Langmuir最新文献

{"title":"Lubrication Behavior of Fullerene-Coated Nanoparticles on Rough Surfaces.","authors":"Guangchao Han,Zifu Shen,Zhezhe Jia,Ruilin Yan,Hailong Wang","doi":"10.1021/acs.langmuir.5c03191","DOIUrl":"https://doi.org/10.1021/acs.langmuir.5c03191","url":null,"abstract":"Nanoparticles exhibit excellent lubrication properties and are utilized on rough interfaces to mitigate friction. This study investigates the lubrication behavior of composite C540 fullerene-coated silicon nanoparticles on rough silicon surfaces through all-atom molecular dynamics simulations (LAMMPS). The effects of key factors, including applied load, nanoparticle quantity, sliding velocity, and surface roughness, are systematically analyzed. Our results show that under high applied loads, increasing nanoparticle quantity effectively alleviates stress concentration, reducing both structural deformation and friction. However, excessive quantities cause pronounced protrusions that increase structural deformation. Velocity changes do not significantly impact friction or structural deformation, as the motion patterns of the probe and nanoparticles remain consistent. However, under low applied loads, probe-driven nanoparticle motion becomes the dominant factor in frictional energy dissipation. A positive correlation between the total kinetic energy of nanoparticles and friction force is observed across different roughness surfaces. The negative effects of excessive nanoparticles become more pronounced with increasing surface roughness. The optimal nanoparticle quantity is determined to be the minimum required to prevent stress-concentration-induced structural deformation. The optimal nanoparticle concentration reaches approximately 88.8% under high-load conditions, with each 3.55% increase in concentration resulting in a 0.45% reduction in structural deformation and a 0.59 nN decrease in friction. Under low-load conditions, the optimal concentration ranges from 15% to 30% across varying surface roughness levels, reducing friction by 30%-55% compared to the peak kinetic energy conditions. At low sliding velocities, nanoparticles fully adapt to substrate grooves, ensuring the probe and nanoparticles follow nearly identical interaction patterns at different velocities, making friction independent of sliding velocity. However, at high velocities, the nanoparticles act as abrasive particles, causing significant increases in both structural deformation and friction. On flat surfaces, friction is proportional to the applied load and remains independent of nanoparticle quantity. This study provides atomic-level insights into nanoparticle lubrication on rough surfaces, elucidating how nanoparticle concentration governs lubrication performance under varying conditions.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"91 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145194508","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":"A Stably Water-Dispersible Cyano-Containing Fully Conjugated Covalent Organic Framework for the Fluorescence Detection of Copper Ions in Aqueous Solution.","authors":"Sijing He, Zhiling Huang, Dongping Li, Junxia Qin, Qinfeng Rong","doi":"10.1021/acs.langmuir.5c03813","DOIUrl":"https://doi.org/10.1021/acs.langmuir.5c03813","url":null,"abstract":"<p><p>Excessive and insufficient copper ions in the environmental water bodies will cause various physiological diseases, and thus, the quantitative detection of Cu²⁺ in water is of vital importance for human health. Covalent organic frameworks (COFs) have shown promising prospects for effective Cu²⁺ detection due to their robust chemical stability, structural flexibility, and tailorable functionality. However, the majority of COFs, constructed by aryl monomers through π-conjugated frameworks, exhibit high hydrophobicity, which limits their applications in aqueous environments. Here, we address this issue by introducing cyano groups into the skeleton to enhance its hydrophilicity for the synthesis of a fully conjugated COF (TFPT-PDAN) that is capable of dispersing well and stably in water. The resultant TFPT-PDAN aqueous dispersion exhibits a strong and stable fluorescence, and the addition of Cu²⁺ could cause its fluorescence quenching, which is attributed to the photoinduced electron transfer (PET) process between Cu²⁺ as the acceptor and TFPT-PDAN as the donor. As expected, TFPT-PDAN exhibits favorable specificity and high sensitivity for detecting Cu²⁺. This work depicts the possibility of overcoming the dispersion challenge of COFs in water, expanding their sensing applications in aqueous media.