Colloids and Surfaces A: Physicochemical and Engineering Aspects最新文献

{"title":"Chitosan-derived carbon-Co3O4 /MXene composites for lithium-ion batteries anode","authors":"Yuzhe Gao ,&nbsp;Keyu Li ,&nbsp;Feng Li ,&nbsp;Xinyi Jiang ,&nbsp;Junying Zhang ,&nbsp;Hui Li ,&nbsp;Pengcheng Li ,&nbsp;Xiaoming Zhang","doi":"10.1016/j.colsurfa.2026.139843","DOIUrl":"10.1016/j.colsurfa.2026.139843","url":null,"abstract":"<div><div>Transition metal oxides have attracted extensive attention as promising anode materials for lithium-ion batteries (LIBs) owing to their low cost and high theoretical capacities. Among them, spinel Co₃O₄ stands out due to its high reversible capacity and favorable electrochemical activity. However, severe volume expansion and rapid capacity decay during long-term cycling significantly limit its practical application. In this work, a Co₃O₄-CTS/MXene composite is rationally designed and synthesized through a combination of solvothermal treatment and electrostatic self-assembly, where chitosan-derived carbon spheres (CTS) and MXene nanosheets are simultaneously introduced. The CTS matrix effectively buffers volume variation, while MXene nanosheets construct a continuous conductive network, synergistically enhancing structural integrity and charge transport. As a result, the Co₃O₄-CTS/MXene anode exhibits improved cycling stability and rate performance compared with pristine Co₃O₄. These results demonstrate that the Co₃O₄-CTS/MXene composite is a promising anode candidate for lithium-ion batteries with enhanced electrochemical stability, and highlight the application potential of biomass-derived materials in advanced energy storage devices.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"737 ","pages":"Article 139843"},"PeriodicalIF":5.4,"publicationDate":"2026-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146116379","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":"Gelatin-based eutectogel for water-triggered release of tebuconazole in humid and rainy agricultural environments","authors":"Honglei Zhao,&nbsp;Liya Zhang,&nbsp;Zeyi Wang,&nbsp;Shumei Zhai,&nbsp;Jingcheng Hao","doi":"10.1016/j.colsurfa.2026.139796","DOIUrl":"10.1016/j.colsurfa.2026.139796","url":null,"abstract":"<div><div>Spray application of pesticides increases the air humidity and promotes the spread of moisture-loving diseases. Existing hydrogels used for pesticides local applications cannot simultaneously meet the requirements of improving loading amount, reducing costs, and increasing utilization of pesticides in humid and rainy conditions. In this work, a gelatin-based eutectogel was developed using betaine (BET) and ethylene glycol (EG) as the deep eutectic solvent (DES) system for tebuconazole (Teb) delivery. The gelatin/BET-EG eutectogel owned a Teb loading capacity 89.4 times higher than that of a gelatin hydrogel. The cumulative release rate of Teb in water reached 77 % after 7 days, which followed first-order kinetic equation, and the DES in gelatin/BET-EG eutectogel was confirmed to be replaced by water. Under 70 % relative humidity and 300 wt% water infiltration conditions, the highest release rates of Teb were 47 % and 55 %, respectively. The release rates of Teb in gels suspended in the air and placed on the soil surface were 22 % and 42 % respectively after 10 min of simulated rainfall. Further research confirmed the influence by loading amount, pH, temperature, and soil type on water-triggered Teb release. The eutectogel degraded rapidly within 10 days in soil and showed negligible toxicity to <em>Chlorella vulgaris</em> (72 h, IC₅₀ = 21.23 g/L). These findings highlighted the potential of gelatin/BET-EG eutectogel as a green and efficient platform for pesticide delivery in sustainable agriculture.