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Biomimetic Construction of Robust and Multifunctional-Integrated Superhydrophobic Coatings on Steel Structures via a One-Step Spraying Technique. 一步喷涂技术在钢结构上仿生构建坚固多功能一体化超疏水涂层。
IF 3.9 2区 化学
Langmuir Pub Date : 2025-05-21 DOI: 10.1021/acs.langmuir.5c00077
Haidi Li,Meihuan Gao,Zhenlin Tang,Mengru Zhang,Ying Song,Xinqiang Wu,Zaihang Zheng,Yan Liu
{"title":"Biomimetic Construction of Robust and Multifunctional-Integrated Superhydrophobic Coatings on Steel Structures via a One-Step Spraying Technique.","authors":"Haidi Li,Meihuan Gao,Zhenlin Tang,Mengru Zhang,Ying Song,Xinqiang Wu,Zaihang Zheng,Yan Liu","doi":"10.1021/acs.langmuir.5c00077","DOIUrl":"https://doi.org/10.1021/acs.langmuir.5c00077","url":null,"abstract":"Nowadays, the contradictions between ideal fire resistance and adequate surface functionality are increasingly highlighted for conventional coatings of steel structures in actual applications. In this context, the introduction of multifunctional coatings has become one of the effective and practical avenues to solve the crucial problem of steel materials. In this paper, superhydrophobic coatings inspired by nature were successfully prepared on steel structures by a simple one-step spraying method, which consisted of a mixture of silicone resin (SR), poly(dimethylsiloxane) (PDMS), diatomaceous earth (DE), titanium dioxide (TiO2), and modified ammonium polyphosphate (MAPP). The results showed that a static water contact angle (WCA) of 157.5° and a water sliding angle (WSA) of 5° were achieved by the as-prepared coatings with good water repellency and self-cleaning ability. Most importantly, the minimum backside temperature of the coated steel structures was decreased to 287 °C during the fire impact tests. Compared with neat EP/PDMS, the peak-to-heat release rate (PHRR) and total heat release rate (THR) were significantly reduced to 26.7 and 26.1%, respectively, indicating that the as-prepared coatings possessed excellent passive fire-resistant capacity. The synergistic effect of fillers in the condensed phase occupied a dominant position in promoting high-quality char layers. Surprisingly, coatings with good robustness could be further endowed with adequate corrosion resistance and oil/water separation ability. Therefore, this work provided a viable and effective strategy for tackling the surface functionality problem of materials, which could extend the application scope of superhydrophobic coatings in more fields.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"131 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144103706","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
Hydrothermal Fabricated Ni3S4-Yb2O3 Heterojunction Electrocatalysts with Charge Redistribution for Efficient Alkaline Oxygen Evolution Reactions. 水热法制备Ni3S4-Yb2O3异质结高效碱性析氧反应电催化剂
IF 3.9 2区 化学
Langmuir Pub Date : 2025-05-21 DOI: 10.1021/acs.langmuir.5c01471
Lijia She,Nan Li,Yi Wu,Xi Xi,Yafei Liu,Peng Shen,Gang Zhao,Jiangquan Ma
{"title":"Hydrothermal Fabricated Ni3S4-Yb2O3 Heterojunction Electrocatalysts with Charge Redistribution for Efficient Alkaline Oxygen Evolution Reactions.","authors":"Lijia She,Nan Li,Yi Wu,Xi Xi,Yafei Liu,Peng Shen,Gang Zhao,Jiangquan Ma","doi":"10.1021/acs.langmuir.5c01471","DOIUrl":"https://doi.org/10.1021/acs.langmuir.5c01471","url":null,"abstract":"Designing efficient and stable oxygen evolution reaction (OER) catalysts is of great significance for hydrogen production technology through the electrolysis of water. Nickel sulfide (NixSy) has garnered considerable attention as an OER electrocatalyst owing to its high electrical conductivity and distinctive structure. Herein, Ni3S4-Yb2O3 on nickel foam electrocatalysts was fabricated through a hydrothermal synthesis approach to optimize the performance of Ni3S4. The incorporation of Yb2O3 induced charge redistribution within Ni3S4, expanded the active surface area, and enhanced the availability of active sites. Consequently, the Ni3S4-Yb2O3/NF catalyst demonstrates exceptional electrocatalytic performance in 1 M KOH, attaining a current density of 10 mA cm-2 at a minimal overpotential of 148 mV, along with an ultralow Tafel slope of 47.3 mV dec-1. In addition, we have confirmed that another reason for the improved performance is that Yb2O3, as an electron donor, can effectively regulate the defects of the Ni atoms. This work offers a feasible strategy for developing highly effective OER electrocatalysts in alkaline media.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"18 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144103707","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
