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Author

  • Ahmed Shalaby (2)
  • Hans-Joachim Krause (2)
  • Ulrich Engelmann (2)
  • Carolyn Shasha (1)
  • Kannan M. Krishnan (1)
  • Mohammad Ali Pourshahidi (1)

Year of publication

  • 2022 (1)
  • 2021 (1)

Institute

  • Fachbereich Medizintechnik und Technomathematik (2)
  • INB - Institut für Nano- und Biotechnologien (1)

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Comparative modeling of frequency mixing measurements of magnetic nanoparticles using micromagnetic simulations and Langevin theory (2021)
Ulrich Engelmann ; Ahmed Shalaby ; Carolyn Shasha ; Kannan M. Krishnan ; Hans-Joachim Krause
Probing particle size dependency of frequency mixing magnetic detection with dynamic relaxation simulation (2022)
Ulrich Engelmann ; Mohammad Ali Pourshahidi ; Ahmed Shalaby ; Hans-Joachim Krause
Biomedical applications of magnetic nanoparticles (MNP) fundamentally rely on the particles’ magnetic relaxation as a response to an alternating magnetic field. The magnetic relaxation complexly depends on the interplay of MNP magnetic and physical properties with the applied field parameters. It is commonly accepted that particle core size is a major contributor to signal generation in all the above applications, however, most MNP samples comprise broad distribution spanning nm and more. Therefore, precise knowledge of the exact contribution of individual core sizes to signal generation is desired for optimal MNP design generally for each application. Specifically, we present a magnetic relaxation simulation-driven analysis of experimental frequency mixing magnetic detection (FMMD) for biosensing to quantify the contributions of individual core size fractions towards signal generation. Applying our method to two different experimental MNP systems, we found the most dominant contributions from approx. 20 nm sized particles in the two independent MNP systems. Additional comparison between freely suspended and immobilized MNP also reveals insight in the MNP microstructure, allowing to use FMMD for MNP characterization, as well as to further fine-tune its applicability in biosensing.
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