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Dynamics of ultrasonically induced birefringence of in rod-like colloidal solutions |
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| Authors: | Matsuoka Tatsuro Yasuda Keiji Yamamoto Ken Koda Shinobu Nomura Hiroyasu |
| Institution: | aDepartment of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan bDepartment of Chemical Engineering, Graduate School of Engineering, Nagoya, University, Chikusa-ku, Nagoya 464-8603, Japan cDepartment of Natural Sciences, College of Science and Engineering, Tokyo Denki University, Hatoyama, Hiki-Gun, Saitama 350-0394, Japan |
| Abstract: | This review summarized our experimental studies of ultrasonically induced birefringence on aqueous solution of rigid rod-like colloids and rod-like micelles from the view point of dynamics of particle orientation. For rigid rod-like colloids in dilute concentration, the orientational relaxation time was described in terms of the Debye–Einstein equation. This indicated that the ultrasonically induced birefringence could be one of useful tools for determining the size of particles of anisotropic shape. For rod-like micelles, the birefringence showed anomalous damping oscillation when the rod-like micelle was in an entangling state. The mechanism of damping oscillation was discussed using the results of the rheological measurements. |
| Keywords: | Ultrasonically induced birefringence Orientational relaxation Rod-like colloids Debye–Einstein equation Rod-like micelle |
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