Interaction of ethanol and water with the {1014} surface of calcite
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Interaction of ethanol and water with the {1014} surface of calcite. / Cooke, David; Gray, R J; Sand, K K; Stipp, S L S; Elliott, J A.
In: Langmuir, Vol. 26, No. 18, 21.09.2010, p. 14520-9.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Interaction of ethanol and water with the {1014} surface of calcite
AU - Cooke, David
AU - Gray, R J
AU - Sand, K K
AU - Stipp, S L S
AU - Elliott, J A
PY - 2010/9/21
Y1 - 2010/9/21
N2 - Molecular dynamics simulations have been used to model the interaction between ethanol, water, and the {1014} surface of calcite. Our results demonstrate that a single ethanol molecule is able to form two interactions with the mineral surface (both Ca-O and O-H), resulting in a highly ordered, stable adsorption layer. In contrast, a single water molecule can only form one or other of these interactions and is thus less well bound, resulting in a more unstable adsorption layer. Consequently, when competitive adsorption is considered, ethanol dominates the adsorption layer that forms even when the starting configuration consists of a complete monolayer of water at the surface. The computational results are in good agreement with the results from atomic force microscopy experiments where it is observed that a layer of ethanol remains attached to the calcite surface, decreasing its ability to interact with water and for growth at the {1014} surface to occur. This observation, and its corresponding molecular explanation, may give some insight into the ability to control crystal form using mixtures of different organic solvents.
AB - Molecular dynamics simulations have been used to model the interaction between ethanol, water, and the {1014} surface of calcite. Our results demonstrate that a single ethanol molecule is able to form two interactions with the mineral surface (both Ca-O and O-H), resulting in a highly ordered, stable adsorption layer. In contrast, a single water molecule can only form one or other of these interactions and is thus less well bound, resulting in a more unstable adsorption layer. Consequently, when competitive adsorption is considered, ethanol dominates the adsorption layer that forms even when the starting configuration consists of a complete monolayer of water at the surface. The computational results are in good agreement with the results from atomic force microscopy experiments where it is observed that a layer of ethanol remains attached to the calcite surface, decreasing its ability to interact with water and for growth at the {1014} surface to occur. This observation, and its corresponding molecular explanation, may give some insight into the ability to control crystal form using mixtures of different organic solvents.
KW - Calcium Carbonate
KW - Ethanol
KW - Microscopy, Atomic Force
KW - Models, Molecular
KW - Molecular Conformation
KW - Reproducibility of Results
KW - Surface Properties
KW - Water
U2 - 10.1021/la100670k
DO - 10.1021/la100670k
M3 - Journal article
C2 - 20795691
VL - 26
SP - 14520
EP - 14529
JO - Langmuir
JF - Langmuir
SN - 0743-7463
IS - 18
ER -
ID: 33248242