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Size-Dependent Interfacial Tension of Nanodroplets Revealed by In Situ Nuclear Magnetic Resonance Spectroscopy 原位核磁共振波谱技术研究纳米液滴的界面张力
IF 4.4 2区 化学
Langmuir Pub Date : 2026-10-20 Epub Date: 2026-09-24 DOI: 10.1021/acs.langmuir.6c04722
Hongchun Dong, Xingle Wang, Bona Dai, Yefeng Yao, Xiaobing Lou, Qun Chen
{"title":"Size-Dependent Interfacial Tension of Nanodroplets Revealed by In Situ Nuclear Magnetic Resonance Spectroscopy","authors":"Hongchun Dong,&nbsp;Xingle Wang,&nbsp;Bona Dai,&nbsp;Yefeng Yao,&nbsp;Xiaobing Lou,&nbsp;Qun Chen","doi":"10.1021/acs.langmuir.6c04722","DOIUrl":"10.1021/acs.langmuir.6c04722","url":null,"abstract":"<p>Accordingto the Young–Laplace equation, the extreme curvatureof nanodroplets (NDs) and nanobubbles (NBs) should generate immenseinternal pressure, which would theoretically necessitate their rapiddissolution. The long-term stability of NDs and NBs in practice thereforepresents a fundamental challenge to classical thermodynamics, andbridging this gap requires an accurate determination of the internalpressure within these nanostructures. In this work, we demonstratethat by using in situ nuclear magnetic resonance (NMR) to monitorthe <sup>19</sup>F signal of perfluoropropane (C<sub>3</sub>F<sub>8</sub>) NDs in water during pressure reduction, we quantitativelydetermine the internal pressure of NDs. Our results reveal that thederived interfacial tension of nanodroplets is significantly lowerthan the macroscopic bulk value, exhibiting a pronounced size-dependentdecrease below 180 nm. Furthermore, 2D exchange spectroscopy (EXSY)and spin saturation transfer difference (SSTD) spectroscopy confirmand quantify the bidirectional exchange of C<sub>3</sub>F<sub>8</sub> molecules across the ND interface. Collectively, these thermodynamicand kinetic insights offer compelling evidence to decipher the stabilityof NDs and NBs. Beyond that, the established in situ NMR method providesa versatile paradigm for characterizing nanoscale multiphase systems.</p>","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"42 41","pages":"31052–31060"},"PeriodicalIF":4.4,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149049963","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
Hydrogen Bonding is Required for Continuous Polyvinylpyrrolidone Adhesive Films 连续的聚乙烯吡咯烷酮胶膜需要氢键合
IF 4.4 2区 化学
Langmuir Pub Date : 2026-10-20 Epub Date: 2026-10-08 DOI: 10.1021/acs.langmuir.6c04951
Mahira Mim, An C. N. Nguyen, Mamie Mulder, Hanae Takahashi, Mackenzie Windus, Wei Chen
{"title":"Hydrogen Bonding is Required for Continuous Polyvinylpyrrolidone Adhesive Films","authors":"Mahira Mim,&nbsp;An C. N. Nguyen,&nbsp;Mamie Mulder,&nbsp;Hanae Takahashi,&nbsp;Mackenzie Windus,&nbsp;Wei Chen","doi":"10.1021/acs.langmuir.6c04951","DOIUrl":"10.1021/acs.langmuir.6c04951","url":null,"abstract":"<p>The versatility ofpolyvinylpyrrolidone (PVP) as a dispersingandadhesive agent lies in its amphiphilicity and hydrogen bonding capability.In this study, silicon wafers (SiO<sub>2</sub>) were silanized with <em>N</em>-(2-aminoethyl)-3-aminopropyltriethoxysilane (AEAPTES),(<em>N</em>,<em>N</em>-dimethylamino)trimethylsilane(TMS), and n-octyldimethylchlorosilane (C8) to construct four substrateswith varying fractions of hydrogen bonding sites and hydrophobic groups.PVP thin films were fabricated on the substrates using both staticadsorption and spin coating methods. PVP spontaneously adsorbs toand results in 1 nm-thick films on all the substrates, demonstratingthe polymer’s capability as a universal adhesive. The continuityof the dried PVP films at the nanoscopic and micron scales was imagedusing atomic force and optical microscopy, respectively. The filmstability was correlated to the fraction of substrate hydrogen bondingsites. The films are stable on SiO<sub>2</sub> with 100% hydrogenbonding sites, unstable on TMS with 100% hydrophobic groups, and metastableon AEAPTES and C8 with a mixture of hydrogen bonding sites and hydrophobicgroups.</p>","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"42 41","pages":"31061–31069"},"PeriodicalIF":4.4,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149151115","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
