LANGMUIR
·
2019
·
IF 3.683
Xinbing Jiang,Ben Q. Li,Xiaoli Qu,Huan Yang,Jinyou Shao,Hongmei Zhang
This paper discusses synthesis and application of dual functional SiO2@Au@SiO2@QD composite nanoparticles for integrated intracellular heating with temperature motoring. The particles are of multilayered concentric structure, consisting of Au nanoshells covered with quantum dots, with the former for infrared heating through localized surface plasma resonance while the later for temperature monitoring. The key to integrate plasmonic-heating/thermal-monitoring on a single composite nanoparticle is to ensure that the quantum dots be separated at a certain distance away from the Au shell surface in order to ensure a detectable quantum yield. Direct attachment of the quantum dots onto the Au shell would render the quantum dots practically functionless for temperature monitoring. To integrate quantum dots into Au nanoshells, a quantum quenching barrier of SiO2 was created by modifying a Stöber-like process. Materials, optical and thermal characterization was made of these composite nanoparticles. Cellular uptake of the nanoparticles was discussed. Experiments were performed on simultaneous in vitro heating and temperature monitoring in a cell internalized with the dual-functional SiO2@Au@SiO2@QD composite nanoparticles.
研究领域:
纳米技术
·
材料科学
·
生物医学工程
·
细胞生物学
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DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Su Li,Xiaozhe Liu,Yongwu Lu,Tiejun Lin,Kun Gong,Caiqi Wang,Yunlei An,Fei Yu,Liangshu Zhong,Yuhan Sun
Selective conversion of syngas to olefins has aroused extensive attention while some challenges still existed such as high CO 2 selectivity. Herein, a series of hydrophobic FeMnO x @SiO 2 -y-(CH 3 ) 3 (y represents SiO 2 weight percent of the catalyst) catalysts with various SiO 2 shell content were synthesized for Fischer-Tropsch to olefins (FTO). During the activation process, high hydrophobic SiO 2 -coating content catalysts suppressed the reduction/carburization of iron species to iron carbide. During FTO reaction, iron carbide of low hydrophobic SiO 2 -coating content catalysts was re-oxidized while it was stabilized for high hydrophobic SiO 2 -coating content catalysts. The trade-off among CO 2 , CH 4 selectivity and SiO 2 -coating content was reflected as an increasing trend relationship, while olefins selectivity exhibited a decreasing trend. Additionally, a desirable hydrophobic SiO 2 -coating (8.2 wt%) catalyst apparently suppressed CO 2 formation (4.7 C%) with high olefins selectivity (54.6 C%) at CO conversion of 50.7%. This study provides an efficient approach to inhibit CO 2 formation of Fe-based FTO catalyst.
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产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 56
·32368-32376
·
IF 2.936
Yichang Yu,Chengjun Li,Shoushuang Huang,Zhangjun Hu,Zhiwen Chen,Hongwen Gao
The xSiO2–BiOBr (x = 0–5) and SN–SiO2–BiOBr hybrids were synthesized via a facile one step co-precipitation method. To determine the optimal formula, the photocatalytic degradation of C. I. reactive red 2 (X3B) with xSiO2–BiOBr (x = 0–5) was investigated. Under simulated sunlight irradiation, 4SiO2–BiOBr exhibited a better photocatalytic efficiency than other materials; 1.77 and 1.51 times higher than conventional nano TiO2 and pure BiOBr, respectively. To demonstrate the photocatalytic degradation mechanism, the effect of active species on degradation of X3B was carried out, and a possible degradation pathway was proposed. To realize the combined treatments of adsorption and photocatalysis, an inorganic/organic (I/O) SN–SiO2–BiOBr hybrid was further strategized and synthesized. It showed much better adsorption performance than the SiO2–BiOBr composite. It could enrich organic pollutants by facile adsorption, and then degrade them to H2O and CO2 under natural sunlight irradiation. Notably, this sunlight-driven photocatalysis can be performed in the slurry resulted from the pollutant adsorption. As a result, the proposed combination of adsorption and photocatalysis will provide a novel strategy to greatly facilitate the treatment of organic wastewater.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
