| 초록 |
Highly porous silica aerogel with nano-sized pore structure has drawn attention for thethermal insulator application.In preparation of aerogel hybrid coating materials for the thermal insulations, however, the incorporation of hydrophobic aerogel with organic polar binders isvery limited due todisimilar surface property between two materials. Accordingly, the surface modification of the aerogelis requiredtoobtain compatible aerogelhybrid coating sols. In this study, the surface of aerogelparticles was modified by usingsurfactant adsoption and heat treatment methods.Four different types of relativelylong chainsurfactants with various HLBwere used to hinder the penetration of them into the nano-sized pores. The surface property of aerogel was evaluated in terms ofobservationfor dispersion,contact angleand FT-IR measurement. Insurface modificationvia surfactants, the effects of surfactant types andcontent, andmixing time as process parameter on the degree ofhydrophobicity or hydrophilicityfor theaerogel. In addition, the temperature in heat treatment process was revealed to be significant parameter to preparehighly hydrophilic aerogel. |
