COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Fan Wang,Hang Luo,Di Zhai,Zhida Xiao,Li Zeng,Xueying Wang,Zhitao Hu,Huan Wang,Lihong Liu,Dou Zhang
Dielectric capacitors consisting of ceramic/polymer nanocomposites have been widely used in electrical and electronic fields due to the advantages of high power density, high stability and improved energy density . However, the mismatching of dielectric constant between ceramics and polymers seriously limits the improvement of energy density of dielectric capacitors. In this work, a novel kind of core-double shell structured ceramic filler BaTiO 3 @TiO 2 @SiO 2 (BT@TO@SO) is prepared by a two-step hydrolysis method and introduced into PVDF for high performance dielectrics. This core-double shell structured filler forms multi-layer interface with gradually reduced dielectric constants of BT, TO, and SO, which is beneficial to enhance the interface polarization and reduce the electric field concentration caused by dielectric mismatch. In addition, the high insulating properties of the outer layer of SO can greatly limit the electron migration and reduce the leakage current. The experimental results show that when the loading of BT@TO@SO filler is low, the nanocomposite can achieve an energy density of up to 19.7 J/cm 3 and an efficiency of 57.6% at 620 MV/m, which shows an obvious improvement compared with filling BT or BT@SO. The results of finite element analysis further verify the superiority of this core-double shell structure.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Guangyu Wang,Shaoguo Wen,Suping Qian,Jihu Wang,Changrui Wang,Yabo Chen
SiO 2 /TiO 2 composites were fabricated from KH-570 modified nano-titanium dioxide and nano-silica. The waterborne nano-hybrid hyperbranched acrylic emulsion was synthesized by in-situ polymerization using waterborne acrylic acid as the auxiliary anti-corrosion material. The SiO 2 /TiO 2 composites were characterized by Fourier transform infrared spectroscopy, thermogravimetic analysis, and X-ray photoelectron spectroscopy. The structure and morphology of the waterborne nano-hybrid hyperbranched acrylic emulsion were characterized by scanning and transmission electron microscopies. Waterborne nano-hybrid hyperbranched coating based on waterborne nano-hybrid hyperbranched acrylic emulsion. The anti-corrosion properties of the waterborne nano-hybrid hyperbranched acrylic coating were characterized by potentiodynamic polarization and electrochemical impedance spectroscopy. In salt-spray and wet adhesion tests, the waterborne nano-hybrid hyperbranched coating demonstrated an excellent anti-corrosion effect and the salt spray resistance exceeded 1000 h. In this paper, a novel environmentally friendly waterborne nano-hybrid hyperbranched acrylic emulsion was synthesized by in-situ polymerization method, and the corrosion resistance test proved that the resin has excellent anti-corrosion performance. It has certain application value in metal protection.
研究领域:
材料科学
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腐蚀与防护
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2014
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IF 3.583
Chenghui Li,Xue Jiang,Xiandeng Hou
Nano-SiO 2 was immobilized on the inner wall of a dielectric barrier discharge (DBD) tube, and it was coupled to a conventional gas chromatographer to investigate its performance as a molecular emission spectrometric detector for the determination of five volatile aliphatic amines. A charge-coupled device (CCD) was applied to observe the nano-SiO 2 -enhanced molecular emission spectra. The characteristic molecular emission bands of volatile aliphatic amines at 326.5 nm, 336.0 nm and 388.3 nm can be clearly resolved from the background emission spectra of carrier gas argon. The emission band of CN at 388.3 nm was used for quantitative detection of volatile aliphatic amines due to its high sensitivity. Nanomaterial catalysts including TiO 2 , MnO 2 , SiO 2 and ZnO were tested to enhance the emission signal of amines, and SiO 2 shows the best performance. The factors that influence the emission signal, such as discharge voltage, inner electrode length and carrier gas flow rate , were investigated in detail. The analytical performance of this method was evaluated by separation and detection of the mixture of five volatile aliphatic amines. Under the optimal experimental conditions, the limits of detection were found to be 4.4, 2.5, 2.2, 1.8 and 2.4 μg for dimethylamine , trimethylamine , n-butylamine, cyclohexylamine and ethylenediamine , respectively. This GC detector is not only sensitive but also fast in response to volatile aliphatic amines with good stability. Trimethylamine in a carp fish sample was monitored with storage time by the proposed method.
