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Prepartion and Applicatons of Novel Flurescent Mesoporous Nanoparticles

Author: LiHui
Tutor: LvChangLi
School: Northeast Normal University
Course: Polymer Chemistry and Physics
Keywords: Mesoporous silica nanoparticles 8-Hydroxyquinolinate zinc complexes PPV Tris(2,2’-bipyridyl)ruthenium(Ⅱ) chloride hexahydrate Rhodamine 6G Optical properties
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 106
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Abstract


Functionalized mesoporous silica materials have received much attention because of their potential applications in areas such as drug-delivery systems, optical and dye-doped energy-transfer schemes. Fluorescent mesoporous silica nanoparticles have received considerable attention, since the materials hold great promise for biomedical applications such as drug delivery carriers, diagnostic analysis and ?uorescent labeling. Different emission centers, including dye molecules, conjugated polymers, rare earth complexes, 8-hydroxyquinoline grafting metal complexes and CdSe/ZnS quantum dots (QDs) have already been introduced into the mesoporous silica to prepare high fluorescence mesoporous materials.In this study, we choose the mesoporous silica as host material, incorporated 8-hydroxyquinolinate zinc complexes (Znqx) and poly(p-phenylenevinylene) (PPV) into the channels of mesoporous silica nanoparticles by in situ formation and in situ polymerization method. Tris(2,2’-bipyridyl)ruthenium(II) chloride hexahydrate and Rhodamine 6G have also been successfully introduced into the mesoporous silica by direct chemical adsorption. Thus, through this way, we prepared different fluorescence mesoporous silica nanoparticles (MSNs) with stable emission. At the same time, the structures and photophysical properties of the different fluorescent MSNs were studied in detail. The results show that: (1) the 8-hydroxyquinolinate zinc complexes (Znqx) in situ synthesized in the channels of MSNs with different inner surroundings were determined as a single coordination mode (Znq). The MSNs-Znq obtained by in situ generation procedure possess highly ?uorescence emission, outstanding optical stability at different pH values as compared with that obtained by direct chemical adsorption of Znq2. The obtained ?uorescent MSNs were used in the controlled release of ibuprofen. (2) The fluorescence properties of PPV@MSNs composite materials depend on the concentration of PPV in MSNs and the size of mesoporous silica particles. The different fluorescent mesoporous silica nanoparticles can be dispersed in water, which makes them have the potential applications in biomedical fields such as drug delivery, biological markers and gene carriers.

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