Measuring changes in rock
The capture and storage of carbon dioxide in deep geologic formations, a strategy for minimizing the impacts of greenhouse gases on global warming, may currently be technologically feasible. But one key question that must be answered is the ability of subsurface materials to maintain their integrity in the presence of supercritical carbon dioxide -- a fluid state in which the gas is condensed at high temperature and pressure into a liquid. A research team at the Pacific Northwest National Laboratory has developed tools in EMSL, a national user facility at PNNL, to study the effects of supercritical CO2 on minerals commonly found in potential storage sites. They are presenting their results today at the AVS 57th International Symposium & Exhibition, which takes place this week at the Albuquerque Convention Center in New Mexico.
"The mechanisms of surface interactions with carbon dioxide under these conditions are unknown," says Scott Lea of PNNL. "We need to know if the carbon dioxide can dry out the clay minerals, creating cracks or have other interactions that could create pores in the rock."
Because carbon dioxide will be stored at pressures many times greater than atmospheric pressure, the integrity of the rock must be assured.
The same temperature and pressure conditions create a challenge for researchers trying to observe changes in rock samples as they occur. The PNNL group will present a high pressure atomic force microscope (AFM) head that can integrate with existing commercial systems. The new AFM is designed to handle pressures up to 1500 psi. The presentation will show that the AFM head is capable of operating at temperatures and pressures required to maintain carbon dioxide in a supercritical state and that the noise levels are low enough to observe the atomic scale topographic changes due to chemical reactions that may occur between mineral substances and supercritical CO2.
Source: American Institute of Physics
- MIT: Safe storage of greenhouse-gas carbon dioxideMon, 17 Nov 2008, 12:56:46 EST
- Earthshaking possibilities may limit underground storage of carbon dioxideMon, 13 Dec 2010, 11:35:58 EST
- Health care accounts for 8 percent of US carbon footprintTue, 10 Nov 2009, 18:11:31 EST
- Global warming likely to be amplified by slow changes to Earth systemsSun, 20 Dec 2009, 13:37:21 EST
- Carbon capture and storage: Carbon dioxide pressure dissipates in underground reservoirsTue, 22 Mar 2011, 12:03:21 EDT
- Measuring changes in rock: Research looks at effect of stored carbon dioxide on mineralsfrom PhysorgWed, 20 Oct 2010, 13:01:47 EDT
- Measuring changes in rock: Research looks at effect of captured and stored carbon dioxide on mineralsfrom Science DailyWed, 20 Oct 2010, 12:31:00 EDT
- Effect of Captured and Stored Carbon Dioxide on Mineralsfrom Newswise - ScinewsWed, 20 Oct 2010, 11:30:42 EDT
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