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

{"title":"Membrane-free two-step water splitting enabled by heterostructured Ni(OH)2-CoMoO4·0.75H2O charge-buffering electrode","authors":"Chaonan Lv ,&nbsp;Yan Liu ,&nbsp;Xiaowei Li ,&nbsp;Lina Jin ,&nbsp;Xiayu Li ,&nbsp;Weihang Xu ,&nbsp;Lei Zhang","doi":"10.1016/j.colsurfa.2025.136718","DOIUrl":"10.1016/j.colsurfa.2025.136718","url":null,"abstract":"<div><div>Membrane-free, decoupled water splitting is essential for cost-effective, large-scale hydrogen production but is hindered by challenges such as limited charge storage capacity and slow charge transfer during electrochemical reactions. Herein, we introduced a facile heterostructure engineering approach to synthesize Ni(OH)₂@CoMoO₄·0.75H₂O nanosheets on nickel foam as a highly efficient charge-buffering electrode. This design effectively decoupled the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), enabling continuous hydrogen production at the cathode for 1500 seconds under 8.33 mA/cm² with a driving potential of 1.55 V. Simultaneously, the anode underwent oxidation to produce an oxidized mediator, which triggered O₂ generation in the second OER step at 0.49 V, ensuring that the oxygen production time matched the duration of HER. Notably, pairing this oxidized mediator with zinc foil eliminated the need for a second OER stage, allowing sustained hydrogen production without external power. Raman spectroscopy revealed the oxidation-reduction pathways of the buffering electrode during cycling, while work function analysis showed that the heterostructure induced charge redistribution and formed an interfacial electric field, boosting electron transport, affording rich active sites, and reducing ion diffusion barriers. By spatially and temporally decoupling HER and OER, this approach offers a scalable solution for renewable hydrogen production.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"716 ","pages":"Article 136718"},"PeriodicalIF":4.9,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714711","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":"Versatile droplet production: A cost-effective, modular approach via integration of commercial micro-tubing and 3D-printed microchannels","authors":"Yimin Cheng ,&nbsp;Zhaoyue Liu ,&nbsp;Fengwei Tang ,&nbsp;Wenxin Zhang ,&nbsp;Zhengyuan Zhou ,&nbsp;Woda Shi ,&nbsp;Jia Ming Zhang ,&nbsp;Jianxiang Song","doi":"10.1016/j.colsurfa.2025.136625","DOIUrl":"10.1016/j.colsurfa.2025.136625","url":null,"abstract":"<div><div>3D printing has emerged as a transformative fabrication methodology for microfluidic chip development, yet the limited manufacturing precision of low-cost desktop 3D-printed systems continues to constrain their widespread implementation and industrial scalability. To overcome these critical limitations, we present an innovative modular microfluidic platform that achieves economical production of monodisperse single emulsion droplets with 50 μm diameters. Our breakthrough design synergistically combines commercially available microtubing with optimized 3D-printed microarchitectures, enabling both precise component alignment and simplified assembly processes. The strategic implementation of commercial microtubing as core droplet generation and collection elements circumvents conventional channel dimension restrictions inherent to desktop 3D-printing, thereby facilitating generation of substantially smaller droplets through modular chip configurations. This adaptable architecture permits dual modulation of emulsion characteristics through both replaceable tubing components and tunable printed structural parameters, effectively expanding the operational range of producible droplet sizes while redefining modular microfluidic design paradigms. Notably, the system demonstrates exceptional scalability through seamless transition to double emulsion production with precisely controllable encapsulated droplet quantities. Constructed from universally accessible components with standardized interfaces, our platform offers significant advantages in cost efficiency maintenance simplicity, and operational reliability. The intuitive modular configuration empowers researchers across disciplines to conduct advanced droplet microfluidics experiments without specialized training. This technological advancement establishes a new benchmark for affordable, user-adaptive microfluidic systems with broad droplet-related applications spanning pharmaceutical development, biomedical diagnostics, and materials engineering.