Advanced Science and Technology

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Smart materials for highly complex tags with environmental response

News Article, June 22, 2023 • Cover of the Journal of the German Chemical Society Angewandte Chemie International Edition As counterfeiting methods become more sophisticated, countermeasures must be developed at the same pace. In this Sandia LDRD project, unique exemplars of next generation anticounterfeiting optical tags were developed that leverage the luminescent properties of materials for...

Stress intensity thresholds for development of reliable brittle materials

News Article, June 22, 2023 • Cover of the Journal of the American Ceramic Society Brittle material failure can appear random and unpredictable at subcritical stresses. A fundamental understanding of how structural and environmental factors impact fracture propagation is necessary to predict fracture in these systems. Through this project, a physics-based model of glass fracture was...

The Journal of the American Ceramic Society featuring the Sandia research projects.

Understanding molecular-scale effects on fracture can inform resource extraction and help maintain the nation’s infrastructure

News Article, June 8, 2023 • Three images show liquid nanoindentation setup, the indentation site, and water inside the crack tip in a molecular dynamics simulation. Subcritical fracture controls deformation and permeability of rocks and degradation of manmade materials. To further understand the chemical mechanisms controlling subcritical fracture, this three-year project created nanomechanical and continuum-scale mechanics...

Wide-bandgap semiconductors benefit from development of single-photo sources in gallium nitride

News Article, June 8, 2023 • Single-photon sources based on atom-like features in solid-state materials offer the prospect for integrated, on-demand solid-state platforms and are being intensively explored for numerous mission-related quantum information technologies. Gallium nitride (GaN) is a very hard, mechanically stable wide-bandgap (WBG) semiconductor that permits devices to operate at much higher voltages, frequencies,...