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Title: Production of O/W emulsions using SPG membranes, ceramic α-aluminium oxide membranes, microfluidizer and a silicon microchannel plate - a comparative study
Authors: Vladisavljevic, Goran T.
Lambrich, Uwe
Nakajima, Mitsutoshi
Schubert, Helmar
Keywords: Membrane emulsification
Microchannel emulsification
SPG membrane
Oil-in-water emulsions
Microfluidizer
Issue Date: 2004
Publisher: © Elsevier B.V.
Citation: VLADISAVLJEVIC, G.T. ... et al., 2004. Production of O/W emulsions using SPG membranes, ceramic α-aluminium oxide membranes, microfluidizer and a silicon microchannel plate - a comparative study. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 232 (2-3), pp. 199 - 207.
Abstract: O/W emulsions consisting of rapeseed oil as the dispersed phase and 2 wt.% Tween 80 dissolved in demineralized water as the continuous phase were prepared by using different emulsification methods, such as membrane emulsification (ME) with Shirasu porous glass (SPG) and α-aluminium oxide (α-Al2O3) membranes, microfluidization (MF) and microchannel (MC) emulsification. The influence of operating conditions and membrane structure on the emulsification process and the emulsion properties was investigated and compared. Under the same conditions and for the same pore size, the SPG membrane enabled to obtain more uniform droplets (span=0.26–0.45) than α-Al2O3 membrane. However, the span of the droplet size distribution of 0.51–0.59 for the α-Al2O3 membrane at the wall shear stress of 8 Pa and the dispersed phase flux up to 9 l m−2 h−1 was significantly smaller than that reported elsewhere for the same membrane type, which was due to careful membrane cleaning by ultrasonication. The calculated maximum proportion of active pores for unhindered droplet growth was higher for the α-Al2O3 than for SPG membrane, due to the smaller porosity and smaller mean droplet/pore size ratio for the α-Al2O3 membrane. At the same Δptm/pcap ratio, the actual proportion of active pores was also higher for this membrane, due to the smaller thickness of active layer. The microfluidization is a suitable method for producing O/W emulsions with a very small mean droplet sizes of 0.085–0.30 μm, that cannot be attained by membrane or microchannel emulsification. However, the span of the droplet size distribution was in the range between 0.91 and 2.7.
Description: This article was published in the journal, Colloids and Surfaces A: Physicochemical and Engineering Aspects [© Elsevier B.V.] and the definitive version is available at: http://dx.doi.org/10.1016/j.colsurfa.2003.10.026
Version: Accepted for publication
DOI: 10.1016/j.colsurfa.2003.10.026
URI: https://dspace.lboro.ac.uk/2134/10567
Publisher Link: http://dx.doi.org/10.1016/j.colsurfa.2003.10.026
ISSN: 0927-7757
Appears in Collections:Published Articles (Chemical Engineering)

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