Size-dependent conductivity dispersion of gold nanoparticle colloids in a microchip: Contactless measurements

M. A.H. Khalafalla; A. Mesli; H. M. Widattallah; A. Sellai; S. Al-Harthi; Haider A.J. Al-Lawati; F. O. Suliman

doi:10.1007/s11051-014-2546-4

Size-dependent conductivity dispersion of gold nanoparticle colloids in a microchip: Contactless measurements

M. A.H. Khalafalla^*, A. Mesli, H. M. Widattallah, A. Sellai, S. Al-Harthi, Haider A.J. Al-Lawati, F. O. Suliman

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

We performed admittance measurements to investigate the particle size dependence of the conductivity of gold nanoparticle (Diameters: 6-100 nm) colloids in electrophoresis microchip in the frequency range of 0.03-1.00 MHz. The admittance was measured with two electrodes capacitively coupled to the colloid contained in a microchip capillary channel. The imaginary and real components of the admittance showed low-frequency dispersion associated with the polarization of the nanoparticles induced by the AC electric field. This was evident from the linear dependence of the process relaxation time as a function of the square of the radius of the nanoparticle.

Original language	English
Article number	2546
Journal	Journal of Nanoparticle Research
Volume	16
Issue number	8
DOIs	https://doi.org/10.1007/s11051-014-2546-4
Publication status	Published - Aug 2014

Keywords

Conductivity
Contactless measurement
Gold nanoparticles
Microchip
Relaxation time

ASJC Scopus subject areas

Bioengineering
Atomic and Molecular Physics, and Optics
General Chemistry
Modelling and Simulation
General Materials Science
Condensed Matter Physics

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10.1007/s11051-014-2546-4

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title = "Size-dependent conductivity dispersion of gold nanoparticle colloids in a microchip: Contactless measurements",

abstract = "We performed admittance measurements to investigate the particle size dependence of the conductivity of gold nanoparticle (Diameters: 6-100 nm) colloids in electrophoresis microchip in the frequency range of 0.03-1.00 MHz. The admittance was measured with two electrodes capacitively coupled to the colloid contained in a microchip capillary channel. The imaginary and real components of the admittance showed low-frequency dispersion associated with the polarization of the nanoparticles induced by the AC electric field. This was evident from the linear dependence of the process relaxation time as a function of the square of the radius of the nanoparticle.",

keywords = "Conductivity, Contactless measurement, Gold nanoparticles, Microchip, Relaxation time",

author = "Khalafalla, {M. A.H.} and A. Mesli and Widattallah, {H. M.} and A. Sellai and S. Al-Harthi and Al-Lawati, {Haider A.J.} and Suliman, {F. O.}",

note = "Funding Information: Acknowledgement This work was partially supported by HM Grant N. SRISCI/CHEM 09/01 from Sultan Qaboos University. We are grateful to Dr. Osman A. E. Abdalla (SQU, Geology dept.) for discussions and encouragements.",

year = "2014",

month = aug,

doi = "10.1007/s11051-014-2546-4",

language = "English",

volume = "16",

journal = "Journal of Nanoparticle Research",

issn = "1388-0764",

publisher = "Springer Netherlands",

number = "8",

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T1 - Size-dependent conductivity dispersion of gold nanoparticle colloids in a microchip

T2 - Contactless measurements

AU - Khalafalla, M. A.H.

AU - Mesli, A.

AU - Widattallah, H. M.

AU - Sellai, A.

AU - Al-Harthi, S.

AU - Al-Lawati, Haider A.J.

AU - Suliman, F. O.

N1 - Funding Information: Acknowledgement This work was partially supported by HM Grant N. SRISCI/CHEM 09/01 from Sultan Qaboos University. We are grateful to Dr. Osman A. E. Abdalla (SQU, Geology dept.) for discussions and encouragements.

PY - 2014/8

Y1 - 2014/8

N2 - We performed admittance measurements to investigate the particle size dependence of the conductivity of gold nanoparticle (Diameters: 6-100 nm) colloids in electrophoresis microchip in the frequency range of 0.03-1.00 MHz. The admittance was measured with two electrodes capacitively coupled to the colloid contained in a microchip capillary channel. The imaginary and real components of the admittance showed low-frequency dispersion associated with the polarization of the nanoparticles induced by the AC electric field. This was evident from the linear dependence of the process relaxation time as a function of the square of the radius of the nanoparticle.

AB - We performed admittance measurements to investigate the particle size dependence of the conductivity of gold nanoparticle (Diameters: 6-100 nm) colloids in electrophoresis microchip in the frequency range of 0.03-1.00 MHz. The admittance was measured with two electrodes capacitively coupled to the colloid contained in a microchip capillary channel. The imaginary and real components of the admittance showed low-frequency dispersion associated with the polarization of the nanoparticles induced by the AC electric field. This was evident from the linear dependence of the process relaxation time as a function of the square of the radius of the nanoparticle.

KW - Conductivity

KW - Contactless measurement

KW - Gold nanoparticles

KW - Microchip

KW - Relaxation time

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DO - 10.1007/s11051-014-2546-4

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AN - SCOPUS:84904271721

SN - 1388-0764

VL - 16

JO - Journal of Nanoparticle Research

JF - Journal of Nanoparticle Research

IS - 8

M1 - 2546

ER -

Size-dependent conductivity dispersion of gold nanoparticle colloids in a microchip: Contactless measurements

Abstract

Keywords

ASJC Scopus subject areas

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