1996 Fiscal Year Final Research Report Summary
The Study of Dynamic Properties of Liquid Surface
| Project/Area Number |
07650068
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied physics, general
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| Research Institution | Japan Wamen's University |
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Principal Investigator |
OZAWA Atsumi Japan Wamen's University, Science, Assistant, 理学部, 助手 (30156179)
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| Project Period (FY) |
1995 – 1996
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| Keywords | ripplon / exciting capillary wave / surface tension / soluble monolayr / light scattering technique / latex |
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| Research Abstract |
The equilibrim surface concentration is determined by the balance between surfactant molecules and solvent. We can acquire knowledge about the dynamic behavior of the surfactant molecules near the surface by investigating the formation process of the surface layr. What is most important in the study of the dynamic properties of liquid surface is to observe the phenomenon over a wide frequency range. Surface wave measurements have been performed for this purpose. In the low frequency range between 1kHz-10kHz, we used a technique for exciting capillary waves on liquid surface and observed their propagation. We constructed the light scattering technique as a new method of surface weve measurement above 10kHz. The coherent light of an YAG laser is incident on the liquid surface and scattered by a thermally excited ripplon. The scattered light is observed with the light beating technique. Dispersion relation of ripplon on pure water surface was thus measured in a wide frequency range from 10kHz to 1MHz. The surface tensions obtained from the ripplon propagation agreed well with the literature values with the accuracy of 1%. By forcusing the probe laser at the water surface to the spot size within the range of the coherent length of ripplon, we could make remarkable improvement of the S/N ratio. The time required for the measurement was successfuly reduced to a few seconds.
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