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Highlights

Highlights

Inexpensive Polymer Films for Efficient Daytime Radiative Cooling
Inexpensive Polymer Films for Efficient Daytime Radiative Cooling
Jun 14, 2017
CU Boulder Soft Materials Research Center (2014)

Inexpensive Polymer Films for Efficient Daytime Radiative Cooling

Xiaobo Yin & Ronggui Yang, University of  Colorado Boulder
Researchers at the University of Colorado Boulder have made a discovery that explores an inexpensive way to eliminate waste heat in buildings, cooling systems, and even cars and trucks.
MRSEC researchers teach the public about metallic glasses (top left), light emitting diodes (bottom left), and carbon nanomaterials (center right).
MRSEC researchers teach the public about metallic glasses (top left), light emitting diodes (bottom left), and carbon nanomaterials (center right).
Jun 13, 2017
Wisconsin Materials Research Science and Engineering Center

MRSEC Members Teach the Public about Materials Science during the Wisconsin Science Festival

Anne Lynn Gillian-Daniel, University of Wisconsin-Madison
Over the course of two days, the Wisconsin MRSEC presented exciting hands-on, research-inspired  materials science activities to over 1500 people during the 2016 Wisconsin Science Festival.  The 2016 Wisconsin Science Festival was the largest ever with over 250 events in 20 communities across Wisconsin.
Researchers at University of Wisconsin-Madison have discovered that it is possible to transform spherical polymer shells into non-spherical shapes by partially filling their interiors with oils. The polymer shells can be strained into a remarkable range of shapes with six-, five-, four- and three-fold symmetries (see figure), and then polymerized to create non-spherical particles.
Researchers at University of Wisconsin-Madison have discovered that it is possible to transform spherical polymer shells into non-spherical shapes by partially filling their interiors with oils. The polymer shells can be strained into a remarkable range of shapes with six-, five-, four- and three-fold symmetries (see figure), and then polymerized to create non-spherical particles.
Jun 13, 2017
Wisconsin Materials Research Science and Engineering Center

Synthesis of Non-Spherical Particles using Partially-Filled Polymeric Shells

N. L. Abbott, D. M. Lynn; University of Wisconsin-Madison
Spherical particles are easy to synthesize because a sphere is a shape that minimizes surface area. Non-spherical particles, however, have properties that can be very different from spherical particles, but they are challenging to fabricate.
Radiation-hard graphene transistors are enabled by integration with hybrid Zr-SAND.
Radiation-hard graphene transistors are enabled by integration with hybrid Zr-SAND.
Jun 13, 2017
Northwestern Materials Research Science and Engineering Center

Radiation-Hard Graphene Electronic Devices via Hybrid Dielectrics

Mark Hersam and Tobin Marks, Northwestern University MRSEC
Solution-processed semiconductor and dielectric materials are attractive for satellite technology due to their light-weight, low-voltage operation, and mechanical robustness, but their response to ionizing radiation environments is not well understood.
Atomic force microscope images (left), schematic (center), and photograph (top right) of a film with layers of graphene oxide, semiconducting single-walled carbon nanotubes, and graphene. This combination allows silicon to drive oxygen evolution (bubbles in photograph) by protecting the silicon and more efficiently extracting charge carriers (holes).
Atomic force microscope images (left), schematic (center), and photograph (top right) of a film with layers of graphene oxide, semiconducting single-walled carbon nanotubes, and graphene. This combination allows silicon to drive oxygen evolution (bubbles in photograph) by protecting the silicon and more efficiently extracting charge carriers (holes).
Jun 13, 2017
Northwestern Materials Research Science and Engineering Center

Metal-Free Carbon-Based Nanomaterial Coatings Protect Silicon Photoanodes in Solar Water-Splitting
Solar water splitting converts solar energy into chemical fuels that can be easily stored and transported. Silicon is already used on a large scale for photovoltaics, but it is unstable in the electrolytes used for water oxidation.
Four-dimensional parameter space of In-based AOSs derived based on integrated experimental and theoretical studies: (1) deposition temperature (or quench rates); (2) oxygen stoichiometry; (3) metal composition; and (4) lattice strain.
Four-dimensional parameter space of In-based AOSs derived based on integrated experimental and theoretical studies: (1) deposition temperature (or quench rates); (2) oxygen stoichiometry; (3) metal composition; and (4) lattice strain.
Jun 13, 2017
Northwestern Materials Research Science and Engineering Center

Parameter Space for Amorphous Oxide Semiconductors (AOSs)

Julia Medvedeva and Robert Chang, Northwestern University MRSEC
The combined results of controlled synthesis, ab-initio molecular-dynamics liquid-quench simulations, thorough structure and property characterization, and accurate density-functional calculations helped identify four major components that govern the electrical, optical, thermal, and mechanical properties of prototype In-based AOSs: (i) deposition temperature; (ii) oxygen stoichiometry; (iii) cation composition; and (iv) lattice strain, Figure.
Morphological characterization of cube-shaped growth in a-ZITO(30) crystallization.
Morphological characterization of cube-shaped growth in a-ZITO(30) crystallization.
Jun 13, 2017
Northwestern Materials Research Science and Engineering Center

In-situ Crystallization and Morphological Evolution in Multicomponent Indium Oxide Thin Films

Peter Voorhees and Vinayak Dravid, Northwestern University MRSEC
Among all Transparent conducting oxides, Zinc-Indium-Tin Oxides are known for their good chemical stability, smooth surfaces and most importantly, high electrical conductivity. Having access to fundamental information like kinetics parameters is extremely important for processing and fabrication of these materials.
Density gradient centrifugation refines the shape distribution of gold nanostars in aqueous solution.
Density gradient centrifugation refines the shape distribution of gold nanostars in aqueous solution.
Jun 13, 2017
Northwestern Materials Research Science and Engineering Center

Homogeneous Gold Nanostars

Mark Hersam and Teri Odom, Northwestern University MRSEC
Anisotropic gold nanoparticles have been shown to possess desirable plasmonic and optical properties at the single particle level, but ensemble averaged measurements are compromised by the as-synthesized polydispersity in nanoparticle size and shape.
Synthesis of multimetallic nanoparticles via scanning probe block copolymer lithography, based upon the aggregation and reduction of multiple metal ion precursors in a polymer nanoreactor.
Synthesis of multimetallic nanoparticles via scanning probe block copolymer lithography, based upon the aggregation and reduction of multiple metal ion precursors in a polymer nanoreactor.
Jun 13, 2017
Northwestern Materials Research Science and Engineering Center

Polyelemental Nanoparticle Libraries

M. Hersam, V. Dravid, C. Mirkin, Northwestern University MRSEC
Multimetallic nanoparticles are useful in many fields, yet there are no effective strategies for synthesizing libraries of such structures with systematic compositional tunability.
Kirigami Nanofluidics
Kirigami Nanofluidics
Jun 13, 2017
Northwestern Materials Research Science and Engineering Center

Kirigami Nanofluidics

J. Huang, E. Luijten, M. Olvera de la Cruz, Northwestern University MRSEC
Restacked films of exfoliated 2D nanosheets can function as massive nanofluidic channel arrays. Recent research shows that cutting such membranes into asymmetric shapes leads to ionic current rectification.

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