Nano/Micro thermophysical properties sensing engineering and its applications

Y. Nagasaka1

1Keio University, Hiyoshi, Yokohama, Japan

Keywords: optical techniques
property: thermophysical properties
material: novel fluids and solids, micro and nano-scale

The present invited lecture overviews new frontiers of sensing techniques for thermophysical properties in micro and nano-scale processes developed at Keio.  Especially, new optical techniques to measure wide variety of thermophysical properties such as thermal diffusivity (Forced Rayleigh Scattering), thermal conductivity (Photothermal Radiometry), viscosity and surface tension (Laser-induced Capillary Wave), diffusion coefficient and Soret coefficient (Soret Forced Rayleigh Scattering), surface viscoelastic properties (Ripplon Surface Laser-Light Scattering) of novel fluids and solids at micro and nano-scale are presented with an emphasis on their engineering applications.  All of these new optical techniques have high spatial and temporal resolutions which have never been attained by any conventional measurement tools.  This high spatial and temporal resolutions enable us to use these new techniques not only for the determination of thermophysical properties but also the detection of new phenomena and the sensing in a feedback control system.  As an example, high-speed sensing of microliter-order whole-blood viscosity using laser-induced capillary wave will be explained.

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