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

2006 ◽  
Vol 60 (29-30) ◽  
pp. 3718-3722 ◽  
Author(s):  
Fei Shi ◽  
Lijiu Wang ◽  
Jingxiao Liu
Keyword(s):  
Ambient Pressure ◽  
Silica Aerogels ◽  
Ambient Pressure Drying ◽  
Synthesis And Characterization ◽  
Drying Process

Synthesis and characterization of silica aerogels dried under ambient pressure bed on water glass

2015 ◽  
Vol 410 ◽  
pp. 58-64 ◽  
Author(s):  
Song He ◽  
Dongmei Huang ◽  
Haijiang Bi ◽  
Zhi Li ◽  
Hui Yang ◽  
...  
Keyword(s):  
Water Glass ◽  
Ambient Pressure ◽  
Silica Aerogels ◽  
Synthesis And Characterization

scholarly journals Synthesis and Characterization of Silica Aerogel from Rice Husk with Ambient Pressure Drying Method

2020 ◽  
Vol 1535 ◽  
pp. 012049
Author(s):  
Nor Fadilah Mohamad ◽  
Noor Hidayu Abdul Rani ◽  
Omar Syah Jehan Elham ◽  
Siti Hajar Anaziah Muhamad ◽  
Siti Afifah Muda ◽  
...  
Keyword(s):  
Rice Husk ◽  
Silica Aerogel ◽  
Ambient Pressure ◽  
Ambient Pressure Drying ◽  
Synthesis And Characterization ◽  
Drying Method

scholarly journals Eco-Friendly Synthesis of Water-Glass-Based Silica Aerogels via Catechol-Based Modifier

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2406
Author(s):  
Hyeonjung Kim ◽  
Kangyong Kim ◽  
Hyunhong Kim ◽  
Doo Jin Lee ◽  
Jongnam Park
Keyword(s):  
Water Glass ◽  
Ambient Pressure ◽  
Cost Effective ◽  
Silica Aerogels ◽  
Ambient Pressure Drying ◽  
Drying Process ◽  
Average Pore ◽  
Glass Silica ◽  
Effective Water ◽  
Alkoxide Precursors

Silica aerogels have attracted much attention owing to their excellent thermal insulation properties. However, the conventional synthesis of silica aerogels involves the use of expensive and toxic alkoxide precursors and surface modifiers such as trimethylchlorosilane. In this study, cost-effective water-glass silica aerogels were synthesized using an eco-friendly catechol derivative surface modifier instead of trimethylchlorosilane. Polydopamine was introduced to increase adhesion to the SiO2 surface. The addition of 4-tert-butyl catechol and hexylamine imparted hydrophobicity to the surface and suppressed the polymerization of the polydopamine. After an ambient pressure drying process, catechol-modified aerogel exhibited a specific surface area of 377 m2/g and an average pore diameter of approximately 21 nm. To investigate their thermal conductivities, glass wool sheets were impregnated with catechol-modified aerogel. The thermal conductivity was 40.4 mWm−1K−1, which is lower than that of xerogel at 48.7 mWm−1K−1. Thus, by precisely controlling the catechol coating in the mesoporous framework, an eco-friendly synthetic method for aerogel preparation is proposed.

Synthesis and Characterization of Rice Husk Ash Derived - Silica Aerogel Beads Prepared by Ambient Pressure Drying

2016 ◽  
Vol 694 ◽  
pp. 106-110 ◽  
Author(s):  
Zulhelmi Alif Abdul Halim ◽  
Muhamad Azizi Mat Yajid ◽  
Halimaton Hamdan
Keyword(s):  
Rice Husk ◽  
Silica Aerogel ◽  
Rice Husk Ash ◽  
Ambient Pressure ◽  
Nitrogen Adsorption ◽  
Ambient Pressure Drying ◽  
Synthesis And Characterization ◽  
Gel Beads ◽  
Desorption Method

Low density silica aerogel beads were synthesized from rice husk ash via sodium silicate route. The gel beads were prepared by the ball dropping method and dried at ambient pressure after surface modification (silylation) with trimethylchlorosilane (TMCS) solution. The characteristics of porous structure of silica aerogel beads were measured by Brunauer-Emmett-Teller (BET) nitrogen adsorption and desorption method. The silica aerogel beads showed a specific surface area as high as 773 m2/g. They also displayed water-repellant effect (hydrophobic) due to silylation as revealed by Fourier transform infrared spectroscopy (FTIR).

Preparation and characterization of silica aerogels from by-product silicon tetrachloride under ambient pressure drying

2018 ◽  
Vol 499 ◽  
pp. 387-393 ◽  
Author(s):  
Ting Zhou ◽  
Lunlun Gong ◽  
Xudong Cheng ◽  
Yuelei Pan ◽  
Congcong Li ◽  
...  
Keyword(s):  
Ambient Pressure ◽  
Silica Aerogels ◽  
Ambient Pressure Drying ◽  
Silicon Tetrachloride
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