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"716 ","pages":"Article 136625"},"PeriodicalIF":4.9,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714713","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":"First-principles modeling and optimization of the dip-coating process for starch-glycerol edible films using viscosity measurements","authors":"Amanda Grazi,&nbsp;Amanda Nascimento,&nbsp;Renata Almeida,&nbsp;Maria Eduarda Costa,&nbsp;Severina Sousa,&nbsp;Hugo M. Lisboa","doi":"10.1016/j.colsurfa.2025.136712","DOIUrl":"10.1016/j.colsurfa.2025.136712","url":null,"abstract":"<div><div>This current study presents a first-principles approach for modeling and optimizing the dip-coating of starch–glycerol edible films via simple viscosity measurements. Eleven formulations were prepared and characterized at 40°C using a Brookfield viscometer to capture their shear-thinning and yield-stress behavior. The Herschel–Bulkley and Cross models were then used to predict key coating parameters, including film thickness, shrinkage, and adhesion. Strong agreement between theoretical predictions and experimental data (R² &gt; 0.94) confirmed the models’ reliability. Wet film thickness ranged from 0.78 mm to 1.95 mm, dry thickness from 0.12 mm to 0.55 mm, shrinkage from 70.9 % to 88.2 %, and adhesion from 0.0195 N to 3.25 N. These results reveal the interplay of starch content (enhancing structural stability) and glycerol concentration (improving flexibility), enabling the design of films with tailored mechanical and barrier properties. Overall, this streamlined, mechanistic framework significantly reduces the need for extensive empirical trials and offers a scalable route to developing high-performance, biodegradable packaging.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"716 ","pages":"Article 136712"},"PeriodicalIF":4.9,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715239","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":"Exploring adsorption behaviors of NO, NH3, SO2, CO2, C7H8 from flue gases on X-zeolite derived from coal fly ash: Experimental and micro-calculation","authors":"Ruijia Dai ,&nbsp;Yongqi Zhao ,&nbsp;Qingchun Zhai ,&nbsp;Shaoyu Wang ,&nbsp;Hua Li ,&nbsp;Xingxing Chen ,&nbsp;Jianglong Yu ,&nbsp;Jinxiao Dou","doi":"10.1016/j.colsurfa.2025.136716","DOIUrl":"10.1016/j.colsurfa.2025.136716","url":null,"abstract":"<div><div>Coal-fired power plants generate substantial quantities of hazardous fly ash and gas pollutants, presenting significant environmental challenges. This study introduces an innovative approach to simultaneously address both waste streams by converting coal fly ash (CFA) into high-performance X zeolite adsorbents. The synthesized X zeolite showed exceptional surface area and well-defined crystalline structure, as confirmed by comprehensive characterization using SEM, XRD, FT-IR, BET, Raman, and TPD analyses. The adsorption performance of the synthesized X zeolite was systematically evaluated using low-concentration (1000 ppm) flue gas components including NH₃, NO, SO₂, CO₂, and C₇H₈ across operating temperatures of 20–100 ℃. Maximum adsorption capacities at 20 ℃ reached 1.58, 0.38, 1.16, 0.71, and 0.65 mmol/g for NH₃, NO, SO₂, CO₂, and C₇H₈ respectively, with NH₃ and SO₂ showing notably higher affinities. The selective adsorption behavior stems from strong interactions between polar gas molecules and the zeolite framework under combined dispersion and electrostatic forces. In-situ DRIFTs analysis coupled with DFT calculations revealed that bridging oxygen atoms (T-O-T) within the zeolite structure serve as primary adsorption sites, facilitating electron transfer with gas molecules. These findings demonstrate the potential of CFA-derived X zeolite for efficient multi-pollutant removal from flue gases while simultaneously addressing solid waste management in coal-fired power plants.