COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Miaolu He,Lei Wang,Yongtao Lv,Xudong Wang,Zhe Zhang,Qi Cui,Jiani Zhu
A thin-film composite (TFC) membrane with hydrophilic double-skinned support layer was developed to improve anti-fouling performance. The double-skinned separate casting technology was applied to obtain the double-skinned support layer and the polyacrylonitrile (PAN) concentration in the bottom casting solution was adjusted. Then, the support layer was carboxylated by immersing in a 1.5 M NaOH solution for 2 h. Finally, TFC membrane with hydrophilic double-skinned support layer was obtained by the interfacial polymerization. When the PAN concentration in the bottom casting solution was 10 wt%. TFC membrane with hydrophilic double-skinned support layer (TFC-10 %) showed the best performance. The water flux of TFC-10 % reached 17.6 LMH and the reverse salt flux was 5.6 gMH. Under the double interception effect of the double-skinned structure and the steric hindrance of the hydration layer on the support layer, good anti-fouling property of TFC-10 % was observed under bovine serum albumin (BSA) foulant. Compared to the traditional TFC membrane, the normalized flux of TFC-10 % increased by 80 %. The anti-fouling performance was also analyzed by microaction mechanisms using AFM and QCM-D. It was found that the adhesion force between TFC-10 % and BSA was small, therefore fewer pollutants were adsorbed on TFC-10 %, and its adsorption layer was loose and easy-cleaning.
研究领域:
膜科学
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水处理
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
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2022
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IF 11.504
Zhenyu Yang,Lei Dai,Qingjie Sun,David Julian McClements,Xingfeng Xu
Previously, it has been shown that rice glutelin with a degree of hydrolysis of 2% (DH2) can form stable oil-in-water emulsions, but the stabilization mechanism has not yet been elucidated. In this study, the molecular, interfacial, and emulsifying properties of DH2 were investigated to better understand the structure-function relationships of this emulsifier. Peptides with relatively small (<5 kDa), medium (5–10 kDa), and large (>10 kDa) molecular weights were separated from DH2 by ultrafiltration . The large and medium peptides exhibited the highest surface hydrophobicity and intrinsic fluorescence intensity, respectively. Dynamic interfacial tension and quartz crystal microbalance with dissipation (QCM-D) analysis was utilized to characterize the interfacial properties. The large peptides exhibited a faster adsorption rate and a greater reduction in interfacial tension than the others. QCM-D indicated that the properties of the interfacial layers formed by the peptides were different during adsorption or desorption for all samples. The properties of the emulsions formed using the different peptides were characterized by confocal laser scanning microscopy, particle size, flocculation index, and coalescence index analysis. The storage stability of the emulsions increased as the molecular weight of the peptides used to coat the oil droplets increased, which may have been due to an increase in the steric repulsion caused by thicker interfacial layers. These results indicate that the large peptides in DH2 play the most important role in forming and stabilizing emulsions. This knowledge may be used to increase the utilization of hydrolyzed rice proteins as plant-based emulsifiers in foods and beverages.
研究领域:
食品科学
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胶体科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2023
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IF 9.5
Lei Gao,Donghui Kou,Wei Ma,Shufen Zhang
Due to the large specific surface area and continuous pores in structures, metal–organic frameworks (MOFs) show great advantages in the adsorption of volatile organic compounds (VOCs). Photonic crystal (PC) sensors derived from MOFs are promising for the visual detection of VOC gases. However, they still have problems of low sensitivity and poor color saturation and tunability. Here, inspired by vapor-sensitive scales of Tmesisternus isabellae beetle and scattering light absorption of polydopamine, a porous one-dimensional PC sensor is constructed by combining ZIF-8 with TiO2@PDA nanoparticles. The PC sensor shows significant color changes under different concentrations of benzene vapor and reaches a detection limit of 0.8 g/m3. It has a response time of less than 1 s and maintains stable optical performance after 100 times of reuse. Moreover, ZIF-67 and ZIF-7 are both incorporated into the PCs for comparison; it reveals that ZIF-8 shows superior benzene detecting property. Additionally, the synergistic adsorption of VOCs in inner and outer holes of the ZIF-8 layer is demonstrated by real-time mass monitoring with quartz crystal microbalance with dissipation. This study provides a valuable reference for the fabrication of high-quality MOF-based PC sensors and sensing mechanism study between microscopic molecular adsorption and macroscopic performance.
研究领域:
材料科学
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化学传感器
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纳米技术
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Xinyu Zhao,Qu Zeng,Shujuan Yang,Furui He,Wenqi Qin,Zhaojun Wang,Keyang Mai,Gaobo Yu,Junhao Huang,Jiacheng Li,Yuhong Feng
Encouraged by the strategy of increasing efficiency and reducing pesticide overuse, the development of polymer/surfactant as additives to enhance pesticide droplet deposition on hydrophobic leave is a promising project. Herein, Alginate-based supra-amphiphiles (SAs), host–guest self-assembled by host amphiphilic cyclodextrin-functionalized alginate derivative (Alg-CD) and guest azobenzene-based surfactant (Azo-DEMA), performed comprehensive characteristics, which integrated the viscosity effect and the ability to reduce surface tension. SAs enabled oil-in-water pesticide droplets to inhibit splashing and light-regulate wetting, thereby enhancing droplets deposition. By analyzing the impact dynamics of loaded-pesticide o/w droplets on hydrophobic surface, the addition of SAs rapidly afforded the pinning ability of droplets with the target surface, and in turn, resulted in inhibiting splashing. Afterward being exposed to UV light, the resulting SAs o/w droplets undergone disassembly so as to release small-molecular surfactant and reduce the surface tension of droplets for improving droplets’ wettability. Importantly, quartz crystal microbalance with dissipation monitoring (QCM-D) was skillfully used for revealing the interaction mechanism between droplets and the waxy layer of hydrophobic surface, finding that SAs could form compact conformation on the waxy surface, while disassembled SAs undergoing UV irradiation exhibited the large adsorption amount and stronger interaction with waxy layer. Consequently, the herbicidal activity experiments exhibit sensitive pesticide control effects assessed under UV even natural sunlight. Light-regulating host–guest interfacial interaction of polysaccharide-based supra-amphiphiles may provide a novel, eco-friendly and feasible manner for comprehensive pesticide applications.
研究领域:
材料科学
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化学
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农业科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）