Tuning the properties of silica aerogels through pH controlled sol-gel processes
Makaleler > Tam Makale · 2020
Yazarlar: Fatoş Koç, Selay SERT ÇOK, Nilay GİZLİ
Research on Engineering Structures and Materials, Uluslararası, Scopus, 2020
DOI: 10.17515/resm2019.166ma1203
Özet
In this study, silica aerogels were produced by two-step sol-gel method to investigate the effect of pH on the physical, chemical and textural structure of aerogels.Tetraethyl orthosilicate (TEOS) used as a silica source.(3aminopropyl) triethoxysilane (APTES) acted as a silica co-precursor.The quantity of sol precursors kept constant through the experiments and the pH of hydrolysis and condensation reactions were varied.As a result of the experimental studies, the optimum pH values to achieve monolithic aerogel were obtained when the pH of hydrolysis is 3 and the pH of condensation is 10.Physical, chemical and morphological characteristics of the samples were examined by performing FTIR and SEM and density analyses.Results showed that the sample SG-pH3/7 had also well-defined porous structure with homogenous pore distribution, a stable lightweight and monolithic form.