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Updated: Jan 3, 2026

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation

Published on: August 28, 2017

Contactless sensing of liquid marbles for detection, characterisation & computing.

Thomas C Draper¹, Neil Phillips¹, Roshan Weerasekera²

¹Unconventional Computing Laboratory, University of the West of England, Bristol, BS161QY, UK. Tom.Draper@uwe.ac.uk.

|November 29, 2019

Summary

A novel contactless sensor accurately characterizes liquid marbles (LMs) by measuring their impedance. This technology enables non-invasive determination of LM properties like particle size, core concentration, and volume, advancing microfluidic applications.

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Last Updated: Jan 3, 2026

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation

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Published on: August 28, 2017

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Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers

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Published on: September 4, 2015

Area of Science:

Materials Science
Electrical Engineering
Chemical Engineering

Background:

Liquid marbles (LMs) are versatile droplets with applications in microfluidics, microreactors, and sensors.
Current LM characterization methods can be invasive or lack precision.
Automated LM generation necessitates reliable characterization techniques.

Purpose of the Study:

To develop a novel contactless sensor for characterizing liquid marbles.
To enable non-invasive measurement of key LM parameters.
To provide a scalable and cost-effective solution for LM analysis.

Main Methods:

A printed circuit board (PCB) sensor with a comb-like structure of 36 interlacing electrical traces was designed and fabricated.
The sensor measures the inherent impedance (resistance, capacitance, inductance) of LMs.
Liquid marbles were analyzed under static and dynamic conditions.

Main Results:

The sensor accurately determines LM particle coating size, core concentration (NaCl), and volume.
Precise LM positioning was achieved using the comb-like sensor structure.
Measured LM capacitance (0.10 pF) closely matched the calculated value (0.12 pF).
The sensor demonstrated efficacy under both static and dynamic conditions.

Conclusions:

The developed contactless sensor offers a cheap, scalable, and easy-to-use method for LM characterization.
This technology facilitates non-invasive analysis of LM properties, crucial for microfluidic and sensing applications.
The sensor's ability to determine LM parameters and position advances the field of liquid marble technology.