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Synthesis of Magnetic Nanoparticles in Reverse Microemulsion and the Study on the Conjugation Mechanism between CdTe Quantum Dots and Metal Ions by Capillary Zone Electrophoresis

Author: HaoJunJie
Tutor: ChenHongLi
School: Lanzhou University
Course: Analytical Chemistry
Keywords: Fe3O4 nano-materials CdTe quantum dots Capillary Electrophoresis Metal ion Mechanism
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 104
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Abstract


In recent years, nanomaterials synthesis, characterization and application in the biomedical field has attracted more and more attention. The establishment and improvement of synthetic methods to prepare uniform morphology, good dispersion, stable, biocompatible good nanomaterials is one of the Nanoscale Science important research direction. The unique optical properties of semiconductor nano-materials having the width of the excitation band of the narrow emission bands, the emission wavelength can be precisely regulated, resistance to photobleaching phenomenon has become scientific hotspot. CdTe quantum dots (CdTe quantum dots) is one of the studied material, has been used for the analysis and detection of metal ions and small organic molecules, life sciences and other areas, however, the fluorescence quenching mechanism, in particular metal ions and quantum dots the study of the mechanism of action is still limited to a mixed system, thereby establishing a separation system between the mechanism of action has great significance. Based on this, the thesis on the basis of previous work, focusing on establishing a new method of preparation of magnetic materials and the use of capillary zone electrophoresis of metal ions and quantum dots mechanism of action of a more in-depth study is divided into the following four chapters: Chapter: An Introduction to the preparation of magnetic nanomaterials, the characteristics of CdTe QDs, Synthesis and application, and a brief introduction of capillary electrophoresis in the quantum dot system. Chapter II: the establishment of a new method of magnetic Fe304 nanoparticles prepared in reversed microemulsion at room temperature for the first time in reversed microemulsion synthesized superparamagnetic nature polyhedral structure of iron oxide nanoparticles. Chapter 3: using fluorescence The ultraviolet optical data to study the interaction between CdTe QDs with Hg2, observed the impact of temperature on the quenching; using capillary electrophoresis technology for the first time-depth study of the mechanism of CdTe QDs with Hg2 found Hg2 quenching phenomenon of quantum dots competitive nature of the metal ions and ligands combined. Chapter 4: using capillary electrophoresis technology the CdTe QDs Cu2, Pb2 mechanism found of Pb2 with the Hg2 the CdTe QDs fluorescence quenching mechanism similar. While the great impact of free Cu2 CdTe QDs mechanism modifier TGA. When the solution in the presence of free TGA, Cu2 first caused the fluorescence quenching of CdTe QDs, and with time, fluorescence gradually restored, mechanism of action should be Cu2 binding to the surface of CdTe QDs, and then reduced to Cu, and in The CdTe QDs formed on the surface of the the Cu2S composite; when the solution does not exist in a free TGA, Cu2 induced fluorescence quenching of the CdTe QDs, the mechanism of action for competitive binding between the metal ion and the ligand.

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