Dual-Functional, Visible-Light-Responsive Gemini Surfactants for Interfacial Catalysis of Knoevenagel Condensation in Emulsion Microreactors under Mild Conditions 双功能、可见光响应Gemini表面活性剂在温和条件下催化乳液微反应器中Knoevenagel缩合
IF 3.9 2区 化学
Langmuir Pub Date : 2026-10-20 DOI: 10.1021/acs.langmuir.6c05172
Rui Zhao,Hubin Chen,Anxin Lin,Zhen Lu,Longqiang Xiao,Linxi Hou
{"title":"Dual-Functional, Visible-Light-Responsive Gemini Surfactants for Interfacial Catalysis of Knoevenagel Condensation in Emulsion Microreactors under Mild Conditions","authors":"Rui Zhao,Hubin Chen,Anxin Lin,Zhen Lu,Longqiang Xiao,Linxi Hou","doi":"10.1021/acs.langmuir.6c05172","DOIUrl":"https://doi.org/10.1021/acs.langmuir.6c05172","url":null,"abstract":"Fluorinated, visible-light-responsive surfactants incorporating azobenzene units, including Gemini-type architectures, were developed to address limitations in Knoevenagel reactions, such as harsh conditions and challenging product separation. The Gemini surfactant exhibited superior interfacial activity, high solubility, and rapid photoresponsiveness, enabling reversible emulsion switching under visible light. Acting simultaneously as an emulsifier and catalyst, it efficiently promoted Knoevenagel reactions under mild conditions, achieving >90% benzaldehyde conversion within 12 h. Mechanistic studies revealed surfactant-facilitated deprotonation, nucleophilic attack, and dehydration. Various benzaldehyde derivatives were successfully converted, and the emulsion maintained high reusability over five cycles. This system offers a light-controlled strategy for catalytic synthesis with facile product separation, promising substrate applicability, and excellent recyclability, highlighting its potential for practical applications in green and efficient chemical synthesis.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"7 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221731","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
pH-Responsive Gas Marbles Stabilized with Polymer Particles Carrying a Polyacid Steric Stabilizer 带有聚酸位阻稳定剂的聚合物颗粒稳定ph响应气体弹珠
IF 3.9 2区 化学
Langmuir Pub Date : 2026-10-20 DOI: 10.1021/acs.langmuir.6c04925
Atsushi Nishikawa,Takanori Yasui,Anne-Laure Fameau,Tomoyasu Hirai,Syuji Fujii
{"title":"pH-Responsive Gas Marbles Stabilized with Polymer Particles Carrying a Polyacid Steric Stabilizer","authors":"Atsushi Nishikawa,Takanori Yasui,Anne-Laure Fameau,Tomoyasu Hirai,Syuji Fujii","doi":"10.1021/acs.langmuir.6c04925","DOIUrl":"https://doi.org/10.1021/acs.langmuir.6c04925","url":null,"abstract":"Gas marbles are particle-stabilized soft dispersed systems consisting of a soap-bubble-like air-in-water-in-air architecture. Herein, we report gas marbles stabilized by polystyrene particles carrying poly(acrylic acid) (PAA) steric stabilizers, which impart alkaline-responsive behavior to the assemblies. Unlike liquid marbles prepared from the same particles, the gas marbles could be fabricated over a broad size range while maintaining an almost perfectly spherical shape. They also exhibited remarkable stability on aqueous surfaces under acidic and neutral conditions, whereas exposure to alkaline solutions induced rapid disruption and release of the encapsulated gas owing to deprotonation of the surface-grafted PAA chains. In addition, the lifetime of the gas marbles was found to be strongly governed by evaporation of the thin water layer surrounding the gas core. Increasing the ambient relative humidity prolonged the lifetime from only a few tens of minutes at a relative humidity below 40% to more than 7 days above 70%. Furthermore, the gas marbles exhibited amphibious motion, allowing repeated transfer between air–water and air–solid interfaces while maintaining their integrity. These findings demonstrate that interfacial particle design and environmental conditions provide effective means of controlling gas-marble stability and responsiveness, establishing a basis for future studies on gas encapsulation, transport, and triggered release.","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"82 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221727","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