研究领域:
分析化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2024
·
IF 3.8
Qian Zhao,Lulu Zhao,Yuefei Zhang,Wei Chen,Sheng Tang
Hydrogels with a unique three-dimensional network structure have been widely used in a variety of fields. However, hydrogels are prone to swelling under water-rich conditions, which severely limits their application in liquid chromatography . Therefore, producing a hydrogel with reliable performance and good mechanical property is essential. Smart temperature-sensitive chromatographic packings have attracted extensive attentions in recent years. In this work, sodium 4-styrenesulfonate and 1-octadecene were introduced into the poly( N -isopropylacrylamide) hydrogel to improve mechanical property and separation performance. As a consequence, a smart temperature-sensitive terpolymeric hydrogel modified silica stationary phase (ION-hydrogel@SiO 2 ) was synthesized for multimode liquid chromatographic separation. It was found that this new ION-hydrogel@SiO 2 column exhibited excellent chromatographic separation ability for a wide range of analytes. To a certain extent, this new column has a higher chromatographic separation efficiency compared to the commercial C18 column and XAmide column. Moreover, the use of low proportion of organic phase in chromatographic separation is conducive to the realization of green chromatography. By investigating the chromatographic separation mechanism, it has been demonstrated that the hydrogen bonding interaction is primarily responsible for the temperature-sensitive behavior of the hydrogel. Finally, the ION-hydrogel@SiO 2 column was used for the determination of pyridoxine in the commercially available tablet samples. In conclusion, this study presents a feasible idea for the development of novel copolymer hydrogels as liquid chromatographic stationary phases.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
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2025
·
IF 3.2
Dan Wang,Yunhong Xie,Lingfan Xu,Yixuan Zhou,Kai Li,Zhongfeng Li
The development of bifunctional nanoplatform-based theranostics has garnered considerable attention in cancer therapy research. In this study, we engineer Gd2O3@SiO2-CuS nanorods as an integrated diagnostic-therapeutic system, simultaneously harnessing photothermal conversion and paramagnetic properties for MRI-assisted photothermal intervention. Hydrothermally synthesized Gd2O3 nanorods demonstrate superior T1-weighted contrast performance, achieving a longitudinal relaxivity (r1) of 4.2 mM–1·s–1, which compares favorably with that of commercial contrast agents. Furthermore, the strategically integrated CuS component exhibits remarkable photothermal conversion efficiency (19.6%) and sustained therapeutic stability. These attributes pave the way for achieving the application objective of magnetic resonance imaging-assisted photothermal therapy. Critically, comprehensive biosafety evaluations, including hemocompatibility assays and cytotoxicity profiling, confirm the nanocomposite’s favorable biocompatibility. The findings underscore the substantial potential of Gd2O3@SiO2-CuS nanorods for image-guided photothermal therapy applications.
研究领域:
医学影像学
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纳米医学
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癌症治疗
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2022
·
IF 7.693
Kailun Xia,Yue Gu,Linhua Jiang,Kai Lyu,Mingzhi Guo,Weizhun Jin
In surface treatment technics of cement-based materials, nanoSiO 2 (NS) is effective in refining pore structure while organic water-repelling agents are often used for producing a hydrophobic surface. Due to its advantages of pore refining effect and hydrophobicity, the organic-inorganic hybrid nanoSiO 2 has attracted increasing attention. However, the UV-irradiation can result in photodegradation of organic constituents, leading to deterioration of hydrophobicity. In this study, a novel UV-resistant fluorinated hybrid nanocomposite, NS@TOFS, was synthesized and used for surface treatment on hardened cement-based materials. The water and gas permeability of the treated samples before and after UV-aging were assessed by measuring the water absorption rate, water contact angle and carbonation degree. The experimental results showed that the NS@TOFS treated samples possess enhanced water and gas impermeability after 14 days of exposure to UV rays. A morphological observation of the treated surface revealed that a synergistic effect of organic film and refined pore structure was responsible for the improved surface properties. Findings from this study well demonstrate that the developed fluorinated hybrid nanoSiO 2 holds great promise for enhancing the durability of cement-based materials under UV-irradiations.