</p>","PeriodicalId":50,"journal":{"name":"Langmuir","volume":" ","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145205166","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":"Single-Cell Mapping of Colloidal Phase Transitions via Dielectrophoretic Control of Particle Concentration.","authors":"Namhee Kang, Yeonseo Joo, Hyerim Hwang","doi":"10.1021/acs.langmuir.5c03803","DOIUrl":"https://doi.org/10.1021/acs.langmuir.5c03803","url":null,"abstract":"<p><p>Colloidal systems offer a versatile platform for probing condensed matter behavior through tunable interactions and direct imaging. While dielectrophoresis (DEP) has previously been used to crystallize colloids, its broader potential for systematically resolving multiple phase transitions within a single system remains underexplored. Here, we build on prior DEP-based approaches by demonstrating a unified single-sample platform that enables continuous, reversible modulation of local volume fraction and interparticle potential via electric field gradients and surfactant-controlled ionic strength. This platform accesses a range of phase states including liquid-BCC, BCC-FCC, and melting, within a sealed sample. Using real-time confocal microscopy and quantitative structural analysis, we track the evolution of order and capture reversible transitions. Our results highlight the ability to controllably switch between distinct crystal symmetries and phase boundaries in situ, offering a powerful tool for studying nonequilibrium transitions and interface dynamics.</p>","PeriodicalId":50,"journal":{"name":"Langmuir","volume":" ","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145205169","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":"Enhanced Electrochemical Detection for DNA Hybridization on Core-Shell Magnetic Silica Sphere Gold Nanoparticles.","authors":"Sanyukta Mayuri,Niki S Jha,Shailendra Kumar Jha,Padma Sharma","doi":"10.1021/acs.langmuir.5c01401","DOIUrl":"https://doi.org/10.1021/acs.langmuir.5c01401","url":null,"abstract":"In this work, we have reported a new electrochemical approach for detection of DNA hybridization-based core-shell magnetic silica sphere gold nanoparticles (MSS@AuNPs) coated on a gold electrode. The as-synthesized nanoparticles were synthesized in a three-step process and characterized by using ultraviolet-visible spectra, FTIR spectra, Raman spectra, a vibrating sample magnetometer, and X-ray diffraction techniques, respectively. Our results demonstrate that 51 nm MSS@AuNPs with 12 nm thickness of silica and 10 nm thickness of gold layer possess outstanding electron transport capabilities on gold electrodes, enabling the highly sensitive detection of complementary DNA targets at a remarkable limit of 0.47 ± 0.20 pM using differential pulse voltammetry (DPV). Furthermore, the amperometric detection sensitivity reached 0.27 ± 0.10 pM, highlighting the impressive performance of this biosensor. It can effectively differentiate between perfectly matched sequences (CT), mismatched sequences (MT), deleted sequences (DT), and noncomplementary targets (NT) with exceptional precision. The proposed sensor shows high robustness, reproducibility, and stability reinforcing its potential for future applications. This research not only advances the development of sophisticated diagnostic tools but also opens new pathways for innovative treatments in biomedical research.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"75 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145194560","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":"Bioinspired Dual-Mode Self-Powered Paper Sensor for Sustainable Wearable Health Monitoring via Synergistic Humidity Gradient and Triboelectric Effects.","authors":"Aoxun Liang,Weijie Liu,Meihong Yao,Bao Song,Xueye Chen,Juan Wei,Jingjing Duan","doi":"10.1021/acs.langmuir.5c03896","DOIUrl":"https://doi.org/10.1021/acs.langmuir.5c03896","url":null,"abstract":"Wearable sensors are becoming increasingly important in human health detection. However, existing sensors face severe challenges in achieving self-sustained multimodal sensing and environmentally friendly and low-cost manufacturing. Here, we report a dual self-powered paper-based humidity-difference/triboelectric sensor. This sensor integrates humidity and triboelectric self-powered detection functions through the synergistic effect of the ion gradient effect and triboelectric contact electrification. A carbon nanotube composite salt solution is used to modify the