Doctoral thesis
OA Policy
English

Interaction forces between colloidal latex particles and their modification by polyelectrolytes

ContributorsFinessi, Marco
Defense date2013-06-28
Abstract

This thesis focuses the attention on the interaction forces between negatively charged carboxyl and sulfate latex particles with adsorbed on them respectively different generations of cationic poly(amido amine) PAMAM dendrimers and Linear (Polyethylene imine) (LPEI) having two different molecular masses. Those systems were investigated through the colloidal probe technique based on atomic force microscopy (AFM). Tuning the dendrimers/polyelectrolytes dose adsorbed, the interaction forces are observed to switch from repulsive into attractive and back to repulsive again in the both cases. Close to the IEP, the surface of the whole particle is totally neutralized by the adsorbtion of the dendrimers/polyelectrolytes. In the case of dendrimers, this situation is described by the sum of two attractive forces: a long range van der Waals interaction and short range non-DLVO forces given by patch charge interactions. In the case of LPEI the attractive forces are described in term of the pure DLVO theory.

Keywords
  • Colloidal probe
  • AFM
  • dendrimers
  • LPEI
  • patch charge interactions
  • van der Waals interactions
  • Poisson-Boltzmann
  • patch-charge interactions
  • DLVO
Citation (ISO format)
FINESSI, Marco. Interaction forces between colloidal latex particles and their modification by polyelectrolytes. Doctoral Thesis, 2013. doi: 10.13097/archive-ouverte/unige:28989
Main files (1)
Thesis
accessLevelPublic
Identifiers
1239views
804downloads

Technical informations

Creation07/16/2013 5:52:00 PM
First validation07/16/2013 5:52:00 PM
Update time03/14/2023 8:21:06 PM
Status update03/14/2023 8:21:06 PM
Last indexation05/13/2025 4:25:49 PM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack