COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Jiyao Xu,Lili Sun,Xiangjun Guo,Hongmei Zhang,Xihui Zhao
Green, blue and pink fluorescent carbon dots (o/m/p-CDs) were prepared by one-step hydrothermal method with three isomers (o/m/p) of phenylenediamine as nitrogen and carbon sources and ethanol as solvent. The obtained carbon dots exhibited different luminescence behaviors, and the luminescence behaviors were affected by solvent and pH. More interestingly, m-CDs exhibited obvious discoloration behavior under different pH conditions and had excellent linear relationship under acidic and basic conditions, respectively. Furthermore, we combined m-CDs with test paper, PVA film, and cotton fabric, respectively, to prepare composites for visual pH detection. The as-prepared composite material has excellent visual detection effect for a small amount of test sample (<5 μL) in the fine pH range (0.5 unit), and could be applied to trace pH detection.
研究领域:
材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2015
·Vol. 36
·期 6
·533-537
·
IF 4.941
Hao Meng,Jing Zheng,Xiufang Wen,Zhiqi Cai,Jiawei Zhang,Tao Chen
A simple strategy is provided to construct a novel pH- and sugar-induced shape memory hydrogel based on dynamic phenylboronic acid (PBA)–diol interactions formed by PBA-modified sodium alginate (Alg-PBA) and poly(vinyl alcohol) (PVA). The dynamic PBA–diol ester bonds serve as temporary cross-links and stabilize the deformed shape of the hydrogel. The disassociation of the PBA–diol ester bonds is explored in acidic conditions and aqueous solutions of glucose and fructose, which endow the hydrogel with shape memory performances.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2023
·
IF 8.1
Chen Cheng,Zongcai Tu,Hui Wang
The aim of this study was to investigate the phase behavior and structural properties of fish gelatin complex coacervation with carboxylated chitosan as a function of pH by varying the amount of carboxylated chitosan added (0–0.25%, w/v) while keeping the fish gelatin concentration constant at 0.667% (w/v). Zeta potential indicated that electrostatic interaction drove the complex coalescence of fish gelatin and carboxylated chitosan to form soluble or insoluble complexes. The turbidity of the fish gelatin-carboxylated chitosan complex system was greatest at a carboxylated chitosan concentration of 0.2%. UV and fluorescence spectroscopy indicated that the carboxylated chitosan changed the tertiary conformation of fish gelatin. Circular dichroism showed that complexation of fish gelatin with carboxylated chitosan resulted in a shift from the α-helix to the β-sheet structure of fish gelatin. In particular, at pH 5, the fish gelatin complexed with carboxylated chitosan had a disordered structure. X-ray diffraction and scanning electron microscopy of the composite coacervates both investigated that electrostatic interaction between the two replaced molecular interaction within the carboxylated chitosan to form a new lamellar porous structure. These findings may in future enable the use of fish gelatin-carboxylated chitosan complex systems in the design of new food matrices.
研究领域:
食品科学
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生物化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2014
·
IF 4.908
Yuzhang Zhu,Wei Xie,Jingye Li,Tieling Xing,Jian Jin
Membrane technology has been considered as one of the most efficient methods to treat oil contaminated water. However, due to serious fouling caused by oil droplets absorption, the development of membrane technology is impeded in treating oily wastewater. We report in this work the fabrication of a pH-induced non-fouling membrane by grafting hyperbranched poly (ethylene imine) (PEI) onto PVDF/polyacrylic acid grafted PVDF blend membrane for effectively separating viscous soybean oil-in-water emulsion. The membrane exhibits an ultralow oil-adhesion and thus displays a superior antifouling performance in acidic condition so that it maintains a stable flux for long-time permeating. Meanwhile, the PEI grafted blend membrane behaves an excellent permeating performance with high flux and high separation efficiency. It shows a promising potential for treating oil-contaminated wastewater produced by various industrial processes, especially for acidic oily wastewater treatment .
