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Interfacial energy of calcite-MHA/MUA self-assembled monolayers during nucleation

Published online by Cambridge University Press:  13 September 2011

Qiaona Hu ,
Mike Nielsen ,
Udo Becker  and
Jim De Yoreo
Qiaona Hu
Affiliation:
University of Michigan, Dept. of Geological Sciences, Ann Arbor, MI 48105 Molecular Foundry, Lawrence Berkeley National Lab, Berkeley, CA 94720
Mike Nielsen
Affiliation:
Molecular Foundry, Lawrence Berkeley National Lab, Berkeley, CA 94720
Udo Becker
Affiliation:
University of Michigan, Dept. of Geological Sciences, Ann Arbor, MI 48105
Jim De Yoreo
Affiliation:
Molecular Foundry, Lawrence Berkeley National Lab, Berkeley, CA 94720
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Abstract

The interfacial energies between template-directed calcite nuclei and self-assembled monolayers of 16-mercaptohexadecanoic acid (MHA) and 11-mercaptoundecanoic acid (MUA) were measured. The results reveal that (1) the MHA and MUA significantly reduce the effective surface energy of calcite from about 97 mJ/m2 in solution to about 45.3 and 52.7 mJ/m2 on MHA and MUA respectively, providing a thermodynamic basis for the strong capacity of MHA and MUA to promote calcite nuclei; and (2) the barrier to nucleation is dominated by the free energy barrier which enhances the rate of surface nucleation on MHA and MUA.

Keywords

biomimetic (assembly)self-assemblynucleation & growth
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1348: Symposium CC – Hybrid Interfaces and Devices , 2011 , mrss11-1348-cc07-02
Copyright
Copyright © Materials Research Society 2011

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References

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