Role of Peptide Molecular Conformation in Improving the Gene Delivery Efficiency of Liposomal Formulations 肽分子构象在提高脂质体基因传递效率中的作用
IF 3.9 2区 化学
Langmuir Pub Date : 2025-05-21 DOI: 10.1021/acs.langmuir.5c00351
Yaohui Du, Chuanmei Tang, Bowen Li, Lei Yue, Rongxin Su, Wei Qi, Xianbao Cui, Yuefei Wang
{"title":"Role of Peptide Molecular Conformation in Improving the Gene Delivery Efficiency of Liposomal Formulations","authors":"Yaohui Du, Chuanmei Tang, Bowen Li, Lei Yue, Rongxin Su, Wei Qi, Xianbao Cui, Yuefei Wang","doi":"10.1021/acs.langmuir.5c00351","DOIUrl":"https://doi.org/10.1021/acs.langmuir.5c00351","url":null,"abstract":"The study explored the impact of peptide conformations on the efficiency of nucleic acids transfection by designing two sets of linear (liKK and liRR) and cyclic peptides (cyKK and cyRR) with various sequences (KK: KKKKCRGDSCKKKK and RR: RRRRCLLLLCRRRR). Incorporating peptides in the liposome formulation improved gene transfection efficiency compared to the peptide and 1,2-dioleoyl-3-trimethylammonium-propane (DOTAP)/1,2-dioleoyl-<i>sn</i>-glycero-3-phosphoethanolamine (DOPE) alone. The results revealed that adding linear peptides demonstrated a higher delivery efficiency in comparison to cyclic peptides in transfection formulations. Additionally, two effective groups of transfection formulations were established. The liKK/DOTAP/DOPE formulation proved exceptional at delivering mRNA, achieving a transfection efficiency of 93.3%, comparable to that of Lipofectamine 2000 (91.7%). In contrast, the liRR/DOTAP/DOPE formulation effectively delivered both pDNA and siRNA. The pDNA transfection efficiency reached 42.3%, closely matching Lipofectamine 2000 (43.9%), while the siRNA transfection efficiency hit 90.7%, surpassing Lipofectamine 2000’s performance (85.4%). The transfection efficiency of linear conformational formulations is superior to that of cyclic ones. Our research provides new options for liposome formulations and offers valuable insights for designing peptide-based gene delivery vectors with different conformations.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"14 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144104444","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
Sustainable Electrochemical Synthesis of Porous g-C3N4 Nanosheets via 3D-Printed Platinized Electrodes for Enhanced Photocatalytic Activity 利用3d打印镀铂电极可持续电化学合成多孔g-C3N4纳米片以增强光催化活性
IF 3.9 2区 化学
Langmuir Pub Date : 2025-05-21 DOI: 10.1021/acs.langmuir.5c01475
Shubham Kumar Patial, Daya Rani, Mayank Garg, Vijay Kumar Meena, Mansi Pahuja, Kaushik Ghosh, Suman Singh
{"title":"Sustainable Electrochemical Synthesis of Porous g-C3N4 Nanosheets via 3D-Printed Platinized Electrodes for Enhanced Photocatalytic Activity","authors":"Shubham Kumar Patial, Daya Rani, Mayank Garg, Vijay Kumar Meena, Mansi Pahuja, Kaushik Ghosh, Suman Singh","doi":"10.1021/acs.langmuir.5c01475","DOIUrl":"https://doi.org/10.1021/acs.langmuir.5c01475","url":null,"abstract":"Graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>), a polymeric metal-free catalyst, is extensively used to degrade industrial toxic waste that contaminates the aqueous system. However, commonly synthesized bulk g-C<sub>3</sub>N<sub>4</sub> is prone to agglomeration, leading to low surface area with fewer effective photoactive centers, limiting its potential toward the facile separation of photo-excitons and resulting in low photocatalytic activity. This study introduces an innovative electrochemical synthesis of in situ exfoliated porous g-C<sub>3</sub>N<sub>4</sub> nanosheets (GCN NSs) featuring a large surface area with effective separation of photo-excitons, leading