Formation of liquid-core capsules having a thin hydrogel membrane: liquid pearls
- 3 March 2010
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Soft Matter
- Vol. 6 (11), 2484-2488
- https://doi.org/10.1039/b923783f
Abstract
We report an experimental investigation on the formation of liquid-core capsules having a thin hydrogel elastic membrane, named ‘liquid pearls’. These fish-egg-like structures are initially made of a millimetric liquid drop, aqueous or not, coated with an aqueous liquid film containing sodium alginate that gels once the double drop enters a calcium chloride bath. The creation of such pearls with a micrometer-thick membrane requires the suppression of mixing until gelling takes place. Here, we show that superimposing a two-dimensional surfactant precipitation at the interface confers a transient rigidity that can damp the shear-induced instability at impact. Based on this, pearls containing almost any type of liquid can be created. This opens the possibility to use such structures as a new tool for screening microorganism survival and growth in various three-dimensional environments.Keywords
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