Modelling and optimisation of sodium silicate based silica aerogel synthesis using response surface methodology

The purpose of this work was to model and optimise the preparation of silica aerogel using low-cost material and modified sol–gel process. A central composite design was employed to optimise the synthesis factors. Among all factors discussed in literatures, silica concentration, gelation time and hy...

Full description

Saved in:
Bibliographic Details
Published in:Micro & nano letters 2018-06, Vol.13 (6), p.853-856
Main Authors: Mirzaee, Seyed Saeed, Salahi, Esmaeil, Khanlarkhani, Ali
Format: Article
Language:English
Subjects:
Aerogels
BET analysis
composite design
Density
Design modifications
Design optimization
Gelation
gelation time
optimisation
quadratic regression model
Regression analysis
Regression models
Response surface methodology
silica aerogel synthesis
silica concentration
Silica gel
silicon compounds
Silicon dioxide
SiO2
sodium silicate
Sodium silicates
Sol-gel processes
sol‐gel process
sol‐gel processing
specific surface area
Synthesis
TMCS
Citations: Items that this one cites
Items that cite this one
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The purpose of this work was to model and optimise the preparation of silica aerogel using low-cost material and modified sol–gel process. A central composite design was employed to optimise the synthesis factors. Among all factors discussed in literatures, silica concentration, gelation time and hydrophobic agent amount were the most efficacious ones. All experiments were performed at the same conditions, but the elected factors were varied in five levels. The response (density of silica aerogel) was fitted by quadratic regression model to find the optimal condition. Computation results showed that the minimum density of silica aerogel was achieved at silica concentration of 4.12 g/l, acid amount of 14.46 ml and trimethylchlorosilane (TMCS) consumption of 10.39 ml. The best density of silica aerogel was 0.078915 g/cm3 and the specific surface area determined by Brunauer–Emmett–Teller (BET) analysis was 780 m2/g.
ISSN:1750-0443
1750-0443
DOI:10.1049/mnl.2018.0093