摘要
对于８５～１０００ｎｍ的无孔单分散二氧化硅颗粒，采用重力沉降、离心沉降和压片等方法制备了孔结构模型，并采用扫描电镜（ＳＥＭ）、Ｎ２吸附法和压汞法考察了模型的结构特点。这种孔结构模型完全排除了微孔的存在，孔分布集中，孔径大小随着颗粒粒径的变化而变化，但孔隙度与粒径基本无关。由这３种方法得到的孔结构模型的孔隙度均小于３５％，孔径都没有超出球形颗粒不同的有序排列形式的间隙孔尺寸的理论范围（０．１５５～０．７３２倍粒径）。颗粒粒径的大小。
he models for pore structures of 851 000 nm nonporous monodispersed silica
particles were made by using gravity settling, centrifugation and pelletization. The
characteristics of models were investigated by scanning electron microscopy (SEM), nitrogen
sorption and mercury porosimetry. The results indicate that there are no micropores in the
models, and the pores are narrowly distributed. Although the pore size changes with the particle
size, the porosity is almost independent of pore size. The porosities are all less than 35%. The
way of preparation and the size of particles have some influence on the pore structure of
models.\=
出处
《石油大学学报（自然科学版）》
CSCD
1999年第3期65-69,79,共6页
Journal of the University of Petroleum,China(Edition of Natural Science)
基金
国家自然科学基金
高校博士点基金
关键词
二氧化硅
孔分布
孔隙度
模型
孔结构
催化剂
silica
nonporous monodispersed particles
pore distribution
porosity
model
