Formation of BaSO4 Fibres with Morphological Complexity in Aqueous Polymer Solutions

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2001
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Qi, Limin
Antonietti, Markus
Li, Mei
Hopwood, Jeremy D.
Ashley, Alexandra J.
Mann, Stephen
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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.

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ISO 690QI, 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. 2001, 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
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@article{Qi2001-08-17Forma-40530,
  year={2001},
  doi={10.1002/1521-3765(20010817)7:16<3526::AID-CHEM3526>3.0.CO;2-Z},
  title={Formation of BaSO<sub>4</sub> Fibres with Morphological Complexity in Aqueous Polymer Solutions},
  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}
}
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    <dcterms:abstract xml:lang="eng">BaSO&lt;sub&gt;4&lt;/sub&gt; 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&lt;sup&gt;2+&lt;/sup&gt;:polymer molar ratio (R). At S=60 to 80, and R=3 to 14, highly anisotropic crystalline fibres consisting of bundles of BaSO&lt;sub&gt;4&lt;/sub&gt; 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&lt;sub&gt;4&lt;/sub&gt; crystallisation in the presence of a partially phosphonated block copolymer gave a high yield of BaSO&lt;sub&gt;4&lt;/sub&gt; 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&lt;sub&gt;4&lt;/sub&gt; nanofilaments in aqueous polymer solutions based on amorphous precursor particles, vectorially directing forces and van der Waals attraction is proposed.</dcterms:abstract>
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