Gaoshuang Zuo, Zhichao Li, Chao Wang, Li Guo, Yanzhong Wang
{"title":"Mildly sulfurized metal-organic frameworks-derived nickel sulfide heterostructures as bifunctional catalysts for efficient water/seawater electrolysis.","authors":"Gaoshuang Zuo, Zhichao Li, Chao Wang, Li Guo, Yanzhong Wang","doi":"10.1016/j.jcis.2025.138647","DOIUrl":"10.1016/j.jcis.2025.138647","url":null,"abstract":"<p><p>The rational design of bifunctional electrocatalysts that simultaneously exhibit exceptional catalytic activity and retain the inherent merits of metal-organic frameworks (MOFs) for overall water electrolysis still presents a critical scientific challenge. Herein, we demonstrate the construction of nanoflower-like heterostructures composed of NiFe-TDC and Ni<sub>3</sub>S<sub>2</sub> (denoted as Ni<sub>3</sub>S<sub>2</sub>@NiFe-TDC) on nickel foam substrates through a simple and mild room-temperature sulfurization strategy, serving as highly active dual-functional electrocatalysts for overall freshwater and seawater splitting. The as-prepared Ni<sub>3</sub>S<sub>2</sub>@NiFe-TDC-60 achieves 10 mA cm<sup>-2</sup> current density with the overpotentials of 81 and 244 mV in alkaline solution for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. Moreover, it also exhibits the remarkable catalytic performance in alkaline seawater, with HER and OER overpotentials as low as 98 and 267 mV at 10 mA cm<sup>-2</sup>. Additionally, the assembled electrolysis cell with Ni<sub>3</sub>S<sub>2</sub>@NiFe-TDC-60 as both electrodes was able to operate continuously for at least 100 h at 10 mA cm<sup>-2</sup> with the voltages of 1.55 and 1.67 V in 1.0 M KOH and alkaline seawater, respectively, which demonstrated the excellent long-term durability. The outstanding catalytic activity of catalysts is attributed to the synergistic interplay between the heterointerface engineering and nanoflower-like architecture, which significantly boosts the catalytic efficiency, electrical conductivity and electron transfer kinetics. The paper offers innovative insights into rational engineering of MOF-derived bifunctional electrocatalysts through a rapid and facile synthetic strategy.</p>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"700 Pt 3","pages":"138647"},"PeriodicalIF":9.7,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144820186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kangmin Seo, Gahyeon Lee, Jihyun Ra, Hye Ri Kim, Sejin Im, Hyunseob Lim, Changhee Kim, Jong Hoon Joo
{"title":"Engineered surface oxidation of porous metal substrate for simultaneous enhancement of kinetics and durability in electrochemical hydrogen evolution reaction.","authors":"Kangmin Seo, Gahyeon Lee, Jihyun Ra, Hye Ri Kim, Sejin Im, Hyunseob Lim, Changhee Kim, Jong Hoon Joo","doi":"10.1016/j.jcis.2025.138624","DOIUrl":"10.1016/j.jcis.2025.138624","url":null,"abstract":"<p><p>This study presents an effective approach to enhancing the catalytic performance, long-term stability, and surface hydrophilicity of porous nickel (Ni) substrates for the hydrogen evolution reaction (HER) via controlled surface oxidation without additional catalysts. In this study, the Ni tape-cast substrate (Ni-TCS), fabricated through a tape-casting method followed by oxidation and reduction treatments, exhibited a large surface area and fine porosity, resulting in a significantly improved catalytic activity compared to conventional Ni foam. Through partial oxidation at temperatures ranging from 300 °C to 450 °C, a catalytically favorable nickel oxide (NiO) nano layer was produced directly on the Ni-TCS surface, enhancing the HER activity and stabilizing the NiO/Ni interface for durability. Additionally, the NiO nano layer rendered the electrode surface hydrophilic as confirmed through contact angle measurements, facilitating effective electrolyte contact and improving mass transport. The Ni-TCS electrode oxidized at 400 °C (Ni-TCS400) demonstrated the highest HER activity, sustaining excellent stability at 500 mA cm<sup>-2</sup> over 500 h. Ni-TCS400 exhibited lower kinetic and mass-transfer overpotentials than those of the Ni-TCS in an alkaline water electrolyzer (AWE) system, while a voltage of 1.81 V was required to achieve a current density of 0.4 A cm<sup>-2</sup>. Overall, the partial oxidation strategy circumvents the use of binders or precursors, while enabling improved stability, simplified fabrication, and high catalytic activity, making it a promising approach for the development of durable, efficient AWE electrodes.</p>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"700 Pt 3","pages":"138624"},"PeriodicalIF":9.7,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144797783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Chao Duan, Mu Wang, Ahmad Ghobadi, David M Eike, Rui Wang
