Magnetothermal Miniature Reactors Based on Fe₃ O₄ Nanocube-Coated Liquid Marbles

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Liquid marbles offer unique isolated environments but lack reliable heating mechanisms.
• Heating is crucial for many applications of liquid marbles.

Purpose of the Study:

• To develop a novel liquid marble system with a controllable and reliable heating mechanism.
• To explore the potential of these heatable liquid marbles as miniature reactors for chemical reactions.

Main Methods:

• Coating liquid marbles with iron oxide (Fe3O4) nanocubes.
• Utilizing alternating magnetic fields (AMF) for homogeneous and patterned heating.
• Investigating magnetothermal properties for selective heating.
• Demonstrating applications in temperature-dependent chemical reactions, including DNA amplification.

Main Results:

• Achieved homogeneous heating of iNLMs up to 86°C with AMF.
• Demonstrated controllable and patterned heating by tuning AMF power.
• Realized multicenter and selective heating based on magnetothermal properties.
• Successfully performed DNA amplification in iNLMs with a 25% superior rate compared to conventional thermal cyclers.

Conclusions:

• Fe3O4 nanocube-coated liquid marbles (iNLMs) provide a feasible and delicate magnetothermal miniature reactor.
• This technology offers a reliable method for applying liquid marbles in biosensing, point-of-care testing, and theranostics.