Colloids and Surfaces A: Physicochemical and Engineering Aspects最新文献_第4页

Structure, morphology and crystallization behavior of PVDF/Co nanowire nanocomposites under horizontal and vertical magnetic fields 水平和垂直磁场下 PVDF/Co 纳米线纳米复合材料的结构、形态和结晶行为

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-06 DOI: 10.1016/j.colsurfa.2024.135734

Ghodsiyeh Hashemi Kachabi , Mohammad Noormohammadi , Mohammad Almasi Kashi , Mohsen Mohammadalizadeh

So far, very limited research has been carried out on the fabrication of polyvinylidene fluoride (PVDF) composited with anisotropic magnetic nanostructures such as nanowires or nanorods, which can potentially provide specific reactions to magnetic fields. Here, single crystal Co nanowires (CNWs) with an average length and diameter of about 220 and 12 nm, respectively, are synthesized using a solvothermal method, followed by adding them to PVDF matrix in order to prepare flexible PVDF/CNW nanocomposites by solvent casting and solution crystallization processes at room temperature. The nucleation and growth of PCNW nanocomposites are investigated in the absence and presence of horizontal and vertical magnetic fields. According to FESEM images, in addition to the direction of the applied magnetic field, the presence or absence of CNWs induces different effects on the size of spherulites and the configuration of polymer chains. By adding CNW to the PVDF matrix in the absence of a magnetic field and under a horizontal magnetic field, the size of the spherulites in the pure PVDF film increases about 67 % (from 3 to 5 μm) and 300 % (from 3 to 12 μm), respectively. Under a vertical magnetic field, the addition of CNW reduces the size of the spherulites to 1 μm, thereby forming a film with a combination of spherulites and filamentary structure likely due to the nanowire-nanowire, nanowire-chain and chain-chain interactions. Also non-contact flexible triboelectric nanogenerators of magnetic force are fabricated.

迄今为止，关于聚偏二氟乙烯（PVDF）与各向异性磁性纳米结构（如纳米线或纳米棒）复合的研究非常有限，而这些结构有可能对磁场产生特定的反应。本文采用溶解热法合成了平均长度和直径分别约为 220 纳米和 12 纳米的单晶钴纳米线（CNWs），然后将其添加到 PVDF 基体中，在室温下通过溶剂浇铸和溶液结晶过程制备出柔性 PVDF/CNW 纳米复合材料。研究了 PCNW 纳米复合材料在无磁场和有磁场条件下的成核和生长过程。根据 FESEM 图像，除了外加磁场的方向外，CNW 的存在与否也会对球形颗粒的大小和聚合物链的构型产生不同的影响。在无磁场和水平磁场条件下，向 PVDF 基体中添加 CNW 后，纯 PVDF 薄膜中的球形微粒尺寸分别增加了约 67%（从 3 μm 增至 5 μm）和 300%（从 3 μm 增至 12 μm）。在垂直磁场下，加入 CNW 后，球状微粒的尺寸减小到 1 μm，从而形成了球状微粒和丝状结构相结合的薄膜，这可能是纳米线-纳米线、纳米线-链和链-链相互作用的结果。此外，还制作了非接触式柔性三电纳米磁力发生器。

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引用次数: 0

Preparation and characterization of a novel active sediment capping material (geopolymer) for inhibiting phosphate releasing from sediment 用于抑制沉积物中磷酸盐释放的新型活性沉积物封盖材料（土工聚合物）的制备与表征

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-06 DOI: 10.1016/j.colsurfa.2024.135687

Meng Lu , Yuxin Xie , Xiao Hu , Yongjie Xue , Haobo Hou , Zhen Hu , Wentao Li , Teng Wang

