Details
| Original language | English |
|---|---|
| Pages (from-to) | 15358-15365 |
| Number of pages | 8 |
| Journal | NANOSCALE |
| Volume | 16 |
| Issue number | 32 |
| Early online date | 29 Jul 2024 |
| Publication status | Published - 2024 |
Abstract
Unlike conventional colloids showing random mobility because of Brownian motion, active colloids contain nanomotors that translate chemical or physical triggers into directed movement. Whereas the acceleration of such particles works well, it is difficult to decelerate them by request. Compared to the existing literature on microscaled swimmers/robots, the main question of the current paper is whether nanoscaled colloids (<100 nm) can also be actively controlled despite the stronger relevance of rotational diffusion at such dimensions. We developed nanoparticles comprising two independent mechanisms for propulsion: a chemical engine associated with a Janus-type modification of organosilica nanoparticles and physical locomotion because of a superparamagnetic core inside these particles. Both triggers can be used independently to initiate the particles’ directed and anisotropic movement. The magnetic forces can be tuned, most importantly concerning the angle defining the chemical acceleration. Superposition and a boost state are adopted for a parallel alignment. However, when the magnetic field acting on the particles is turned to an antiparallel orientation, a rapid deceleration can be observed, and the colloids halt.
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In: NANOSCALE, Vol. 16, No. 32, 2024, p. 15358-15365.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Accelerating and breaking adaptive nano-colloids (<100 nm) into unsteady state operation via push-pull effects
AU - Lanz, Cornelia
AU - Künnecke, Nele
AU - Krysiak, Yaşar
AU - Polarz, Sebastian
N1 - Publisher Copyright: © 2024 The Royal Society of Chemistry.
PY - 2024
Y1 - 2024
N2 - Unlike conventional colloids showing random mobility because of Brownian motion, active colloids contain nanomotors that translate chemical or physical triggers into directed movement. Whereas the acceleration of such particles works well, it is difficult to decelerate them by request. Compared to the existing literature on microscaled swimmers/robots, the main question of the current paper is whether nanoscaled colloids (<100 nm) can also be actively controlled despite the stronger relevance of rotational diffusion at such dimensions. We developed nanoparticles comprising two independent mechanisms for propulsion: a chemical engine associated with a Janus-type modification of organosilica nanoparticles and physical locomotion because of a superparamagnetic core inside these particles. Both triggers can be used independently to initiate the particles’ directed and anisotropic movement. The magnetic forces can be tuned, most importantly concerning the angle defining the chemical acceleration. Superposition and a boost state are adopted for a parallel alignment. However, when the magnetic field acting on the particles is turned to an antiparallel orientation, a rapid deceleration can be observed, and the colloids halt.
AB - Unlike conventional colloids showing random mobility because of Brownian motion, active colloids contain nanomotors that translate chemical or physical triggers into directed movement. Whereas the acceleration of such particles works well, it is difficult to decelerate them by request. Compared to the existing literature on microscaled swimmers/robots, the main question of the current paper is whether nanoscaled colloids (<100 nm) can also be actively controlled despite the stronger relevance of rotational diffusion at such dimensions. We developed nanoparticles comprising two independent mechanisms for propulsion: a chemical engine associated with a Janus-type modification of organosilica nanoparticles and physical locomotion because of a superparamagnetic core inside these particles. Both triggers can be used independently to initiate the particles’ directed and anisotropic movement. The magnetic forces can be tuned, most importantly concerning the angle defining the chemical acceleration. Superposition and a boost state are adopted for a parallel alignment. However, when the magnetic field acting on the particles is turned to an antiparallel orientation, a rapid deceleration can be observed, and the colloids halt.
UR - http://www.scopus.com/inward/record.url?scp=85200405393&partnerID=8YFLogxK
U2 - 10.1039/d4nr01644k
DO - 10.1039/d4nr01644k
M3 - Article
C2 - 39087938
AN - SCOPUS:85200405393
VL - 16
SP - 15358
EP - 15365
JO - NANOSCALE
JF - NANOSCALE
SN - 2040-3364
IS - 32
ER -