scholarly journals Study of the influence of various solvents on the properties of hydrophobic silica xerogels

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 129-130
Author(s):  
A. A. Kolmakova ◽  
◽  
A. E. Baranchikov ◽  
Keyword(s):  
Atmospheric Pressure ◽  
Three Dimensional ◽  
Silica Aerogels ◽  
Nanoporous Materials ◽  
Optimal Combination ◽  
Nanoporous Structure ◽  
Low Density ◽  
Silica Xerogels ◽  
Hydrophobic Silica ◽  
Alcohol Solvents

Silica aerogels are low-density inorganic aerogels with a three-dimensional nanoporous structure. Due to the inherent properties of nanoporous materials, the possibility of using silica airgel is of great interest in various fields. To simplify the process and reduce costs, the use of atmospheric pressure drying (APD) is promising, the resulting materials are called xerogels. Silica xerogels based on methyltrimethoxysilane were synthesized using various alcohol solvents. The optimal combination of properties is possessed by a sample obtained using methanol as a solvent. The wetting angle of all xerogels was 158°, which characterizes the resulting material as superhydrophobic.

Three-dimensional optofluidic waveguides in hydrophobic silica aerogels via supercritical fluid processing

2013 ◽  
Vol 73 ◽  
pp. 28-33 ◽  
Author(s):  
Gamze Eris ◽  
Deniz Sanli ◽  
Zeynep Ulker ◽  
Selmi Erim Bozbag ◽  
Alexandr Jonás ◽  
...  
Keyword(s):  
Supercritical Fluid ◽  
Three Dimensional ◽  
Silica Aerogels ◽  
Hydrophobic Silica ◽  
Optofluidic Waveguides ◽  
Supercritical Fluid Processing

A Novel Route for Preparation of Transparent and Superhydrophobic Silica Aerogels

2009 ◽  
Vol 1234 ◽  
Author(s):  
Guo-you Wu ◽  
Xuan Cheng ◽  
Yu-xi Yu ◽  
Ying Zhang
Keyword(s):  
Surface Modification ◽  
Ambient Pressure ◽  
Sol Gel ◽  
Three Dimensional ◽  
Silica Aerogels ◽  
Ambient Pressure Drying ◽  
Nanoporous Structure ◽  
Surface Areas ◽  
Superhydrophobic Silica ◽  
Dta Curve

AbstractSilica aerogels were synthesized via sol-gel processing followed by a two-step surface modification and ambient pressure drying, using methyltrimethoxysilane (MTMS) and trimethylchlorosilane (TMCS)/ethanol/n-hexane as surface modification agents. The transparent silica aerogels possessed the porosities, densities and specific surface areas in the range of 87.7–92.3%, 0.27–0.17 g·cm-3 and 852–1005 m2·g-1, respectively. The SEM and HRTEM analysis revealed the three-dimensional nanoporous structure of the silica aerogels. The presence of –CH3 functional groups on the surface of silica particles as indicated by the FTIR spectra was further confirmed by two visible exothermic peaks at 310 and 450–500 °C from the DTA curve. In addition, the silica aerogels were superhydrophobic with the contact angle as high as 160°.

Inorganic Aerogel Granules Dried at Atmospheric-Pressure

2007 ◽  
Vol 124-126 ◽  
pp. 675-678 ◽  
Author(s):  
Jeong Gu Yeo ◽  
Jeong Min Hong ◽  
Churl Hee Cho ◽  
Sharad D. Bhagat ◽  
Yong Ha Kim ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Surface Modification ◽  
Atmospheric Pressure ◽  
Spherical Shape ◽  
Average Diameter ◽  
Silica Aerogels ◽  
Nanoporous Structure ◽  
Light Weight ◽  
Hydrogel Formation ◽  
Initial Processing

Silica aerogels using sodium silicates was synthesized by atmospheric-pressure drying. Granulation of silica aerogels was carried out in sequence of hydrogel formation, aging, surface modification, and drying. Rapidly prepared aerogels showed good properties in case aging and surface modification was done within 1 day. Drying is critical to aerogel granulation and the BET area of aerogel dried for a short duration had decreasing with time. It is suggested that sodium silicate-based aerogels granulation could be prepared within less than 5 days, half of initial processing. Aerogel granules had the average diameter of 1 mm and nearly spherical shape. It has very low thermal conductivity of 0.010 W/m⋅K, very light-weight and nanoporous structure with a porosity of upto 95%.

Highly flexible silica aerogels derived from methyltriethoxysilane and polydimethylsiloxane

2015 ◽  
Vol 39 (10) ◽  
pp. 7832-7838 ◽  
Author(s):  
Liang Zhong ◽  
Xiaohong Chen ◽  
Huaihe Song ◽  
Kang Guo ◽  
Zijun Hu
Keyword(s):  
Ambient Pressure ◽  
Silica Aerogels ◽  
Ambient Pressure Drying ◽  
Low Density ◽  
Rapid Synthesis ◽  
Hydrophobic Silica ◽  
Highly Hydrophobic

The rapid synthesis of low-density, highly hydrophobic silica aerogels was performedviaambient pressure drying.

Accelerating ion diffusion with unique three-dimensionally interconnected nanopores for self-membrane high-performance pseudocapacitors

Nanoscale ◽  
2017 ◽  
Vol 9 (46) ◽  
pp. 18311-18317 ◽  
Author(s):  
Yuan Gao ◽  
Yuanjing Lin ◽  
Zehua Peng ◽  
Qingfeng Zhou ◽  
Zhiyong Fan
Keyword(s):  
Aspect Ratio ◽  
Surface Area ◽  
Structural Stability ◽  
High Aspect Ratio ◽  
High Performance ◽  
Three Dimensional ◽  
Rate Capability ◽  
Large Surface Area ◽  
Nanoporous Structure ◽  
Ion Diffusion

Three-dimensional interconnected nanoporous structure (3-D INPOS) possesses high aspect ratio, large surface area, as well as good structural stability. Profiting from its unique interconnected architecture, the 3-D INPOS pseudocapacitor achieves a largely enhanced capacitance and rate capability.

NMR studies of superfluid in low density silica aerogels

2003 ◽  
Vol 329-333 ◽  
pp. 292-295
Author(s):  
J.E. Baumgardner ◽  
L.V. Polukhina ◽  
Y. Lee ◽  
J.F. Poco ◽  
L.W. Hrubesh ◽  
...  
Keyword(s):  
Silica Aerogels ◽  
Low Density ◽  
Nmr Studies
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