Prof. Dr. Klaus Rademann

Klaus Rademann erforscht die Synthese und Charakterisierung von Nanomaterialien und Nanostrukturen, insbesondere Metallcluster, Bismut-Nanopartikel und magnetische Elastomere. Seine aktuelle Arbeit konzentriert sich auf die kontrollierte Herstellung kristalliner Phasen im Nichtgleichgewicht sowie auf die Entwicklung funktionaler Materialien für technische Anwendungen wie induktive Übertrager. Für Unternehmen relevant sind die Erkenntnisse zur gezielten Steuerung von Materialeigenschaften und zur additiven Fertigung magnetischer Komponenten, die in der Elektrotechnik, Sensorik und Materialwissenschaft Anwendung finden.

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• Gold und Silber als Cluster in WW mit Lanthanoiden

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  Förderer: DFG Sachbeihilfe Zeitraum: 11/2006 - 12/2007 Projektleitung: Prof. Dr. Klaus Rademann

• Reactive Chemical Channels: A joint Experimental-Theoretical Program

  Quelle ↗

  Förderer: German-Israeli Foundation Zeitraum: 01/2007 - 12/2010 Projektleitung: Prof. Dr. Klaus Rademann

• Metallcluster in Natron-Kalk-Silikatglas: Bildungsmechanismen, Nukleation und Wachstum

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  Förderer: DFG Sachbeihilfe Zeitraum: 12/2009 - 01/2011 Projektleitung: Prof. Dr. Klaus Rademann

• Mechanochemical Synthesis of Metal−Organic Frameworks: A Fast and Facile Approach toward Quantitative Yields and High Specific Surface Areas

  2010

  Chemistry of Materials · DOI

  The strategy of utilizing mechanochemical synthesis to obtain metal−organic frameworks (MOFs) with high surface areas is demonstrated for two model systems. The compounds HKUST-1 (Cu 3 (BTC) 2, BTC = 1,3,5-benzenetricarboxylate) and MOF-14 (Cu 3 (BTB) 2, BTB = 4,4′,4′′-benzenetribenzoate) were synthesized by ball milling and characterized by powder X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and thermal analysis (DTA/DTG/MS). The specific surface area (SSA) of both compounds was characterized by nitrogen adsorption. To verify these results and to understand how the synthetic conditions influence the pore structure and the surface area, additional small-angle X-ray scattering (SAXS) experiments were carried out. Our investigations confirm that this synthesis approach is a promising alternative method for distinct MOFs. This facile method leads to materials with surface areas of 1713 m 2 /g, which is comparable to the highest given values in the literature for the respective compounds.

• Turkevich in New Robes: Key Questions Answered for the Most Common Gold Nanoparticle Synthesis

  2015

  ACS Nano · DOI

  This contribution provides a comprehensive mechanistic picture of the gold nanoparticle synthesis by citrate reduction of HAuCl4, known as Turkevich method, by addressing five key questions. The synthesis leads to monodisperse final particles as a result of a seed-mediated growth mechanism. In the initial phase of the synthesis, seed particles are formed onto which the residual gold is distributed during the course of reaction. It is shown that this mechanism is a fortunate coincidence created by a favorable interplay of several chemical and physicochemical processes which initiate but also terminate the formation of seed particles and prevent the formation of further particles at later stages of reaction. Since no further particles are formed after seed particle formation, the number of seeds defines the final total particle number and therefore the final size. The gained understanding allows illustrating the influence of reaction conditions on the growth process and thus the final size distribution.