摘要
二氧化硅空心微球是由模板/溶胶?凝胶法制备的,其中模板选用的是阳离子型聚苯乙烯(PS),前驱体采用的是正硅酸乙酯(TEOS).二氧化硅空心微球的空腔大小由PS模板的尺寸决定,所以通过改变聚合反应的参数(单体、引发剂、稳定剂、分散介质的极性),可以制得粒径范围在0.71～1.80μm的二氧化硅空心微球.改变TEOS的浓度为0.4～0.8mmol/L,可以得到壁厚为20～60nm的二氧化硅空心微球.空心微球的粒径和壁厚将会影响粉体的堆积密度,而这同样会影响到以二氧化硅空心微球为原料制备的材料的热导率及强度.
Hollow silica spheres were synthesized by template/Sol-Gel approach,using cationic polystyrene（PS） as template and tetraethoxysilane（TEOS） as precursor.The void size of hollow silica sphere was decided by the diameter of their PS templates.Hollow silica spheres with controllable size between 0.71 μm and 1.8 μm were obtained by varying the parameters of polymerization（the monomer,the initiator,the stabilizer and the polarity of the dispersion medium）.The shell thickness of hollow silica spheres could be easily changed in the range of 20 nm to 60 nm by changing the TEOS concentration from 0.4 mmol/L to 0.8 mmol/L.Both the size and shell thickness of hollow silica spheres have effects on their bulk density,the thermal conductivity and strength of materials.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第8期885-891,共7页
Journal of Inorganic Materials
基金
Central Universities(YWF-10-B01)
关键词
二氧化硅空心微球
尺寸控制
壁厚
体积密度
hollow silica spheres
controllable size
shell thickness
bulk density
