Thermal interface fluctuations of liquids and viscoelastic materials

2017/05/16 by Kenichiro Aoki, Aoki, Kenichiro, Takahisa Mitsui +1 · 1 citation
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Force Microscopy Techniques and Applications #Material Dynamics and Properties #Mechanical and Optical Resonators #Soft Condensed Matter (cond-mat.soft)

paper · pdf · doi:10.48550/arxiv.1705.05630

openalex publication_date 2017/05/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Spectra of thermal fluctuations of a wide range of interfaces, from liquid/air, viscoelastic material/air, liquid/liquid, to liquid/viscoelastic material interfaces, were measured over 100 Hz to 10 MHz frequency range. The obtained spectra were compared with the fluctuation theory of interfaces, and found to be mostly in quite good agreement, when the theory was generalized to apply to thermal fluctuations of liquid/viscoelastic material interfaces. The spectra were measured using a system that combines light reflection, statistical noise reduction through averaged correlations, and confocal microscopy. It requires only a small area of the interface (∼1 μm²) , relatively short times for measurements (\lesssimfew min), and can also be applied to highly viscous materials.

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