In situ remediation of sediment can effectively control the release of phosphate in sediment and improve water eutrophication. The essential question of this remediation techniques lies in the development of stable, high-efficiency, low-cost and easily available active sediment capping materials. This study synthesised a novel sediment capping material using bulk solid waste, and phosphate inhibition mechanism of the materials was explored. Results indicated that GSCM was prepared under the conditions of NaOH concentration of 3 M, hydrothermal temperature of 160℃, hydrothermal time of 36 h and the mass ratio of 40 wt% SS to 60 wt% FA. The result of batch adsorption and compressive strength test suggested that phosphate adsorption capacity and compressive strength of GSCM were 2.15 mg/g and 24.20 MPa, respectively. The characterization result showed that GSCM was composed of sodium zeolite, riversideite, grossular and fayalite, exhibiting a uniformly distributed slit mesoporous structure. The in-situ inhibition efficiency of GSCM to P ranged from 76.65 % to 86.72 %, exceeding that of commercial zeolite. The in-situ inhibition mechanism was controlled by sodium zeolite and riversideite, and concluded by the following:1) Substitution between [SiO₄] tetrahedra (within the sodium zeolite structure), -OH (on the surface of materials) and [PO₄], 2) Coordination of [PO₄] tetrahedra with Al active site within the sodium zeolite structure, 3) Precipitation reaction between phosphate and slow-release of Ca²⁺ from the riversideite.

沉积物原位修复可以有效控制沉积物中磷酸盐的释放，改善水体富营养化状况。这种修复技术的关键问题在于开发稳定、高效、低成本、易获得的活性沉积物封盖材料。本研究利用大宗固体废弃物合成了一种新型沉积物覆盖材料，并探讨了该材料的磷酸盐抑制机理。结果表明，在 NaOH 浓度为 3 M、水热温度为 160℃、水热时间为 36 h、质量比为 40 wt% SS 与 60 wt% FA 的条件下制备了 GSCM。批量吸附和抗压强度试验结果表明，GSCM 的磷酸盐吸附量和抗压强度分别为 2.15 mg/g 和 24.20 MPa。表征结果表明，GSCM 由钠质沸石、河泥质沸石、芒硝和斐来石组成，呈均匀分布的狭缝中孔结构。GSCM 对 P 的原位抑制效率为 76.65 % 至 86.72 %，超过了商用沸石的抑制效率。钠沸石和河泥石控制了原位抑制机理，并得出以下结论：1）[SiO4]四面体（钠沸石结构内）、-OH（材料表面）和[PO4]之间的置换；2）[PO4]四面体与钠沸石结构内 Al 活性位点的配位；3）磷酸盐之间的沉淀反应和河泥石中 Ca2+ 的缓慢释放。

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引用次数: 0

Efficient dye-sensitized solar cell with affordable alternative to platinum free counter electrode 采用经济实惠的无铂对电极替代品的高效染料敏化太阳能电池

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-06 DOI: 10.1016/j.colsurfa.2024.135736

Sharmila Tharuman , Tse-Wei Chen , Shen-Ming Chen , Elayappan Tamilalagan , Wedad A. Al-onazi , M. Ajmal Ali , Jaysan Yu

The study focuses on MnCO₃/reduced graphene oxide (rGO) composite to investigate its capability against reduction of triiodide (I₃⁻), and hence to utilise its potential as a platinum free electrode in dye-sensitized solar cells (DSSCs). The MnCO₃/rGO composites were prepared with varying weight percentages of rGO to identify the optimal configuration to attain enhanced catalytic performance. The MnCO₃/rGO 75 wt% composite exhibited the optimal catalytic reaction kinetics for converting triiodide (I₃⁻) to iodide (I⁻), achieving a photon to electron conversion efficiency (PCE) of 6.62 %, with a photocurrent density (Jsc) of 13.29 mA cm⁻², voltage (Voc) of 0.76 V, and a fill factor (FF) of 0.65 at without load. This output performance is on par with that of to that of a conventional platinum (Pt) Counter Electrode, which achieved a PCE of 6.98 %. The findings indicate that MnCO₃/rGO 75 wt% composite shows significant promise, cost-effective alternative to Pt, offering efficient performance and improved material sustainability.

本研究以 MnCO3/还原氧化石墨烯（rGO）复合材料为重点，研究其还原三碘化物（I3-）的能力，从而利用其作为染料敏化太阳能电池（DSSC）中无铂电极的潜力。我们制备了不同重量百分比的 MnCO3/rGO 复合材料，以确定获得更强催化性能的最佳配置。MnCO3/rGO 75 wt% 复合材料表现出将三碘化物（I3-）转化为碘化物（I-）的最佳催化反应动力学，实现了 6.62 % 的光子到电子转化效率（PCE），光电流密度（Jsc）为 13.29 mA cm-²，电压（Voc）为 0.76 V，无负载时的填充因子（FF）为 0.65。这一输出性能与传统的铂 (Pt) 反电极相当，后者的 PCE 为 6.98%。研究结果表明，MnCO3/rGO 75 wt% 复合材料前景广阔，是铂的经济高效替代品，具有高效的性能和更好的材料可持续性。

