Growth and Dissolution of Calcite in the Presence of Adsorbed Stearic Acid

Maria Ricci, Juan José Segura, Blake W. Erickson, Georg Fantner, Francesco Stellacci, Kislon Voïtchovsky

Research output: Contribution to journalArticlepeer-review

Abstract

The interaction of organic molecules with the surface of calcite plays a central role in many geochemical, petrochemical, and industrial processes and in biomineralization. Adsorbed organics, typically fatty acids, can interfere with the evolution of calcite when immersed in aqueous solutions. Here we use atomic force microscopy in liquid to explore in real-time the evolution of the (1014) surface of calcite covered with various densities of stearic acid and exposed to different saline solutions. Our results show that the stearic acid molecules tend to act as "pinning points" on the calcite's surface and slow down the crystal's restructuring kinetics. Depending on the amount of material adsorbed, the organic molecules can form monolayers or bilayer islands that become embedded into the growing crystal. The growth process can also displaces the organic molecules and actively concentrate them into stacked multilayers. Our results provide molecular-level insights into the interplay between the adsorbed fatty acid molecules and the evolving calcite crystal, highlighting mechanisms that could have important implications for several biochemical and geochemical processes and for the oil industry.

Original languageEnglish
Pages (from-to)7563-7571
Number of pages9
JournalLangmuir
Volume31
Issue number27
DOIs
Publication statusPublished - Jun 30 2015

ASJC Scopus subject areas

  • Electrochemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Materials Science(all)
  • Spectroscopy

Fingerprint Dive into the research topics of 'Growth and Dissolution of Calcite in the Presence of Adsorbed Stearic Acid'. Together they form a unique fingerprint.

Cite this