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Nanostructured aluminium titanate (Al2TiO5) particles and nanofibers: Synthesis and mechanism of microstructural evolution

Azarniya, A ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1016/j.matchar.2015.03.030
  3. Publisher: Elsevier Inc , 2015
  4. Abstract:
  5. Abstract In this study, aluminium titanate (AT) particles and nanofibers were synthesized through citrate sol gel and sol gel-assisted electrospinning methods in both nanostructured powder and nanofiber forms. The results of X-ray diffraction analysis, field-emission scanning electron microscopy and differential thermal analysis showed that the synthetic products benefit a nanostructured nature with a grain size less than 70 nm. The optimal values for time and temperature at which a roughly pure AT is attained were determined as 2 h and 900 C, respectively. It was found that the sol gel precursor bears an amorphous structure till 700 C and begins to be crystallized to alumina, anatase and AT at higher temperatures. Moreover, AT tends to decompose into rutile and alumina at temperatures higher than 900 C and its degradation rate reaches a maximum at temperatures near to 1100 C. In this synthesis, citric acid was used as a chelating agent for Al3 + and Ti4 + ions and it was shown that a low citric acid-to-metal cation ratio leads to larger numbers of nuclei during crystallization and smaller grain size. Finally, a model was suggested to describe the microstructural evolution of AT compound based on a nucleation and growth regime
  6. Keywords:
  7. Nanofiber ; Sol gel ; Alumina ; Chelation ; Chemical industry ; Citric acid ; Degradation ; Differential thermal analysis ; Electrospinning ; Field emission microscopes ; Grain size and shape ; Microstructural evolution ; Nanofibers ; Nanostructured materials ; Oxide minerals ; Scanning electron microscopy ; Sol-gel process ; Spinning (fibers) ; Thermoanalysis ; Titanium compounds ; X ray diffraction analysis ; Aluminium titanate ; Amorphous structures ; Electrospinning method ; Field emission scanning electron microscopy ; Nanostructured powders ; Nucleation and growth ; Sol-gel precursors ; Synthetic products ; Aluminum
  8. Source: Materials Characterization ; Volume 103 , 2015 , Pages 125-132 ; 10445803 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S104458031500090X