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研究生：	卓佳妤 Cho, Chia-Yu
論文名稱：	交流磁場對磁性與螢光雙功能雙邊不對稱球體之操控研究 AC Magnetic Field Manipulation to Magnetic-Fluorescent Bifunctional Janus Particles
指導教授：	郭昌恕 Kuo, Chang-Shu
學位類別：	碩士 Master
系所名稱：	工學院 - 材料科學及工程學系 Department of Materials Science and Engineering
論文出版年：	2020
畢業學年度：	108
語文別：	英文
論文頁數：	133
中文關鍵詞：	磁性雙邊不對稱球體、交流磁場、螢光、旋轉頻率、磁敏感度
外文關鍵詞：	magnetic Janus particles, alternating current magnetic field, fluorescence, rotational frequency, magnetic sensitivity
相關次數：	點閱：104 下載：0
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以直徑為480奈米且具有多孔表面的二氧化矽顆粒作為製造雙邊不對稱球體的核心材料。利用螢光染料使雙邊不對稱球體的一個半球具有螢光特性，另一個半球則以磁性奈米顆粒在孔洞中進行改質。利用雙邊不對稱球體的磁性/螢光異向性，在交流磁場下操控雙邊不對稱球體的旋轉運動並根據周期性螢光進行光學監測。此研究結合交流電函數產生器、示波器、光源以及光感測器作為實驗室自製的系統，以分析來自可調變交流磁場產生之雙邊不對稱球體的旋轉運動和光信號。同時，也利用快速傅立葉轉換的方法來呈現響應的旋轉頻率和頻率相位差。
此系統引入雙軸磁場作為驅動雙邊不對稱球體旋轉的兩種刺激源。交流磁場為雙邊不對稱球體旋轉提供旋轉力，而靜磁場則提供雙邊不對稱球體的磁化方向，作為在交流磁場較弱時球體旋轉的回復力。為了全面討論480奈米雙邊不對稱球體在交流磁場操控下的旋轉運動，必須考慮溶液介質的影響、球體旋轉的驅動力以及球體之間的距離等因素。最終目標是研究在此系統中旋轉的雙邊不對稱球體的敏感度和外部交流磁場及靜磁場的函數關係，以及旋轉的雙邊不對稱球體是否具有特定的旋轉共振頻率。

Silica particles with 480nm in diameters and porous surface were used as the core materials for the fabrication of Janus particles containing one hemisphere functionalized with fluorescent dyes and another hemisphere modified with magnetic nanoparticles in the pores. The anisotropic property of magnetic/fluorescent Janus particles was utilized to manipulate the rotational motion of Janus particles under the alternating current (AC) magnetic field and the optical monitoring from periodical fluorescence emission. This research work combined an AC function generator, an oscilloscope, a light source and a photodetector as a lab-made system to analyze the rotations of the Janus particles from the tunable AC magnetic field and the optical signals. Meanwhile, the fast Fourier transform was also utilized to reveal the responded rotation frequency and the frequency phase.
This system introduced a biaxial magnetic field as two magnetic stimulations for driving Janus particles rotation motions. Alternating current (AC) magnetic field provided the rotating force for particles rotation, and static magnetic field (SMF) provided the magnetization direction of the particles, which acted as the returning force to the particle rotation during the weak AC magnetic field. For the purpose of comprehensively discussing the rotation motion of 480nm Janus particles under AC magnetic field manipulation, including the influence of the solution mediums, the driving force to the particle rotations, and the distance between the particles must be considered. The ultimate goal is to study the sensitivity of the rotating Janus particles in this system as functions of the applied external AC and SMF magnetic fields and whether the rotating Janus particles have a specific rotational resonance frequency.

