Highlights
Mar 11, 2011
University of Massachusetts Amherst
Mesoscopically Helical Order in Chiral Block Copolymers
Supermolecular, helical assemblies are a common structural motif
exploited in far-ranging biological contexts, from the flagellar appendages of
swimming microorganisms to the protein coats that sheath rod-like viruses. The screw-like structure of these
Mar 9, 2011
Colorado School of Mines
K-12 Outreach
Jennifer Strong, Linda Lung (NREL) and Barbara Moskal; Renewable Energy MRSEC, NSF DMR-0820518
The Renewable Energy MRSEC and the Adams and Meeker County Public Schools are collaborating on several partnership programs, the Bechtel K-5 Educational Excellence Initiative, the NSF funded GK-12 Learning Partnership, and the ExxonMobil Meeker Partnership. In these partnerships, CSM graduate students in mathematics, science and engineering are placed in support of elementary and middle school teachers and their students for up to fifteen hours each week throughout the academic year.
Mar 7, 2011
Colorado School of Mines
Storing Hydrogen in Novel Clathrate Materials
T. Sugahara, S. Sachdeva, D. Baker, J. Haag, M. Braniff, J. Difulvio, D. Rainey, C. A. Koh, A. M. Herring, A. K. Sum, P. C. Taylor, A. Dillon, K. O’Neill; Renewable Energy MRSEC, NSF DMR-0820518
Clathrate materials present a novel class of storage media for hydrogen. These unusual crystalline solids are comprised of a lattice of polyhedral cavities that can trap a range of different guest molecules, including hydrogen. We have successfully demonstrated that hydrogen molecules can occupy large cages of clathrate hydrates at higher pressures, covalently bonded silicon clathrate cages, and hydroquinone clathrates. Computer simulations have revealed the mechanisms of clathrate hydrate formation.
Mar 7, 2011
Colorado School of Mines
Metal Free Silicon Nanowires
Somilkumar Rathi, Joe Beach, Paul Stradins, Craig Taylor, and Reuben Collins; Renewable Energy MRSEC, NSF DMR-0820518
Silicon nanowires are potentially transformative photovoltaic materials. Nanowire arrays are commonly synthesized using metal seeds. The growth process often introduces metal impurities into wires which degrade their electronic properties. We have used a plasma-assisted, vapor-liquid-solid process to grow silicon nanowires using tin seeds. The tin is etched by the hydrogen plasma while the wires grow, resulting in self terminating wires which are metal free.
Mar 7, 2011
Colorado School of Mines
Novel thin flexible hybrid inorganic/polymer films
Daniel Knauss and Andrew Herring, Renewable Energy MRSEC, NSF DMR-0820518
We have demonstrated the first ever hybrid polymer film of an insoluble polymer with an acid (top picture).
Jan 26, 2011
University of Minnesota - Twin Cities
Printed, Flexible Carbon Nanotube Digital Circuits
Dan Frisbie
Graduate student Mingjing Ha working with Optomec, Inc. and Northwestern University collaborators (Mark Hersam) has demonstrated low voltage, fast carbon nanotube (CNT) circuits printed on flexible plastic substrates. The circuits are fabricated by aerosol jet printing from a liquid dielectric ink (ion gel) and a purified semiconducting CNT ink (Northwestern). The printed semiconducting CNTs form the channels in thin film transistors and printed circuits.
Jan 12, 2011
University of Minnesota - Twin Cities
ZnO Nanowires for DNA Electrophoresis
Kevin Dorfman, Eray Aydil
Our team has developed a simple solution-based method to fabricate arrays of ZnO nanowires inside of a glass microchannel.
Jan 12, 2011
University of Minnesota - Twin Cities
Discovery of a Frank-Kasper σ Phase in Sphere-Forming Block Copolymer Melts
Frank Bates
Ordering of spherical particles represents a fundamental topic in materials science and engineering ranging from the sub-nanometer scale packing of atoms in simple crystals to micron sized assemblies of colloids.
Jan 11, 2011
Cornell University
Graphene Grains make Atomic Patchwork Quilts
P. Y. Huang et al., Nature (Published Online 5 Jan 2011)
Stitching defects make the film weaker, but have no electronic effect
Dec 20, 2010
New York University
Pleats on Crystals on Curved Surfaces
W.T.M. Irvine, V. Vitteli, P. M. Chaikin
Electrically charged polymer colloids attracted to the surface of water droplets of different shapes crystallize on their curved surfaces.
The curvature frustrates perfect crystallization and defects must be added such as the familiar twelve pentagons which decorate the otherwise hexagonal faces of a soccer ball. The pentagons/disclinations strongly relax curvature.
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