Langmuir最新文献_第2页

Multiscale Investigation of Liquid Imbibition on an Electrodeposited Rough Surface 电沉积粗糙表面液体浸润的多尺度研究

IF 3.9 2区化学

Langmuir Pub Date : 2024-11-21 DOI: 10.1021/acs.langmuir.4c03012

Itishree Panda, Samyabrata Chatterjee, Monojit Chakraborty, Sunando DasGupta

{"title":"Multiscale Investigation of Liquid Imbibition on an Electrodeposited Rough Surface","authors":"Itishree Panda, Samyabrata Chatterjee, Monojit Chakraborty, Sunando DasGupta","doi":"10.1021/acs.langmuir.4c03012","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c03012","url":null,"abstract":"Hydrophilic and superhydrophilic surfaces are often used in various applications, such as biomedical surface modification, heat pipe design, lab-on-chip devices, microelectronic structure design, etc. Deposition of molecules on surfaces and chemical modification of the surface are two of the frequently adopted techniques to fabricate hydrophilic surfaces. However, achieving controlled and precise surface roughness is an expensive process, and the multiscale nature of liquid imbibition on rough surfaces complicates the system’s physics. To address this challenge, we propose an alternative approach for creating controlled rough surfaces by electrodeposition of copper ions on copper electrodes, explore the influence of various length scales encountered in roughened surfaces, ranging from micrometers to angstroms, and examine the associated physics. The microscale roughnesses are controlled by adjusting the deposition time. A molecular level investigation is employed to probe the intriguing physics of liquid imbibition on the created rough surface. The molecular analysis of droplet contact line dynamics, including the contact angle and footprint radius, shows qualitative alignment with the real systems. Additionally, this study provides new insights into the flow velocities during imbibition within surface asperities at the molecular level. Directional velocities, such as axially downward and horizontally outward flows, which are otherwise challenging to measure experimentally, are also evaluated on a molecular scale. These findings provide a fundamental understanding of the intricate phenomena of liquid spreading and imbibition on metallic surfaces with randomly distributed rough textures, deepened by molecular-scale insights. The agreement, on a qualitative scale, between the experiments and simulations is successfully established, providing a fundamental understanding of the complex phenomena of water droplet imbibition dynamics on an electrodeposited surface.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"254 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684580","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

Feasibly Developing Polyester-Type Poly(vinyl alcohol) Adhesive in One Go with High Water Resistance and Bonding Performance 一次即可开发出具有高耐水性和粘接性能的聚酯型聚乙烯醇粘合剂

IF 3.9 2区化学

Langmuir Pub Date : 2024-11-21 DOI: 10.1021/acs.langmuir.4c03412

Dandan Xu, Chunyin Li, Yuchen Zhou, Zhinan Wang, Defa Hou, Hong Lei, Zhangmin Chen, Guanben Du

{"title":"Feasibly Developing Polyester-Type Poly(vinyl alcohol) Adhesive in One Go with High Water Resistance and Bonding Performance","authors":"Dandan Xu, Chunyin Li, Yuchen Zhou, Zhinan Wang, Defa Hou, Hong Lei, Zhangmin Chen, Guanben Du","doi":"10.1021/acs.langmuir.4c03412","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c03412","url":null,"abstract":"Water-soluble poly(vinyl alcohol) (PVA) has great potential for the preparation of environmentally friendly adhesives. However, the application of PVA adhesives in the wood industry has been limited by their poor water and mildew resistance. Herein, a polyester-type PVA adhesive (CPVA) with good bonding performance, water resistance, and antimildew performance was synthesized using PVA and citric acid (CA). The cross-linking reaction, including esterification between PVA and CA chains and etherification between PVA chains, was demonstrated by Fourier-transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS). Due to the cross-linked structure of the reaction, the CPVA1 (mass ratio of CA/PVA = 1:1) adhesive showed a low soluble content of 5% when it was soaked in water for 24 h. The dry strength, warm water (63 °C) strength, and hot water (93 °C) strength of the plywood hot-pressed from the CPVA1 adhesive at 200 °C were 1.06 1.52, and 1.45 MPa, respectively, which met the Chinese National Standard GB/T 9846-2015. The developed CPVA adhesive also adhered to glass and steel at room temperature. Therefore, the CPVA adhesive developed in this study can serve as a potential candidate for the production of nonformaldehyde wood-based composites with excellent bonding strength, water resistance, and mildew resistance.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"1 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685069","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

