A quantitative framework for the formation of liquid marbles and hollow granules from hydrophobic powders

Eshtiaghi, Nicky and Hapgood, Karen P. 2012, A quantitative framework for the formation of liquid marbles and hollow granules from hydrophobic powders, Powder technology, vol. 223, pp. 65-76, doi: 10.1016/j.powtec.2011.05.007.

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Title A quantitative framework for the formation of liquid marbles and hollow granules from hydrophobic powders
Author(s) Eshtiaghi, Nicky
Hapgood, Karen P.ORCID iD for Hapgood, Karen P. orcid.org/0000-0002-0402-8954
Journal name Powder technology
Volume number 223
Start page 65
End page 76
Total pages 12
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2012-06
ISSN 0032-5910
Keyword(s) liquid marble
hydrophobic granulation
dry water
hollow granule
Science & Technology
Engineering, Chemical
Summary Liquid marbles are micro reservoirs of fluid surrounded by a powder shell. Their unique properties show promise for high-value technological applications in the medical, biotechnology, chemical and pharmaceutical industries. In this study, liquid marbles were prepared from six mixtures of water and glycerol by releasing droplets from different heights onto a loosely packed powder bed using a 1. mL syringe. Pictures of the liquid marbles were taken with a stereo microscope (SMZ series) with a 3MP Motic camera. The powders used were Aerosil R202, hydrophobic glass ballotini and PTFE spheres. In this paper, our previous proposed qualitative framework for liquid marble formation via solid spreading coefficient mechanism was updated in light of recent new research and the quantitative criteria for each step was established and validated. The last step of the framework was modified to reflect the physical flow mechanism now understood to be responsible for liquid marble formation. The revised framework presents the step by step process and quantitative criteria for liquid marble formation via a preformed droplet template. In addition, new frameworks for the formation of liquid marbles via the mechanical dispersion regime and for the formation of hollow granules were also developed and validated. These frameworks give a better understanding of the mechanisms controlling the granulation of hydrophobic particles to form liquid marbles and provide guidance on how to mass produce liquid marbles and hollow granules.
Language eng
DOI 10.1016/j.powtec.2011.05.007
Field of Research 0904 Chemical Engineering
0913 Mechanical Engineering
Socio Economic Objective 0 Not Applicable
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2011, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30092943

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