Universität zu Köln

Wang, Zilin, Niether, Doreen, Buitenhuis, Johan ORCID: 0000-0001-8849-2596, Liu, Fipyi, Lang, Peter R., Dhont, Jan K. G. and Wiegand, Simone ORCID: 0000-0001-6333-1956 (2019). Thermophoresis of a Colloidal Rod: Contributions of Charge and Grafted Polymers. Langmuir, 35 (4). S. 1000 - 1008. WASHINGTON: AMER CHEMICAL SOC. ISSN 0743-7463

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Abstract

In this study, we investigated the thermodiffusion behavior of a colloidal model system as a function of the Debye length, lambda(DH), which is controlled by the ionic strength. Our system consists of an fd-virus grafted with poly(ethylene glycol) (PEG) with a molecular mass of 5000 g mol(-1). The results are compared with recent measurements on a bare fdvirus and with results of PEG. The diffusion coefficients of both viruses are comparable and increase with the increasing Debye length. The thermal diffusion coefficient, D-T, of the bare virus increases strongly with the Debye length, whereas D-T of the grafted fd-virus shows only a very weak increase. The Debye length dependence of both systems can be described with an expression derived for charged rods using the surface charge density and an offset of D-T as adjustable parameters. It turns out that the ratio of the determined surface charges is inverse to the ratio of the surfaces of the two systems, which means that the total charge remains almost constant. The determined offset of the grafted fd-virus describing the chemical contributions is the sum of D-T of PEG and the offset of the bare fd-virus. At high lambda(DH), corresponding to the low ionic strength, the S-T values of both colloidal model systems approach each other. This implies a contribution from the polymer layer, which is strong at short lambda(DH) and fades out for the longer Debye lengths, when the electric double layer reaches further than the polymer chains and therefore dominates interactions with the surrounding water.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wang, Zilin UNSPECIFIED UNSPECIFIED UNSPECIFIED Niether, Doreen UNSPECIFIED UNSPECIFIED UNSPECIFIED Buitenhuis, Johan UNSPECIFIED orcid.org/0000-0001-8849-2596 UNSPECIFIED Liu, Fipyi UNSPECIFIED UNSPECIFIED UNSPECIFIED Lang, Peter R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dhont, Jan K. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wiegand, Simone UNSPECIFIED orcid.org/0000-0001-6333-1956 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-158814
DOI:	10.1021/acs.langmuir.8b03614
Journal or Publication Title:	Langmuir
Volume:	35
Number:	4
Page Range:	S. 1000 - 1008
Date:	2019
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	0743-7463
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Physical Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language THERMAL-DIFFUSION; TEMPERATURE-DEPENDENCE; SORET COEFFICIENT; FD-VIRUS; POLY(ETHYLENE OXIDE); INTERACTING COLLOIDS; THERMODIFFUSION; WATER; SUSPENSIONS; BEHAVIOR Multiple languages Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15881