scholarly journals Preparation of transparent monolithic methylsilsesquioxane (MSQ) aerogels via ambient pressure drying

RSC Advances ◽  
2017 ◽  
Vol 7 (52) ◽  
pp. 32861-32865 ◽  
Author(s):  
Tao Zhang ◽  
Hua Yuan ◽  
Shuangqing Wang ◽  
Xudong Guo ◽  
Rui Hu ◽  
...  
Keyword(s):  
Ambient Pressure ◽  
Ambient Pressure Drying ◽  
Good Stability ◽  
Drying Method ◽  
Hydrophobic Aerogels

Transparent monolithic MSQ aerogels were prepared by an ambient pressure drying method. The obtained hydrophobic aerogels showed good stability to various aggressive environments.

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

Cellulose nanofibril reinforced silica aerogels: optimization of the preparation process evaluated by a response surface methodology

RSC Advances ◽  
2016 ◽  
Vol 6 (102) ◽  
pp. 100326-100333 ◽  
Author(s):  
Jingjing Fu ◽  
Chunxia He ◽  
Jingda Huang ◽  
Zhilin Chen ◽  
Siqun Wang
Keyword(s):  
Mechanical Properties ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Ambient Pressure ◽  
Silica Aerogels ◽  
Ambient Pressure Drying ◽  
Preparation Process ◽  
Cellulose Nanofibril ◽  
Drying Method ◽  
Composite Aerogels

CNF–silica composite aerogels with reinforced mechanical properties were prepared under an ambient pressure drying method and optimized by a response surface methodology.

The effect of pH on the physicochemical properties of silica aerogels prepared by an ambient pressure drying method

2007 ◽  
Vol 61 (14-15) ◽  
pp. 3130-3133 ◽  
Author(s):  
Seunghun Lee ◽  
Young Chul Cha ◽  
Hae Jin Hwang ◽  
Ji-Woong Moon ◽  
In Sub Han
Keyword(s):  
Physicochemical Properties ◽  
Ambient Pressure ◽  
Silica Aerogels ◽  
Ambient Pressure Drying ◽  
Drying Method ◽  
Effect Of Ph

Solvents Effects on Physicochemical Properties of Nano-Porous Silica Aerogels Prepared by Ambient Pressure Drying Method

2006 ◽  
Vol 510-511 ◽  
pp. 910-913 ◽  
Author(s):  
Seung Hun Lee ◽  
Eun A Lee ◽  
Hae Jin Hwang ◽  
Ji Woong Moon ◽  
In Sub Han ◽  
...  
Keyword(s):  
Ph Value ◽  
Ambient Pressure ◽  
Average Pore Size ◽  
Porous Silica ◽  
Sodium Silicate Solution ◽  
Silicate Solution ◽  
Silica Aerogels ◽  
Ambient Pressure Drying ◽  
Drying Method ◽  
Average Pore

Hydrophobic silica aerogels were synthesized by an ambient pressure drying method from silicic acid with a different pH value, which was prepared from sodium silicate solution (water glass). In this study we chose various hydrocarbon class solvents such as pentane, hexane, heptane, and toluene, and performed surface modification in TMCS (trimethylchlorosilane)/solvent solutions in order to improve reproducibility in aerogel production. Densities of the aerogels were about 0.1 ~ 0.3 g/cm3 , and apparent porosities were 88 ~ 96 %, depending on the processing conditions. Specific surface area was approximately 730 ~ 950 m2/g, and average pore size around 10 nm.

scholarly journals Thermal Conductivity Performance of Silica Aerogel after Exposition on Different Heating under Ambient Pressure

2019 ◽  
Vol 16 (3(Suppl.)) ◽  
pp. 0770 ◽  
Author(s):  
Israa F. Al-sharuee
Keyword(s):  
Thermal Conductivity ◽  
Silica Aerogel ◽  
Ambient Pressure ◽  
Ambient Pressure Drying ◽  
Drying Method ◽  
Insulation Property ◽  
M 10 ◽  
Basic Characteristics ◽  
Thermal Insulation Property ◽  
Quality Material

