Colloids and Surfaces A: Physicochemical and Engineering Aspects最新文献_第2页

A multifunctional magnetic biochar composites for advanced magnetorheological fluid applications

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-02-06 DOI: 10.1016/j.colsurfa.2025.136346

Shixu Li, Hui Zhao, Pengpeng Bai, Yonggang Meng, Yu Tian

Magnetorheological fluid (MRF), a smart suspension that respond to external magnetic fields, exhibits potential in engineering fields but is limited by its low mechanical properties and insufficient wear resistance. In this study, a magnetic biochar composite material (NiFe₂O₄/biochar) was proposed to ameliorate the magneto-induced yield stress and tribologcial characteristic of MRF. The cooperativity between magnetism of nanoscale particle and lubrication of biochar helps to enhance the suspension stability, dynamic yield stress, and friction characteristics of MRF. A series of tests for MRF were used to verify the effectiveness of magnetic composite materials. Experimental results showed that the addition of 3 % NiFe₂O₄/biochar to the MRF significantly improved the dynamic yield stress by 26.13 % under a magnetic flux density of 400 mT. Furthermore, the composite material improved the anti-settling stability of the MRF, reducing the height of the supernatant by 31.64 % after 12 h. Tribological tests revealed that the composite material also enhanced wear resistance, as evidenced by a reduction in both the friction coefficient (from 0.251 to 0.241) and the wear scar diameter at a 3 % mass fraction. These findings suggest that NiFe₂O₄/biochar composite materials are an effective strategy for improving the performance of MRF, making it more suitable for diverse engineering applications, particularly in environments requiring enhanced stability and wear resistance.

{"title":"A multifunctional magnetic biochar composites for advanced magnetorheological fluid applications","authors":"Shixu Li, Hui Zhao, Pengpeng Bai, Yonggang Meng, Yu Tian","doi":"10.1016/j.colsurfa.2025.136346","DOIUrl":"10.1016/j.colsurfa.2025.136346","url":null,"abstract":"<div><div>Magnetorheological fluid (MRF), a smart suspension that respond to external magnetic fields, exhibits potential in engineering fields but is limited by its low mechanical properties and insufficient wear resistance. In this study, a magnetic biochar composite material (NiFe<sub>2</sub>O<sub>4</sub>/biochar) was proposed to ameliorate the magneto-induced yield stress and tribologcial characteristic of MRF. The cooperativity between magnetism of nanoscale particle and lubrication of biochar helps to enhance the suspension stability, dynamic yield stress, and friction characteristics of MRF. A series of tests for MRF were used to verify the effectiveness of magnetic composite materials. Experimental results showed that the addition of 3 % NiFe<sub>2</sub>O<sub>4</sub>/biochar to the MRF significantly improved the dynamic yield stress by 26.13 % under a magnetic flux density of 400 mT. Furthermore, the composite material improved the anti-settling stability of the MRF, reducing the height of the supernatant by 31.64 % after 12 h. Tribological tests revealed that the composite material also enhanced wear resistance, as evidenced by a reduction in both the friction coefficient (from 0.251 to 0.241) and the wear scar diameter at a 3 % mass fraction. These findings suggest that NiFe<sub>2</sub>O<sub>4</sub>/biochar composite materials are an effective strategy for improving the performance of MRF, making it more suitable for diverse engineering applications, particularly in environments requiring enhanced stability and wear resistance.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136346"},"PeriodicalIF":4.9,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349751","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

Tribological performances of polyurethane or phenol-formaldehyde resin solid self-lubricating composites doped with PTFE and Mg-Al LDH

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-02-06 DOI: 10.1016/j.colsurfa.2025.136363

Yunqi Cheng , Tiehong Guo , Xinyu Li , Xinyu Liu , Aoqi Su , Zhiwei Liu , Deng Pan , Tifeng Jiao

