Colloids and Surfaces A: Physicochemical and Engineering Aspects最新文献_第5页

Suppressed Mn dissolution behavior to improve cycling performance of Cr-modified Li1-xMn2O4 electrodes

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-01-31 DOI: 10.1016/j.colsurfa.2025.136283

MengJun Zhang , Chao Sun , JiangYao Li , ChengLong Shi , Xiumin Li , Bing Zhao

Stably and efficiently extracting lithium from brine sources is critical for addressing pressing energy and environmental challenges. LiMn₂O₄ electrodes are widely used in electrochemical lithium recovery systems due to their effectiveness in lithium extraction. However, their limited extraction capacity and insufficient stability hinder their practical application. To overcome these challenges, we synthesized a series of Cr-modified LiMn₂O₄ (111) crystal plane materials, driven by the understanding that the multi-electron nature of Cr could improve stability without compromising lithium adsorption capacity. Indeed, the Cr-modified LiMn₂O₄ showed significantly enhanced performance, including reduced Mn dissolution (3.73 %), lower resistance, and better stability compared to the unmodified LiMn₂O₄ (1.38 %). The experimental results demonstrated that Cr doping successfully enhanced the material's stability, and theoretical calculations further confirmed that Cr incorporation enhances the electrode's lithium adsorption ability, as evidenced by the more negative adsorption energy for Li(H₂O)₄⁺ (–3.52 eV for Mn₂O₄ vs. –4.09 eV for Cr_1.0Mn_1.0O₄), thereby improving its overall adsorption performance. LiCr_1.0Mn_1.0O₄, with an expanded lattice constant, demonstrated a higher Li⁺ diffusion coefficient (6.90*10⁻¹¹) and lower intercalation energy, as verified by cyclic voltammetry. In hybrid capacitive deionization (CDI) experiments, LiCr_1.0Mn_1.0O₄ showed a minimal Mn dissolution loss of only 1.37 %, while maintaining a Li⁺ intercalation capacity of 21.51 mg/g. These findings highlight the potential of Cr modification on the (111) facets of LiMn₂O₄ as an effective strategy to enhance electrochemical lithium extraction performance, providing a promising approach for efficient lithium recovery in practical applications.

{"title":"Suppressed Mn dissolution behavior to improve cycling performance of Cr-modified Li1-xMn2O4 electrodes","authors":"MengJun Zhang , Chao Sun , JiangYao Li , ChengLong Shi , Xiumin Li , Bing Zhao","doi":"10.1016/j.colsurfa.2025.136283","DOIUrl":"10.1016/j.colsurfa.2025.136283","url":null,"abstract":"<div><div>Stably and efficiently extracting lithium from brine sources is critical for addressing pressing energy and environmental challenges. LiMn<sub>2</sub>O<sub>4</sub> electrodes are widely used in electrochemical lithium recovery systems due to their effectiveness in lithium extraction. However, their limited extraction capacity and insufficient stability hinder their practical application. To overcome these challenges, we synthesized a series of Cr-modified LiMn<sub>2</sub>O<sub>4</sub> (111) crystal plane materials, driven by the understanding that the multi-electron nature of Cr could improve stability without compromising lithium adsorption capacity. Indeed, the Cr-modified LiMn<sub>2</sub>O<sub>4</sub> showed significantly enhanced performance, including reduced Mn dissolution (3.73 %), lower resistance, and better stability compared to the unmodified LiMn<sub>2</sub>O<sub>4</sub> (1.38 %). The experimental results demonstrated that Cr doping successfully enhanced the material's stability, and theoretical calculations further confirmed that Cr incorporation enhances the electrode's lithium adsorption ability, as evidenced by the more negative adsorption energy for Li(H<sub>2</sub>O)<sub>4</sub>⁺ (–3.52 eV for Mn<sub>2</sub>O<sub>4</sub> vs. –4.09 eV for Cr<sub>1.0</sub>Mn<sub>1.0</sub>O<sub>4</sub>), thereby improving its overall adsorption performance. LiCr<sub>1.0</sub>Mn<sub>1.0</sub>O<sub>4</sub>, with an expanded lattice constant, demonstrated a higher Li<sup>+</sup> diffusion coefficient (6.90*10<sup>−11</sup>) and lower intercalation energy, as verified by cyclic voltammetry. In hybrid capacitive deionization (CDI) experiments, LiCr<sub>1.0</sub>Mn<sub>1.0</sub>O<sub>4</sub> showed a minimal Mn dissolution loss of only 1.37 %, while maintaining a Li<sup>+</sup> intercalation capacity of 21.51 mg/g. These findings highlight the potential of Cr modification on the (111) facets of LiMn<sub>2</sub>O<sub>4</sub> as an effective strategy to enhance electrochemical lithium extraction performance, providing a promising approach for efficient lithium recovery in practical applications.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"710 ","pages":"Article 136283"},"PeriodicalIF":4.9,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152918","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

