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Title: Molten Salt Hydrates in the Synthesis of TiO 2 Flakes

Abstract

Herein, we present a method for the preparation of titanium dioxide with a relatively large surface area, mesoporosity, and good thermal stability. We show that by utilizing molten salt hydrates (MSH) as non-trivial synthesis media, we prepare materials with thin, flake-like morphology with a large aspect ratio. The thickness of the synthesized flakes can be controlled by adjusting the salt/water (always in the MSH regime) and/or the salt/precursor molar ratio. The TiO 2 flakes appear to be formed via the aggregation of small TiO 2 nanoparticles (typically around 7–8 nm) in an apparent 2D morphology. We hypothesize that the ordered structure of water molecules within the ions of the salt in conjunction with the fast hydrolysis/condensation rates occurring in the presence of water of the precursor used are responsible for this agglomeration. We also report that the purity of materials (anatase vs brookite crystalline phase) appears to be a function of the LiBr/water ratio which is hypothesized to arise either from pH variation or due to lattice matching of the relevant orthorhombic structures (brookite and LiBr x·3H 2O). Discussion on the potential for scalability of the presented method is also highlighted in this article.

Authors:
 [1];  [2]; ORCiD logo [1]
  1. Rutgers Univ., Piscataway, NJ (United States)
  2. Univ. of Delaware, Newark, DE (United States)
Publication Date:
Research Org.:
Rutgers Univ., Piscataway, NJ (United States); Univ. of Delaware, Newark, DE (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
OSTI Identifier:
1576874
Alternate Identifier(s):
OSTI ID: 1579903
Grant/Contract Number:  
SC0001004
Resource Type:
Published Article
Journal Name:
ACS Omega
Additional Journal Information:
Journal Volume: 4; Journal Issue: 25; Journal ID: ISSN 2470-1343
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Tran, Trang Q., Zheng, Weiqing, and Tsilomelekis, George. Molten Salt Hydrates in the Synthesis of TiO2 Flakes. United States: N. p., 2019. Web. doi:10.1021/acsomega.9b02850.
Tran, Trang Q., Zheng, Weiqing, & Tsilomelekis, George. Molten Salt Hydrates in the Synthesis of TiO2 Flakes. United States. doi:10.1021/acsomega.9b02850.
Tran, Trang Q., Zheng, Weiqing, and Tsilomelekis, George. Tue . "Molten Salt Hydrates in the Synthesis of TiO2 Flakes". United States. doi:10.1021/acsomega.9b02850.
@article{osti_1576874,
title = {Molten Salt Hydrates in the Synthesis of TiO2 Flakes},
author = {Tran, Trang Q. and Zheng, Weiqing and Tsilomelekis, George},
abstractNote = {Herein, we present a method for the preparation of titanium dioxide with a relatively large surface area, mesoporosity, and good thermal stability. We show that by utilizing molten salt hydrates (MSH) as non-trivial synthesis media, we prepare materials with thin, flake-like morphology with a large aspect ratio. The thickness of the synthesized flakes can be controlled by adjusting the salt/water (always in the MSH regime) and/or the salt/precursor molar ratio. The TiO2 flakes appear to be formed via the aggregation of small TiO2 nanoparticles (typically around 7–8 nm) in an apparent 2D morphology. We hypothesize that the ordered structure of water molecules within the ions of the salt in conjunction with the fast hydrolysis/condensation rates occurring in the presence of water of the precursor used are responsible for this agglomeration. We also report that the purity of materials (anatase vs brookite crystalline phase) appears to be a function of the LiBr/water ratio which is hypothesized to arise either from pH variation or due to lattice matching of the relevant orthorhombic structures (brookite and LiBrx·3H2O). Discussion on the potential for scalability of the presented method is also highlighted in this article.},
doi = {10.1021/acsomega.9b02850},
journal = {ACS Omega},
number = 25,
volume = 4,
place = {United States},
year = {2019},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1021/acsomega.9b02850

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