         The varied thermal conductivity (insulation) of silica aerogel with heating for different pH has been investigated, it has been depended on ambient pressure drying method in the preparing silica aerogel samples, also six different pH of samples (1, 2, 3, 7, 8 and 9) were treated under five degree of heating with (50,100,150,200 and 250) ᴼC. This technique is important to test the carry-outs hydrophobic silica to temperature without high-quality material changes in the basic characteristics. The hot-wire technique is used in this work to examine the thermal conductivity, Fourier Transform Infrared Spectroscopy (FTIR) depended to characterize the bonds and their artificial by heating. Results show that the samples affected by heating through decreasing the density leading to obtaining more insulation metal, moreover varied pH is an important role in thermal conductivity. The average thermal conductivity of all aerogel samples in this work is (0.01- 0.0061 mW m-10 C-1) this means that it is still below thermal conductivity for air equals to (0.02257) mW m-10 C-1 . Meanwhile, we concluded that the insulation property of silica aerogel is affected by heat treatment and gives it more thermal insulation property.

Synthesis of Silica Aerogel Thin Film from Waterglass

2007 ◽  
Vol 124-126 ◽  
pp. 671-674 ◽  
Author(s):  
Young Chul Cha ◽  
Chul Eui Kim ◽  
Seung Hun Lee ◽  
Hae Jin Hwang ◽  
Ji Woong Moon ◽  
...  
Keyword(s):  
Thin Film ◽  
Water Glass ◽  
Ph Value ◽  
Ambient Pressure ◽  
Silica Aerogels ◽  
Dip Coating ◽  
Ambient Pressure Drying ◽  
Drying Method ◽  
Silica Precursor ◽  
Dip Coating Technique

Hydrophobic thin film silica aerogels were synthesized by ambient pressure drying method from silicic acid which was prepared from sodium silicate (water glass) solution. The pH value of the silica precursor sol was adjusted to make a spinable sol, and gel films were coated on a glass substrate by dip coating technique. Aerogel-like thin films with the thickness of about 1 μm could be successfully fabricated by repeating the dip coating process three times.

scholarly journals Effect of sodium bicarbonate solution on methyltrimethoxysilane-derived silica aerogels dried at ambient pressure

2021 ◽  
Author(s):  
Yujing Liu ◽  
Xiao Han ◽  
Balati Kuerbanjiang ◽  
Vlado K. Lazarov ◽  
Lidija Šiller
Keyword(s):  
Contact Angle ◽  
Sodium Bicarbonate ◽  
Pore Diameter ◽  
Ambient Pressure ◽  
Sodium Bicarbonate Solution ◽  
Hydrophobic Surface ◽  
Silica Aerogels ◽  
Ambient Pressure Drying ◽  
Drying Method ◽  
Average Pore

AbstractHere we present an economical ambient pressure drying method of preparing monolithic silica aerogels from methyltrimethoxysilane precursor while using sodium bicarbonate solution as the exchanging solvent. We prepared silica aerogels with a density and a specific surface area of 0.053 g·cm−3 and 423 m2·g−1, respectively. The average pore diameter of silica aerogels is 23 nm as the pore specific volume is 1.11 cm3·g−1. Further, the contact angle between water droplet and the surface of silica aerogels in specific condition can be as high as 166°, which indicates a super-hydrophobic surface of aerogels.

Effect of drying method on the structure and porous texture of silica-polybutadiene hybrid gels: Supercritical vs. ambient pressure drying

2017 ◽  
Vol 460 ◽  
pp. 119-124 ◽  
Author(s):  
Mahnaz Shahzamani ◽  
Rouhollah Bagheri ◽  
Mahmood Masoomi ◽  
Majid Haghgoo ◽  
Akram Dourani
Keyword(s):  
Ambient Pressure ◽  
Ambient Pressure Drying ◽  
Drying Method ◽  
Hybrid Gels ◽  
Porous Texture
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