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Title: Nanostructured aluminium titanate (Al{sub 2}TiO{sub 5}) particles and nanofibers: Synthesis and mechanism of microstructural evolution

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 Al{sup 3} {sup +} and Ti{sup 4} {sup +} 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 nucleationmore » and growth regime. - Graphical abstract: Display Omitted - Highlights: • We synthesized aluminium titanate ceramic in both powder and nanofiber forms. • The methods in use were citrate sol gel and sol gel-assisted electrospinning. • Powders and nanofibers bear a nanostructured nature with a grain size less than 70 nm. • A model is suggested to describe microstructural evolution of synthetic products.« less

Authors:
 [1];  [1];  [1];  [2]
  1. Department of Materials Science and Engineering, Sharif University of Technology, P.O. Box 11155-9466, Azadi Avenue, Tehran (Iran, Islamic Republic of)
  2. Department of Materials Science and Engineering, Sharif University of Technology, P.O. Box 11365-9466, Azadi Avenue, Tehran (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
22476090
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 103; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1044-5803
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ALUMINIUM COMPOUNDS; ALUMINIUM OXIDES; CERAMICS; CHELATING AGENTS; CRYSTALLIZATION; DIFFERENTIAL THERMAL ANALYSIS; GRAIN SIZE; NANOFIBERS; NUCLEATION; POWDERS; SCANNING ELECTRON MICROSCOPY; SOL-GEL PROCESS; SYNTHESIS; TITANATES; X-RAY DIFFRACTION

Citation Formats

Azarniya, Abolfazl, E-mail: abolfazl_azarniya@mehr.sharif.ir, Azarniya, Amir, E-mail: a.azarnia91@gmail.com, Hosseini, Hamid Reza Madaah, E-mail: madaah@sharif.ir, and Simchi, Abdolreza. Nanostructured aluminium titanate (Al{sub 2}TiO{sub 5}) particles and nanofibers: Synthesis and mechanism of microstructural evolution. United States: N. p., 2015. Web. doi:10.1016/J.MATCHAR.2015.03.030.
Azarniya, Abolfazl, E-mail: abolfazl_azarniya@mehr.sharif.ir, Azarniya, Amir, E-mail: a.azarnia91@gmail.com, Hosseini, Hamid Reza Madaah, E-mail: madaah@sharif.ir, & Simchi, Abdolreza. Nanostructured aluminium titanate (Al{sub 2}TiO{sub 5}) particles and nanofibers: Synthesis and mechanism of microstructural evolution. United States. doi:10.1016/J.MATCHAR.2015.03.030.
Azarniya, Abolfazl, E-mail: abolfazl_azarniya@mehr.sharif.ir, Azarniya, Amir, E-mail: a.azarnia91@gmail.com, Hosseini, Hamid Reza Madaah, E-mail: madaah@sharif.ir, and Simchi, Abdolreza. Fri . "Nanostructured aluminium titanate (Al{sub 2}TiO{sub 5}) particles and nanofibers: Synthesis and mechanism of microstructural evolution". United States. doi:10.1016/J.MATCHAR.2015.03.030.
@article{osti_22476090,
title = {Nanostructured aluminium titanate (Al{sub 2}TiO{sub 5}) particles and nanofibers: Synthesis and mechanism of microstructural evolution},
author = {Azarniya, Abolfazl, E-mail: abolfazl_azarniya@mehr.sharif.ir and Azarniya, Amir, E-mail: a.azarnia91@gmail.com and Hosseini, Hamid Reza Madaah, E-mail: madaah@sharif.ir and Simchi, Abdolreza},
abstractNote = {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 Al{sup 3} {sup +} and Ti{sup 4} {sup +} 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. - Graphical abstract: Display Omitted - Highlights: • We synthesized aluminium titanate ceramic in both powder and nanofiber forms. • The methods in use were citrate sol gel and sol gel-assisted electrospinning. • Powders and nanofibers bear a nanostructured nature with a grain size less than 70 nm. • A model is suggested to describe microstructural evolution of synthetic products.},
doi = {10.1016/J.MATCHAR.2015.03.030},
journal = {Materials Characterization},
issn = {1044-5803},
number = ,
volume = 103,
place = {United States},
year = {2015},
month = {5}
}