Science China-Materials
·
2022
·Vol. 66
·期 3
·1062-1070
·
IF 8.64
Wang Yang,Chen Sai,Sun Jiachen,Xie Yufei,Zhao Zhi-Jian,Pei Chunlei,Gong Jinlong
Supported vanadium oxides (VO x ) are alternative candidates for non-oxidative propane dehydrogenation (PDH) owing to their competitive performance. This paper describes the roles of V−O sites on PDH over monomeric VO x species supported on ZrO 2 , Al 2 O 3 and SiO 2 . With the control of pre-reduction, stable structures of V−O sites are obtained for PDH, including V−O-support (V−O−S), V−OH and V=O sites. By tuning the V densities over individual support, the propylene formation rate shows a linear correlation with the number of the V−O−S site, which indicates the V−O−S site plays a decisive role in PDH rather than V−OH and V=O sites. Moreover, the specific activity per V−O−S site over ZrO 2 (8.2 × 10 −3 s −1 ) is higher than those over Al 2 O 3 (6.7 × 10 −3 s −1 ) and SiO 2 (2.8 × 10 −3 s −1 ), due to the discrepant Lewis acidity of various V−O−S sites. This research provides a fundamental insight into the intrinsic nature of V−O sites for non-oxidative propane dehydrogenation.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
CATALYSIS SURVEYS FROM ASIA
·
2018
·Vol. 22
·期 4
·222-229
·
IF 3.081
Gao Meixiang,Jiang Haoxi,Zhang Minhua
Series of ZrO 2 supported on the different kinds of SiO 2 carriers were applied in the reaction of 1, 3-butadiene formation from ethanol and acetaldehyde. ZrO 2 /Nano-SiO 2 performed the best performance with the 1, 3-butadiene selectivity 91.43% and the total conversation 52.39%. Prepared catalysts were characterized by N 2 adsorption–desorption, TEM, XRD, temperature-programmed desorption of NH 3 and CO 2 , FTIR spectroscopy of adsorbed pyridine and CO 2 , Raman XPS. The results show that the weak Lewis acid and basic sites are appropriate for BD formation. Furthermore, more and balance acid-basic sites are rather important for the reaction of ethanol and acetaldehyde conversion to BD.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Lu Wang,Xinxin Zhu,Keke Tu,Dan Liu,Haolin Tang,Junsheng Li,Xi Li,Zhi-zhong Xie,Deyu Qu
To alleviate the volume variation upon the silicon oxide during the lithium ion storage process and improve its cyclic stability as well as rate performance in the application of anode material in LIBs, a silicon oxide, carbon and carbon nanotube hybrid material with coaxial structure is developed here in a two-step manner. The formed Carbon-SiO 2 @SiO 2 @CNT coaxial nanotube material carries 644 mAh g −1 stable capacity under 0.1 A g −1 as the anode material in LIBs. After over 5000 operating cycles under 1 A g −1 , 242 mAh g −1 reversible capacity is clearly demonstrated. The enhanced electrochemical performances can be mostly attributed to the inner carbon nanotube and outer carbon layer, both of which can relief the stress arising from the change of volume and improve the conductivity. The coaxial structure may also benefit to the lithium ions transportation.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 25
·1-13
·
IF 2.8
Xue Longlong,Xiong Shisheng
In the anti-wind–sand environment, it is challenging to find a single material that fulfills all the required functional application requirements, such as shielding performance, mechanical performance, chemical performance, reliability, and economic efficiency. Herein, a multi-layer electromagnetic shielding composite sheet specifically was designed for large military bases in anti-wind–sand environments. The composite material structure comprises laminated aluminum foil, PET film, and Oxford fabric, utilizing an acrylic emulsion pressure-sensitive adhesive that was modified with superior nano-SiO 