One-step surface modification of small molecule taurine for the preparation of high-performance reverse osmosis membranes

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-01-31 DOI: 10.1016/j.colsurfa.2025.136314

Bangzhen Liu , Fuhao Zhang , Zicheng Wang , Tengfang Zhang , Xun Zhou , Yuhao Chen , Haixiang Sun

Hypothesis

Surface modification is a prevalent method for reverse osmosis (RO) membranes to enhance the separation performance due to its advantageous characteristics, including stability and ease of integration. However, the macromolecules utilized in modification processes often need intricate procedures.

Experiments

In this work, the micromolecule taurine (TAU) was grafted onto RO membrane surface through a simple one-step covalent grafting modification. The mechanism of TAU modification was revealed through the characterization of morphology and structure of the membranes as well as the analysis of performance tests.

Findings

The molecular chain flexibility of the modified membrane was enhanced, which was conducive to the permeation performance. In addition, sulfonic acid groups were introduced onto the membrane surface with the objective of improving hydrophilicity, electronegativity and chelation with boric acid. The optimal modified membranes showed an enhancement of flux by over 40 % while maintaining the salt rejection rate. Furthermore, the modified membranes demonstrated lower flux decline rates in bovine serum albumin and dextran pollutants tests, indicating an enhancement in the membrane's fouling resistance. In addition, the modified membranes exhibited enhanced boron rejection properties. The one-step surface grafting modification strategy provides an effective method to improve the boron rejection capacity and fouling resistance of RO membranes.

{"title":"One-step surface modification of small molecule taurine for the preparation of high-performance reverse osmosis membranes","authors":"Bangzhen Liu , Fuhao Zhang , Zicheng Wang , Tengfang Zhang , Xun Zhou , Yuhao Chen , Haixiang Sun","doi":"10.1016/j.colsurfa.2025.136314","DOIUrl":"10.1016/j.colsurfa.2025.136314","url":null,"abstract":"<div><h3>Hypothesis</h3><div>Surface modification is a prevalent method for reverse osmosis (RO) membranes to enhance the separation performance due to its advantageous characteristics, including stability and ease of integration. However, the macromolecules utilized in modification processes often need intricate procedures.</div></div><div><h3>Experiments</h3><div>In this work, the micromolecule taurine (TAU) was grafted onto RO membrane surface through a simple one-step covalent grafting modification. The mechanism of TAU modification was revealed through the characterization of morphology and structure of the membranes as well as the analysis of performance tests.</div></div><div><h3>Findings</h3><div>The molecular chain flexibility of the modified membrane was enhanced, which was conducive to the permeation performance. In addition, sulfonic acid groups were introduced onto the membrane surface with the objective of improving hydrophilicity, electronegativity and chelation with boric acid. The optimal modified membranes showed an enhancement of flux by over 40 % while maintaining the salt rejection rate. Furthermore, the modified membranes demonstrated lower flux decline rates in bovine serum albumin and dextran pollutants tests, indicating an enhancement in the membrane's fouling resistance. In addition, the modified membranes exhibited enhanced boron rejection properties. The one-step surface grafting modification strategy provides an effective method to improve the boron rejection capacity and fouling resistance of RO membranes.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136314"},"PeriodicalIF":4.9,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161988","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

Modelling and simulation of surface-tension-dominant two-phase flows with an improved geometric volume of fluid framework

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-01-31 DOI: 10.1016/j.colsurfa.2025.136277

