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Sandia Researchers Win Best Paper Award from the American Institute of Aeronautics and Astronautics

Researchers Joe Oefelein and Guilhem Lacaze (both in Sandia’s Reacting Flow Research Dept.) won the American Institute of Aeronautics and Astronautics’ (AIAA’s) best paper award for their work on scramjet engine simulations. The paper, “A Priori Analysis of Flamelet-Based Modeling for a Dual-Mode Scramjet Combustor,” was a collaboration with Jesse Quinlan and James McDaniel (Univ. [...]

Detecting rare, abnormally large grains by x-ray diffraction

The theme of the Nanomechanics and Nanometallurgy of Boundaries project at Sandia National Labs is to understand the connection between mechanical deformation and grain boundary instability in nanocrystalline metals. Our prior observations have led to the hypothesis that fatigue-induced abnormal grain growth is a precursor to crack initiation in nanocrystalline metals [Padilla et al, Metall. [...]

By | 2016-12-02T18:47:55+00:00 October 16th, 2015|Office of Science|0 Comments

Phase Field model elucidates competing thermodynamic effects on nanocrystalline stability

Recent experimental and theoretical results suggest that nanocrystalline metals can be thermodynamically stabilized by the free energy gain associated with the segregation of solute atoms to the grain boundary which will reduce grain boundary energy and so the driving force for nanocrystalline coarsening. A detail understanding of this proposed mechanism requires detangling the thermodynamics of [...]

By | 2016-12-02T18:47:55+00:00 October 16th, 2015|Office of Science|0 Comments

Hydrogen Fuel-Cell Unit to Provide Renewable Power to Honolulu Port

Pete Devlin, of the Department of Energy’s Fuel Cell Technology Office, cut the ribbon to initiate the Maritime Hydrogen Fuel Cell project to test a hydrogen-fuel-cell-powered generator at Young Brothers Ltd.’s Port of Honolulu facility. Left to right: Mark Glick, Hawaii State Energy Office, Glenn Hong, Young Brothers Ltd., Pete Devlin, John Quinn, US [...]

Enhanced Nanoparticle Size Control by Extending LaMer’s Mechanism

The synthesis of well-defined nanoparticle materials has been an area of intense investigation, but size control in nanoparticle syntheses is largely empirical. Here, we introduce a general method for fine size control in the synthesis of nanoparticles by establishing steady state growth conditions through the continuous, controlled addition of precursor, leading to a uniform rate [...]

By | 2016-12-02T18:48:00+00:00 September 11th, 2015|Office of Science|0 Comments

Biomimetic Approach to Nanoparticle Growth

Scientific Achievement Akin to constant concentration biological growth, a new ‘Extended LaMer’ method for reproducible and predictable synthesis of nanoparticles was developed. Significance and Impact This general approach allows systematic production of precise, monodisperse nanoparticles of any size in a scale-independent approach. Applications include quantum dots, metal nanoparticles, and magnetic particles, which all display size-dependent [...]

By | 2016-12-02T18:48:00+00:00 September 11th, 2015|Office of Science|0 Comments

Sandia Develops Phased-Array Sources Based on Nonlinear Metamaterial Nanocavities

The SH-generating quantum well layer (pink) and the beam-shaping split-ring metamaterial resonators (the “C”-shaped structures). The phase-coherent emission from individual resonators opens the door for many beam-shaping applications, some of which are presented in the insets. Each device type can be achieved via proper design of individual metamaterial resonators and their arrangement on the [...]

Phononic Crystals: Engineering the Flow of Heat

A Sandia-led research team† has, for the first time, observed the coherent propagation of thermal phonons‡ in silicon at room temperature—in two-dimensional phononic crystals formed by introducing air holes in a silicon matrix with minimum feature sizes ~250 nm. To separate incoherent from coherent boundary scattering, the team fabricated phononic crystals with a fixed minimum feature [...]

Sandia Research Featured on Journal of Physical Chemistry A Cover

As part of Sandia’s core geochemistry program funded by DOE Office of Basic Energy Sciences (BES), Sandia’s Randall Cygan (in Sandia’s Geoscience Research and Applications Dept.) and his collaborators, W. Crawford Elliott and his PhD student Laura Zaunbrecher from Georgia State University, have been examining the adsorption mechanisms of metal cations onto soils and sediments. [...]

Sandia–Univ. of Rochester Win Funding to Demonstrate Fuel Magnetization and Laser Heating Tools for Low-Cost Fusion Energy

Sandia and the Laboratory for Laser Energetics (LLE) at the University of Rochester will investigate the compression and heating of high energy-density, magnetized plasmas at fusion-relevant magneto-inertial [confinement] fusion (MIF) conditions, building on the recent Magnetized Liner Inertial Fusion (MagLIF) concept successes. The SNL-LLE team will conduct focused experiments based on the MagLIF approach at [...]