The Impact of Crystal Phase on Rectification Properties of TaSi2P4–WSi2P4 Lateral Heterojunctions 晶体相位对TaSi2P4-WSi2P4横向异质结整流性能的影响
IF 4.4 2区 化学
Langmuir Pub Date : 2026-10-20 Epub Date: 2026-10-06 DOI: 10.1021/acs.langmuir.6c03943
Yu-Hao Guo, Wei-Kang Zhang, Chuan-Kui Wang, Xiao-Xiao Fu
{"title":"The Impact of Crystal Phase on Rectification Properties of TaSi2P4–WSi2P4 Lateral Heterojunctions","authors":"Yu-Hao Guo,&nbsp;Wei-Kang Zhang,&nbsp;Chuan-Kui Wang,&nbsp;Xiao-Xiao Fu","doi":"10.1021/acs.langmuir.6c03943","DOIUrl":"10.1021/acs.langmuir.6c03943","url":null,"abstract":"<p>The Schottky barrier height is generally regarded asthe main factoraffecting the rectifying performance of two-dimensional Schottky diodes.However, the crystal phase of the component two-dimensional materialsalso exerts a significant influence on the electrical properties ofthe diodes, and the underlying mechanism remains unclear. Based onthe first-principles calculations, we take the lateral heterojunctionsconsisting of metallic TaSi<sub>2</sub>P<sub>4</sub> and semiconductingWSi<sub>2</sub>P<sub>4</sub> with well-matched lattice constants anddifferent crystal phases as examples to reveal the impact of the crystalphase on the rectification properties. Combined investigations onmaterial work functions, electrostatic difference potential, and interfacialcharge transfer verify the emergence of n-type Schottky contact inTaSi<sub>2</sub>P<sub>4</sub>–WSi<sub>2</sub>P<sub>4</sub> heterostructures.A remarkable rectifying behavior can be observed from the volt–amperecharacteristic curves of the Schottky diodes. The heterojunction diodecomposed of TaSi<sub>2</sub>P<sub>4</sub> and WSi<sub>2</sub>P<sub>4</sub> with different crystal phases and large bandgap exhibitsthe lowest current and the highest rectification ratio (RR) (above10<sup>4</sup>). Here, the crystal phase of the component materialsexerts an important impact on the electrical performance of the diodes,via tuning the bandgap, work function, and interfacial configuration.Increasing the semiconductor layer length within the heterojunctionsystem effectively enhances the rectification performance, since thecurrent asymmetry under forward and reverse bias is increased as thesemiconductor length expands. A respectable RR of near 10<sup>5</sup> is achieved in the heterojunction diode at low bias voltages bymerely altering the central transition metal atomic layer within theseptuple-atomic-layer materials. It may be promising to realize bylateral epitaxial growth of the heterojunction than those systemscontaining multiple distinct atomic layers in a septuple-atomic-layerstructure. These calculations provide an insightful understandingof the influence factors on the rectification properties of lateralheterojunctions and also provide a guideline for the design of high-performancerectifiers.</p>","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"42 41","pages":"30761–30771"},"PeriodicalIF":4.4,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149091893","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
Adsorption of Polyolefins from Alkanes on Alumina and Silica 铝和硅对烷烃中聚烯烃的吸附
IF 4.4 2区 化学
Langmuir Pub Date : 2026-10-20 Epub Date: 2026-10-05 DOI: 10.1021/acs.langmuir.6c03006
Fawaz Motolani, Mason D. Jones, Dayrl Briggs, Bert D. Chandler, Brian K. Long, Candice Halbert, S. Michael Kilbey, II, Bryan D. Vogt
