Self-Propelled Tubular Micromotors Powered by Hydrogen Bubbles under Mild Conditions: A Major Step toward Biological Applications with Live Cells

Le résumé fourni par la source

Polymer-based tubular micromotors, featuring an inner layer of Pt nanoparticles (PtNPs), exhibit vigorous propulsion by emitting H 2 bubbles in an aqueous ammonia borane (NH 3 BH 3 ) solution. The hydrolysis of NH 3 BH 3 on the PtNPs facilitates the continuous release of H 2 gas from the open-end terminus, driving its forward movement. Unlike conventional O 2 bubbles’ systems that rely on hydrogen peroxide (H 2 O 2 ) as fuel, these micromotors can operate in the presence of live cells within the NH 3 BH 3 medium. Consequently, micromotors functionalized with the lectin concanavalin A demonstrate the capability to capture and release Escherichia coli ( E. coli ) without inducing cell death. Remaining bacteria can be detected by using standard culture techniques. Conversely, micromotors coated with TiO 2 nanoparticles enable photosterilization of E. coli without fuel-induced damage. The self-stirring motion of the tubes enhances both bacterial capture and sterilization efficiency. These advancements obviate the necessity for H 2 O 2 as a fuel source, and pave the way for the applications of micromotors in biological contexts.

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