Two-dimensional spectroscopy of electrooptical response

电光响应的二维光谱

• 批准号: 10450032
• 负责人: HAYAKAWA Reinosuke
• 金额: $ 3.52万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10450032/
• 关键词: electrooptical response; electric birefringence; kerr effect; Two-dimensional spectroscopy; relaxational phenomena; polymer; micro-emulsion; nonlinear response; 液晶; ゲル; 導電性高分子

A new measurement method for second-order nonlinear after-effect function has been developed. Theoretical calculation starting from a general time-evolution 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 second-order 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 frequency-domain measurement for nonlinear responses. As an example, the electric birefringence relaxation is measured in two-dimensional 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D2-1ィエD2. By the frequency-domain 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 mono-layer surfactant of AOT in continuous oil phase.

开发了一种新的二阶非线性后效应函数测量方法，从一般时间演化方程出发，连接时域和频域的非线性响应，从而给出任意形式的外加场的非线性响应。此外，在频域中，二阶非线性响应函数的直流分量对应于线性响应函数。例如，电双折射弛豫的直流分量相当于介电弛豫关系。表明了频域测量对于非线性响应的优势。例如，在二维频域中测量了聚苯乙烯磺酸钠水溶液的电双折射弛豫，以证实理论结果的有效性。双折射是由于棒状分子在施加电场的情况下不改变形状而产生的取向，但是如果分子可以变形，那么由于电场的弹性变形也会产生双折射。具有特征时间τ，电双折射预计发生在τD2-1D2的频率区域中，通过频域电双折射光谱，我们用分散的水/AOT/异辛烷（w/o）微乳液证实了这一预测。 AOT单层表面活性剂包覆在连续油相中的球形水滴相。

项目成果

K.Hosokawa, T.Shimomura, H.Frusawa, Y.Kimura, K.Ito and R.Hayakawa: "Two-dimensional spectroscopy of electric birefringence relaxation in frequency domain" J.Chem.Phys.110. 4101-4108 (1999)

K.Hosokawa、T.Shimomura、H.Frusawa、Y.Kimura、K.Ito 和 R.Hayakawa：“频域中电双折射弛豫的二维光谱”J.Chem.Phys.110。

Y. Nagamine, et al.: "Low- and high-frequency electric birefringence relaxations in linear polyelectrolyte solutions"Langmuir. 15. 4135-4138 (1999)

Y. Nagamine 等人：“线性聚电解质溶液中的低频和高频电双折射弛豫”Langmuir。

K. Ito, et al.: "Quasi-elastic light scattering with the sinusoidal electric field"Colloids and Surfaces A. 148. 135-148 (1999)

K. Ito 等人：“正弦电场的准弹性光散射”Colloids and Surfaces A. 148. 135-148 (1999)

K. Hosokawa, et al.: "Two-dimensional spectroscopy of electric birefringence relaxation in frequency domain"Journal of Chemical Physics. 110. 401-4108 (1999)

K. Hosokawa 等人：“频域中电双折射弛豫的二维光谱”化学物理杂志。

H.Frusawa and R.Hayakawa: "Field theoretical representation of the Hohenberg-kohn free energy for fluids"Physical Rexiew E. 60. R5048-R5051 (1999)

H.Frusawa 和 R.Hayakawa：“流体的 Hohenberg-kohn 自由能的场理论表示”Physical Rexiew E. 60. R5048-R5051 (1999)