Rapid microwave-assisted synthesis of PVP-coated ultrasmall gadolinium oxide nanoparticles for magnetic resonance imaging

Vahdatkhah, Parisa; Hosseini, H.R. Madaah; Khodaei, Azin; Montazerabadi, Alireza; Irajirad, Rasoul; Oghabian, Mohamad Ali; Delavari, Hamid

doi:10.1016/j.chemphys.2015.03.007

Cited by 32 publications

(13 citation statements)

References 41 publications

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“…74 cm −1 was assigned to the symmetrical COO − mode, and N–H bending/C–H stretching vibrations of amide II . The other characteristic peak appeared at 1601.7 cm −1 corresponded to C=O stretching vibrations (belonging to amide) and overlapped with the N − H stretching band of the amide I and the peaks centred at 1033 cm −1 were attributed to the C − C stretching band . Moreover, the bands at 534 cm −1 and 637 cm −1 could be attributed to the Se − S stretching band and the disulfide stretching vibrations, respectively .…”

Section: Resultsmentioning

confidence: 95%

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Can earthworms biosynthesize highly luminescent quantum dots?

2018

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Band gap tunable cadmium selenide (CdSe) quantum dots (QDs) were synthesized within earthworms that emit in the middle of the visible spectrum. We demonstrated that this luminescence emission is a combination of the earthworm's protein and QD luminescence, such that the contribution of QDs in the luminescence was negligible. Eisenia fetida earthworms were used for QD biosynthesis and were exposed to different concentrations of CdCl and Na SeO in standard soil for an adequate exposure time. The size of the CdSe QDs based on the effective mass model was in agreement with the size measured from the transmission electron microscopy analysis, with an average diameter of 7 nm. Ultraviolet-visible and photoluminescence analyses confirmed the synthesis of CdSe QDs with unique absorption and luminescence at 430 nm and 605 nm, respectively.

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Section: Resultsmentioning

confidence: 95%

“…The strong characteristic bonds observe at 3334.7 cm −1 were attributed to the O − H stretching mode. The band centred at 2931.7 cm −1 corresponding to the N − H stretching vibrations of amide I overlapped with the C − H stretching mode . The band at 1409.…”

Section: Resultsmentioning

confidence: 96%

Can earthworms biosynthesize highly luminescent quantum dots?

2018

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“…Therefore, microwave treatment depends highly on the solvents used during the process. In this study, ethylene glycol was used as a microwave absorber solvent and stabilizing agent to control the growth and agglomeration of particles . During microwave irradiation, ethylene glycol underwent dehydration to form acetaldehyde and interacted with the gadolinium precursor to form the gadolinium complex.…”

Section: Resultsmentioning

confidence: 99%

Physical and optical studies of Gd₂O₂S:Eu³⁺ nanophosphors by microwave irradiation and γ‐irradiation methods

et al. 2019

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Gd 2 O 2 S:Eu 3+ nanophosphors have been successfully synthesized using microwave irradiation and γ-irradiation methods with polyvinyl pyrrolidone as a stabilizer. The physical and luminescence spectra were compared. The morphologies of both Gd 2 O 2 S:Eu 3+ nanophosphors were in the hexagonal phase and mainly consisted of spherical nanostructures with diameters of~90 nm and~50 nm for both microwave irradiation and γ-irradiation methods. Upon 325 nm of ultraviolet (UV) light excitation, strong red emissions (626 nm) were observed for both methods; these emissions corresponded to the 5 D 0 → 7 F 2 transition of Eu 3+ ions. However, Gd 2 O 2 S:Eu 3+ nanophosphors following microwave treatment showed better luminescence intensity than Gd 2 O 2 S:Eu 3+ nanophosphors treated with γ-irradiation. This difference was attributed to the crystallinity phase and surface quenching effects of Gd 2 O 2 S: Eu 3+ nanophosphors. The reaction mechanisms of Gd 2 O 2 S:Eu 3+ nanophosphors in both methods are discussed in detail.

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“…(2) Negative contrast agents which are superparamagnetic materials such as magnetite (Fe 3 O 4 ) nanoparticles. These kind of materials reduce transverse or T 2 relaxation times, leading to dark T 2 ‐weighted images . The ratio r 2 /r 1 (T 1 /T 2 ) indicates the susceptibility of the material to be used as T 1 or T 2 contrast agent.…”

Section: Introductionmentioning

confidence: 99%

A study on the Concentration‐dependent Relaxometric Transition in Manganese Oxide Nanocolloid as MRI Contrast Agent

et al. 2019

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A green precipitation method has been used for the synthesis of ultra-small APTMS-mPEG conjugated Mn 3 O 4 nanoparticles. Spherical cores in the uniform size of 4 � 1 nm were characterized by HRTEM. Zeta potential of À 45 mV and the invariant turbidimetry results during the time, confirmed super-stability of the colloids. MRI relaxometry by 1.5 T scanner represented two values of r 1 = 8.23 s À 1 mM À 1 and r 1 = 7.3 s À 1 mM À 1 for diluted and concentrated samples. The r 2 /r 1 ratio was also decreased from 11.86 to 6.9 by dilution of colloids. Particle aggregation and motional narrowing phenomena led to a dual T 1 /T 2 contrast agent in the Mn ion concentrations of more than 0.2 mM. The optimum concentration of Mn ion for maximum dual signal intensity was estimated about 0.4 mM which is two times less than commercial Gd-DTPA. Cytotoxicity was examined through MTT assay and respectively, showed high cell viability at 48 h incubation. Overall, a potential dual T 1 /T 2 contrast agent was developed for early-stage detection.

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Rapid microwave-assisted synthesis of PVP-coated ultrasmall gadolinium oxide nanoparticles for magnetic resonance imaging

Cited by 32 publications

References 41 publications

Can earthworms biosynthesize highly luminescent quantum dots?

Can earthworms biosynthesize highly luminescent quantum dots?

Physical and optical studies of Gd₂O₂S:Eu³⁺ nanophosphors by microwave irradiation and γ‐irradiation methods

A study on the Concentration‐dependent Relaxometric Transition in Manganese Oxide Nanocolloid as MRI Contrast Agent

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Rapid microwave-assisted synthesis of PVP-coated ultrasmall gadolinium oxide nanoparticles for magnetic resonance imaging

Cited by 32 publications

References 41 publications

Can earthworms biosynthesize highly luminescent quantum dots?

Can earthworms biosynthesize highly luminescent quantum dots?

Physical and optical studies of Gd2O2S:Eu3+ nanophosphors by microwave irradiation and γ‐irradiation methods

A study on the Concentration‐dependent Relaxometric Transition in Manganese Oxide Nanocolloid as MRI Contrast Agent

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Physical and optical studies of Gd₂O₂S:Eu³⁺ nanophosphors by microwave irradiation and γ‐irradiation methods