中文摘要 II
Abstract  III
致謝 V
Table of Contents  VI
List of Tables  X
List of Illustrations XII
Chapter 1 Introduction  1
1 Janus Particles and Asymmetric micro- and nano-Materials  1
1.1 Janus-like Materials  3
1.2 Fabrication of Janus Particles  4
One-dimensional Electrospun Fibers as Particles Embedding Substrates  16
1.3 Applications 18
2 Alternating Magnetic Field  23
2.1 Electromagnet (Magnetic Coil) 23
2.2 AC Magnetic Field Impedance  25
2.3 Applications of Alternating Current Magnetic Field 25
3 Manipulation of Janus Particles by External Magnetic Field 27
3.1 Magnetic Field Induced Self-Assembly 27
3.2 Particles Orientation in a Suspended Medium 29
3.3 Anisotropic Optical Properties 32
3.4 Applications of Magnetically-driven Janus Particles 35
4 Magnetic-sensing and Magnetoreception  38
5 Theoretical Basis 39
5.1 Anisotropic Fluorescence Emission for Tracking Particle Rotation 39
5.2 The Concept of Theoretical Brownian Rotation Frequency  39
5.3 The Reference of Experimental Setup 40
Chapter 2 Motivation 41
Chapter 3 Experimental 43
1 Chemicals  43
2 Instruments  45
3 Magnetic-Fluorescence Surface Porous Janus Particles Preparation 47
3.1 Preclean of 480nm Silica Particles  47
3.2 Fabrication of Surface Porous Silica Particles 47
3.3 Amino Sol-gel Reaction 47
3.4 Fabrication of Fluorescence Surface Porous Silica Particles 48
3.5 Electrospinning of PMMA/P4VP Blend Fibers 49
3.6 Fluorescence Surface Porous Silica Particles Adsorption 49
3.7 Isothermal Heat Treatment for Particles Embedding 50
3.8 The process of TEOS protection layer 50
3.9 The Process of Wax Protection layer 51
3.10 PMMA/P4VP Fibers Dissolving Process  51
3.11 Fabrication of Magnetic Surface Porous Silica Particles 51
3.12 Dewaxing Process 52
4 Analytical Instrument  53
4.1 Dynamic Light Scattering (DLS) 53
4.2 Zeta-Potential Measurement  53
4.3 Optical Microscope (OM) 54
4.4 Scanning Electron Microscopy (SEM)  55
4.5 UV-visible Spectrometer  55
4.6 Photoluminescence Spectroscopy (PL). 56
doi:10.6844/NCKU202003021
4.7 Photoluminescence Optical System 57
4.8 Photodetector 58
5 Biaxial Magnetic Field Manipulation  59
5.1 Erection of The Entire System 59
5.2 The Adjustment Method of SMF and AC Magnetic Field Strength 61
5.3 Signal Processing Method  67
Chapter 4 Result and Discussion  68
1 Synthesis of Surface Porous Silica Particles  68
1.1 Surface-Protected Etching Process  68
1.2 Influence of Reaction Time on Etching Process 69
2 Fabrication of Bifunctional Magnetic-Fluorescence Janus Particles  72
2.1 Surface Porous Silica Particle Modified with Atlantic Blue Dye  72
2.2 IEP Measurement of Full AB Surface Porous Silica Particles  73
2.3 Full AB Surface Porous Silica Particles Adsorption  74
2.4 TEOS and Wax Protection Layer via CVD Process  78
2.5 Magnetic Nanoparticles Filling in Process (Fe3O4 Synthesis)  80
2.6 Dye Functionalization and Optical Properties  82
3 Dynamic Motions in Magnetic Field 84
3.1 Magnetic Janus Particles Alignment 84
3.2 Magnetic Janus Particles Rotation Behavior 88
4 Analysis of Magnetic-Fluorescence Janus Particles Rotation Motion under Biaxial Magnetic Field  98
4.1 The Response to Biaxial Magnetic Field  98
4.2 Factors Affect Particles Rotation Behavior 103
4.3 Sensitivity of Magnetic Janus Particles to External Magnetic Field  120
4.4 Applications 126
Chapter 5 Conclusions  127
Chapter 6 Reference  128
                                    

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