Dendritic Janus Nanomotors with Precisely Modulated Coverages and Their Effects on Propulsion

ACS Applied Materials & Interfaces
Yi XingXueji Zhang

Abstract

Asymmetric dual-function Janus micro-/nanoparticles (NPs) that have different surface modifications, structures, or material properties are extremely promising as building blocks in constructing micro-/nanomotors. However, current synthesis strategies make it usually difficult to precisely control the percentages of coverages of Janus micro-/NPs, which hinders in-depth research studies of their effects on the performance of Janus nanomotors. This study demonstrates a versatile approach for fabrication of Janus dendritic porous silica nanomotors with precisely modulated coverages from 0 to 100% by controlling the embedded depth of aminopropyl-modified dendritic porous silica NPs (DPSNs-NH2) with positive charges and subsequently adsorbing the oppositely charged Pt NPs. The diffusion coefficients of DPSNs-NH2 with different coverages of Pt NPs are systematically investigated. The propulsion can be enhanced by the improvement of catalytic activity of DPSNs, and half-coated DPSNs-NH2 exhibit highest propulsion among DPSNs-NH2 with other coverages. More importantly, compared with solid silica nanospheres, the initial increase of the coverage of DPSNs-NH2 makes more enhancements to the motion performance, which can be used to optimiz...Continue Reading

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Citations

Nov 24, 2019·Nature Communications·B Jelle ToebesDaniela A Wilson
Jan 13, 2021·Journal of Environmental Management·Saurabh ShivalkarAmaresh Kumar Sahoo
Aug 31, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Sepideh KhoeeMohammad A Charsooghi
Jan 11, 2022·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Ye YuanQiang He

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