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Program Highlights for year 2013

Organic topological insulators in organometallic Lattices

Discovery: A class of 2D covalent organic framework made of triphenyl- metal compounds are found to be topological insulators exhibiting robust nontrivial topological edge states.

Approach: Predictive First-principles band structure and band topology calculations.

Two views of how Information is transmitted through a material

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).

Self-Assembled Nano-Drums

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.

Mechanical Writing of Polarization

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

Nebraska MRSEC Professor/Student Pairs Program

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.

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).

First Observation of Hall Effect in Polymer Transistors

Printed transistors employing both the bench-mark polymer semiconductor poly(3-hexyl-thiophene) and ultra-high capacitance ion gel gate insulators exhibit unusually large hole mobilities near 1 cm2/Vs at high charge densities (0.2 holes/ring).

SAPs: Self Assembled Peptides

Developed in GEMSEC, biocombinatorially selected solid binding peptides with short (7-15) amino acid (AA) sequences can bind to atomically flat materials via molecular recognition that leads to surface diffusion, clustering and long-range ordered assembly commensurate with the underlying crystallographic solid lattice.

Molecular Biomimetics

Molecular Biomimetics - Making materials one molecule at a time, via the Biology’s ways, allows an intricate control of nano- and microstructures that permit tailoring functional properties towards practical applicati

First All-Gas Phase Manufacture of a Nanocrystal Based Electronic Device

Semiconductor nanocrystals hold great potential for the low-cost manufacture of electronic devices.