The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Shinobu Koda - One of the best experts on this subject based on the ideXlab platform.
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Ultrasonically Induced Birefringence in Liquids and Solutions
Novel Approaches to the Structure and Dynamics of Liquids: Experiments Theories and Simulations, 2020Co-Authors: Hiroyasu Nomura, Tatsuro Matsuoka, Shinobu KodaAbstract:The Birefringence is Induced in liquids and solutions containing certain amount of nonspherical molecules and particles as a result of the orientation of the molecules or particles due to longitudinal ultrasonic waves [1-23] This phenomenon was called as the ultrasonically Induced Birefringence. Early theoretical studies of the Birefringence have been reviewed by Hilyard and Jerrard [1].
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Dynamics of ultrasonically Induced Birefringence of in rod-like colloidal solutions.
Colloids and surfaces. B Biointerfaces, 2006Co-Authors: Tatsuro Matsuoka, Shinobu Koda, Keiji Yasuda, Ken Yamamoto, Hiroyasu NomuraAbstract: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.
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Direct Observation of Sinusoidal Ultrasonically Induced Birefringence in Liquid Crystal in the Isotropic Phase
Japanese Journal of Applied Physics, 2005Co-Authors: Tatsuro Matsuoka, Yoshitaka Mizutani, Shinobu KodaAbstract:Direct observation of sinusoidal ultrasonically Induced Birefringence was successfully carried out in 4-cyano-4'-pentylbiphenyl in the isotropic phase. The temperature dependence of the Birefringence per unit intensity was compared with the estimated value using the theoretical expression for ultrasonically Induced Birefringence based on the de Gennes' phenomenological theory for translational-reorientational coupling. The agreement of the experimental results with those from the estimation validates the theoretical treatment.
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Relationship between segmental anisotropy in polarizability and stationary ultrasonically Induced Birefringence in polymer solutions
Journal of Molecular Liquids, 2004Co-Authors: Hiroyasu Nomura, Tatsuro Matsuoka, Satoru Ando, Shinobu KodaAbstract:Abstract Stationary ultrasonically Induced Birefringence in various polymer solutions was measured in order to investigate its relation to the anisotropy in polarizability of a polymer chain. From the concentration dependence of stationary ultrasonically Induced Birefringence in polystyrene–toluene, polycarbonate–chloroform and polybutadiene–toluene solutions, the intrinsic values of the Birefringence were obtained. A linear relationship between the intrinsic value of the Birefringence per segment and the segmental anisotropy in polarizability was obtained. In aqueous solutions of polyelectrolytes, sodium polystyrenesulfonate and tetramethylammonium polystyrenesulfonate, the Birefringence decreased with ionic strength by the addition of the salts. The stationary Birefringence per ultrasonic intensity for all polymer solutions investigated here decreased with increasing frequency.
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Ultrasonically Induced Birefringence in polymer solutions
Pure and Applied Chemistry, 2004Co-Authors: Hiroyasu Nomura, Tatsuro Matsuoka, Shinobu KodaAbstract:For ultrasonically Induced Birefringence in polymer solutions, both the linear sinu- soidal Birefringence and the nonlinear stationary Birefringence were observed. The sign and value of the stationary ultrasonically Induced Birefringence depended on the molecular struc- ture of segment and its anisotropy in polarizability. Furthermore, no molecular weight de- pendence could be observed above the molecular weight 10 4 . The theory based on the visco- elastic ones using the Rouse-Zimm model could not explain our experimental results as a whole. These results strongly suggest that the stationary ultrasonically Induced Birefringence should be caused by the local segmental motion of polymer chain in solution. For all poly- mer solutions investigated here, the stationary Birefringence per ultrasonic intensity de- creased with increasing frequency. This frequency dependence is not consistent with the present treatment for the ultrasonically Induced Birefringence.
Hiroyasu Nomura - One of the best experts on this subject based on the ideXlab platform.
