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Related Experiment Video

Updated: Feb 19, 2026

A High Performance Impedance-based Platform for Evaporation Rate Detection

A High Performance Impedance-based Platform for Evaporation Rate Detection

Published on: October 17, 2016

High-sensitivity method for detecting dielectric changes in water driven by biomolecular hydration.

Masahiko Imashimizu¹, Jun-Ichi Sugiyama^2,3

¹Cellular and Molecular Biotechnology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan.

Biophysics and Physicobiology

|February 18, 2026

Summary

Sub-terahertz irradiation accelerates protein hydration. Researchers identified the microwave dielectric measurement signal

Keywords:

destructive interference dielectric permittivity hydration short-path-length microwave reflection sub-terahertz irradiation

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Last Updated: Feb 19, 2026

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In Situ Characterization of Hydrated Proteins in Water by SALVI and ToF-SIMS

In Situ Characterization of Hydrated Proteins in Water by SALVI and ToF-SIMS

Published on: February 15, 2016

Area of Science:

Physical Chemistry
Biophysics
Spectroscopy

Background:

Sub-terahertz irradiation accelerates hydration structure formation in protein aqueous solutions post-mixing.
A microwave dielectric measurement technique was developed to monitor these hydration changes.
Previous work showed signal modulation in short-path-length samples but lacked physical origin clarity.

Purpose of the Study:

To elucidate the physical origin of the microwave dielectric measurement signal.
To establish a clear measurement principle for dielectric changes in biomolecular hydration.
To enable direct evaluation of hydration from raw reflection data.

Main Methods:

Utilized a microwave dielectric measurement technique with short-path-length samples.
Analyzed multiply reflected signals modulated by dielectric properties.
Investigated the interference patterns under specific short-path-length conditions ( $d = λ / 4$ ).

Main Results:

Identified the signal origin as destructive interference between probe-sample and container bottom reflections.
This interference occurs uniquely under the $d = λ / 4$ condition.
Demonstrated direct evaluation of dielectric changes without complex permittivity conversion.

Conclusions:

Established the physical basis for the microwave dielectric measurement technique.
The technique allows direct assessment of biomolecular hydration dynamics.
This advances the study of nonequilibrium hydration phenomena in biological systems.