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Dive into the research topics where Adam S. Pimentel is active.

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Featured researches published by Adam S. Pimentel.


Analytical Sciences | 2015

Development of a Mesoscale Pulsed Discharge Helium Ionization Detector for Portable Gas Chromatography

Ronald P. Manginell; Curtis D. Mowry; Adam S. Pimentel; Michael A. Mangan; Matthew W. Moorman; Elizabeth Schares Sparks; Amy Allen; Komandoor E. Achyuthan

Miniaturization of gas chromatography (GC) instrumentation enables field detection of volatile organic compounds (VOCs) for chembio-applications such as clandestine human transport and disease diagnostics. We fabricated a mesoscale pulsed discharge helium ionization detector (micro-PDHID) for integrating with our previously described mini-GC hardware. Stainless steel electrodes fabricated by photochemical etching and electroforming facilitated rapid prototyping and enabled nesting of inter-electrode insulators for self-alignment of the detector core during assembly. The prototype was ∼10 cm(3) relative to >400 cm(3) of a commercial PDHID, but with a comparable time to sweep a VOC peak from the detector cell (170 ms and 127 ms, respectively). Electron trajectory modeling, gas flow rate, voltage bias, and GC outlet location were optimized for improving sensitivity. Despite 40-fold miniaturization, the micro-PDHID detected 18 ng of the human emanation, 3-methyl-2-hexenoic acid with <3-fold decrease in sensitivity relative to the commercial detector. The micro-PDHID was rugged and operated for 9 months without failure.


Analytical Sciences | 2016

Pulsed Discharge Helium Ionization Detector for Highly Sensitive Aquametry

Curtis D. Mowry; Adam S. Pimentel; Elizabeth Schares Sparks; Matthew W. Moorman; Komandoor E. Achyuthan; Ronald P. Manginell

Trace moisture quantitation is crucial in medical, civilian and military applications. Current aquametry technologies are limited by the sample volume, reactivity, or interferences, and/or instrument size, weight, power, cost, and complexity. We report for the first time on the use of a pulsed discharge helium ionization detector (PDHID-D2) (∼196 cm(3)) for the sensitive (limit of detection, 0.047 ng; 26 ppm), linear (r(2) >0.99), and rapid (< 2 min) quantitation of water using a small (0.2 - 5.0 μL) volume of liquid or gas. The relative humidity sensitivity was 0.22% (61.4 ppmv) with a limit of detection of less than 1 ng moisture with gaseous samples. The sensitivity was 10 to 100 to fold superior to competing technologies without the disadvantages inherent to these technologies. The PDHID-D2, due to its small footprint and low power requirement, has good size, weight, and power-portability (SWAPP) factors. The relatively low cost (∼


Powder Diffraction | 2016

Monitoring of CoS2 reactions using high-temperature XRD coupled with gas chromatography (GC)

Mark A. Rodriguez; Eric N. Coker; James Griego; Curtis D. Mowry; Adam S. Pimentel; Travis M. Anderson

5000) and commercial availability of the PDHID-D2 makes our technique applicable to highly sensitive aquametry.


Archive | 2013

Materials characterization activities for %E2%80%9CTake Our Sons&Daughters to Work Day%E2%80%9D 2013.

Curtis D. Mowry; Adam S. Pimentel; Elizabeth Schares Sparks; Brittany Paula Hanlon

High-temperature X-ray diffraction with concurrent gas chromatography (GC) was used to study cobalt disulfide cathode pellets disassembled from thermal batteries. When CoS 2 cathode materials were analyzed in an air environment, oxidation of the K(Br, Cl) salt phase in the cathode led to the formation of K 2 SO 4 that subsequently reacted with the pyrite-type CoS 2 phase leading to cathode decomposition between ~260 and 450 °C. Independent thermal analysis experiments, i.e. simultaneous thermogravimetric analysis/differential scanning calorimetry/mass spectrometry (MS), augmented the diffraction results and support the overall picture of CoS 2 decomposition. Both gas analysis measurements (i.e. GC and MS) from the independent experiments confirmed the formation of SO 2 off-gas species during breakdown of the CoS 2 . In contrast, characterization of the same cathode material under inert conditions showed the presence of CoS 2 throughout the entire temperature range of analysis.


Journal of Breath Research | 2013

Diagnostic potential of the pulsed discharged helium ionization detector (PDHID) for pathogenic Mycobacterial volatile biomarkers

Ronald P. Manginell; Adam S. Pimentel; Curtis D. Mowry; Michael A. Mangan; Matthew W. Moorman; Amy Allen; Elizabeth S. Schares; Komandoor E. Achyuthan

We created interactive demonstration activities for Take Our Daughters&Sons to Work Day (TODSTWD) 2013 in order to promote general interest in chemistry and also generate awareness of the type of work our laboratories can perform. %E2%80%9CCurious about Mars Rover Curiosity?%E2%80%9D performed an elemental analysis on rocks brought to our lab using the same technique utilized on the planet Mars by the NASA robotic explorer Curiosity. %E2%80%9CFood is Chemistry?%E2%80%9D utilized a mass spectrometer to measure, in seconds, each participants breath in order to identify the food item consumed for the activity. A total of over 130 children participated in these activities over a 3 hour block, and feedback was positive. This document reports the materials (including handouts), experimental procedures, and lessons learned so that future demonstrations can benefit from the baseline work performed. We also present example results used to prepare the Food activity and example results collected during the Curiosity demo.


Journal of Chemical Education | 2017

Laser-Induced Breakdown Spectroscopy for Qualitative Analysis of Metals in Simulated Martian Soils

Curtis D. Mowry; Rob Milofsky; William R. Collins; Adam S. Pimentel


Archive | 2015

?Food is Chemistry? Fun Student Demonstration ? Breath Analysis Using Direct Analysis in Real Time (DART) Mass Spectrometry.

Curtis D. Mowry; Adam S. Pimentel


Archive | 2015

Validation of Liquid and Gas H2S Concentrations Via Derivatization-LC/MS and GC/MS for Determining Skin Transport.

Adam S. Pimentel; Curtis D. Mowry; Nancy L. Kanagy; Lynn Rios; Reza Shekarriz


Archive | 2015

Saturation Sensor to Protect Explosives Detection Equipment.

Nathaniel Bryant Pfeifer; Ronald P. Manginell; Matthew W. Moorman; Douglas Read; Curtis D. Mowry; Adam S. Pimentel; Kevin L. Linker


Archive | 2014

Water As an Analyte? Update on Figures of Merit for Moisture Measurements Using Pulsed Discharge Ionization Detection.

Curtis D. Mowry; Adam S. Pimentel; Elizabeth Schares Sparks; Brittany Paula Hanlon; James Michael Hochrein; Lance Lee Miller; Michael Irvin White

Collaboration


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Curtis D. Mowry

Sandia National Laboratories

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Matthew W. Moorman

Sandia National Laboratories

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Ronald P. Manginell

Sandia National Laboratories

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Amy Allen

Sandia National Laboratories

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Michael A. Mangan

Sandia National Laboratories

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Alan W. Staton

Sandia National Laboratories

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Bryan. Carson

Sandia National Laboratories

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Elizabeth S. Schares

Sandia National Laboratories

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