Huihuang Xia , Wei Ge

Two-phase flows with surface tension are ubiquitous in engineering applications. A high-fidelity numerical framework for capturing sharp interfaces and eliminating unphysical spurious currents is of great significance. To this end, an improved geometric VoF framework combining a numerical filtering approach to accurately calculate surface tension and effectively suppress spurious currents has been presented. Unlike traditional algebraic VoF approaches, our framework accurately captures sharp interfaces without any interface diffusion. Our improved numerical framework is implemented in the open-source C++ library OpenFOAM. Both two- and three-dimensional numerical benchmark cases are conducted to demonstrate the performance of our framework in suppressing spurious currents. Our framework shows the most superior performance when comparing against numerical results of two geometric VoF solvers, namely interIsoFoam and interFlow. Droplet spreading on a wall is employed to evaluate the performance of our framework in maintaining pre-specified contact angles on both hydrophilic and hydrophobic walls. Rayleigh–Taylor instability benchmark case shows the capability of our framework in capturing sharp interfaces for both cases with and without surface tension. Buoyancy-driven bubble rising simulations demonstrate improved accuracy in predicting bubble rising velocity without numerical oscillations. Furthermore, our model and numerical method are utilized to investigate the surface-tension-dominant droplet coalescence. Numerical results demonstrate the promising capability of our enhanced framework in predicting droplet spreading and coalescence dynamics.

{"title":"Modelling and simulation of surface-tension-dominant two-phase flows with an improved geometric volume of fluid framework","authors":"Huihuang Xia , Wei Ge","doi":"10.1016/j.colsurfa.2025.136277","DOIUrl":"10.1016/j.colsurfa.2025.136277","url":null,"abstract":"<div><div>Two-phase flows with surface tension are ubiquitous in engineering applications. A high-fidelity numerical framework for capturing sharp interfaces and eliminating unphysical spurious currents is of great significance. To this end, an improved geometric VoF framework combining a numerical filtering approach to accurately calculate surface tension and effectively suppress spurious currents has been presented. Unlike traditional algebraic VoF approaches, our framework accurately captures sharp interfaces without any interface diffusion. Our improved numerical framework is implemented in the open-source C++ library OpenFOAM. Both two- and three-dimensional numerical benchmark cases are conducted to demonstrate the performance of our framework in suppressing spurious currents. Our framework shows the most superior performance when comparing against numerical results of two geometric VoF solvers, namely interIsoFoam and interFlow. Droplet spreading on a wall is employed to evaluate the performance of our framework in maintaining pre-specified contact angles on both hydrophilic and hydrophobic walls. Rayleigh–Taylor instability benchmark case shows the capability of our framework in capturing sharp interfaces for both cases with and without surface tension. Buoyancy-driven bubble rising simulations demonstrate improved accuracy in predicting bubble rising velocity without numerical oscillations. Furthermore, our model and numerical method are utilized to investigate the surface-tension-dominant droplet coalescence. Numerical results demonstrate the promising capability of our enhanced framework in predicting droplet spreading and coalescence dynamics.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136277"},"PeriodicalIF":4.9,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161327","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

Probing the antifouling mechanism of the oil-water separation membranes with ZnO nanostructures

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-01-31 DOI: 10.1016/j.colsurfa.2025.136312

Yue Feng , Xun Liu , Jingyi Wang , Xinyu Zou , Dianlin Wang , Lei Xie

Nanostructures have been commonly incorporated into oil-water separation membranes to improve their antifouling properties. However, the antifouling mechanism of the membrane with different nanostructures is still unclear. In this work, ZnO nanostructures, i.e., nanorods, hollow nanorods and randomly assemble nanosheets, were constructed on polyvinylidene fluoride (PVDF) membrane surfaces. The resulted membranes exhibited improved antifouling properties in comparison with the pristine PVDF membrane, and the hollow nanorods showed the best antifouling property. The antifouling mechanism was investigated through direct force measurements between oil drops and membrane surfaces using atomic force microscopy. The theoretical analysis of approach force curves indicated that the repulsive electrical double layer force was enhanced at higher pH and in the presence of ZnO nanostructures, which prevented the oil attachment on the membrane surface. The retraction force curves suggested that the adhesion between oil and membrane was significantly affected by the ZnO nanostructures, and the adhesion followed the trend of hollow nanorods < randomly assemble nanosheets < nanorods. Consequently, the oil drops on the membrane with hollow nanorods could be easily removed by water rinsing, which agreed with the flux recovery results. This work provided a fundamental understanding of the antifouling mechanism of the oil-water separation membranes with nanostructures, and a useful guidance for constructing suitable surface structures for efficient oil-water separation membranes.

