RSC Advances
·
2014
·Vol. 4
·期 52
·27381-27388
·
IF 3.708
Bowen Wang,Shuxi Chen,Jun Nie,Xiaoqun Zhu
Superfine copper nanoparticles were synthesized through direct photoreduction of a high concentration of copper ions in an ethanol solution with a photoinitiator at room temperature in the presence of polyethylene imine (PEI). This synthetic method was very effective in decreasing the effect of copper ion concentration on copper particle size. The reaction process was monitored using UV-vis spectroscopy, and the obtained copper nanoparticles were investigated using transmission electron microscopy. The results show that PEI acted not only as a coordinating agent to the copper ion, but also as a polymer cage that reduced the chance of copper nanoparticle aggregation.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 85
·81913-81923
·
IF 3.289
Jianbin Qin,Guangcheng Zhang,Zhonglei Ma,Jiantong Li,Lisheng Zhou,Xuetao Shi
Shear thickening fluids (STFs) are energy dissipative materials and affected significantly by the properties of the dispersing media. Most of the dispersing media are polymeric or oligomeric fluids, and few studies have made ionic liquids (ILs) as the dispersing media. Since the properties of ILs are strongly dependent on its' ionic structures, the shear thickening behavior of STFs composed of ILs must be influenced by the ionic structures. The rheology and viscoelasticity of STFs of hydrophilic silica nanoparticles in ILs with different ionic structures were investigated systematically. The experimental results demonstrated that the dispersions in hydrophilic ILs displayed shear thickening behavior, while dispersions prepared by hydrophobic ones appeared as a colloidal gel and displayed shear thinning. With changing the length of the alkyl chain substituent on the organic cation, the shear thickening behavior was transformed. Shear thickening behavior was enhanced for the introduction of hydroxyl on the organic cation. Ionic structures influence the interactions between silica nanoparticles and ILs through the hydrogen bonds, and the shear thickening behavior may be induced by the formation of nanoparticle aggregation. The dynamic stabbing resistance, quasi-static tensile strength and conductivity of Kevlar fabric composites treated by STFs composed of ILs were enhanced observably, and the electromagnetic shielding property was improved to a certain degree.
研究领域:
材料科学
·
化学工程
·
流变学
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 29
·e02906
·
IF 2
Haojun Zhang,Gengrui Zhao,Shaoting Ma,Bin Zhang
Graphical A novel method enhances triboelectric nanogenerator (TENG) output by using La-doped bismuth ferrite nanoparticles as the triboelectric layer filler. Under the filler concentration threshold, the output performance of the TENG with 1.5 wt% La-doped BFO fillers is significantly enhanced compared to that with undoped BFO fillers. Additionally, a self-powered anticorrosion system is developed using this TENG as the energy source. Incorporating high-permittivity nanoparticles as fillers into triboelectric layers is an effective strategy to enhance the output performance of triboelectric nanogenerators (TENG). However, exceeding the critical filler concentration threshold causes nanoparticle aggregation, limiting further output performance enhancement of TENG. Here, a novel approach is proposed to enhance TENG output performance by doping lanthanum (La) into bismuth ferrite (BFO), forming La-doped BFO nanoparticle fillers (BLFO) to further improve the output performance of polyvinylidene fluoride (PVDF)-based TENG without increasing filler concentration. This approach overcomes the limitation of nanoparticle aggregation at high filler loadings while significantly enhancing the output performance of TENG. Below the critical concentration threshold, the dielectric constant of BLFO/PVDF composites increases by 32% compared to undoped BFO/PVDF composites. Consequently, the BLFO/PVDF-based TENG achieves a high output voltage of 329 V and short circuit current of 44 µA, representing 43% and 69% increases over the BFO/PVDF-based TENG, respectively. Notably, these values represent 219% and 193% increases compared to the pure PVDF-based TENG. Furthermore, a self-powered anticorrosion system powered by the BLFO/PVDF TENG demonstrates effective metal protection, as evidenced by open-circuit potential measurements and reduced average corrosion rates.
研究领域:
能量收集
·
材料科学
·
纳米技术
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电化学
·
防腐保护
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Huanhuan Bao,Meifang Yuan,Chengui Xiao,Daofeng Liu,Weihua Lai
A signal-enhanced LFIA based on tyramine (TYR)-induced AuNPs aggregation has been developed for the sensitive detection of danofloxacin (DAN). In the model, the hydroxyl radical produced by HRP catalyzing H 2 O 2 can trigger the TYR-AuNPs to aggregate on the T or C line for enhancing the detection signal. The linear range of TYR-AuNPs LFIA was 0.25–5 ng mL −1 with the limit of detection (LOD) of 0.032 ng mL −1 , and the LOD was 8-fold lower than that of the traditional AuNPs LFIA (0.26 ng mL −1 ). The TYR-AuNPs LFIA could be used with the naked eyes to qualitatively detect DAN with a cut-off limit of 2.5 ng mL −1 , which was 4-fold lower than that of the traditional AuNPs LFIA (10 ng mL −1 ). The recoveries of TYR-AuNPs LFIA were 86.04–105.14% and 92.41–110.19%, with the coefficient of variation of 1.71–2.05% and 4.42–5.89% in chicken and pork, respectively.