{"title":"Quantifying the critical micelle concentration of nonionic and ionic surfactants by self-consistent field theory.","authors":"Chao Duan, Mu Wang, Ahmad Ghobadi, David M Eike, Rui Wang","doi":"10.1016/j.jcis.2025.138592","DOIUrl":"10.1016/j.jcis.2025.138592","url":null,"abstract":"<p><strong>Hypothesis: </strong>Quantifying the critical micelle concentration (CMC) and understanding its relationship with both the intrinsic molecular structures and environmental conditions remains a great challenge because 1) models need to reflect detailed molecular structures and chemistry-specific interactions and 2) long-range electrostatic interactions need to be accurately treated to model ionic surfactants and capture their responses to a variety of salt effects. We propose to solve these challenges by developing a self-consistent field theory (SCFT) which is applicable to both nonionic and ionic surfactants. We perform calculations for the structure and free energy of individual micelles in a subvolume, where this information is then incorporated into the dilute solution thermodynamics for the study of CMC, micellar structure, and the kinetic pathway of micellization. The long-range electrostatic interactions are decoupled from the short-range van der Waals interactions and are explicitly treated in our theory. This enables us to study a variety of salt effects such as counterion binding, salt concentration dependence, and the specific ion effect.</p><p><strong>Theoretical calculations: </strong>We apply the theory to three types of commonly used surfactants: alkyl poly(oxyethylene) ether (C<sub>m</sub>E<sub>n</sub>), sodium dodecylsulfate (SDS), and sodium poly(oxyethylene) dodecylsulfate (SLES). We investigate the dependence of the micellar structure and CMC on both the intrinsic structure of the surfactants and the external salt effects such as the salt concentration and the specific-ion effect. We compare CMC predicted by our theory with experimental measurements reported in the literature.</p><p><strong>Findings: </strong>For alkyl poly(oxyethylene) ether (C<sub>m</sub>E<sub>n</sub>) surfactants, we predict a wide range of CMC from 10<sup>-6</sup> to 10<sup>-2</sup>M as the composition parameters m and n are adjusted. For the ionic sodium dodecylsulfate (SDS) surfactant, we show a decrease of the CMC as the salt concentration increases and capture both the specific cation effect and the specific anion effect. Furthermore, for sodium poly(oxyethylene) dodecylsulfate (SLES) surfactants, we find a non-monotonic dependence of both the CMC and micelle size on the number of oxyethylene groups. Our theoretical predictions of CMC are in quantitative agreement with experimental data reported in the literature for all three types of surfactants, demonstrating the effectiveness and versatility of our theory.</p>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"700 Pt 3","pages":"138592"},"PeriodicalIF":9.7,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144803097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Junning Qian, Dian Yang, Yuting Jiang, Wei Liu, Xueyan Hou, Le Shi, Lin Zeng
{"title":"Dual-engineering of sulfur, oxygen co-doping and defective carbon structure boosts highly efficient hydrogen peroxide electrosynthesis.","authors":"Junning Qian, Dian Yang, Yuting Jiang, Wei Liu, Xueyan Hou, Le Shi, Lin Zeng","doi":"10.1016/j.jcis.2025.138621","DOIUrl":"10.1016/j.jcis.2025.138621","url":null,"abstract":"<p><p>Utilizing the two-electron oxygen reduction reaction (2e<sup>-</sup> ORR) for green hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) production offers a sustainable alternative to the traditional anthraquinone process. Metal-free carbon electrocatalysts have attracted significant attention due to their low cost and structural diversity. However, their advancement in 2e<sup>-</sup> ORR has been severely hampered by the inefficient bulk production of H<sub>2</sub>O<sub>2</sub>. In this study, we report a dual-engineering strategy for enhancing H<sub>2</sub>O<sub>2</sub> electroproduction by constructing a sulfur and oxygen (S, O) co-doped defective carbon electrocatalyst (HP-ACB). This HP-ACB electrocatalyst achieves a remarkable H<sub>2</sub>O<sub>2</sub> kinetic current density of 184.3 A g<sup>-1</sup>, a high Faradaic efficiency of 94 %, and enhanced H<sub>2</sub>O<sub>2</sub> production reaching 8.21 mol g<sub>cat</sub><sup>-1</sup> h<sup>-1</sup>. Experimental results with theoretical calculations demonstrate that the excellent electrocatalytic performance of HP-ACB in 2e<sup>-</sup> ORR is attributed to the introduction of S, O atoms and defective carbon, which synergistically reduce the overpotential required for the adsorption of the key intermediate (OOH<sup>⁎</sup>) on catalyst surface in 2e<sup>-</sup> ORR. This research not only proposes a viable approach to enhancing the 2e<sup>-</sup> ORR electrocatalytic activity of metal-free carbon materials but also highlights the importance of regulating the electronic structure of defective carbon in catalytic applications.