Frictional wear has always been one of the main causes of energy consumption and material loss, and self-lubrication is considered to be the most effective way to control or reduce frictional wear. However, with the increasing demand for lubrication performance in industrial production, traditional lubrication additives can no longer meet the demand. Polymers have low friction, self-lubricating properties, and therefore play a key role in a multitude of industries. Due to its low friction coefficient and self-lubricating performance, it can effectively reduce friction resistance and energy consumption under no or little lubrication conditions. This property makes the polymer perform well in environments where dry friction is required, especially for components like gears, bearings, and piston rings. Polytetrafluoroethylene (PTFE) and magnesium aluminum hydrotalcite (Mg-Al LDH) have better self-lubricating properties. In this study, polyurethane (PU) and phenol-formaldehyde resin (PF) were used as substrates, PTFE and various concentrations of Mg-Al LDH were doped to enhance the frictional properties and wear resistance of solid self-lubricating composites. The results indicate that PU-based self-lubricating composites with 1 wt% Mg-Al LDH exhibit optimal performance, achieving an average friction coefficient of 0.12358 and a wear loss of 0.00057 g. PF-based self-lubricating composites containing 2 wt% Mg-Al LDH demonstrate the best performance within their group, with an average friction coefficient of 0.14461 and a wear loss of 0.00183 g. These findings highlight the influence of Mg-Al LDH content on enhancing the frictional behavior and wear resistance of polymer composites.

{"title":"Tribological performances of polyurethane or phenol-formaldehyde resin solid self-lubricating composites doped with PTFE and Mg-Al LDH","authors":"Yunqi Cheng , Tiehong Guo , Xinyu Li , Xinyu Liu , Aoqi Su , Zhiwei Liu , Deng Pan , Tifeng Jiao","doi":"10.1016/j.colsurfa.2025.136363","DOIUrl":"10.1016/j.colsurfa.2025.136363","url":null,"abstract":"<div><div>Frictional wear has always been one of the main causes of energy consumption and material loss, and self-lubrication is considered to be the most effective way to control or reduce frictional wear. However, with the increasing demand for lubrication performance in industrial production, traditional lubrication additives can no longer meet the demand. Polymers have low friction, self-lubricating properties, and therefore play a key role in a multitude of industries. Due to its low friction coefficient and self-lubricating performance, it can effectively reduce friction resistance and energy consumption under no or little lubrication conditions. This property makes the polymer perform well in environments where dry friction is required, especially for components like gears, bearings, and piston rings. Polytetrafluoroethylene (PTFE) and magnesium aluminum hydrotalcite (Mg-Al LDH) have better self-lubricating properties. In this study, polyurethane (PU) and phenol-formaldehyde resin (PF) were used as substrates, PTFE and various concentrations of Mg-Al LDH were doped to enhance the frictional properties and wear resistance of solid self-lubricating composites. The results indicate that PU-based self-lubricating composites with 1 wt% Mg-Al LDH exhibit optimal performance, achieving an average friction coefficient of 0.12358 and a wear loss of 0.00057 g. PF-based self-lubricating composites containing 2 wt% Mg-Al LDH demonstrate the best performance within their group, with an average friction coefficient of 0.14461 and a wear loss of 0.00183 g. These findings highlight the influence of Mg-Al LDH content on enhancing the frictional behavior and wear resistance of polymer composites.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136363"},"PeriodicalIF":4.9,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143285844","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

Modified waste orange peels biomass residues for sustainable and promising As(V) removal: Insights into batch and column adsorption experiments and Box-behnken Design (BBD) analysis

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-02-05 DOI: 10.1016/j.colsurfa.2025.136352

Khurram Shehzad , Bushra Waheed , Aqdas Shehzad , Mukhtar Ahmad , Suci Meng , Junjie Jing , Min Chen , Meng Xie , Yuanguo Xu

One of the biggest health hazards of today’s age is contamination of water due to increasing exposure of arsenic (As(V)), a carcinogenic element having no colour, taste and odor upon dissolution in water. It is still an urgent and challenging task to remove As(V) from contaminated water with suitable adsorbents. In this study, waste orange peels (OP) biomass residues, which mainly consist of amide (NH), hydroxyl (OH) and carboxyl (COOH) surface functional groups, have been modified with iron (Fe) followed by calcination for promising As(V) adsorption from aqueous environment. The batch adsorption experimental results showed that synthesized composite (OP-Fe₂O₃-N₂) showed promising As(V) adsorption capacity of more than 92 % with initial As(V) concentration of 500 μg/L under neutral pH condition at room temperature due to its large surface area, higher porosity and increased number of active adsorption sites at its surface. Langmuir isotherms model and pseudo second order kinetics model with their higher R² indicated that As(V) adsorption process on OP-Fe₂O₃-N₂ was chemisorption on a homogeneous surface with monolayer uptake. Anti-interference to common co-existing ions, regeneration ability and treatment of real like As(V) contaminated water by OP-Fe₂O₃-N₂ was remarkable. In addition, Box Behnken Design (BBD) analysis was conducted for optimization of As(V) adsorption by the OP-Fe₂O₃-N₂. The dynamic As(V) biosorption in fixed bed column demonstrated that OP-Fe₂O₃-N₂ is also impressive in continuous mode. This study showed that after simple treatment of waste OP biomass residues, it can be used as promising adsorbents for As(V) removal from the aqueous solutions.

