Project/Area Number  10450032 
Research Category 
GrantinAid for Scientific Research (B).

Section  一般 
Research Field 
Applied physics, general

Research Institution  The University of Tokyo 
Principal Investigator 
HAYAKAWA Reinosuke University of Tokyo, Professor, 大学院・工学系研究科, 教授 (00011106)

CoInvestigator(Kenkyūbuntansha) 
FURUSAWA Hiroshi University of Tokyo, Research Associate, 大学院・工学系研究科, 助手 (20282684)
KIMURA Yasuyuki University of Tokyo, Lecturer, 大学院・工学系研究科, 講師 (00225070)

Project Fiscal Year 
1998 – 1999

Project Status 
Completed(Fiscal Year 1999)

Budget Amount *help 
¥5,500,000 (Direct Cost : ¥5,500,000)
Fiscal Year 1999 : ¥5,500,000 (Direct Cost : ¥5,500,000)

Keywords  electrooptical response / electric birefringence / kerr effect / Twodimensional spectroscopy / relaxational phenomena / polymer / microemulsion / nonlinear response / 電気光学応答 / 電気複屈折 / カー効果 / 2次元スペクトロスコピー / 緩和現象 / 高分子 / マイクロエマルジョン / 非線形 / 液晶 / ゲル / 導電性高分子 
Research Abstract 
A new measurement method for secondorder nonlinear aftereffect function has been developed. Theoretical calculation starting from a general timeevolution equation connects nonlinear responses in time domain and frequency domain, and thus gives the nonlinear response to applied external field of arbitrary form. In addition, it turns out in the frequency domain that the dc component of a secondorder nonlinear response function corresponds to a linear response function. For example, the dc component of the electric birefringence relaxation is equivalent to the dielectric relaxation. This simple relation indicates an advantage of a frequencydomain measurement for nonlinear responses. As an example, the electric birefringence relaxation is measured in twodimensional frequency domain for aqueous solution of sodium poly(styrenesulfonate) to confirm the validity of the theoretical results. The above electric birefringence is caused by the orientation of rodlike molecule without changing the shape under applied electric field. If the molecule can deform, however, the elastic deformation due to electric field will also yield birefringence. Since the deformation has a characteristic timeτ, the electric birefringence is expected to occur in the frequency region of τィイD21ィエD2. By the frequencydomain electric birefringence spectroscopy, we confirmed this prediction with water/AOT/isooctane (w/o) microemulsion, which has dispersed phase of spherical water droplet coated by the monolayer surfactant of AOT in continuous oil phase.
