Highlights
Feb 28, 2013
University of Pennsylvania
Particle Shape Affects Membrane Bending & Drop Drying
T. C. Lubensky and A. G. Yodh, University of Pennsylvania
Novel, cylindrical, ribbon-like
membranes are formed when colloidal particles adsorb at the air-water
interfaces of droplets confined between two glass plates (Fig. a). We have found that the ease with
which such ribbon membranes bend depends on particle shape. Ellipsoidal
particles on the interface locally deform the interface and thereby introduce
strong capillary forces into the membrane that couple the particles into
networks. The resultant membrane scaffolding can resist bending by as much as
Feb 28, 2013
University of Pennsylvania
Tunable Tensile Ductility in Metallic Glasses
D.J. Magagnosc(1), R. Erhbar(1), G. Kumar(2), M.R. He(1), J. Schroers(3), D.S. Gianola(1) 1, University of Pennsylvania; 2, Texas Tech. University; 3, Yale University
Metallic glasses
(MGs) are an exciting class of materials due to a suite of attractive
properties including high strength, large stretchability, high wear and corrosion resistance,
and excellent magnetic properties. However, adoption of MG in many applications
has been hindered by the fact that they are brittle: they can break apart very
suddenly, especially when put under tension. Ductility – the ability to softly
stretch without breaking – would be a better property to have.
Feb 28, 2013
University of Pennsylvania
Topological Semimetal in Tensile Strained HgTe
C.L. Kane, E.J. Mele and A.M. Rappe, University of Pennsylvania
In the past few years, the theory of
topological band structures has been generalized beyond topological insulators
to include topological semimetals, including Weyl
semimetals, Dirac semimetals and other “symmetry protected” topological
states. HgTe is a
semimetal in which the degeneracy of the conduction and valence band at the G point is
protected by symmetry. In their early
work on topological insulators, Fu and Kane showed that straining HgTe opens a
gap at G,
resulting in a topological insulator.
Feb 20, 2013
Northwestern University
Thermal Stability of Amorphous Zn-In-Sn-O Films Diana
Diana E. Proffit1, Thomas Philippe1, Jonathan D. Emery1, Qing Ma2, D. Bruce Buchholz1, Peter W. Voorhees1, Michael J. Bedzyk1, Robert P.H. Chang1, Thomas O. Mason1
Diana E. Proffit1, Thomas Philippe1, Jonathan D. Emery1, Qing Ma2, D. Bruce Buchholz1, Peter W. Voorhees1, Michael J. Bedzyk1, Robert P.H. Chang1, Thomas O. Mason1
1Northwestern University Materials Research Science & Engineering Center2DND-CAT, Northwestern Synchrotron Research Center at Advanced Photon
Feb 20, 2013
Northwestern University
A Range of Amorphous Structures
D.B. Buchholz, L. Zeng, M.J. Bedzyk and R.P.H. Chang
A range of amorphous structures for a single
chemical-composition material (Indium Oxide)
were observed; the structure dependent on
the growth conditions.
The carrier mobility and film (not carrier)
density of the films was dependent on growth
temperature.
Films grown at 0°C and below are amorphous
The film density decreased from 7.0 g/cm3
at 0°C to 5.4 g/cm3 at -100°C; the carrier
mobility decrease from ~57 cm2/V•s to ~20
cm2/V•s over this same temperature range.
The peak in mobility at 0°C adds to the body
Feb 20, 2013
Northwestern University
High Performance Carbon Nanotube Thin-Film Transistors Enabled by Hybrid Molecular Dielectrics
Vinod K. Sangwan, Rocio Ponce Ortiz, Justice M. P. Alaboson, Jonathan D. Emery, Michael J. Bedzyk, Lincoln J. Lauhon, Tobin J. Marks, and Mark C. Hersam
Over the past decade, semiconducting carbon
nanotube (CNT) thin films have been recognized as
contending materials for a wide range of applications
in electronics, energy, and sensing. Nevertheless,
CNT transistor performance suitable for real-world
applications awaits understanding-based progress in
the integration of independently pioneered device
components. We achieve this here by integrating
high-purity semiconducting CNT films with a customdesigned
hybrid inorganic-organic gate dielectric.
Jan 30, 2013
Triangle Small Angle X-Ray Scattering Facility
In an
effort, spearheaded by Triangle MRSEC, we received support through the NSF-MRI program
for the purchase of Small Angle X-Ray Scattering (SAXS) instrumentation.
The state-of-the-art instruments will serve the greater Research Triangle
community for
research and education, and will be housed in Duke's Shared Materials
Instrumentation Facility (SMIF).
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