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Ultrasonically Induced Birefringence in Liquids and Solutions
Novel Approaches to the Structure and Dynamics of Liquids: Experiments Theories and Simulations, 2020Co-Authors: Hiroyasu Nomura, Tatsuro Matsuoka, Shinobu KodaAbstract:The Birefringence is Induced in liquids and solutions containing certain amount of nonspherical molecules and particles as a result of the orientation of the molecules or particles due to longitudinal ultrasonic waves [1-23] This phenomenon was called as the ultrasonically Induced Birefringence. Early theoretical studies of the Birefringence have been reviewed by Hilyard and Jerrard [1].
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Dynamics of ultrasonically Induced Birefringence of in rod-like colloidal solutions.
Colloids and surfaces. B Biointerfaces, 2006Co-Authors: Tatsuro Matsuoka, Shinobu Koda, Keiji Yasuda, Ken Yamamoto, Hiroyasu NomuraAbstract: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.
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Relationship between segmental anisotropy in polarizability and stationary ultrasonically Induced Birefringence in polymer solutions
Journal of Molecular Liquids, 2004Co-Authors: Hiroyasu Nomura, Tatsuro Matsuoka, Satoru Ando, Shinobu KodaAbstract:Abstract Stationary ultrasonically Induced Birefringence in various polymer solutions was measured in order to investigate its relation to the anisotropy in polarizability of a polymer chain. From the concentration dependence of stationary ultrasonically Induced Birefringence in polystyrene–toluene, polycarbonate–chloroform and polybutadiene–toluene solutions, the intrinsic values of the Birefringence were obtained. A linear relationship between the intrinsic value of the Birefringence per segment and the segmental anisotropy in polarizability was obtained. In aqueous solutions of polyelectrolytes, sodium polystyrenesulfonate and tetramethylammonium polystyrenesulfonate, the Birefringence decreased with ionic strength by the addition of the salts. The stationary Birefringence per ultrasonic intensity for all polymer solutions investigated here decreased with increasing frequency.
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Ultrasonically Induced Birefringence in polymer solutions
Pure and Applied Chemistry, 2004Co-Authors: Hiroyasu Nomura, Tatsuro Matsuoka, Shinobu KodaAbstract:For ultrasonically Induced Birefringence in polymer solutions, both the linear sinu- soidal Birefringence and the nonlinear stationary Birefringence were observed. The sign and value of the stationary ultrasonically Induced Birefringence depended on the molecular struc- ture of segment and its anisotropy in polarizability. Furthermore, no molecular weight de- pendence could be observed above the molecular weight 10 4 . The theory based on the visco- elastic ones using the Rouse-Zimm model could not explain our experimental results as a whole. These results strongly suggest that the stationary ultrasonically Induced Birefringence should be caused by the local segmental motion of polymer chain in solution. For all poly- mer solutions investigated here, the stationary Birefringence per ultrasonic intensity de- creased with increasing frequency. This frequency dependence is not consistent with the present treatment for the ultrasonically Induced Birefringence.
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Study on Orientational Motion of Liquid Crystals by Acoustically Induced Birefringence
Japanese Journal of Applied Physics, 1992Co-Authors: Shinobu Koda, Takahiro Koyama, Yuji Enomoto, Hiroyasu NomuraAbstract:The acoustically Induced Birefringence of 4-metoxy-benzilidene-4-n-butylaniline was measured above the temperature of the nematic and isotropic transition point. The Birefringence obtained increased lineally with the square of the ultrasonic power and decreased with increasing temperature. The average orientational relaxation time was estimated from the analysis of the time dependence of the Birefringence.
Y Z Xu - One of the best experts on this subject based on the ideXlab platform.
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stress Induced Birefringence control in optical planar waveguides
Optics Letters, 2003Co-Authors: Xiuli Zhao, Chunfei Li, Y Z XuAbstract:For what is to our knowledge the first time, the thermal-stress formula in analytical form is derived for the core layer in an optical planar waveguide by the thin-film approximation, which is based on a closed-form solution in multilayered isotropic structures off the edges. This formula indicates that elastic, thermal, and structural parameters can affect the magnitude of the stress. Using the formula, one can remove thermal stress and hence stress-Induced Birefringence by proper waveguide design.
H.p. Weber - One of the best experts on this subject based on the ideXlab platform.
