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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Ed. by Rademann, Klaus

12 Issues per year


IMPACT FACTOR 2016: 1.012

CiteScore 2016: 0.99

SCImago Journal Rank (SJR) 2016: 0.463
Source Normalized Impact per Paper (SNIP) 2016: 0.470

Online
ISSN
2196-7156
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Volume 226, Issue 7-8 (Aug 2012)

Issues

Molecular Order and Dynamics of Tris(2-ethylhexyl)phosphate Confined in Uni-Directional Nanopores

Wycliffe Kiprop Kipnusu / Wilhelm Kossack / Ciprian Iacob / Malgorzata Jasiurkowska / Joshua Rume Sangoro / Friedrich Kremer
Published Online: 2012-08-13 | DOI: https://doi.org/10.1524/zpch.2012.0287

Abstract

Infrared Transition Moment Orientational Analysis (IR–TMOA) and Broadband Dielectric Spectroscopy (BDS) are combined to study molecular order and dynamics of the glass-forming liquid Tris(2-ethylhexy)phosphate (TEHP) confined in uni-directional nanopores with diameters of 4, 8, and 10.4 nm. The former method enables one to determine the molecular order parameter of specific IR transition moments. It is observed that the central P=O moiety of TEHP has a weak orientational effect (molecular order parameter Sz = −0.1 ± 0.04) due the nanoporous confinement, in contrast to the terminal C–H groups. BDS traces the dynamic glass transition of the guest molecules in a broad spectral range and at widely varying temperature. An enhancement of the mobility takes place when approaching the glass transition temperature and becomes more pronounced with decreasing pore diameter. This is attributed to a slight reduction of the density of the confined liquid caused by the 2-dimensional geometrical constraint.

Keywords: Dynamics; Confinement; Order; Orientation

About the article

* Correspondence address: University of Leipzig, Institute of Experimental Physics I, Linnestraße 5, 04103 Leipzig, Deutschland,


Published Online: 2012-08-13

Published in Print: 2012-08-01


Citation Information: Zeitschrift für Physikalische Chemie, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1524/zpch.2012.0287.

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