RSC Advances
·
2016
·Vol. 6
·期 111
·110409-110415
·
IF 3.289
Jin Dong,Baoping Lin
As an effective luminescent down-shifting (LDS) species, Eu3+ complexes have been doped in ethylene-vinyl acetate (EVA) films to improve the spectral response of silicon photovoltaic modules in the ultraviolet region. One key point about the improvement of photoelectric conversion efficiency by the LDS technique is increasing the fluorescence intensity of the EVA composite film as far as possible while staying within the visible light transmittance of the film. Around this point, we attempt to offer an idea for further studies. In this study, nano-SiO2 modified by a silane coupling agent was doped into EVA film with a fixed content of Eu3+ complex by the casting method. The experimental results show that when the modified SiO2 content is within 4%, the fluorescence of the EVA composite film gradually increases with increase in the modified SiO2 content and before formation of EVA composite film, the fluorescence intensities have no difference between the mixture with modified SiO2 and that without modified SiO2. SEM and AFM images of the EVA composite films show that the complex particles are probably enwrapped by aggregations of the modified SiO2 during the film-forming process, which strengthens the rigidity of the Eu3+ complex in the structure and results in the enhancement of fluorescence intensity. When the modified SiO2 content is within 2%, the visible light transmittance of the EVA film only slightly decreases. The photoelectric conversion efficiency of polycrystalline silicon solar cell coated with the composite film increases from 12.13% to 12.29%. Hence, the study provides a feasible approach to improve the LDS technique and has a potential application value.
研究领域:
材料科学
·
光伏技术
·
纳米技术
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产品关联
DOI
高影响因子
AATCC Journal of Research
·
2024
·
IF 0.6
Que Kong,Zhiguang Li
In this paper, modified SiO2 nanoparticles were selected to improve the surface roughness and decrease the surface energy to improve the hydrophobic performance of cotton fabric. Tetraethoxysilane and octadecyltriethoxysilane were used as raw materials to synthesize octadecyltriethoxysilane-modified SiO2 nanoparticles (siloxane-SiO2), and combined with cotton fabric. The chemical composition and surface morphology of the fabric were measured. The contact angles of the modified cotton fabrics prepared under different reaction conditions were approaching or above 150°. In addition, dynamic evolutions of water droplets on the modified cotton fabric surface were discussed. The adhesive force and the energy conversion of droplet during the collision were investigated. The water droplet bounced due to the superhydrophobic properties of the cotton fabric surface producing enough residual energy. Finally, through the acid–base chemical resistance treatments, the rubbing and washing durability, and anti-fouling experiment, the modified fabric indicated excellent hydrophobic durability and self-cleaning performance.
研究领域:
材料科学
·
纺织工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Xiaoxiao Chen,Mengyao Liu,Lijuan Zhang,Yunshan Zhou,Enming Ping,Chunyan Ding
ZIF-67@NH 2 –SiO 2 composites were prepared by loading the metal-organic frameworks ZIF-67 on amino modified SiO 2 gel particles (NH 2 –SiO 2 , 80–100 mesh) through layer-by-layer self-assembly method. Systematic investigation on the effects of ZIF-67 loading amounts on NH 2 –SiO 2 packed stainless steel chromatographic column (specification 1.0 m×2.0 mm I.D.), the flow rate of He as carrier gas and the injection amount of mixed gas (H 2 /D 2 ) on the hydrogen isotope H 2 /D 2 separation performance at liquid nitrogen temperature, unraveled the optimal conditions for H 2 /D 2 isotope separation . The results showed that the optimal stationary phase materials under the optimized conditions can effectively separate H 2 and D 2 with separation resolution R = 1.52 and the separation time t = 10.15 min. The superior performance of the ZIF-67 is tentatively thought to be due to kinetic quantum sieving (pore size 3.3 Å) effect and chemical affinity sieving effect of Co ion in ZIF-67.