</p>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"700 Pt 3","pages":"138621"},"PeriodicalIF":9.7,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144815489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Architectural modulation of binary metal-organic frameworks upcycled from waste polyethylene terephthalate for high-performance supercapacitors.","authors":"Yunxing Zhao, Denian Li, Pengcheng Cai, Xuanyuan Ni, Guanghao Chen, Dongsheng Xia, Zixu Sun, Haoran Yuan","doi":"10.1016/j.jcis.2025.138666","DOIUrl":"10.1016/j.jcis.2025.138666","url":null,"abstract":"<p><p>The widespread and uncontrolled disposal of polyethylene terephthalate (PET) plastics poses a significant environmental challenge. In this study, we propose a sustainable upcycling strategy to convert waste PET into high-value bimetallic nickel/cobalt-1,4-benzenedicarboxylate metal-organic frameworks (NiCo-BDC MOFs) via a one-pot solvothermal method. By tuning the Ni/Co precursor ratio, the morphology of the resulting NiCo-BDC transitions controllably from stacked nanowires to nanorods, forming a hybrid crystalline-amorphous architecture with a large specific surface area and well-developed hierarchical porosity. Among the synthesized materials, Ni<sub>1.5</sub>Co<sub>0.5</sub>-BDC exhibits outstanding electrochemical performance, delivering a specific capacitance of 949 F g<sup>-1</sup> at 2 A g<sup>-1</sup> and maintaining 820 F g<sup>-1</sup> at 20 A g<sup>-1</sup>. When assembled into an asymmetric supercapacitor with biomass-derived nano‑carbon, the device achieves an energy density of 22 Wh kg<sup>-1</sup> at a power density of 1613 W kg<sup>-1</sup>, with 83 % capacitance retention over 5000 cycles at 10 A g<sup>-1</sup>. Notably, this upcycling approach demonstrates broad adaptability to various types of PET waste, offering a versatile platform that integrates plastic valorization with the development of high-performance electrode materials for next-generation energy storage systems.</p>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"700 Pt 3","pages":"138666"},"PeriodicalIF":9.7,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144833658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Fluorination of Fe, Sn, N atoms doped carbon enables the balance of activity and stability for oxygen reduction.","authors":"Yimin Chen, Jiayi Niu, Chaozhong Guo, Chenyang Shu, Jianglin Chen, Jinyan Wu, Rong Jin, Yao Liu, Hao Wang, Yujun Si, Xiaoyu Dong","doi":"10.1016/j.jcis.2025.138619","DOIUrl":"10.1016/j.jcis.2025.138619","url":null,"abstract":"<p><p>The development of highly active and durable carbon-based electrocatalysts for the oxygen reduction reaction (ORR) is of critical importance. In this study, a heteroatom-doped carbon catalyst (FeSn-NFC) was synthesized through the chelation of Fe<sup>3+</sup> and dopamine hydrochloride, followed by Sn/F co-doping and carbonization. The resulting FeSn-NFC catalyst exhibits an ultrahigh specific surface area of 2387.9 m<sup>2</sup> g<sup>-1</sup>, with micropores accounting for 79 % of its structure. The incorporation of Sn enhances the pyridinic nitrogen content and facilitates the elimination of reactive oxygen species (ROS). Electrochemical evaluations reveal exceptional ORR performance, with a half-wave potential (E<sub>1/2</sub>) of 0.857 V and a minimal degradation (ΔE<sub>1/2</sub> = 11 mV) after accelerated aging tests. When integrated into a zinc-air battery, the FeSn-NFC catalyst delivers a peak power density of 217 mW cm<sup>-2</sup> and an energy density of 880 Wh kg<sup>-1</sup> (Zn), maintaining 93.2 % of its initial energy density after ∼115 h of continuous operation. This work offers a novel strategy for fabricating efficient, stable, and cost-effective ORR electrocatalysts, advancing the field of energy conversion technologies.</p>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"700 Pt 3","pages":"138619"},"PeriodicalIF":9.7,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144797784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Penghui Yang, Jiaqi Yang, Xinyu Zen, Yuyang Gong, Junbo Zhong
