Date
Place
- Room H (Room Hall 1, 1F)
- P1. Poster Session I
- August 20, 2015 (Thursday)
- 14:00 ~ 15:30
- [P1-121]
- 14:00 ~ 15:30
- Title:Acoustic Properties of Polydimethylsiloxane as a Function of Pressure
- Sunhyeop Shin, Jae-Hyeon Ko, Jaehoon Park (Hallym Univ., Korea), Young Ho Ko, and Kwang Joo Kim (Agency for Defense Development, Korea)
Abstract: The sound velocity, the acoustic attenuation coefficient, and the refractive index of polydimethylsiloxane (PDMS) were investigated as a function of pressure by using Brillouin spectroscopy and diamond anvil technique. The sound velocity exhibited substantial increase upon compression from ambient pressure to ~1 GPa, which was accompanied by significant reduction of the attenuation coefficient. This crossover behavior at ~1 GPa may be attributed to the complete collapse of available free volume in PDMS and the resulting change in the density. The pressure dependence of the refractive index reflects the corresponding change in the density via the Lorentz-Lorenz relationship. ?
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