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Highlights

Hydrogels from DNA mimicking polymers and DNA
Hydrogels from DNA mimicking polymers and DNA
Jun 10, 2019
University of Colorado at Boulder

Hydrogels from DNA mimicking polymers and DNA

X. Han1, D.W. Domaille1, B.D. Fairbanks1, L. He1, H.R. Colver1, X. Zhang1, J.N. Cha1, C.N. Bowman1   1 Department of Chemical and Biological  Engineering, University of Colorado, Boulder, CO 80309, USA.
Radical, light initiated chemical reactions were used to synthesize multifunctional, star-shaped polmyers with each chain end bound to a DNA mimicking polymer (the “Click Nucleic Acid or CNA developed with the support of the NSF).  
The Role of Chain Connectivity Across an Interface on the Dynamics of a Nanostructured Block Copolymer
The Role of Chain Connectivity Across an Interface on the Dynamics of a Nanostructured Block Copolymer
Jun 6, 2019
Princeton University

The Role of Chain Connectivity Across an Interface on the Dynamics of a Nanostructured Block Copolymer

D. Christie1, R.A. Register1, R.D. Priestley1, “The Role of Chain Connectivity Across an Interface on the Dynamics of a Nanostructured Block Copolymer,” Physical Review Letters, 121, 247801 (2018). 1Princeton University
Princeton investigators developed an approach to directly measure the influence of chain connectivity on the glass transition temperature of copolymers for the first time. This development is important as it provides insights into the design of copolymer interfaces for applications in which transport of entities is important.
Schematic of expected conducting lanes where electrons can flow at the boundaries between regions with opposite orientations of electron orbits.
Schematic of expected conducting lanes where electrons can flow at the boundaries between regions with opposite orientations of electron orbits.
Jun 6, 2019
Princeton University

Controllable electron flow in quantum wires

M. T. Randeria1, K. Agarwal1, B. E. Feldman2, H. Ding1, H. Ji1, R. J. Cava1, S. L. Sondhi1, S. A. Parameswaran3 and A. Yazdani1 1 Princeton Univesity,  2 Stanford University 3 University of Oxford
Princeton investigators detected channels of conducting electrons that form between two quantum states on the surface of a bismuth crystal subjected to a high magnetic field. These two states consist of electrons moving in elliptical orbits with different orientations. The researchers found that the current flow in these channels can be turned on and off, making these channels a new type of controllable quantum wire.
Freely Jointed Polymers Made of Droplets
Freely Jointed Polymers Made of Droplets
May 20, 2019
New York University

Freely Jointed Polymers Made of Droplets

Angus McMullen, Miranda Holmes-Cerfon, Francesco Sciortino, Alexander Y. Grosberg, and Jasna Brujic, New York University
Here, we control the valence of DNA-functionalized emulsion droplets to make flexible colloidal polymers. We examine their conformational statistics to show that they are freely jointed. We demonstrate that their end-to-end length scales with the number of bonds in agreement with 2D Flory theory, and that their diffusion follows the Zimm model.
A Fully Voltage-Controlled Spin Logic Device
A Fully Voltage-Controlled Spin Logic Device
May 20, 2019
New York University

A Fully Voltage-Controlled Spin Logic Device

Rakheja, Flatté and Kent, New York University
An important goal in electronics is to reduce power use without sacrificing performance. In spintronics this can be accomplished by increasing the rate of charge to spin conversion. We show that one of the most efficient means of converting charge to spin information uses a topological insulator and voltages instead of currents.  
Hierarchical Coherent Phonons
Hierarchical Coherent Phonons
May 20, 2019
Columbia University in the City of New York

Hierarchical Coherent Phonons

Xiaoyang Zhu, Xavier Roy, Colin Nuckolls, Center for Precision Assembly of Superstratic and Superatomic Solids
The coupling of phonons to electrons, excitons and other phonons plays a defining role in material properties, including charge and energy transport, light emission, and superconductivity. In atomic solids such as Si or GaAs, phonons are delocalized over the three-dimensional (3D) lattice and are determined by bonding and crystal symmetry. In molecular materials, by contrast, localized molecular vibrations couple to electrons to produce, for example, high temperature superconductivity, as in A3C60.
2D Superconductivity
2D Superconductivity
May 20, 2019
Columbia University in the City of New York

2D Superconductivity

Cory Dean, Center for Precision Assembly of Superstratic and Superatomic Solids
Two-dimensional materials offer a unique opportunity to explore superconductivity in the two-dimensional (2D) limit with low disorder.  IRG1 creates heterostructures of high-quality monolayers of superconductors encapsulated within insulating boron nitride, which provides protection from external disorder and oxidation.
A base hydrogel, combined with collagen, allows for a mechanical response similar to natural cartilage. A small addition of collagen significantly enhances the mechanical properties.
A base hydrogel, combined with collagen, allows for a mechanical response similar to natural cartilage. A small addition of collagen significantly enhances the mechanical properties.
May 17, 2019
Cornell University

Biomimetic design of 3D-printed cartilege

Cornell researchers employ advanced 3D printing technologies, along with bio-inspired design principles and multiscale predictive modeling to optimize the chemo-mechanical properties of bioprinted artificial cartilage.
The degree of tilt of the RuO6 octahedra in the SrRuO3 film, as determined by ultra-high resolution electron microscopy, determines the magnitude of the spin Hall effect in the material.
The degree of tilt of the RuO6 octahedra in the SrRuO3 film, as determined by ultra-high resolution electron microscopy, determines the magnitude of the spin Hall effect in the material.
May 17, 2019
Cornell University

Maximizing the spin Hall effect by tuning crystal structure

Y. Ou, Z. Wang, C. S. Chang, H. Nair, H. Paik, N. Reynolds, D. C. Ralph, D. A. Muller, D. G. Schlom, and R. A. Buhrman (Cornell University)
Cornell scientists have found that thin films of SrRuO3, when optimally produced, have an exceptionally high spin Hall ratio. This is directly correlated with the degree that octahedral RuO6 subunits in the crystal are tilted away from a flat in-plane orientation.
Graduate students (top) Omar Padilla Velez teaching high school students at Escuela Cedin about batteries with electrochemistry lab and (bottom) Berit Goodge presenting how to build a microscope using pvc pipes and lenses at Sebastian Bilingual High School in Puerto Rico.
Graduate students (top) Omar Padilla Velez teaching high school students at Escuela Cedin about batteries with electrochemistry lab and (bottom) Berit Goodge presenting how to build a microscope using pvc pipes and lenses at Sebastian Bilingual High School in Puerto Rico.
May 17, 2019
Cornell University

Teaching and Inspiring Students in Puerto Rico

Graduate student Omar Padilla Velez, an NSF Graduate Research Fellow, gathered a team of Cornell scientists working in fields from Chemistry to Physics, to bring science to students from middle to undergraduate schools in Puerto Rico.

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