{"title":"Probing the antifouling mechanism of the oil-water separation membranes with ZnO nanostructures","authors":"Yue Feng , Xun Liu , Jingyi Wang , Xinyu Zou , Dianlin Wang , Lei Xie","doi":"10.1016/j.colsurfa.2025.136312","DOIUrl":"10.1016/j.colsurfa.2025.136312","url":null,"abstract":"<div><div>Nanostructures have been commonly incorporated into oil-water separation membranes to improve their antifouling properties. However, the antifouling mechanism of the membrane with different nanostructures is still unclear. In this work, ZnO nanostructures, i.e., nanorods, hollow nanorods and randomly assemble nanosheets, were constructed on polyvinylidene fluoride (PVDF) membrane surfaces. The resulted membranes exhibited improved antifouling properties in comparison with the pristine PVDF membrane, and the hollow nanorods showed the best antifouling property. The antifouling mechanism was investigated through direct force measurements between oil drops and membrane surfaces using atomic force microscopy. The theoretical analysis of approach force curves indicated that the repulsive electrical double layer force was enhanced at higher pH and in the presence of ZnO nanostructures, which prevented the oil attachment on the membrane surface. The retraction force curves suggested that the adhesion between oil and membrane was significantly affected by the ZnO nanostructures, and the adhesion followed the trend of hollow nanorods < randomly assemble nanosheets < nanorods. Consequently, the oil drops on the membrane with hollow nanorods could be easily removed by water rinsing, which agreed with the flux recovery results. This work provided a fundamental understanding of the antifouling mechanism of the oil-water separation membranes with nanostructures, and a useful guidance for constructing suitable surface structures for efficient oil-water separation membranes.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136312"},"PeriodicalIF":4.9,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143219525","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

Spartina alterniflora biochar coupled BiOBr with dominant exposed facet and oxygen vacancies for efficiently photocatalytic degradation of ciprofloxacin

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-01-31 DOI: 10.1016/j.colsurfa.2025.136306

Peng Ju , Shuo Yu , Guojia Zhang , Hongyu Mou , Jun Wang , Yingchao Li , Shiyao Lu , Jianchao Sun

Addressing water pollution caused from the misuse of ciprofloxacin (CIP) is an urgent issue. In this study, Spartina alterniflora biochar coupled BiOBr (BC@BiOBr) composites were hydrothermally synthesized to achieve a synergistic effect of adsorption-coupled photocatalytic oxidation. In the BC@BiOBr composites, BiOBr microspheres grew in-situ on the surface of Spartina alterniflora biochar, forming the layered structure assembled by many nanosheets. Among the obtained products, when the mass fraction of BC was 20%, BC@BiOBr-2 exhibited the best photocatalytic performance and superior stability towards the degradation of CIP, achieving a 100% degradation efficiency within 90 min. The introduction of BC not only elevated the adsorption ability and increased the active reaction sites, but also narrowed the band gap and enhanced the visible light response range of BiOBr, accompanied by the rich oxygen vacancies and dominant exposed (102) facet of BiOBr, synergistically improving the photocatalytic activity greatly. The photocatalytic mechanism was speculated according to the tests of electron paramagnetic resonance and radical quenching experiments, proving the predominant roles of ·O₂^- and ·OH during the photocatalytic process. Overall, this work provides a feasible strategy for enhancing the photocatalytic performance of BiOBr while promoting the high-value reuse of the invasive species Spartina alterniflora.

{"title":"Spartina alterniflora biochar coupled BiOBr with dominant exposed facet and oxygen vacancies for efficiently photocatalytic degradation of ciprofloxacin","authors":"Peng Ju , Shuo Yu , Guojia Zhang , Hongyu Mou , Jun Wang , Yingchao Li , Shiyao Lu , Jianchao Sun","doi":"10.1016/j.colsurfa.2025.136306","DOIUrl":"10.1016/j.colsurfa.2025.136306","url":null,"abstract":"<div><div>Addressing water pollution caused from the misuse of ciprofloxacin (CIP) is an urgent issue. In this study, <em>Spartina alterniflora</em> biochar coupled BiOBr (BC@BiOBr) composites were hydrothermally synthesized to achieve a synergistic effect of adsorption-coupled photocatalytic oxidation. In the BC@BiOBr composites, BiOBr microspheres grew <em>in-situ</em> on the surface of <em>Spartina alterniflora</em> biochar, forming the layered structure assembled by many nanosheets. Among the obtained products, when the mass fraction of BC was 20%, BC@BiOBr-2 exhibited the best photocatalytic performance and superior stability towards the degradation of CIP, achieving a 100% degradation efficiency within 90 min. The introduction of BC not only elevated the adsorption ability and increased the active reaction sites, but also narrowed the band gap and enhanced the visible light response range of BiOBr, accompanied by the rich oxygen vacancies and dominant exposed (102) facet of BiOBr, synergistically improving the photocatalytic activity greatly. The photocatalytic mechanism was speculated according to the tests of electron paramagnetic resonance and radical quenching experiments, proving the predominant roles of ·O<sub>2</sub><sup>-</sup> and ·OH during the photocatalytic process. Overall, this work provides a feasible strategy for enhancing the photocatalytic performance of BiOBr while promoting the high-value reuse of the invasive species <em>Spartina alterniflora</em>.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136306"},"PeriodicalIF":4.9,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143219155","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

