Relation between diffusion constant and particle density in TiO2 suspended solutions

Chen Zhang; Xingyu Zhang; Qingpu Wang; Shuzhen Fan; Zhengping Wang; Ruijun Lan; Xiaoyi Bao

doi:10.1117/12.811011

24 February 2009 Relation between diffusion constant and particle density in TiO₂ suspended solutions

Chen Zhang, Xingyu Zhang, Qingpu Wang, Shuzhen Fan, Zhengping Wang, Ruijun Lan, Xiaoyi Bao

Proceedings Volume 7201, Laser Applications in Microelectronic and Optoelectronic Manufacturing VII; 72011H (2009) https://doi.org/10.1117/12.811011
Event: SPIE LASE: Lasers and Applications in Science and Engineering, 2009, San Jose, California, United States

Abstract

We present time-resolved measurements of pulse transmission at wavelength 532 nm (60 ps pulse width, 10 Hz repetition rate) on samples of titanium powders suspended in methanol. The average particle diameter of the powders is 80 nm. We used a streak camera with 2 ps time revolution to record the transmitted signals. When the particle density is low, the results agreed with the diffusion theory and we obtained the time-independent diffusion constants. By adding the titanium powders gradually in methanol, we obtained the relationship between the diffusion constant and the particle density of TiO₂ in the suspended solution. When using the TiO₂ powders as the sample with a particle density of 1.36x10¹⁵ cm^-3, the experimental result showed a little deviation from the diffusion theory, which may be the signature of localization in the random media.

Citation Download Citation

Chen Zhang, Xingyu Zhang, Qingpu Wang, Shuzhen Fan, Zhengping Wang, Ruijun Lan, and Xiaoyi Bao "Relation between diffusion constant and particle density in TiO₂ suspended solutions", Proc. SPIE 7201, Laser Applications in Microelectronic and Optoelectronic Manufacturing VII, 72011H (24 February 2009); https://doi.org/10.1117/12.811011

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