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引用次数: 0

Polymers marry with carbon nanospheres: A promising strategy to develop high-performance filtrate reducer 聚合物与碳纳米球的结合：开发高性能滤液减压器的有效策略

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-06 DOI: 10.1016/j.colsurfa.2024.135688

Shangdong Gao , Dan Lin , Ao Li , Shuangyang Li , Shahbaz Wakeel , Jie Cao , Liandong Deng , Anjie Dong , Jianhua Zhang

Polymeric filtrate reducers have limited uses under high temperature and salinity conditions. The incorporation of nanoparticles to polymeric networks is a popular and effective method for creating high-performance filtrate reducers. However, present nanofillers are costly, have negative environmental consequences, and are difficult or impossible to disseminate. Herein, a simple hydrothermal process using low-cost and renewable glucose as raw ingredients resulted in hydroxy-rich carbon nanospheres (CNs). After modification by acryloyl chloride, the CNs were copolymerized with acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, and sodium p-styrene sulfonate. The obtained CNs-doped polymers (CAAS) were able to maintain high viscosity and colloidal stability even after salt contamination and high temperature aging. CAAS-based drilling fluids can tolerate temperatures of up to 240 °C under 30 % NaCl conditions. The API filtration loss (FL_API) and the high-temperature high-pressure filtration loss (FL_HTHP) were 10 and 63.5 mL, respectively. Considering the low-cost and renewable raw materials, high dispersibility and high compatibility of CNs as well as significant improvement in thermal-resistance and salt-tolerance, this work provides a simple yet effective approach to developing high-performance filtrate reducers for complex geological conditions.

在高温和高盐度条件下，聚合物滤液还原剂的用途有限。在聚合物网络中加入纳米颗粒是制造高性能滤液还原剂的一种流行而有效的方法。然而，目前的纳米填料成本高昂，对环境有负面影响，而且难以或无法推广。在此，使用低成本、可再生的葡萄糖作为原料，通过简单的水热法制备出富含羟基的碳纳米球（CNs）。经丙烯酰氯改性后，碳纳米管与丙烯酰胺、2-丙烯酰胺基-2-甲基丙磺酸和对苯乙烯磺酸钠共聚。获得的掺杂氯化萘的聚合物（CAAS）即使在盐污染和高温老化后仍能保持高粘度和胶体稳定性。在 30% NaCl 条件下，基于 CAAS 的钻井液可耐受高达 240 °C 的温度。API 滤失量（FLAPI）和高温高压滤失量（FLHTHP）分别为 10 mL 和 63.5 mL。考虑到氯化萘的低成本和可再生原料、高分散性和高兼容性以及显著的耐热性和耐盐性，这项工作为开发适用于复杂地质条件的高性能降滤剂提供了一种简单而有效的方法。

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引用次数: 0

One-pot fabrication of sodium deoxycholate based supramolecular self-healing antibacterial double network hydrogels 基于脱氧胆酸钠的超分子自愈合抗菌双网络水凝胶的一步法制造

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-06 DOI: 10.1016/j.colsurfa.2024.135727

Malaika Azhar Baig , Pritha Saha , Madhumita Mukhopadhyay , Jayanta Mukhopadhyay , Arijit Kapuria , Moupiya Ghosh , Susmita Das