研究领域:
分析化学
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纳米技术
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
AIP Advances
·
2024
·Vol. 14
·期 5
·
IF 1.4
Yang Changfeng,Zhang Bowen,Lin Xiaoqian,Han Qinglin,Bao Hongze,Liu Yan
Concentration plays an essential role in generating hydroxyl radicals in irradiated nanoenhancer suspensions. In this paper, we used coumarin-3-carboxylic acid as a hydroxyl radical-specific probe to investigate the hydroxyl radical production of different concentration nanodiamonds (NDs) and CeO 2 NPs in phosphate-buffered saline under x-ray irradiation. NDs significantly enhanced hydroxyl radical production, and the maximum enhancement of hydroxyl radical production was observed at a concentration of 10 µ g/ml, with an enhanced factor of 1.398 ± 0.262. CeO 2 NPs can increase and scavenge hydroxyl radicals at different concentration ranges, with the lowest and highest enhanced factors of 0.623 ± 0.069 and 1.738 ± 0.264, respectively. We tested the hydrodynamic diameter at various concentrations to explore the concentration effect further. We found that with increasing concentration, there might be factors, such as hydroxyl radical recombination and nanoparticle agglomeration, that lead to changes in the enhancement factor. Based on the data from previous and present studies, the experimental results indicate that the concentration factor is essential for hydroxyl radical generation in nanoenhancer suspensions under ionizing radiation. We also provide possible mechanisms for enhancing hydroxyl radical production by nanoenhancers in water under ionizing radiation and the decrease in enhancement factor at high concentrations of nanoenhancers.
研究领域:
辐射化学
·
纳米技术
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Siyuan Yu,Tianyong Zhang,Jinfeng Xing
Herein, a facile method combining in-situ generation of potassium oleate (KOA) and miniemulsion photopolymerization under green LED irradiation was proposed to prepare poly(methylmethacrylate) (PMMA) nanospheres . A miniemulsion containing methyl methacrylate (MMA) was prepared in situ, in which KOA as a surfactant was synthesized by the neutralization reaction of oleic acid (OA) and potassium hydroxide (KOH), and then miniemulsion photopolymerization occurred to obtain PMMA nanospheres under green LED irradiation. Emulsion stability test proved that the in-situ surfactant miniemulsion has higher stability than the preformed surfactant miniemulsion. The effect of surfactant amount and exposure time on photopolymerization was investigated. Furthermore, hexadecane (HD) and polyvinylpyrrolidone (PVP) were introduced into the polymerization system to avoid the adverse effect of Ostwald ripening and particle agglomeration respectively, and PMMA nanospheres with uniform sizes of ∼100 nm were finally prepared.
研究领域:
高分子科学
·
材料科学
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纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Haiyun Tang,Shujuan Yang,Jie Chang,Xinyu Zhao,Junhao Huang,Gaobo Yu,Yuhong Feng,Xueqing Zhou,Jiacheng Li
Incorporating antioxidants into the soft colloidal emulsifiers has been necessarily required to prepare antioxidant Pickering emulsions . Establishing interfacial properties-physical and chemical properties relationships has not been deeply explored by a comprehensive multiscale approach. Herein, the polysaccharide composite nanoparticles acted as antioxidants interface-anchored reservoirs were designed via non-covalent interaction between hydroxypropyl chitosan (HPCS), sodium alginate (Alg) and purple corn bracts anthocyanins (PCBA) at the molecular level. The orderly packing HPCS-Alg/PCBA composite nanoparticles formed the more highly-dense adsorption layers at oil/water interfaces at the microscopic level. With increasing the PCBA concentration, the bridged network particle aggregates between neighboring droplets resulted in a smaller size at the mesoscopic level and higher bulk stability at the macroscopic level. Interestingly, the bridged structures formed stronger antioxidant shells around dispersed droplets, further improving oxidative stability. These results highlighted the characteristics of the interfacial layers (thickness, strength , and viscoelasticity) that could be engineered to regulate the oxidation stability of Pickering emulsions at different scales. Therefore, this work proposed a novel strategy to protect lipid droplets of emulsions via manipulating the antioxidative soft colloidal particle's interfacial properties in the Pickering emulsions system, further extending the applications of antioxidant Pickering emulsions in food colloidal fields.
研究领域:
胶体科学
·
食品化学
·
材料科学
·
物理化学
✓ 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）