研究领域:
建筑材料学
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表面处理技术
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纳米材料科学
✓ 已验证
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
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2019
·
IF 3.074
Dongdong Yao,Ting Li,Yaping Zheng,Zhilin Zhang
In this study, a novel hybrid nanofluid, composed of a composite core of poly(2-dimethylamino ethyl methacrylate) microgel and silica (PDMAEMA/SiO 2 ) and a shell of polyetheramine (M2070), was fabricated via a combination of inversed emulsion polymerization , biomimetic silicification and grafting onto approach. Firstly, PDMAEMA microgel of ca. 300-nm diameter with good dispersity was prepared in water/cyclohexane system. Subsequently, walnut kernel-structured and solid spherical PDMAEMA/SiO 2 composites were fabricated using swollen and contractive PDMAEMA microgel as catalytic template, respectively. Then 3-(2, 3-epoxypropoxy) propyl trimethoxysilane (KH560) modified M2070 was grafted on PDMAEMA/SiO 2 composites to obtain two kinds of solvent-free PDMAEMA/SiO 2 @M2070 hybrid nanofluids with core@shell structure. Finally, the CO 2 gas adsorption performance of these nanofluids was investigated under different CO 2 pressure (0.5–4.5 MPa) at 25 °C. The results indicated that nanofluid with walnut kernel-structured core showed more excellent CO 2 adsorption capacity than solid spherical one. Moreover, it still displayed good stability over ten adsorption-desorption cycles.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
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2019
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IF 0
Su-Na Yin,Juan Liu,Defeng Wu,Su Chen,Weiwei Xia
As important biological functions of many creatures, structural colors and self-healing features play crucial roles in the survival of organisms. Inspired by these features, the intelligent self-healing colloidal photonic crystals (CPCs) materials with stable structural colors are constructed here by immobilizing magnetically assembling Fe3O4@SiO2 colloidal nanoparticles into a self-repairing hydrogel matrix. The self-repairing hydrogels, prepared by using biodegradable material poly(1-vinyl-2-pyrrolidinone-co-acrylamide) modified with O-carboxymethyl chitosan (O-CMC), exhibit an outstanding mechanical property with favorable toughness and elasticity. Interestingly, one-dimensional Fe3O4@SiO2 chain structures embedded in the framework can maintain the stability of the photonic band-gap structure and its resultant bright structural colors. Furthermore, O-CMC contained in the matrix can supply plentiful carboxyl, amino, and hydroxyl functional groups which can form abundant intermolecular hydrogen bonds, and thus give the robust self-healing capability to the CPC colored hydrogels. On the basis of such CPCs hydrogels with bright structural colors and robust self-healing properties, a 3D flower pattern has been designed to realize arbitrary 3D configurable modeling. This work might constitute a promising simple way to fabricate structural colored CPC materials with a longer functional life, and thus extend their practical applications.
