A versatile ambient pressure drying approach to synthesize silica-based composite aerogels

RSC Advances ◽  
2014 ◽  
Vol 4 (93) ◽  
pp. 51146-51155 ◽  
Author(s):  
Jin Wang ◽  
Yong Wei ◽  
Weina He ◽  
Xuetong Zhang
Keyword(s):  
Ambient Pressure ◽  
Ambient Pressure Drying ◽  
Large Pore ◽  
Composite Aerogels

A general ambient pressure drying approach to synthesize silica-based composite aerogels with high BET surfaces and large pore volumes has been reported.

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.

scholarly journals Synthesis of sodium silicate-based silica aerogels with graphene oxide by ambient pressure drying

2021 ◽  
Author(s):  
Oznur Kaya Cakmak ◽  
Khalil T. Hassan ◽  
Jiabin Wang ◽  
Xiao Han ◽  
Lidija Šiller
Keyword(s):  
Graphene Oxide ◽  
Surface Area ◽  
Sodium Silicate ◽  
Ambient Pressure ◽  
Physical And Mechanical Properties ◽  
Silica Aerogels ◽  
Ambient Pressure Drying ◽  
Silica Matrix ◽  
X Ray Diffraction ◽  
Composite Aerogels

AbstractHere we study how graphene oxide affects silica aerogels and their physical and mechanical properties by examining volume shrinkage, pore volume, surface area and compressive strength of these composite aerogels. Composite aerogels were made through adding different amount of graphene oxide (GO) to sodium silicate precursor by using ambient pressure drying method. Additionally, the chemical composition of the composite aerogels was determined using X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. A rougher structure was observed when the GO loading increased and the characteristic peak of GO in XRD disappeared due to the random distribution of GO within the silica matrix. FTIR spectrum of composite aerogels shows that the relative intensity of silanol groups on the silica matrix have downward tendency with the addition of GO. The specific surface area had maxima with the addition of 0.01 wt% GO surface area to 578 m2 /g. The mechanical strength of aerogels was increased, with the loading of GO from 0.0 wt% to 0.2 wt%, and the compressive modulus increased from 0.02 MPa to 0.22 MPa.

Pore Structure Characterization of TiO2-SiO2 Composite Aerogel Prepared via Ambient Pressure Drying by Sol Pre-Modification Process

2012 ◽  
Vol 534 ◽  
pp. 101-105 ◽  
Author(s):  
Jing Xiao Liu ◽  
Lu Nan Bai ◽  
Fei Shi ◽  
Zhi Qiang Hu ◽  
Yan Yan Jiang ◽  
...  
Keyword(s):  
Specific Surface ◽  
Pore Structure ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Ambient Pressure ◽  
Volume Ratio ◽  
Ambient Pressure Drying ◽  
Composite Aerogel ◽  
Composite Aerogels

In this paper, TiO2-SiO2composite aerogels were prepared via ambient pressure drying by sol-gel and sol pre-modification method. The pre-modification solution consists of hexamethyldisiloxane (HMDSO) as buffering agent, trimethylchlorosilane (TMCS) as modifier and hexane as organic solvent. The pore structure of TiO2-SiO2composite aerogels was characterized by N2adsorption-desorption method. The effects of HMDSO/TMCS volume ratio on the pore structure and properties of TiO2-SiO2composite aerogel were studied. The results indicate that the pre-modification of TiO2-SiO2composite sol by adding HMDSO/TMCS/Hexane solution could shorten the preparation period. Increasing the amount of HMDSO is favorable for obtaining TiO2-SiO2composite aerogel with higher specific surface area and pore volume. The best volume ratio of HMDSO/TMCS/composite sol for preparing mesoporous TiO2-SiO2composite aerogels were 12:6:120 and 12:12:120, with which the specific surface area and pore volume of the obtained TiO2-SiO2composite aerogel are 425.2～645.4 m2/g and 0.80～2.85 m3/g, respectively.

Preparation and Characterization of SiO2-WO3 Composite Aerogel by Ambient Pressure Drying Process

2012 ◽  
Vol 534 ◽  
pp. 205-208 ◽  
Author(s):  
Fei Shi ◽  
Lu Nan Bai ◽  
Jing Xiao Liu ◽  
Xiao Li Dong ◽  
Jia Yu Luo ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Raw Materials ◽  
Ambient Pressure ◽  
Sol Gel ◽  
Ambient Pressure Drying ◽  
Drying Process ◽  
Pore Characteristics ◽  
Composite Aerogel ◽  
Composite Aerogels

Using sodium tungsten and industrial water glass as raw materials, SiO2-WO3 composite aerogels were prepared by ambient pressure drying process. The hexamethyldisilazane(HMDSZ)/hexamethyldisiloxane(HMDSO)/hexane mixing solution was used to modify the sol-gel-derived SiO2-WO3 wet gel. The microstructure, morphology and pore characteristics of the obtained SiO2-WO3 composite aerogels were investigated by XRD, SEM, FTIR and BET N2 adsorption-desorption analysis. The adsorption/photocatalytic degradation for Rhodamine B of SiO2-WO3 composite aerogel was investigated. The results indicate that mesoporous SiO2-WO3 composite aerogel with specific surface area 660.8 m2/g and pore volume 1.94 cm3/g could be prepared by using HMDSZ/HMDSO/hexane mixing solution to modify the wet gel. The obtained SiO2-WO3 composite aerogels have good adsorption/photocatalytic degradation for Rhodamine B than that of pure WO3 aerogel.

SiO2/TiO2 composite aerogels: Preparation via ambient pressure drying and photocatalytic performance

2014 ◽  
Vol 40 (9) ◽  
pp. 13781-13786 ◽  
Author(s):  
Shengjun Cheng ◽  
Xinling Liu ◽  
Shan Yun ◽  
Hongjie Luo ◽  
Yanfeng Gao
Keyword(s):  
Photocatalytic Performance ◽  
Ambient Pressure ◽  
Ambient Pressure Drying ◽  
Composite Aerogels

Transparent, ultraflexible, and superinsulating nanofibrous biocomposite aerogels via ambient pressure drying

2021 ◽  
Author(s):  
Guoqing Zu ◽  
Sheng Zeng ◽  
Ben Yang ◽  
Jia Huang
Keyword(s):  
Ambient Pressure ◽  
Ambient Pressure Drying ◽  
Oxidized Starch ◽  
Nanofibrous Structure ◽  
First Time ◽  
Highly Porous

We report transparent, flexible, and superinsulating biocomposite aerogels with a homogeneous, highly porous, and nanofibrous structure based on oxidized starch and polyorganosiloxane via facile ambient pressure drying for the first time.

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