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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/10152

Title: Generation of highly uniform droplets using asymmetric microchannels fabricated on a single crystal silicon plate: effect of emulsifier and oil types
Authors: Vladisavljevic, Goran T.
Kobayashi, Isao
Nakajima, Mitsutoshi
Keywords: Microchannel emulsification
Silicon microchip
Droplet generation
Monodisperse droplets
Asymmetric microchannel plate
Issue Date: 2008
Publisher: © Elsevier
Citation: VLADISAVLJEVIC, G.T., KOBAYASHI, I. and NAKAJIMA, M., 2008. Generation of highly uniform droplets using asymmetric microchannels fabricated on a single crystal silicon plate: effect of emulsifier and oil types. Powder Technology, 183 (1), pp. 37 - 45
Abstract: Uniform droplets of soybean oil, MCT (medium-chain fatty acid triglyceride) oil and n-tetradecane with a mean diameter of 26–29 μm have been generated using asilicon 24 × 24 mm microchip consisting of 23,489 asymmetric microchannels fabricated by photolitography and deep-reactive ion etching. Each microchannel consisted of a circular 10-μm diameter straight hole with a length of 70 μm and a 50 × 10 μm rectangular microslot with a depth of 30 μm. At the constant oil flux of 10 L m− 2 h− 1, the percent of active channels increased with increasing the oil viscosity and ranged from 4% for n-tetradecane to 48% for soybean oil. The size distribution span for SDS (sodium dodecyl sulphate)- and Tween 20 (polyoxyethylene (20) sorbitan monolaurate)-stabilized soybean and MCT oildroplets was 0.21–022. The ability of asymmetricmicrochannels to generate monodisperse soybean oildroplets at the very low SDS concentration of 0.01 wt.% has been demonstrated. At the SDS concentration below the CMC, the generated droplets tend to attach to the plate surface, whereas at the higher SDS concentration they detach from the plate as soon as they are formed. The agreement between the experimental and CFD (Computational Fluid Dynamics) simulation results was excellent for soybean oil and the poorest for n-tetradecane.
Description: This article was published in the journal, Powder Technology [© Elsevier]. The definitive article is available at: http://www.sciencedirect.com/science/article/pii/S0032591007005876
Version: Accepted for publication
DOI: 10.1016/j.powtec.2007.11.023
URI: https://dspace.lboro.ac.uk/2134/10152
Publisher Link: http://dx.doi.org/10.1016/j.powtec.2007.11.023
ISSN: 0032-5910
Appears in Collections:Published Articles (Chemical Engineering)

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