to the facile production of reactive oxygen species (ROS). The GCN NSs are uniformly dispersed in an alkaline solution grown via a newly designed electrochemical process using 3D-printed platinumized titanium mesh as both anode and cathode under rigorous stirring for 40 min. The morphological study, along with surface area determination, reveals that the as-grown carbonaceous matrix is highly exfoliated with an inherent nanoporous architecture, having a high surface area of 163.73 m<sup>2</sup> g<sup>–1</sup> with an average pore diameter of 8.311 nm. The electrochemically synthesized GCN NSs demonstrate excellent charge transfer kinetics with low charge transfer resistance and superior photocatalytic activity of 98% degradation efficiency against various organic dyes (concentration of 10 ppm) under simulated solar irradiation for 120 min with 5 mg of catalyst. Kinetic studies of the photodegradation process indicate that the reaction follows pseudo-first-order kinetics, with the rate constant of 3.59 × 10<sup>–2</sup> min<sup>–1</sup>, which is approximately 1.8 times higher as compared to the recent findings. A plausible mechanistic understanding reveals that photogenerated holes and hydroxyl radicals (<sup>•</sup>OH) are the primary species for the overall photodegradation process. The stability test depicts that the photocatalyst maintains its efficiency over five consecutive runs with a minimum loss of 7%. This research offers valuable insights into the design and synthesis of advanced photocatalysts with optimized architectures for enhanced industrial waste management.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"136 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144114401","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
Bridging Gaps in the Synthesis of g-CN/WO3-x for Photocatalytic H2O2 Generation: Insights into S-Scheme Heterojunction and Plasmon-Induced Hot Electrons. 光催化生成H2O2的g-CN/WO3-x合成中的弥合间隙:对S-Scheme异质结和等离子体诱导热电子的见解。
IF 3.9 2区 化学
Langmuir Pub Date : 2025-05-21 DOI: 10.1021/acs.langmuir.5c01154
Aleyna Basak,Melek Sermin Ozer,Zafer Eroglu,Kang Sun,Onder Metin
{"title":"Bridging Gaps in the Synthesis of g-CN/WO3-x for Photocatalytic H2O2 Generation: Insights into S-Scheme Heterojunction and Plasmon-Induced Hot Electrons.","authors":"Aleyna Basak,Melek Sermin Ozer,Zafer Eroglu,Kang Sun,Onder Metin","doi":"10.1021/acs.langmuir.5c01154","DOIUrl":"https://doi.org/10.1021/acs.langmuir.5c01154","url":null,"abstract":"This study presents a systematic design for fabricating g-CN/WO3-x S-scheme heterojunctions with plasmonic features (localized surface plasmon resonance (LSPR) and hot electrons) to achieve superb photocatalytic H2O2 production activity. To optimize the synthesis, a rational approach is employed to how synthesis parameters influence the emergence of LSPR and hot electrons in WO3-x and their effect on the heterojunction's performance. As a result of such a comprehensive strategy, the developed synthesis methodology effectively bridges gaps in the literature, addressing underexplored strategies for improving photocatalytic efficiency for the controlled synthesis of the g-CN/WO3-x heterojunction. The plasmonic characteristics attributed to oxygen deficiency in WO3 (WO3-x) and g-CN/WO3-x and interactions of g-CN and WO3-x at the atomic level are further corroborated through a comprehensive analysis employing X-ray photoelectron spectroscopy (XPS), solid-state nuclear magnetic resonance (ssNMR), and electron paramagnetic resonance (EPR). Thanks to the presence of WO3-x, the light-harvesting ability of g-CN/WO3-x heterojunctions spans from the visible to near-infrared region. Moreover, the generation of hot electrons on the surface of WO3-x mitigates electron-hole recombination in the binary heterojunction. Consequently, the g-CN/WO3-x S-scheme heterojunctions synthesized with the optimal recipe provided a superior photocatalytic H2O2 generation rate of 1349.70 μmol·L-1 in 10% (v/v) aqueous methanol solution within 90 min, which is 2.36 and 7.17 times greater than that of pristine g-CN and WO3-x, respectively, superior to other similar photocatalysts tested in photocatalytic H2O2 production. The superb photocatalytic activity of the g-CN/WO3-x heterojunction is attributed to the synergistic effects aroused in the S-scheme heterojunction, promoting efficient charge separation with enhanced redox potentials and plasmon-induced hot electrons that both accelerate reactions through the photothermal effect and serve as additional reducing species. This research broadens the perspective toward constructing nonmetallic plasmonic S-scheme heterojunctions for fields utilizing LSPR phenomena, such as photocatalysis, photonics, and biomedicine.