fibrous paper substrate, and bionic graphite fingerprint electrodes are drawn with a pencil on the cellulose paper. Relying on the noncontact humidity detection driven by the ion gradient inside the paper, a humidity open-circuit voltage is generated, and the humidity detection range is 11%-90% RH with a high linearity of R2 = 0.97. At the same time, a friction self-powered triboelectric sensing device is prepared with paper as the substrate. Through the principle of charge difference and contact mode, a triboelectric sensor is integrated, enabling triboelectric and humidity dual-mode sensing without an external power source. This work provides a sustainable and low-cost strategy for constructing paper-based self-powered dual-mode sensors. Moreover, we apply the prepared sensors to various human body detections and tests in other application environments.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"1 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145194561","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":"pH-Responsive Morphological Transitions of Azobenzene-Phospholipid Vesicles.","authors":"Sunnam Kim,Shintaro Sato,Naoki Hasegawa,Tsuyoshi Fukaminato,Seiji Kurihara","doi":"10.1021/acs.langmuir.5c03795","DOIUrl":"https://doi.org/10.1021/acs.langmuir.5c03795","url":null,"abstract":"pH-responsive vesicles are promising candidates for passive cancer targeting. These vesicles were constructed from two push-pull azobenzene-containing phospholipids with different substituents, one of which incorporates a pH-sensitive piperazine linker. The amphiphilic molecules self-assemble into spherical bilayer vesicles via π-π stacking, with their morphologies governed by the orientational order of the azobenzene moieties. Mixing the two components facilitates spherical vesicle formation by introducing orientational defects that promote curvature. Under mildly acidic conditions (pH ∼6), protonation of the piperazine group enhances the hydrophilicity of the responsive component, leading to its depletion from the membrane and a consequent shift in composition. This compositional change induces a morphological transition toward a planar bilayer, thermodynamically stabilized by the increased orientational order of the remaining azobenzene units. Such a distinct shape change in response to slight pH variation highlights the potential of these vesicles as smart drug delivery carriers.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"26 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145194559","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":"Location of the Diclofenac Molecule in Model Lipid Membranes from Spin-Label-Enhanced NMR Relaxation.","authors":"Anastasia N Atnyukova,Anna S Kashnik,Olga Yu Selyutina,Denis S Baranov,Nikolay E Polyakov,Sergei A Dzuba","doi":"10.1021/acs.langmuir.5c03328","DOIUrl":"https://doi.org/10.1021/acs.langmuir.5c03328","url":null,"abstract":"Nonsteroidal anti-inflammatory drugs (NSAIDs) can be used to treat a variety of conditions due to their antipyretic, anti-inflammatory, and analgesic effects. Their interaction with lipid membranes can cause various side effects known for these drugs. In this study, we employ 1H 500 MHz liquid-state NMR to study the spin-lattice relaxation rate, T1-1, in model lipid membranes with embedded spin-labeled diclofenac (diclofenac-SL) as a relaxation enhancer. The membranes were unilamellar liposomes of four types: consisting of unsaturated 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC), a POPC/cholesterol mixture (80:20 mol %), fully saturated 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC), and a DMPC/cholesterol mixture (80:20 mol %). The obtained data for protons in different positions in the lipid molecule showed that, in the absence of cholesterol, diclofenac-SL in the POPC membrane is distributed approximately uniformly throughout the entire depth of the membrane, while in the DMPC membrane there is some shift for the hydrophobic interior. In the presence of cholesterol, a slight shift of diclofenac-SL toward the membrane surface is observed for POPC/cholesterol liposomes, whereas a tendency toward displacement away from the membrane surface is observed in DMPC/cholesterol liposomes.