Observation of the dynamics of magnetic nanoparticles induced by a focused laser beam by using dark-field microscopy
Source abstract
Abstract
The dynamics of Fe3O4 magnetic nanoparticles under the irradiation of a tightly focused laser beam was investigated by using a high-intensity dark-field microscopy. A depletion region of magnetic nanoparticles was found at the center of the laser beam where the dissipative force (absorption and scattering forces) dominated the dynamics of the magnetic nanoparticles. In contrast, the dynamics of magnetic nanoparticles was dominated by thermal and mass diffusions at the edge of the laser beam where the dissipative force was negligible. In addition, the transient variation in the concentration of magnetic nanoparticles was characterized by recording the transient scattering light intensity. The coefficients of thermal diffusion, mass diffusion and the Soret effect for this kind of magnetic nanoparticles were successfully extracted by using this technique.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Spectroscopy and Quantum Chemical Studies · Chemical and Physical Properties of Materials · Photochemistry and Electron Transfer Studies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (25)
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