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Graphene (two-dimensional carbon) is an attractive material for spintronics due to weak spin-orbit coupling for robust spin transport properties. This could lead to spin-based computers that integrate logic and memory for much greater computing power.

Magnetism is typically associated with “transition metal” elements such as nickel or iron, from the middle of the periodic table.  These elements contain d electrons which are localized on the atoms, and have a “spin” or magnetic moment.  Carbon contains no d electrons and is not normally magnetic. 

When cells assemble together in a cluster, they apply force to each other. The way in which cells signal each other with and respond to forces is not well understood. Therefore, we study the traction forces cells apply to the substrate beneath them. The results show exterior cells apply tractions to the substrate that are an order of

A group of MRSEC researchers, staff, and graduate students visited the Boston Museum of Science on July 15, 2009 for a day of public demonstrations and presentations to encourage thought and discussion about polymers. The Ventures in Science Using Art Laboratory (VISUAL) program had an ongoing exhibit of images at the Museum from May through August, and coordinated a presentation to teach the audience about materials and capture their attention using visually striking images gathered during the course of MRSEC research at UMass.

Dinsmore at the UMass Materials Research Science and Engineering Center demonstrated a simple and robust approach to fabricating nano-scale electrical contacts to nanoparticles. PEGfunctionalized nanoparticles assemble spontaneously on droplets of liquid metal; when two droplets are brought into contact, they remain separated by the nanoparticles at the interface (top figure). Junctions formed by this method show electron transport that is limited by the nanoparticles (bottom figure). The conductance can be tuned by a gate electrode to make transistors at the micronscale.

Picoprojection is the latest advanced display technology enabled by ferroelectric liquid crystal on silicon microdisplays, developed by LCMRC spin-off company, industrial partner, and collaborator Displaytech, now a division of Micron, Inc.. LCMRC researchers pursue new liquid crystal materials and alignment systems enabling low power consumption bistable liquid crystal switching.

A designer protein combining ZnS mineralizing activity with IgG adaptor capability was built and used for easy and rapid aqueous synthesis of immuno-QDs. The particles consist of a ≈ 4 nm ZnS wurtzite core, can be derivatized with a wide variety of unmodified antibodies, and have ultrasmall (14 nm) diameters.

Expanding outreach with portable SEM for K-12 math/science. Last year MRSEC graduate students at the University of Arkansas brought cutting edge microscopy to local middle-school students and allow them to explore the world of nanoscience in real-time.   This year our focus expanded to regional high-school students. The microscope is a portable scanning electron microscope (SEM).   The SEM allows the students to explore the world of the “nano”.

  We have made the first experimental observation of the Aharonov-Bohm effect in neutral excitons. In classical mechanics the motion of an electrical charged particle is only affected if the particle enters a region of space with a magnetic or electric field.