Cobalt Incorporation Promotes CO2 Desorption from Nickel Active Sites Encapsulated by Nitrogen-Doped Carbon Nanotubes in Urea-Assisted Water Electrolysis 掺氮碳纳米管封装的镍活性位点在尿素辅助水电解中的钴掺入促进了二氧化碳解吸

IF 3.9 2区化学

Langmuir Pub Date : 2024-11-21 DOI: 10.1021/acs.langmuir.4c03711

Quan Zhang, Shuangxiu Ma, Yuhua Xie, Shuyuan Pan, Zhengpei Miao, Jiatang Wang, Zehui Yang

{"title":"Cobalt Incorporation Promotes CO2 Desorption from Nickel Active Sites Encapsulated by Nitrogen-Doped Carbon Nanotubes in Urea-Assisted Water Electrolysis","authors":"Quan Zhang, Shuangxiu Ma, Yuhua Xie, Shuyuan Pan, Zhengpei Miao, Jiatang Wang, Zehui Yang","doi":"10.1021/acs.langmuir.4c03711","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c03711","url":null,"abstract":"The potential application prospects of urea-assisted water electrolysis toward hydrogen production in renewable energy infrastructure can effectively alleviate energy shortages and environmental pollution caused by rich urea wastewater. It is of prominent significance that adjusting the CO2 desorption of nickel-based electrocatalysts can overcome the slow reaction kinetics for urea oxidation reaction (UOR) to achieve exceptional catalytic activity. In this work, cobalt (Co) metal doping is employed to boost the UOR performance of nitrogen-doped carbon nanotubes encapsulating nickel nanoparticle electrocatalysts (Ni@N-CNT). The influence of diverse Co doping concentrations on the performance of UOR and hydrogen evolution reaction (HER) catalytic activities associated with stability are systematically investigated. The Co dopant can effectively promote the dynamical conversion of Ni to Ni3+ species; as a result, the UOR catalytic activity is improved by 1.8-fold at 1.6 V vs RHE. The DFT calculation results show that the CoNi bimetallic structure possesses a comparably lower binding energy for CO2 adsorption accelerating the rate-limiting step. Meanwhile, the Co dopant also boosts the HER performance, achieving a 57 mV reduction in overpotential at 100 mA cm–2 due to the creation of more active sites. In addition, the assembled urea-assisted water electrolysis attains 10 mA cm–2 at merely 1.51 V as well as excellent stability.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"71 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684658","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

Hydrophilic Modification of Macroscopically Hydrophobic Mineral Talc and Its Specific Application in Flotation 宏观疏水性矿物滑石的亲水改性及其在浮选中的具体应用

IF 3.9 2区化学

Langmuir Pub Date : 2024-11-21 DOI: 10.1021/acs.langmuir.4c03437

Zechao Huangfu, Wei Sun, Hongliang Zhang, Chen Chen, Chenyang Zhang

{"title":"Hydrophilic Modification of Macroscopically Hydrophobic Mineral Talc and Its Specific Application in Flotation","authors":"Zechao Huangfu, Wei Sun, Hongliang Zhang, Chen Chen, Chenyang Zhang","doi":"10.1021/acs.langmuir.4c03437","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c03437","url":null,"abstract":"Sodium diethyldithiocarbamate (DDTC), a common collector used to enhance the hydrophobicity of minerals in froth flotation, nevertheless weakens the hydrophobicity of the talc surface. To rationalize this anomaly, the interactions of a hydrophobic alkyl group and hydrophilic mineralophilic group (−NCS2–) of heteropolar surfactant DDTC, and a water molecule with the talc (001) surface, were investigated. Herein, DFT simulations found that the talc (001) surface features natural hydrophobicity determined by the competition between adhesion (surface water) and cohesion (water–water interactions). The interaction of the hydrophobic alkyl group of DDTC with the talc surface is more favorable compared to that of the −NCS2– group and H2O, favoring the hydrophilic modification of the talc surface. Additionally, adsorption isotherms, time-of-flight secondary ion mass spectrometry (ToF-SIMS), microflotation tests, and contact angle measurements also indicate that the differences in adsorption orientation of the heteropolar surfactant DDTC on the talc surface enhance the hydrophilicity of the talc surface, leading to a decreased recovery of the talc. This study provides crucial surface chemistry evidence for the selective adsorption of heteropolar surfactants and contributes to the understanding of the mechanism for the efficient flotation separation of molybdenite from talc.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"54 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684582","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

An Atomistic Investigation of the Inverse Coarsening Process by the Phase-Field Crystal Model 相场晶体模型对反向粗化过程的原子研究

