Dopant effects on 2-ethyl-1-hexanol

A dual-channel impedance spectroscopy and neutron scattering study

Lokendra P. Singh, Ahmed Raihane, Christiane Alba-Simionesco, Ranko Richert

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A two-channel impedance technique has been used to study the relaxation behavior of 2-ethyl-1-hexanol with polar and non-polar dopants at the few percent concentration level over a wide temperature and frequency range. The non-polar dopants shift both the Debye and the primary structural relaxation time in the same direction, to shorter times for 3-methylpentane and to longer times for squalane, consistent with the relative glass transition temperatures (Tg) of the components. By contrast, polar dopants such as water or methanol modify the α-process towards slower dynamics and increased amplitude, while the Debye process is accelerated and with a decreased amplitude. This effect of adding water to alcohol is explained by water promoting more compact structures with reduced Kirkwood correlation factors. This picture is consistent with a shift in the neutron scattering pre-peak to lower scattering vectors and with simulation work on alcohol-water systems.

Original languageEnglish (US)
Article number014501
JournalJournal of Chemical Physics
Volume142
Issue number1
DOIs
StatePublished - Jan 7 2015

Fingerprint

Neutron scattering
neutron scattering
Doping (additives)
Spectroscopy
impedance
Water
scattering
water
spectroscopy
alcohols
Alcohols
Structural relaxation
shift
Relaxation time
glass transition temperature
Methanol
methyl alcohol
relaxation time
frequency ranges
Scattering

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Dopant effects on 2-ethyl-1-hexanol : A dual-channel impedance spectroscopy and neutron scattering study. / Singh, Lokendra P.; Raihane, Ahmed; Alba-Simionesco, Christiane; Richert, Ranko.

In: Journal of Chemical Physics, Vol. 142, No. 1, 014501, 07.01.2015.

Research output: Contribution to journalArticle

Singh, Lokendra P. ; Raihane, Ahmed ; Alba-Simionesco, Christiane ; Richert, Ranko. / Dopant effects on 2-ethyl-1-hexanol : A dual-channel impedance spectroscopy and neutron scattering study. In: Journal of Chemical Physics. 2015 ; Vol. 142, No. 1.
@article{4a25c9938c2746219fa94ae1264b20e0,
title = "Dopant effects on 2-ethyl-1-hexanol: A dual-channel impedance spectroscopy and neutron scattering study",
abstract = "A two-channel impedance technique has been used to study the relaxation behavior of 2-ethyl-1-hexanol with polar and non-polar dopants at the few percent concentration level over a wide temperature and frequency range. The non-polar dopants shift both the Debye and the primary structural relaxation time in the same direction, to shorter times for 3-methylpentane and to longer times for squalane, consistent with the relative glass transition temperatures (Tg) of the components. By contrast, polar dopants such as water or methanol modify the α-process towards slower dynamics and increased amplitude, while the Debye process is accelerated and with a decreased amplitude. This effect of adding water to alcohol is explained by water promoting more compact structures with reduced Kirkwood correlation factors. This picture is consistent with a shift in the neutron scattering pre-peak to lower scattering vectors and with simulation work on alcohol-water systems.",
author = "Singh, {Lokendra P.} and Ahmed Raihane and Christiane Alba-Simionesco and Ranko Richert",
year = "2015",
month = "1",
day = "7",
doi = "10.1063/1.4904908",
language = "English (US)",
volume = "142",
journal = "Journal of Chemical Physics",
issn = "0021-9606",
publisher = "American Institute of Physics Publising LLC",
number = "1",

}

TY - JOUR

T1 - Dopant effects on 2-ethyl-1-hexanol

T2 - A dual-channel impedance spectroscopy and neutron scattering study

AU - Singh, Lokendra P.

AU - Raihane, Ahmed

AU - Alba-Simionesco, Christiane

AU - Richert, Ranko

PY - 2015/1/7

Y1 - 2015/1/7

N2 - A two-channel impedance technique has been used to study the relaxation behavior of 2-ethyl-1-hexanol with polar and non-polar dopants at the few percent concentration level over a wide temperature and frequency range. The non-polar dopants shift both the Debye and the primary structural relaxation time in the same direction, to shorter times for 3-methylpentane and to longer times for squalane, consistent with the relative glass transition temperatures (Tg) of the components. By contrast, polar dopants such as water or methanol modify the α-process towards slower dynamics and increased amplitude, while the Debye process is accelerated and with a decreased amplitude. This effect of adding water to alcohol is explained by water promoting more compact structures with reduced Kirkwood correlation factors. This picture is consistent with a shift in the neutron scattering pre-peak to lower scattering vectors and with simulation work on alcohol-water systems.

AB - A two-channel impedance technique has been used to study the relaxation behavior of 2-ethyl-1-hexanol with polar and non-polar dopants at the few percent concentration level over a wide temperature and frequency range. The non-polar dopants shift both the Debye and the primary structural relaxation time in the same direction, to shorter times for 3-methylpentane and to longer times for squalane, consistent with the relative glass transition temperatures (Tg) of the components. By contrast, polar dopants such as water or methanol modify the α-process towards slower dynamics and increased amplitude, while the Debye process is accelerated and with a decreased amplitude. This effect of adding water to alcohol is explained by water promoting more compact structures with reduced Kirkwood correlation factors. This picture is consistent with a shift in the neutron scattering pre-peak to lower scattering vectors and with simulation work on alcohol-water systems.

UR - http://www.scopus.com/inward/record.url?scp=84923790403&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84923790403&partnerID=8YFLogxK

U2 - 10.1063/1.4904908

DO - 10.1063/1.4904908

M3 - Article

VL - 142

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

SN - 0021-9606

IS - 1

M1 - 014501

ER -