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Complex interplay between the microfluidic and optical properties of Hoplia sp. beetles
Danica Pavlović1, Branislav Salatić2, Srećko Ćurčić3
1Institute of Physics, University of Belgrade, Pregrevica 118, 11080, Belgrade, Serbia. danica.pavlovic@ipb.ac.rs.
Frontiers in Zoology
|November 15, 2024
Summary
The Hoplia argentea beetle exhibits reversible color change from green to red when exposed to water. This is due to a unique micro/nano-optofluidic system in its elytra that rapidly alters coloration.
Area of Science:
- Biomimetics and nanotechnology
- Insect biology and evolution
- Optofluidics
Background:
- Photonic nanostructures in insects evolve for communication, camouflage, and thermoregulation.
- Few insect species show elytron color change due to water permeation.
- Water-induced color change in insects is a rare phenomenon.
Purpose of the Study:
- To investigate the mechanism of reversible color change in the scarabaeid beetle Hoplia argentea.
- To analyze the micro/nano-optofluidic system responsible for the color shift.
- To explore potential applications of this biological system.
Main Methods:
- Observation of color change in Hoplia argentea upon water exposure.
- Analysis of the elytron and scale micro/nano-optofluidic system.
- Development of optical models to explain coloration mechanisms.
- Investigation of superhydrophilic properties and capillary forces.
Main Results:
- Hoplia argentea shifts from green to brownish-red reversibly when exposed to water.
- Elytron and scales form an efficient micro/nano-optofluidic system for water transport.
- Capillary forces generate high pressure (approx. 15 bar) for rapid air expulsion.
- Superhydrophilic properties significantly influence the optical behavior and color change.
Conclusions:
- Hoplia argentea's color change is linked to ecological niches, aiding camouflage and thermoregulation.
- The study inspires biomimetic devices for applications like drug delivery and sensing.
- Dynamic fluid flow patterns can be utilized in security applications as physically unclonable functions (PUFs).
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