Mahata , S. and Mondal, B. and Mahata, S.S. and Usha, K. and Mandal, N. and Mukherjee, K. (2015) Chemical modification of titanium isopropoxide for producing stable dispersion of titania nano-particles. Materials Chemistry and Physics, 151. pp. 267-274.

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Stable colloidal TiO2 nano-particles are synthesized through the controlled hydrolysis of chemically modified titanium (Ti) isopropoxide with acetylacetone and acetic acid whereas ammonium salts of poly(acrylic acid) is used as a dispersing agent. Acetylacetone and acetic acid used as chelating ligand to retard the hydrolysis and condensation rates. The process is found promising for producing homogeneous aqueous phase colloidal dispersion of TiO2 particles. Fourier transformed infrared and nuclear magnetic resonance spectra reveal the formation of monodentate bridging of ligands with Ti-isopropoxide. UV–Vis spectroscopy confirms the effective adsorption of poly(acrylic acid) within the modified Ti precursor. Zeta potential of modified titanium isopropoxide precursor is measured to understand its stability in different pH. The thermal stability of the precursors modified with different chelating ligands and dispersing agent has been studied using thermo-gravimetric in conjunction to differential thermal analysis (TG-DTA). Phase formation behavior and the morphological features of the synthesized particles are studied using X-ray diffraction and electron microscopy techniques. The sizes of the anatase phase particles are found in the range of 12–20 nm. - Highlights: • Nanosized colloidal TiO2 is prepared by controlled hydrolysis of Ti-isopropoxide. • Effect of chelating and dispersing agent on stability of colloidal TiO2 is studied. • Phase, morphology and stability of colloidal TiO2 are investigated. • The sizes of synthesized TiO2 particles are found in the range of 12–20 nm. • Suitable chelating and dispersing agent can improve particle loading in sol

Item Type: Article
Subjects: Materials
Depositing User: Dr. Sarita Ghosh
Date Deposited: 05 Aug 2016 05:55
Last Modified: 05 Aug 2016 05:55

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