Double network (DN) hydrogels have emerged as a significant technology for enhancement of mechanical strength of weak supramolecular gels. In the present study, we report the one-pot route for design of a low molecular weight gelator based DN hydrogel wherein sodium deoxycholate (NaDC) forms the primary network entangled with agar matrix. Various compositions of the reported agar-NaDC hydrogels were examined through FTIR, sol-gel transition temperature (T_sg), XRD, circular dichroism (CD), scanning electron microscopy (SEM), hydrophobicity probe studies, Zeta potential studies and rheology measurements. Analysis of all studies together reveal that 1 mg/ml agar-NaDC DN hydrogel is the optimum composition that exhibits dense networking with primarily β-sheet like structure, highest mechanical strength as well as self-healing characteristics with reversed optical activity and highest T_sg. Antibacterial activity studied using inhibition zone method suggests that 1 mg/ml agar-NaDC gel demonstrates significant bactericidal effect unlike the pure gel with an inhibition zone of ∼25 mm against E.coli after 24 h and ∼32 mm after 48 h incubation. The antibacterial activity was unique for this composition of the DN hydrogel which is attributed to its reversal in optical activity exhibiting positive cotton effect resulting in stronger interaction with the bacterial cell wall. Additionally, nearly 2 times reduced water absorption capacity of the 1 mg/ml agar-NaDC DN hydrogel compared to pure NaDC hydrogel ensures the retention of its mechanical strength as well as other properties in high moisture containing environment. Hence, the 1 mg/ml agar-NaDC DN hydrogel holds appreciable potential as a novel strong supramolecular self-healing antibacterial hydrogel with sustained release characteristics primarily important for biomedical applications.

双网络（DN）水凝胶已成为增强弱超分子凝胶机械强度的一项重要技术。在本研究中，我们报告了设计基于低分子量凝胶剂的 DN 水凝胶的一步法路线，其中脱氧胆酸钠（NaDC）与琼脂基质形成缠结的主网络。通过傅立叶变换红外光谱（FTIR）、溶胶-凝胶转变温度（Tsg）、X射线衍射（XRD）、圆二色性（CD）、扫描电子显微镜（SEM）、疏水性探针研究、Zeta电位研究和流变学测量，对所报道的琼脂-NaDC水凝胶的各种成分进行了检测。对所有研究的综合分析表明，1 毫克/毫升的琼脂-NaDC DN 水凝胶是最佳组合物，它具有致密的网络结构，主要为 β 片状结构，具有最高的机械强度和自愈合特性，并具有反向光学活性和最高的 Tsg。采用抑菌区法研究的抗菌活性表明，与纯凝胶不同，1 毫克/毫升的琼脂-NaDC 凝胶具有显著的杀菌效果，24 小时后对大肠杆菌的抑菌区为 25 毫米，48 小时后为 32 毫米。这种 DN 水凝胶具有独特的抗菌活性，这是因为它的光学活性发生了逆转，表现出正棉效应，从而与细菌细胞壁产生更强的相互作用。此外，与纯 NaDC 水凝胶相比，1 毫克/毫升琼脂-NaDC DN 水凝胶的吸水能力降低了近 2 倍，这确保了它在高含水量环境中仍能保持机械强度和其他特性。因此，1 毫克/毫升的琼脂-NaDC DN 水凝胶作为一种新型强效超分子自愈合抗菌水凝胶，具有持续释放特性，在生物医学应用中具有重要的潜力。

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引用次数: 0

Determination of antioxidant capacity of glutathione encapsulated in alginate microcapsules using spectrophotometric and electrochemical methods 利用分光光度法和电化学法测定封装在海藻酸盐微胶囊中的谷胱甘肽的抗氧化能力

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-06 DOI: 10.1016/j.colsurfa.2024.135735

Alexandra Virginia Bounegru, Ştefan Dima, Constantin Apetrei

This paper includes the preparation and physicochemical characterization of sodium alginate microcapsules intended for the oral administration of glutathione (GSH), a vital endogenous antioxidant in combating oxidative stress. Using various methods such as optical microscopy, FTIR spectrometry, and cyclic voltammetry, the morphology, chemical structure, release mechanism, and antioxidant capacity of the released glutathione in simulated digestive fluids (gastric medium with pH=2 and intestinal medium with pH=7.4, without enzymes) were analyzed. The results showed the stability of the alginate microcapsules in digestive fluids and highlighted an increase in encapsulation efficiency with higher concentrations of encapsulated glutathione. Additionally, it was shown that sodium alginate-based microcapsules exhibit different swelling capacities depending on the pH and glutathione concentration, showing remarkable potential for controlled delivery of the active compound. The in vitro release study demonstrated more efficient release of glutathione in simulated intestinal fluid (SIF) than in simulated gastric fluid (SGF). The calculation of the electrochemical index using cyclic voltammetry demonstrated superior antioxidant activity of encapsulated glutathione compared to free glutathione. Correlating the DPPH inhibition percentage with the electrochemical index showed high Pearson coefficients both in SGF and in SIF, indicating a good correlation between DPPH or ABTS free radical species inhibition and electrochemical measurements. Therefore, sodium alginate and glutathione microcapsules show potential for developing efficient delivery systems for glutathione or other pharmaceutical compounds.

