Development of measurement system using evanescent waves for characterizing colloidal liquids in heat transfer applications

Katsuaki Shirai, S. Kaji, T. Kawanami, S. Hirasawa

Research output: Contribution to journalArticle

Abstract

We report on the development of measurement system for characterizing physico-chemical properties of colloidal liquids used in heat transfer applications. In future thermal management, colloids consisting of micro- and nano-sized particles will play major roles in heat transfer for thermal storage and heat-transfer enhancement. In these applications, an important issue is the dispersion stability of colloidal particles. The functionality of the colloidal liquids becomes deteriorated when the particles aggregate and turn into sedimentation. The dispersion of colloidal liquid is maintained by the interaction of elec-trokinetic forces acting on the particles. The electrostatic state of the surface of a particle is represented by zeta potential, which represents the electrical potential difference between the particle surface and the surrounding. The zeta potential can be measured from the mobility of colloidal particles under electrophoresis. We use a pair of evanescent waves for measuring the zeta potential of colloidal particles. An evanescent wave propagates along an interface and exponentially attenuates away from it. The use of evanescent waves can achieve a spatial resolution smaller than a micrometer, which is not feasible with a conventional optical system whose resolution is bounded by diffraction limit. We describe the principle and design of the measurement system. A prototype measurement system was developed in the laboratory. We report on the development and performance of the system for characterizing colloidal particles for heat transfer applications.

Original languageEnglish
Pages (from-to)34-43
Number of pages10
JournalInternational Journal of Computational Methods and Experimental Measurements
Volume5
Issue number1
DOIs
Publication statusPublished - 2017 Jan 1
Externally publishedYes

Fingerprint

Zeta potential
Heat transfer
Liquids
Electrophoresis
Colloids
Sedimentation
Optical systems
Chemical properties
Particles (particulate matter)
Electrostatics
Diffraction

Keywords

  • Colloid
  • Dispersion
  • Evanescent wave
  • Laser measurement
  • Nanofluid
  • Thermal storage
  • Zeta potential

ASJC Scopus subject areas

  • Computational Mechanics
  • Modelling and Simulation
  • Computer Science Applications
  • Computational Mathematics
  • Applied Mathematics

Cite this

@article{186b42f2f6a4411c9e78f9d797cf5102,
title = "Development of measurement system using evanescent waves for characterizing colloidal liquids in heat transfer applications",
abstract = "We report on the development of measurement system for characterizing physico-chemical properties of colloidal liquids used in heat transfer applications. In future thermal management, colloids consisting of micro- and nano-sized particles will play major roles in heat transfer for thermal storage and heat-transfer enhancement. In these applications, an important issue is the dispersion stability of colloidal particles. The functionality of the colloidal liquids becomes deteriorated when the particles aggregate and turn into sedimentation. The dispersion of colloidal liquid is maintained by the interaction of elec-trokinetic forces acting on the particles. The electrostatic state of the surface of a particle is represented by zeta potential, which represents the electrical potential difference between the particle surface and the surrounding. The zeta potential can be measured from the mobility of colloidal particles under electrophoresis. We use a pair of evanescent waves for measuring the zeta potential of colloidal particles. An evanescent wave propagates along an interface and exponentially attenuates away from it. The use of evanescent waves can achieve a spatial resolution smaller than a micrometer, which is not feasible with a conventional optical system whose resolution is bounded by diffraction limit. We describe the principle and design of the measurement system. A prototype measurement system was developed in the laboratory. We report on the development and performance of the system for characterizing colloidal particles for heat transfer applications.",
keywords = "Colloid, Dispersion, Evanescent wave, Laser measurement, Nanofluid, Thermal storage, Zeta potential",
author = "Katsuaki Shirai and S. Kaji and T. Kawanami and S. Hirasawa",
year = "2017",
month = "1",
day = "1",
doi = "10.2495/CMEM-V5-N1-34-43",
language = "English",
volume = "5",
pages = "34--43",
journal = "International Journal of Computational Methods and Experimental Measurements",
issn = "2046-0546",
publisher = "WITPress",
number = "1",

}

TY - JOUR

T1 - Development of measurement system using evanescent waves for characterizing colloidal liquids in heat transfer applications

AU - Shirai, Katsuaki

AU - Kaji, S.

AU - Kawanami, T.

AU - Hirasawa, S.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - We report on the development of measurement system for characterizing physico-chemical properties of colloidal liquids used in heat transfer applications. In future thermal management, colloids consisting of micro- and nano-sized particles will play major roles in heat transfer for thermal storage and heat-transfer enhancement. In these applications, an important issue is the dispersion stability of colloidal particles. The functionality of the colloidal liquids becomes deteriorated when the particles aggregate and turn into sedimentation. The dispersion of colloidal liquid is maintained by the interaction of elec-trokinetic forces acting on the particles. The electrostatic state of the surface of a particle is represented by zeta potential, which represents the electrical potential difference between the particle surface and the surrounding. The zeta potential can be measured from the mobility of colloidal particles under electrophoresis. We use a pair of evanescent waves for measuring the zeta potential of colloidal particles. An evanescent wave propagates along an interface and exponentially attenuates away from it. The use of evanescent waves can achieve a spatial resolution smaller than a micrometer, which is not feasible with a conventional optical system whose resolution is bounded by diffraction limit. We describe the principle and design of the measurement system. A prototype measurement system was developed in the laboratory. We report on the development and performance of the system for characterizing colloidal particles for heat transfer applications.

AB - We report on the development of measurement system for characterizing physico-chemical properties of colloidal liquids used in heat transfer applications. In future thermal management, colloids consisting of micro- and nano-sized particles will play major roles in heat transfer for thermal storage and heat-transfer enhancement. In these applications, an important issue is the dispersion stability of colloidal particles. The functionality of the colloidal liquids becomes deteriorated when the particles aggregate and turn into sedimentation. The dispersion of colloidal liquid is maintained by the interaction of elec-trokinetic forces acting on the particles. The electrostatic state of the surface of a particle is represented by zeta potential, which represents the electrical potential difference between the particle surface and the surrounding. The zeta potential can be measured from the mobility of colloidal particles under electrophoresis. We use a pair of evanescent waves for measuring the zeta potential of colloidal particles. An evanescent wave propagates along an interface and exponentially attenuates away from it. The use of evanescent waves can achieve a spatial resolution smaller than a micrometer, which is not feasible with a conventional optical system whose resolution is bounded by diffraction limit. We describe the principle and design of the measurement system. A prototype measurement system was developed in the laboratory. We report on the development and performance of the system for characterizing colloidal particles for heat transfer applications.

KW - Colloid

KW - Dispersion

KW - Evanescent wave

KW - Laser measurement

KW - Nanofluid

KW - Thermal storage

KW - Zeta potential

UR - http://www.scopus.com/inward/record.url?scp=85070211245&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85070211245&partnerID=8YFLogxK

U2 - 10.2495/CMEM-V5-N1-34-43

DO - 10.2495/CMEM-V5-N1-34-43

M3 - Article

AN - SCOPUS:85070211245

VL - 5

SP - 34

EP - 43

JO - International Journal of Computational Methods and Experimental Measurements

JF - International Journal of Computational Methods and Experimental Measurements

SN - 2046-0546

IS - 1

ER -