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 4
·647-653
·
IF 3.1
Li Miao,Hao Yashi,Yang Zuobo,Yun Jimmy,Liang Xin
Ruthenium(Ru) and its derivatives have been widely studied as oxygen evolution reaction(OER) electrocatalysts in acidic water electrolysis due to their inherent electronic properties and high oxygen evolution activity. A facile pH-induced size regulation approach for Ru nanocrystals has been developed by introducing NaOH and CH 3 COOH in a polyol system. The size of Ru particles decreases with the increase of the dosage of NaOH and increases at a certain dosage of CH 3 COOH. The formation mechanism of ruthenium nanocrystals was investigated through a series of characterizations and kinetic experiments. The electrocatalytic activities of the electrocatalysts derived from these Ru particles were studied toward OER to investigate the influence of particle size on their electrocatalytic properties. Moreover, the prepared electrocatalysts were applied as anodic materials in the proton exchange membrane(PEM) electrolysis cell and demonstrated excellent performance.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Huayu Xiong,Wei Wang,Jichao Liang,Wei Wen,Xiuhua Zhang,Shengfu Wang
Herein, we report a convenient approach to purify water-soluble bovine serum albumin (BSA)-capped metal nanoclusters by pH-induced precipitation under acidic conditions. The fluorescence of metal nanoclusters could be completely recovered upon the re-dispersion of nanoparticles into basic media. BSA metal nanoclusters have been prepared to monitor pH at highly acidic medium. When pH decreased, the fluorescence of the nanoclusters under a UV lamp decreased and completely disappeared after pH 4. And a fluorescent pH sensor for pH monitoring has been developed based on the “OFF–ON” signal switch of the gold clusters agarose hydrogel.
研究领域:
材料科学
·
生物化学
·
分析化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Yanchun Wan,Huilin Yi,Yujun Wang,Guangsheng Luo
A novel and effective method is proposed to prepare uniform γ-alumina microspheres with large pore volumes using a coaxial microchannel. In this process, the so-called “temperature/pH-induced gelation” method, in which methylcellulose (MC) and hexamethylenetetramine (HMTA) are added to accelerate gelation of Al(OH)3 sol, is combined with microfluidics technology to ensure sphericity and dimensional homogeneity of the prepared microspheres. The influences of the sol concentration, the properties of pseudoboehmite (PB) used to obtain the sol, and the two-phase flow rates were investigated. By controlling the sol concentration at 10 wt % and the continuous to dispersed phase flow ratio at 14–50, 750–380-μm-diameter γ-alumina microspheres with uniform pore structures were synthesized using an Al(OH)3 sol obtained from PB3. The pore volume was 1.20 mL/g, and the crushing strengths were 8.19–16.67 N/mm2. Prepared at the maximum two-phase flow ratio, sample S9 exhibited the most uniform particle size of about 380 μm.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2021
·
IF 1.82
Long Feng,Yimiao Hou,Qingqing Hao,Mingxing Chen,Shuo Wang,Xuemin Hu,Wenxiu Yang
The deterioration of water ecology caused by the discharge of oil spill wastewater, industrial sewage, and municipal sewage has attracted wide attention worldwide. Thus, it is significant to design a simple, environmentally friendly approach to separate oil–water mixtures. In this work, three different fabrics with pH-induced wettability transition were prepared by a dip-coating process for oil and water separation. The dip-coating fabrics had the advantages of oil–water separation, photocatalytic degradation, and recycling. Polyethylene terephthalate/polyamide nonwoven fabric was used as the substrate materials of the fabric. The carboxylic acid-modified TiO2 endowed the fabric with hydrophilicity–hydrophobicity and photocatalytic properties. The Fe3O4 nanoparticles obtained by the coprecipitation method provided magnetism for the fabric, facilitating the recycling of the fabric and improving the hydrophobicity of the fabric. The fabrics coated with dipping solutions were superhydrophobic in a neutral environment and hydrophilic in an alkaline environment. Among the three coated fabrics, the fabric coated with stearic acid/TiO2-Fe3O4 (FST) had the most satisfying oil–water separation performance and durability. Under the neutral condition, the contact angle of the FST was 151° and the separation efficiency was 98%. Under the alkaline condition, the underwater oil contact angle of the FST was 150° and the separation efficiency was 95%. After 15 cycles, the oil–water separation rate of the FST was still higher than 90%. Due to the presence of TiO2, the coated fabric had an exceptional performance in the photodegradation of organic pollutants (69.9%). In addition, the fabrics can be quickly recovered due to magnetism.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2023
·
IF 4.3
Xiang Jing-Yuan,Zhang Wen-Long,Li He-Ting,He Ya-Ning
This work reported an AIE fluorescent probe for tumor imaging based on the pH induced self-assembly strategy. The fluorescent probe was composed of an acid-responsive soluble copolymer PEG- b -PAMA-DMMA with a maleic acid amide group and an anionic soluble aggregation-induced emission fluorogen (AIEgen) TPE-2SO 3 − . The polymer could be transformed into a protonated amine-containing polymer after the hydrolysis of maleic acid amide in acidic tumor microenvironment, which would be further self-assembled with TPE-2SO 3 − to form aggregated nanoparticles. The transition of TPE-2SO 3 − from dispersed state to aggregated state led to an obvious increase in fluorescence intensity due to its AIE characteristics.
