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Atomic modifications by synchrotron radiation at the calcite-ethanol interface.

I S Pasarín1, N Bovet, M Glyvradal

  • 1Nano-Science Center, Department of Chemistry, University of Copenhagen, Denmark. isp@nano.ku.dk

Journal of Synchrotron Radiation
|June 21, 2012
PubMed
Summary

Synchrotron radiation alters mineral interfaces, transforming calcite into calcium oxide and strengthening ethanol bonding. This finding establishes experimental time limits for fluid-mineral interface studies.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Mineral Physics

Background:

  • Understanding fluid-mineral interfaces is crucial for geochemistry and biomineralization.
  • Synchrotron radiation is a powerful tool for studying these interfaces, but its effects must be understood.
  • Ethanol serves as a model organic molecule with hydroxyl (OH) groups relevant to biological systems.

Purpose of the Study:

  • To investigate chemical alterations at the calcite-ethanol interface induced by synchrotron radiation.
  • To determine the impact of radiation on mineral surface transformation and organic molecule adsorption.
  • To establish experimental time constraints for synchrotron studies on fluid-mineral interfaces.

Main Methods:

  • Utilized X-ray reflectivity and X-ray photoelectron spectroscopy.
  • Studied natural calcite cleaved in distilled ethanol to create clean interfaces.
  • Compared radiated and non-radiated areas on the same samples to isolate radiation effects.

Main Results:

  • The top two atomic layers of calcite (CaCO(3)) transformed into calcium oxide (CaO) with CO(2) release within 5 hours.
  • Hydrogen bonding of ethanol to the calcite surface nearly doubled in the first ordered layer.
  • Observed radiation-induced changes, distinct from aging effects.

Conclusions:

  • Synchrotron radiation significantly alters the calcite-ethanol interface, impacting mineral composition and organic layer structure.
  • The findings provide critical time limits for synchrotron experiments involving fluid-mineral interfaces with polar OH groups.
  • This research offers insights into the behavior of organic molecules in biomineralization processes.