Microfluidic ion mobility chromatograph
This paper describes the development of a microfluidic ion mobility chromatograph for small inorganic ion analysis.
microfluids separation ion chromatography↗
Engineering topics
Grunthaner, F.
Publications and source records attributed to Grunthaner, F..
Nano-fabricated size exclusion chromatograph
This poster describes the development of a nano-fabricated size exclusion chromatograph (nSEC) based on the principle that molecules traveling through a microcolumn containing nano-fabricated features will have characteristics elution times that directly correlate to molecular weight.
Nanofluidics microfluidics lab-on-a-chip↗
Nano-fabricated size exclusion chromatograph
This paper describes the development of a nano-fabricated size exclusion chromatograph (nSEC) based on the principle that molecules traveling through amicrocolumn containing nano-fabricated features will have characteristic elution times that directly correlate to molecular weight. Compared to conventional size exclusion chromatography, the nSEC offers greater control over the size exclusion process; mass fabrication; integration of the separation column with associated valves, pumps, and detectors; and dramatic reductions in instrument mass and power requirements.
nanofluids lab-on-a-chip chromatograph separation↗
Integrated Micro-Chip Amino Acid Chirality Detector for MOD
Integration of a micro-chip capillary electrophoresis analyzer with a sublimation-based extraction technique, as used in the Mars Organic Detector (MOD), for the in-situ detection of amino acids and their enantiomers on solar system bodies. Additional information is contained in the original extended abstract.
Glavin, D. P.↗
Mars Atmospheric Oxidant Sensor (MAOS): An In-Situ Heterogeneous Chemistry Analysis
A new chemical sensor designed to detect oxidants in the martian environment has been developed. Additional information is contained in the original extended abstract.
Zent, A. P.↗
Stability of Hydroxylated Minerals on Mars: A Study on the Effects of Exposure to Ultraviolet Radiation
The density and composition of the martian atmosphere allow solar ultraviolet photons with wavelengths as short as 190 nanometers to reach the surface. We investigate the hypothesis that this UV radiation is capable of inducing the realese of water from iron oxyhydroxide minerals resulting in the formation of oxide phases.
Mars↗
Multisensors for Space
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multisensors space sensors electronic nose radiati↗
Intergrated Microchemical Analysis System Using DS2 Penetrator Technology for the Enantiomeric Detection of Amino Acids
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Amino Acids enanciomeric detection↗
MOD: An Organic Detector for the Future Exploration of Mars
The Mars Organic Detector (MOD) is designed to assess whether organic compounds, possibly associated with life, are present in Martian rock and soil samples. MOD has a detection limit that is at least two orders of magnitude more sensitive than the Viking GCMS. MOD is focused on detecting amino acids, amines and PAH (polycyclic aromatic hydrocarbons). Amino acids play an essential role in biochemistry on Earth and PAH are widespread throughout the universe and can provide an indication of the delivery of meteoritic organic material to Mars. The advantage of MOD is the absence of wet chemistry and its simple and robust design. The sample will be extracted from the mineral matrix (0.1 - 1 g of rock-powder) using sublimation and analyzed with a fluorescence detector. The isolation method is based on the fact that amino acids and PAH are volatile at temperatures greater than 150C. The fluorescence detection scheme is based on UV excitation with LED's, optical filters, PrN diode photon detector and a sample calibration reservoir. Fluorescamine is used as a fluorescing reagent for amino acids and amines, while PAH are naturally fluorescent. There is no sample preparation required and the turnaround time for a single analysis is on the order of minutes.
Kminek, G.↗
Sensor Cleanliness and Sterility Issues
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Radmon E-Nose MOX↗
Delta-Doped CCDs for Enhanced UV Performance
Thin, backside-illuminated CCds are modified by growing a delta-doped silicon layer on the back surface using molecular beam epitaxy. Delta-doped CCDs exhibit stable and uniform 100 percent internal quantum efficiency. The process consists of growth of an epitaxial silicon layer on a fully-processed commercial CCd die in which 30 percent of a monolayer of boron atoms are incorporated into the lattice nominally in a single atomic layer. Long term stability was tested and showed no degradation of the device quantum efficiency over sixteen months.
silicon↗
Delta-Doped CCDs as Stable, High Sensitivity, High Resolution UV Imaging Arrays
This oral presentation discusses the delta-doped CCD concept and process.
CCD↗
Modulation Collimator Fine Grids for HESP
The proposed High Engergy-Solar Physics (HESP) million will require fine, precise, high aspect ratio modulation collimators for the High Energy Imagin Spectrometer (HEISPEC). The fabrication approach described here rests on the proven precision of semiconductor lithography - the ability to replicate extremely accurate patterns onto different planar substrateds.
LIGA HESP pitch structures solar x-rays gamma rays↗
Growth of (111) GaAs on (111) Si using molecular-beam epitaxy
(111) GaAs layers have been grown epitaxially on (111) Si wafers, both on-axis as well as 3-deg off-axis towards the 1 -1 0 direction, using molecular-beam epitaxy. The grown layers have been characterized by scanning electron microscopy, X-ray diffraction, and transmission electron microscopy.
Radhakrishnan, G.↗
Proposed distributed feedback crystal cavities for X-ray lasers
The use of zeolite crystals in distributed feedback crystal cavities for X-ray emissions is proposed. The zeolite crystals can guide the emitted X rays and can also generate the feedback necessary for self-sustained oscillation. A table lists the parameters of some typical zeolite crystals.
Elachi, C.↗