Effects of Preparation Parameters on the Characteristics of SiO2- and CoxOy-Modified-TiO2 Colloids Prepared by Hydrolysis of Titanium Alkoxide Full article
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Journal of Sol-Gel Science and Technology
ISSN: 0928-0707 , E-ISSN: 1573-4846 |
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| Output data | Year: 2020, Volume: 94, Number: 3, Pages: 607-615 Pages count : 9 DOI: 10.1007/s10971-019-05139-4 | ||||||
| Tags | 29Si NMR; Aging time; Hydrolysis; Sol–gel method; Titanium tetra-n-butoxide; Viscosity | ||||||
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Funding (1)
| 1 | The Ministry of Education and Science of the Russian Federation | 10.2281.2017/ПЧ |
Abstract:
A series of SiO2-, and CoxOy-modified-TiO2 colloids prepared by hydrolysis of titanium alkoxide were synthesized. The effects of concentrations of water, acid, cobalt chloride, and tetraethoxysilane on the characteristics of colloids were investigated. The rheologic characteristics of the sols were characterized by liquid state 29Si nuclear magnetic resonance (NMR), Raman spectroscopy, and photon correlation spectroscopy. It was found that an increase in the acid concentration from 1 to 60 mM resulted in a decrease of the particle size from 17 to 9 nm, while the diffusion coefficient increased with twofold. The presence of water shortened the formation time of sol, and the specific concentration of hydrochloric acid stabilized the colloid system. The presence of Co(II) chloride enhanced the hydrolysis rate of tetraethoxysilane and the condensation rate of hydroxy derivatives. In contrast, Ti(IV) tetra-n-butoxide showed the opposite effect, slowing these processes and decreasing the degree of condensation of siloxane chains. The results of this study can be used to optimize the composition of stable homogeneous solutions to synthesize TiO2, TiO2–SiO2, TiO2–CoxOy, and TiO2–SiO2–CoxOy sols. [Figure not available: see fulltext.]. © 2019, Springer Science+Business Media, LLC, part of Springer Nature.
Cite:
Brichkov A.S.
, Brichkova V.Y.
, Paukshtis E.A.
, Chen Y-W.
, Kozik V.V.
Effects of Preparation Parameters on the Characteristics of SiO2- and CoxOy-Modified-TiO2 Colloids Prepared by Hydrolysis of Titanium Alkoxide
Journal of Sol-Gel Science and Technology. 2020. V.94. N3. P.607-615. DOI: 10.1007/s10971-019-05139-4 WOS Scopus РИНЦ AN OpenAlex
Effects of Preparation Parameters on the Characteristics of SiO2- and CoxOy-Modified-TiO2 Colloids Prepared by Hydrolysis of Titanium Alkoxide
Journal of Sol-Gel Science and Technology. 2020. V.94. N3. P.607-615. DOI: 10.1007/s10971-019-05139-4 WOS Scopus РИНЦ AN OpenAlex
Dates:
| Submitted: | Nov 29, 2018 |
| Accepted: | Sep 17, 2019 |
| Published online: | Nov 23, 2019 |
| Published print: | Jun 1, 2020 |
Identifiers:
| Web of science: | WOS:000501026400002 |
| Scopus: | 2-s2.0-85075360767 |
| Elibrary: | 43207118 |
| Chemical Abstracts: | 2019:2220608 |
| OpenAlex: | W2990545046 |