研究领域:
材料科学
·
生物仿生学
✓ 已验证
产品关联
DOI
RSC Advances
·
2018
·Vol. 8
·期 8
·4072-4077
·
IF 2.936
Chuan Shi,Jianwei Zhu,Xiu Shen,Fuxing Chen,Fanggang Ning,Hongdi Zhang,Yun-Ze Long,Xin Ning,Jinbao Zhao
A flexible SiO2 porous fiber membrane (SF) is prepared by electrospinning followed by calcination in this work. Compared with an organic substrate separator, the SF used as a separator will be an absolute guarantee of the battery thermal safety. The porosity of the SF is 88.6%, which is more than twice that of a regular PP separator. Hydrophilic SF shows better electrolyte wetting ability and its high porosity enables the SF to absorb 633% liquid electrolyte on average, while the lithium-ion conductivity reaches 1.53 mS cm−1. The linear sweep voltammogram testing of PP and SF suggested that SF, with great electrochemical stability, can meet the requirements of lithium-ion batteries. The cyclic and rate performances of batteries prepared with SF are improved significantly. Such advantages of the SF, together with its potential in mass production, make the SF a promising membrane for practical applications in secondary lithium-ion batteries.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2017
·
IF 4.162
Li Liang,Xinghua Wang,Ying Sun,Pinyi Ma,Xinpei Li,Huilan Piao,Yanxiao Jiang,Daqian Song
The metal-organic framework (MOF) functionalized magnetic graphene oxide/mesoporous silica composites (Fe 3 O 4 @SiO 2 -GO/MIL-101(Cr)) were synthesized and utilized as magnetic solid-phase extraction (MSPE) adsorbent for the extraction of seven triazine herbicides (terbuthylazine, secbumeton , terbumeton , atraton , atrazine , prometon and trietazine) in rice samples. Several experimental parameters, including type and volume of extraction solvent, amount of MIL-101(Cr), extraction time, volume of desorption solvent and desorption time were investigated and optimized. The limits of detection (LODs) of seven triazine herbicides obtained by using the proposed MSPE method combined with high performance liquid chromatography (HPLC) were in the range of 0.010–0.080 µg kg −1 . The recoveries of the triazine herbicides in spiked rice samples ranged from of 83.9–103.5% with the relative standard deviations lower than 8.7%. The intra and inter-day (n = 6) precisions for all triazine herbicides at the spiked level of 100.0 µg kg −1 were 1.4–5.9% and 2.6–7.8%, respectively.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2013
·
IF 4.093
Huiqing Wu,Beibei Tang,Peiyi Wu
Polysulfone (PSf)-based hybrid membranes are developed by doping with SiO 2 –GO nanohybrid . The hybrid membranes exhibit improved water permeability with the rejection to egg albumin maintained at a high level (>98%). Especially, when the content of SiO 2 –GO in the membrane is 0.3 wt%, the water flux reaches a maximum that is nearly twice of that of PSf membrane. Compared with SiO 2 /PSf and GO/PSf hybrid membranes, SiO 2 –GO/PSf hybrid membrane presents the best overall properties, including water permeation rate , protein rejection, and antifouling ability. It can be attributed to the unique property of SiO 2 –GO nanohybrid , i.e., the high hydrophilicity and good dispersibility derived from silica nanoparticles which are densely and uniformly coated on the GO surface and perform as a space layer of GO .
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2017
·
IF 1.179
Xia Luo,Kejing Yu,Kun Qian
In this study, the graphene oxide/SiO2 hybrid materials with different sizes (GO/SiO2-80, GO/SiO2-170, GO/SiO2-250) were prepared via in situ preparation. Different sizes and weight fraction of GO/SiO2 were added into phenolic resin to prepare phenolic foam composites. The cell properties, morphologies, and mechanism of GO/SiO2 reinforced PF composites were studied. The results showed that the GO/SiO2-80 can improve the cell structure and compressive property obviously than other size nanoparticles. The PF modified with 1 wt% GO/SiO2-80 exhibited most uniform cell structure, and it showed a mean cell size of 117 µm and narrow cell size distribution from 50 µm to 225 µm. The obtained PF/(1 wt% GO/SiO2-80) also showed an excellent compressive strength and modulus of 0.18 and 3.22 MPa, which has increased by 80% and 61%, respectively, compared to the pure PF. This method may make it possible for using GO/SiO2 hybrid materials to enhance the cell structure and compression performance of the phenolic foam composites with broader applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）