Issue 21, 2019
From the journal:

Physical Chemistry Chemical Physics

The role of pH, metal ions and their hydroxides in charge reversal of protein-coated nanoparticles†

Jonas Schubert, ORCID logo *ab   Carmen Radeke,a   Andreas Feryab  and  Munish Chanana ORCID logo *cd  

* Corresponding authors

a Leibniz Institute of Polymer Research Dresden, 01069 Dresden, Germany
E-mail: schubert-jonas@ipfdd.de

b Physical Chemistry of Polymer Materials, Technische Universität Dresden, D-01062 Dresden, Germany

c Institute of Building Materials, ETH Zürich, Zürich, Switzerland
E-mail: chananam@ethz.ch

d Department of Physical Chemistry II, University of Bayreuth, 95447 Bayreuth, Germany

Abstract

In this study, we investigated charge inversion of protein-coated Au nanoparticles caused by the addition of metal ions. The addition of hydrolyzable metal ions (Lewis acids) can induce drastic pH changes and depending on this pH, the metal ions (e.g. M3+) are readily converted into the hydrolyzed species (MOH2+, M(OH)2+) or even into hydroxides (M(OH)3). Adsorbed metal hydroxides were identified to cause the charge inversion of the NPs by using a combination of cryo-TEM, EFTEM and ζ-potential measurements.

Graphical abstract: The role of pH, metal ions and their hydroxides in charge reversal of protein-coated nanoparticles

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Article information

DOI
https://doi.org/10.1039/C8CP05946B
Article type
Paper
Submitted
21 Sep 2018
Accepted
26 Apr 2019
First published
29 Apr 2019
This article is Open Access
Creative Commons BY license

Phys. Chem. Chem. Phys., 2019,21, 11011-11018

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The role of pH, metal ions and their hydroxides in charge reversal of protein-coated nanoparticles

J. Schubert, C. Radeke, A. Fery and M. Chanana, Phys. Chem. Chem. Phys., 2019, 21, 11011 DOI: 10.1039/C8CP05946B

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