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Minji Gu,Shanigaram Mallesh,Ki Hyeon Kim 한국자기학회 2021 Journal of Magnetics Vol.26 No.3
The 1D chain-like α-Fe₂O₃ nanostructures were synthesized using a facile solvothermal method followed by subsequent annealing in air at 450 °C for two hours. We have investigated the microstructure and magnetic properties of the samples in detail. Field emission scanning electron microscopy revealed the formation of 1D chain-like morphology of α-Fe₂O₃ nanostructures. The presence of the pure hematite phase in all samples was confirmed by X-ray diffraction (XRD). Further, results obtained from Raman and FT-IR spectra are consistent with XRD outcomes. The magnetic studies (M-H curves) of samples exhibited a wide range of properties. The S₁ and S5 samples exhibit large coercivity (HC) values of 878 Oe and 1092 Oe, respectively. Interestingly, large magnetization 15 emu/g and lowest HC (= 56 Oe) were observed for sample S₂ compared to all other samples. The unusual magnetic properties of the samples are due to morphology (shape, size, and self-assembled 1D orientation of particles), surface spin disorder, and (surface/interface) anisotropy of the nanoparticles.
Kwak, Minsuk,Gu, Wonji,Jeong, Heekyung,Lee, Hyunjung,Lee, Jung-uk,An, Minji,Kim, Yong Ho,Lee, Jae-Hyun,Cheon, Jinwoo,Jun, Young-wook American Chemical Society 2019 NANO LETTERS Vol.19 No.6
<P>Multifunctional magnetic nanoparticles have shown great promise as next-generation imaging and perturbation probes for deciphering molecular and cellular processes. As a consequence of multicomponent integration into a single nanosystem, pre-existing nanoprobes are typically large and show limited access to biological targets present in a crowded microenvironment. Here, we apply organic-phase surface PEGylation, click chemistry, and charge-based valency discrimination principles to develop compact, modular, and monovalent magnetofluorescent nanoparticles (MFNs). We show that MFNs exhibit highly efficient labeling to target receptors present in cells with a dense and thick glycocalyx layer. We use these MFNs to interrogate the E-cadherin-mediated adherens junction formation and F-actin polymerization in a three-dimensional space, demonstrating the utility as modular and versatile mechanogenetic probes in the most demanding single-cell perturbation applications.</P> [FIG OMISSION]</BR>