English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Many characterization techniques for magnetic nanoparticles depend on theusage of external fields. This is not the case in Thermal Noise Magnetometry(TNM), where thermal fluctuations in the magnetic signal of magneticnanoparticle ensembles are measured without any external excitation. This canprovide valuable information about the fundamental dynamical properties of theparticles, due to the purely observative experiments of this relatively newtechnique. Until now, TNM signals have been detected only by a superconductingquantum interference device (SQUID) sensor. We present a tabletop setup usingOptically Pumped Magnetometers (OPMs) in a small magnetic shield, offering aflexible and accessible alternative and show the agreement between bothmeasurement systems for two different commercially available nanoparticlesamples. We argue that the OPM setup with high accessibility complements theSQUID setup with high sensitivity and bandwidth. Furthermore, because of itsexcellent sensitivity in the lower frequencies, the OPM tabletop setup is wellsuited to monitor aggregation processes where the magnetization dynamics of theparticles tend to slow down, e.g. in biological processes. As a proof ofconcept, we show for three different immobilization and clustering processesthe changes in the noise spectrum measured in the tabletop setup: 1) theaggregation of particles due to the addition of ethanol, 2) the formation ofpolymer structures in the sample due to UV exposure, and 3) the cellular uptakeof the particles by THP-1 cells. From our results we conclude that the tabletopsetup offers a flexible and widely adoptable sensor measurement unit to monitorthe immobilization and clustering of magnetic nanoparticles over time fordifferent applications.

A tabletop Optically Pumped Magnetometer setup for the monitoring of  magnetic nanoparticle clustering and immobilization using Thermal Noise  Magnetometry