Effects of size and anisotropy of magnetic nanoparticles associated with dynamics of easy axis for magnetic particle imaging

Ota, Satoshi; Matsugi, Yuki; Nakamura, T.; Takeda, Ryoji; Takemura, Yasushi; Kato, Ichiro; Nohara, Satoshi; Sasayama, Teruyoshi; Yonetani, Takashi; Enpuku, Keiji

doi:10.1016/j.jmmm.2018.11.043

Cited by 31 publications

(16 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The local magnetic field is nonetheless strongly modified by aggregation, an effect which has been recognized quite early to further enhance the rate of transverse spin relaxation of nearby water molecules for instance [27][28][29][30] . An efficient implementation of NPs in applications is consequently strongly related not only to their saturation magnetization -an active research field in synthetic inorganic chemistry -but also to the magnetic properties of NPs, which has been shown to be impacted by the degree of clustering 22,[31][32][33][34][35] , or the formation of controlled multicore particulate architectures [36][37][38] . The characterization of the local magnetic field generated by either individual or few interacting NPs (hereafter referred to as clusters) is, therefore, also of great interest.…”

Section: Introductionmentioning

confidence: 99%

Magnetic force fields of isolated small nanoparticle clusters

et al. 2020

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Magnetic force fields of isolated small nanoparticle clusters

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The magnetic core diameters and anisotropy constants of MNPs and MNP@Au were estimated from a numerical simulation using Landau-Lifshitz-Gilbert (LLG) equation. The differential equation of the magnetization is given by 21,22,23 :…”

Section: Numerical Simulationmentioning

confidence: 99%

Dynamic magnetic characterization and magnetic particle imaging enhancement of magnetic-gold core–shell nanoparticles

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…Ota et al worked on harmonic signals and measured them with respect to different MNPs structures to examine the key effects of particle structures on magnetization harmonics. A dependency between core size and anisotropy of MNPs and harmonics was observed in their work [26].…”

Section: Introductionmentioning

confidence: 80%

Heat and mass transfer in the hyperthermia cancer treatment by magnetic nanoparticles

2021

View full text Add to dashboard Cite

In this study, a more precise and cost-effective method is used for studying the drug delivery and distribution of magnetic nanoparticles in fluid hyperthermia cancer treatment, and numerical methods are employed to determine the effect of blood circulation on heat transfer and estimate the success of cancer treatment. A combination of numerical, analytical, and experimental researches is being conducted, which illustrates the essential role of numerical methods in medical and biomedical science. Magnetic NanoParticles' distribution and effects of infusion rate on the treatment are also discussed by considering the real distribution of MNPs. To increase accuracy and reduce costs in the in-vitro section, direct cutting and image processing methods are used instead of MRI. Based on the results of this section, with a tenfold increase in the infusion rate (4 μl/ min to 40 μl/min), the penetration depth increases by 1 mm, which represents a nearly 17 percent increase. Concentrations of MNPs also decrease significantly at higher infusion rates. The simulations of heat transfer reveal that maximum temperatures occur at the lowest infusion rate (1.25 μl/min), and blood flow also has a significant effect on heat transfer. With an increase in the infusion rate, necrosis tissue recedes from the tumor center and approaches the border between the tumor and healthy tissue. Results also show that, in lower MNPs' concentrations, higher infusion rates result in better treatment even though minimum infusion rates are suggested to be the best rates to facilitate distribution and treatment.

show abstract

Effects of size and anisotropy of magnetic nanoparticles associated with dynamics of easy axis for magnetic particle imaging

Cited by 31 publications

References 37 publications

Magnetic force fields of isolated small nanoparticle clusters

Magnetic force fields of isolated small nanoparticle clusters

Dynamic magnetic characterization and magnetic particle imaging enhancement of magnetic-gold core–shell nanoparticles

Heat and mass transfer in the hyperthermia cancer treatment by magnetic nanoparticles

Contact Info

Product

Resources

About