Dendrimer-Stabilized Titanate Nanowire Dispersions as Potential Nanocarriers

Marko Pavlovic, Monika Adok-Sipiczki, Endre Horváth, Tamás Szabó, László Forró, Istvan Szilagyi

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The effect of poly(amido amine) (PAMAM) dendrimers of generations G2, G6, and G10 on the dispersion stability of titanate nanowires (TiONWs) as potential nanocarriers was clarified in order to develop biocompatible delivery systems. The PAMAMs adsorbed strongly on the oppositely charged TiONWs even under slightly alkaline conditions where the macromolecules possess low amounts of charged groups and they were able to reverse the charge of the particles. This process resulted in unstable dispersions near the dose where the charge reversal occurred, while stable samples were observed away from it. No generation dependence was found on the aggregation and charging behavior at low ionic strengths. Although heterogeneous adsorption of the dendrimers led to attractive patch-charge interactions at intermediate doses, interparticle forces of electrostatic origin described by Derjaguin and Landau, Verwey, and Overbeek (DLVO) played the major role in colloidal stability. The nanowires were found to adopt a face-to-face orientation within the aggregates, giving rise to the formation of well-defined bundles. Highly stable dispersions were observed once the TiONWs were coated with PAMAM dendrimers of higher generations even at elevated ionic strengths.

Original languageEnglish
Pages (from-to)24919-24926
Number of pages8
JournalJournal of Physical Chemistry C
Volume119
Issue number44
DOIs
Publication statusPublished - Nov 5 2015

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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    Pavlovic, M., Adok-Sipiczki, M., Horváth, E., Szabó, T., Forró, L., & Szilagyi, I. (2015). Dendrimer-Stabilized Titanate Nanowire Dispersions as Potential Nanocarriers. Journal of Physical Chemistry C, 119(44), 24919-24926. https://doi.org/10.1021/acs.jpcc.5b08775