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"737 ","pages":"Article 139796"},"PeriodicalIF":5.4,"publicationDate":"2026-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146076405","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":"Structure and surface of Ca10-xBix(PO4)6(OH)2-xOx solid solutions for light-driven photocatalytic degradation of oxytetracycline","authors":"S. Fatine ,&nbsp;J. Khmiyas ,&nbsp;A. Hami ,&nbsp;L. Sbabou ,&nbsp;A. Laghzizil","doi":"10.1016/j.colsurfa.2026.139776","DOIUrl":"10.1016/j.colsurfa.2026.139776","url":null,"abstract":"<div><div>This study highlights the effect of oxygen vacancies generated by the substitution of Ca²⁺ with Bi³⁺ in Ca_10-xBi_x(PO₄)₆(OH)_2-xO_x apatites for photocatalytic degradation of oxytetracycline (OTC) under UV and visible light. Characterizations reveal that the introduction of Bi³⁺ induces the formation of structural oxygen vacancies and modifies the electronic properties, with a substitution limit fixed at x = 0.3. Photocatalytic tests show that the controlled presence of these vacancies improves charge separation and the generation of reactive species, allowing a complete OTC degradation with x = 0.1. These results demonstrate the key role of Bi substitution and the formed oxygen vacancies in the design of efficient apatite-based photocatalysts.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"737 ","pages":"Article 139776"},"PeriodicalIF":5.4,"publicationDate":"2026-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146076630","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":"Cellulose nanocrystal carrier with schiff base-based responsive drug release","authors":"ChengLin Li ,&nbsp;Youlu Chu ,&nbsp;Shengzhe Zhang ,&nbsp;Wenqian Zhang ,&nbsp;Yi Chen ,&nbsp;Lei Zhang ,&nbsp;Huining Xiao ,&nbsp;Weibing Wu","doi":"10.1016/j.colsurfa.2026.139652","DOIUrl":"10.1016/j.colsurfa.2026.139652","url":null,"abstract":"<div><div>The efficacy of conventional chemotherapy is often compromised by nonspecific distribution and severe systemic toxicity. To mitigate these issues, we developed a pH-responsive drug delivery platform based on cellulose nanocrystals (CNC), which employed a reversible imine bond mechanism for controlled drug release. A one-step periodate oxidation successfully converted CNC into dialdehyde cellulose (DAC), achieving concurrent precise size control (40–80 nm) and introduction of surface aldehyde functionalities. Subsequently, a stepwise functionalization approach was employed: amino-polyethylene glycol (PEG-NH₂) was first grafted onto the DAC surface via a Schiff base reaction, followed by selective reduction to stabilize the linkage, thereby yielding a highly stable and dispersible DAC-PEG intermediate. The remaining aldehyde groups were then utilized to covalently conjugate doxorubicin (DOX) through pH-labile imine bonds, culminating in the final DOX-DAC-PEG nanocarrier. The resulting nanoparticles exhibited characteristics favorable for tumor accumulation, including a near-neutral Zeta potential of −4 mV and a hydrodynamic diameter below 100 nm. More importantly, the system demonstrated remarkable pH-responsive drug release behavior, showing a sustained and minimal release under physiological conditions (pH 7.4), while the release was markedly accelerated in simulated tumor microenvironment (pH 5.5) and lysosomal conditions (pH 3.0) respectively. Cytotoxicity assays confirmed the excellent biocompatibility of the blank DAC-PEG carrier (&gt;90 % cell viability after 24 h). In contrast, the drug-loaded DOX-DAC-PEG nanoparticles effectively leveraged the intracellular acidic milieu to trigger DOX release, exerting significant time- and concentration-dependent inhibitory effects on 4T1 cancer cell proliferation, with a notably low IC₅₀ value of 2.5 μΜ at 48 h.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"737 ","pages":"Article 139652"},"PeriodicalIF":5.4,"publicationDate":"2026-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146045185","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":"Sterically hindered organosilicon surfactants: Synthesis and surface properties in aqueous solutions","authors":"Chen-Qiang Deng ,&nbsp;Peng-Pai Liu ,&nbsp;Ruoshi Chen ,&nbsp;Jin Deng ,&nbsp;Jinqing Jiao ,&nbsp;Lin Wang ,&nbsp;Guanwen Zhang ,&nbsp;Xuqing Lang ,&nbsp;Tian-Jun Gong","doi":"10.1016/j.colsurfa.2026.139915","DOIUrl":"10.1016/j.colsurfa.2026.139915","url":null,"abstract":"<div><div>A series of mixed double-tail silicone-based surfactants by integrating sterically hindered siloxane fragments with various alkyl hydrophobic chains were synthesized. The molecular structures of these surfactants were comfirmed by ¹H and ¹ ³C NMR, FT-IR spectra, and HRMS-ESI. Their behaviors in aqueous solutions were systematically investigated through surface tensiometry, electrical conductivity, transmission electron microscopy, dynamic light scattering, and molecular dynamics simulations. The mixed double-tail silicone-based surfactants demonstrated excellent surface activity and could reduce the surface tension of water to as low as 16.9 mN·m⁻¹ at the critical micelle concentration. The adsorption and aggregation behavior of these surfactants were assessed by the measurement of adsorption efficiency, minimum average molecular area, and thermodynamic parameters. The results revealed that micellization is a spontaneous process, with the driving force transitioning from an entropy-dominated to an enthalpy-dominated mechanism as the hydrophobic alkyl chain length increased. The foamability test showed that the silicone-based surfactant bearing n-hexyl alkyl chains displayed superior foaming ability, achieving a maximum foam volume of 440 mL at 0.5 wt%. Transmission electron microscopy results demonstrated that these surfactant molecules self-assembled into spherical aggregates. Moreover, the size of the aggregates was determined to be in the range from 10 to 160 nm by dynamic light scattering. Molecular dynamics simulations confirmed that the enhanced hydrophobic effect is the dominant factor driving molecular aggregation. These findings highlighted the potential of silicone-based surfactants as environmentally friendly alternatives to fluorocarbon surfactants in fire-fighting.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"737 ","pages":"Article 139915"},"PeriodicalIF":5.4,"publicationDate":"2026-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185354","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":"Spreading and adhesion properties of compressed air foam on vertical facades: Effects of gas-liquid ratio and spray angle","authors":"Yongkang Guo ,&nbsp;Qian Feng ,&nbsp;Zhuoxuan Li ,&nbsp;Lilong Nie ,&nbsp;Agoston Restas ,&nbsp;Kaiyuan Li ,&nbsp;Linlin Yi","doi":"10.1016/j.colsurfa.2026.139829","DOIUrl":"10.1016/j.colsurfa.2026.139829","url":null,"abstract":"<div><div>Compressed air foam offers a promising solution to address the current fire risks on building facades. This study investigates the effects of gas-liquid ratio and spray angle on the spreading and adhesion properties of compressed air foam on facades. The results indicate that as the gas-liquid ratio increases from 4:1–15:1, the foam spreading rate decreases by 3 times, while the foam layer thickness increases by 2.4 times. When the spray angle increases from 0° to 90°, the spreading rate decreases by 50 %, while the foam layer thickness increases by 50 %. The foam spreading rate on vertical facades is approximately 5.1 times that on horizontal liquid surfaces. An increase in the gas-liquid ratio results in a more uniform foam structure and up to 1.4 times increase in apparent viscosity. A reduction in the spray angle intensified gravitational shear and disrupted the foam structure, which results in a decrease in apparent viscosity. The gas-liquid ratio and spray angle affect the apparent viscosity of foam by modulating its intrinsic physical properties and externally applied forces, thereby affecting the foam spreading and adhesion properties. Predictive models are developed to estimate the spreading rate (<span><math><msub><mrow><mi>V</mi></mrow><mrow><mi>s</mi></mrow></msub></math></span>) and foam layer thickness (<span><math><msub><mrow><mi>H</mi></mrow><mrow><mi>f</mi></mrow></msub></math></span>) in relation to the apparent viscosity (<span><math><mi>η</mi></math></span>), which indicate <span><math><mrow><msub><mrow><mi>V</mi></mrow><mrow><mi>s</mi></mrow></msub><mo>∝</mo><mo>−</mo><mn>5.23</mn><mi>η</mi></mrow></math></span> and <span><math><mrow><msub><mrow><mi>H</mi></mrow><mrow><mi>f</mi></mrow></msub><mo>∝</mo><msup><mrow><mi>e</mi></mrow><mrow><mn>0.48</mn><mi>η</mi></mrow></msup></mrow></math></span>.The model predictions providing a theoretical basis for designing the compressed air foam suppression systems for high-rise building facades.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"737 ","pages":"Article 139829"},"PeriodicalIF":5.4,"publicationDate":"2026-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185485","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":"Absorption and interfacial mass transfer characteristics of sulfur dioxide in an electrospray desulfurization system","authors":"Jian Gao ,&nbsp;Junfeng Wang ,&nbsp;Ziwen Zuo ,&nbsp;Huibin Xu ,&nbsp;HaoJie Xu ,&nbsp;Wei Zhang","doi":"10.1016/j.colsurfa.2026.139916","DOIUrl":"10.1016/j.colsurfa.2026.139916","url":null,"abstract":"<div><div>This study investigates the desulfurization performance of four absorbents (sodium hydroxide NaOH, calcium hydroxide Ca(OH)₂, calcium carbonate CaCO₃, and deionized DI water) in a visualized electrospray absorption tower. Increasing the applied voltage (<em>U</em>) significantly enhances atomization quality, thereby expanding the gas-liquid interfacial area and raising the droplet charge-to-mass ratio. Both the SO₂ absorption efficiency (<em>η</em>) and the overall mass transfer coefficient (<em>K</em>_g<em>α</em>) increase with <em>U</em>, exhibiting a strong dependence on the absorbent type. For highly soluble NaOH and moderately soluble Ca(OH)₂, <em>η</em> at 10 kV more than doubles compared to the uncharged state (<em>U</em> = 0 kV). This marked enhancement arises from two synergistic effects: a physical enhancement from the enlarged interfacial area and a chemical enhancement from electric field-driven migration of OH⁻ to the droplet surface. Conversely, CaCO₃ and DI water show limited improvement (&lt; 50 %) due to insufficient OH⁻ availability. The gas-phase mass transfer coefficient (<em>K</em>_g) depends on the electrohydrodynamic atomization mode, remaining stable in dripping mode, decreasing in microdripping mode, and increasing again in oscillating microdripping mode. These findings establish a clear correlation between electrospray characteristics and desulfurization performance, offering crucial guidance for optimizing the absorbent selection and operating parameters in high-efficiency wet flue gas desulfurization systems to reduce water and energy consumption.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"737 ","pages":"Article 139916"},"PeriodicalIF":5.4,"publicationDate":"2026-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185487","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":"Preparation of superhydrophobic coatings of carbonated fly ash and its anti-dew and anti-frost performance","authors":"Huiping Song ,&nbsp;Weitao Song ,&nbsp;Mingxiu Tang ,&nbsp;Xianglei Li ,&nbsp;Yan Zou ,&nbsp;Dapeng Jin ,&nbsp;Zhiwei Bian","doi":"10.1016/j.colsurfa.2026.139907","DOIUrl":"10.1016/j.colsurfa.2026.139907","url":null,"abstract":"<div><div>Condensation and frost can cause severe damage to industrial and domestic facilities. Superhydrophobic coatings are an environmentally friendly and energy-efficient way to mitigate condensation and frost. However, the practical implementation of these coatings for frost and condensation prevention is limited due to their high production costs. Recently, there has been a growing interest in the efficient and high-value utilization of solid waste materials, particularly fly ash (FA). This study focuses on utilizing solid waste fly ash as the primary material and carbonated modified fly ash (CaCO₃-FA) as the filler material for the coating. By adjusting the reaction temperature, controllable nanostructures were constructed on the surface of fly ash. In addition, we have developed an affordable and eco-friendly superhydrophobic coating based on fly ash (CaCO₃-FA coating) that is specifically designed for dew and frost prevention through spray application. In a custom-created environment to simulate dew and frost formation, this coating demonstrates a notable effectiveness in preventing dew and frost, resulting in a 50 % reduction in dew droplet size and a 48 % decrease in frost layer thickness. In addition, this coating has excellent self-cleaning, freeze-thaw resistance and acid and alkali resistance. This simple and economical method for preparing superhydrophobic coatings has great application value in the future.