Pattern-distortion technique: using liquid-lens magnification to extract volumes of individual droplets or bubbles within evaporating two-dimensional arrays

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Kilbride, J.J. ORCID: 0000-0002-3699-6079, Fagg, K.E., Ouali, F.F. ORCID: 0000-0002-6530-6786 and Fairhurst, D.J. ORCID: 0000-0001-5311-0762, 2023. Pattern-distortion technique: using liquid-lens magnification to extract volumes of individual droplets or bubbles within evaporating two-dimensional arrays. Physical Review Applied, 19 (4): 044030. ISSN 2331-7019

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Official URL: https://doi.org/10.1103/physrevapplied.19.044030

Abstract

We present an experimental "Pattern Distortion" technique which connects the shape of a liquid lens to its magnification. We demonstrate how to optimise the technique for arbitrary droplet sizes and optical configurations, and demonstrate its widespread utility in three distinct situations. Firstly we consider multiple sessile droplets. Although ubiquitous in nature, understanding of their complex interactions is limited, partly due to experimental limitations in determining individual droplet volumes for arbitrary configurations. We use the Pattern Distortion technique to overcome these limitations and find excellent agreement between our experimental data and three recent theoretical models. Secondly, we show how our technique can be used to inform the design of liquid lenses and thirdly we extend the method to composite droplets systems, using it to extract the size of an air bubble trapped inside a liquid droplet.

Item Type:

Journal article

Publication Title:

Physical Review Applied

Creators:

Kilbride, J.J., Fagg, K.E., Ouali, F.F. and Fairhurst, D.J.

Publisher:

American Physical Society (APS)

Date:

April 2023

Volume:

Number: