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研究生:蕭雅云
研究生(外文):Ya-Yun Siao
論文名稱:以油滴及生物模板製備二氧化矽中空奈米粒子
論文名稱(外文):Preparation of Hollow Silica Nanoparticles Using Oil- and Bio-Templates
指導教授:袁維勵
指導教授(外文):Wei-Li Yuan
學位類別:碩士
校院名稱:逢甲大學
系所名稱:化學工程學所
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:2007
畢業學年度:95
語文別:英文
論文頁數:73
中文關鍵詞:中空粒子二氧化矽生物模板奈米油滴
外文關鍵詞:Hollow particlesNanoSilicaOil- and Bio-Templates
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本文中主要以油滴及生物模板製備二氧化矽中空微/奈米粒子。第一部份以桿菌及其孢子為模板,經由sol-gel方法來製備中空粒子。第二部份是以油滴為模板,以單一簡捷的步驟經乳化的方式來製備奈米中空粒子。
The colloidal spheres may take the form of a solid, a core-shell, or a hollow structure, and the chemical compositions could be either metallic like Au, Ag, Ni, Se, Bi, Pb, Pt; inorganic like CdSe, SiO2 or TiO2; or organic such as polystyrene (PS) or poly(methyl methacrylate) (PMMA). In the past decade, there have been immense efforts to fabricate hollow colloidal particles with tailored structural, optical and surface properties. Hollow particles often exhibit improved physical and chemical properties, and hence are potentially useful in a broader range of applications.
In this thesis, monodisperse, micro/nano-meter sized hollow particles prepared by the sol-gel method using oil- and bio-templates are reported. In experimental part A, we prepared silica hollow capsules using rod-like clostridium and its spherical spores as template. These two shapes of silica shell were formed via the sol-gel method. In experimental part B, we report the syntheses of hollow silica particles based on a convenient one-step process in a mini/micro-emulsion using an oil template. An ultrasonicator was utilized to create a surfactant stabilized mini-emulsion of very small droplets. It was found possible to make silica particles having voids with facile control of particle diameter by changing the working temperatures.
At surfactant concentrations below the 25˚C critical micelle concentration (CMC) of cetyl trimethyl ammonium bromide (CTAB), morphologies of the silica particles are flaky, broken, or anomalous. At 4 CMC of CTAB and 30˚C, hollow silica nanoparticles could be obtained with a diameter of 20 nm. Hollow spheres of a few hundred nanometers in size were also obtained by vaporization and expansion of the oil template at elevated temperatures. Monodispersed hollow silica nanoparticles of 500 nm in diameter were obtained at 60˚C. Finally, hollow PMMA spheres of about 500 nm in size were obtained using similar procedures and reported.
Abstract i
Table of Contents iii
List of Figures v
Chapter 1 Introduction 1
Chapter 2 Literature Review 2
2.1 Hollow Particles 3
2.1.1 Hard Template-Based Syntheses 4
2.1.2 Soft Template-Based Syntheses 8
2.2 Emulsion Polymerization 14
2.2.1 Ostwald Ripening 15
2.2.2 Mini-emulsions 17
Chapter3 Experimental 19
3.1 Materials 19
3.2 Equipment 19
3.2.1 Specimen Preparation for SEM and TEM 20
3.2.2 Dynamic Light Scattering (DLS) Measurement 20
3.3 Background 21
3.3.1 Characteristics of Biotemplates 21
3.3.2 Preparation of Monodisperse Silica Sphere 23
3.3.3 Critical Micelle Concentration (CMC) 24
3.3.4 Cenospheres 27
3.4 Experimental Procedures 29
3.4.1 Part A: Formation of Silica Hollow Capsules on Bio-templates 29
3.4.2 Part B: Preparation of hollow silica nanoparticles in mini/micro-emulsions 30
Chapter 4 Results & Discussions 35
4.1 Results (Part A) 35
4.2 Results (Part B) 38
Chapter 5 Conclusions 67
Reference 69
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