Europium-doped gadolinium sulfide nanoparticles as a dual-mode imaging agent for T1-weighted MR and photoluminescence imaging

Jung, Ji‐Yeon; Kim, Mi Ae; Cho, Jee-Hyun; Lee, Seung-Jae; Yang, Inho; Cho, Janggeun; Kim, Seong Keun; Lee, Chulhyun; Park, Joung Kyu

doi:10.1016/j.biomaterials.2012.04.059

Cited by 49 publications

(32 citation statements)

References 43 publications

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“…For the EuS NP system, enhanced or modulated physical characteristics, such as the magnetization18273435363738394041, Curie/Neel temperature1836373940, Verdet constant4142, or absorption/luminescence/birefringence spectra43444546, are observed compared to their bulk counterparts, often due to the contribution of uncompensated surface spins to the net properties (magnetization, for example) of the NP. Indeed, this has been observed when the nanocrystals' average diameter approaches a critical size183540414449.…”

Section: Discussionmentioning

confidence: 99%

“…As the size of EuS NPs is reduced to the nanoscale regime, the surface-to-volume ratio increase significantly and a bimodal magnetization state formed by surface spins and core spins, under certain temperature and field conditions, can be obtained18474849. Such characteristics could lead to a variety of nanomaterials applications, which could supplant those based on bulk EuS or on other magnetic materials36394145. The anisotropy energy of the three-dimensionally confined homogeneous EuS NP system is primarily attributed to the surface atoms, i.e., the anisotropy constant of the core atoms is assumed to be negligible.…”

Section: Discussionmentioning

confidence: 99%

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Physical Justification for Negative Remanent Magnetization in Homogeneous Nanoparticles

Zhang

et al. 2014

Sci Rep

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The phenomenon of negative remanent magnetization (NRM) has been observed experimentally in a number of heterogeneous magnetic systems and has been considered anomalous. The existence of NRM in homogenous magnetic materials is still in debate, mainly due to the lack of compelling support from experimental data and a convincing theoretical explanation for its thermodynamic validation. Here we resolve the long-existing controversy by presenting experimental evidence and physical justification that NRM is real in a prototype homogeneous ferromagnetic nanoparticle, an europium sulfide nanoparticle. We provide novel insights into major and minor hysteresis behavior that illuminate the true nature of the observed inverted hysteresis and validate its thermodynamic permissibility and, for the first time, present counterintuitive magnetic aftereffect behavior that is consistent with the mechanism of magnetization reversal, possessing unique capability to identify NRM. The origin and conditions of NRM are explained quantitatively via a wasp-waist model, in combination of energy calculations.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Physical Justification for Negative Remanent Magnetization in Homogeneous Nanoparticles

Zhang

et al. 2014

Sci Rep

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“…Liquid treated with ultrasound can lead to the formation, growth, and collapse of a bubble, and localized hot spots will generate with extremely high pressures and temperatures, and rapid heating and cooling rates [28][29][30][31]. Moreover, the advantages of sonochemistry have also been actively applied in many other fields [32,33].…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic-assisted synthesis of Pd–Pt/carbon nanotubes nanocomposites for enhanced electro-oxidation of ethanol and methanol in alkaline medium

Yang

Zhou

Pan

et al. 2016

Ultrasonics Sonochemistry

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Herein, a facile ultrasonic-assisted strategy was proposed to fabricate the Pd-Pt alloy/multi-walled carbon nanotubes (Pd-Pt/CNTs) nanocomposites. A good number of Pd-Pt alloy nanoparticles with an average of 3.4 ± 0.5 nm were supported on sidewalls of CNTs with uniform distribution. The composition of the Pd-Pt/CNTs nanocomposites could also be easily controlled, which provided a possible approach for the preparation of other architectures with anticipated properties. The Pd-Pt/CNTs nanocomposites were extensively studied by electron microscopy, induced coupled plasma atomic emission spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy, and applied for the ethanol and methanol electro-oxidation reaction in alkaline medium. The electrochemical results indicated that the nanocomposites had better electrocatalytic activities and stabilities, showing promising applications for fuel cells.

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“…In addition, europium-doped gadolinium sulfide (GdS:Eu 3+ ) was successfully applied as a fluorescent imaging agent for breast cancer cells (SK-BR-3). 15 In a third example, Ren et al 13 used Eu 3+ -doped GdPO 4 nanorods to observe red luminescence from labeled HeLa cells.…”

Section: Introductionmentioning

confidence: 99%

Size-Dependent MRI Relaxivity and Dual Imaging with Eu_0.2Gd_0.8PO₄·H₂O Nanoparticles

Chen

Tan

et al. 2014

Langmuir

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Three different sizes of Eu0.2Gd0.8PO4·H2O nanoparticles have been prepared to investigate the particle size influence on water proton relaxivity. Longitudinal relaxivity (r1) values increase for smaller particles, reaching as high as r1 = 6.13 mM–1 s–1 for a sample of 40 ± 4 nm particles, which, with a ratio of transverse/longitudinal relaxivity, r2/r1 = 1.27, are shown to be effective positive contrast agents. The correlation between relaxivity and the surface-to-volume ratio implies that access to surface Gd3+ sites is the principal factor affecting relaxivity. On the other hand, although ionic molar relaxivity decreases for larger particles, the relaxivity per particle can be significantly greater. Gadolinium-based nanoparticles doped with fluorescent lanthanide elements have attracted attention for their dual-imaging abilities, combining magnetic resonance imaging (MRI) and fluorescence imaging agents. In both in vitro experiments with HeLa cells and in vivo experiments with C. elegans, strong red fluorescence is observed from Eu0.2Gd0.8PO4·H2O with high resolution, demonstrating the parallel use of the particles as fluorescence imaging agents.

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Europium-doped gadolinium sulfide nanoparticles as a dual-mode imaging agent for T1-weighted MR and photoluminescence imaging

Cited by 49 publications

References 43 publications

Physical Justification for Negative Remanent Magnetization in Homogeneous Nanoparticles

Physical Justification for Negative Remanent Magnetization in Homogeneous Nanoparticles

Ultrasonic-assisted synthesis of Pd–Pt/carbon nanotubes nanocomposites for enhanced electro-oxidation of ethanol and methanol in alkaline medium

Size-Dependent MRI Relaxivity and Dual Imaging with Eu_0.2Gd_0.8PO₄·H₂O Nanoparticles

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Europium-doped gadolinium sulfide nanoparticles as a dual-mode imaging agent for T1-weighted MR and photoluminescence imaging

Cited by 49 publications

References 43 publications

Physical Justification for Negative Remanent Magnetization in Homogeneous Nanoparticles

Physical Justification for Negative Remanent Magnetization in Homogeneous Nanoparticles

Ultrasonic-assisted synthesis of Pd–Pt/carbon nanotubes nanocomposites for enhanced electro-oxidation of ethanol and methanol in alkaline medium

Size-Dependent MRI Relaxivity and Dual Imaging with Eu0.2Gd0.8PO4·H2O Nanoparticles

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Product

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About

Size-Dependent MRI Relaxivity and Dual Imaging with Eu_0.2Gd_0.8PO₄·H₂O Nanoparticles