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"716 ","pages":"Article 136716"},"PeriodicalIF":4.9,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697293","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":"Effect of acetic acid and CO2 on coal molecular structure and oxygen adsorption","authors":"Junhong Si ,&nbsp;Ziming Fan ,&nbsp;Lin Li ,&nbsp;Xuewei Yang ,&nbsp;Xiaojie Guo","doi":"10.1016/j.colsurfa.2025.136731","DOIUrl":"10.1016/j.colsurfa.2025.136731","url":null,"abstract":"<div><div>Adsorption oxygen inhibition is one of the main mechanisms in the CO₂ prevention of coal spontaneous combustion technology in goaf. Acidic solvent extraction technology can affect the adsorption properties of coal. However, there is a lack of research on the adsorption oxygen inhibition mechanism under the interaction of acetic acid and CO₂. Therefore, a series of coal extractions were conducted using acetic acid solvents with concentrations ranging from 0 % to 90 %. Elemental analysis, FT-IR, XPS, and ¹³C NMR experimental methods were employed to construct a molecular structure model of the coal. The reliability of the model was verified through isothermal adsorption simulation experiments and molecular simulation techniques. The effects of acetic acid on the microscopic structure of coal were discussed by comparing the raw coal and extracted coal. Furthermore, the adsorption behavior of coal towards O₂ under the effect of acetic acid and CO₂ at different temperatures and pressures was explored, leading to the identification of the optimal range of acetic acid concentrations. The research results indicate that acetic acid has a minimal impact on the aromatic macromolecular structure of coal. The coal molecules primarily consist of tri-substituted and tetra-substituted benzene rings, while aliphatic carbon structures are predominantly methylene and methyl groups. The nitrogen content mainly exists in the forms of pyridinic nitrogen and pyrrolic nitrogen, whereas oxygen is present in three forms: C–O, C<img>O, and –COOH, with the highest content being C<img>O. The molecular formulas of coal at acetic acid concentrations of 0–90 % are C₁₅₁H₁₀₆N₂O₂₅, C₁₅₁H₁₁₀N₂O₂₀, C₁₅₁H₁₀₈N₂O₂₁, and C₁₅₁H₁₁₂N₂O₁₉, denoted as KZ0, KZ30, KZ60, and KZ90, respectively. At different acetic acid concentrations, the adsorption of oxygen by coal is primarily dominated by alkyl ether and carboxyl groups, while the larger the free space volume of the coal sample, the more favorable it is for O₂ adsorption. The relationship between coal adsorption of oxygen under the action of acetic acid and CO₂ is as follows: KZ90 +CO₂ &gt; KZ0 +CO₂ &gt; KZ30 +CO₂ = KZ60 +CO₂, indicating that when the acetic acid concentration is 30 % and 60 %, the oxygen expulsion effect of coal on CO₂ is stronger. Based on the interaction energy and adsorption capacity, the optimal acetic acid concentration range is determined to be (30 %, 60 %]. For practical applications, a mobile downhole injection process was selected considering cost and safety factors. The findings contribute to enhancing the inerting effect in mined-out areas.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"716 ","pages":"Article 136731"},"PeriodicalIF":4.9,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715247","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":"In-situ growth of covalent triazine frameworks on ZIF8 for enhanced adsorption of fluoroquinolones in milk","authors":"Juan Zhang,&nbsp;Furong Tang,&nbsp;Ting Zou,&nbsp;Jinyi Chen","doi":"10.1016/j.colsurfa.2025.136632","DOIUrl":"10.1016/j.colsurfa.2025.136632","url":null,"abstract":"<div><div>A novel composite based on in-situ grown covalent triazine frameworks (CTFs) on ZIF8 was designed and synthesized for application in dispersive solid-phase extraction (DSPE), aiming at the selective extraction of fluoroquinolones (FQs). The ZIF8@CTFs composite were constructed through specific organic ligands, exhibiting exceptional adsorption affinity towards the target analytes. Their unique structural properties, particularly the synergistic effect between ZIF8 and CTFs, provided abundant active sites, thereby enhancing the selectivity and adsorption capacity of the composite. Competitive adsorption experiments and mechanistic studies validated the efficient capture capability of ZIF8@CTFs towards the target FQs. Under optimized conditions, a sensitive analytical method was established by integrating DSPE using ZIF8@CTFs with high-performance liquid chromatography (HPLC), enabling quantitative analysis of multiple target analytes in milk samples. This method demonstrated a wide linear range, high precision, and LODs as low as 0.0025 μg mL⁻¹. The recovery rates ranged from 95.3 % to 102.6 %, with RSD below 5.1 % at various spiked concentrations, indicating the promising application potential of this approach for the detection of target analytes in milk samples.