Controlled Nano and Submicro Fabrication of Surface for PBG crystals, Chemosensor, and Chelate Polymer
- 발행기관 고려대학교 대학원
- 발행년도 2004
- 학위명 박사
- 학과 대학원:화공생명공학과
- 식별자(기타) DL:000014914284
- 서지제어번호 000045216074
초록/요약
Stable dispersions of monodisperse colloidal PS spheres with submicron-size have been synthesized according to a general emulsion polymerization for PBG crystals. The size of the PS spheres can be controlled by surfactant and monomer. The periodically ordered three-dimensional porous structure with submicron PS spheres was carried by a precisely controlled withdrawing method in which the fabrication of the template and the infiltration of the voids of the template are delivered while confirming the related experimental parameters for the assembly, including temperature, concentrations, and withdrawing speed. Scanning electron microscope(SEM) images and UV-vis transmission spectra of the samples show that these films have a highly ordered three-dimensional structure. The transmission spectra of the films with changing incident angle favorably coincided with calculated results from Bragg and Snell’s law. A unique chemosensor for Ag ions was carried out by coupling an anthracene signaling unit onto the amine terminated glass slide. Because the coupling reaction is dependent on the amount of the exposed amine groups, chemical dye(orange II) was applied to establish the exposed amine groups on the surface. The assembled layer had not a flat but emboss-like shape on micro-basis and the higher surface roughness than original glass due to the morphology of rare glass. Despite ppb concentration, the quenching effect of the synthesized chemosensor came out in only Ag aqueous solution. When several Ag ions were provided for the chemosensor, the morphology of the chemosensor was considerably changed, which made a change of contact angles. All the states of the chemosensor in the surface were characterized through atomic force microscopy(AFM) and scanning electron microscopy(SEM). The bowing effect and binding state concerning adsorption of Ag ions were further specified using X-ray photoelectron spectroscopy(XPS). A Polyacrylonitrile (PAN) fiber was adopted for the back-bone o
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Abstract i
List of Figures ix
List of Schemes and Table xv
Chapter 1 Fabrication of 3-dimensional opal :
Study on the photonic band gap(PBG) crystal using monodisperse polystyrene
1.1 Introduction 2
1.1.1 Basics of the PBG crystals 5
1.1.2. Bragg diffraction and opal 7
1.1.3 Fabrication of PBG crystals 9
1.1.4 Control of light in the PBG crystals and those simulation 13
1.2 Experimental 16
1.2.1 Colloidal synthesis 16
1.2.2 Substrate and Treatment 17
1.2.3 Fabrication of 3-D PBG crystal film and characterization 17
1.2.4 Fabrication of thick PBG crystals through physical confinement 19
1.2.5 Fabrication of inverse opal 21
1.3 Results and discussion 23
1.3.1 The size of synthesized PS sphere 23
1.3.2 Temperature effect 25
1.3.3 Control of film thickness 28
1.3.4 Observation of arrayed structure 32
1.3.5 Optical Properties 35
1.3.6 Inverse opal 40
1.4 summary 42
1.5 References 43
Chapter 2 chemosensor :
Bowing effect with fluorescence : a unique chemosensor for silver ion
2.1 Introduction 48
2.2 Principles 49
2.2.1 Supramolecular host-guest compounds and those coordination 49
2.2.2 Fluorescent photoinduced electron transfer(PET) cation sensors 53
2.2.3 Fluorescent photoinduced charge transfer(PCT) cation sensors 56
2.2.4 Formation and structure of self-assembled monolayer 59
2.3 Experimental 62
2.3.1 General information 62
2.3.2 Materials 62
2.3.3 Preparation of amine terminated glass substrate 62
2.3.4 Formation and deformation of orange II salt 63
2.3.5 Coupling active units onto amine terminated glass 63
2.3.6 Quenching effect 64
2.4 Results and discussion 64
2.4.1 Surface density of amine 64
2.4.2 Formation of the chemosensor 69
2.4.3 X-ray photonelectron spectroscopy(XPS) analysis 71
2.4.4 Scanning electron microscopy(SEM) images 77
2.4.5 Quenching effect of several metal ions 79
2.5 Conclusions 81
2.6 References 82
Chapter 3 chelate polymer :
Design of high efficiency chelate fibers with amine g
