Sun, 27 Jul 2008 08:00:50 BST CiteULike: dchen's Russell http://www.citeulike.org/user/dchen/author/Russell CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dchen/article/2735554 <i>Langmuir, Vol. 21, No. 1. (4 January 2005), pp. 191-194.</i><br /><br />Abstract: The self-assembly of nanoparticles at fluid interfaces, driven by the reduction in interfacial energy, was investigated. With spherical, tri-n-octyl-phosphine-oxide covered cadium selenide (CdSe) nanoparticles (1-8 nm), thermal fluctuations compete with the interfacial segregation giving rise to a size-dependent self-assembly of the particles. The structure of the nanoparticle assembly was studied using electron microscopy, atomic force microscopy, and X-ray scattering in situ, which indicate that the particles form a densely packed monolayer. The energetics of the adsorption of nanoparticles onto the interface was revealed by time-dependent fluorescence studies on a mixture of two different sized nanoparticles at the interface. The dynamics of the nanoparticles at the fluid interface, probed using fluorescence photobleaching methods, suggests a liquid-like behavior. The results have implications in the design of hierarchical self-assemblies of nanoparticles for the one-step fabrication of devices on multiple length scales. Nanoparticle Assembly at Fluid Interfaces: Structure and Dynamics Y Lin A Boker H Skaff D Cookson AD Dinsmore T Emrick TP Russell doi:10.1021/la048000q Langmuir, Vol. 21, No. 1. (4 January 2005), pp. 191-194. 2008-04-29T22:19:44-00:00 2005 Langmuir 21 1 191 194 dinsmore emulsion interface nano http://www.citeulike.org/user/dchen/article/2453697 <i>Physical Review Letters, Vol. 81, No. 7. (1998), 1461.</i><br /><br />Using noncontact scanning probe microscopy techniques; dielectric properties were studied on 50 nm length scales in polyvinyl-acetate films in the vicinity of the glass transition. Low frequency (1/ f ) noise observed in the measurements was shown to arise from thermal fluctuations of the electric polarization. Anomalous variations observed in the noise spectrum provide direct evidence for cooperative nanoregions with heterogeneous kinetics. The cooperative length scale was determined. Heterogeneity was long lived only well below the glass transition for faster than average processes. Nanometer Scale Dielectric Fluctuations at the Glass Transition Vidal Russell NE Israeloff LE Walther Alvarez doi:10.1103/PhysRevLett.81.1461 Physical Review Letters, Vol. 81, No. 7. (1998), 1461. 2008-03-01T20:27:48-00:00 1998 Physical Review Letters 81 7 1461 American Physical Society glass systemtools transition