Results 261 to 270 of about 145,193 (295)

Preparation and Characterization of Hydrophobic Silica Aerogel by Ambient Pressure Drying Method

Key Engineering Materials, 2013
Silica aerogel has been prepared by ambient pressure drying technique using water glass as starting materials. Solvent exchange and surface modification were simultaneously conducted by immersing the wet hydrogel in EtOH/TMCS(Tri Methyl Chloro Silane)/hexane solution.
Hui Xu, Gui Ln Fu, Yu Qiang Guo, Jing Chun Tu, Yong Chen   +4 more
openaire   +1 more source

A Practical Approach for Producing Hydrophobic and Elastic Aerogels by Ambient Pressure Drying

Advanced Materials Research, 2011
Hydrophobic and elastic aerogels derived from methyltrimethoxysilane (MTMS) precursor were prepared by ambient pressure drying under various processing conditions, and their morphology and physical and mechanical properties were characterised and evaluated. The results of this study demonstrated that for inherently hydrophobic gels like MTMS based gels,
Jackie Y. Cai, Bi Xu, Li Jing Wang, Yi Cao, Niall Finn, Zai Sheng Cai   +5 more
openaire   +1 more source

Influence of Hydrolysis Time on Properties of SiO2 Aerogels Prepared by Ambient Pressure Drying

Arabian Journal for Science and Engineering, 2020
With ethyl orthosilicate as precursor and trimethylchlorosilane as surface modifier, hydrophobic SiO2 aerogels are prepared through sol–gel process combined with ambient pressure drying process. The influence law of different hydrolysis times on microstructure and physicochemical properties of aerogels when the reaction precursor is in the sol phase is
Wei Luo, Xin Shu, Binbin Xu, ZhaoHui Liu, Zhongwen Ou, JingMing Liu   +5 more
openaire   +1 more source

Effects of Surfactants on the Synthesis of Silica Aerogels Prepared by Ambient Pressure Drying

Key Engineering Materials, 2012
In this research, aerogels were synthesized by a two-step sol-gel process without supercritical conditions. During the process, tetraethoxysilane (TEOS) was used as precursor, and different surfactants, i.e. cetyltrimethyl ammonium bromide (CTAB) and polyethylene glycol–600 (PEG–600), were used as dopants respectively.
Hua Zheng Sai, Li Xing, Jun Hui Xiang, Fu Shi Zhang, Li Jie Cui, Xiao Hong Liang, Bo Song, Chun Lin Zhao, Zhen You Li   +8 more
openaire   +1 more source

Characterization of commercial aerogel-enhanced blankets obtained with supercritical drying and of a new ambient pressure drying blanket

Energy and Buildings, 2019
Abstract Aerogel-enhanced products are often seen as promising materials for providing significant thermal resistance with reduced thickness. In particular, aerogel-enhanced blankets have already shown their effectiveness in several building retrofitting projects.
Berardi UMBERTO, Zaidi S.
openaire   +2 more sources

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
openaire   +2 more sources

The Selection of Azeotropes at Ambient Pressure Drying of Aerogels

2015
The representation of phase states in the multicomponent systems by graphical images is used for estimation of the LV (xL = xV) azeotrope influence on SLV and L = V equilibria. These theoretical investigations occurred from complications arising at an ambient pressure drying (APD) synthesis of transparent and crackfree bulk silica aerogels.
Nipan, G.D., Mykaylo, O.A., Young-Jei Oh
openaire   +1 more source

Synthesis and characterization of silica aerogels by a novel fast ambient pressure drying process

Materials Letters, 2006
Abstract Using cheap waterglass as silica source, silica aerogels were synthesized via a novel fast ambient drying by using an ethanol/trimethylchlorosilane (TMCS)/Heptane solution for modification of the wet gel. One-step solvent exchange and surface modification were simultaneously progressed by immersing the hydrogel in EtOH/TMCS/Heptane solution,
Fei Shi, Lijiu Wang, Jingxiao Liu
openaire   +1 more source

Preparation of Monolithic Silica Aerogel of Low Thermal Conductivity by Ambient Pressure Drying

Journal of the American Ceramic Society, 2007
Monolithic silica aerogels with thermal conductivity as low as 0.036 W·(m·K) −1 and porosity as high as 97% were successfully prepared by ambient pressure drying through a multiple modification approach.
Te‐Yu Wei, Tso‐Fu Chang, Shih‐Yuan Lu, Yu‐Cheng Chang   +3 more
openaire   +1 more source

Respiratory effects of warm and dry air at increased ambient pressure.

Undersea biomedical research, 1992
We have measured in 7 divers forced vital capacity (FVC), forced expired volume in 1 s (FEV1), and forced midexpiratory flow rate (FEF25-75%) before and after exposure to dry or humid breathing gas of 35.3 degrees-36.8 degrees C (air) when diving to pressures of 117-600 kPa.
E, Thorsen, I, Rønnestad, K, Segadal, A, Hope   +3 more
openaire   +1 more source