摘要
在氨水和氨气催化下使单晶硅粉水解,合成了单分散、高纯的纳米二氧化硅水溶胶;再利用聚合诱导胶体凝聚法(PICA)制备单分散脲醛二氧化硅复合微球,经过高温煅烧后得到球形硅胶色谱柱填料.通过电感耦合等离子-质谱(ICP-MS)、电子显微镜和BET比表面积测试等手段对球形硅胶的纯度、粒径分布及比表面积进行了表征,并通过色谱分离对硅胶填料的性能进行了评价.实验结果表明,该方法合成的色谱柱填料具有纯度高、粒径分布均匀、机械强度高及分离能力强等优点.
Using silicon powder as silica source,monodisperse and high-purity nano-silica sol was synthesized under catalysis of aqueous ammonia and ammonia gas.The urea-formaldehyde polymer/SiO2 composite microspheres were prepared after polymerization-induced colloid aggregation（PICA） method in acidic media,and the spherical silica packing material was produced after calcining at high temperature.The purity of monodisperse nano-silica sol was tested by inductively coupled plasma mass spectrometry（ICP-MS）,and the size and shape of the composite microspheres were characterized by scanning electron microscope（SEM）.The performance of silica packing material was evaluated by non-chromatographic method（BET） and chromatographic method.The results show that the silica packing material has high purity,uniformity and high mechanical strength.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第4期689-694,共6页
Chemical Journal of Chinese Universities
关键词
单晶硅粉
聚合诱导胶体凝聚法
硅胶柱填料
Silicon powder
Polymerization-induced colloid aggregation（PICA）
Silica packing material