Peptide conjugated nintedanib loaded graphene quantum dots: Characterization and cell based studies

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-01-30 DOI: 10.1016/j.colsurfa.2025.136298

Vrushti Kansara, Mitali Patel

The present study is aimed to develop the nitrogen doped graphene quantum dots (N-GQDs) based nanocarrier to target epidermal growth factor receptor (EGFR) in the treatment of non-small cell lung cancer (NSCLC). The N-GQDs were functionalized with GE11 peptide (a targeting agent) with high affinity for EGFR (GE11-N-GQDs), using carbodiimide chemistry. The studies revealed that the particle size of the N-GQDs increased to 96.88 ± 2.16 nm after NE loading (NE-N-GQDs). The GE11 functionalization and NE loading (GE11-NE-N-GQDs) further increased the particle size to 124.0 ± 1.76 nm. The particle shape of the GE11-NE-N-GQDs were cubic and quasi-hexagonal. The reduction in the crystallinity was evident by the selected area electron diffraction (SAED) pattern. The GE11-NE-N-GQDs showed higher drug loading (97.42 ± 1.15 %) and entrapment efficiency (98.14 ± 1.32 %) than the NE-N-GQDs (97.38 ± 1.46 %, 92.36 ± 1.68 %). The N-GQDs based nanocarriers displayed good antioxidant activity and hemocompatibility. The GE11-NE-N-GQDs displayed pH dependent and prolonged release (99.78 ± 2.20 %) at 50 h. The %cell viability of the GE11-NE-N-GQDs treated A549 (human lung adenocarcinoma) cells was less (IC₅₀: 1 µg/ml) than the NE-N-GQDs (IC₅₀: 3 µg/ml) and free NE (IC₅₀: 6.60 µg/ml). The GE11-N-GQDs enhanced intracellular uptake and arrested G1 phase which increased apoptosis and number of cells in sub-G1 phase. Hence, the results showed the GE11-N-GQDs as a promising approach to target EGFR overexpression in NSCLC.

{"title":"Peptide conjugated nintedanib loaded graphene quantum dots: Characterization and cell based studies","authors":"Vrushti Kansara, Mitali Patel","doi":"10.1016/j.colsurfa.2025.136298","DOIUrl":"10.1016/j.colsurfa.2025.136298","url":null,"abstract":"<div><div>The present study is aimed to develop the nitrogen doped graphene quantum dots (N-GQDs) based nanocarrier to target epidermal growth factor receptor (EGFR) in the treatment of non-small cell lung cancer (NSCLC). The N-GQDs were functionalized with GE11 peptide (a targeting agent) with high affinity for EGFR (GE11-N-GQDs), using carbodiimide chemistry. The studies revealed that the particle size of the N-GQDs increased to 96.88 ± 2.16 nm after NE loading (NE-N-GQDs). The GE11 functionalization and NE loading (GE11-NE-N-GQDs) further increased the particle size to 124.0 ± 1.76 nm. The particle shape of the GE11-NE-N-GQDs were cubic and quasi-hexagonal. The reduction in the crystallinity was evident by the selected area electron diffraction (SAED) pattern. The GE11-NE-N-GQDs showed higher drug loading (97.42 ± 1.15 %) and entrapment efficiency (98.14 ± 1.32 %) than the NE-N-GQDs (97.38 ± 1.46 %, 92.36 ± 1.68 %). The N-GQDs based nanocarriers displayed good antioxidant activity and hemocompatibility. The GE11-NE-N-GQDs displayed pH dependent and prolonged release (99.78 ± 2.20 %) at 50 h. The %cell viability of the GE11-NE-N-GQDs treated A549 (human lung adenocarcinoma) cells was less (IC<sub>50</sub>: 1 µg/ml) than the NE-N-GQDs (IC<sub>50</sub>: 3 µg/ml) and free NE (IC<sub>50</sub>: 6.60 µg/ml). The GE11-N-GQDs enhanced intracellular uptake and arrested G1 phase which increased apoptosis and number of cells in sub-G1 phase. Hence, the results showed the GE11-N-GQDs as a promising approach to target EGFR overexpression in NSCLC.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"711 ","pages":"Article 136298"},"PeriodicalIF":4.9,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349754","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

