Kim J.,University of Illinois at Urbana - Champaign |
Bae B.,Cbana Laboratories |
Hammonds J.,Howard University |
Kang T.,Air Liquide |
Shannon M.A.,University of Illinois at Urbana - Champaign
Sensors and Actuators, B: Chemical | Year: 2012
A micro-flame ionization detector (micro-FID) design is presented that is targeted for use in a portable gas sensor. Our micro-FID is based on a diffusion flame and features a folded flame structure that is more sensitive than a counter-flow flame designs. Unlike conventional FIDs that use a premixed or open diffusion flame, an air-hydrogen diffusion flame is employed and tested in an encapsulated structure of Quartz-Macor-Quartz layers. Diffusion flames are generally known to be more controllable and stable than premixed flames, where the stability of the micro-FID plays an important role for portable gas sensors. Various channel designs for oxidant and fuel flows meeting with different angles at the burner cavity are tested to obtain a stable flame and high output sensitivity over methane test samples. To verify the empirically designed microchannel, we simulate the temperature distribution in the microchannel by using computational fluid dynamics (CFD) software. To gauge the sensitivity of the device, the collected electric charges per mole (C/mol) is calculated and taken as a reference value of ionization efficiency. The result of the folded flame design is 1.959 × 10 -2 C/mol for methane that is about 34 times higher than the result using a counter-flow flame, which is 5.73 × 10 -4 C/mol for methane, while one of the commercial macro FIDs' is 10 -1 C/mol. This result shows that the micro-FID using the folded flame structure has higher ionization efficiency with less leakage of the analytes than of the classical counter-flow flame design. © 2012 Elsevier B.V. Source
Cbana Laboratories | Entity website
Agency: National Aeronautics and Space Administration | Branch: | Program: SBIR | Phase: Phase I | Award Amount: 100.00K | Year: 2010
The Lunar Exploration Analysis Group (LEAG) has placed a high priority on determining the nature, distribution and transport of volatiles on the moon. The objective of this proposal is to create chip scale gas chromatographs for lunar exploration. Under DARPA support, Cbana has created a new class of microGCs that are smaller than ever before and yet show performance similar to those of full scale commercial GCs. In the proposed work we will redesign the GCs so that they can separate and detect the likely volatiles on the moon. A key step will be to replace the single GC column in our current device with 3 columns in series integrated into the same package in the proposed device. We will develop methodology to construct columns with the proper coatings and integrate them into a single package. We will also explore the effects of the temperature gradients on the columns in the harsh environment near the lunar poles. The will enable cbana to design devices that will be effective on the moon in phase II.
Agency: Department of Defense | Branch: Army | Program: STTR | Phase: Phase II | Award Amount: 727.59K | Year: 2010
Based on the successful result of the developed micro-FID that was achieved in the Phase I, we propose to integrate a micro-gas analyzer and an optimized micro-FID to obtain the highest signal to noise ratio with a minimum usage of hydrogen for a portable
Agency: Environmental Protection Agency | Branch: | Program: SBIR | Phase: Phase I | Award Amount: 70.00K | Year: 2010
The objective of this project is to evaluate the feasibility of using some newly discovered materials, water-stable metal-organic frameworks (MOF), as filters for pollutants common in indoor air. By way of background, recent Defense Advanced Research Projects Agency (DARPA)-supported work from Professor Masel’s laboratory has shown that a new class of water-stable MOFs shows unprecedented adsorption capacity for a chemical weapons agent stimulant: 0.23 g of dimethyl methylphosphonate (DMMP) per cc of adsorbent at room temperature. The materials are stable in air and do not adsorb water. Synthesis can be done in less than 1 minute using a household microwave. In this Phase I project, Cbana Labs will modify the materials for creating porous networks of the materials that are suitable for toxic industrial capture (TIC), build pellets and other low pressure drop structures, and test metals and dyes for enhancing the ability of materials for TIC and indicating the presence of the compounds.