{"title":"Modified waste orange peels biomass residues for sustainable and promising As(V) removal: Insights into batch and column adsorption experiments and Box-behnken Design (BBD) analysis","authors":"Khurram Shehzad , Bushra Waheed , Aqdas Shehzad , Mukhtar Ahmad , Suci Meng , Junjie Jing , Min Chen , Meng Xie , Yuanguo Xu","doi":"10.1016/j.colsurfa.2025.136352","DOIUrl":"10.1016/j.colsurfa.2025.136352","url":null,"abstract":"<div><div>One of the biggest health hazards of today’s age is contamination of water due to increasing exposure of arsenic (As(V)), a carcinogenic element having no colour, taste and odor upon dissolution in water. It is still an urgent and challenging task to remove As(V) from contaminated water with suitable adsorbents. In this study, waste orange peels (OP) biomass residues, which mainly consist of amide (NH), hydroxyl (OH) and carboxyl (COOH) surface functional groups, have been modified with iron (Fe) followed by calcination for promising As(V) adsorption from aqueous environment. The batch adsorption experimental results showed that synthesized composite (OP-Fe<sub>2</sub>O<sub>3</sub>-N<sub>2</sub>) showed promising As(V) adsorption capacity of more than 92 % with initial As(V) concentration of 500 μg/L under neutral pH condition at room temperature due to its large surface area, higher porosity and increased number of active adsorption sites at its surface. Langmuir isotherms model and pseudo second order kinetics model with their higher R<sup>2</sup> indicated that As(V) adsorption process on OP-Fe<sub>2</sub>O<sub>3</sub>-N<sub>2</sub> was chemisorption on a homogeneous surface with monolayer uptake. Anti-interference to common co-existing ions, regeneration ability and treatment of real like As(V) contaminated water by OP-Fe<sub>2</sub>O<sub>3</sub>-N<sub>2</sub> was remarkable. In addition, Box Behnken Design (BBD) analysis was conducted for optimization of As(V) adsorption by the OP-Fe<sub>2</sub>O<sub>3</sub>-N<sub>2</sub>. The dynamic As(V) biosorption in fixed bed column demonstrated that OP-Fe<sub>2</sub>O<sub>3</sub>-N<sub>2</sub> is also impressive in continuous mode. This study showed that after simple treatment of waste OP biomass residues, it can be used as promising adsorbents for As(V) removal from the aqueous solutions.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136352"},"PeriodicalIF":4.9,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143219527","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

Nanofibrous, hierarchically porous aerogels templated from wide-adjustable gel emulsions stabilized by an ionomeric organogelator for removing oils from oil-water mixtures

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-02-05 DOI: 10.1016/j.colsurfa.2025.136365

Qin Yu , Yan Gao , Haiwen Mao , Chao Yin , Zhiteng Li , Haoguan Gui , Tao Zhang

High internal phase emulsion (HIPE)-templated aerogels and xerogels are promising for removing oils from oil-water-mixtures, but such emulsions usually exhibit quite low adjustability in the dispersed phase fraction and the stabilizer concentration. Herein, we report the fabrication of emulsion-templated aerogels from highly adjustable gel emulsions, both of water-in-oil and nonaqueous emulsions, with the dispersed phase fraction ranging from 5 % to 80 % and stabilizer concentration ranging from 0.3 % to 8 %, much higher adjustability than that of common HIPEs. Through simple direct drying, the gel emulsions turn into emulsion-templated aerogels with designable external shapes, low density, unique hierarchically porous structures (emulsion-templated voids, interconnecting pores depending on emulsion types, nanofibers on void walls) that are not common for emulsion-templated porous polymers, an moreover, the aerogels show enhanced hydrophobicity and oleophilicity. The hydrophobicity-oleophilicity and unique porous structures enable the aerogels suitable for removing oils oil-in-water emulsions that are usually impossible for common porous materials.

