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A Study of the Use of Novel Self-ordering Functionalized Polymers to Control Crystal Growth

Published online by Cambridge University Press:  01 February 2011

Brigid R. Heywood  and
Adam C. D. Ovens
Brigid R. Heywood
Affiliation:
[email protected], Open University, Chemistry, Walton Hall, Open University, Milton Keynes, N/A, MK7 6AA, United Kingdom, 44 1908 654860, 44 1908 655477
Adam C. D. Ovens
Affiliation:
[email protected], Open University, Chemistry, Walton Hall, Milton Keynes, N/A, MK7 6AA, United Kingdom
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Abstract

In this research, the ability of a series of novel oligomeric organic species to control crystal nucleation and growth of inorganic crystals was investigated. The issues under consideration were (i) the relative balance of hydrophobicity and hydrophilicity which might be programmed into a polymer; (ii) the impact metal binding, or bridging on its activity in a crystallization reaction; (iii) the mode of self organisation. An homologous series of alkyl substituted sulphonated calixarenes were used to probe these issues.The ability of a metal cation to either bridge adjacent calix[4]arenes or to adsorb into the molecular cavity had an impact upon the interaction of these molecules with the nascent crystals; selective and specific adsorption behaviours were revealed by the expression of smooth well defined new faces in the equilibrium morphology of the crystals. When the hydrophobicity index was high (increased molecular weight of alkyl substituent) these compounds segregated at the gas/liquid interface and, as a consequence of cation-induced ordering, were able to induce the oriented nucleation of crystals. When the metal ion was preferentially adsorbed into the molecular cavity the complex induced twinning in the crystal form. These studies have revealed that, in contrast to earlier studies which argued for the only for an epitaxial relationship between the polymer and crystal, a tunable range of several chemical characteristics can be programmed into a polymeric substrates if they are to be used to control nucleation and growth.

Keywords

biomimetic (assembly)crystal growthself-assembly
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 923: Symposium V – Structure and Dynamics of Charged Macromolecules at Solid-Liquid Interfaces , 2006 , 0923-V05-09
Copyright
Copyright © Materials Research Society 2006

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