{"title":"Construction of S-scheme Sb<sub>2</sub>O<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub> heterojunctions for photocatalytic CO<sub>2</sub> and Cr(VI) reduction.","authors":"Penghui Yang, Jiaqi Yang, Xinyu Zen, Yuyang Gong, Junbo Zhong","doi":"10.1016/j.jcis.2025.138648","DOIUrl":"10.1016/j.jcis.2025.138648","url":null,"abstract":"<p><p>Photocatalytic CO<sub>2</sub> reduction is a promising strategy to address excessive CO<sub>2</sub> emissions. g-C<sub>3</sub>N<sub>4</sub> photocatalyst has attracted widespread attention due to its appropriate bandgap and low toxicity. However, the rapid recombination of electron-hole pairs and the limited number of active sites severely restrict its practical application. In this study, we reported S-scheme Sb<sub>2</sub>O<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub> heterojunctions. Introducing Sb<sub>2</sub>O<sub>3</sub> onto g-C<sub>3</sub>N<sub>4</sub> enhances active sites and adsorption capacity, and improves photogenerated carriers separation efficiency via heterojunction formation. Under simulated solar light irradiation, the Sb<sub>2</sub>O<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub> heterojunctions exhibits superior photocatalytic CO<sub>2</sub> reduction performance relative to the reference Sb<sub>2</sub>O<sub>3</sub> and g-C<sub>3</sub>N<sub>4</sub>. In-situ X-ray photoelectron spectroscopy (In-situ XPS), surface photovoltage spectroscopy (SPS), electron paramagnetic resonance (EPR) and ultraviolet photoelectron spectroscopy (UPS) further reveal the electron transfer mechanism in heterojunctions. In-situ diffuse reflectance Fourier transform infrared (DRIFTS) spectroscopy provides insight into the dynamic behavior of CO<sub>2</sub> into CO and CH<sub>4</sub>. This work offers a feasible strategy for developing high-performance g-C<sub>3</sub>N<sub>4</sub> photocatalysts to address environmental challenges.</p>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"700 Pt 3","pages":"138648"},"PeriodicalIF":9.7,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144811471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Revealing the dynamic arrangement mechanism of SiCw under combined AC-DC electric fields for composite performance enhancement: Modeling, analysis, and experiments.","authors":"Huanmin Yao, Haibao Mu, Maoqun Shen, Wenrui Tian, Wendong Li, Daning Zhang, Haoxiang Zhao, Andrea Cavallini, Guanjun Zhang","doi":"10.1016/j.jcis.2025.138632","DOIUrl":"10.1016/j.jcis.2025.138632","url":null,"abstract":"<p><p>Employing electric fields to induce directional arrangement of one-dimensional nanofillers within specific regions is a powerful strategy for enhancing the performance of composites. However, conventional single-mode electric fields (AC or DC) exhibit inherent \"orientation-distribution\" contradiction. Specifically, AC fields are effective for orientation but lack spatial control, while DC fields promote filler enrichment but fail to optimize orientation state. This study presents an innovative approach by establishing a theoretical framework that integrates both AC and DC electric fields along with a corresponding microscale dynamic model. This approach enables the precise and flexible manipulation of complex filler arrangements, thereby expanding opportunities for advanced material design. The model refines classical dielectrophoresis theory, incorporating interfacial charge and local electric field effects, elucidating the dynamic mechanisms of fillers under combined AC-DC electric fields. Numerical simulations reveal that AC fields primarily control orientation through dielectrophoresis, while DC fields regulate spatial distribution via electrophoresis. The synergistic combination of these two electric fields yields a pronounced \"orientation-enrichment\" effect, enabling the controlled and orderly arrangement of fillers within targeted areas. Moreover, high-aspect-ratio fillers promote chain formation but restrict rotation and migration, and frequencies above 1 kHz suppress alignment and interparticle attraction. Preliminary material design and preparation for enhanced electrical properties of renewable energy transmission device further indicate that this method is effective and flexible for complex application scenarios. This work advances our understanding of complex filler behavior in hybrid electric fields and offers a novel strategy for designing high-performance composites, paving the way for future innovations in material design.</p>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"700 Pt 3","pages":"138632"},"PeriodicalIF":9.7,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144820187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Katie Kriegler Foster, Anil Pooran, Marthinus van der Merwe, Sandra Castel, Anton Joubert, Edda Zangenberg, Keertan Dheda, Lubbe Wiesner
{"title":"Validation and clinical application of an LC-MS/MS method designed to simultaneously measure seven second-line TB drugs and two metabolites in human lung tissue.","authors":"Katie Kriegler Foster, Anil Pooran, Marthinus van der Merwe, Sandra Castel, Anton Joubert, Edda Zangenberg, Keertan Dheda, Lubbe Wiesner","doi":"10.1016/j.jpba.2025.117093","DOIUrl":"10.1016/j.jpba.2025.117093","url":null,"abstract":"<p><p>We developed and validated a novel bioanalytical method for the simultaneous quantification of levofloxacin, linezolid, moxifloxacin, delamanid, bedaquiline, clofazimine, and pretomanid, along with the metabolites of delamanid (DM-6705) and bedaquiline (N-desmethyl-bedaquiline, M2), in human lung tissue samples. Following homogenization by bead beating and extraction by protein precipitation, the analytes were separated on an Agilent 1260 Infinity II HPLC system using a Poroshell 120 C18 EC (2.1 mm×50 mm, 2.7 µm) column with gradient elution, applying a mobile phase consisting of 0.1 % formic acid in water and 0.1 % formic acid in a mixture of acetonitrile and methanol. Detection and quantification of the analytes and their stable isotope labelled internal standards were performed on a Sciex API 5500 QTrap mass spectrometer using positive electrospray ionization and multiple reaction monitoring. Validation according to the guidelines of the FDA and EMA proved the method to be precise, accurate, and robust with no significant influence of matrix components. The application of the method to the analysis of clinical samples demonstrated the feasibility of quantifying the second-line anti-tuberculosis drugs in human lung tissue and the potential to provide insights into the drug distribution across the infection sites in the lung.</p>","PeriodicalId":16685,"journal":{"name":"Journal of pharmaceutical and biomedical analysis","volume":"266 ","pages":"117093"},"PeriodicalIF":3.1,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144812162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The single-particle dynamics of square platelets on an inner spherical surface.","authors":"Yue Shi, Fuzhou Liu, Yanran Li, Jianan Zhu, Mingcheng Yang, Kun Zhao, Yiwu Zong","doi":"10.1016/j.jcis.2025.138513","DOIUrl":"10.1016/j.jcis.2025.138513","url":null,"abstract":"<p><strong>Hypothesis: </strong>The diffusion of colloidal particles on curved surfaces is crucial for understanding mass transport in a wide range of biological and physical systems. To date, most experimental studies on colloid diffusion on curved surfaces have focused on the behavior of isotropic colloids diffusing on soft oil-water interfaces. However, there has been no experimental work reported on how anisotropic colloids diffuse on hard spherical surfaces.</p><p><strong>Experiments: </strong>Herein, we report a first experimental study of the single-particle dynamics of micro-sized Brownian square platelets on solid spherical surfaces with four different curvatures. Utilizing video microscopy and particle-tracking techniques, we investigated both the translational and rotational motion of the square platelets. An analytical model based on Smoluchowski equations was developed to explain the observed diffusion behaviors.</p><p><strong>Findings: </strong>The translational motion of the square platelets was found to be sub-diffusive at time scales comparable to their relaxation time, with the power-law exponent of the mean square displacement (MSD) decreasing as the curvature increased. In contrast, the rotational diffusion of the platelets exhibited minimal variation with changes in curvature. The developed analytical model based on Smoluchowski equations could explain the observations in both translational and rotational diffusion, highlighting the crucial role of surface geometry in determining the diffusion dynamics. This research provides new insights into the diffusion of anisotropic particles on hard spherical curved surfaces, which will pave the way for understanding mass transport problems on curved surfaces in various fields.</p>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"700 Pt 3","pages":"138513"},"PeriodicalIF":9.7,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144803098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}