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Radiation-driven rotational motion of nanoparticles

Liang, M; Harder, R; Robinson, I; (2018) Radiation-driven rotational motion of nanoparticles. Journal of Synchrotron Radiation , 25 (Part 3) pp. 757-762. 10.1107/S1600577518005039. Green open access

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Focused synchrotron beams can influence a studied sample via heating, or radiation pressure effects due to intensity gradients. The high angular sensitivity of rotational X-ray tracking of crystalline particles via their Bragg reflections can detect extremely small forces such as those caused by field gradients. By tracking the rotational motion of single-crystal nanoparticles embedded in a viscous or viscoelastic medium, the effects of heating in a uniform gradient beam and radiation pressure in a Gaussian profile beam were observed. Changes in viscosity due to X-ray heating were measured for 42 µm crystals in glycerol, and angular velocities of 10-6 rad s-1 due to torques of 10-24 N m were measured for 340 nm crystals in a colloidal gel matrix. These results show the ability to quantify small forces using rotation motion of tracer particles.

Type: Article
Title: Radiation-driven rotational motion of nanoparticles
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1107/S1600577518005039
Publisher version: http://doi.org/10.1107/S1600577518005039
Language: English
Additional information: This article is published under Creative Commons Attribution License (CC BY).
Keywords: radiation pressure, rotational X-ray tracking, rotational dynamics
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/10048259
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