{"title":"Nanofibrous, hierarchically porous aerogels templated from wide-adjustable gel emulsions stabilized by an ionomeric organogelator for removing oils from oil-water mixtures","authors":"Qin Yu , Yan Gao , Haiwen Mao , Chao Yin , Zhiteng Li , Haoguan Gui , Tao Zhang","doi":"10.1016/j.colsurfa.2025.136365","DOIUrl":"10.1016/j.colsurfa.2025.136365","url":null,"abstract":"<div><div>High internal phase emulsion (HIPE)-templated aerogels and xerogels are promising for removing oils from oil-water-mixtures, but such emulsions usually exhibit quite low adjustability in the dispersed phase fraction and the stabilizer concentration. Herein, we report the fabrication of emulsion-templated aerogels from highly adjustable gel emulsions, both of water-in-oil and nonaqueous emulsions, with the dispersed phase fraction ranging from 5 % to 80 % and stabilizer concentration ranging from 0.3 % to 8 %, much higher adjustability than that of common HIPEs. Through simple direct drying, the gel emulsions turn into emulsion-templated aerogels with designable external shapes, low density, unique hierarchically porous structures (emulsion-templated voids, interconnecting pores depending on emulsion types, nanofibers on void walls) that are not common for emulsion-templated porous polymers, an moreover, the aerogels show enhanced hydrophobicity and oleophilicity. The hydrophobicity-oleophilicity and unique porous structures enable the aerogels suitable for removing oils oil-in-water emulsions that are usually impossible for common porous materials.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136365"},"PeriodicalIF":4.9,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143347850","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

3D surface characterization of polymer-oxide nanocomposite coating using nanoscale stereometric approach for enhanced functionality

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-02-05 DOI: 10.1016/j.colsurfa.2025.136360

Ştefan Ţălu , Niranjan Patra

This study investigates the influence of varying nanorods (NR) filler concentrations (0, 5, 10, 20, and 30 wt%) on the surface morphology of nanocomposite coating composed of a poly(methyl methacrylate) matrix containing elongated titania nanorods, applied via spin-coating. Detailed analyses of 3-D topographic AFM images, contour line plots, Abbott-Firestone curves, furrow depth, texture direction, power spectral density (PSD), and ISO 25178–2:2012 statistical surface parameters were conducted. Results revealed a significant increase in surface roughness and complexity with increasing NR content, peaking at 20 wt% (P20). P20 demonstrated the highest roughness, optimal texture alignment, and functional properties, while further increases in NR content (P30) led to surface smoothing due to filler agglomeration. These findings highlight the critical role of NR concentration in tailoring the surface properties of nanocomposite films for enhanced performance.

引用次数: 0

Study of the process of black TiO2 turning white and its molecular adsorption and photocatalytic behavior

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-02-05 DOI: 10.1016/j.colsurfa.2025.136356

Guancheng Wang, Shuqi Zu, Yixuan Qie, Dan Wang, Run Liu, Ziheng Li

Black titanium dioxide (TiO₂) with anatase structure was prepared in this paper. Surface oxygen molecule (O₂) adsorption and photocatalytic behavior during the conversion of black titanium dioxide to white were investigated using density functional theory (DFT) and electrochemical impedance spectroscopy (EIS) techniques. Theoretical simulations show that two O₂ molecules are chemically adsorbed on the black TiO₂ surface and one O₂ molecule is physically adsorbed after the transformation into white, which suggests that the defective state of the black TiO₂ is beneficial to the loading of O₂, a result that is confirmed by the EIS experimental data. Theoretical calculations show that the poor hydrophilicity of black TiO₂ at room temperature meant that rhodamine B (RhB) in water could not be transported closer to the crystal surface for redox reaction with adsorbed oxygen, and the photocatalytic degradation performance was reduced compared with that of white TiO₂. However, based on the advantages of high oxygen adsorption of black TiO₂ and high degradation of white TiO₂, the synergistic effect of the two will greatly enhance the photocatalytic efficiency. The experiments of photocatalytic degradation of RhB confirmed this result. Studying the adsorption behavior of gas molecules on the crystal plane is an important insight for the construction of more efficient photocatalytic degradation interfaces and optimization of the performance of gas sensors.