Rheology of dispersions containing non-spherical lipid particles

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-01-30 DOI: 10.1016/j.colsurfa.2025.136284

Zhulieta Valkova, Kristina Rusanova, Slavka Tcholakova, Diana Cholakova, Nikolai Denkov

The rheological properties of disperse systems play a crucial role in the production of foods, cosmetics, and pharmaceuticals with desired characteristics. Emulsion viscosity can be increased through various methods, incl. increasing the oil volume fraction, incorporating rheological modifiers, or inducing partial coalescence between the droplets. It is well known that suspensions containing inorganic non-spherical particles often exhibit significantly higher viscosities when compared to those with spherical particles. The spontaneous drop self-shaping phenomenon in emulsions, first reported in detail by Denkov et al. (Nature, 2015, 528, 392–395), enables the formation of fluid and frozen lipid particles with regular non-spherical shapes, including platelets, rods and fibers. In this study, we utilize this approach to prepare emulsions containing non-spherical frozen particles of various shapes and investigate their rheological properties. The effects of oil volume fraction, surfactant type, initial drop size and polydispersity are investigated. The results reveal that non-flowing, gel-like samples can be prepared at ca. 11 vol% oil fraction when the emulsion contains polydisperse droplets which acquire non-spherical shapes upon cooling. For comparison, more than ca. 65 vol% oil is needed to obtain similar rheological characteristics in samples containing spherical particles. Additionally, we demonstrate that the optimal drop size for gel preparation is d₃₂ ≈ 4–13 μm. The obtained results are explained mechanistically, and guiding principles are provided for preparing emulsions with increased viscosities using this new approach.

{"title":"Rheology of dispersions containing non-spherical lipid particles","authors":"Zhulieta Valkova, Kristina Rusanova, Slavka Tcholakova, Diana Cholakova, Nikolai Denkov","doi":"10.1016/j.colsurfa.2025.136284","DOIUrl":"10.1016/j.colsurfa.2025.136284","url":null,"abstract":"<div><div>The rheological properties of disperse systems play a crucial role in the production of foods, cosmetics, and pharmaceuticals with desired characteristics. Emulsion viscosity can be increased through various methods, incl. increasing the oil volume fraction, incorporating rheological modifiers, or inducing partial coalescence between the droplets. It is well known that suspensions containing inorganic non-spherical particles often exhibit significantly higher viscosities when compared to those with spherical particles. The spontaneous drop self-shaping phenomenon in emulsions, first reported in detail by Denkov et al. (<em>Nature</em>, 2015, <em>528</em>, 392–395), enables the formation of fluid and frozen lipid particles with regular non-spherical shapes, including platelets, rods and fibers. In this study, we utilize this approach to prepare emulsions containing non-spherical frozen particles of various shapes and investigate their rheological properties. The effects of oil volume fraction, surfactant type, initial drop size and polydispersity are investigated. The results reveal that non-flowing, gel-like samples can be prepared at <em>ca.</em> 11 vol% oil fraction when the emulsion contains polydisperse droplets which acquire non-spherical shapes upon cooling. For comparison, more than <em>ca.</em> 65 vol% oil is needed to obtain similar rheological characteristics in samples containing spherical particles. Additionally, we demonstrate that the optimal drop size for gel preparation is <em>d</em><sub><em>32</em></sub> ≈ 4–13 μm. The obtained results are explained mechanistically, and guiding principles are provided for preparing emulsions with increased viscosities using this new approach.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"710 ","pages":"Article 136284"},"PeriodicalIF":4.9,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis for TiN-MXene-Co@CNTs/S with high electrochemical performance

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-01-30 DOI: 10.1016/j.colsurfa.2025.136292