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"716 ","pages":"Article 136632"},"PeriodicalIF":4.9,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725028","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":"Selective separation characteristics of new collector dodecyl dihydroxyethyl methyl ammonium chloride on lepidolite-quartz","authors":"Mengfei Feng ,&nbsp;Haiyun Xie ,&nbsp;Peilun Shen ,&nbsp;Xinyi Zhang ,&nbsp;Yanling Jin ,&nbsp;Jianjuan Li ,&nbsp;Tuyue Guo ,&nbsp;Dianwen LIU","doi":"10.1016/j.colsurfa.2025.136698","DOIUrl":"10.1016/j.colsurfa.2025.136698","url":null,"abstract":"<div><div>Lepidolite is one of the main minerals used to extract lithium metal. The efficient flotation separation of lepidolite and quartz has always been a difficult and research hotspot in mineral processing. In this paper, a new cationic collector dodecyl dihydroxyethyl methyl ammonium chloride (2HEAC-12) was innovatively employed to achieve efficient selective separation of lepidolite and quartz. The micro-flotation test was used to investigate the effect of 2HEAC-12 on the flotation separation efficiency of lepidolite and quartz, the contact angle and zeta potential measurement, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis were used to investigate the mechanism of action of 2HEAC-12 on lepidolite and quartz surfaces. The results of micro-flotation test showed that when pH= 3 and the dosage of 2HEAC-12 was 40 mg/L, the flotability difference between lepidolite and quartz was very significant, and lepidolite has good flotability while quartz has weak flotability, so that efficient flotation separation of them could be realized. The results of contact angle tests showed that the surface contact angle of lepidolite increased from 25.62° to 79.56° after 2HEAC-12 treatment, which further confirmed the results of micro-flotation test. The zeta potential test showed that the surface potential of lepidolite is more negative than that of quartz, which is more conducive to the selective adsorption of lepidolite by cationic collector 2HEAC-12. FTIR detection showed that 2HEAC-12 acts on the surface of lepidolite through hydrogen bonding and physical adsorption. XPS analysis further revealed that 2HEAC-12 was adsorbed on the Al-O and Si-O^- sites on the surface of lepidolite through the form of protonated nitrogen (i.e., -N⁺-, -N-). On the contrary, 2HEAC-12 has almost no interaction with quartz, so 2HEAC-12 selectively collected lepidolite. The new 2HEAC-12 collector has higher selectivity than traditional amine collectors in the separation and enrichment of lepidolite ore and has potential industrial application value in the development of lepidolite resources.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"716 ","pages":"Article 136698"},"PeriodicalIF":4.9,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715244","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":"Human physiological motion detection by a blend of polyaniline-polyvinyl alcohol semi-conductive ink deposited on flexible cellulose substrate","authors":"Jayanta Das,&nbsp;Debadrita Dasgupta,&nbsp;Biswajit Saha","doi":"10.1016/j.colsurfa.2025.136697","DOIUrl":"10.1016/j.colsurfa.2025.136697","url":null,"abstract":"<div><div>Polyaniline-polyvinyl alcohol (PANI-PVA) semiconducting ink systems have been developed and reported in this article. First, polyaniline in its emeraldine salt form was synthesized by the in-situ polymerization method and then the polyaniline (PANI) powder was mixed with polyvinyl alcohol (PVA) until the formation of a viscous homogenous solution. Both the prepared ink systems were found to be crystalline as well as microporous as revealed by X-ray diffraction measurements and SEM micrographs respectively. The XRD reveals an extremely intense peak at 2θ= 22.5° is caused by reflections from the (020) Miller plane of PANI. UV–vis–NIR spectroscopy measurements reveal their energy bands at 315 and 610 nm. This work reports on the resistive response of the PANI-PVA semiconducting ink systems deposited on flexible cellulose substrate under various stresses and strains developed in the human body due to its movement. The changing stress and strain field affects the polaron hopping barrier and as a result, the effective conductivity of the inks is adjusted. The stress and strain field developed due to various physiological movements is thus accountable for the observed variation in electrical properties. The experimental findings demonstrate that the proposed flexible, high-endurance polymeric systems can be a promising candidate for wearable electronics and real-time monitoring of human physiological motions. A relative pressure sensitivity of 3.16 × 10⁻³ Torr⁻¹ has been obtained for PANI-PVA ink in the pressure range of 750–970.05 Torr. Under a 750–823.50 Torr pressure range, PANI ink showed response and recovery times of 0.321 and 0.132 seconds, respectively, compared to 0.278 and 0.252 seconds for the PANI-PVA ink system.