{"title":"Adsorption of Polyolefins from Alkanes on Alumina and Silica","authors":"Fawaz Motolani,&nbsp;Mason D. Jones,&nbsp;Dayrl Briggs,&nbsp;Bert D. Chandler,&nbsp;Brian K. Long,&nbsp;Candice Halbert,&nbsp;S. Michael Kilbey, II,&nbsp;Bryan D. Vogt","doi":"10.1021/acs.langmuir.6c03006","DOIUrl":"10.1021/acs.langmuir.6c03006","url":null,"abstract":"<p>Heterogeneous catalytic deconstruction of polyolefinsoffers apromising route to upcycle plastic waste into higher-value products,yet the fundamental insights needed to control product distributionsremain limited. As the reactions proceed, deconstruction generatesa distribution of polymer fragments and small molecules whose adsorptionto catalyst supports influence accessibility to active sites and subsequentreaction pathways. Here, we use <em>in situ</em> neutron reflectivityto quantify the adsorption of polyethylene (PE) and isotactic polypropylene(iPP) onto planar alumina and silica surfaces, which serve as idealizedmodel support surfaces for catalytic upcycling, from oligomeric alkane(dodecane and tetradecane) solutions. Fits of the reflectivity datareveal that the underlying oxide has a surprisingly large impact onthe structure of the adsorbed polymer layer and the total amount ofpolymer adsorbed. PE adsorption from tetradecane on alumina yieldsrelatively thin (∼2 nm) adsorbed layers that contain ∼20–40%solvent. A much thicker adsorbed PE layer from dodecane solution isobserved on silica. The adsorbed PE extends tens of nanometers fromthe silica surface. The PE densifies near the silica surface withexclusion of alkane solvent, but there is also a diffuse layer containing&gt;50% solvent that extends further into the solution. This structuringon the silica surface is attributed to the combination of train andloop morphologies for the adsorbed PE. For both surfaces, the totalamount of PE adsorbed is greater than that for iPP under comparableconditions. Surprisingly, PE adsorption on alumina is only weaklydependent on its molar mass (10–200 kg/mol) and almost insensitiveto temperature (140 vs 160 °C). These results offer fundamentalinsight into adsorption of polyolefins onto surfaces, which may proveuseful for improving models to describe catalytic upcycling of polyolefinwastes.</p>","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"42 41","pages":"30561–30571"},"PeriodicalIF":4.4,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149091899","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
Combined Control of Rice Sheath Blight Using a Biobased Pickering Emulsion Co-Formulated with Two Pesticides 生物基酸洗乳剂与两种农药联合防治水稻纹枯病
IF 4.4 2区 化学
Langmuir Pub Date : 2026-10-20 Epub Date: 2026-10-08 DOI: 10.1021/acs.langmuir.6c05083
Hanchen Lin, Yuwei Cai, Chaoqun You, Fei Wang
{"title":"Combined Control of Rice Sheath Blight Using a Biobased Pickering Emulsion Co-Formulated with Two Pesticides","authors":"Hanchen Lin,&nbsp;Yuwei Cai,&nbsp;Chaoqun You,&nbsp;Fei Wang","doi":"10.1021/acs.langmuir.6c05083","DOIUrl":"10.1021/acs.langmuir.6c05083","url":null,"abstract":"<p>Ricesheath blight, a globally significant disease causedby <em>Rhizoctonia solani</em> (<em>R. solani</em>), can be effectively managed through acodelivery technology thatcombines the action of two pesticides. This approach, which involvesmultitargeted, coordinated intervention against the pathogen, enhancesthe efficacy of pesticides and reduces the required dosage. Therefore,this study employed electrostatic self-assembly to prepare chitosan-alkalilignin (AC) nanocomposite particles as stabilizers. Through systematicoptimization of oil–water ratio and ultrasonic power, a noveldual-drug Pickering emulsion delivery system (AZO@ACVA) was successfullyconstructed for combined efficacy control of rice sheath blight. Thissystem achieves efficient coloading of the hydrophilic pesticide validamycin(VA) and the hydrophobic pesticide azoxystrobin (AZO), demonstratingmultiple functional advantages: within the acidic microenvironmentformed by pathogen infection, the carrier exhibits pH-responsive releaseproperties, enabling intelligent combined efficacy release of bothdrugs. On leaf surfaces, the amphiphilic structure of the AC nanocarriercombined with the combined efficacy effect of Tween 80 significantlyenhances the wetting and adhesion of the emulsion on both hydrophobicrice leaves and hydrophilic cucumber leaves. The deposition levelsreached 2.28 times and 1.89 times that of commercial formulations,respectively, with markedly improved resistance to rain wash-off.Simultaneously, the combined efficacy barrier effect between the lipidphase and lignin effectively delays the photodegradation of pesticides.Antimicrobial experiments demonstrate significant combined efficacyeffects between VA and AZO in this system, resulting in a substantiallyhigher inhibition rate against rice sheath blight pathogens comparedto either commercial pesticide alone. Furthermore, this fully biomass-basedsystem substantially reduces acute toxicity to zebrafish, exhibitingexcellent environmental compatibility. This study presents a biobasedPickering emulsion platform for the codelivery of hydrophilic andhydrophobic pesticides, providing a green and efficient strategy forcontrolling rice sheath blight with reduced environmental impact.