Dysprosium-doped iron oxide nanoparticles boosting spin–spin relaxation: a computational and experimental study

Yin, Jinchang; Xu, Feihong; Qu, Hongbin; Li, Chaorui; Liu, Shiyi; Liu, Lizhi; Shao, Yuanzhi

doi:10.1039/c9cp00463g

Cited by 16 publications

(8 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A similar decay in transverse relaxation rate has also been reported by Noginova et al [82]. The spin-spin relaxation time varies with the inverse second power (T S ∝ r −2 , where r is the particle radius) of the SPM particles size as suggested by Yin et al [83]. The relaxation time for sample A is 37.2779 × 10 12 s; it increases to 42.8301 × 10 12 s for sample D as shown in Table 4 and Figure 12b.…”

Section: Size Distribution Using Small-angle X-ray Scattering Measurementsupporting

confidence: 83%

Facile Synthesis, Static, and Dynamic Magnetic Characteristics of Varying Size Double-Surfactant-Coated Mesoscopic Magnetic Nanoparticles Dispersed Stable Aqueous Magnetic Fluids

et al. 2021

View full text Add to dashboard Cite

The present work reports the synthesis of a stable aqueous magnetic fluid (AMF) by dispersing double-surfactant-coated Fe3O4 magnetic nanoparticles (MNPs) in water using a facile ambient scalable wet chemical route. MNPs do not disperse well in water, resulting in low stability. This was improved by dispersing double-surfactant (oleic acid and sodium oleate)-coated MNPs in water, where cross-linking between the surfactants improves the stability of the AMFs. The stability was probed by rheological measurements and all the AMF samples showed a good long-term stability and stability against a gradient magnetic field. Further, the microwave spin resonance behavior of AMFs was studied in detail by corroborating the experimental results obtained from the ferromagnetic resonance (FMR) technique to theoretical predictions by appropriate fittings. A broad spectrum was perceived for AMFs which indicates strong ferromagnetic characteristics. The resonance field shifted to higher magnetic field values with the decrease in particle size as larger-size MNPs magnetize and demagnetize more easily since their magnetic spins can align in the field direction more definitely. The FMR spectra was fitted to obtain various spin resonance parameters. The asymmetric shapes of the FMR spectra were observed with a decrease in particle sizes, which indicates an increase in relaxation time. The relaxation time increased with a decrease in particle sizes (sample A to D) from 37.2779 ps to 42.8301 ps. Further, a detailed investigation of the structural, morphological, and dc magnetic properties of the AMF samples was performed. Room temperature dc magnetic measurements confirmed the superparamagnetic (SPM) characteristics of the AMF and the M-H plot for each sample was fitted with a Langevin function to obtain the domain magnetization, permeability, and hydrodynamic diameter of the MNPs. The saturation magnetization and coercivity of the AMF samples increased with the increase in dispersed MNPs’ size of the samples. The improvement in the stability and magnetic characteristics makes AMFs suitable candidates for various biomedical applications such as drug delivery, magnetic fluid hyperthermia, and biomedicines.

show abstract

Section: Size Distribution Using Small-angle X-ray Scattering Measurementsupporting

confidence: 83%

Facile Synthesis, Static, and Dynamic Magnetic Characteristics of Varying Size Double-Surfactant-Coated Mesoscopic Magnetic Nanoparticles Dispersed Stable Aqueous Magnetic Fluids

et al. 2021

View full text Add to dashboard Cite

show abstract

“…For Dy 3+ doped iron oxide nanostructures, both increment and decrement in M S at 300 K have been reported.. [62,[98][99][100]169,170] However, for Dy 3+ doped iron oxide flower-like nanoclusters, a consistent rise in M S from 40 to 80 emu g -1 was observed when the doping of Dy 3+ was increased from 2.7 to 7 mol%, [62] which bears testimony to the fact that shape anisotropy may play a critical role in enhancing the magnetization (Figure 5F). It is strongly believed that due to the relatively large exchange 3d-4f interaction of RE elements, the incorporation of RE ions into iron oxide nanostructures could enhance the spin-orbit coupling, thus reducing the disordering of the nanoparticles, leading to relatively higher saturation magnetization.…”

Section: The Effect Of Re Doping On Magnetic Propertiesmentioning

confidence: 93%

Rare‐Earth Doped Iron Oxide Nanostructures for Cancer Theranostics: Magnetic Hyperthermia and Magnetic Resonance Imaging

Laha

Thorat

Singh

et al. 2021

Small

View full text Add to dashboard Cite

He received his Ph.D. degree in materials sciences from the University of South Australia and his research primarily focuses on carbon capture using nanoporous materials. He has published 39 articles including review and research articles in high-quality materials science-based journals including Chemical Society Reviews and Advanced Materials. His contribution to the research has been acknowledged in the form of 1580 google scholar citations with an h-index of 18.

show abstract

“…Particles smaller than 7 nm are rapidly excreted through the kidney glomerulus preventing long term toxicity issues and <100 nm is desirable to avoid uptake by the reticuloendothelial system [ 81 ]. Nanoparticulate systems possess, in general, an ability to passively target tumour cells through the enhanced permeability and retention (EPR) effect.…”

Section: Magnetic Resonance Imagingmentioning

confidence: 99%

Mesoporous Silica Nanoparticles in Bioimaging

2020

View full text Add to dashboard Cite

A biomedical contrast agent serves to enhance the visualisation of a specific (potentially targeted) physiological region. In recent years, mesoporous silica nanoparticles (MSNs) have developed as a flexible imaging platform of tuneable size/morphology, abundant surface chemistry, biocompatibility and otherwise useful physiochemical properties. This review discusses MSN structural types and synthetic strategies, as well as methods for surface functionalisation. Recent applications in biomedical imaging are then discussed, with a specific emphasis on magnetic resonance and optical modes together with utility in multimodal imaging.

show abstract

Dysprosium-doped iron oxide nanoparticles boosting spin–spin relaxation: a computational and experimental study

Abstract: This study combines the first-principle calculation and experimental investigation to unveil the physical mechanism of T2-MRI relaxation enhancement of Dy-doped iron oxide nanoparticles.

Cited by 16 publications

References 45 publications

Facile Synthesis, Static, and Dynamic Magnetic Characteristics of Varying Size Double-Surfactant-Coated Mesoscopic Magnetic Nanoparticles Dispersed Stable Aqueous Magnetic Fluids

Facile Synthesis, Static, and Dynamic Magnetic Characteristics of Varying Size Double-Surfactant-Coated Mesoscopic Magnetic Nanoparticles Dispersed Stable Aqueous Magnetic Fluids

Rare‐Earth Doped Iron Oxide Nanostructures for Cancer Theranostics: Magnetic Hyperthermia and Magnetic Resonance Imaging

Mesoporous Silica Nanoparticles in Bioimaging

Contact Info

Product

Resources

About