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"135 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144103713","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
Superhydrophobic Aluminum Surfaces Modified with Hierarchically Structured Oleates-Intercalated LDH Arrays for Anticorrosion: Structure, Anticorrosion Enhancement, and Mechanism. 用层次化油酸嵌入LDH阵列修饰超疏水铝表面的防腐:结构、防腐增强和机理。
IF 3.9 2区 化学
Langmuir Pub Date : 2025-05-21 DOI: 10.1021/acs.langmuir.5c00418
Xin Guo,Zhe An,Jing He
{"title":"Superhydrophobic Aluminum Surfaces Modified with Hierarchically Structured Oleates-Intercalated LDH Arrays for Anticorrosion: Structure, Anticorrosion Enhancement, and Mechanism.","authors":"Xin Guo,Zhe An,Jing He","doi":"10.1021/acs.langmuir.5c00418","DOIUrl":"https://doi.org/10.1021/acs.langmuir.5c00418","url":null,"abstract":"The potential applications of superhydrophobic materials in marine environments, particularly in terms of corrosion resistance and antibiofouling, have captured the intense interest of researchers and engineers. Herein, superhydrophobic aluminum surfaces modified with hierarchical structured oleate anions intercalated layered double hydroxide arrays (MgAl-OA--LDHs@AS) were fabricated by a one-step hydrothermal method, and detailed structural manipulation was carried out. Comprehensive structural characterizations were conducted, including analyses of morphology, composition, roughness, and wettability. The obtained superhydrophobic surfaces were found to be uniform, compact, and stable. By modulating the surface roughness, the superhydrophobicity was significantly improved, achieving a water contact angle of 154.0° and a roll-off angle of 4.2°. The anticorrosion effect was investigated by monitoring changes in electrochemical potentiodynamic polarization and impedance spectroscopy measurements. MgAl-OA--LDHs@AS demonstrated corrosion resistance with a relatively low corrosion current density (Icorr) of 2.0 × 10-10 A·cm-2. MgAl-OA--LDHs@AS effectively resisted electrochemical corrosion and provided excellent long-term corrosion protection for at least 30 days. The anticorrosion mechanism was proposed, revealing the excellent performance of the anticorrosion membrane.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"40 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144103710","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-Assembled Sodium Dodecyl Sulfate Structures on Mineral Surfaces Following Rapid Solvent Removal. 快速溶剂去除后矿物表面的自组装十二烷基硫酸钠结构。
IF 3.9 2区 化学
Langmuir Pub Date : 2025-05-20 DOI: 10.1021/acs.langmuir.5c00640
Mariana C Prado,Bernardo R A Neves
{"title":"Self-Assembled Sodium Dodecyl Sulfate Structures on Mineral Surfaces Following Rapid Solvent Removal.","authors":"Mariana C Prado,Bernardo R A Neves","doi":"10.1021/acs.langmuir.5c00640","DOIUrl":"https://doi.org/10.1021/acs.langmuir.5c00640","url":null,"abstract":"Sodium dodecyl sulfate (SDS) is a widely used surfactant with applications ranging from detergents to cell lysis and nanomaterial exfoliation. Additionally, SDS can form self-assembled structures on different substrates under specific conditions. While extensive research has explored SDS self-assembly at the liquid-solid interface, less is known about the structures formed at the solid-air interface following solvent removal. In this study, we investigated SDS self-assembled structures on HOPG (highly oriented pyrolytic graphite), talc, and mica substrates using spin-coating and spread-coating methods. Scanning probe microscopy revealed a range of morphologies, including hemicylindrical micelles, lamellar bilayers, and quasi-1D structures, shaped by the interaction between SDS and the substrate surface. On HOPG, hemicylindrical micelles were observed in dilute solutions, whereas lamellar 2D structures, likely bilayer stacks, formed in both dilute and concentrated samples. On talc, lamellar bilayers demonstrated temporal evolution and thermal stability up to 160 °C. Mica samples exhibited quasi-1D structures, 2D bilayers, and thinner lamellar 2D structures, with evidence suggesting the presence of a methyl-terminated monolayer. Thermal annealing tests indicated that quasi-1D structures lost organization at 60 °C, whereas bilayers remained stable up to 150 °C, at least. The results highlight the complexity of SDS self-assembly at the solid-air interface, emphasizing the critical role of local environmental factors. These findings provide insights into surfactant behavior during solvent removal and establish a foundation for further exploration of self-assembled systems under ambient conditions.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"76 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144103538","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 Non-Isothermal General Rate Model of Liquid Chromatography Considering Bi-Langmuir Adsorption and Temperature Variations. 考虑Bi-Langmuir吸附和温度变化的非等温液相色谱一般速率模型。
IF 3.9 2区 化学
Langmuir Pub Date : 2025-05-20 DOI: 10.1021/acs.langmuir.5c00544
Amir Shehzad,Sadia Perveen,Shamsul Qamar
{"title":"A Non-Isothermal General Rate Model of Liquid Chromatography Considering Bi-Langmuir Adsorption and Temperature Variations.","authors":"Amir Shehzad,Sadia Perveen,Shamsul Qamar","doi":"10.1021/acs.langmuir.5c00544","DOIUrl":"https://doi.org/10.1021/acs.langmuir.5c00544","url":null,"abstract":"In preparative chromatography, the adsorption of substances onto solid surfaces is influenced by temperature variations, leading to changes in the migration velocities of solutes within the chromatographic column. This research provides a detailed analysis of thermal fluctuations in porous media with dual adsorption sites, utilizing a non-isothermal General Rate Model (GRM) specifically tailored to the bi-Langmuir adsorption isotherm. Solute transport within heterogeneous porous media is governed by a system of nonlinear partial differential equations, characterized by convective flow dominance. This system is further coupled with a nonlinear algebraic equation describing the bi-Langmuir adsorption isotherm. To effectively address the challenges posed by this system, it is essential to develop robust and accurate numerical techniques capable of reliable simulations. This study extends and applies a second-order, semidiscrete, high-resolution finite volume method to simulate the governing equations. Numerical experiments, involving multicomponent mixture flows, are conducted to theoretically evaluate the influence of intraparticle diffusion, film mass transfer resistance, axial dispersion, enthalpy of adsorption, adsorption energy coefficients, and Henry constants on the velocity of simulated elution profiles.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"79 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144103763","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
Anisotropic Anti-Swelling Hydrogels with Hydrophobic Association and Metal-Ligand Cross-Links for Applications in Underwater Strain Sensing and Anisotropic Actuation. 具有疏水缔合和金属配体交联的各向异性抗膨胀水凝胶在水下应变传感和各向异性驱动中的应用。
IF 3.9 2区 化学
Langmuir Pub Date : 2025-05-20 DOI: 10.1021/acs.langmuir.5c01032
Prachishree Panda,Pintu Maity,Agniva Dutta,Rajat Kumar Das
{"title":"Anisotropic Anti-Swelling Hydrogels with Hydrophobic Association and Metal-Ligand Cross-Links for Applications in Underwater Strain Sensing and Anisotropic Actuation.","authors":"Prachishree Panda,Pintu Maity,Agniva Dutta,Rajat Kumar Das","doi":"10.1021/acs.langmuir.5c01032","DOIUrl":"https://doi.org/10.1021/acs.langmuir.5c01032","url":null,"abstract":"We report herein a strategy to design mechanically strong and anisotropic metal ion cross-linked conducting hydrogel materials and their possible application in anisotropic resistive strain sensing. A dynamic hydrophobic association was incorporated in a chemically cross-linked poly(acrylamide-co-methacrylic acid) hydrogel by incorporating a hydrophobic comonomer appended with a terpyridine ligand. After prestretching this hydrogel, Fe3+ ion-ligand cross-linking was established with carboxylic group of methacrylic acid and the terpyridine unit of the hydrophobic comonomer to lock the alignment of the polymer chains, which significantly enhanced the mechanical performance of the hydrogel. The anisotropic hydrogels achieved high mechanical strength of 1.6-2.7 MPa, breaking strain of 250-320%, toughness of 3-4 MJ m-3, and elastic modulus of 1.7-2.5 MPa under optimized experimental condition. Significantly inferior mechanical performance was observed when the load was applied in the direction perpendicular to prestretching direction. High fracture energy of 0.99 ± 0.4 kJ m-2 -similar to that of (∼1000 J m-2) the biological load bearing tissue cartilage-could be achieved when the crack was introduced perpendicular to prestretch direction. The anisotropic alignment of the polymer chains in the hydrogel was confirmed by FESEM and SAXS experiments. The Fe3+ ions as well as the hydrophobe concentration played a vital role in altering the mechanical properties of these hydrogels. The presence of hydrophobic association contributes to enhancing the mechanical anisotropy of the hydrogels, whereas the methacrylic acid-Fe3+ cross-links contributed to enhancing the tensile strength and stiffness of these anisotropic hydrogels. The hydrogel materials demonstrated anisotropic resistive strain sensing and anisotropic actuation behavior. These anisotropic swelling-resistant hydrogels also showed capability for stable and repetitive underwater strain sensing, which may have potential applications in underwater human motion sensing and soft robotics application.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"135 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144103767","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
Frontiers in Single-Molecule Junction Detection: A Review of Recent Innovations and Breakthroughs. 单分子结检测前沿:近期创新与突破综述
IF 3.9 2区 化学
Langmuir Pub Date : 2025-05-20 DOI: 10.1021/acs.langmuir.5c00270
Dingling Zhuang,Dongdong Wang,Jizhe Xu,Ziyun Tang,Juan Joon Ching,Tau Chuan Ling,Xiaohui Li,Wenjing Hong
{"title":"Frontiers in Single-Molecule Junction Detection: A Review of Recent Innovations and Breakthroughs.","authors":"Dingling Zhuang,Dongdong Wang,Jizhe Xu,Ziyun Tang,Juan Joon Ching,Tau Chuan Ling,Xiaohui Li,Wenjing Hong","doi":"10.1021/acs.langmuir.5c00270","DOIUrl":"https://doi.org/10.1021/acs.langmuir.5c00270","url":null,"abstract":"Single-molecule junction techniques offer powerful tools for studying physical and chemical properties at the single-molecule level, while enabling groundbreaking advances in ultrasensitive sensing. This review encapsulates the latest progress made in tracking chemical reactions and intermolecular interactions by employing single-molecule junction techniques. Additionally, we explore their practical applications in detection and sensing of trace chemical substances and biomolecules. Single-molecule electrical measurements, such as mechanically controllable break junctions (MCBJs), scanning tunneling microscopy break junctions (STM-BJs), and graphene-molecule-graphene single-molecule junctions (GMG-SMJ), exhibit exceptional sensitivity and resolution. These techniques allow for precise control and detection at the molecular scale, providing powerful tools for research across disciplines such as chemistry, biology, and physics while also driving new discoveries and advancements in related fields. Furthermore, we highlight the applications of single-molecule junction-based sensing techniques in identifying small molecules and ions in various media, thus contributing noteworthy insights into the design of ultrasensitive single-molecule sensors.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"21 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144103768","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
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