Abstract
The use of image analysis as a means of measuring the dimensions of bubbles produced using a range of alginate raft formulations is described. Raft-forming mixes containing three sodium alginate samples (LFR 5/60, LF 120M and LF 10/40RB) were prepared, using sodium and potassium bicarbonate as gas-generating agents, and calcium and zinc carbonates as sources of divalent cations. The perimeters, areas and mean diameters of the bubbles were ascertained and an index described whereby the sphericity of the bubbles may be quantified. Systems produced using LFR 5/60 were found to produce the largest bubbles overall. Comparison with rheological studies indicated that this alginate sample produced the lowest viscosity mixes, suggesting a correlation between the viscosity of the medium in which the bubbles form and the subsequent bubble size.
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