Water molecular bridge undermines thermal insulation of Nano-porous silica aerogels

2021 ◽  
pp. 118176
Author(s):  
M.Y. Yang ◽  
Q. Sheng ◽  
H. Zhang ◽  
G.H. Tang
Keyword(s):  
Thermal Insulation ◽  
Porous Silica ◽  
Silica Aerogels ◽  
Molecular Bridge

scholarly journals Cellulose Aerogels for Thermal Insulation in Buildings: Trends and Challenges

Coatings ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 345 ◽  
Author(s):  
Danny Illera ◽  
Jaime Mesa ◽  
Humberto Gomez ◽  
Heriberto Maury
Keyword(s):  
Thermal Stability ◽  
Thermal Insulation ◽  
Gaseous Phase ◽  
Energy Demand ◽  
Cost Effective ◽  
Silica Aerogels ◽  
Moisture Sensitivity ◽  
Knudsen Effect ◽  
Cellulose Aerogel ◽  
Current Trends

Cellulose-based aerogels hold the potential to become a cost-effective bio-based solution for thermal insulation in buildings. Low thermal conductivities (<0.025 W·m−1·K−1) are achieved through a decrease in gaseous phase contribution, exploiting the Knudsen effect. However, several challenges need to be overcome: production energy demand and cost, moisture sensitivity, flammability, and thermal stability. Herein, a description and discussion of current trends and challenges in cellulose aerogel research for thermal insulation are presented, gathered from studies reported within the last five years. The text is divided into three main sections: (i) an overview of thermal performance of cellulose aerogels, (ii) an identification of challenges and possible solutions for cellulose aerogel thermal insulation, and (iii) a brief description of cellulose/silica aerogels.

Bimetallic FeCo Nanocrystals Supported on Highly Porous Silica Aerogels as Fischer–Tropsch Catalysts

2012 ◽  
Vol 142 (9) ◽  
pp. 1061-1066 ◽  
Author(s):  
Danilo Loche ◽  
Maria F. Casula ◽  
Anna Corrias ◽  
Sergio Marras ◽  
Pietro Moggi
Keyword(s):  
Porous Silica ◽  
Silica Aerogels ◽  
Fischer Tropsch ◽  
Highly Porous

Flexible porous aerogels decorated with Ag nanoparticles as an effective SERS substrate for label-free trace explosives detection

2020 ◽  
Vol 12 (33) ◽  
pp. 4123-4129
Author(s):  
Wei Liu ◽  
Zihao Song ◽  
Yifan Zhao ◽  
Yu Liu ◽  
Xuan He ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Porous Silica ◽  
Silica Aerogels ◽  
Explosives Detection ◽  
Sers Substrate ◽  
Label Free ◽  
Ag Nanoparticle ◽  
Label Free Detection ◽  
Trace Explosives

Ag nanoparticle decorated porous silica aerogels as a flexible SERS substrate for sensitive, stable and label-free detection of explosive NTO was reported. And this substrate has a certain application prospect in the field of explosives sensing.

scholarly journals Advanced three dimensional characterization of silica-based ultraporous materials

RSC Advances ◽  
2016 ◽  
Vol 6 (13) ◽  
pp. 10625-10632 ◽  
Author(s):  
L. Roiban ◽  
G. Foray ◽  
Q. Rong ◽  
A. Perret ◽  
D. Ihiawakrim ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Porous Silica ◽  
Silica Aerogels ◽  
Energy Losses

Whatever the field of application in building, transportation, packaging, etc., the energy losses must be reduced. In this context, the development of superinsulating materials is mandatory. Ultra-porous silica aerogels are good candidates.

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.

Sign in / Sign up

Export Citation Format

Share Document