{"title":"Study of the process of black TiO2 turning white and its molecular adsorption and photocatalytic behavior","authors":"Guancheng Wang, Shuqi Zu, Yixuan Qie, Dan Wang, Run Liu, Ziheng Li","doi":"10.1016/j.colsurfa.2025.136356","DOIUrl":"10.1016/j.colsurfa.2025.136356","url":null,"abstract":"<div><div>Black titanium dioxide (TiO<sub>2</sub>) with anatase structure was prepared in this paper. Surface oxygen molecule (O<sub>2</sub>) adsorption and photocatalytic behavior during the conversion of black titanium dioxide to white were investigated using density functional theory (DFT) and electrochemical impedance spectroscopy (EIS) techniques. Theoretical simulations show that two O<sub>2</sub> molecules are chemically adsorbed on the black TiO<sub>2</sub> surface and one O<sub>2</sub> molecule is physically adsorbed after the transformation into white, which suggests that the defective state of the black TiO<sub>2</sub> is beneficial to the loading of O<sub>2</sub>, a result that is confirmed by the EIS experimental data. Theoretical calculations show that the poor hydrophilicity of black TiO<sub>2</sub> at room temperature meant that rhodamine B (RhB) in water could not be transported closer to the crystal surface for redox reaction with adsorbed oxygen, and the photocatalytic degradation performance was reduced compared with that of white TiO<sub>2</sub>. However, based on the advantages of high oxygen adsorption of black TiO<sub>2</sub> and high degradation of white TiO<sub>2</sub>, the synergistic effect of the two will greatly enhance the photocatalytic efficiency. The experiments of photocatalytic degradation of RhB confirmed this result. Studying the adsorption behavior of gas molecules on the crystal plane is an important insight for the construction of more efficient photocatalytic degradation interfaces and optimization of the performance of gas sensors.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136356"},"PeriodicalIF":4.9,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143347849","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

Enhancing drug delivery efficacy of antiretroviral drug Zalcitabine through silver/gold/platinum loaded silica nanocomposites: Surface modifications, molecular interactions, and computational insights.

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-02-05 DOI: 10.1016/j.colsurfa.2025.136366

G.F. Nivetha , M. Srinivasan , M. Mohan , K. Klinton Brito , B. Gokulapriya , M. Selvapandiyan , V. Vetrivelan , M. Prasath

This article delves into the existing challenges and possibilities associated with the utilization of metal loaded silica nanocomposites in drug delivery applications, specifically focusing on silver, gold, platinum. Zalcitabine (ZAL) exhibits an adsorption with selected metal loaded silica nanocomposites (M-SiO₂ where M=Ag, Au and Pt) primarily through the nitrogen atom in primary amine, a phenomenon that shows varying interaction energies corresponding to the chosen metals. The utilization of silica nanocomposites causes alterations in the energy levels of Frontier Molecular Orbitals (FMO) through adsorption processes, ultimately leading to enhancements in drug delivery mechanisms. Furthermore, studies involving Molecular Electrostatic Potential (MEP) insight on the reactivity patterns of these complexes. An additional technique, Surface Enhanced Raman Scattering (SERS) amplifying the Raman signals of biomolecules by employing nanosized metal substrates. Electron Localization Function (ELF) alongside Localized Orbital Locator (LOL) calculations and density of states (DOS) are pivotal in pinpointing electron density distributions within ZAL complexes when interacting with metal loaded silica nanocomposites. Through the NCI investigation (RDG & QTAIM), various types of intermolecular interactions especially Van der Waals forces, H-bonding, and repulsive steric effects have been discerned. The study also highlights the examination of bioactivity aspects and drug-likeness parameters pertaining to the compound under scrutiny. Moving forward, the utilization of molecular docking methodologies is anticipated to play a crucial role in evaluating the interaction energies associated with drug delivery processes.

