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Study on Nucleation and Growth of Titanium Dioxide Nano Particles via Gel-Sol Method

Shahini, Sharif | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40333 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Askari, Masoud
  7. Abstract:
  8. Nanotechnology is an efficient method suitable for fabrication and production of minimal single dimensional nanometric structures. Such materials and systems can be logically designed that lead to new and optimized biological, chemical and physical properties and characteristics due to their size. Nucleation and growth –appearance of a new phase out of an old phase – is a ubiquitous phenomenon in nature. Fundamental understanding of nanoparticles nucleation and growth mechanism allows more control on form, size and composition and allows tuning of the above said properties easily with use of different reactive conditions as a result of this ability . Nanoparticles of titania are one of the important materials which are widely considered in nanotechnologies today due to its excellent optical, dielectric and catalytic properties and the attempt is made to prepare them for use in different technologies by creating desirable properties in particles of this composite through control of size and morphology of particles, structure and chemical compound and active surface of the particles. In this research which studied nucleation and growth processes and their effective factors, Gel-sol method which is a new method for production of nanoparticles was used for production of nanoparticles of titanium oxide and properties of the produced nanoparticles were analyzed with XRD, BET and TEM. This method at relatively low temperatures i.e. less than 160 C produced disperse uniform nanoparticles with 100% crystal surface anatase structure and crystallite size less than 6 nm and special surface area more than 221 sq meters/g and average size of particles less than 7 nm and it was made clear that temperature and heat treatment time had no effect on crystallite structure of the produced nanoparticles, while they had strong effect on size of the particles
  9. Keywords:
  10. Nanoparticles ; Nucleation ; Growth ; Titanium Oxide ; Jel-Sol Method

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