Highlights
Mar 15, 2013
University of Chicago
Two views of how Information is transmitted through a material
Jelena Pesic, Joseph Zsolt Terdik, Xinliang Xu, Yi Tian, Alejandro Lopez, Stuart A. Rice, Aaron R. Dinner, and Norbert F. Scherer [University of Chicago]
In our system, a colloidal particle (upper left (a), red) is trapped by optical tweezers (upper left (b)) as a surrounding colloidal suspension flows past. Surprisingly, long range order develops in the particle density (lower left, dark bands are regions with over-representation of particles, sigma is the particle diameter). A novel analysis of particle motions using a technique from computer science reveals the otherwise hidden flow patterns in the fluid surrounding the probe (right).
Mar 15, 2013
University of Chicago
Self-Assembled Nano-Drums
Pongsakorn Kanjanaboos (University of Chicago), Xiao-Min Lin (Argonne), John E. Sader (University of Melbourne), Sara Rupich (University of Chicago), Heinrich M. Jaeger (University of Chicago), Jeffrey R. Guest (Argonne)
Using the expertise in nanoparticle synthesis and assembly built up in IRG 3, a MRSEC team comprised of members of the Jaeger and Talapin groups collaborated with Xiao-Min Lin and Jeffrey Guest at Argonne’s Center for Nanoscale Materials and John Sader from the University of Melbourne to develop the first completely self-assembled nano-mechanical resonator. It forms when a nanoparticle monolayer drapes itself over a hole several microns in diameter to produce a 10nm thin, freestanding membrane that vibrates in the MHz range (transmission electron microscope images shown in left inset).
Mar 15, 2013
University of Nebraska - Lincoln
Mechanical Writing of Polarization
Haidong Lu and Alexei Gruverman (Nebraska MRSEC)
Ferroelectrics comprise an important group of
materials, which are characterized by a permanent electric polarization. This
polarization can be switched which provides a possibility of using
ferroelectrics in data storage and memory devices. Typically, polarization is
switched by the application of the external electric field. Nebraska MRSEC researchers
have shown that polarization can be switched by purely mechanical means: simply
by pushing the tip of a scanning probe microscope against the ferroelectric
Mar 15, 2013
University of Nebraska - Lincoln
Nebraska MRSEC Professor/Student Pairs Program
Shireen Adenwalla (Nebraska MRSEC)
The Nebraska MRSEC Professor/Student Pairs Program brings in a professor and a student from non-research intensive four-year institutions to conduct research with Nebraska MRSEC scientists. The goal is to offer a research experience which benefits both the participants and the MRSEC projects.
Mar 11, 2013
Cornell University
Ordering Nanoscale Dots with Molecular Honeycombs
Designable Porous Organic Networks Represent A New Strategy for Nanoparticle Assembly
Mar 11, 2013
Cornell University
Launching Student Interest in Science
Scientists design experiments to increase excitement K-12 science education
Feb 28, 2013
University of Pennsylvania
A Lipid-Clustering Mechanism to Trigger Actin Assembly in Cell Extracts
Paul A. Janmey and Dennis Discher, University of Pennsylvania
Filaments in the
cytoplasm that constitute a three dimensional cytoskeleton are formed by
polymerization of the protein actin, which is initiated at distinct sites near the cell
membrane. Negatively charged lipids in
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
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