Scientific article

Influence of Protamine Functionalization on the Colloidal Stability of 1D and 2D Titanium Oxide Nanostructures

Published inLangmuir, vol. 33, no. 38, p. 9750-9758
Publication date2017

The colloidal stability of titanium oxide nanosheets (TNS) and nanowires (TiONW) was studied in the presence of protamine (natural polyelectrolyte) in aqueous dispersions, where the nanostructures possessed negative net charge, and the protamine was positively charged. Regardless of their shape, similar charging and aggregation behaviors were observed for both TNS and TiONW. Electrophoretic experiments performed at different protamine loadings revealed that the adsorption of protamine led to charge neutralization and charge inversion depending on the polyelectrolyte dose applied. Light scattering measurements indicated unstable dispersions once the surface charge was close to zero or slow aggregation below and above the charge neutralization point with negatively or positively charged nanostructures, respectively. These stability regimes were confirmed by the electron microscopy images taken at different polyelectrolyte loadings. The protamine dose and salt-dependent colloidal stability confirmed the presence of DLVO-type interparticle forces, and no experimental evidence was found for additional interactions (e.g., patch-charge, hydrophobic, or steric forces), which are usually present in similar polyelectrolyte−particle systems. These findings indicate that the polyelectrolyte adsorbs on the TNS and TiONW surfaces in a flat and extended conformation giving rise to the absence of surface heterogeneities. Therefore, protamine is an excellent biocompatible candidate to form smooth surfaces, for instance in multilayers composed of polyelectrolytes and particles to be used in biomedical applications.

Research group
Citation (ISO format)
ROUSTER, Paul et al. Influence of Protamine Functionalization on the Colloidal Stability of 1D and 2D Titanium Oxide Nanostructures. In: Langmuir, 2017, vol. 33, n° 38, p. 9750–9758. doi: 10.1021/acs.langmuir.7b01815
Main files (1)
Article (Published version)
ISSN of the journal0743-7463

Technical informations

Creation03/12/2018 3:57:00 PM
First validation03/12/2018 3:57:00 PM
Update time03/15/2023 7:58:07 AM
Status update03/15/2023 7:58:07 AM
Last indexation01/17/2024 2:27:35 AM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack