Relaxivities of hydrogen protons in aqueous solutions of PEG-coated rod-shaped manganese-nickel-ferrite (Mn0.4Ni0.6Fe2O4) nanoparticles

Abstract

Spinel-structured manganese (Mn)-nickel (Ni)-ferrite nanoparticles were synthesized using a chemical co-precipitation method. Coating with PEG (polyethylene glycol) was simultaneously conducted along with the synthesis of Mn-Ni-ferrites. The X-ray diffraction (XRD) and the Fourier-transform infrared (FTIR) analyses revealed a cubic spinel ferrite structure of the synthesized nanoparticles. Transmission electron microscopy (TEM) images showed that the synthesized nanoparticles were rod-shaped with a uniform size distribution and that the average length and width were 15.13 ± 1.32 nm and 3.78 ± 0.71 nm, respectively. The bonding status of PEG on the nanoparticle surface was checked by using FTIR. The relaxivities of the hydrogen protons in the aqueous solutions of the coated particles were determined by using nuclear magnetic resonance (NMR) spectrometry. The T1 and the T2 relaxivities were 0.34 ± 0.11 mM −1 s −1 and 29.91 ± 0.98 mM −1 s −1 , respectively. This indicates that the synthesized PEG-coated Mn-Ni-ferrite nanoparticles are suitable for use as T2 contrast agents.

Biotransformation and toxicity evaluation of functionalized manganese doped iron oxide nanoparticles

“…A characteristic band appears around 1,112 cm −1 ascribe to C‐O‐C stretching of ether, which attributing the group (‐CH 2 ‐O‐CH 2 ) belongs to PEG. These results confirm the presence of PEG at the surface of manganese doped IONPs 25‐27 . Wide Peak appears at wavenumber range from 3,000–3,200 cm −1 is due to Hydrogen‐bonded O‐H stretching vibrations.…”

Influence of the modifiers in polyol method on magnetically induced hyperthermia and biocompatibility of ultrafine magnetite nanoparticles

“…Typical for ultrafine magnetite nanoparticles, Fe–O bonds were observed in the range of 400–650 cm −1 12 . The C–O–C ether stretching vibration related to the presence of -CH 2 –OH–CH 2 - in glycols was observed at around 1100 cm -1 45 . Also, the characteristics of ethylene glycol-coated magnetite nanoparticle vibrations related to the C-H bending and C–O stretching were observed at around 1429 and 1054 cm -1 , respectively 35 , 46 Broad vibration at around 1633 cm -1 corresponds to the H–O–H deformation peak 47 , 48 .…”

Novel Microwave Absorber of NixMn1–xFe2O4/Carbonized Chaff (x = 0.3, 0.5, and 0.7) Based on Biomass

“…The XRD patterns of Ni x Mn 1−x Fe 2 O 4 /carbonized chaff (x = 0.3, 0.5, and 0.7) composites are shown in Figure 1. The diffraction peaks at 2θ = 30.5°, 35.8°, 43.6°, 57.2°, and 62.9°are corresponded to the (220), (311), (400), (511), and (440) planes of the spinel structure Ni x Mn 1−x Fe 2 O 4 ; 25,26 the diffraction peak around 2θ = 44.9°is assigned to the (111) plane of nickel 27 because a small amount of Ni 2+ was reduced to pure nickel in ethylene glycol solution at high temperature. 28 Moreover, the diffraction peak of carbonized chaff cannot be observed in the XRD pattern, which may be attributed to the less content and existence form of amorphous state.…”