研究领域:
材料科学
·
生物医学工程
·
癌症研究
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2016
·
IF 7.476
Huayu Xiong,Huiling Zheng,Wei Wang,Jichao Liang,Wei Wen,Xiuhua Zhang,Shengfu Wang
Herein, we report a convenient approach to purify water-soluble dihydrolipoic acid (DHLA)-capped Ag nanoclusters (Ag NCs) by pH-induced precipitation under acidic conditions. The fluorescence of Ag NCs could be completely recovered by re-dispersing the precipitate into a basic solution using DHLA and NaBH 4 as stabilizing ligands and etching reagent. DHLA-Ag NCs-doped agarose hydrogels have been prepared to monitor pH with a wide range from 8.0 to 4.0. When pH decreased, the fluorescence of the hydrogels under a UV lamp decreased and completely disappeared after pH 5. The DHLA-Ag NCs-doped agarose hydrogels biosensor showed low cytotoxicity and long stability. Accordingly, a fluorescent pH sensor for bacterial monitoring has been employed based on the “OFF–ON” signal switch of the Ag NCs-agarose hydrogel.
研究领域:
纳米技术
·
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2019
·Vol. 93
·期 2
·391-401
·
IF 1.986
Yi Huilin,Wan Yanchun,Zhang Yang,Wang Yujun,Fei Weiyang,Luo Guangsheng
This study describes a novel and facile route for fabricating highly uniform γ-alumina microspheres with controllable size, morphology, and pore structure by integrating the sol–gel route for alkoxide with “temperature/pH-induced gelation” in a coaxial microchannel. Taking advantage of the controllability of the microfluidic devices and Al–O–Al chains formed by the sol–gel route of aluminum alkoxide, the uniformity of the microspheres was assured, and the mechanical strength of the microspheres was greatly improved to 18–27 N/mm 2 . The effects of the continuous phase composition and two-phase flow rate on the size, morphology, and pore structure of the obtained microspheres were investigated. When triocylamine (TOA) was added to the continuous phase and the two-phase flow rate ratio was larger than 188, the as-prepared microspheres had a smooth surface and good sphericity; otherwise, the microspheres had poor spheriticy and included many ravines on the surface, which can be explained by the mutual influence of long-lasting movements of molecular chains resulted from low gelation speed and inner circulation of the droplets. Under different continuous phase compositions, the average pore diameter, pore volume, and specific surface area ranged from 7 to 12 nm, 0.89 to 1.58 mL/g, and 293.7 to 387.7 m 2 /g, respectively.
研究领域:
材料科学
·
化学工程
·
微流控技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2015
·
IF 9.312
Pengfei Zhan,Zhen-Gang Wang,Na Li,Baoquan Ding
Noble metal nanoparticles are promising materials for heterogeneous enantioselective catalysis because of their high surface-to-volume ratios, large concentrations of highly undercoordinated surface sites, and quantum confinement effects. In this work, we report on the use of DNA as an environment-responsive chiral ligand to engineer the selective catalytic behaviors of glucose oxidase-mimicking gold nanoparticles (AuNPs), with glucose enantiomers as the substrates. DNA can be stimulated externally to switch between random-coiled and multistranded structures (e.g., duplex, i-motif, or G-quadruplex). Random-coiled DNA-capped nanoparticles preferentially catalyze oxidation of l-glucose, and structured DNA-capped nanoparticles show higher activity toward d-glucose. pH-induced selectivity diminishment of DNA-treated AuNPs is also found, further demonstrating the chiral selector effect of DNA ligands. In the end, the selective catalysis of AuNPs allows control of the size enlargement of nanoparticles through self-catalytic Au0 deposition, in ligand- and substrate chirality-dependent manners. It is found that the effect of substrate chirality on the self-growth rate can be reversed by the hybridization of the capping DNA. The structural and chemical features of DNA grooves in the multistranded structures render binding sites with higher affinity to d-glucose than l-glucose. The results suggest a simple strategy for engineering the responsive enantioselective catalysis of metallic nanoparticles and advance the understanding of chiral interactions between nucleic acids and saccharide.
研究领域:
纳米技术
·
催化
·
生物化学
·
材料科学
✓ 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）