IF 3.9 2区化学

Langmuir Pub Date : 2024-11-21 DOI: 10.1021/acs.langmuir.4c02881

Ying Gao, Can Guo, Shang Sui, Xiangquan Wu, Zhongming Zhang, Sergei Remennik, Daniel Safranchik, Chunjie Xu

引用次数: 0

Quantitatively Elucidating the Trade-Off between Zwitterionic Antifouling Surfaces and Bioconjugation Performance 定量阐释表面防污剂与生物结合性能之间的权衡关系

IF 3.9 2区化学

Langmuir Pub Date : 2024-11-21 DOI: 10.1021/acs.langmuir.4c03827

Pai-Jung Yang, Yu-Ching Hsu, Jie-Ren Li, Shyh-Chyang Luo

{"title":"Quantitatively Elucidating the Trade-Off between Zwitterionic Antifouling Surfaces and Bioconjugation Performance","authors":"Pai-Jung Yang, Yu-Ching Hsu, Jie-Ren Li, Shyh-Chyang Luo","doi":"10.1021/acs.langmuir.4c03827","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c03827","url":null,"abstract":"Zwitterionic materials, known for their high hydrophilicity, are widely used to minimize the nonspecific adsorption of biomolecules in complex biological solutions. However, these materials can also reduce the capture efficiency between targets and peptide probes. To demonstrate how antifouling surfaces affect capture efficiency, we utilize a poly(3,4-ethylenedioxythiophene) (PEDOT)-based surface incorporating varying ratios of phosphorylcholine (PEDOT-PC) and maleimide functional groups to achieve both antifouling properties and peptide–protein binding. As a model system, the peptide YWDKIKDFIGGSSSSC, attached via maleimide groups, is used to capture the target protein, calmodulin (CaM). By systematically monitoring protein binding on both antifouling and peptide-immobilized PEDOT surfaces using a quartz crystal microbalance with dissipation, the results reveal that PEDOT-PC reduces both the specific binding between peptides and target proteins as well as the rate of protein fouling on the electrode surface. From these findings, we propose an equation for quantitative analysis. Furthermore, electrochemical impedance spectroscopy and differential pulse voltammetry are performed to measure the changes in the impedance in CaM solutions. The data indicate that impedance increases with protein adsorption, confirming the practical utility of the designed electrode surface.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"26 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684661","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

Mechanism of Cu Ion Targeting Combined with an Organic Depressant To Enhance the Flotation Depression of Pyrite 铜离子靶向与有机抑制剂相结合以增强黄铁矿浮选抑制作用的机理

IF 3.9 2区化学

Langmuir Pub Date : 2024-11-21 DOI: 10.1021/acs.langmuir.4c04144

Wanyi Li, Xu Bai, Jian Liu, Mingjie Chen, Jiamei Hao, Hulin Gao

{"title":"Mechanism of Cu Ion Targeting Combined with an Organic Depressant To Enhance the Flotation Depression of Pyrite","authors":"Wanyi Li, Xu Bai, Jian Liu, Mingjie Chen, Jiamei Hao, Hulin Gao","doi":"10.1021/acs.langmuir.4c04144","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c04144","url":null,"abstract":"In this study, pyrite was used as the research object, and the behavior and mechanism of a copper-ion-enhanced organic depressant in depressing pyrite flotation were studied. Microflotation experiments showed that, after the addition of CuSO4 and N,N-dimethyldithiocarbamate (N,N-DDS), the floating collection efficiency of pyrite declined from 82.37 to 21.03% at pH 8.5. Infrared spectroscopy studies indicated that the addition of CuSO4 caused a significant enhancement in the characteristic N,N-DDS peaks on the pyrite surface. X-ray photoelectron spectroscopy (XPS) revealed that, following the addition of CuSO4 and N,N-DDS, the relative atomic concentration of N 1s considerably enhanced on the surface of pyrite, with N 1s derived from N,N-DDS. Time-of-flight secondary ion mass spectrometry showed that, before and after the addition of CuSO4, the normalized peak values of CSN– on the pyrite superficial layer were 0.0116 and 0.0032, respectively. All of the above-mentioned results indicate that the Cu ion promotes the adsorption of N,N-DDS on pyrite and facilitates the formation of complex ((CH3)2NCSS)2Cu. The N and S atoms in −NCS and metal ions formed chemical bonds, which were the primary mechanism of the interaction between N,N-DDS and pyrite. This process reduces the floatability of pyrite and achieves the selective depression of pyrite.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"17 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684659","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

