Claudia Luhrs
Naval Postgraduate School
Analytical chemistryNanoparticleComposite materialEpoxyNanotechnologyCarbon nanofiberChemistryIon sourceMaterials scienceScanning electron microscopeGraphiteOxideNano-GrapheneRaman spectroscopyChemical engineeringCarbonCarbon nanotubeMetalArgonThermogravimetric analysisPlasma
57Publications
15H-index
781Citations
Publications 59
Newest
#1Brian Earp (NPS: Naval Postgraduate School)
#1Brian Earp (NPS: Naval Postgraduate School)H-Index: 3
Last. Claudia Luhrs (NPS: Naval Postgraduate School)H-Index: 15
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Abstract The properties of CNT composites are known to suffer changes when exposed to space conditions or simulated space environments. A more in-depth understanding of the magnitude of those changes could help improve the design of systems that contain them, produce more accurate predictions of their performance, or even open the possibility of new applications. In this study, the electrical properties of CNT epoxy composites containing low CNT loadings (less than 1%) were measured in-situ whil...
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#1Jonathan PhillipsH-Index: 29
#1Jonathan Phillips (NPS: Naval Postgraduate School)H-Index: 3
Last. Claudia LuhrsH-Index: 15
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A simple, low temperature, method, hydrogen-enhanced atomic transport (HEAT), for creating metallic-bonded brown bodies of order 40% bulk density in molds of designed shape from Ti metal particles is introduced. In this initial study 40 micron titanium particles were poured into graphite molds, then heated to temperatures equal to or greater than 650 °C for four hours in a flowing ambient pressure gas mixture containing some hydrogen led to brown body formation that closely mimicked the mold sha...
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#1Brian Earp (NPS: Naval Postgraduate School)H-Index: 3
#2Durward Dunn (NPS: Naval Postgraduate School)H-Index: 1
Last. Claudia Luhrs (NPS: Naval Postgraduate School)H-Index: 15
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Abstract The ability to translate the high electrical conductivity of individual carbon nanotubes to bulk carbon nanotube materials has proven challenging. In this work, we present the use of reduction expansion synthesis to attach copper nanoparticles to the surface of tubes within carbon nanotube sheets. Those metallic particulates serve as a link between the tube strands in the carbon nanotube network and promote an increase in electrical conductivity. The reduction expansion synthesis proces...
4 CitationsSource
#1Alexa Rizzo (NPS: Naval Postgraduate School)H-Index: 1
#2Claudia LuhrsH-Index: 15
Last. Dragoslav GrbovicH-Index: 11
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In this study, carbon nanotube (CNT) epoxy composite films were fabricated, characterized, and tested as resonant, plasmonic metamaterials. CNT-epoxy formulations, containing diverse CNT loadings, were fabricated and templates were used to generate repeating arrays of squares of diverse dimensions. Their absorption characteristics were characterized by collecting free space reflectivity data in the microwave band, using an arch setup in an anechoic chamber. Data were collected from 2 to 20 GHz. ...
1 CitationsSource
#1Brian Earp (NPS: Naval Postgraduate School)H-Index: 3
#2Jonathan Phillips (NPS: Naval Postgraduate School)H-Index: 3
Last. Claudia Luhrs (NPS: Naval Postgraduate School)H-Index: 15
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Carbon nanotube (CNT) conductive composites have attracted significant attention for their potential use in applications such as electrostatic dissipation and/or electromagnetic interference shielding. The focus of this work is to evaluate resistivity trends of extremely low loading (<0.1 wt%) epoxy-CNT composites that lack a connected CNT network, but still present electrical conductivity values appropriate for those uses. The impact of current, temperature, and cycle life on electrical propert...
3 CitationsSource
#1Troy Y. AnsellH-Index: 5
#2Joshua P. RicksH-Index: 1
Last. Claudia LuhrsH-Index: 15
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Changes in the mechanical properties of selective laser melted maraging steel 300 induced by exposure to a simulated marine environment were investigated. Maraging steel samples were printed in three orientations: vertical (V), 45° (45), and horizontal (H) relative to the print bed. These were tested as-printed or after heat-treatment (490 °C, 600 °C, or 900 °C). One set of specimens were exposed in a salt spray chamber for 500 h and then compared to unexposed samples. Environmental attack induc...
2 CitationsSource
#1Elena Arce (USNA: United States Naval Academy)H-Index: 1
#2Richa Agrawal (NPS: Naval Postgraduate School)H-Index: 10
Last. Claudia Luhrs (NPS: Naval Postgraduate School)H-Index: 15
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This manuscript integrates the experimental findings of recently developed epoxy-phase change material (PCM) formulations with modeling efforts aimed to determine the energy demands and savings derived from their use. The basic PCM system employed was composed of an epoxy resin, a thickening agent, and nonadecane, where the latter was the hydrocarbon undergoing the phase transformation. Carbon nanofibers (CNF) and boron nitride (BN) particulates were used as heat flow enhancers. The thermal cond...
1 CitationsSource
#1Zachary Daniels (NPS: Naval Postgraduate School)H-Index: 1
#2Wilson Rydalch (NPS: Naval Postgraduate School)H-Index: 1
Last. Jonathan Phillips (NPS: Naval Postgraduate School)H-Index: 29
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Described herein is a novel method, Reduction Expansion Synthesis-Sintered Metal (RES-SM), to create a sintered metal body of a designed shape at ambient pressure, hundreds of degrees below the metal melting temperature. The precursor to the metal part is a mixture of metal oxide particles and activated metal particles, and in this study specifically nickel oxide and activated nickel metal particles. It is postulated that the metal oxide component is reduced via exposure to chemical radical spec...
1 CitationsSource
#1Richa Agrawal (NPS: Naval Postgraduate School)H-Index: 10
#2Farsai Anantachaisilp (NPS: Naval Postgraduate School)H-Index: 1
Last. Claudia Luhrs (NPS: Naval Postgraduate School)H-Index: 15
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#1Ken G. Foos (NPS: Naval Postgraduate School)
#2Troy Y. Ansell (NPS: Naval Postgraduate School)H-Index: 5
Last. Claudia Luhrs (NPS: Naval Postgraduate School)H-Index: 15
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Surrogate glasses were fabricated by the sol–gel process aiming to produce compositions similar to naturally occurring tektite. The volatile species in the xerogel samples were removed by heat treatments. All products were characterized by thermal analysis, scanning electron microscopy, X-ray diffraction and energy dispersive spectroscopic techniques. The elemental distribution in the surrogates was found to be more homogeneous than the one observed in natural materials. This work presents an al...
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