2 . The results showed that the electromagnetic interference shielding of Al Mylar foil (0.03 mm) measured 88 dB, whereas the medium gauge foil recorded 84.7 dB after salt spray test for 288 h. The samples of Oxford fabric showed an increase in tensile and tearing strength as the fabric density increases, but the rate of increase decreases gradually. The shear and peel strengths of acrylic emulsion modified by hydrophobic nano-SiO 2 were 67.1 MPa and 24.3 N/m, respectively, with a blending ratio of 7 wt%. Finally, we handpicked 140 g/m 2 of Oxford cloth, 0.03 mm of aluminum foil with PET films, and acrylic emulsion pressure-sensitive adhesive containing 7 wt% hydrophobic nano-SiO 2 for the lamination. The samples have good aging performance, with electromagnetic shielding performance, shear strength, peel strength, and weight loss declining less than 10% at 85 °C and 85% RH for 1000 h.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Photonics
·
2023
·Vol. 10
·期 10
·1113
·
IF 2.4
Junhu Cai,Xiaogang Chen,Wenyan Zhang,Longwen Yang,Zexi Lin,Wenxiao Zhao,Yun Ye,Sheng Xu,Tailiang Guo,Enguo Chen
Owing to their composition-tunable and narrow emissions and high photoluminescence quantum yield (PLQY), inorganic halide perovskite quantum dots (IPQDs) are a promising option for wide color gamut displays. However, their practical applications have been limited by their lattice structure instability and surface defect states. Herein, CsPbBr3:KBF4@SiO2with improved stability and optical properties is successfully synthesized with a two-step optimization of fluorine (F) anion doping and SiO2in situ coating. Compared with bromide (Br), higher electronegativity and a smaller radius of F lead to stronger binding energy with Pb2+. Also, F anions can occupy surface Br vacancies. Then, benefiting from the acidic environment provided by BF4−hydrolysis, tetraethyl orthosilicate (TEOS) can be more easily hydrolyzed on the CsPbBr3:KBF4surface to generate SiO2coating, thus further passivating lattice defects and improving environmental stability. Importantly, the PLQY of CsPbBr3:KBF4@SiO2achieves 85%, and the stability has been greatly improved compared with pure CsPbBr3. Finally, CsPbBr3:KBF4@SiO2/PDMS, CsPbI3/PDMS, and CsPbCl3/PDMS composites with narrow emissions are applied to replace traditional phosphors as color converters for direct-view light-emitting diode (LED) displays or liquid crystal display (LCD) backlights. The color gamut reaches 118.22% under the NTSC standard. Concerning the display field, it suggests likely applications in the future.Keywords:CsPbBr3;KBF4;SiO2;wide color gamut;liquid crystal displays;LED displays
研究领域:
材料科学
·
光学工程
·
显示技术
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Hao Xiong,Anze Shui,Qingliang Shan,Shenghui Zeng,Xiuan Xi,Bin Du
To recycle application of polishing porcelain stoneware tile residues (PPR), foamed ceramics were usually considered as an effective way. In this study, a kind of foamed ceramic was synthesized, simulating the main phase of PPR. The effects of SiO 2 addition on crystalline phase, microstructure, physical properties, thermal conductivity , mechanical performance were systematically investigated, the related mechanism was discussed in detail as well. With the increase of SiO 2 , a large amount of spinel was formed in the foamed ceramics. The results demonstrated that the foamed ceramic with 10 wt% SiO 2 powder, sintered at 1200 °C for 30 min, possesses compressive strength of ~30.6 MPa, thermal conductivity of ~0.43 W*m −1 k −1 , average pore size of ~15 μm and porosity of ~44.1%. A unique structure with gaps in the pore wall of sample containing 10 wt % SiO 2 was found, which gives the foamed ceramics high compressive strength and low thermal conductivity.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 70
·56478-56485
·
IF 3.84
Guozhi Fan,Shanshan Luo,Qiang Wu,Tao Fang,Jianfen Li,Guangsen Song