研究领域:
分析化学
·
材料科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Chengmin Hou,Qi Gui,Jiaqi Song,Ze Fan
The application potential of superhydrophobic coatings is inherently constrained by their stability, durability, and apparent color characteristics. To address these limitations, a thin superhydrophobic coating was prepared on the surface of cotton fabric, featuring a micron mastoid structure with distinct fiber boundaries. This coating is achieved through the grafting of polymer poly (trifluoroethyl methacrylate-random-glycyl methacrylate) and 3-(trimethoxysilyl) propyl methacrylate modified SiO 2 nanoparticles onto the fabric surface. The chemical composition, thermal stability and micro/nano structure of the coating were evaluated by infrared spectroscopy, X-ray diffraction, thermogravimetric analysis and scanning electron microscopy. The superhydrophobic coating not only exhibits exceptional oil-water separation capabilities, achieving a remarkable separation efficiency of 98%, but also ensures high reusability, enduring up to 10 consecutive oil-water separation cycles without significant performance degradation. Furthermore, the coating manifests mechanical stability and durability, maintaining its superhydrophobic nature even after undergoing rigorous mechanical abrasion, immersion in acidic and alkaline solutions, as well as exposure to elevated temperatures. In addition, an in-depth analysis was conducted to evaluate the influence of this superhydrophobic modification on the inherent characteristics of cotton fabric, specifically its color, whiteness, and gloss. The findings reveal that the hue of the cotton fabric remains unaltered, while a marginal enhancement in whiteness and a slight reduction in gloss are observed post-modification, indicating small impact on the inherent characteristics of cotton fabric.
研究领域:
材料科学
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纺织工程
·
表面化学
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2018
·Vol. 22
·期 11
·3475-3484
·
IF 2.509
Wang Hang,Li Xiaojie,feng Xi,Liu Ya,Kang Weimin,Xu Xianlin,Zhuang Xupin,Cheng Bowen
A novel approach is proposed to prepare a proton-conductive nanochannel membrane based on polyvinylidene difluoride (PVDF) porous membrane with modified SiO 2 nanospheres. The hydrophilic PVDF porous membrane with a 450-nm inner pore size was chosen as the supporting structure. Pristine SiO 2 with a uniform particle size of 95–110 nm was synthesized and functionalized with –NH 2 and –COOH, respectively. Through-plane channels of porous membrane and arranged functional nanoparticles in pores could contribute to constituting efficient proton transfer channels. The characteristics such as morphology, thermal stability, water uptake, dimensional swelling, proton conductivity and methanol permeability as proton exchange membranes, of the SiO 2 nanospheres, and the composite membrane were investigated. The formation of ionic channels in membrane enhanced the water uptakes and proton conduction abilities of the composite membranes. PVDF/Nafion/SiO 2 –NH 2 exhibited superior proton conductivities (0.21 S cm −1 ) over other samples due to several proton sites and the acid–base pairs formed between –NH 2 and –SO 3 H. Furthermore, all the composite membranes exhibited improved methanol resistance compared with Nafion. Therefore, such a design based on porous membrane provided feasibility for high-performance proton exchange membrane in fuel cell applications.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Jingfan Zhang,Yifang Hua,Jian Liu,Tao Zhu,Jun Sun,Xiaoyu Gu,Hongfei Li,Jingmao Zhao,Sheng Zhang
Organic-inorganic hybrid particles have been prepared by grafting styrene maleic anhydride copolymer (SMA) onto reactive amino-modified silica nanoparticles. The SMA modified SiO 2 (SMA-SiO 2 ) was incorporated into polycarbonate (PC)/acrylonitrile-butadiene-styrene (ABS) composites (4:1, wt%/wt%) with bisphenol A bis (diphenyl phosphate) (BDP) to simultaneously improve the mechanical properties and flame retardancy. The mechanical properties of the sample containing SMA-SiO 2 are apparently improved compared with that of samples containing unmodified SiO 2 . It is found that SMA-SiO 2 tends to distribute at the phase interface of PC/ABS, and therefore improves the compatibility between PC and ABS . Besides, the peak of heat release rate (PHRR) and the total smoke production (TSP) of the PC/ABS composites are decreased by the presence of SMA-SiO 2 . It is suggested that SMA-SiO 2 can form a flame retarding shell at the phase interface to protect ABS. In summary, both the mechanical properties and flame retardancy of PC/ABS composites are significantly improved due to the selective distribution of SMA-SiO 2 .