Qi Wu , Shuangsheng Xiong , Faming Gao

Transition metal sulfides (TMSs), due to their low cost, high theoretical capacity, and rich redox reactions, have become a research focus as anode materials for sodium-ion batteries (SIBs). However, problems such as low electrical conductivity, slow kinetic reactions, and irreversible volume changes significantly hinder their practical application. Through heterogeneous interface engineering, it is possible to improve substantially material reactivity, shorten ion diffusion paths, and enhance the structural stability of the materials, thereby overcoming these challenges. In this study, we have innovatively constructed a unique three-dimensional conductive network via in situ growing carbon nanotubes (CNTs) that encapsulate Co₉S₈/CoS nanoparticles on TiN-MXene nanosheets. The formation of the TiN-MXene-CNTs heterointerface enhances electrical conductivity and provides sufficient internal void space to accommodate volume expansion effectively. Furthermore, due to its high specific surface area and efficient electron transport pathways, the pseudocapacitive-controlled process plays a significant role in the electrochemical sodium storage of TiN-MXene-Co@CNTs/S. As a result, TiN-MXene-Co@CNTs/S exhibits exceptional performance, demonstrating a high specific capacity of 629.3 mA h g⁻¹ at 0.1 A g⁻¹, good cycling stability with a capacity of 303.4 mA h g⁻¹ after 100 cycles at 0.1 A g⁻¹, and excellent rate capability of 235.5 mA h g⁻¹ at 5 A g⁻¹. EIS, GITT, and CV tests further confirm its superior dynamic performance. Remarkably, the NVP||TiN-MXene-Co@CNTs/S full-cell battery setup maintains a capacity of 177.8 mA h g⁻¹ after 80 cycles at a current density of 0.1 A g⁻¹, highlighting its promising application potential.

{"title":"Synthesis for TiN-MXene-Co@CNTs/S with high electrochemical performance","authors":"Qi Wu , Shuangsheng Xiong , Faming Gao","doi":"10.1016/j.colsurfa.2025.136292","DOIUrl":"10.1016/j.colsurfa.2025.136292","url":null,"abstract":"<div><div>Transition metal sulfides (TMSs), due to their low cost, high theoretical capacity, and rich redox reactions, have become a research focus as anode materials for sodium-ion batteries (SIBs). However, problems such as low electrical conductivity, slow kinetic reactions, and irreversible volume changes significantly hinder their practical application. Through heterogeneous interface engineering, it is possible to improve substantially material reactivity, shorten ion diffusion paths, and enhance the structural stability of the materials, thereby overcoming these challenges. In this study, we have innovatively constructed a unique three-dimensional conductive network via in situ growing carbon nanotubes (CNTs) that encapsulate Co<sub>9</sub>S<sub>8</sub>/CoS nanoparticles on TiN-MXene nanosheets. The formation of the TiN-MXene-CNTs heterointerface enhances electrical conductivity and provides sufficient internal void space to accommodate volume expansion effectively. Furthermore, due to its high specific surface area and efficient electron transport pathways, the pseudocapacitive-controlled process plays a significant role in the electrochemical sodium storage of TiN-MXene-Co@CNTs/S. As a result, TiN-MXene-Co@CNTs/S exhibits exceptional performance, demonstrating a high specific capacity of 629.3 mA h g⁻¹ at 0.1 A g⁻¹, good cycling stability with a capacity of 303.4 mA h g⁻¹ after 100 cycles at 0.1 A g⁻¹, and excellent rate capability of 235.5 mA h g⁻¹ at 5 A g⁻¹. EIS, GITT, and CV tests further confirm its superior dynamic performance. Remarkably, the NVP||TiN-MXene-Co@CNTs/S full-cell battery setup maintains a capacity of 177.8 mA h g<sup>−1</sup> after 80 cycles at a current density of 0.1 A g<sup>−1</sup>, highlighting its promising application potential.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"710 ","pages":"Article 136292"},"PeriodicalIF":4.9,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152400","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

Benign preparation of metal organic framework materials with different copper precursors and adsorption of organic dyes

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-01-30 DOI: 10.1016/j.colsurfa.2025.136302

