CAJ | 학술논문

以正硅酸乙酯（TEOS）为硅源，无水乙醇为溶剂，硝酸为催化剂，氨水为凝胶剂，经溶胶-凝胶过程制备块状湿凝胶。再以三甲基氯硅烷（TMC S ）为疏水改性剂，3-氨丙基三羟基硅烷为亲水改性剂对制备的湿凝胶进行改性处理，最后经超临界CO2干燥得到块体SiO2气凝胶。考察了亲水改性剂加入量分别为0、0．15、0．75、1．5、2．70 mL时对块体SiO2气凝胶亲水性的影响，并通过扫描电子显微镜（SEM）、接触角、吸水率、红外光谱（FT-IR）等对气凝胶进行表征。结果表明：所得气凝胶块体具有纳米多孔结构，内部疏水（最大接触角可达123°），表面亲水，试样亲水性随亲水剂用量的增加而增大；同一试样亲水性存在一定的梯度变化，亲水性由内到外逐渐增强。
이정규산을지（TEOS）위규원，무수을순위용제，초산위최화제，안수위응효제，경용효-응효과정제비괴상습응효。재이삼갑기록규완（TMC S ）위소수개성제，3-안병기삼간기규완위친수개성제대제비적습응효진행개성처리，최후경초림계CO2간조득도괴체SiO2기응효。고찰료친수개성제가입량분별위0、0．15、0．75、1．5、2．70 mL시대괴체SiO2기응효친수성적영향，병통과소묘전자현미경（SEM）、접촉각、흡수솔、홍외광보（FT-IR）등대기응효진행표정。결과표명：소득기응효괴체구유납미다공결구，내부소수（최대접촉각가체123°），표면친수，시양친수성수친수제용량적증가이증대；동일시양친수성존재일정적제도변화，친수성유내도외축점증강。
Wet silica gel monoliths were prepared by sol-gel process using tetraethoxysilane (TEOS)as sil-ica source,absolute ethyl alcohol as solvent,nitrating acid as catalyzer,and ammonia as gelata.Then the wet gels were modified by trimethyl methylchlorosilane(TMCS)and 3-ammonia three hydroxyl propyl si-lane as hydrophobic modifier and hydrophilic modifier,respectively.After CO2 supercritical drying,silica aerogels were obtained.The impacts on hydrophilicity of silica aerogels with hydrophilic modifier dosages of 0,0.15,0.75,1.05 and 2.70 mL were investigated,respectively.Silica aerogels were characterized by scanning electron microscope (SEM),contact angle,water absorption rate,and infrared spectroscopy (FT-IR).The results show that:the prepared silica aerogels have nano-porous structures;the inner aerogel is hydrophobic (the maximum contact angle can reach 123°)and the surface is hydrophilic,the hydrophilicity of silica aerogels increases with the dosage of hydrophilic modifier increasing.There is a certain gradient change of hydrophilicity in the same specimen and the hydrophilicity increases from inner to outer.