Asymmetric Hybrid Silica Nanomotors for Capture and Cargo Transport: Towards a Novel Motion-Based DNA Sensor

J. Simmchen, A. Baeza, D. Ruiz, M. J. Esplandiu, M. Vallet-Regí

Small, 8, 2053 - 2059, (2012)
DOI: 10.1002/smll.201101593

http://onlinelibrary.wiley.com/doi/10.1002/smll.201101593/full

Abstract: An innovative self-propelled nanodevice able to perform motion, cargo transport, and target recognition is presented. The system is based on a mesoporous motor particle, which is asymmetrically functionalized by the attachment of single-stranded DNA onto one of its faces, while catalase is immobilized on the other face. This enzyme allows catalytic decomposition of hydrogen peroxide to oxygen and water, giving rise to the driving force for the motion of the whole system. Moreover the motor particles are able to capture and transport cargo particles functionalized with a noncomplementary single-stranded DNA molecule, only if a specific oligonucleotide sequence is present in the media. Functionalization with characteristic oligonucleotide sequences in the system implies a potential for further developments for lab-on-chip devices with applications in biomedical applications.

Asymmetric Hybrid Silica Nanomotors for Capture and Cargo Transport: Towards a Novel Motion-Based DNA Sensor
Chemically powered self-assembly device: time-lapse images for the movement in 5% hydrogen peroxide solution. a) Movement of one cargo-particle covered by motor nanoparticles and b) assembly of several cargo particles.