24 February 2009 Relation between diffusion constant and particle density in TiO2 suspended solutions
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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.
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Chen Zhang, Xingyu Zhang, Qingpu Wang, Shuzhen Fan, Zhengping Wang, Ruijun Lan, 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); doi: 10.1117/12.811011; https://doi.org/10.1117/12.811011

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