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Jianzhong Ma,Chenyang Liu,Yuehong Zhang,Yufei Dong,Chao Liu,Zhonglei Ma
A variety of nano SiO 2 microspheres with negative charge or positive charge were prepared by hydrochloric acid treatment or/and γ-mercaptopropyltrimethoxysilane modification respectively. The obtained modified SiO 2 with different content of -OH or -SH and different charges were physically introduced into water-borne polyurethane (WPU) dispersion to fabricate the WPU/modified SiO 2 nanocomposites with interfacial interaction of hydrogen bond and electrostatic interaction . The influence of interfacial interaction (hydrogen bond and electrostatic interaction) between WPU and modified SiO 2 on the interface structure and mechanical properties of the WPU/modified SiO 2 nanocomposites were investigated. The results showed that when both hydrogen bond and electrostatic interaction were present between WPU and modified SiO 2 , the microstructure and the tensile strength of the WPU/modified SiO 2 nanocomposite were mainly affected by the electrostatic interaction, while the elongation at break was mainly affected by the hydrogen bond interaction. Overall, a methodology of the combination of molecular dynamics simulation and experiment study was established to reveal the influence of surface characteristic of SiO 2 on the interface interaction and mechanical properties of the WPU/modified SiO 2 nanocomposites.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
Coatings
·
2023
·Vol. 13
·期 3
·563
·
IF 3.4
Chengqian Li,Peng Dou,Ruyi Zhao,Yurou Shi,Gaojie Fu,Bin Shen
Pollution flashover on insulators is one of the greatest challenges affecting the smooth operation of high-voltage transmission lines. Demonstrating super-hydrophobic coatings on insulators’ interfaces is an effective measure to prevent insulator flashovers. In the present investigation, a super-hydrophobic FAS-17-modified SiO2/PDMS coating on a composite insulator was demonstrated by spraying. The coating had a contact angle of 159.2° and a sliding angle of 1.3° with better insulation properties. The prepared FAS-17-modified nano-SiO2nanoparticles were not easy to agglomerate; to illustrate this, the binding energy was calculated by the density functional theory. The super-hydrophobic mechanism of the coating was explained in terms of the adsorption energy between SiO2molecules and water before and after modification. This paper provides a new method to solve the pollution flashover problem of insulators and a new angle to explain the super-hydrophobic mechanism.Keywords:super-hydrophobic;composite insulators;FAS-17-modified SiO2nanoparticles;de-agglomeration mechanism;super-hydrophobic mechanism;density functional theory
研究领域:
材料科学
·
电气工程
·
表面化学
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产品关联
DOI
高影响因子
Journal of the Mechanical Behavior of Biomedical Materials
·
2018
·
IF 3.239
Xue Liu,Zengyao Wang,Chengji Zhao,Wenhuan Bu,Hui Na
A series of fluorinated dental resin composites were prepared with two kinds of SiO 2 particles. Bis-GMA (bisphenol A-glycerolate dimethacrylate)/4-TF-PQEA (fluorinated acrylate monomer)/TEGDMA (triethylene glycol dimethacrylate) (40/30/30, wt/wt/wt) was introduced as resin matrix . SiO 2 nanopartices (30 nm) and SiO 2 microparticles (0.3 µm) were silanized with 3-methacryloxypropyl trimethoxysilane (γ-MPS) and used as fillers. After mixing the resin matrix with 0%, 10%, 20%, 30% SiO 2 nanopartices and 0%, 10%, 20%, 30%, 40%, 50% SiO 2 microparticles, respectively, the fluorinated resin composites were obtained. Properties including double bond conversion (DC), polymerization shrinkage (PS), water sorption (W p ), water solubility (W y ), mechanical properties and cytotoxicity were investigated in comparison with those of neat resin system. The results showed that, filler particles could improve the overall performance of resin composites, particularly in improving mechanical properties and reducing PS of composites along with the addition of filler loading. Compared to resin composites containing SiO 2 microparticles, SiO 2 nanoparticles resin composites had higher DC, higher mechanical properties, lower PS and lower W p under the same filler content . Especially, 50% SiO 2 microparticles reinforced resins exhibited the best flexural strength (104.04 ± 7.40 MPa), flexural modulus (5.62 ± 0.16 GPa), vickers microhardness (37.34 ± 1.13 HV), compressive strength (301.54 ± 5.66 MPa) and the lowest polymerization (3.42 ± 0.22%).