本文研究了用于口服谷胱甘肽（GSH）的海藻酸钠微胶囊的制备和理化特性，谷胱甘肽是一种抗氧化的重要内源性抗氧化剂。利用光学显微镜、傅立叶变换红外光谱法和循环伏安法等多种方法，分析了释放的谷胱甘肽在模拟消化液（pH=2 的胃培养基和 pH=7.4 的肠培养基，不含酶类）中的形态、化学结构、释放机制和抗氧化能力。结果表明，海藻酸盐微胶囊在消化液中的稳定性很好，而且随着封装谷胱甘肽浓度的增加，封装效率也会提高。此外，研究还表明，海藻酸钠微胶囊根据 pH 值和谷胱甘肽浓度的不同表现出不同的溶胀能力，显示出控制活性化合物输送的显著潜力。体外释放研究表明，谷胱甘肽在模拟肠液（SIF）中的释放效率高于模拟胃液（SGF）。利用循环伏安法计算的电化学指数表明，与游离谷胱甘肽相比，封装谷胱甘肽具有更强的抗氧化活性。在 SGF 和 SIF 中，DPPH 抑制率与电化学指数的相关性显示出较高的皮尔逊系数，表明 DPPH 或 ABTS 自由基抑制与电化学测量之间存在良好的相关性。因此，海藻酸钠和谷胱甘肽微胶囊具有开发谷胱甘肽或其他药物化合物高效递送系统的潜力。

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引用次数: 0

Reinforcement of electrocatalytic overall water splitting by constructing Mo-doped NiFe LDH/NiS heterostructure 构建掺杂钼的镍铁合金 LDH/NiS 异质结构，增强整体水分离的电催化性能

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-06 DOI: 10.1016/j.colsurfa.2024.135711

Zehui Liu , Jinzhao Huang , Feng Jiao , Ke Zhang , Guixin Zhao , Xiaolong Deng

Electrochemical water splitting is considered to be an environmentally friendly and efficient method of hydrogen production. NiFe LDH is a well-known electrocatalyst for oxygen evolution, yet its effectiveness in HER has been suboptimal. In this research, we created a Mo-NiFe LDH@NiS catalyst on carbon cloth via cation doping and heterointerface construction of NiFe LDH. The resulting Mo-NiFe LDH@NiS/CC showed remarkable HER activity. Furthermore, when used as a bifunctional electrode for overall water splitting, Mo-NiFe LDH@NiS/CC operated at a cell voltage of 1.58 V at a current density of 10 mA/cm² and exhibited outstanding durability. This study emphasizes the significant enhancement in HER and overall water-splitting efficiency of NiFe LDH achieved through Mo doping and heterostructure engineering, advancing its potential for effective water splitting applications.

电化学水分裂被认为是一种环保、高效的制氢方法。NiFe LDH 是一种著名的氧进化电催化剂，但其在 HER 中的效果一直不尽如人意。在这项研究中，我们通过阳离子掺杂和异质表面构建 NiFe LDH，在碳布上创建了 Mo-NiFe LDH@NiS 催化剂。所制备的 Mo-NiFe LDH@NiS/CC 显示出显著的 HER 活性。此外，在用作整体水分离的双功能电极时，Mo-NiFe LDH@NiS/CC 的电池电压为 1.58 V，电流密度为 10 mA/cm²，并表现出卓越的耐久性。这项研究强调了通过掺杂钼和异质结构工程实现的镍铁合金 LDH HER 和整体水分离效率的显著提高，从而推动了其在有效水分离应用方面的潜力。

引用次数: 0

The degradation of Sulfamethoxazole using a heterojunction photocatalytic membrane composed of Z-scheme LaFeO3/Ag3PO4@GO: Assessment of activity and degradation mechanisms 利用由 Z 型 LaFeO3/Ag3PO4@GO 组成的异质结光催化膜降解磺胺甲噁唑：活性和降解机制评估

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-06 DOI: 10.1016/j.colsurfa.2024.135733

Jing Wang , Zongxue Yu , Tianhong Zhao , Niandan He , Qiuyue Tan , Yulong Song , Yan Chen