A magnetic Fe3O4@SiO2–ZnBr2 catalyst was prepared by supporting ZnBr2 on silica-coated magnetic nanoparticles of Fe3O4 and used as a recoverable catalyst for the direct synthesis of diphenyl carbonate (DPC) from CO2 and phenol in the presence of carbon tetrachloride. The as-prepared catalyst was characterized by infrared spectroscopy (IR), powder X-ray diffraction (XRD), a X-ray photoelectron spectrometer (XPS) and BET. Zn loading in the supported catalyst and leaching during the reaction process were determined by atomic absorption spectroscopy (AAS). It was found that Fe3O4@SiO2–ZnBr2 showed higher catalytic activity than homogenous ZnCl2 and ZnI2 as well as homogenous ZnBr2. With this new catalyst under optimized conditions, a yield of DPC at 28.1% was obtained. The heterogeneous catalyst Fe3O4@SiO2–ZnBr2 can also be recovered by a permanent magnet after the reaction and reused up to 4 times without noticeable deactivation.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2026
·
IF 5.8
Wenyue Jiang,Xue Yang,Tong Weng,Rahman M.D. Mahbubur
In order to address the issues of weak interface bonding, poor structural stability, and difficulty in simultaneously optimizing functional performance of traditional silica (SiO2) aerogel materials, and to further expand the application of SiO2 aerogels in the field of building energy conservation, 3-aminopropyltriethoxysilane (APTES) and tetraethoxysilane (TEOS) were used as cosilicon sources in this study. On this basis, polyurethane foam (PUF)/SiO2 aerogel composite phase-change materials (PFSA-X) with different APTES/TEOS molar ratios were prepared by vacuum impregnation and freeze-drying technology. The effects of the APTES ratio on the nanostructure and properties of the composites were systematically investigated. Studies have shown that when n (APTES):n (TEOS) = 0.3, APTES can give full play to the role of a “molecular bridge” and a “network regulator” to construct an organic–inorganic hybrid system with dense nanostructures and strong interface bonding. Thanks to this nanostructure feature, PFSA-0.3 exhibits a high phase-change enthalpy (350.7 J/g), a low thermal conductivity (0.028 W/(m·K)), high compressive strength, excellent thermal stability, and significantly improved flame retardant and smoke suppression properties. This study not only provides ideas and experimental basis for the nanostructure design of high-performance composite phase-change materials but also lays a foundation for its application in the fields of building energy conservation and high-temperature thermal protection.
✓ 已验证
DOI
高影响因子
Chemical Engineering and Processing-Process Intensification
·
2018
·
IF 2.826
Yanyan Guo,Chengna Dai,Zhigang Lei
A series of Pd-La/SiO 2 /cordierite (cordierite = COR) and Pd-Zn/SiO 2 /COR bimetallic monolithic catalysts were prepared, characterized, and tested for the hydrogenation of 2-ethylanthraquinone (eAQ) as the key step of anthraquinone method for production of H 2 O 2 . It was found that the metal particle size is remarkably dependent on the Pd/M (M = La, and Zn) mass ratio of bimetallic monolithic catalysts. By virtue of its small metal particle size and the strong interaction, the 0.8% Pd-0.4% La/SiO 2 /COR monolithic catalyst presents the highest H 2 O 2 yield (7.7 g L −1 ) and selectivity toward active quinones (95%), which is attributed to the addition of La leading to the synergistic effect between Pd and La. Moreover, the density functional theory (DFT) calculations for the adsorption of eAQ over the surface of Pd-La/SiO 2 /COR and Pd-Zn/SiO 2 /COR bimetallic monolithic catalysts have been conducted to further understand the mechanism of molecule–surface interactions between eAQ and the PdM(1 1 1) or Pd(1 1 1) surfaces. Detailed studies showed that the high catalytic activity of Pd-La/SiO 2 /COR bimetallic monolithic catalyst is attributed to the stronger adsorption between Pd 3 La 1 (1 1 1) and the carbonyl group of eAQ.
研究领域:
催化化学
·
材料科学
·
理论化学
✓ 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）