Materials Science

/Materials Science

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’s Continuously Recirculating Falling-Particle Receiver Emplaced at Top of Solar Tower

Sandia researchers are working to lower the cost of solar energy systems and improve efficiencies in a big way, thanks to a system of small particles. Technologists John Kelton and Daniel Ray (both in Sandia’s Concentrating Solar Technologies Dept.) perform inspection of the falling-particle receiver during a cloud delay atop the NSTTF’s Solar Tower [...]

Sandia’s Z Machine Helps Solve Saturn’s Two-Billion-Year Age Gap

Planets tend to cool as they get older, but Saturn is hotter than astrophysicists say it should be without some additional energy source. The unexplained heat has caused a two-billion-year discrepancy for computer models estimating Saturn’s age. “Models that correctly predict Jupiter to be 4.5 billion years old find Saturn to be only 2.5 billion [...]

Small Electric Voltage Alters Conductivity in Key Materials

Using only a 9-volt battery at room temperature, a team led by Sandia researcher Jon Ihlefeld (in Sandia’s Electronic, Optical, & Nano Materials Dept.) has altered the thermal conductivity of the widely used material PZT (lead zirconate titanate) by as much as 11% at subsecond time scales. They did it without resorting to expensive surgeries [...]

Sandia Researchers Are First to Measure Thermoelectric Behavior of a Nanoporous Metal-Organic Framework

Thermoelectric devices convert heat to electricity and have no moving parts, making them extremely attractive for cooling and energy harvesting applications. Thermoelectric metal-organic frameworks (MOFs) could take these advantages a step further with improved performance, smaller size and flexible designs. MOFs have a crystalline structure that resembles molecular scaffolding, consisting of rigid organic molecules linked [...]

Sandia, Purdue University Sign MOU to Establish Strategic Alliance

Purdue University's engineering campus. In April, Sandia and Purdue University signed an extensive, five-year memorandum of understanding (MOU) to establish a strategic alliance that seeks to solve science and technology problems of national importance. The MOU has three principal goals: solve large national problems, sustain and engage human capital, and accelerate adoption of [...]

Hongyou Fan Chosen for Prestigious Lecture on Creating Nanomaterials

Sandia researcher Hongyou Fan to give the 2015 Fred Kavli Distinguished Lecture in Nanoscience. (Photo by Stephanie Blackwell) Sandia researcher Hongyou Fan (at the Advanced Materials Laboratory, operated in cooperation with the University of New Mexico) was selected by the Materials Research Society (MRS) and the Kavli Foundation to deliver the 2015 Fred [...]

Black Engineer of the Year Award

Sandia materials scientist Jon Madison (in Sandia’s Materials Mechanics & Tribology Dept.) was recently named the winner of a Black Engineer of the Year Award (BEYA) for Most Promising Scientist. Sandia National Laboratories materials scientist Jon Madison says a key to his academic and professional success was listening to the adults in his life. [...]

Asian-American Engineer of the Year (AAEOY) Awards

Two Sandia engineers were recognized during the 2015 AAEOY Awards Gala held in late February: Somuri Prasad (in Sandia’s Materials Mechanics &Tribology Dept.) received his AAEOY Award for pioneering contributions to the science/applications of tribology (interacting surfaces in relative motion) and mentorship of graduate students, postdoctoral associates, and early-career staff. Patrick Feng (in Sandia’s Rad/Nuc [...]