Ryan R. Wixom
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View article: Surface acoustic waves and lattice vibrations in two-dimensional <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Ti</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">C</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>T</mml:mi><mml:mi>x</mml:mi></mml:msub></mml:mrow></mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>(</mml:mo><mml:mi>T</mml:mi><mml:mo>=</mml:mo><mml:mi mathvariant="normal">O</mml:mi><mml:mo>,</mml:mo><mml:mo> </mml:mo><mml:mi mathvariant="normal">F</mml:mi><mml:mo>)</mml:mo></mml:math> MXene films
Surface acoustic waves and lattice vibrations in two-dimensional MXene films Open
We investigated surface acoustic wave (SAW) propagation and lattice vibrations in two-dimensional (2D) titanium carbide (Ti3C2Tx) MXene films as a function of surface termination and layer stacking, using atomistic simulations. We found th…
View article: BeyondFingerprinting: AI-guided discovery of robust materials & processes
BeyondFingerprinting: AI-guided discovery of robust materials & processes Open
BeyondFingerprinting was a 2021-2024 Sandia Grand Challenge LDRD exploring the potential to develop new resilient materials and manufacturing processes by taking an artificial-intelligence (AI)-guided approach that integrates human-subject…
View article: Probing the Mechanical Properties of 2D Materials via Atomic‐Force‐Microscopy‐Based Modulated Nanoindentation
Probing the Mechanical Properties of 2D Materials via Atomic‐Force‐Microscopy‐Based Modulated Nanoindentation Open
As the field of low‐dimensional materials (1D or 2D) grows and more complex and intriguing structures are continuing to be found, there is an emerging need for techniques to characterize the nanoscale mechanical properties of all kinds of …
View article: Deposition and characterization of α-Fe2O3/Pd thin films for neutron reflectometry studies
Deposition and characterization of α-Fe2O3/Pd thin films for neutron reflectometry studies Open
We report deposition of hematite/Pd thin films on silicon wafers via radio frequency (RF) magnetron sputtering and subsequent characterization for future in situ neutron reflectometry studies. Following deposition, the hematite/Pd thin fil…
View article: Plasma Focused Ion Beam Nanothermometry
Plasma Focused Ion Beam Nanothermometry Open
In this report we detail demonstration of temperature dependent effects on grayscale intensity imaged in Focused Ion Beam (FIB) microscope, as well as secondary electron (SE) dependence on temperature in the Auger Electron Spectroscopy (AE…
View article: Study of Chromium Migration in a Nickel-Based Alloy Using Polarized Neutron Reflectometry and Rutherford Backscattering Spectrometry
Study of Chromium Migration in a Nickel-Based Alloy Using Polarized Neutron Reflectometry and Rutherford Backscattering Spectrometry Open
Haynes 230 nickel alloy is one of the main contenders for salt containment in the design of thermal energy storage systems based on molten salts. A key problem for these systems is understanding the corrosion phenomena at the alloy–salt in…
View article: Shock interactions with heterogeneous energetic materials
Shock interactions with heterogeneous energetic materials Open
The complex physical phenomenon of shock wave interaction with material heterogeneities has significant importance and nevertheless remains little understood. In many materials, the observed macroscale response to shock loading is governed…
View article: High‐Fidelity Microstructural Characterization and Performance Modeling of Aluminized Composite Propellant
High‐Fidelity Microstructural Characterization and Performance Modeling of Aluminized Composite Propellant Open
Image processing and stereological techniques were used to characterize the heterogeneity of composite propellant and inform a predictive burn rate model. Composite propellant samples made up of ammonium perchlorate (AP), hydroxyl‐terminat…
View article: CINT Monthly Report for May 2017
CINT Monthly Report for May 2017 Open
of the ASER and highlights many of the Laboratory’s environmental programs. The Environmental Report Summary recognizes efforts to create a sustainable future, control present processes to minimize impacts, and clean up past releases of ch…
View article: Near-failure detonation behavior of vapor-deposited hexanitrostilbene (HNS) films
Near-failure detonation behavior of vapor-deposited hexanitrostilbene (HNS) films Open
Hexanitrostilbene (HNS) films were deposited onto polycarbonate substrates using vacuum thermal sublimation. The deposition conditions were varied in order to alter porosity in the films, and the resulting microstructures were quantified b…
View article: Geometry effects on detonation in vapor-deposited hexanitroazobenzene (HNAB)
Geometry effects on detonation in vapor-deposited hexanitroazobenzene (HNAB) Open
Physical vapor deposition is a technique that can be used to produce explosive films with controlled geometry and microstructure. Films of the high explosive hexanitroazobenzene (HNAB) were deposited by vacuum thermal evaporation. HNAB dep…
View article: Spectroscopic analysis of time-resolved emission from detonating thin film explosive samples
Spectroscopic analysis of time-resolved emission from detonating thin film explosive samples Open
We report a series of time-resolved spectroscopic measurements that aim to characterize the reactions that occur during shock initiation of high explosives. The experiments employ time- and wavelength-resolved emission spectroscopy to anal…
View article: Characterizing the growth to detonation in HNS with small-scale PDV “cutback” experiments
Characterizing the growth to detonation in HNS with small-scale PDV “cutback” experiments Open
For many decades, cutback experiments have been used to characterize the equation of state and growth to steady detonation in explosive formulations. More recently, embedded gauges have been used to capture the growth to steady detonation …
View article: Extended asymmetric hot region formation due to shockwave interactions following void collapse in shocked high explosive
Extended asymmetric hot region formation due to shockwave interactions following void collapse in shocked high explosive Open
In both continuum hydrodynamics simulations and also multimillion atom reactive molecular dynamics simulations of shockwave propagation in single crystal pentaerythritol tetranitrate (PETN) containing a cylindrical void, we observed the fo…