Development of new light scattering spectroscopy for the investigation of mode coupling molecular

开发用于研究模式耦合分子的新型光散射光谱

基本信息

批准号：
14102013
负责人：
TAKAGI Kenshiro
金额：
$ 52.17万
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 (S)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2006
项目状态：
已结题

项目摘要

Soft condensed materials are characterized by their various kinds of internal degrees of freedom. The degrees interact each other and the coupling phenomena between them play important role in determining the complex function of the soft materials. The purpose of this study is to establish the experimental scheme to reveal the physical mechanism of the coupling phenomenon among these internal degrees of freedom.First, we successfully developed the light scattering relaxation spectroscopy technique to directly observe dynamic interaction between the shear motion of fluid and the orientational order parameter in liquid crystals. The role of the dye molecules in enhancing the optical Kerr effect is revealed. The idea of the Brownian motor was applied oanalyze the enhancing mechanism. The wideband spectra showing the rotational relaxation can be now available for various kinds of soft complex systems.Second, We applied the optical beating Brillouin spectroscopy technique to the direct observation of the molecular relaxation. Phonons excited by the thermal fluctuation propagate interacting the other internal degrees of freedom such as the molecular association. The phonon spectrum is then modulated by their motion and the new quasi-elastic component appears. We successfully observed this Mountain component for some organic liquid. The Brillouin spectroscopy is further improved in the study and we can observe the phonon resonance phenomenon giving 0.01 % accuracy in determining the phonon velocity. Te rapid measurement with FFT technique was also realized.Finally, we carried out the quantitative estimation of the coupling viscosity in liquids. Combination of the Brillouin scattering technique and the capillary wave birefringence method enables us to uniquely determine the coupling viscosity as well as the shear and rotational parameters.

柔软的冷凝材料的特征是它们各种内部自由度。该学位相互相互作用，它们之间的耦合现象在确定软材料的复杂功能方面起着重要作用。这项研究的目的是建立实验方案，以揭示这些内部自由度之间耦合现象的物理机制。首先，我们成功地开发了光散射弛豫光谱技术，以直接观察流体的剪切运动与液晶方向阶的剪切运动之间的动态相互作用。染料分子在增强光学KERR效应方面的作用。将布朗电动机的思想应用于增强机制。现在，显示旋转弛豫的宽带光谱可以用于各种软复杂系统。第二，我们将光学节拍布里鲁因光谱技术应用于分子弛豫的直接观察。通过热波动激发的声子传播其他内部自由度，例如分子关联。然后，声子频谱通过其运动调节，并出现新的准弹性分量。我们成功地观察了某些有机液体的山成分。在研究中，布里鲁因光谱进一步改善，我们可以观察到声子共振现象在确定声子速度时具有0.01％的精度。还实现了用FFT技术快速测量。最后，我们对液体中耦合粘度进行了定量估计。布里鲁因散射技术和毛细管波双折射方法的组合使我们能够唯一确定耦合粘度以及剪切和旋转参数。