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Formation of BaSO4 Fibres with Morphological Complexity in Aqueous Polymer Solutions

Qi, Limin, Cölfen, Helmut, Antonietti, Markus, Li, Mei, Hopwood, Jeremy D., Ashley, Alexandra J. and Mann, Stephen (2001) Formation of BaSO4 Fibres with Morphological Complexity in Aqueous Polymer Solutions. Chemistry - A European Journal, 7 (16). p. 3526. ISSN 0947-6539

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Abstract

BaSO4 fibres with morphological complexity were formed in aqueous solution with polyacrylate and partially monophosphonated poly(ethyleneoxide)-block-poly(methacrylic acid) additives by a simple precipitation reaction. For polyacrylate, formation of the fibrous deposits was strongly dependent on the level of supersaturation (S) and Ba2+:polymer molar ratio (R). At S=60 to 80, and R=3 to 14, highly anisotropic crystalline fibres consisting of bundles of BaSO4 nanofilaments were formed after several weeks, although the yield was low. The nanofilaments were also organized into cone-shaped aggregates at S=80, and at lower R values these formed higher-order structures that consisted of multiple cone-on-cone assemblies with remarkable self-similarity. Increasing the supersaturation produced ovoid or cross-shaped dendritic particles for the range of molar ratios studied. In contrast, BaSO4 crystallisation in the presence of a partially phosphonated block copolymer gave a high yield of BaSO4 fibres up to 100 μm in length, and consisting of co-aligned bundles of 30 nm-diameter defect-free single-crystal nanofilaments with a uniform growth tip. A model for the defect-free growth of BaSO4 nanofilaments in aqueous polymer solutions based on amorphous precursor particles, vectorially directing forces and van der Waals attraction is proposed.

Item Type: Article
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Schools: School of Applied Sciences
Related URLs:
Depositing User: Jeremy Hopwood
Date Deposited: 05 Dec 2016 15:07
Last Modified: 05 Dec 2016 15:07
URI: http://eprints.hud.ac.uk/id/eprint/30595

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