本論文以陽離子型界面活性劑合成中孔洞MCM-41二氧化矽奈米顆粒。透過改變反應物的濃度，對其顆粒大小進行調控。另外，我們發現藉由添加非離子型界面活性劑，可以調控中孔洞二氧化矽的孔洞結構。其中，我們可成功地合成出具有新穎c2mm結構且橢圓形孔洞截面的中孔洞二氧化矽奈米顆粒。我們以X光小角度散射/繞射實驗探討其合成過程中的結構演化。我們利用X光粉末繞射圖譜及穿透式電子顯微鏡對此一特殊結構加以確認，而SEM鑑定顯示產物有球狀與棒狀兩種規則的外觀形貌。我們更進一步將Pt嵌入具有c2mm結構之二氧化矽奈米顆粒中，觀察到球狀二氧化矽顆粒其孔道連接方式為連續式的迴圈，棒狀二氧化矽顆粒中則為具有掌性的孔洞結構。

We have synthesized highly ordered mesoporous MCM-41 silica nanoparticles with controlled particle sizes by tuning the concentrations of the reactants. In addition, by mixing non-ionic surfactants with the cationic surfactant cetyltrimethylammoium bromide, the structure of the resulting mesoporous silicas can be tailored. Interestingly, we have successfully prepared mesoporous silica nanoparticles with a novel two-dimensional rectangular c2mm structure and elliptical pore section. In-situ small angle X-ray scattering/diffraction measurements have been applied to follow the structural evolution during the synthesis of the material, and the c2mm structure of the final product has been confirmed by powder X-ray diffraction and transmission electron microscopy. Furthermore, the scanning electron microscopic studies have shown that most of the c2mm mesoporous silica nanoparticles are spherical in shape and uniform in size, and only few particles with rod shape have been observed. We have also infiltrated platinum into the c2mm mesoporous silica nanoparticles, which clearly show that while the mesopore channels in the spherical nanoparticles are circular around the center axis, those in the rod-like nanoparticles have a chiral morphology.

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