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Program Highlights for year 2011

Colloidal Networks & Lattices at Threshold of Mechanical Stability

An isostatic lattice is one at the threshold of mechanical stability. The square and kagome lattices (see Figure 1a-b) in two dimensions are examples of isostatic lattices. A 2D kagome lattice of N sites has of order N1/2 zero-energy bulk modes under periodic boundary conditions. Theoretical study shows that when neighboring triangles are counter

High School Student Research Internships at The Johns Hopkins University

Background: The JHU MRSEC conducts extensive K-12 educational outreach programs aimed at promoting interest in and awareness of the importance of modern materials

Dynamics of Magnetic Charges in Spin Ice

Background: A bar magnet has two poles, denoted as +1 and -1 magnetic charges.  Patterned structures consist of many magnets (Fig. 1), where the square array (Fig. 1a) does not, whereas the honeycomb (Fig. 1b) has, net magnetic charges (or magnetic monopoles).  Under a magnetic field these local magnetic monopoles will move (Fig. 1c). 

Control of Tetrahedral Coordination in FeSe Superconductors

Background: The tetrahedral coordination of Fe surrounded by 4 Se(Te) atoms is of crucial importance for the new high TC Fe pnictides superconductors with lattice parameters c and a. To

The Material World

A weeklong materials science workshop series with morning lectures followed by hands-on lab exercises to reinforce concepts for introduction of materials-related content into core science curricula at the home institution Organized and taught by MRSEC faculty investigators Partnership with the Faculty Resource Network at NYU,

Effective Defects: Strength in Numbers. The surprising strength of highly defective graphene

Graphene in its pristine form is one of the strongest materials, but defects influence its strenth.  Using atomistic calculations, we find that, counter to standard reasoning, graphene sheets with large-angle tilt boundaries that have a high density of defects are as strong as the pristine material and unexpectedly are much stronger than those with low-angle boundaries having fewer defects.  We

Computer-aided design of lightweight allows for future vehicles

Replacing steel with lightweight Aluminum alloys could significantly improve fuel economy of vehicles.  Existing lightweight alloys are difficult to use, because they have poor ductility, and tend to tear while they are stamped to form a complex part.  Adding small quantities of additional allying elements to lightweight alloys could improve their ductility.  But at present the only way to iden

Protein-Driven Synthesis of Transition Metal-Doped ZnS Immuno-Quantum Dots

Doping semiconductor nanocrystals with transition metals is an efficient route to tune emission color over a broad range of