Relationship between processing, surface energy and bulk properties of ultrafine silk particles

Rajkhowa, Rangam, Kafi, Abdullah, Zhou, Qi Tony, Kondor, Anett, Morton, David A.V. and Wang, Xungai 2015, Relationship between processing, surface energy and bulk properties of ultrafine silk particles, Powder technology, vol. 270, pp. 112-120, doi: 10.1016/j.powtec.2014.10.004.

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Title Relationship between processing, surface energy and bulk properties of ultrafine silk particles
Author(s) Rajkhowa, RangamORCID iD for Rajkhowa, Rangam
Kafi, Abdullah
Zhou, Qi Tony
Kondor, Anett
Morton, David A.V.
Wang, XungaiORCID iD for Wang, Xungai
Journal name Powder technology
Volume number 270
Start page 112
End page 120
Total pages 9
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-01-01
ISSN 0032-5910
Keyword(s) Flowability
Shear stress
Surface energy
Science & Technology
Engineering, Chemical
Summary Silk particles of different sizes and shapes were produced by milling and interactions with a series of polar and non-polar gaseous probes were investigated using an inverse gas chromatography technique. The surface energy of all silk materials is mostly determined by long range dispersive interactions such as van der Waals forces. The surface energy increases and surface energy heterogeneity widens after milling. All samples have amphoteric surfaces and the concentration of acidic groups increases after milling while the surfaces remain predominantly basic. We also examined powder compression and flow behaviours using a rheometer. Increase in surface energy, surface area, and static charges in sub-micron air jet milled particles contributed to their aggregation and therefore improved flowability. However they collapse under large pressures and form highly cohesive powder. Alkaline hydrolysis resulted in more crystalline fibres which on milling produced particles with higher density, lower surface energy and improved flowability. The compressibility, bulk density and cohesion of the powders depend on the surface energy as well as on particle size, surface area, aggregation state and the testing conditions, notably the consolidated and unconsolidated states. The study has helped in understanding how surface energy and flowability of particles can be changed via different fabrication approaches.
Language eng
DOI 10.1016/j.powtec.2014.10.004
Field of Research 091299 Materials Engineering not elsewhere classified
090406 Powder and Particle Technology
030399 Macromolecular and Materials Chemistry not elsewhere classified
Socio Economic Objective 860403 Natural Fibres, Yarns and Fabrics
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2015, Elsevier
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Document type: Journal Article
Collections: Institute for Frontier Materials
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