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"737 ","pages":"Article 139907"},"PeriodicalIF":5.4,"publicationDate":"2026-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185473","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-diffusion of active elements in the catalyst and its influence on the catalytic performance","authors":"Zhenyun Zeng ,&nbsp;Shupei Yin ,&nbsp;Linmin Lao ,&nbsp;Guangren Qian ,&nbsp;Jia Zhang ,&nbsp;Mariya Pecherskaya ,&nbsp;Shavkat Mamatkulov ,&nbsp;Olim Ruzimuradov","doi":"10.1016/j.colsurfa.2026.139860","DOIUrl":"10.1016/j.colsurfa.2026.139860","url":null,"abstract":"<div><div>Multi-metallic catalyst is a hot topic in the field of heterogeneous catalysis and it is typically synthesized by the one-pot method. However, seldom report investigates the possibility to generate a similar catalytic performance of a multi-metallic catalyst using its separated components. This work synthesized mono-metallic, bimetallic, and trimetallic ZSM-5 catalysts using Cu, Ce, and Fe exchanging. The obtained catalysts were compared in the catalytic oxidation of acrylonitrile. As a result, when Cu/ZSM-5, Ce/ZSM-5, and Fe/ZSM-5 were used in a series arrangement, the catalytic performance is better than they were used separately. When the well mixture of the three catalysts was used, the catalytic performance is close to that of the one-pot CuCeFe/ZSM-5. Moreover, the activity difference was decreased along with the increasing temperature. The micro-morphological element mappings show that Cu, Ce, and Fe were migrated among ZSM-5. On one hand, this work has prepared an effective catalytic (CuCeFe/ZSM-5) for acrylonitrile oxidation. The biggest removal was 100% at 360°C together with a high N₂ product selectivity (∼100 %). On the other hand, this work has proven that multi-metallic catalyst is feasible to be synthesized by mono-metallic ones separately.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"737 ","pages":"Article 139860"},"PeriodicalIF":5.4,"publicationDate":"2026-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185472","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":"Determination of particle diffusion in a confined fluid layer by dynamic light scattering","authors":"Pranay Kumar Chittem ,&nbsp;Nicolás Salcedo Gálvez ,&nbsp;Paolo Malgaretti ,&nbsp;Jens Harting ,&nbsp;Nicolas Vogel ,&nbsp;Patrick S. Schmidt ,&nbsp;Andreas P. Fröba","doi":"10.1016/j.colsurfa.2026.139892","DOIUrl":"10.1016/j.colsurfa.2026.139892","url":null,"abstract":"<div><div>This work aims to develop a fundamental understanding of the influence of geometric confinement on particle diffusion by its experimental characterization in a fluid layer confined under well-defined conditions using dynamic light scattering (DLS). The confinement was realized using a wedge-shaped sample cell which allowed for the systematic variation of the confinement size, i.e., the wall distance <em>L</em> and the surface characteristics of the confining walls. Applying defined scattering geometries in DLS experiments, comprehensive investigations of particle diffusion considering momentum transfer of particle number density fluctuations with respect to the confining walls were performed. For this, particle diffusivities <em>D</em> were determined by studying confined aqueous dispersions of spherical colloidal silica particles with nominal diameters <em>d</em>_P of (300 and 100) nm at <em>L</em> between (5.3 and 104) µm. A surprising slowing-down of particle diffusion parallel to the walls with decreasing <em>L</em> was identified. In contrast, <em>D</em> characterizing particle diffusion perpendicular to the walls agreed with that of the dispersions in free media for all <em>L</em>, which demonstrates that the momentum transfer of particles perpendicular to the walls is influenced only in the near-contact regime at particle-wall distances similar to <em>d</em>_P. Studying the influence of <em>d</em>_P, it was demonstrated that the confinement-induced slowing-down of <em>D</em> is governed by the relative confinement <em>L</em>/<em>d</em>_P rather than by absolute dimensions. Comparing hydrophilic and hydrophobic characteristics of the confining walls, it was demonstrated that increased hydrodynamic slip at hydrophobic surfaces results in a less pronounced slowing-down of particle diffusion parallel to the walls.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"737 ","pages":"Article 139892"},"PeriodicalIF":5.4,"publicationDate":"2026-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185422","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}