Formation of BaSo4 fibres with morphological complexity in aqueous polymer solutions

L Oi, H Cölfen, M Antonietti, M Li, JD Hopwood, AJ Ashley, S Mann

Research output: Contribution to journalArticle (Academic Journal)

159 Citations (Scopus)

Abstract

BaSO4 fibres with morpho- logical complexity were formed in aque- ous solution with polyacrylate and par- tially monophosphonated poly(ethyle- neoxide)-block-poly(methacrylic acid) additives by a simple precipitation reac- tion. For polyacrylate, formation of the fibrous deposits was strongly dependent on the level of supersaturation (S) and Ba2á:polymer molar ratio (R). At Sà 60 to 80, and Rà 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 organ- ized into cone-shaped aggregates at Sà 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 con- trast, BaSO4 crystallisation in the pres- ence of a partially phosphonated block copolymer gave a high yield of BaSO4 fibres up to 100 mm in length, and consisting of co-aligned bundles of 30 nm-diameter defect-free single-crys- tal 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.

Formation of BaSO4 Fibres with Morphological Complexity in Aqueous Polymer Solutions | Request PDF. Available from: https://www.researchgate.net/publication/227984723_Formation_of_BaSO4_Fibres_with_Morphological_Complexity_in_Aqueous_Polymer_Solutions [accessed Oct 03 2018].
Original languageEnglish
Pages (from-to)3526-3532
Number of pages7
JournalChemistry - A European Journal
Volume7
DOIs
Publication statusPublished - 2001

Fingerprint Dive into the research topics of 'Formation of BaSo<sub>4</sub> fibres with morphological complexity in aqueous polymer solutions'. Together they form a unique fingerprint.

  • Cite this