ISSN: 1003-6326
CN: 43-1239/TG

Vol. 27    No. 6    June 2017

Preparation of submicrometer mesoporous silica microspheres and fitting calculation for elastic moduli
CHEN Yang1, CHEN Ai-lian2, QIN Jia-wei1, LI Ze-feng1
(1. School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China;
2. School of Mechanical Engineering, Changzhou University, Changzhou 213164, China
Abstract: The submicrometer mesoporous silica (mSiO2) microspheres were synthesized using cetyltrimethylammonium bromide as surface active agent under room temperature. The structural characteristics of the obtained samples were characterized by low-angle X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy and nitrogen adsorption-desorption methods. The results show that the particle size of mSiO2 microspheres with worm-like and radial channels is (316±11) nm, and the pore diameter of mesochannels is 2.5 nm. The elastic responses of mSiO2 microspheres deposited on a rigid substrate were evaluated by using an atomic force microscope. The compressive elastic modulus of individual microsphere was fitted and calculated by analyzing the AFM force-displacement curves on the basis of the Hertzain and Sneddon contact models. The results show that the average elastic moduli are 5.30 (Hertzain model) and 16.50 GPa (Sneddon model), which are comparable with the reported elastic moduli for mesoporous silica film materials (3-16 GPa).
Key words: mesoporous silica microsphere; radial channel; surface active agent; compressive elastic modulus
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
Managed by Central South University (CSU)