Liquid marble formation using hydrophobic powders
Data(s) |
15/04/2009
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Resumo |
This work aims to investigate and quantitatively measure “liquid marble” phenomena using hydrophobic powders (granules). The hydrophobic powders based on a copper substrate were prepared by a silver deposition technique of particle sizes 9 µm, 20 µm and 320 µm and of contact angle with water approaching 160°. The hydrophobic powder poly-methylmethacralate (PMMA) particle size 42 µm and contact angle of 120° was also used to determine the effect of powder density on liquid marble stability. The experimental investigations indicated that for successful formation of liquid marbles a number of variables in addition to hydrophobicity need to be considered, namely: powder density; powder particle size; powder shape; liquid marble formation technique. It was found that liquid marbles were formed using all four powders to varying extents, with a low powder particle size forming more stable liquid marbles. In a series of gravimetric tests, adhered powder mass on liquid marbles was found to be directly proportional to the water droplet surface area. A more complete coverage of the water drops were found with PMMA powder than the hydrophobic granules. Moreover, a further procedure was developed to increase the mechanical strength of the liquid marble, by polymerising methylmethacrylate (MMA) on the surface of a PMMA powder – liquid marble, with the aim of maintaining water within a more robust PMMA – liquid marble shell. This technique may prove to be a novel way of encapsulating drug compounds, such as gentamicin sulphate, for PMMA bone cement. |
Identificador |
http://dx.doi.org/10.1016/j.cej.2008.11.026 http://www.scopus.com/inward/record.url?scp=60649117327&partnerID=8YFLogxK |
Idioma(s) |
eng |
Direitos |
info:eu-repo/semantics/restrictedAccess |
Fonte |
McEleney , P , Walker , G , Larmour , I A & Bell , S 2009 , ' Liquid marble formation using hydrophobic powders ' Chemical Engineering Journal , vol 147 , no. 2-3 , pp. 373-382 . DOI: 10.1016/j.cej.2008.11.026 |
Palavras-Chave | #/dk/atira/pure/subjectarea/asjc/1500 #Chemical Engineering(all) #/dk/atira/pure/subjectarea/asjc/1600 #Chemistry(all) #/dk/atira/pure/subjectarea/asjc/2200/2209 #Industrial and Manufacturing Engineering #/dk/atira/pure/subjectarea/asjc/2300/2304 #Environmental Chemistry |
Tipo |
article |