Molecular Insights into the Concentration Dependent Promotion Effect of Tetrabutylammonium Bromide on Hydrate Growth: A Molecular Dynamics Simulation Study 四丁基溴化铵对水合物生长的浓度依赖性促进效应的分子见解：分子动力学模拟研究

IF 3.9 2区化学

Langmuir Pub Date : 2024-11-21 DOI: 10.1021/acs.langmuir.4c03852

Fangning Fan, Han Jia, Qiuxia Wang, Yuanbo Wang, Xin Wei, Xu Li, Shijie Wen, Qiang Wang, Kaihe Lv, Pan Huang

{"title":"Molecular Insights into the Concentration Dependent Promotion Effect of Tetrabutylammonium Bromide on Hydrate Growth: A Molecular Dynamics Simulation Study","authors":"Fangning Fan, Han Jia, Qiuxia Wang, Yuanbo Wang, Xin Wei, Xu Li, Shijie Wen, Qiang Wang, Kaihe Lv, Pan Huang","doi":"10.1021/acs.langmuir.4c03852","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c03852","url":null,"abstract":"Tetrabutylammonium bromide (TBAB) has been proven to improve the growth of hydrate via experimental methods, which may be attributed to its different concentrations. In this study, the molecular dynamics (MD) simulation is employed to investigate the concentration dependent promotion effect of TBAB on the growth of CO2 hydrate. The tetrahedral order parameter, number of cages, hydrate crystal growth trajectories, significant microconfigurations, and distribution of CO2 and TBAB are analyzed in detail. It is found that the promotion effect of TBAB is more prominent at low concentrations (5 and 10 wt %) than that at high concentrations (15 and 20 wt %). During the growth of hydrate crystal, tetrabutylammonium (TBA+) ions adsorb on the hydrate crystal and serve as guest molecules to form TBA+ semiclathrate hydrate cages. Then, the TBA+ semiclathrate hydrate cages undergo a self-adjustment process and induce the generation of CO2 hydrate cages. At high concentrations, the great accumulation of TBA+ at the hydrate–liquid interface disturbs the effective adsorption and self-adjustment processes, and the tightly packed arrangement of TBA+ at the gas–liquid interface partially inhibits the mass transfer of CO2. This study provides visible mechanisms of the concentration dependent promotion effect of TBAB from the microscopic level, which complements the vacancy in experimental studies.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"70 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684584","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

Influences of Coagulant Polarity on the Modulus of the Chitin Hydrogel 凝固剂极性对甲壳素水凝胶模量的影响

IF 3.9 2区化学

Langmuir Pub Date : 2024-11-21 DOI: 10.1021/acs.langmuir.4c03309

Peng Cao, Junchao Huang

{"title":"Influences of Coagulant Polarity on the Modulus of the Chitin Hydrogel","authors":"Peng Cao, Junchao Huang","doi":"10.1021/acs.langmuir.4c03309","DOIUrl":"https://doi.org/10.1021/acs.langmuir.4c03309","url":null,"abstract":"The chitin hydrogel draws great attention in biomedical fields owing to its high similarity and good affinity for peptides. The conversion of raw chitin to the designed hydrogel through a sol–gel process prevails, while the modulus of the chitin hydrogel is significantly influenced by the factors of gelation technology (i.e., coagulation, involving polymer chain rearrangement and the reconstruction of multiple interactions). Water and several organic solvents such as ethanol, DMAc, and DMSO are effective coagulants for aqueous chitin/KOH/urea solutions. In particular, the concentration of aqueous ethanol solutions displays a high dependency on the modulus of chitin hydrogels. However, recent reports about chitin hydrogel fabrication seldom demonstrate the effect of coagulant factors on hydrogel performance. Our study found that the polarity of the coagulant and its diffusion index for entry into the chitin solution during the coagulation process had a direct influence on the hydrogel modulus. The influence of the two factors was investigated to find out their quantified relationship with the hydrogel modulus, which will inspire a practical method to develop new coagulants to prepare modulus-manipulable chitin hydrogels.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"18 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678989","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

Preparation of Nonfouling Zwitterionic Coatings by Plasma-Enhanced Chemical Vapor Deposition under Ambient Pressure 在常压下通过等离子体增强化学气相沉积制备防污型齐聚物涂层

IF 3.9 2区化学

Langmuir Pub Date : 2024-11-20 DOI: 10.1021/acs.langmuir.4c03512

Chengchao Chu, Sihang Liu, Haoyu Xiong, Ziyin Xiang, Yichuan Hu, Shengfu Chen

引用次数: 0