{"title":"Enhancing drug delivery efficacy of antiretroviral drug Zalcitabine through silver/gold/platinum loaded silica nanocomposites: Surface modifications, molecular interactions, and computational insights.","authors":"G.F. Nivetha , M. Srinivasan , M. Mohan , K. Klinton Brito , B. Gokulapriya , M. Selvapandiyan , V. Vetrivelan , M. Prasath","doi":"10.1016/j.colsurfa.2025.136366","DOIUrl":"10.1016/j.colsurfa.2025.136366","url":null,"abstract":"<div><div>This article delves into the existing challenges and possibilities associated with the utilization of metal loaded silica nanocomposites in drug delivery applications, specifically focusing on silver, gold, platinum. Zalcitabine (ZAL) exhibits an adsorption with selected metal loaded silica nanocomposites (M-SiO<sub>2</sub> where M=Ag, Au and Pt) primarily through the nitrogen atom in primary amine, a phenomenon that shows varying interaction energies corresponding to the chosen metals. The utilization of silica nanocomposites causes alterations in the energy levels of Frontier Molecular Orbitals (FMO) through adsorption processes, ultimately leading to enhancements in drug delivery mechanisms. Furthermore, studies involving Molecular Electrostatic Potential (MEP) insight on the reactivity patterns of these complexes. An additional technique, Surface Enhanced Raman Scattering (SERS) amplifying the Raman signals of biomolecules by employing nanosized metal substrates. Electron Localization Function (ELF) alongside Localized Orbital Locator (LOL) calculations and density of states (DOS) are pivotal in pinpointing electron density distributions within ZAL complexes when interacting with metal loaded silica nanocomposites. Through the NCI investigation (RDG & QTAIM), various types of intermolecular interactions especially Van der Waals forces, H-bonding, and repulsive steric effects have been discerned. The study also highlights the examination of bioactivity aspects and drug-likeness parameters pertaining to the compound under scrutiny. Moving forward, the utilization of molecular docking methodologies is anticipated to play a crucial role in evaluating the interaction energies associated with drug delivery processes.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136366"},"PeriodicalIF":4.9,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349750","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

Capacitance-induced non-zero crossing hysteresis in CoWO4 thin-film resistive memory

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-02-05 DOI: 10.1016/j.colsurfa.2025.136348

Siddhi V. Patil , Amitkumar R. Patil , Tukaram D. Dongale , Santosh S. Sutar , Keshav Y. Rajpure

This study investigates the influence of capacitance on the non-zero crossing hysteresis observed in Ag/CoWO₄/FTO devices. This work successfully synthesized uniform and adherent cobalt tungstate (CoWO₄) film using spray pyrolysis at 350 ℃. The results revealed a pure, monoclinic polycrystalline phase with a crystallite size of ∼50 nm. The electrical properties demonstrated that a typical capacitive behavior characterizes current-voltage (I-V) hysteresis. The non-pinched hysteresis curve is observed from ±0.5 V to ±3 V, while the non-zero crossing hysteresis curve is obtained at ±4 V and ±5 V. The device demonstrates low power consumption, ranging from 0.3 nW to 310 nW across the tested voltage range. Reliability studies show minimal cycle-to-cycle variation (coefficient of variance <10 %) in SET and RESET currents, except at ±5 V. A higher Weibull β indicates more stable and uniform resistive switching. The β values for SET and RESET currents range from 10.06 to 58.06, excluding 146 at +3 V. Further, the fabricated device showed stable performance over 10³ switching cycles without degradation. The Ag/CoWO₄/FTO device exhibits double-valued charge-flux characteristics, suggesting it is a non-ideal memristor. The results suggest uniformity and reliability during the RS process. This work gives new insight into developing the metal tungstates-based memristive device based on the capacitive effect for non-volatile memory application.

