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Appl. Sci. 2018, 8(8), 1343; https://doi.org/10.3390/app8081343

The Mixed-Electrode Concept for Understanding Growth and Aggregation Behavior of Metal Nanoparticles in Colloidal Solution

Institute for Micro- und Nanotechnologies/Institute for Chemistry and Biotechnology, Department for Physical Chemistry and Microreaction Technology, Ilmenau Technology University, D-98693 Thüringen, Germany
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Received: 29 June 2018 / Revised: 1 August 2018 / Accepted: 3 August 2018 / Published: 10 August 2018
(This article belongs to the Section Nanotechnology and Applied Nanosciences)
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Abstract

The growth and aggregation behavior of metal nanoparticles can be modulated by surfactants and different other additives. Here the concept of how open-circuit mixed electrodes helps to understand the electrical aspects of nanoparticle growth and the consequences for the particle geometries is discussed. A key issue is the self-polarization effect of non-spherical metal nanoparticles, which causes a local decoupling of anodic and partial processes and asymmetry in the local rates of metal deposition. These asymmetries can contribute to deciding to the growth of particles with high aspect ratios. The interpretation of electrochemical reasons for particle growth and behavior is supported by experimental results of nanoparticle syntheses supported by microfluidics which can supply high yields of non-spherical nanoparticles and colloidal product solutions of high homogeneity. View Full-Text
Keywords: metal nanoparticles; particle growth; anisotropy; mixed electrode; self-polarization; aspect ratios metal nanoparticles; particle growth; anisotropy; mixed electrode; self-polarization; aspect ratios
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Köhler, J.M.; Knauer, A. The Mixed-Electrode Concept for Understanding Growth and Aggregation Behavior of Metal Nanoparticles in Colloidal Solution. Appl. Sci. 2018, 8, 1343.

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