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"716 ","pages":"Article 136697"},"PeriodicalIF":4.9,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725125","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":"Melamine-assisted hierarchical nitrogen-doped biochar from garlic peel hydrochar as efficient adsorbent for tetracycline removal","authors":"Dongchenyi Wang ,&nbsp;Laiying Zhu ,&nbsp;Xiao Liu ,&nbsp;Zihan Zeng ,&nbsp;Shenli Liu ,&nbsp;Jinjun Cai","doi":"10.1016/j.colsurfa.2025.136726","DOIUrl":"10.1016/j.colsurfa.2025.136726","url":null,"abstract":"<div><div>The acumulation of antibiotics in water shows high risk towards human health, and it is important to form hierarchical porous biochar with prominent superiority in mass transfer to improve removal ability. Here, garlic peel as biowaste was converted into mesoporous biochar under the assistance of melamine, showing surface areas of 3011 m²/g with main mesopores at around 2.4 nm and acting as useful adsorbent for tetracycline (TC) removal. The important variables including initial concentration, contact time and co-existing ions are studied in detail, and adsorption behavior is better described by pseudo-second-order and Langmuir model with spontaneous endothermic process. Significantly, the maximum TC capacity is up to be 1304.5 mg/g, much larger than most type of adsorbents with close surface areas due to synergetic effect of pore-filling, H-bonding and π-π static interaction. This work highlights a useful guidance to design hierarchically porous biochar for the effectively TC removal from aquatic environment.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"716 ","pages":"Article 136726"},"PeriodicalIF":4.9,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684973","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":"Porous ionic copolymer-functionalized magnetic diatomite as a superior catalyst toward regioselective synthesis of pyridopyrimidines","authors":"Sara Shafaati ,&nbsp;Javad Safaei-Ghomi ,&nbsp;Zahra Elyasi","doi":"10.1016/j.colsurfa.2025.136695","DOIUrl":"10.1016/j.colsurfa.2025.136695","url":null,"abstract":"<div><div>Although the modification of diatomite, a silica support derived from natural minerals, with various (carbohydrate) polymers has been reported, its functionalization with an imidazolium-based ionic polymer remains unexplored. Accordingly, a magnetic diatomite (Dt@CoFe₂O₄) was surface-reconstructed and functionalized with an ionic imidazole-epichlorohydrin copolymer ([IMEP][Cl]). The Dt@CoFe₂O₄/[IMEP][Cl] was obtained through a straightforward two-step sequence involving co-precipitation and chemical polymerization. The ionic copolymer enhances the charge density, surface area, and variety of functional groups on magnetic diatomite, while the inorganic component provides high chemical and thermal stability. As a result, the proposed Dt@CoFe₂O₄/[IMEP][Cl] composite exhibits key characteristics of an efficient nanocatalyst, including good thermal stability (60 % weight loss up to 800°C), a significant specific surface area (218.3 m²/g), and strong reusability over seven cycles. For the first time, the use of a diatomite-based composite as a heterogeneous nanocatalyst in a regioselective multicomponent reaction is presented. The Dt@CoFe₂O₄/[IMEP][Cl] catalytic activity was evaluated in the regioselective preparation of pyridopyrimidine ring systems under ultrasound agitation. Based on the observed data, the proposed composite facilitates the rapid construction (in 5 min) of various biologically active pyridopyrimidines with excellent yields (93–98 %) in an aqueous medium. As a pioneering effort, the combination of magnetic diatomite and ionic polymers has led to the creation of an effective architecture that offers a wide range of applications across different technological fields.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"716 ","pages":"Article 136695"},"PeriodicalIF":4.9,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697451","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}