(1. 常州大學(xué) 材料科學(xué)與工程學(xué)院，常州 213164；
2. 常州大學(xué) 機械工程學(xué)院，常州 213164)
摘 要: 在室溫條件下以十六烷基三甲基溴化銨為表面活性劑制備亞微米級介孔二氧化硅(mSiO2)微球，通過小角XRD、FESEM、TEM和孔分布測試等手段對樣品進行結(jié)構(gòu)表征。結(jié)果表明：所得mSiO2微球的粒徑為(316±11) nm，樣品內(nèi)部存在蠕蟲狀放射狀介孔孔道，其孔徑多集中在2.5 nm。利用AFM力曲線測試技術(shù)對單個mSiO2微球的彈性響應(yīng)進行評價，通過解析所記錄的力—位移曲線，分別結(jié)合Hertzain模型和Sneddon模型對樣品的壓縮彈性模量進行擬合計算。利用Hertzain彈性接觸模型計算得出的彈性模量平均值為5.30 GPa，在Sneddon模型條件下獲得的彈性模量平均值為16.50 GPa，與現(xiàn)有文獻中關(guān)于介孔氧化硅薄膜材料彈性模量的報道值(3~16 GPa)基本相當。
關(guān)鍵字: 介孔氧化硅微球；放射狀孔道；表面活性劑；壓縮彈性模量
（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
