Dissertation > Excellent graduate degree dissertation topics show

Preparation of Different Morphological Silica Nanoparticles Via Polymer Template

Author: ChenYuChen
Tutor: WangZuoZhen；GeXueWu
School: University of Science and Technology of China
Course: Polymer Chemistry and Physics
Keywords: silica nanoparticles PNIPAM P(St-co-AA) hollow spheres raspberry-like spheres
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 127
Quote: 0
Read: Download Dissertation

Abstract


In recent years, the strategies to fabricate inorganic/organic composite microspheres have attract great interests of material scientists, principally because such particles can display novel and enhanced properties (e.g. mechanical, chemical, electrical, rheological, magnetic and optical) by independently altering the composition, dimension and structure. In this study, SiO2/polymer nanocomposite spheres with raspberry-like were obtained via sol-gel method. Also monodisperse hollow silica spheres based on the PNIPAM/SiO2 nanocomposite spheres were prepared via a one-step method. The main contents of the work are as follows:1. Hollow silica nanospheres with mesoporous shells were successfully fabricated with a new one-pot strategy by using a thermosensitive polymer, poly(N-isopropylacrylamide) (PNIPAM), as soft template. By simply regulating the solution temperature with respect to the lower critical solution temperature (LCST) of PNIPAM, PNIPAM chains can reversibly form aggregates in aqueous solution. Through adding TEOS and modifying the pH value, the microspheres with PNIPAM as core and the silica as shell are obtained. Then, the temperature of aqueous solution is decreased to dissolve the PNIPAM. Finally, the hollow silica microspheres with the diameter of 150 nm are fabricated.2. Monodisperse raspberry-like silica/polystyrene composite nanoparticles were readily prepared by a single-step sol-gel method. First, we introduce–COOH on the surface of micropheres via the copolymerization of St and AA. Silica nanoparticles from TEOS are adhered onto the modified surface of micropheres. Finally, we centrifugate the solution and dry the sample to obtain SiO2/ PS composite microspheres with raspberry-like structure. The fabricated composite particles have a well-defined structure. The diameter of silica nanoparticles and their coverage degree on the surface of PS spheres could be easily tailored by adjusting the tetraethoxysilane concentration.

Related Dissertations

  1. Hydrothermal Synthesis of Oxide Hollow Spheres,TB383.4
  2. Design, Preparation and Perfermance Study of Controlled Release Systems Based on Mesoporous Silica Nanoparticles(MSNs) and one Sensor for Lithium Ions,TP212
  3. Novel core-shell structure of intelligent nano Synthesis and Characterization of Hydrogels,TB383.1
  4. Preparation of hollow spheres of titanium dioxide and biological activity,TB43
  5. Drug Delivery Research of Polymer and Silica Nanoparticles,TB383.1
  6. Different morphologies SiO_2 Nanomaterials and fluorescent particles are used for the detection of E. coli,TB383.1
  7. Study on the in Vivo Bioeffects of Silica Nanoparitcles with Different Sizes,TB383.1
  8. Synthesis and Characterization of Organic/Inorganic Composites Based on Polyaniline,TB383.1
  9. The Effect of Nano-silica Particles Interposed in the Enzyme Activity, Casein Phosphopeptides Preparation and Bioactivity Protection,TQ127.2
  10. Study on Novel DNA Electrochemiluminescence Biosensors,TP212.3
  11. Preparation and Properties of Epoxy/SiO2 Hollow Spheres Nanocomposites,TB383.1
  12. Flame Synthesis Silica Nanoparticles,TB383.1
  13. Surfactant system , cobalt, nickel magnetic micro and nano Preparation and Properties of Materials,TB383.1
  14. Synthesis of Indium Oxide Nanomaterials and Application for Gas Sensing,TB383.1
  15. Mesoporous materials mesoscopic structure and morphology control,TB383.4
  16. Fabrication of TiO2 Hollow Spheres and Its Applications in Dye Sensitized Solar Cell,TM914.4
  17. Preparation of Organic-Inorganic Hybrid Nanocomposite Hollow Spheres and Their Properties,TB383.1
  18. Silica-based anticancer nanoparticles Carriers,TB383.1
  19. Based nanomaterials tumors in vivo fluorescence imaging and photodynamic therapy,TB383.1
  20. Dielectrophoretic Assembly of Functionalized Silica Nanoparticles and Its Effects on Dielectric Properties of Cells,TB383.1
  21. Study on Preparation and Properties of TiO2 Nanotubes and Hollow Spheres,TB383.1

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net  Mobile