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전명석,( R. W. Lovitt ),( W. R. Bowen ) 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
Long-range interactions are important to understand the physicochemical phenomena of electric field in either micro-biochip or MEMS devices confined to the charged solid wall and to analyze the behavior of complex fluids dispersed by either colloids or nanoparticles. Atomic force microscopy (AFM) results were obtained for electrostatic interaction force profiles between a silicon nitride tip and a silica surface by the traditional method as well as between a spherical silica particle and a silica surface employing a colloid probe technique. Distances ranging several tens of nanometers were successfully measured under a contact mode in 1.0 mM KCl electrolyte solution at different pH values. Experimental results obtained by the colloid probe were compared with the calculations from Derjaguin approximation as well as rigorous numerical method. As the separation distance between the silica surface and silica particle is decreased, the approximation under constant potential gives greater interaction than our measured values, with its difference becoming large. AFM results in PDMS-based microfluidic channel are also presented.
Tang, X.,Schneider, J.,Dollinger, A.,Luo, Y.,Wö,rz, A. S.,Judai, K.,Abbet, S.,Kim, Y. D.,Gantefö,r, G. F.,Fairbrother, D. H.,Heiz, U.,Bowen, K. H.,Proch, S. The Royal Society of Chemistry 2014 Physical chemistry chemical physics Vol.16 No.14
<P>Recent research in heterogeneous catalysis, especially on size-selected model systems under UHV conditions and also in realistic catalytic environments, has proved that it is necessary to think in terms of the exact number of atoms when it comes to catalyst design. This is of utmost importance if the amount of noble metal, gold in particular, is to be reduced for practical reactions like CO oxidation. Here it is shown that on TiO<SUB>2</SUB> only Au<SUB>6</SUB> and Au<SUB>7</SUB> clusters are active for CO oxidation which holds for the single crystal, thin films, and titania clusters deposited on HOPG. Size-selected cluster deposition and TPD methods have been employed to investigate the CO oxidation activity of Au<SUB><I>n</I></SUB>/TiO<SUB>2</SUB> systems which are compared to recent results reported by Lee <I>et al.</I> to form a consistent picture in which only two species can be regarded as “active”. The efficiency of investigated Au<SUB><I>n</I></SUB>/(TiO<SUB>2</SUB>)<SUB>93</SUB>/HOPG composite materials is attributed to carbon-assisted oxygen spillover from gold to support particles and across grain boundaries.</P> <P>Graphic Abstract</P><P>The probability of creating CO oxidation-active species on TiO<SUB>2</SUB> is very small since only Au<SUB>6</SUB> and Au<SUB>7</SUB> are catalytically active. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp00160e'> </P>