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Chen, Chang-Hui,Ravenhill, Emma R.,Momotenko, Dmitry,Kim, Yang-Rae,Lai, Stanley C. S.,Unwin, Patrick R. American Chemical Society 2015 Langmuir Vol.31 No.43
<P>The electrochemical detection of a single nanoparticle (NP) at a support electrode can provide key information on surface chemistry and fundamental electron transfer (ET) properties at the nanoscale. This study employs scanning electrochemical cell microscopy (SECCM) as a fluidic device to both deliver individual citrate-capped gold nanoparticles (AuNPs) and study the interactions between them and a range of alkanethiol-modified Au electrodes with different terminal groups, namely, −COOH, −OH, and −CH<SUB>3</SUB>. Single NP collisions were detected through the AuNP-mediated ET reaction of Fe(CN)<SUB>6</SUB><SUP>4–/3–</SUP> in aqueous solution. The collision frequency, residence time, and current–time characteristics of AuNPs are greatly affected by the terminal groups of the alkanethiol. Methods to determine these parameters, including the effect of the instrument response function, and derive ET kinetics are outlined. To further understand the interactions of AuNPs with these surfaces, atomic force microscopy (AFM) force measurements were performed using citrate-modified Au-coated AFM tips and the same alkanethiol-modified Au substrates in aqueous solution at the same potential bias as for the AuNP collision experiments. Force curves on OH-terminated surfaces showed no repulsion and negligible adhesion force. In contrast, a clear repulsion (on approach) was seen for COOH-terminated surface and adhesion forces (on retract) were observed for both COOH- and CH<SUB>3</SUB>-terminated surfaces. These interactions help to explain the residence times and collision frequencies in AuNP collisions. More generally, as the interfacial properties probed by AFM appear to be amplified in NP collision experiments, and new features also become evident, it is suggested that such experiments provide a new means of probing surface chemistry at the nanoscale.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2015/langd5.2015.31.issue-43/acs.langmuir.5b03033/production/images/medium/la-2015-03033w_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la5b03033'>ACS Electronic Supporting Info</A></P>
Roundtable on Peter J. Katzenstein's Contributions to the Study of East Asian Regionalism
Peter J. Katzenstein,Vinod K. Aggarwal,Min Gyo Koo,Amitav Acharya,Richard Higgott,John Ravenhill 동아시아연구원 2007 Journal of East Asian Studies Vol.7 No.3
Over the past decade, Peter J. Katzenstein has made enormous contributions to our theoretical and empirical understanding of Asian economic and security regionalism, which has been manifested by the proliferation of intra- and extra-regional free trade agreements, regional financial institutions, and cooperative regional security dialogues. Katzensteins scholarly works on Asian regionalism and the changing role of Japan have set the pace for research in the field. In this article, a group of distinguished scholars in the field of Asian regionalismVinod K. Aggarwal, Min Gyo Koo, Amitave Acharya, Richard Higgott, and John Ravenhillcritically evaluate Katzensteins approach to the links among Japan, Asian regionalism, and global politics. In response, Katzenstein argues that Asian (and European) regionalism is linked to the American imperium and to core regional states and that regionalism is best studied with an eclectic approach. For him, regionalism is a force that defines security, economic, and cultural dimensions of world politics, thus bringing about a modicum of order therein.