{"title":"Capacitance-induced non-zero crossing hysteresis in CoWO4 thin-film resistive memory","authors":"Siddhi V. Patil , Amitkumar R. Patil , Tukaram D. Dongale , Santosh S. Sutar , Keshav Y. Rajpure","doi":"10.1016/j.colsurfa.2025.136348","DOIUrl":"10.1016/j.colsurfa.2025.136348","url":null,"abstract":"<div><div>This study investigates the influence of capacitance on the non-zero crossing hysteresis observed in Ag/CoWO<sub>4</sub>/FTO devices. This work successfully synthesized uniform and adherent cobalt tungstate (CoWO<sub>4</sub>) film using spray pyrolysis at 350 ℃. The results revealed a pure, monoclinic polycrystalline phase with a crystallite size of ∼50 nm. The electrical properties demonstrated that a typical capacitive behavior characterizes current-voltage (I-V) hysteresis. The non-pinched hysteresis curve is observed from ±0.5 V to ±3 V, while the non-zero crossing hysteresis curve is obtained at ±4 V and ±5 V. The device demonstrates low power consumption, ranging from 0.3 nW to 310 nW across the tested voltage range. Reliability studies show minimal cycle-to-cycle variation (coefficient of variance <10 %) in SET and RESET currents, except at ±5 V. A higher Weibull β indicates more stable and uniform resistive switching. The β values for SET and RESET currents range from 10.06 to 58.06, excluding 146 at +3 V. Further, the fabricated device showed stable performance over 10<sup>3</sup> switching cycles without degradation. The Ag/CoWO<sub>4</sub>/FTO device exhibits double-valued charge-flux characteristics, suggesting it is a non-ideal memristor. The results suggest uniformity and reliability during the RS process. This work gives new insight into developing the metal tungstates-based memristive device based on the capacitive effect for non-volatile memory application.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136348"},"PeriodicalIF":4.9,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349757","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

Single-step preparation of copper nanoparticle-enhanced activated carbon for anionic dye adsorption

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-02-05 DOI: 10.1016/j.colsurfa.2025.136359

Badr M. Thamer , Faiz A. Al-aizari , Hany S. Abdo , Hamud A. Altaleb

The utilization of zero-valent metals@activated carbon composites as adsorbents has shown significant potential. In this study, a one-step pyrolysis method using copper acetate and pomegranate peel waste in presence potassium hydroxide was used to prepare nanoscale copper supported on biomass-derived porous activated carbon (ZVCu@PAC) to apply as a promising adsorbent. ZVCu@PAC exhibited promising characteristics, boasting a high specific surface area (1211 m²/g), large total pore volume (0.547 cm³/g), and hierarchical porosity with uniformly dispersed nanoscale copper particles (4.52 nm). The adsorption capacity of ZVCu@PAC for anionic dyes exceeds that for cationic dyes. Naphthol blue black (NBB) as anionic dye was used as a model to examine the effects of pH, concentration, time, and temperature on the adsorption process. The kinetic and isotherm studies indicated that the pseudo-first-order and Freundlich models best-described adsorption onto PAC, while the Elovich and Langmuir models were more suitable for ZVCu@PAC. The Langmuir isotherm model revealed a significant enhancement in the maximum adsorption capacity of ZVCu@PAC, reaching 520.03 mg/g versus 311.45 mg/g for unmodified PAC. Through thermodynamic analysis, it was determined that the adsorption process is spontaneous (ΔG° < 0) and endothermic (ΔH° > 0), indicating that it is driven by an increase in entropy and requires an input of energy. The ZVCu@PAC exhibited excellent reusability, maintaining its adsorption capacity for six consecutive cycles. It also demonstrated a high efficiency in removing mixtures of anionic/cationic dyes. This study demonstrates a simple method for improving activated carbon adsorption with metals nanoparticles, promoting progress in dye-contaminated water treatment.

{"title":"Single-step preparation of copper nanoparticle-enhanced activated carbon for anionic dye adsorption","authors":"Badr M. Thamer , Faiz A. Al-aizari , Hany S. Abdo , Hamud A. Altaleb","doi":"10.1016/j.colsurfa.2025.136359","DOIUrl":"10.1016/j.colsurfa.2025.136359","url":null,"abstract":"<div><div>The utilization of zero-valent metals@activated carbon composites as adsorbents has shown significant potential. In this study, a one-step pyrolysis method using copper acetate and pomegranate peel waste in presence potassium hydroxide was used to prepare nanoscale copper supported on biomass-derived porous activated carbon (ZVCu@PAC) to apply as a promising adsorbent. ZVCu@PAC exhibited promising characteristics, boasting a high specific surface area (1211 m²/g), large total pore volume (0.547 cm³/g), and hierarchical porosity with uniformly dispersed nanoscale copper particles (4.52 nm). The adsorption capacity of ZVCu@PAC for anionic dyes exceeds that for cationic dyes. Naphthol blue black (NBB) as anionic dye was used as a model to examine the effects of pH, concentration, time, and temperature on the adsorption process. The kinetic and isotherm studies indicated that the pseudo-first-order and Freundlich models best-described adsorption onto PAC, while the Elovich and Langmuir models were more suitable for ZVCu@PAC. The Langmuir isotherm model revealed a significant enhancement in the maximum adsorption capacity of ZVCu@PAC, reaching 520.03 mg/g versus 311.45 mg/g for unmodified PAC. Through thermodynamic analysis, it was determined that the adsorption process is spontaneous (ΔG° < 0) and endothermic (ΔH° > 0), indicating that it is driven by an increase in entropy and requires an input of energy. The ZVCu@PAC exhibited excellent reusability, maintaining its adsorption capacity for six consecutive cycles. It also demonstrated a high efficiency in removing mixtures of anionic/cationic dyes. This study demonstrates a simple method for improving activated carbon adsorption with metals nanoparticles, promoting progress in dye-contaminated water treatment.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136359"},"PeriodicalIF":4.9,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143219182","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

