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Highlights

Highlights

Fig. 1 (left) Schematic of a Janus droplet with two phase-separated compartments: polymer (top) and LC (bottom). (others) Bright-field images of LC Janus droplets with different polymer:LC volume ratios and background surfactant.
Fig. 1 (left) Schematic of a Janus droplet with two phase-separated compartments: polymer (top) and LC (bottom). (others) Bright-field images of LC Janus droplets with different polymer:LC volume ratios and background surfactant.
May 25, 2016
University of Pennsylvania

Liquid Crystal Janus Droplets

D. Lee, P. Collings, & A. G. Yodh (IRG-1)
Janus colloids are composed of two-faced particles with distinctive surfaces and/or compartments. Lee, Collings, & Yodh have created the first Janus particles with a liquid crystal (LC) compartment. The droplets were prepared by combining microfluidic and phase separation techniques, and the LC compartment morphologies can be easily controlled to realize unique confining geometries (Fig. 1).
Colloidal nanocrystal inks of metallic silver, semiconducting cadmium selenide, and insulating aluminum oxide nanocrystals are used to construct the high conductivity electrodes, high mobility semiconductor channel layers, and high dielectric constant insulator layers of transistors. Colloidal indium nanocrystals are mixed into the silver nanocrystal inks to dope the semiconductor channel upon annealing. High mobility, all nanocrystal devices operating at low voltage are fabricated by solution-based methods over a large area on flexible plastics.
Colloidal nanocrystal inks of metallic silver, semiconducting cadmium selenide, and insulating aluminum oxide nanocrystals are used to construct the high conductivity electrodes, high mobility semiconductor channel layers, and high dielectric constant insulator layers of transistors. Colloidal indium nanocrystals are mixed into the silver nanocrystal inks to dope the semiconductor channel upon annealing. High mobility, all nanocrystal devices operating at low voltage are fabricated by solution-based methods over a large area on flexible plastics.
May 25, 2016
University of Pennsylvania

All Nanocrystal Electronics

C.B. Murray & C.R. Kagan (IRG-4)
Synthetic methods produce colloidal nanocrystals that are metallic, semiconducting, and insulating. These nanocrystals have been typically used to form only a single component in devices. IRG-4 has exploited the library of colloidal nanocrystals and designed the materials, surfaces, and interfaces to construct all the components of field-effect transistors.The transistors are fabricated from solution over large areas and on flexible plastics and have excellent electrical performance.   This work was published in  Science, 352, 205-208 (2016).
Cross section of a thin film of BaTiO3 on Ge imaged using transmission electron microscopy.
Cross section of a thin film of BaTiO3 on Ge imaged using transmission electron microscopy.
May 25, 2016
Yale University

Revealing Hidden Phases in Materials

Ismail-Beigi, Ahn, and Walker  
Strong interactions at the interface between a crystalline film and substrate can impart new structure to thin films. Here, a germanium surface (purple atoms) squeezes a BaTiO3 thin film above, revealing a hidden phase not seen in the bulk. The hidden phase of BaTiO3 shows oxygen octahedra cages (shaded in aqua) alternating in size. By combining theory, synchrotron x-ray diffraction, and electron microscopy, a new materials design approach has uncovered hidden traits of a material that can be expressed through articulated forces at an interface.
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May 25, 2016
Yale University

Electrocatalytic Surfaces Using Bulk Metallic Glass Nanostructures

Osuji, Schroers, and Taylor
Metallic glass nanostructures provide a new platform for electrocatalytic applications. Several surface modification strategies that remove or add metal species (top images) improve the catalytic activity of metallic glass nanostructures. These strategies were demonstrated for three key electrocatalytic reactions important for renewable energy.
May 18, 2016
University of Utah

Leveraging MRSEC Equipment Purchases

Ian R. Harvey, Shared Facilities Director, Utah MRSEC, University of Utah
Leveraged upgrades to Scanning Transmission Electron Microscope (S/TEM) and Focused Ion Beam System (FIB):
May 18, 2016
University of Utah

Modeling the UV Electromagnetic Response of Al and Mg Plasmonic Nanostructures

Steve Blair, Department of Computer and Electric Engineering, University of Utah Sivaraman Guruswamy, Department of Metallurgical Engineering, University of Utah
Objective: Compare the UV plasmonic response of Al and Mg nanostructures. Light transmission through sub-wavelength aperture arrays shows significant
MRSEC Shared Facilities: A Vital Resource
MRSEC Shared Facilities: A Vital Resource
May 13, 2016
University of Wisconsin - Madison

MRSEC Shared Facilities: A Vital Resource

Jerry Hunter, University of Wisconsin-Madison
The resources of the Wisconsin MRSEC Shared Facilities impact researchers campus-wide and beyond. Over the past year >79,000 usage hours accounted for:
Assistant Director of Education, Ben Taylor, leads materials science activities with a student at the St. Vincent de Paul Society food pantry in Madison, Wisconsin.
Assistant Director of Education, Ben Taylor, leads materials science activities with a student at the St. Vincent de Paul Society food pantry in Madison, Wisconsin.
May 13, 2016
University of Wisconsin - Madison

Wisconsin MRSEC Outreach Impacts 255,000 People This Year!

Anne Lynn Gillian-Daniel, Benjamin Taylor University of Wisconsin-Madison
Since 2011, the Wisconsin MRSEC has created over 40 unique research-inspired education resources. These resources are disseminated through educational kits, outreach activities, instructional videos and other online resources, all based on cutting-edge research going on in the Wisconsin MRSEC. These resources have impacted: >650,000 people in 194 countries. Over the last year:
Templating Nanomaterials from Defects in Liquid Crystals
Templating Nanomaterials from Defects in Liquid Crystals
May 13, 2016
University of Wisconsin - Madison

Templating Nanomaterials from Defects in Liquid Crystals

Nicholas L. Abbott, Juan J. de Pablo*, University of Wisconsin-Madison, *University of Chicago
Defects in liquid crystals can function as nanoscopic molds for assembling molecules
New semiconductor alloys have been developed that have band gap tunability allowing materials to be tailor-made to the application despite the limits imposed by nature. One such alloy is GaAs(1-x-y)P(x)Sb(y) with wide bandgap tunability.
New semiconductor alloys have been developed that have band gap tunability allowing materials to be tailor-made to the application despite the limits imposed by nature. One such alloy is GaAs(1-x-y)P(x)Sb(y) with wide bandgap tunability.
May 13, 2016
University of Wisconsin - Madison

Expanding the Palette of Useful Semiconductors

Thomas F. Kuech, Susan E. Babcock, April Brown*, Maria Losurdo**, University of Wisconsin-Madison, *Duke University, **CNR-NANOTEC
Designing materials nature never intended

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