Fabrication of hydrophobic alumina aerogel monoliths by surface modification and ambient pressure drying

2010 ◽  
Vol 256 (20) ◽  
pp. 5973-5977 ◽  
Author(s):  
Lina Wu ◽  
Yudong Huang ◽  
Zhijiang Wang ◽  
Li Liu ◽  
Huifang Xu
Keyword(s):  
Surface Modification ◽  
Ambient Pressure ◽  
Ambient Pressure Drying ◽  
Alumina Aerogel

Synthesis of low shrinkage monolith alumina aerogels by surface modification and ambient pressure drying

2018 ◽  
Vol 13 (9) ◽  
pp. 1240-1244
Author(s):  
Chi Li ◽  
Zheng Gong ◽  
Likang Ding ◽  
Donglai Guo ◽  
Wenbin Hu
Keyword(s):  
Surface Modification ◽  
Ambient Pressure ◽  
Ambient Pressure Drying ◽  
Alumina Aerogels

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°.

Preparation of monolithic titania aerogels with high surface area by a sol–gel process combined surface modification

RSC Advances ◽  
2014 ◽  
Vol 4 (62) ◽  
pp. 32934-32940 ◽  
Author(s):  
Hui Yang ◽  
Wenjun Zhu ◽  
Sai Sun ◽  
Xingzhong Guo
Keyword(s):  
Surface Modification ◽  
Surface Area ◽  
Ambient Pressure ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Ambient Pressure Drying ◽  
Sol Gel Process

Monolithic titania (TiO2) aerogels with high surface area were successfully synthesized by the sol–gel process combined surface modification, followed by ambient pressure drying.

Characterization and comparison of uniform hydrophilic/hydrophobic transparent silica aerogel beads: skeleton strength and surface modification

RSC Advances ◽  
2015 ◽  
Vol 5 (68) ◽  
pp. 55579-55587 ◽  
Author(s):  
Sekai Zong ◽  
Wei Wei ◽  
Zhifeng Jiang ◽  
Zaoxue Yan ◽  
Jianjun Zhu ◽  
...  
Keyword(s):  
Surface Modification ◽  
Industrial Production ◽  
Silica Aerogel ◽  
Large Scale ◽  
Preparation Method ◽  
Ambient Pressure ◽  
Ambient Pressure Drying ◽  
Silica Beads

This preparation method of skeleton improvement of wet silica beads by ambient pressure drying is suitable for economic and large-scale industrial production of silica aerogel beads.

Facile synthesis of silica aerogel composites via ambient-pressure drying without surface modification or solvent exchange

Vacuum ◽  
2020 ◽  
Vol 173 ◽  
pp. 109117 ◽  
Author(s):  
Dongxuan Du ◽  
Yonggang Jiang ◽  
Junzong Feng ◽  
Liangjun Li ◽  
Jian Feng
Keyword(s):  
Surface Modification ◽  
Silica Aerogel ◽  
Ambient Pressure ◽  
Ambient Pressure Drying ◽  
Solvent Exchange ◽  
Facile Synthesis

scholarly journals Efficient preparation of crack-free, low-density and transparent polymethylsilsesquioxane aerogels via ambient pressure drying and surface modification

RSC Advances ◽  
2018 ◽  
Vol 8 (32) ◽  
pp. 17967-17975 ◽  
Author(s):  
Tiemin Li ◽  
Ai Du ◽  
Ting Zhang ◽  
Wenhui Ding ◽  
Mingfang Liu ◽  
...  
Keyword(s):  
Surface Modification ◽  
Ambient Pressure ◽  
Ambient Pressure Drying ◽  
Low Density

A low-density (48 mg cm−3) polymethylsilsesquioxane aerogel was prepared by ambient pressure drying and surface modification.

scholarly journals Facile Preparation of High Strength Silica Aerogel Composites via a Water Solvent System and Ambient Pressure Drying without Surface Modification or Solvent Replacement

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3983
Author(s):  
Dongxuan Du ◽  
Fengqi Liu ◽  
Yonggang Jiang ◽  
Junzong Feng ◽  
Liangjun Li ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Surface Modification ◽  
Silica Aerogel ◽  
Ambient Pressure ◽  
High Strength ◽  
Ambient Pressure Drying ◽  
Synthesis Process ◽  
Insulation Material ◽  
Fiber Density ◽  
Solvent Replacement

To further reduce the manufacturing cost and improve safety, silica aerogel composites (SAC) with low density and low thermal conductivity synthesized via ambient pressure drying (APD) technology have gradually become one of the most focused research areas. As a solvent, ethanol is flammable and needs to be replaced by other low surface tension solvents, which is dangerous and time-consuming. Therefore, the key steps of solvent replacement and surface modification in the APD process need to be simplified. Here, we demonstrate a facile strategy for preparing high strength mullite fiber reinforced SAC, which is synthesized by APD using water as a solvent, rather than using surface modification or solvent replacement. The effects of the fiber density on the physical properties, mechanical properties, and thermal conductivities of SAC are discussed in detail. The results show that when the fiber density of SAC is 0.24 g/cm3, the thermal conductivity at 1100 °C is 0.127 W/m·K, and the compressive strength at 10% strain is 1.348 MPa. Because of the simple synthesis process and excellent thermal-mechanical performance, the SAC is expected to be used as an efficient and economical insulation material.

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