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- 저자 : Zvonko Jaglicic (검색결과 2 건)
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Hassan Hajifatheali,Ebrahim Ahmadi,Andrzej Wojtczak,Zvonko Jaglicic 한국고분자학회 2015 Macromolecular Research Vol.23 No.11
This study is a report on atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) using a ligand, N-methylbis[2-(dodecylthio)ethyl]amine (SNS), which is tridentate ligand with mixed donor atoms. This ligand was synthesized in a simple way and at a low cost and was used to prepare a Cu catalyst complex (Cu/ SNS) during the process of polymerization. The effects of various factors such as different molar ratios (100, 300, and 700 [monomer]:[initiator]) and cuprous halides (Br and Cl) on the polymerization of this ligand were investigated. The resulting catalyst complex mediated a living polymerization of MMA, yielding polymers with controlled molecular weights and narrow molecular weight distributions (1.09 < PDI < 1.4). The Highest PDI values were observed in the polymerization of the 700 molar ratio. The ligand, catalyst crystals formed at the end of polymerization, and synthesized polymers were characterized via UV-VIS, FTIR, CV, NMR, and GPC spectroscopy and single crystal X-ray crystallography as appropriate. The X-ray results for catalyst crystals showed that the catalyst was the deactivator (CuII Br2/SNS) of the ATRP equation and existed as a mononuclear catalyst complex.
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Ultrasmall iron oxide nanoparticles: Magnetic and NMR relaxometric properties
Branka Babic-Stojic,Vukoman Jokanovic,Dusan Milivojevic,Miroslav Pozek,Zvonko Jaglicic,Darko Makovec,Natasa Jovic Orsini,Mirjana Markovic,Katarina Arsikin,Verica Paunovic 한국물리학회 2018 Current Applied Physics Vol.18 No.2
Ultrasmall iron oxide (USPIO) nanoparticles, with diameter mostly less than 3 nm dispersed in an organic carrier fluid were synthesized by polyol route. The evolution of ZFC-FC magnetization curves with temperature, as well as the shift of the ac susceptibility peaks upon changing the frequency, reveal that the nanoparticles in the fluid are non-interacting and superparamagnetic with the blocking temperature TB ~10 K. The M€ossbauer spectra analysis proposed the core/shell structure of the nanoparticles consisting of stoichiometric g-Fe2O3 core and non-stoichiometric shell. The nanoparticle surface layer has a great influence on their properties which is principally manifested in significant reduction of the magnetization and in a large increase in magnetic anisotropy. Magnetic moments do not saturate in fields up to 5 T, even at the lowest measured temperature, T ¼ 5 K. The average magnetic particle diameter is changed from 1.3 to 1.8 nm with increasing magnetic field from 0 to 5 T which is noticeably smaller than the particle sizes measured by TEM. The estimated effective magnetic anisotropy constant value, Keff ¼ 2 105 J/m3, is two orders of magnitude higher than in the bulk maghemite. Measurements of the longitudinal and transverse NMR relaxivity parameters on water diluted nanoparticle dispersions at 1.5 T gave the values r1 ¼ 0.028 mmol1 s1, r2 ¼ 0.050 mmol1 s1 and their ratio r2/r1 ¼ 1.8. Continuous increase of the T1-weighted MRI signal intensity with increasing Fe concentration in the nanoparticle dispersions was observed which makes this ferrofluid to behave as a positive T1 contrast agent.
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