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Colloidal stability of dextran and dextran/poly ethylene glycol coated TiO2 nanoparticles by hydrothermal assisted sol-gel method

Naghibi, S ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ceramint.2013.04.018
  3. Publisher: 2013
  4. Abstract:
  5. Colloidal stability of dextran (Dex) and Dex/poly ethylene glycol (PEG) coated TiO2 nanoparticles (NPs) were investigated. The particles were successfully synthesized by a hydrothermal assisted sol-gel technique. The results of Ultraviolet-visible (UV-vis) spectrophotometry showed that Dex and PEG additions during hydrothermal process (HTP) led to the formation of long-term (more than 60 days) stable colloids, while the addition of dispersants after HTP did not have a significant impact on the colloidal stability of NPs. X-ray diffraction (XRD) and selected area electron diffraction (SAED) analyses proved that PEG and/or Dex coated NPs had less crystallinity than the plain TiO2. Fourier transform infrared (FTIR) spectroscopy demonstrated the formation of primary bonds between NPs and polymeric dispersants. High-resolution transmission electron microscopy (HRTEM) displayed stable particles with a core-shell structure resulting from coating of NPs by polymeric materials. Thermo gravimetric analysis (TGA) was also utilized to calculate the proportion of NPs to polymeric dispersant
  6. Keywords:
  7. Colloidal stability ; Dextran ; Hydrothermal assisted sol-gel ; PEG ; TiO2 nanoparticle ; Core shell structure ; Hydrothermal process ; Hydrothermal-assisted ; Polymeric dispersant ; Polymeric dispersants ; Selected area electron diffraction ; TiO ; Electron diffraction ; Ethylene glycol ; Fourier transform infrared spectroscopy ; Nanoparticles ; Polyethylene glycols ; Polymers ; Polyols ; Sol-gel process ; Sol-gels ; Stability ; Thermogravimetric analysis ; Transmission electron microscopy ; X ray diffraction ; Titanium dioxide
  8. Source: Ceramics International ; Volume 39, Issue 7 , 2013 , Pages 8377-8384 ; 02728842 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0272884213004082