本篇論文中，分別探討雙邊不對稱球體之誘發性與自發性自組裝行為，利用外在磁場誘發磁性不對稱球體進行誘發性自組裝，及帶有電荷之不對稱球體與其相異電荷之球體產生自發性自組裝行為。不對稱球體由熱陷入及表面改質製備而成，使平均粒徑為500nm的二氧化矽球體半球表面改質上氨基-矽烷或分別將兩半球表面改質接上四氧化三鐵磁性奈米粒子及螢光染料。
帶有正電荷氨基之不對稱球體與平均粒徑100nm之負電荷硫酸根聚苯乙烯進行靜電吸引自發性自組裝，藉由光散射粒徑分析儀觀測粒徑分布及其自組裝行為，改變兩球體在溶液中的數量比例，呈現出異向性材料其獨特自組裝行為，可形成半球吸附的釋迦狀結構、四面體或更大團聚等，兩球體之動態自組裝過程中亦同時證明其中有介穩態形成。在誘發性自組裝部分，由原子力顯微鏡和穿透式電子顯微鏡證實在一定外在磁場大小及溶液濃度下，磁性不對稱球體會被誘發自組裝為葡萄狀排列，因此在此篇論文中，會探討其不對稱球體自組裝行為在操控機制下之自組裝行為。

Field-induced and spontaneous self-assemblies of asymmetric Janus particles were investigated in this research work. An external magnetic field was utilized to manipulate Janus particles hemispherically functionalized with magnets. Janus particles with ionic hemispheric surfaces were assembled with fully-charged colloids. Material preparations involved the sequentially-arranged particle-embedding and surface-modification processes. Silica particles with the average diameter of 500 nm were hemispherically functionalized with the amino-silane or were bi-functionalized with Fe3O4 nanoparticles and fluorescent dye moieties individually on the two hemispheric surfaces. Fully-charged substances were the polystyrene (PS) sulfate particles with 100 nm in diameter. Spontaneous self-assembly via the electrostatic interactions from amino-functionalized Janus particles and sulfated PS particles was investigated and monitored by the light-scattering particle size analyzer. Variations in the amino-Janus and PS particle ratios in the aqueous media revealed the unique assembly behaviors of these asymmetric materials. The different assembled clusters were identified as the “Buddha-head-like” hemisphere assembly, dimer, trimer, tetrahedron tetramer, or larger clusters. Dynamic self-assembly behaviors of amino-Janus and PS particles also evidenced the metastable cluster formation. Field-induced self-assembly, on the other hand, demonstrated the grape-like alignment of the magnetic-Janus particles as functions of the magnetic field and the particle concentration as shown in the TEM and AFM. Self-assemblies of these asymmetric submicron particles under the controlled mechanisms were demonstrated and examined in this research work.

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