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Related Experiment Video

Updated: Aug 10, 2025

Forming, Confining, and Observing Microtubule-Based Active Nematics

Forming, Confining, and Observing Microtubule-Based Active Nematics

Published on: January 13, 2023

How to capture active Marangoni surfers.

Ishant Tiwari¹, P Parmananda¹

¹Department of Physics, Indian Institute of Technology - Bombay, Mumbai, Maharashtra 400076, India. ishant@iitb.ac.in.

|February 13, 2023

Summary

This summary is machine-generated.

Researchers developed a new method to capture and control interfacial surfers, like artificial boats, using micro-air-pumps. This technique reliably traps these active matter systems and releases them on demand.

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Area of Science:

Active Matter Physics
Interfacial Phenomena
Microfluidics

Background:

Interfacial surfers, including biological and artificial systems, are key components of active matter.
Soluto-capillary effects drive the motion of many artificial interfacial surfers.
Controlling the localized behavior of these surfers has been a significant challenge.

Purpose of the Study:

To propose and validate a general protocol for capturing soluto-capillary effect-driven interfacial surfers.
To demonstrate reliable trapping and release of these surfers using localized interface modification.
To investigate the mechanism behind the observed trapping phenomenon.

Main Methods:

Utilizing a micro-air-pump to create localized perturbations at the air-water interface.
Capturing interfacial surfers within the pump's region of influence (ROI).
Conducting control experiments with passive particles to validate the method's efficacy compared to mechanical herding.

Main Results:

The micro-air-pump method reliably captured interfacial surfers driven by soluto-capillary effects.
Surfers were released and resumed free exploration upon deactivation of the perturbation.
The protocol was successfully generalized to surfers fueled by different surface-active chemicals.
Control experiments showed superior performance compared to purely mechanical particle herding.

Conclusions:

A novel and effective protocol for controlling interfacial surfers has been established.
The method offers a reliable way to trap and release active matter systems at interfaces.
The findings provide insights into the mechanisms governing interfacial surfer behavior and trapping.