Premium
Core@Satellite Janus Nanomotors with pH‐Responsive Multi‐phoretic Propulsion
Author(s) -
Xing Yi,
Zhou Mengyun,
Xu Tailin,
Tang Songsong,
Fu Yang,
Du Xin,
Su Lei,
Wen Yongqiang,
Zhang Xueji,
Ma Tianyi
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202006421
Subject(s) - janus , propulsion , nanotechnology , nanoparticle , chemistry , thermophoresis , materials science , aerospace engineering , nanofluid , engineering
Abstract We report core@satellite Janus mesoporous silica‐Pt@Au (JMPA) nanomotors with pH‐responsive multi‐phoretic propulsion. The JMPA nanomotors first undergo self‐diffusiophoretic propulsion in 3.0 % H 2 O 2 due to the isolation of the Au nanoparticles (AuNPs) from the PtNPs layer. Then the weak acidity of H 2 O 2 can trigger the disassembly and reassembly of the AuNPs, resulting in the Janus distribution of large AuNPs aggregates. Such reconstruction of JMPA leads to the contact between PtNPs and AuNPs aggregates, thus changing the propulsion mechanism to self‐electrophoresis. The asymmetric and aggregated AuNPs also enable the generation of a thermal gradient under laser irradiation, which propels the JMPA nanomotors by self‐thermophoresis. Such multi‐phoretic propulsion offers considerable promise for developing advanced nanomachines with a stimuli‐responsive switch of propulsion modes in biomedical applications.