Construction puerarin-based framework as a bone-targeted and pH-responsive nanomedicine for osteoporosis treatment

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-02-04 DOI: 10.1016/j.colsurfa.2025.136341

Yibiao Zhou , Xiaowei Yang , Chao Deng , Yongjie Xia , Shengping Tang , Hongwu Zeng , Bin Zhang , Xiaoyong Zhang , Guibing Fu , Chao You

Osteoporosis (OP) is a degenerative bone disease that commonly occurs in elderly people. It often manifests in bone pain and increased risk of fractures, significantly impacting the quality of life for middle-aged and elderly individuals. Several anti-osteoporosis drugs are currently available in clinical practice, their long-term use has shown limited efficacy and potential complications. The natural compound puerarin (Pue) has demonstrated to be promising for OP treatment via regulating osteoclast and osteoblast differentiation. However, its poor solubility, low bioavailability, and lack of bone-targeting severely impeded its clinical applications. To address the above issues, we reported herein the synthesis of Pue-based framework (HCCP-Pue-PEG-ALN, HPPA NPs) via conjugation of Pue, NH₂-PEG, and alendronic acid (ALN) using hexachlorocyclotriphosphazene (HCCP) as the linkage. We demonstrated that the HPPA NPs display the features, including high water dispersibility, pH responsive drug release, low cytotoxicity, bone targeting feature, and positive effects on both osteoclasts and osteoblasts. Therefore, we believe this idea reported in this work will be of great interest in design natural compounds-based drug delivery systems and promotes clinic translation of natural compounds for OP treatment.

{"title":"Construction puerarin-based framework as a bone-targeted and pH-responsive nanomedicine for osteoporosis treatment","authors":"Yibiao Zhou , Xiaowei Yang , Chao Deng , Yongjie Xia , Shengping Tang , Hongwu Zeng , Bin Zhang , Xiaoyong Zhang , Guibing Fu , Chao You","doi":"10.1016/j.colsurfa.2025.136341","DOIUrl":"10.1016/j.colsurfa.2025.136341","url":null,"abstract":"<div><div>Osteoporosis (OP) is a degenerative bone disease that commonly occurs in elderly people. It often manifests in bone pain and increased risk of fractures, significantly impacting the quality of life for middle-aged and elderly individuals. Several anti-osteoporosis drugs are currently available in clinical practice, their long-term use has shown limited efficacy and potential complications. The natural compound puerarin (Pue) has demonstrated to be promising for OP treatment via regulating osteoclast and osteoblast differentiation. However, its poor solubility, low bioavailability, and lack of bone-targeting severely impeded its clinical applications. To address the above issues, we reported herein the synthesis of Pue-based framework (HCCP-Pue-PEG-ALN, HPPA NPs) via conjugation of Pue, NH<sub>2</sub>-PEG, and alendronic acid (ALN) using hexachlorocyclotriphosphazene (HCCP) as the linkage. We demonstrated that the HPPA NPs display the features, including high water dispersibility, pH responsive drug release, low cytotoxicity, bone targeting feature, and positive effects on both osteoclasts and osteoblasts. Therefore, we believe this idea reported in this work will be of great interest in design natural compounds-based drug delivery systems and promotes clinic translation of natural compounds for OP treatment.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136341"},"PeriodicalIF":4.9,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143219530","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