Novel Amine-Functional Membrane for Metabolic CO2 Removal from Spacesuit Breathing Loop

Details Novel Amine-Functional Membrane for Metabolic CO2 Removal from Spacesuit Breathing Loop Novel Amine-Functional Membrane for Metabolic CO2 Removal from Spacesuit Breathing Loop

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..654..861t&link_type=abstract

SPACE TECHNOLOGY AND APPLICATIONS INT.FORUM-STAIF 2003: Conf.on Thermophysics in Microgravity; Commercial/Civil Next Generation

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Applications

Spaceborne And Space Research Instruments, Apparatus, And Components, Porous Materials, Granular Materials

Scientific paper

We developed a unique porous membrane material with amine-functional pore surfaces using surfactant templating techniques for CO2 removal from the breathing loop of spacesuits. We use evaporation during coating to induce the formation of surfactant micelles that self-organize into desirable pore structures. The membrane, with secondary amine functional groups inside the membrane pores, showed a dual-gas separation factor at 90°C that was ten times higher than the ideal Knudsen separation factor. A CO2 flux of 4 GPU (IGPU (gas permeation unit) =10-6 cm3 (STP)/cm2-s-cmHg) was observed. When the temperature was reduced to 20°C, the mixed-gas separation factor increased two fold, indicating enhanced CO2 surface diffusion via active amine adsorption sites at lower temperatures. An amine-functional membrane could offer a unique alternative to NASA's current capability for regeneratively removing CO2 from spacesuit breathing loop.

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