Phonon confinement and optical properties in nanosized titanium dioxide by Raman spectroscopy

2001 ◽  
Author(s):  
Ming-Sheng Zhang ◽  
Weifeng Zhang ◽  
Zhen Yin
Keyword(s):  
Raman Spectroscopy ◽  
Titanium Dioxide ◽  
Optical Properties ◽  
Phonon Confinement ◽  
Nanosized Titanium Dioxide

Comparative Effect of Hydrophilic and Lipophilic Nanosized Titanium Dioxide on the Properties of Coated Paper

2012 ◽  
Vol 441 ◽  
pp. 750-753 ◽  
Author(s):  
Yan Jun Tang ◽  
Man Chen ◽  
You Ming Li ◽  
Yu Zhao ◽  
Xiu Mei Zhang
Keyword(s):  
Titanium Dioxide ◽  
Optical Properties ◽  
Surface Properties ◽  
Comparative Effect ◽  
Paper Coating ◽  
Coated Paper ◽  
Surface Strength ◽  
Paper Properties ◽  
Nanosized Titanium Dioxide

In this paper, the effect of the charge of hydrophilic and lipophilic nanosized TiO2 on the optical properties and printability of coated paper was investigated. The parameters including brightness, opacity, surface strength and sizing degree were used to evaluate the optical properties and printability of coated paper. The effects of hydrophilic and lipophilic TiO2 on the properties of coated paper were discussed. It was shown that the optical properties and printability of coated paper increase persistently with the change of nanosized TiO2 charged from 5% to 15%. Once the charge of nanosized TiO2 was over 15%, the main properties of coated paper took on a downward tendency. The properties of coated paper were related to the surface properties of nanosized TiO2 samples. It was found that the lipophilicity of nanosized TiO2 sample played a more important role in the improvement of the coated paper properties, which was believed to be based on the fact that lipophilic nanosized TiO2 could be well compatible with the binders used in the paper coating.

Synthesis, optical properties, and defective structure of carbon-doped titanium dioxide

2013 ◽  
Vol 452 (1) ◽  
pp. 211-214 ◽  
Author(s):  
O. I. Gyrdasova ◽  
I. V. Baklanova ◽  
M. A. Melkozerova ◽  
V. N. Krasil’nikov ◽  
V. G. Bamburov
Keyword(s):  
Titanium Dioxide ◽  
Optical Properties ◽  
Defective Structure ◽  
Carbon Doped ◽  
Doped Titanium Dioxide

Enhancement on Stability of Nanosized Titanium Dioxide in Silicone Suspension Using Diblock Copolymer: Influence of Dispersant Structure

2013 ◽  
Vol 747 ◽  
pp. 599-602
Author(s):  
Surachet Toommee ◽  
Nisanart Traiphol
Keyword(s):  
Titanium Dioxide ◽  
Surface Area ◽  
Diblock Copolymer ◽  
High Efficiency ◽  
Particle Surface ◽  
Ethyl Acrylate ◽  
Polymer Structure ◽  
Particle Agglomeration ◽  
Nanosized Titanium Dioxide ◽  
Enhanced Adsorption

This research investigates using of poly (dimethylsiloxane-b-hydroxy ethyl acrylate) (PDMS-b-PHEA) diblock copolymer to stabilized TiO2nanoparticles in silicone fluid. The polar PHEA segment is expected to anchor on TiO2surface while the non-polar PDMS segment extends into silicone medium. To study effects of polymer structure on its stabilizing efficiency, PDMS-b-PHEA of structures 5-b-0.3, 5-b-1.1 and 8-b-1.0 are used. Results show that suspensions of particle with surface area ~40 and ~200 m2/g can be stabilized for longer than 1 and 7 hrs, respectively. The copolymer with relatively long PHEA and PDMS segments is highly effective as a dispersant. This is due to enhanced adsorption on particle surface and steric stabilization. However, in the system of 40 m2/g-TiO2, excess amounts could lead to polymer entanglement and particle agglomeration. The copolymer dispersant exhibits high efficiency for the 200 m2/g-TiO2suspension as well. In the latter system, higher concentration is required to effectively cover particle surface.

Sol–gel synthesis and optical properties of titanium dioxide thin film

2018 ◽  
Vol 32 (09) ◽  
pp. 1850076 ◽  
Author(s):  
Irfan Ullah ◽  
Shaukat Ali Khattak ◽  
Tanveer Ahmad ◽  
Saman ◽  
Nayab Ali Ludhi
Keyword(s):  
Thin Film ◽  
Titanium Dioxide ◽  
Optical Properties ◽  
Band Gap ◽  
Surface Defects ◽  
Sol Gel ◽  
Luminescent Properties ◽  
Localized States ◽  
Indirect Transition ◽  
Transmission And Absorption

The titanium dioxide (TiO2) is synthesized by sol–gel method using titanium-tetra-iso-propoxide (TTIP) as a starting material, and deposited on the pre-cleaned glass substrate using spin coating technique at optimized parameters. Energy dispersive X-ray (EDX) spectroscopy confirms successful TiO2 growth. The optical properties concerning the transmission and absorption spectra show 85% transparency and 3.28 eV wide optical band gap for indirect transition, calculated from absorbance. The exponential behavior of absorption edge is observed and attributed to the localized states electronic transitions, curtailed in the indirect band gap of the thin film. The film reveals decreasing refractive index with increasing wavelength. The photoluminescence (PL) study ascertains that luminescent properties are due to the surface defects.

Composition and Properties of TiO2 Sol to Produce a Photocatalytic Composite Material

2020 ◽  
Vol 854 ◽  
pp. 45-50
Author(s):  
Ekaterina N. Gubareva ◽  
Valeria V. Strokova ◽  
Yulia N. Ogurtsova ◽  
Pavel S. Baskakov ◽  
Lok Pratap Singh
Keyword(s):  
Composite Material ◽  
Titanium Dioxide ◽  
Ethyl Alcohol ◽  
Titanium Dioxide Nanoparticles ◽  
Sol Gel ◽  
Component Composition ◽  
Optimal Composition ◽  
Optimal Ratio ◽  
Nanosized Titanium Dioxide ◽  
Sol Gel Synthesis

The paper presents the process of sol-gel synthesis of titanium dioxide nanoparticles, the peculiarities of the influence of component composition (titanium precursor content, solvent and stabilizer − surfactant) on the properties of sol and powder obtained on its basis. As a result of the study, the nature of the influence of the type and content of the surfactant in the solution of tetrabutoxytitanium in ethanol on the size of the synthesized particles of titanium dioxide was revealed. The optimal composition of the reaction mixture of TiO–R sol was obtained and the optimal ratio of tetrabutoxytitanium and ethyl alcohol was revealed using which a material with a high content of nanosized titanium dioxide was obtained.

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