Binding of ethanol on calcite: the role of the OH bond and its relevance to biomineralization
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Binding of ethanol on calcite: the role of the OH bond and its relevance to biomineralization. / Sand, K K; Yang, M; Makovicky, E; Cooke, David; Hassenkam, T; Bechgaard, K; Stipp, S L S.
In: Langmuir, Vol. 26, No. 19, 05.10.2010, p. 15239-47.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Binding of ethanol on calcite: the role of the OH bond and its relevance to biomineralization
AU - Sand, K K
AU - Yang, M
AU - Makovicky, E
AU - Cooke, David
AU - Hassenkam, T
AU - Bechgaard, K
AU - Stipp, S L S
PY - 2010/10/5
Y1 - 2010/10/5
N2 - The interaction of OH-containing compounds with calcite, CaCO(3), such as is required for the processes that control biomineralization, has been investigated in a low-water solution. We used ethanol (EtOH) as a simple, model, OH-containing organic compound, and observed the strength of its adsorption on calcite relative to OH from water and the consequences of the differences in interaction on crystal growth and dissolution. A combination of atomic force microscopy (AFM) and molecular dynamics (MD) simulations showed that EtOH attachment on calcite is stronger than HOH binding and that the first adsorbed layer of ethanol is highly ordered. The strong ordering of the ethanol molecules has important implications for mineral growth and dissolution because it produces a hydrophobic layer. Ethanol ordering is disturbed along steps and at defect sites, providing a bridge from the bulk solution to the surface. The strong influence of calcite in structuring ethanol extends further into the liquid than expected from electrical double-layer theory. This suggests that in fluids where water activity is low, such as in biological systems optimized for biomineralization, organic molecules can control ion transport to and from the mineral surface, confining it to specific locations, thus providing the organism with control for biomineral morphology.
AB - The interaction of OH-containing compounds with calcite, CaCO(3), such as is required for the processes that control biomineralization, has been investigated in a low-water solution. We used ethanol (EtOH) as a simple, model, OH-containing organic compound, and observed the strength of its adsorption on calcite relative to OH from water and the consequences of the differences in interaction on crystal growth and dissolution. A combination of atomic force microscopy (AFM) and molecular dynamics (MD) simulations showed that EtOH attachment on calcite is stronger than HOH binding and that the first adsorbed layer of ethanol is highly ordered. The strong ordering of the ethanol molecules has important implications for mineral growth and dissolution because it produces a hydrophobic layer. Ethanol ordering is disturbed along steps and at defect sites, providing a bridge from the bulk solution to the surface. The strong influence of calcite in structuring ethanol extends further into the liquid than expected from electrical double-layer theory. This suggests that in fluids where water activity is low, such as in biological systems optimized for biomineralization, organic molecules can control ion transport to and from the mineral surface, confining it to specific locations, thus providing the organism with control for biomineral morphology.
KW - Adsorption
KW - Calcium Carbonate
KW - Ethanol
KW - Microscopy, Atomic Force
KW - Minerals
KW - Molecular Dynamics Simulation
U2 - 10.1021/la101136j
DO - 10.1021/la101136j
M3 - Journal article
C2 - 20812690
VL - 26
SP - 15239
EP - 15247
JO - Langmuir
JF - Langmuir
SN - 0743-7463
IS - 19
ER -
ID: 33240783