Fabrication of ultrafine powder from eri silk through attritor and jet milling

Rajkhowa, R, Wang, L, Kanwar, J and Wang, X 2009, 'Fabrication of ultrafine powder from eri silk through attritor and jet milling', Powder Technology, vol. 191, no. 12, pp. 155-163.


Document type: Journal Article
Collection: Journal Articles

Title Fabrication of ultrafine powder from eri silk through attritor and jet milling
Author(s) Rajkhowa, R
Wang, L
Kanwar, J
Wang, X
Year 2009
Journal name Powder Technology
Volume number 191
Issue number 12
Start page 155
End page 163
Total pages 9
Publisher Elsevier S.A.
Abstract Fibroin protein derived from silk fibres has been extensively studied with exciting outcomes for a number of potential advanced biomaterial applications. However, one of the major challenges in applications lies in engineering fibroin into a desired form using a convenient production technology. In this paper, fabrication of ultrafine powder from eri silk is reported. The silk cocoons were degummed and the extracted silk fibres were then chopped into snippets prior to attritor and air jet milling. Effects of process control agents, material load and material to water ratio during attritor milling were studied. Compared to dry and dry.wet attritor milling, wet process emerged as the preferred option as it caused less colour change and facilitated easy handling. Ultrafine silk powder with a volume based particle size d(0.5) of around 700 nm could be prepared following the sequence of chopping . wet attritor milling . spray drying . air jet milling. Unlike most reported powder production methods, this method could fabricate silk particles in a short time without any pre-treatment on degummed fibre. Moreover, the size range obtained is much smaller than that previously produced using standard milling devices. Reduction in fibre tenacity either shortened the milling time even further or helped bypassing media milling to produce fine powder directly through jet milling. However, such reduction in fibre strength did not help in increasing the ultimate particle fineness. The study also revealed that particle density and particle morphology could be manipulated through appropriate changes in the degumming process.
Subject Textile Technology
Powder and Particle Technology
Keyword(s) Silk powder
Milling
Particle size
Eri silk
DOI - identifier 10.1016/j.powtec.2008.10.004
Copyright notice © 2008 Elsevier B.V.
ISSN 0032-5910
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