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Forces on an attractive surface generated from a thermoresponsive polymer gel

Zoran Konkoli (Institutionen för mikroteknologi och nanovetenskap, Bionanosystem) ; Ilona Wegrzyn (Institutionen för kemi- och bioteknik, Fysikalisk kemi) ; Aldo Jesorka (Institutionen för kemi- och bioteknik, Fysikalisk kemi)
AIP Advances Vol. 4 (2014), 8, p. 087137 .
[Artikel, refereegranskad vetenskaplig]

Interaction between polymers and soft-matter surfaces in the biological cell is a common yet incompletely understood phenomenon. This work investigates a generic situation where a thermoresponsive polymer gel is placed in the vicinity of an adsorbing surface, and starts contracting. The force is mediated by polymer chains that partially attach to the surface and partially to the contracting gel. The main goal was to understand how the force generated by the transforming polymer gel depends on key parameters that describe the system, most importantly, the concentration of the polymer, the length of the force-mediating polymer, and the the distance between the surface and the outer border of the contracting polymer gel. The key result of the paper is the Laplace transform (with regard to the polymer length) of the pulling force expression. Analytical approximations for the force have been obtained, and the exact expression for the pulling force is presented for the situation when the gel starts contracting. In depth analysis of the force behavior revealed several phases adopted by the polymer during the gel contraction.

Nyckelord: polymers, gels, Green's function method, adsorption, free energy



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Denna post skapades 2014-08-27. Senast ändrad 2016-06-30.
CPL Pubid: 202025

 

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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Bionanosystem (2007-2015)
Institutionen för kemi- och bioteknik, Fysikalisk kemi (2005-2014)

Ämnesområden

Nanovetenskap och nanoteknik
Biologisk fysik
Kemisk fysik
Polymerkemi

Chalmers infrastruktur