Magnetic Field Mapping Around Individual Magnetic Nanoparticle Agglomerates Using Nitrogen‐Vacancy Centers in Diamond

Camarneiro, Filipe; Bocquel, Juanita; Gallo, Juan; Bañobre‐López, Manuel; Berg-Sørensen, Kirstine; Andersen, Ulrik L.; Huck, Alexander; Nieder, Jana B.

doi:10.1002/ppsc.202100011

Cited by 4 publications

(1 citation statement)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our fabrication protocol could be expanded for patterning other particle material compositions and even patterning of widely used molecular agents. Broadening the scope of both native and modified nanoparticles for magnetic particle imaging, 51 optically detected MR, 52 and fluorescent imaging 53 could help optimize static and dynamic image contrast, SNR, and sensitivity to analytes without sacrificing biocompatibility or resolution. Future experiments will consist of nanofabricating 2D and 3D array combinations composed of self‐assembling modules with additional geometries to confirm that our work extends to three dimensions and performing multimodal magnetic imaging of array samples implanted in vivo.…”

Section: Discussionmentioning

confidence: 99%

Direct observation of NMR transverse relaxation in nanopatterned clusters of iron oxide particles

Bok,

Rauch,

Ashtiani

et al. 2023

Magnetic Resonance in Med

View full text Add to dashboard Cite

PurposeWe aim to verify predictions showing T2 relaxation rate of nanoparticle clusters and its dependence on spacing, size, geometry, and pulse sequence.MethodsWe performed a laboratory validation study using nanopatterned arrays of iron oxide nanoparticles to precisely control cluster geometry and image diverse samples using a 4.7T MRI scanner with a T2‐weighted fast spin‐echo multislice sequence. We applied denoising and normalization to regions of interest and estimated relative R2 for each relevant nanoparticle array or nanocluster array. We determined significance using an unpaired two‐tailed t‐test or one‐way analysis of variance and performed curve fitting.ResultsWe measured a density‐dependent T2 effect (p = 8.9976 × 10−20, one‐way analysis of variance) and insignificant effect of cluster anisotropy (p = 0.5924, unpaired t‐test) on T2 relaxation. We found negative quadratic relationships (−0.0045[log τD]2–0.0655[log τD]−2.7800) for single nanoparticles of varying sizes and for clusters (−0.0045[log τD]2–0.0827[log τD]−2.3249) for diffusional correlation time τD = rp2/D. Clusters show positive quadratic relationships for large (3.8615 × 10−6 [dpp/rp]2–9.3853 × 10−5 [dpp/rp]−2.0393) and exponential relationships for small (−2.0050[dpp/rp]0.0010) clusters. Calculated R2 peak values also align well with in silico predictions (7.85 × 10−4 ms compared with 1.47 × 10−4, 4.23 × 10−4, and 5.02 × 10−4 ms for single iron oxide nanoparticles, 7.88 × 10−4 ms compared with 5.24 × 10−4 ms for nanoparticle clusters).ConclusionOur verification affirms longstanding in silico predictions and demonstrates aggregation‐dependent behavior in agreement with previous Monte Carlo simulation studies.

show abstract

Section: Discussionmentioning

confidence: 99%

Direct observation of NMR transverse relaxation in nanopatterned clusters of iron oxide particles

Bok,

Rauch,

Ashtiani

et al. 2023

Magnetic Resonance in Med

View full text Add to dashboard Cite

show abstract

Optically detected magnetic resonance study of thermal effects due to absorbing environment around nitrogen-vacancy-nanodiamond powders

Jani,

Orzechowska,

Mrózek

et al. 2024

Journal of Applied Physics

View full text Add to dashboard Cite

We implanted Fe+ ions in nanodiamond (ND) powder containing negatively charged nitrogen-vacancy (NV−) centers and studied their Raman spectra and optically detected magnetic resonance (ODMR) in various applied magnetic fields with green light (532 nm) excitation. In Raman spectra, we observed a blue shift of the NV− peak associated with the conversion of the electronic sp3 configuration to the disordered sp2 one typical for the carbon/graphite structure. In the ODMR spectra, we observed a red shift of the resonance position caused by local heating by an absorptive environment that recovers after annealing. To reveal the red shift mechanism in ODMR, we created a controlled absorptive environment around ND by adding iron-based Fe2O3 and graphitic sp2 powders to the ND suspension. This admixture caused a substantial increase in the observed shift proportional to the applied laser power, corresponding to an increase in the local temperature by 150–180 K. This surprisingly large shift is absent in non-irradiated NV-ND powders, is associated only with the modification of the local temperature by the absorptive environment of NV-NDs, and can be studied using ODMR signals of NV−.

show abstract

Strong Thermal Effects in Optically Detected Magnetic Resonances Due to Absorbing Environment Around Nv-Nanodiamond Powders

Jani,

Orzechowska,

Mrózek

et al. 2023

Preprint

View full text Add to dashboard Cite

Magnetic Field Mapping Around Individual Magnetic Nanoparticle Agglomerates Using Nitrogen‐Vacancy Centers in Diamond

Cited by 4 publications

References 35 publications

Direct observation of NMR transverse relaxation in nanopatterned clusters of iron oxide particles

Direct observation of NMR transverse relaxation in nanopatterned clusters of iron oxide particles

Optically detected magnetic resonance study of thermal effects due to absorbing environment around nitrogen-vacancy-nanodiamond powders

Strong Thermal Effects in Optically Detected Magnetic Resonances Due to Absorbing Environment Around Nv-Nanodiamond Powders

Contact Info

Product

Resources

About