel Braem, Manuela Sonja Killian","doi":"10.1021/acs.langmuir.4c04635","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c04635","url":null,"abstract":"The surface charge of metal oxides is an important property that significantly contributes to a wide range of phenomena, including adsorption, catalysis, and material science. The surface charge can be predicted by determining the isoelectric point (IEP) of a material and the pH of a solution. Although there have been several studies of the IEP of metal oxide (nano)particles, only a few have reported the IEP of metal oxide films. The IEP of various compact metal oxide films such as TiO₂, Nb₂O₅, WO₃, ZrO₂, NiO, and Al₂O₃ formed via electrochemical anodization was determined using the streaming potential technique. Nanostructured TiO₂ and NiO were additionally produced using a single-step anodization technique, and their IEP was compared with the compact ones. The surface morphology and wettability of the oxides were studied by scanning electron microscopy and contact angle measurements, respectively. X-ray powder diffraction and X-ray photoelectron spectroscopy measurements were carried out to assess the phase and elemental composition, respectively. The IEP of compact anodic oxides deviates from that of their nanoparticle and atomic layer-deposited counterparts. The comparative results indicate that the IEP of metal oxides is influenced by factors such as the chemical composition, degree of hydroxylation, and crystallographic phases of the oxide.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"15 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026922","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}

{"title":"Enzyme-Instructed Interfacial Jamming of Pillar[5]arenes for Macroscopic Signal Amplification","authors":"Mohit Yadav, Anvi Sangwan, Reek Mahapatra, Nidhi Bhardwaj, Kaushik Mondal, Debabrata Patra","doi":"10.1021/acs.langmuir.4c03984","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c03984","url":null,"abstract":"Enzyme-instructed signal generation at liquid–liquid interfaces presents a novel strategy for controlling and detecting biochemical processes on macroscopic scales. Here, we explore the self-assembly and jamming of pillar[5]arene (P[5]A) derivatives at the oil–water interface via a copper-mediated “click” reaction, providing a versatile platform for generating observable signals. The formation of a pillar[5]arenes network at the droplet interface reduces interfacial tension, allowing droplets to adopt various nonequilibrium shapes based on the interfacial jamming process. By varying concentrations of P[5]A derivatives and ascorbic acid (AA), we fine-tune the surface coverage of droplets, offering control over the jamming dynamics. Additionally, we introduce a signal amplification mechanism where the dephosphorylation of a dormant reductant by alkaline phosphatase (ALP) triggers the “click” reaction at the interface. This system enables the quantification of ALP activity through macroscopic surface changes with inhibition of ALP by heavy metals and metal chelators reducing surface coverage. This approach represents a promising method for amplifying molecular signals into detectable macroscopic outputs with potential applications in biochemical sensing and materials science.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"11 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143021003","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}

{"title":"Fundamental Understanding of Bio-Nano Interface of Lysozyme on Psidium guajava Polyphenol Coated Silver Nanoparticles: Mechanistic Insights into the Effect of Protein Corona on the Antibacterial Efficacy","authors":"Kakali Baruah, Ajit Kumar Singh, Sona Lyndem, Kalpana Kumari, Anupam Nath Jha, Atanu Singha Roy","doi":"10.1021/acs.langmuir.4c04832","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c04832","url":null,"abstract":"Recent times have witnessed revolutionary progress in the design and development of functionalized nanomaterials as promising tools for biomedicinal applications. However, the gap in the fundamental understanding of the “biological responses” of the nanomaterials after the formation of “protein-corona” when it is exposed to the body system has drawn a thin line from its discoveries to real clinical trial. In this article we have synthesized two different silver NPs capped with the polyphenols of <i>Psidium guajava</i> (guava) leaf extract and the other with one of its major polyphenolic groups, morin. Then, the formation of “bio-nano interface” of these synthesized AgNPs were illustrated in detail by taking the model carrier protein hen egg white lysozyme (HEWL). The formation of protein corona of HEWL on the surface of the AgNPs was revealed by the increase in the hydrodynamic size and the negative ξ-potential values as well as from the visualization of an ∼1 nm thick light gray layer of HEWL in the TEM micrographs. The binding interaction of surface adsorbed HEWL with the AgNPs was analyzed with various photophysical and molecular dynamics simulation (MD) techniques. HEWL interacted with these polyphenol-assisted AgNPs with moderate binding affinity (<i>K</i>_b ∼ 10⁴ M^–1) in a spontaneous manner with the structural integrity in its native conformation. Though several covalent forces are responsible for protein–NP interaction, electrostatic and hydrophobic forces of attraction played the major role in the complexation of HEWL with Guava L.-AgNPs and Morin-AgNPs, respectively. The lysozyme protein-corona on the synthesized polyphenol-assisted AgNPs altered their biological response as revealed from the reduction of antibacterial activity against pathological Gram-positive (<i>E. faecalis</i>) as well as Gram-negative (<i>E. coli</i>) bacterial strains <i>in vitro</i>.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"12 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143021008","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}