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Gadolinia nanofibers as a multimodal bioimaging and potential radiation therapy agent
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Continuous bead-free C-type cubic gadolinium oxide (Gd2O3) nanofibers 20-30 μm long and 40-100 nm in diameter were sintered by sol-gel calcination assisted electrospinning technique. Dipole-dipole interaction of neighboring Gd3+ ions in nanofibers with large length-to-diameter aspect ratio results in some kind of superparamagnetic behavior: fibers are magnetized twice stronger than Gd2O3
powder. Being compared with commercial Gd-DTPA/Magnevist®, Gd2O3 diethyleneglycol-coated (Gd2O3-DEG) fibers show high 1/T
1 and 1/T
proton relaxivities. Intense room temperature photoluminescence, high NMR relaxivity and high neutron scattering cross-section of 157Gd nucleus promise to integrate Gd2O3 fibers for multimodal bioimaging and neutron capture therapy.
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