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Contactless sensing of liquid marbles for detection, characterisation & computing

Draper, Thomas C.; Phillips, Neil; Weerasekera, Roshan; Mayne, Richard; Fullarton, Claire; de Lacy Costello, Benjamin; Adamatzky, Andrew

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Dr Thomas Draper
Research Fellow Biosensing/ Healthcare Technology

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Dr Neil Phillips
Research Fellow in Fungal Analog Electronics

Richard Mayne
Lecturer in Maths Supporting Science

Claire Fullarton


Liquid marbles (LMs) are of growing interest in many fields, including microfluidics, microreactors, sensors, and signal carriers. The generation of LMs is generally performed manually, although there has recently been a burst of publications involving 'automatic marble makers'. The characteristics of a LM is dependent on many things, including how it is generated, it is therefore important to be able to characterise LMs once made. Here is presented a novel contactless LM sensor, constructed on a PCB board with a comb-like structure of 36 interlacing electrical traces, 100 μm wide and 100 μm apart. This cheap, scalable, and easy to use sensor exploits the inherent impedance (comprised of the electrical resistance, capacitive reactance and inductive reactance) of different LMs. With it, parameters of a LM can be easily determined, without interfering with the LM. These parameters are (1) particle size of the LM coating, (2) the concentration of a NaCl solution used as the LM core, and (3) the volume of the LM. Additionally, due to the comb-like nature of the sensor, the accurate positioning (down to the inter-trace spacing) of the LM can be ascertained. The new sensor has been shown to work under both static and dynamic (mobile) conditions. The capacitance of a LM was recorded to be 0.10 pF, which compares well with the calculated value of 0.12 pF.

Journal Article Type Article
Acceptance Date Nov 19, 2019
Online Publication Date Nov 21, 2019
Publication Date Jan 7, 2020
Deposit Date Jan 29, 2020
Publicly Available Date Nov 22, 2020
Journal Lab on a Chip
Print ISSN 1473-0197
Electronic ISSN 1473-0189
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 20
Issue 1
Pages 136-146
Keywords Biochemistry; Bioengineering; General Chemistry; Biomedical Engineering
Public URL
Additional Information : This document is Similarity Check deposited; : Supplementary Information; : Single-blind; : Received 9 October 2019; Accepted 19 November 2019; Accepted Manuscript published 21 November 2019


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