Preparation of Silica Hollow Microspheres with Special Surface Morphology by Biotemplate Method
Preparation of Silica Hollow Microspheres with Special Surface Morphology by Biotemplate Method
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DOI：
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发表时间：
2009
影响因子：
1.7
通讯作者：
Lizi Dong
中科院分区：
文献类型：
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作者：
Lizi Dong
以油菜花粉为生物模板，采用溶胶-凝胶法制备了具有表面结构的SiO2空心微球，并通过改变硅溶胶中正硅酸乙酯（TEOS）与水的比例，制备了不同表面形貌的SiO2空心微球，采用差示扫描量热法（DSC）、热重分析法（TG）、扫描电镜（SEM）、扫描电子显微镜（SEM用能谱仪（EDS）和扫描电镜（SEM）对花粉粒和花粉囊进行了表征。结果表明，花粉粒内壁的形态结构与花粉粒内壁的形态结构一致，在200℃下完全去除，花粉粒内部形成中空结构，花粉粒外壁在较高温度下仍保持网状结构，使微球表面微观结构的复制成为可能，沿着胶体颗粒沉积在花粉粒表面的数量，二氧化硅中空微球表面特殊的表面形貌可调。
Surface structured silica hollow microspheres were synthesized using the rape pollen grain as a biotemplate via a facile sol-gel method and a succedent calcinations process.Different surface morphologies were also achieved on the as-prepared silica microspheres by changing the ratio of tetraethyl orthosilicate(TEOS) to water in the silica sols.Differential scanning calorimetry(DSC),thermogravity(TG),energy disperse spectroscope(EDS) and scanning electron microscope(SEM) were used to characterize the pollen grain and the as-prepared silica hollow microspheres.The mechanism of morphology controlling in the microspheres fabrication was discussed in detail.The results indicate that the intine of pollen grain will be removed totally at 200℃,as a consequence hollow structure can be achieved in pollen grain.And the exine of pollen grain with the net-like morphology can be maintained under higher temperature,which makes the replication of the microstructure on microspheres surface possible.Along with quantity of colloidal particles deposited on pollen grain,the special surface morphology on the silica hollow microspheres will be adjustable.