Pt Nanoparticles via Oil-in-Water Microemulsions Stabilized by a Technical Grade Surfactant: An Economical and Ecological Approach

Ramona Yvette Genevieve König; Cosima Stubenrauch

doi:10.3139/113.110354

Artikel

Pt Nanoparticles via Oil-in-Water Microemulsions Stabilized by a Technical Grade Surfactant: An Economical and Ecological Approach

Ramona Yvette Genevieve König und Cosima Stubenrauch

Veröffentlicht/Copyright: 21. März 2015

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Aus der Zeitschrift Tenside Surfactants Detergents Band 52 Heft 2

Abstract

This study deals with the synthesis of Pt nanoparticles via oil-in-water microemulsions formulated with the technical grade surfactant BIODAC® 510. For this purpose we studied the influence of the Platinum precursor dimethyl(cyclooctadiene)platinum (Pt(COD)Me₂) on the phase behavior of the base microemulsion. It was found that the addition of Pt(COD)Me₂ has nearly no effect on the phase boundaries even at relatively high concentrations. Small angle X-ray scattering data confirmed that the addition of the metal organyl also does not influence the size of the microemulsion droplets. According to transmission electron microscopy (TEM) the size of the resulting platinum nanoparticles is independent on the amount of Pt(COD)Me₂ in the templating microemulsion. This result was rather surprising since it indicates that a greater amount of precursor in the o/w-microemulsion leads to more rather than to larger nanoparticles.

Kurzfassung

In dieser Studie wird systematisch die Synthese von Platin Nanopartikeln in Öl-in-Wasser Mikroemulsionen untersucht. Die Mikroemulsionen sind mit dem technischen Tensid BIODAC® 510 hergestellt worden. Zunächst haben wir den Einfluss des Platin-Präkursors Dimethyl(cyclooctadiene)platin (Pt(COD)Me₂) auf das Phasenverhalten der ternären Mikroemulsion bestimmt. Hierbei konnten wir feststellen, dass die Zugabe von Pt(COD)Me₂ – auch in relativ hohen Konzentrationen – kaum Einfluss auf das Phasenverhalten der Mikroemulsion hat. Durch Kleinwinkelröntgenstreuung konnten wir bestätigen, dass die Zugabe des Platin Präkursors die Größe der Mikroemulsionstropfen ebenfalls nicht verändert. Aufnahmen mit einem Transmissionselektronenmikroskop (TEM) haben gezeigt, dass die Größe der Nanopartikel nicht von der Menge an Pt-Präkursor in der Templatmikroemulsion abhängt. Dieses Ergebnis war unerwartet und deutet darauf hin, dass eine größere Menge Präkursor zu einer größeren Anzahl Nanopartikel und nicht zu einer Zunahme der Nanopartikelgröße führt.

Key words: Nanoparticle synthesis; microemulsions as template; Platinum organyl as precursor; emulsification failure boundary

Stichwörter: Nanopartikelsynthese; Mikroemulsionen als Template; Platinorganyl als Präkusor; emulsification failure boundary

* Correspondence address, Frau Prof. Dr. Cosima Stubenrauch, Institute of Physical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany, Tel.: +49(0)71168564470, Fax: +49(0)71168564443, E-Mail: Cosima.stubenrauch@ipc.uni-stuttgart.de

Prof. Dr. Cosima Stubenrauch studied chemistry at the universities of Münster and Freiburg and received her PhD in Physical Chemistry at the TU Berlin in 1997. After a postdoctoral year at the Université Paris Sud, she worked as an associate researcher and lecturer at the Institute of Physical Chemistry, University of Cologne, from 1999 to 2004. From 2005 to 2009 she worked at University College Dublin. Since 2009 she is professor and head of chair “Physical Chemistry of Condensed Matter” at the University of Stuttgart (Germany). Furthermore, since 2010 she is docent in Physical Chemistry in Thin Films at the KTH Royal Institute of Technology, Stockholm (Sweden).

Dr. Ramona König studied physics at the university of Leipzig (Germany) in the international physics studies program. She completed her Maser thesis in the group of physics of interfaces. In 2013 she received her PhD in Physical Chemistry at the University of Stuttgart (Germany).

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Received: 2014-09-05

Accepted: 2014-12-03

Published Online: 2015-03-21

Published in Print: 2015-03-16

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https://doi.org/10.3139/113.110354

Schlagwörter für diesen Artikel

Nanoparticle synthesis; microemulsions as template; Platinum organyl as precursor; emulsification failure boundary