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"18 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145194821","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":"Millimeter-Scale Hydrophilic/Hydrophobic Striped Surfaces for Air Layer Retention and Drag Reduction in Diving Suits.","authors":"Xiaoqing Sun,Yijie Miao,Guo Lu,Xiusong Hou,Yanhao Chen","doi":"10.1021/acs.langmuir.5c03814","DOIUrl":"https://doi.org/10.1021/acs.langmuir.5c03814","url":null,"abstract":"Traditional fully hydrophobic diving suits have limitations in reducing drag and improving speed, primarily due to the formation of an unstable air layer. To address this issue, we propose a millimeter-scale hydrophilic/hydrophobic striped surface design aimed at maintaining a stable air layer and achieving significant drag reduction. By strategically arranging alternating hydrophilic/hydrophobic regions in the critical areas of the diving suit, we first validated the feasibility of this method through preliminary simulations using the CFX simulation software. Subsequently, we demonstrated through comparative experiments that this composite surface maintains an air layer more effectively than do uniformly hydrophilic or hydrophobic surfaces under hydrodynamic conditions. Finally, a mechanistic model was established to elucidate the mechanism behind the maintenance of the air layer on the composite surface and to derive the critical flow velocity required for the formation of the air layer. The results indicate that the hydrophilic/hydrophobic stripe design extends the air layer retention time, providing a foundational framework for optimizing surfaces in underwater applications and offering new insights into designing high-performance diving suits.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"91 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145189421","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":"From Layered Double Hydroxide Synthesis in Deep Eutectic Solvents to Nanocomposites of Layered Double Hydroxides-Deep Eutectic Solvents.","authors":"Zinar Pinar Gumus,Mustafa Soylak","doi":"10.1021/acs.langmuir.5c01996","DOIUrl":"https://doi.org/10.1021/acs.langmuir.5c01996","url":null,"abstract":"The use of deep eutectic solvents (DES) has emerged as an important topic in numerous research areas due to their environmentally friendly, sustainable, and high-performance properties. The environmentally friendly properties, high solubility capabilities, and low melting temperatures of DESs make them suitable for a wide range of applications. Layered double hydroxides (LDHs), a family of anionic clays with three-dimensional networks, have attracted interdisciplinary attention as a class of inorganic layered materials due to their unique physicochemical properties. In addition to studies using DES in LDH synthesis, a limited number of studies on LDH-DES composites have been included to investigate the potential for the production of environmentally friendly and sustainable materials in the future.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"5 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145194566","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":"Self-Templating Synthesis of Mn-Doped MoS2 Nanosheets Grown on Tubular N-Doped Carbon with Enhanced Peroxidase-Like Performance.","authors":"Xiaohong Xu,Jingli Xu,Na Lu,Min Zhang","doi":"10.1021/acs.langmuir.5c03898","DOIUrl":"https://doi.org/10.1021/acs.langmuir.5c03898","url":null,"abstract":"Exploring sustainable and highly active catalysts for enzyme-like catalysis is vital for the development and application of nanozymes. Herein, we prepared Mn-doped MoS2 nanosheet (NSs)-supported hollow mesoporous carbon nanotubes (CNTs) through a one-pot hydrothermal reaction and a subsequent annealing treatment under nitrogen atmosphere. Using (NH4)2MoO4 and thiourea as the precursor of MoS2, MnO2 nanowires (NWs) provided the Mn source for doping MoS2 and as the initiator to promote the pyrrole polymerization to form a one-dimensional (1D) polypyrrole (PPy) shell. During sulfidation, released H+ cations diffused through PPy pores into the MnO2 NWs core, causing their dissolution. As a result, hierarchical 1D hierarchical PPy@Mn-MoS2 was successfully formed. After thermal treatment, the obtained nitrogen-doped CNTs@Mn-MoS2 exhibited excellent peroxidase-like activity and stability owing to the unique tubular structure and Mn-doped MoS2 NSs. This involves a self-sacrificial template and transition-metal doping; this strategy provides a method to precisely regulate the intrinsic catalytic activity and construct the tubular structure toward enzyme-like catalysis and other energy-related processes.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"71 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145194801","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}