Understanding the Role of omega-End Groups and Molecular Weight in the Interaction of PNIPAM with Gold Surfaces
Journal article, 2013

Modification of nanoparticle surfaces by adsorption or grafting of polymers allows fine control of hybrid materials propertieds for diverse applications. To obtain such a control, it is of paramount importance to understand the impact of the polymer structure on the nature and strength of its interaction with teh nanoparticle. We investigated here a simple model of hybrid materials made of poly(N-isopropylacrylamide) of different molar masses and end groups interacting with gold surfaces. A series of poly(N-isopropylacrylamide) with number-average molar masses ranging from 3700 to 10000 g.mol(-1) were synthesized by reversible addition-fragmentation chain transfer/macromolecular design by interchange of xanthates (RAFT/MADIX): The terminal xanthate group was then reduced into either a thiol or a hydrogen group. Quartz crystal microbalance adsorption/desorption experiments demonstrated that the polymer termini have a strong impact on the mechanism of polymer adsorption on flat gold surface's. These differences in polymer structure have, in return, a Strong influence on the colloidal stability and growth mechanism of nanoparticles directly synthesized in polymer solution. For those properties, the effect of xanthate group compared very favorably to the conventional thiol moiety. Interestingly, the properties of nanohybrids were, poorly affected by the molar mass of the polymer.

chain-transfer polymerization

polymers

RAFT/MADIX

poly(n-isopropylacrylamide)

PNIPAM

gold nanoparticles

quartz-crystal microbalance

metal

in-situ

protein adsorption

hybrid materials

collapsed states

QCM-D

qcm-d

thermoresponsive polymer

nanoparticles

dissipation

Author

A. Glaria

Universite Paul Sabatier Toulouse III

M. Beija

Universite Paul Sabatier Toulouse III

Romain Bordes

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

SuMo Biomaterials

M. Destarac

Universite Paul Sabatier Toulouse III

J. D. Marty

Universite Paul Sabatier Toulouse III

Chemistry of Materials

0897-4756 (ISSN) 1520-5002 (eISSN)

Vol. 25 9 1868-1876

Subject Categories

Physical Chemistry

DOI

10.1021/cm400480p

More information

Created

10/7/2017