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Highlights

Highlights

Jan 27, 2014
Cornell University

Atomic Break Dancing in the World’s Thinnest Glass

P. Y. Huang, S. Kurasch, J. S. Alden, A. Shekhawat, A. A. Alemi, P. L. McEuen, J. P. Sethna, U. Kaiser, D. A. Muller, Science 342, 224-227 (2013)
Electron microscopy reveals the fundamental steps of bending An international team of Cornell researchers and collaborators was recently entered into the Guinness Book of World Records for fabricating the world’s thinnest pane of glass — only two atoms thick!
Cavitation in Block Copolymer Modified Epoxy Revealed by In Situ Small-Angle X-Ray Scattering
Cavitation in Block Copolymer Modified Epoxy Revealed by In Situ Small-Angle X-Ray Scattering
Jan 22, 2014
University of Minnesota - Twin Cities

Cavitation in Block Copolymer Modified Epoxy Revealed by In Situ Small-Angle X-Ray Scattering

Frank Bates & Lorraine Francis (IRG-1)
Addition of rubber particles to epoxy thermosets has been successful for toughening these brittle materials.
Intramolecular Exciton Transport in Conjugated Polymers
Intramolecular Exciton Transport in Conjugated Polymers
Jan 22, 2014
University of Minnesota - Twin Cities

Intramolecular Exciton Transport in Conjugated Polymers

David Blank (IRG-2)
Using a series of acceptor-polymer-acceptor triads, IRG-2 investigators have measured intramolecular exciton diffusion in poly-3(hexylthiophene) (P3HT) for the first time.
Magnetic Charge Crystallization in Artificial Spin Ice
Magnetic Charge Crystallization in Artificial Spin Ice
Jan 22, 2014
University of Minnesota - Twin Cities

Magnetic Charge Crystallization in Artificial Spin Ice

Chris Leighton (IRG-3), in collaboration with the Univ. of Illinois, Penn State, and Los Alamos
“Artificial spin ice” is a term used for arrays of nanoscale magnetic islands on lattices that geometrically frustrate inter-island interactions. 
(Wheeler et al., Nat. Commun.,4, 2197, 2013)
(Wheeler et al., Nat. Commun.,4, 2197, 2013)
Jan 22, 2014
University of Minnesota - Twin Cities

Ligand-free Colloids and Surface Doping of Silicon Nanocrystals

Uwe Kortshagen 
Inks of inorganic nanocrystals hold great promise for printed electronics but the widely used organic surfactants (ligands) needed to stabilize these inks degrade the electrical quality of the printed films.
(a) The non-local resistance anomaly observed in Fe/Cu spin valves (red points), in which the polarization of the current decreases with decreasing temperature. The effect does not occur in Fe/Al (blue)or in Fe/Cu devices with Al interlayers. (b) The effect is due to the formation of a screening cloud around local moments (the Kondo effect). The effect saturates at low temperature, but the polarization of the current is reduced below its ideal value.
(a) The non-local resistance anomaly observed in Fe/Cu spin valves (red points), in which the polarization of the current decreases with decreasing temperature. The effect does not occur in Fe/Al (blue)or in Fe/Cu devices with Al interlayers. (b) The effect is due to the formation of a screening cloud around local moments (the Kondo effect). The effect saturates at low temperature, but the polarization of the current is reduced below its ideal value.
Jan 22, 2014
University of Minnesota - Twin Cities

Kondo Physics at Ferromagnet/Normal Metal Interfaces

P. A. Crowell and C. Leighton
The idealized picture of an interface between two elemental materials is simply an abrupt transition between planes containing two different types of atoms.
Jan 19, 2014
Northwestern University

Enhanced Refractive Index Sensing with Monodisperse Faceted Plasmonic Nanoparticles

Yu Jin Shin, Emilie Ringe, Michelle L. Personick, M. Fernanda Cardinal, Chad A. Mirkin, Laurence D. Marks, Richard P. Van Duyne, and Mark C. Hersam
The shape-dependent optical properties of metal nanostructures have motivated efforts to correlate nanoparticle structure with plasmonic behavior. In particular, gold bipyramids (BPs) are of interest due to their sharp tips that lead to strong localized field enhancement and high sensitivity to the surrounding environment. However, despite their potential, relatively few reports have studied the optical properties of sub-100 nm BPs due to their relatively low synthetic yields. To overcome this issue, density
Jan 19, 2014
Northwestern University

Northwestern MRSEC Partnerships Nucleate New Centers

Northwestern MRSEC provides the physical and intellectual infrastructure to nucleate collaborative opportunities in materials research both on and off the Northwestern campus, and continues to leverage its diverse portfolio of research into new educational and commercial opportunities. Recent examples include:
Dec 5, 2013
University of Utah

Utah MRSEC Teaching the Teachers

Debra Mascaro, Utah MRSEC, University of Utah Mechanical Engineering.
Teaching the Teachers Electromagnetism at the Physical Sciences Inquiry Academy These fifth-grade teachers are building electromagnetic ping pong ball launchers to demonstrate electromagnetism to their students. Utah MRSEC leads lessons and activities for teachers, as well as provides educational kits which supplement curriculum andcoordinate with Utah Core Standards. Participants:
Dec 5, 2013
University of Utah

Graphene-Insulator-Graphene Active THz Devices

Berardi Sensale-Rodriguez, Department of Electrical and Computer Engineering, The University of Utah, Salt Lake City, Utah 84112, USA
Discovery: Graphene-based plasmonic structures composed of graphene-insulator-graphene can provide gain at THz frequencies due to interplay between plasmons and resonant-tunneling.

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