Results 251 to 260 of about 29,105 (295)

Synthesis and Properties of Metal Oxide Aerogels via Ambient Pressure Drying

Journal of Nanoscience and Nanotechnology, 2019
Metal oxide aerogels such as zirconia (ZrO₂), titania (TiO₂), and alumina (Al₂O₃) aerogels are very interesting nanoporous materials applicable as thermal insulators, catalysts, sensors, and so on. To obtain the aerogels, the first key step is a sol-gel process to prepare the gel followed by either supercritical drying, ambient pressure drying, or ...
Uzma K H, Bangi, Kyu-Yeon, Lee, Noor Mahmad N, Maldar, Hyung-Ho, Park   +3 more
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Processing of alumina low-density xerogels by ambient pressure drying

Journal of Non-Crystalline Solids, 2001
Abstract Alumina is utilized as a catalyst and catalyst support, applications that can benefit from a high surface area and significant mesopore volume. Such characteristics can be achieved through ambient pressure drying (APD) using a methodology similar to that which has proven successful with silica.
J.Wayne Frazee, Thomas M Harris
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Elastic silica aerogel using methyltrimethoxysilane precusor via ambient pressure drying

Journal of Porous Materials, 2015
The use of N,N-dimethylformamide (DMF) as a drying control chemical additive was found to be effective in obtaining methyltrimethoxysilane (MTMS) based silica aerogels in terms of excellent monolithic property, hydrophobicity and elasticity. The aerogels were produced by hydrolysis and condensation of methanol diluted MTMS in presence of ammonia ...
Long Cai, Guorong Shan
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Hydrophobic Flexible Silica Aerogels Felts Fabricated by Ambient Pressure Drying

Advanced Materials Research, 2013
Hydrophobic flexible silica aerogels felts were fabricated successfully by two-steps sol-gel process via ambient pressure drying. First of all, the sol with various pH values was obtained from tetraethylorthosilicate (TEOS) as silicon source, hydrochloric acid/aqueous ammonia ethanol solution as catalysts.
Xiao Yun Wu, Yu Xi Yu, De Qian Guo, Yong Chen   +3 more
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Lightweight, strong and thermally insulating polymethylsilsesquioxane- polybenzoxazine aerogels by ambient pressure drying

Journal of Sol-Gel Science and Technology, 2021
Lightweight and high-strength aerogels are specially required in thermal insulation and thermal protection. However, maintaining light weight and high-strength still represents a formidable challenge. Herein we explore a strategy to introduce polyvinylmethyldimethoxysilane (PVMDMS) into polybenzoxazine (PBO) for enhancing the skeleton, and PVMDMS-PBO ...
Liangjun Li, Yunyun Xiao, Sizhao Zhang, Junzong Feng, Yonggang Jiang, Jian Feng   +5 more
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Processing of low-density silica gel by critical point drying or ambient pressure drying

Journal of Non-Crystalline Solids, 2001
Abstract Various methods for the production of low-density silica from silica gel were studied. The silica gel was prepared by the `two-step' sol–gel method. The `DSB process' (developed by Deshpande, Smith and Brinker), which takes the gel through solvent exchange, reaction with trimethylchlorosilane (TMCS) and ambient pressure drying (APD), was ...
Valerie D Land, Thomas M Harris, Dale C Teeters   +2 more
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Superhydrophobic sodium silicate based silica aerogel prepared by ambient pressure drying

Materials Chemistry and Physics, 2013
Abstract The superhydrophobic silica aerogel was prepared by using less expensive sodium silicate as a main silica source through a cost-effective and simple route via ambient pressure drying. The sodium impurity was first eliminated by mixing sodium silicate with a co-precursor methyltriethoxysilane (MTES) followed by ion exchange process.
Shao, Zaidong, Luo, Fengzuan, Cheng, Xuan, Zhang, Ying   +3 more
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Silica aerogel-supported copper catalyst prepared via ambient pressure drying process

Journal of Sol-Gel Science and Technology, 2015
Copper–silica aerogel catalyst was synthesized through the impregnation of silica alcogels by copper precursor and ambient pressure drying of the impregnated alcogels. In this safer and lower energy consumption drying mode for maintaining the gel structure, the solvent exchange and chemical surface modification were done before the drying step.
Taher Yousefi Amiri, Jafarsadegh Moghaddas, Saeid Rahmani Khajeh   +2 more
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Synthesis of Silica Aerogel from Bagasse Ash by Ambient Pressure Drying

AIP Conference Proceedings, 2011
Silica aerogels having very high surface area and pore volume have been succesfully synthesized from bagasse ash by ambient pressure drying (APD) method. Silica in bagasse ash was extracted by alkali extraction to produce sodium silicate solution. This is done by boiling bagasse ash in 2 N NaOH solution under continuous stirring for 1 h.
Nazriati Heru Setyawan, Sugeng Winardi, Ferry Iskandar, Mikrajuddin Abdullah   +3 more
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Surface modification of silica aerogels with trimethylchlorosilane in the ambient pressure drying

Inorganic Materials, 2008
Silica aerogels were made by sol-gel techniques using tetraethoxysilane, followed by drying under ambient pressure. BET and XRD results show that the silica aerogels have a high inner surface area and are amorphous. Laser granularity analysis shows that the average particle size of silica aerogels is less than 20 μ m and that they have mesoporous ...
XiaoChun Zhou, LuPing Zhong, YaPing Xu
openaire   +1 more source