摘要
Silica aerogel with different hydrophilicities were prepared from tetramethoxysilane,Methymethoxysilane,tetramethoxysilane-propyltrimethoxysilane,or tetramethoxysilane-phenyltrimethoxysilane mixtures via supercritical drying process(labelled as TMOS-AG Me-TMOS-AG,Pr-TMOS-AG,or Ph-TMOS-AG,respectively).Three fragrances,including geraniol,ethyl vanillin,and menthol,were loaded to TMOS-AG.The thermal analysis confirmed all loading fragrances are stable until over 200℃.And among all fragrances,geraniol presented the maximum loading contents(L_(m)).Concentration dependences indicated the geraniol was mono layer absorbed.Py-GC/MS of geraniol in TMOS-AG under both N_(2)and mimic air atmosphere(90%N_(2)and 10%O_(2))confirmed that loaded geraniol could be thermally controlled-released beginning at 200℃.As N_(2)absorption confirmed,even absorption/desorption equilibrium constant(k)was determined mainly by hydrophilicity of silica aerogels,and the maximum loading contents(L_(m))were influenced more by the pore size.Due to mono layered absorption,bigger pores usually give less specific areas and less absorbing sites for geraniol,and then present lower L_(m).
作者
黄龙
ZHANG Jing
PANG Denghong
XIONG Man
BIE Xuan
DONG Yawei
WANG Ben
罗诚浩
黄荣华
HUANG Long;ZHANG Jing;PANG Denghong;XIONG Man;BIE Xuan;DONG Yawei;WANG Ben;LUO Chenghao;HUANG Ronghua(China Tobacco Hubei Industrial Co.,Ltd,Wuhan,430040,China;School of Power&Mechanical Engineering,Wuhan University,Wuhan,430072,China;School of Materials Science and Engineering,Hubei University,Wuhan,430060,China)