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Formation of BaSO<sub>4</sub> Fibres with Morphological Complexity in Aqueous Polymer Solutions

Formation of BaSO4 Fibres with Morphological Complexity in Aqueous Polymer Solutions

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QI, Limin, Helmut CÖLFEN, Markus ANTONIETTI, Mei LI, Jeremy D. HOPWOOD, Alexandra J. ASHLEY, Stephen MANN, 2001. Formation of BaSO4 Fibres with Morphological Complexity in Aqueous Polymer Solutions. In: Chemistry - A European Journal. 7(16), pp. 3526-3532. ISSN 0947-6539. eISSN 1521-3765. Available under: doi: 10.1002/1521-3765(20010817)7:16<3526::AID-CHEM3526>3.0.CO;2-Z

@article{Qi2001-08-17Forma-40530, title={Formation of BaSO4 Fibres with Morphological Complexity in Aqueous Polymer Solutions}, year={2001}, doi={10.1002/1521-3765(20010817)7:16<3526::AID-CHEM3526>3.0.CO;2-Z}, number={16}, volume={7}, issn={0947-6539}, journal={Chemistry - A European Journal}, pages={3526--3532}, author={Qi, Limin and Cölfen, Helmut and Antonietti, Markus and Li, Mei and Hopwood, Jeremy D. and Ashley, Alexandra J. and Mann, Stephen} }

Qi, Limin Ashley, Alexandra J. Cölfen, Helmut BaSO<sub>4</sub> 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 Ba<sup>2+</sup>:polymer molar ratio (R). At S=60 to 80, and R=3 to 14, highly anisotropic crystalline fibres consisting of bundles of BaSO<sub>4</sub> 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, BaSO<sub>4</sub> crystallisation in the presence of a partially phosphonated block copolymer gave a high yield of BaSO<sub>4</sub> 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 BaSO<sub>4</sub> nanofilaments in aqueous polymer solutions based on amorphous precursor particles, vectorially directing forces and van der Waals attraction is proposed. Antonietti, Markus Mann, Stephen Li, Mei eng Mann, Stephen Cölfen, Helmut Ashley, Alexandra J. Formation of BaSO<sub>4</sub> Fibres with Morphological Complexity in Aqueous Polymer Solutions Hopwood, Jeremy D. Qi, Limin 2017-11-08T14:02:12Z Antonietti, Markus Li, Mei 2017-11-08T14:02:12Z 2001-08-17 Hopwood, Jeremy D.

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