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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 terms-of-use 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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