We synthesized La-deficient LaFeO₃ through a simple hydrothermal method, enhancing the physicochemical properties and catalytic performance of the initial LaFeO₃. Subsequently, Ag₃PO₄ was grown on 0.7 LaFeO₃ using electrostatic deposition to obtain composite materials LA-1, LA-2, and LA-3 with different composite ratios, improving the transfer rate of photogenerated charge carriers and reducing impedance. By physically combining LA with GO, a photocatalytic membrane LAG was produced, effectively enhancing the stability and recyclability of the photocatalytic membrane. The photocatalytic membrane LAG-2 achieved an 80.4 % SMX degradation efficiency under neutral conditions, with a degradation rate of 76.5 % at pH=3. The retention rate for SMX was 82 %, with a flux of 106.2 L·m⁻² h⁻¹ bar⁻¹. Additionally, the flux for CIP reached 530.8 L·m⁻² h⁻¹ bar⁻¹, with a retention rate of 65.5 %. After six cycling experiments, the degradation rate of LAG-2 was 67.4 %, and the leaching concentration of iron ions exhibited good performance. SEM analysis reveals that the morphology of the membrane remains intact before and after the cycle, with LAG retaining its integrity and exhibiting excellent mechanical properties. This indicates that the photocatalytic membrane demonstrates good stability and reusability. The excellent integration of the photocatalyst and membrane overcomes the challenge of difficult recovery of the photocatalyst, promising extensive applications and providing new insights for the practical application of photocatalytic degradation of antibiotics.

我们通过简单的水热法合成了缺La的LaFeO3，提高了初始LaFeO3的理化性质和催化性能。随后，利用静电沉积法在 0.7 LaFeO3 上生长 Ag3PO4，得到了不同复合比的复合材料 LA-1、LA-2 和 LA-3，提高了光生电荷载流子的转移率，降低了阻抗。通过将 LA 与 GO 物理结合，制备出光催化膜 LAG，有效提高了光催化膜的稳定性和可回收性。光催化膜 LAG-2 在中性条件下的 SMX 降解效率达到 80.4%，在 pH=3 时的降解率为 76.5%。SMX 的保留率为 82%，通量为 106.2 L-m-2 h-1 bar-1。此外，CIP 的通量达到 530.8 L-m-2 h-1 bar-1，保留率为 65.5%。经过六次循环实验后，LAG-2 的降解率为 67.4%，铁离子浸出浓度表现良好。扫描电子显微镜分析表明，循环前后膜的形态保持完好，LAG 保持其完整性并表现出优异的机械性能。这表明光催化膜具有良好的稳定性和可重复使用性。光催化剂与膜的完美结合克服了光催化剂难以回收的难题，有望得到广泛应用，并为光催化降解抗生素的实际应用提供了新的见解。

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引用次数: 0

Insights into surrogate respiratory droplet behaviour on inclined surfaces: Implications for disease transmission 对倾斜表面上代用呼吸道飞沫行为的认识：对疾病传播的影响

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-06 DOI: 10.1016/j.colsurfa.2024.135731

Abdur Rasheed , Jason Joy Poopady , Dipshikha Chakravortty , Saptarshi Basu

Disease transmission via fluid ejections from infected individuals presents a significant public health challenge. The ejected droplet frequently lands on substrates with varying orientations, including horizontal, vertical, and inclined. However, the behaviour of disease-causing droplets on inclined substrates remains unexplored. Recent research has demonstrated that droplet evaporation, flow, and colloidal deposition are significantly altered when surfaces are inclined. Changes in contact angle impact evaporative flux and induce flow between the top and bottom edges of the droplet. This study examines the behaviour of simulated respiratory droplets containing NaCl, mucin, and micrometer-sized particles as pathogen surrogates, focusing on substrate inclinations of 0°, 45°, and 90° on glass surfaces. As respiratory droplets evaporate, their solute concentration rises, altering both surface tension and viscosity. The study explores the coupled effects of solute concentration variations and asymmetric evaporative flux at varying relative humidity conditions and droplet volumes. The presence of salt and mucin induces Marangoni flow, potentially altering evaporation, flow patterns, and deposition dynamics. Additionally, sedimentation flow influences crystal nucleation sites and precipitation patterns. Results reveal unprecedented crystallization dynamics on inclined substrates, with notable differences in nucleation and growth based on the angle of inclination. Optical profilometry and confocal microscopy further show that surrogate bacterial particles accumulate excessively at the bottom edge of inclined droplets, suggesting an elevated risk of pathogen survival on inclined fomites. These findings highlight the critical importance of considering substrate orientation in understanding the transmission of disease through surface-bound droplets, offering insights that could inform public health strategies.