研究领域:
材料科学
·
牙科材料
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Jiahao Dong,Weihao Pan,Jing Luo,Ren Liu
In this work, a novel type of two-shell structured inhibitor-loaded polyaniline (PANI) microcapsule was fabricated for efficient corrosion protection of carbon steel. In our strategy, modified SiO 2 nanoparticles were used to stabilize an oil phase containing aniline, photo-crosslinkable monomer and crosslinker. Upon UV irradiation, the monomer and crosslinker underwent polymerization and converted into the first shell of microcapsules, which endows sufficient stability and robustness to the microcapsules. The subsequent polymerization of aniline at the oil/water interface contributed to the second layer of the microcapsules shell, which functioned as anticorrosion filler and pH-sensitive gatekeeper of the microcapsules to realize the responsive release of the incorporated inhibitor simultaneously. Corrosion inhibitor (2-mercaptobenzothiazole, MBT) was encapsulated into the prepared polyaniline microcapsules and pH-responsive release of MBT from the microcapsule was demonstrated. The anti-corrosion performance of the epoxy embedded with MBT loaded polyaniline microcapsules was achieved by the combination of the passivation of the steel surface by PANI and the on-demand release of MBT during the corrosion process, thus affording dual corrosion protection for the mild steel. The results showed that MBT loaded polyaniline microcapsules exhibited significantly enhanced corrosion protection of carbon steel than unloaded polyaniline microcapsules as well as MBT, demonstrating a synergistic inhibition effect of MBT and PANI.
研究领域:
材料科学
·
腐蚀工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Fei Lv,Kexin Liu,Zhuyi Wang,Jiefang Zhu,Yin Zhao,Shuai Yuan
The room and low-temperature performances of solid-state lithium batteries are crucial to expand their practical application. Polyethylene oxide (PEO) has received great attention as the most representative polymer electrolyte matrix. However, most PEO-based solid-state batteries need to operate at high temperature due to low room temperature ionic conductivity . Improving the ionic conductivity by adding plasticizers or reducing the crystallinity of PEO often compromises its mechanical strength . Here, an amorphous PEO-based composite solid-state electrolyte is obtained by ultraviolet (UV) polymerizing PEO and methacryloyloxypropyltrimethoxy silane (KH570)-modified SiO 2 which demonstrates both satisfactory mechanical performance and high ionic conductivity at room (3.37 × 10 −4 S cm −1 ) and low temperatures (1.73 × 10 −4 S cm −1 at 0 °C). In this electrolyte, the crystallinity of PEO is reduced through cross-linking, and therefore provides a fast Li + ions transfer area. Moreover, the KH570-modified SiO 2 inorganic particles promote the dissociation of lithium salts by Lewis acid centers to increase the ionic conductivity. Importantly, this kind of cross-linking networks endows the final electrolyte much higher mechanical strength than the pure PEO polymer electrolyte or PEO-inorganic filler blended systems. The solid-state LiFePO 4 /Li cell assembled with this electrolyte exhibits excellent cycling performance and high capacity at room and low temperatures.
研究领域:
材料科学
·
电化学
·
电池技术
·
聚合物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）