</p>","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"42 41","pages":"31090–31103"},"PeriodicalIF":4.4,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149150934","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
Rose Pistil Stigma-Based Biomimetic Adhesion-Controllable Multifunctional Structure for the Stability of Air–Water Interface 基于玫瑰雌蕊柱头的仿生粘附-气-水界面稳定性的可控制多功能结构
IF 4.4 2区 化学
Langmuir Pub Date : 2026-10-20 Epub Date: 2026-10-08 DOI: 10.1021/acs.langmuir.6c03537
Liting Wang, Minghui Guan
{"title":"Rose Pistil Stigma-Based Biomimetic Adhesion-Controllable Multifunctional Structure for the Stability of Air–Water Interface","authors":"Liting Wang,&nbsp;Minghui Guan","doi":"10.1021/acs.langmuir.6c03537","DOIUrl":"10.1021/acs.langmuir.6c03537","url":null,"abstract":"<p>Bionic functional structured surfaces have been widelyappliedin many fields. This study focuses on the structural biomimicry, fabricationprocesses, and applications of RPS (rose pistil stigma) that combinesuperhydrophobicity with high adhesion. However, the large-scale fabricationof controllable, regular, hierarchical, and complex structures oncurved substrates remains limited by current manufacturing technologies.Therefore, achieving technological breakthroughs through simple, rapid,environmentally friendly, and energy-free strategies is an urgentscientific challenge and an important direction for the developmentof green manufacturing processes. BRPS (biomimetic rose pistil stigma)with both superhydrophobicity and high adhesion were fabricated usinga dip-coating and lift-up combined with a chemical oxidation process.Natural polymer α-cellulose microparticles were incorporatedinto the PDMS prepolymer to enhance the surface roughness and mechanicalstrength of the microstructures. The results show that when the surfacepossesses appropriate microstructural features, the BRPS array exhibitsmacroscopic superhydrophobicity. The tunable adhesion behavior ofthe array can be tuned by adjusting the number of BRPS units, makingit promising for potential applications such as micromanipulatorsfor droplet manipulation. In addition, a novel antifouling strategybased on the BRPS array is demonstrated. The BRPS enables multistepmechanical transfer and release of individual droplets, and it canalso retain an air cushion underwater, resulting in remarkable antifoulingperformance; therefore, it is of great significance for advancingantifouling technologies for marine construction surfaces.</p>","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"42 41","pages":"30687–30698"},"PeriodicalIF":4.4,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149150936","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
Minimalistic Copper Amino Acid Assemblies as Laccase Mimics for Oxidative Pollutant Removal 极简铜氨基酸组装体作为氧化污染物去除的漆酶模拟物
IF 4.4 2区 化学
Langmuir Pub Date : 2026-10-20 Epub Date: 2026-10-07 DOI: 10.1021/acs.langmuir.6c03735
Jiqian Wang, Yuqi Wang, Zeyu Wu, Shike Lai, Chen Wang, Dong Wang