通过受感染者喷出的液体传播疾病是一项重大的公共卫生挑战。喷射出的液滴经常落在不同方向的基质上，包括水平、垂直和倾斜。然而，致病液滴在倾斜基质上的行为仍有待探索。最新研究表明，当表面倾斜时，液滴的蒸发、流动和胶体沉积都会发生显著变化。接触角的变化会影响蒸发通量，并引起液滴上下边缘之间的流动。本研究以玻璃表面 0°、45° 和 90°的基底倾斜度为重点，考察了含有氯化钠、粘蛋白和微米大小颗粒作为病原体替代物的模拟呼吸液滴的行为。随着呼吸液滴的蒸发，其溶质浓度会上升，从而改变表面张力和粘度。该研究探讨了在不同相对湿度条件和液滴体积下，溶质浓度变化和非对称蒸发通量的耦合效应。盐和粘蛋白的存在会诱发马兰戈尼流，从而可能改变蒸发、流动模式和沉积动力学。此外，沉积流还会影响晶体成核点和沉淀模式。研究结果揭示了倾斜基底上前所未有的结晶动态，根据倾斜角度的不同，晶体的成核和生长也存在明显差异。光学轮廓仪和共聚焦显微镜进一步显示，代细菌颗粒在倾斜液滴的底部边缘过度聚集，表明病原体在倾斜基质上存活的风险增加。这些发现凸显了在了解疾病通过表面结合液滴传播时考虑基质取向的极端重要性，为公共卫生策略提供了启示。

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引用次数: 0

Application of semi-IPN network superhydrophilic membranes prepared on the basis of metal net for efficient oil-water separation, emulsion separation 基于金属网制备的半 IPN 网络超亲水膜在高效油水分离和乳液分离中的应用

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-05 DOI: 10.1016/j.colsurfa.2024.135718

Yuxuan Zhang, Zaosheng Lv, Guangli Chen, Yuhang Liu, Yang Lei, Yanfen Huang

Hydrogel, a common hydrophilic material, is often used in wastewater treatment. In order to expand the application of hydrogel in superhydrophilic coatings, we chose acrylic acid (AA) and methacryloyloyloxy ethyltrimethylammonium chloride (DMC), two chemical materials commonly used in wastewater treatment, and semi-interpenetrating networks (semi-IPN) based on the metal mesh structure were successfully polymerization, and a superhydrophilic membrane (PAA/PDMC@SSM(stainless steel mesh)) was prepared. The membrane ensures the efficient separation of different types of oil-water mixtures under high flux conditions (up to 99 % separation efficiency) and the effective removal of oil from water-in-oil emulsions. This green polymer material can be used for efficient oil-water separation as well as separation of water-in-oil emulsions (separation efficiency close to 98 %). In order to prevent microorganisms from clogging the separation membrane during wastewater treatment, it was tested for E. coli with 99 % inhibition. PAA/PDMC@SSM was found to be acid-resistant, durable and self-cleaning for viscous oils.

水凝胶是一种常见的亲水材料，常用于废水处理。为了拓展水凝胶在超亲水涂层中的应用，我们选择了丙烯酸（AA）和甲基丙烯酰氧乙基三甲基氯化铵（DMC）这两种常用于废水处理的化学材料，并成功聚合了基于金属网结构的半互穿网络（semi-IPN），制备了一种超亲水膜（PAA/PDMC@SSM（不锈钢网））。该膜可确保在高通量条件下高效分离不同类型的油水混合物（分离效率高达 99%），并能有效去除油包水型乳液中的油。这种绿色聚合物材料可用于高效的油水分离以及油包水型乳状液的分离（分离效率接近 98%）。为了防止微生物在废水处理过程中堵塞分离膜，对大肠杆菌进行了测试，抑制率达到 99%。研究发现 PAA/PDMC@SSM 具有耐酸性、耐久性和粘性油的自清洁性。

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