Yi Liu , Xingyu Gao , Yongfeng Liu , Yuzhong Niu , Rongjun Qu , Duolong Di

Two different metal organic framework (MOF) materials with Cu²⁺ as metal center providing by copper nitrate and copper chloride (denoted as MOF-1 and MOF-2, accordingly) were facilely prepared with ethanol and water as reaction solvents at room temperature for several hours. FTIR, XRD, SEM, XPS and pore structures of the MOF materials were characterized to verify that types of copper precursors would affect the structures of the MOF materials, which would also influence the adsorption efficiencies for methyl orange (MO) and methylene blue (MB). The adsorption kinetics and isotherm studies established pseudo-second-order kinetics and Freundlich isotherm with good agreement according to the data. Solution pH greatly affected the adsorption process. Presence of NaCl enhanced the adsorption of MO while it hindered MB removal. The differences in adsorption behaviors of both MOF materials for MO and MB were ascribed to their different structures which may be due to the types of copper salts. The results showed that carboxyl group, aromatic ring and metal center contributed greatly to the removal of MO and MB from aqueous solution. Both MOF materials exhibited higher adsorption efficiencies for the dyes (238.26 mg/g for MO and 217.60 mg/g for MB of MOF-1, 277.02 mg/g for MO and 167.80 mg/g for MB for MOF-2), compared to several reported MOF related materials. This study indicated that the prepared MOF materials could be used as viable candidates to effectively remove MO and MB from aqueous solution.

{"title":"Benign preparation of metal organic framework materials with different copper precursors and adsorption of organic dyes","authors":"Yi Liu , Xingyu Gao , Yongfeng Liu , Yuzhong Niu , Rongjun Qu , Duolong Di","doi":"10.1016/j.colsurfa.2025.136302","DOIUrl":"10.1016/j.colsurfa.2025.136302","url":null,"abstract":"<div><div>Two different metal organic framework (MOF) materials with Cu<sup>2+</sup> as metal center providing by copper nitrate and copper chloride (denoted as MOF-1 and MOF-2, accordingly) were facilely prepared with ethanol and water as reaction solvents at room temperature for several hours. FTIR, XRD, SEM, XPS and pore structures of the MOF materials were characterized to verify that types of copper precursors would affect the structures of the MOF materials, which would also influence the adsorption efficiencies for methyl orange (MO) and methylene blue (MB). The adsorption kinetics and isotherm studies established pseudo-second-order kinetics and Freundlich isotherm with good agreement according to the data. Solution pH greatly affected the adsorption process. Presence of NaCl enhanced the adsorption of MO while it hindered MB removal. The differences in adsorption behaviors of both MOF materials for MO and MB were ascribed to their different structures which may be due to the types of copper salts. The results showed that carboxyl group, aromatic ring and metal center contributed greatly to the removal of MO and MB from aqueous solution. Both MOF materials exhibited higher adsorption efficiencies for the dyes (238.26 mg/g for MO and 217.60 mg/g for MB of MOF-1, 277.02 mg/g for MO and 167.80 mg/g for MB for MOF-2), compared to several reported MOF related materials. This study indicated that the prepared MOF materials could be used as viable candidates to effectively remove MO and MB from aqueous solution.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"710 ","pages":"Article 136302"},"PeriodicalIF":4.9,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152402","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

Efficient flotation separation mechanism of scheelite from calcite and fluorite using carboxymethyl sulfonated lignin as environmentally friendly depressant

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-01-30 DOI: 10.1016/j.colsurfa.2025.136311

Chuxiong Shen , Xiaomeng Yang , Zhangpan Li , Dan Wu , Yijun Cao , Yongsheng Zhang , Wencui Chai

Scheelite is an important strategic resource and often associated with calcium-bearing minerals (calcite and/or fluorite), which pose a challenge to flotation separation due to their similar surface properties. The development of highly selective depressants is essential to effectively achieving flotation separation. In this work, carboxymethyl sulfonated organic solvent lignin (CSOL) with varying degrees of carboxylation was synthesized to serve as an organic depressant. Flotation results showed that with the addition of CSOL, the recoveries of calcite and fluorite significantly decreased from 70.98 % to 9.34 % and from 91.8 % to 8.00 %, respectively, while the recovery of scheelite dropped slightly, from 94.9 % to 91.62 %. The contact angle, zeta potential and XPS results demonstrated that hydrophilic CSOL could adsorb onto the calcite sites on the surfaces of calcite and fluorite through carboxyl and sulfonic groups, thus increasing their hydrophilicity and decreasing their floatability. Negatively charged CSOL had a small amount of adsorption on the negatively charged scheelite surface due to strong electrostatic repulsion, thus it had no great effect on the further adsorption of collector sodium oleate (NaOL) and flotation of scheelite. This work provides valuable insights into the flotation performance and mechanisms of lignin-based environmentally friendly depressants for flotation separation of scheelite from calcium-containing gangue minerals.

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引用次数: 0