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Numerical simulation and analytical description of thermally Induced Birefringence in laser rods
IEEE Journal of Quantum Electronics, 2000Co-Authors: M. Schmid, R. Weber, T. Graf, M. Roos, H.p. WeberAbstract:The results of numerical simulations based on finite-element methods for thermally Induced Birefringence in Nd:YAG crystal rods are compared with measurements and analytical solutions. A novel analytical solution for inhomogeneous pumping is presented. It is shown that the behavior of thermally Induced Birefringence is very sensitive to the pump geometry.
Tatsuro Matsuoka - One of the best experts on this subject based on the ideXlab platform.
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Ultrasonically Induced Birefringence in Liquids and Solutions
Novel Approaches to the Structure and Dynamics of Liquids: Experiments Theories and Simulations, 2020Co-Authors: Hiroyasu Nomura, Tatsuro Matsuoka, Shinobu KodaAbstract:The Birefringence is Induced in liquids and solutions containing certain amount of nonspherical molecules and particles as a result of the orientation of the molecules or particles due to longitudinal ultrasonic waves [1-23] This phenomenon was called as the ultrasonically Induced Birefringence. Early theoretical studies of the Birefringence have been reviewed by Hilyard and Jerrard [1].
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Dynamics of ultrasonically Induced Birefringence of in rod-like colloidal solutions.
Colloids and surfaces. B Biointerfaces, 2006Co-Authors: Tatsuro Matsuoka, Shinobu Koda, Keiji Yasuda, Ken Yamamoto, Hiroyasu NomuraAbstract: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.
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Direct Observation of Sinusoidal Ultrasonically Induced Birefringence in Liquid Crystal in the Isotropic Phase
Japanese Journal of Applied Physics, 2005Co-Authors: Tatsuro Matsuoka, Yoshitaka Mizutani, Shinobu KodaAbstract:Direct observation of sinusoidal ultrasonically Induced Birefringence was successfully carried out in 4-cyano-4'-pentylbiphenyl in the isotropic phase. The temperature dependence of the Birefringence per unit intensity was compared with the estimated value using the theoretical expression for ultrasonically Induced Birefringence based on the de Gennes' phenomenological theory for translational-reorientational coupling. The agreement of the experimental results with those from the estimation validates the theoretical treatment.
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Relationship between segmental anisotropy in polarizability and stationary ultrasonically Induced Birefringence in polymer solutions
Journal of Molecular Liquids, 2004Co-Authors: Hiroyasu Nomura, Tatsuro Matsuoka, Satoru Ando, Shinobu KodaAbstract:Abstract Stationary ultrasonically Induced Birefringence in various polymer solutions was measured in order to investigate its relation to the anisotropy in polarizability of a polymer chain. From the concentration dependence of stationary ultrasonically Induced Birefringence in polystyrene–toluene, polycarbonate–chloroform and polybutadiene–toluene solutions, the intrinsic values of the Birefringence were obtained. A linear relationship between the intrinsic value of the Birefringence per segment and the segmental anisotropy in polarizability was obtained. In aqueous solutions of polyelectrolytes, sodium polystyrenesulfonate and tetramethylammonium polystyrenesulfonate, the Birefringence decreased with ionic strength by the addition of the salts. The stationary Birefringence per ultrasonic intensity for all polymer solutions investigated here decreased with increasing frequency.
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Ultrasonically Induced Birefringence in polymer solutions
Pure and Applied Chemistry, 2004Co-Authors: Hiroyasu Nomura, Tatsuro Matsuoka, Shinobu KodaAbstract:For ultrasonically Induced Birefringence in polymer solutions, both the linear sinu- soidal Birefringence and the nonlinear stationary Birefringence were observed. The sign and value of the stationary ultrasonically Induced Birefringence depended on the molecular struc- ture of segment and its anisotropy in polarizability. Furthermore, no molecular weight de- pendence could be observed above the molecular weight 10 4 . The theory based on the visco- elastic ones using the Rouse-Zimm model could not explain our experimental results as a whole. These results strongly suggest that the stationary ultrasonically Induced Birefringence should be caused by the local segmental motion of polymer chain in solution. For all poly- mer solutions investigated here, the stationary Birefringence per ultrasonic intensity de- creased with increasing frequency. This frequency dependence is not consistent with the present treatment for the ultrasonically Induced Birefringence.