{"title":"Minimalistic Copper Amino Acid Assemblies as Laccase Mimics for Oxidative Pollutant Removal","authors":"Jiqian Wang,&nbsp;Yuqi Wang,&nbsp;Zeyu Wu,&nbsp;Shike Lai,&nbsp;Chen Wang,&nbsp;Dong Wang","doi":"10.1021/acs.langmuir.6c03735","DOIUrl":"10.1021/acs.langmuir.6c03735","url":null,"abstract":"<p>Laccase, a typical multicopper oxidase, catalyzes theoxidationof phenolic and aromatic compounds using molecular oxygen as the terminalelectron acceptor, but its practical application is often hinderedby high production cost, complicated preparation procedures, and limitedoperational stability. Herein, we report a simple yet effective strategyto construct laccase-mimicking artificial enzymes through the coordinationof Cu<sup>2+</sup> with acidic amino acids as minimal biomolecularbuilding blocks. By varying ligand structure and chirality, a seriesof copper-based amino-acid nanozymes were obtained, including CuAsp<sup>L</sup>, CuAsp<sup>D</sup>, CuGlu<sup>L</sup>, and CuGlu<sup>D</sup>. Among the four assemblies, CuGlu<sup>L</sup> exhibited the highestapparent laccase-like activity in the 2,4-DCP/4-AAP model reactionunder identical catalyst mass-loading conditions. Structural characterizationrevealed ligand-dependent differences in assembly morphology and coppervalence-state distribution, which coincided with differences in apparentcatalytic activity among the four assemblies. In addition to appreciablecatalytic activity, the artificial enzymes showed excellent stabilityover a broad temperature range and under near-neutral to weakly alkalineconditions. They also demonstrated promising applicability in theoxidative degradation of representative endocrine-disrupting pollutants,including triclosan and diclofenac. This work provides a low-costand scalable route for constructing laccase-mimicking catalysts fromsimple amino-acid-metal coordination and offers insights into thedesign of robust biomimetic catalysts for environmental applications.</p>","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"42 41","pages":"30718–30729"},"PeriodicalIF":4.4,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149151119","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-Loaded Peanut Shell Biochar Enables Nonradical Peroxymonosulfate Activation for Rapid Tetracycline Degradation 负载钴的花生壳生物炭使非自由基过氧单硫酸盐活化快速降解四环素
IF 4.4 2区 化学
Langmuir Pub Date : 2026-10-20 Epub Date: 2026-10-08 DOI: 10.1021/acs.langmuir.6c04219
Chenglong Li, Qian Tang, Hui Feng, Jialin Song, Ting Wang, Yuwei Sun, Yonghui Gao
{"title":"Cobalt-Loaded Peanut Shell Biochar Enables Nonradical Peroxymonosulfate Activation for Rapid Tetracycline Degradation","authors":"Chenglong Li,&nbsp;Qian Tang,&nbsp;Hui Feng,&nbsp;Jialin Song,&nbsp;Ting Wang,&nbsp;Yuwei Sun,&nbsp;Yonghui Gao","doi":"10.1021/acs.langmuir.6c04219","DOIUrl":"10.1021/acs.langmuir.6c04219","url":null,"abstract":"<p>Conventional peroxymonosulfate (PMS) activation systemsare oftendominated by nonselective radical pathways, which limit oxidationefficiency. Herein, a cobalt-loaded peanut shell biochar (Co-BC) wassynthesized via a co─impregnation–pyrolysis strategyfor efficient PMS activation and tetracycline (TC) degradation. Theoptimized Co-BC (1:2:1.5–600) achieved nearly complete TC removalwithin 10 min with a high rate constant (<em>k</em><sub>obs</sub> = 0.4911 min<sup>–1</sup>). Characterization results showthat the excellent performance is attributed to defect-rich carbonstructures, well-developed porosity, and cobalt sites involving Co<sup>2+</sup>/Co<sup>3+</sup> redox cycling. Correlation analysis indicatesthat carbon defects and Co loading are closely associated with catalyticactivity. Mechanistic studies indicate that the reaction is dominatedby a nonradical pathway. Singlet oxygen (<sup>1</sup>O<sub>2</sub>) is identified as the main reactive species, while <sup>•</sup>OH and SO<sub>4</sub><sup>•–</sup> contribute relativelylittle. DFT results further reveal that cobalt incorporation enhancesPMS adsorption and interfacial charge redistribution, favoring subsequentPMS activation. The catalyst also shows good magnetic recoverabilityand applicability under various water chemistry conditions and remainscatalytically active after eight consecutive cycles. This study providesinsight into designing efficient biomass-derived catalysts for predominantlynonradical PMS activation.</p>","PeriodicalId":50,"journal":{"name":"Langmuir","volume":"42 41","pages":"30847–30862"},"PeriodicalIF":4.4,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149151124","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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