JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2019
·Vol. 91
·期 3
·514-522
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IF 1.986
Gao Min,Liu Benxue,Zhao Ping,Yi Xibin,Shen Xiaodong,Xu Yue
Alumina (Al 2 O 3 )-based diphasic aerogels have better physical properties than those of pure Al 2 O 3 aerogel according to previous studies. In the present research, we focused on an alumina–titania (Al 2 O 3 -TiO 2 ) diphasic aerogel. A series of Al 2 O 3 aerogels were synthesized and studied with and without minor TiO 2 dopants (up to 10 mol%). We found that the pure Al 2 O 3 aerogel, which had the fiber-like particles, was stronger than those with TiO 2 dopants that possessed the sphere-like particles. However, the sphere-like particles make the TiO 2 -doped Al 2 O 3 aerogel (with 3 mol% TiO 2 ) possessing the largest specific surface area (SSA) of 650 m 2 /g, much larger than that of the pure Al 2 O 3 aerogel (326 m 2 /g). This work proved that fiber-like particles enhance strength but reduce SSA of Al 2 O 3 aerogel. At last, ceramic fibers reinforced Al 2 O 3 aerogel composites with the sizes of 20 cm width × 20 cm length × 1 cm thickness were fabricated. The aerogel composites possessed a thermal conductivity of 0.136 W/m K at 1000 °C, better than those of the ceramic fiber blankets itself (0.30 W/m K), indicating potential application as high-temperature thermal insulator.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Dewang Zeng,Chen Wang,Tong Liu,Wentao Ou,Rui Xiao
Chemical looping methane oxidative coupling is a promising method to directly convert methane to C 2 products but is limited by the trade-off between CH 4 conversion and C 2 selectivity. Here, we develop a series of TiO 2 doped Na 2 WO 4 /Mn 2 O 3 /SiO 2 for chemical looping methane oxidative coupling and investigate the underline mechanism for the enhanced performance. The results show that 5 wt% TiO 2 doped Na 2 WO 4 /Mn 2 O 3 /SiO 2 exhibited 31.2% CH 4 conversion, which is 1.68 times as large as that of Na 2 WO 4 /Mn 2 O 3 /SiO 2 , without significantly decreasing C 2 selectivity (~70.3%). Pulse experiments show that TiO 2 improves the bulk oxygen diffusion, providing more surface oxygen to convert methane, thus leading to enhanced CH 4 conversion. O 1 s spectra manifests that the active oxygen content on the surface was not significantly increased by TiO 2 dopant , thus TiO 2 dopant has little effect on C 2 selectivity. Therefore, 5 wt% TiO 2 doped Na 2 WO 4 /Mn 2 O 3 /SiO 2 shows high chemical looping methane oxidative coupling performance. The explored mechanism in this work can be extended to design more oxygen carriers to enhance the chemical looping reactions.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shuangchun Jiang,He Tao,Yingjuan Shao,Yao Fu,Wenqi Zhong
The pressurization can significantly enhance the thermochemical energy storage performance of Ca-based materials. In this study, detailed experimental investigations were conducted in both fixed bed and fluidized bed on the performance of TiO 2 modified Ca-based materials ranged from 700 °C to 900 °C under pressurized conditions (0.1 MPa to 0.8 MPa) from powder to pellet, including the influence of inert dopants on the properties of CaO powder, the optimization of biomass pore-former agents' selection and the enhancement of pressurized fluidization states on the performance of pelletized materials. The findings indicated that the pressure intensity has a positive correlation with the energy storage density and cyclic stability of TiO 2 modified Ca-based materials. The results demonstrated that the properties of CaO powder intensified with the pressure and the energy storage density was increased by 31.4 % with 5 % TiO 2 doped at 0.8 MPa. And the energy storage performance of the pelletized CaO-5TiO 2 with 10 % bagasse added was also significantly improved at a higher-pressure condition. The energy storage performance of the determined 10B-CaO-5TiO 2 pellet under fluidization conditions at 0.8 MPa was 38.9 % higher than that of atmospheric pressure after 10 cycles. As the carbonation pressure increased, the average grain size of CaO exhibited a decline of 7.0 %, a slighter sintering and deeper reaction region were observed into the determined pellet. Furthermore, the specific surface area and pore volumes of the 10B-CaO-5TiO 2 pellets under high carbonation pressure were 382.8 % and 460.0 % higher than that of atmospheric pressure in the fluidized bed, respectively.
研究领域:
材料科学
·
能源化学
·
化学工程
·
多相催化
·
储能技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Yuechang Lian,Xiaojing Wang,Shuaiyu Chen,Siyuan Xiang,Yuchao Wang,Shengyang Tao,Wendong Liu
Superhydrophobic fabrics exhibit exceptional potential for oil–water separation, providing effective solutions to environmental challenges such as industrial wastewater and marine oil spills. To streamline the fabrication process and mitigate oily contamination, we developed an in situ growth approach to coat polyester fabric with superhydrophobic TiO2-doped silicone nanofilaments. The coated fabric facilitates highly efficient oil–water separation and exhibits light-driven self-cleaning properties. By precisely controlling the synergistic hydrolysis conditions of methyl trichlorosilane (MTCS) and tetrabutyl titanate (TBT), TiO2-doped silicone nanofilaments were successfully grown on the fabric surface, resulting in a highly porous coating. Integrating this porous structure with the residual methyl groups from MTCS made the fabric superhydrophobic, allowing it to separate various oil–water mixtures efficiently with excellent reusability and high-pressure resistance (2950 Pa). Incorporating TiO2 further endowed the superhydrophobic fabric with light-driven self-cleaning capabilities, enabling the degradation of organic contaminants without compromising its liquid repellency. This simple, cost-effective, and productive fabrication method is highly adaptable, making it valuable for researchers aiming to introduce superhydrophobicity to diverse substrates and surfaces. With its high oil–water separation efficiency and light-driven self-cleaning properties, the superhydrophobic TiO2-doped silicone nanofilament-coated fabric holds significant potential for applications in oil pollution remediation, self-cleaning surfaces, and desalination.
✓ 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）