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Researchers at the University of Texas - Austin find that manipulating biological electron transport pathways may be a general strategy for allowing bacteria to produce or communicate with synthetic materials.

The presence of isolated defects in the lattice of large band-gap semiconductors can introduce colored centers, by altering their electronic properties giving rise to transitions within the visible region.  Diamond has a rigid and dense lattice preventing defect diffusion and phase transitions under high pressure and temperature settings.

Ferromagnetism in monolayer van der Waals materials (vdW) has recently drawn tremendous attention since they were first discovered last year. Most of the materials found, however, are semiconductors and extremely air sensitive, so a vdW material that is metallic and stable under ambient conditions is highly desirable.

Information stored in magnetic materials is often read-out by measuring changes in magnetoresistance. Large magnetoresistance effects are thus important for establishing well-defined memory states within materials that store information. The Illinois MRSEC discovered a new and large magnetoresistance effect generated when a topological insulator (TI) is placed on top of an ordinary magnetic insulator. The surface of the TI becomes magnetic and exhibits a  so-called surface-state anisotropic magnetoresistance. This effect is two-orders of magnitude larger than previous effects induced in similar materials.

NYU-MRSEC investigators along with research scientist from the BioBus/BioBase organization mentored nine high school students as part of a two month peer-mentorship program.  The idea, to train high school students in optics, CAD/3D printing and basic of microscopy including applications in materials science (crystals and colloids).

One of the main drawbacks of metallic glasses is their low thermodynamic stability, which limits their formability and service life.  Recently, experiments by members of the Wisconsin MRSEC showed that organic glasses with high thermodynamic stability can be synthesized via physical vapor deposition (PVD) onto a substrate at a controlled temperature.  Now, this team of researchers has used molecular dynamics simulations to predict that the same PVD methods can enhance the stability of metallic glasses. 

The ability to precisely predict how molecular structure influences the microstructure of polymeric materials is the key towards the custom tailoring of desirable materials properties. Molecular dynamics simulations with atomistic level models were performed to design “high-χ” block oligomers that can self-assemble into 1-5 nm domains for next generation microelectronics applications. Simulations show that the microstructures formed by these oligomers can be tuned by varying the molecular weight and the chain architecture.

The Materials and Manufacturing Summer Teachers’ Institute is a school-to-career initiative that targets STEM skills instruction for grades 7-12 in the New Haven and Bridgeport Public Schools. Three-day workshop designed to:

Metallic glass resonators can possess larger quality factors (i.e., slower rates of energy dissipation) than typical polycrystalline metals, since metallic glasses are spatially homogeneous without dislocations and other topological defects. Using numerical simulations, we studied the energy dissipation mechanisms and  measured the quality factor Q in model metallic glass cantilevers (panel (a)). We bend the cantilever to a given strain ε, release it, and measure Q from the Fourier transform of the cantilever displacement as a function of time.

Atomically thin two-dimensional (2D) materials exhibit superlative properties dictated by their intralayer atomic structure, which is typically derived from a limited number of thermodynamically stable bulk layered crystals (e.g., graphene from graphite). The growth of entirely synthetic 2D crystals – those with no corresponding bulk allotrope – would circumvent this dependence upon bulk thermodynamics and substantially expand the phase space available for structure-property engineering of 2D materials.