by Keyword: Hollow mesoporous silica nanoparticles

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Ma, X., Jannasch, A., Albrecht, U. R., Hahn, K., Miguel-López, A., Schäffer, E., Sánchez, S., (2015). Enzyme-powered hollow mesoporous Janus nanomotors Nano Letters , 15, (10), 7043-7050

The development of synthetic nanomotors for technological applications in particular for life science and nanomedicine is a key focus of current basic research. However, it has been challenging to make active nanosystems based on biocompatible materials consuming nontoxic fuels for providing self-propulsion. Here, we fabricate self-propelled Janus nanomotors based on hollow mesoporous silica nanoparticles (HMSNPs), which are powered by biocatalytic reactions of three different enzymes: catalase, urease, and glucose oxidase (GOx). The active motion is characterized by a mean-square displacement (MSD) analysis of optical video recordings and confirmed by dynamic light scattering (DLS) measurements. We found that the apparent diffusion coefficient was enhanced by up to 83%. In addition, using optical tweezers, we directly measured a holding force of 64 ± 16 fN, which was necessary to counteract the effective self-propulsion force generated by a single nanomotor. The successful demonstration of biocompatible enzyme-powered active nanomotors using biologically benign fuels has a great potential for future biomedical applications.

Keywords: Enzyme, Hollow mesoporous silica nanoparticles, Hybrid motors, Janus particles, Nanomotors, Optical tweezers