- Preparation and Characterization of Stable Suspensions of Ni Nanoparticles
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Eun-Hee Lee, Min-Ku Lee, Chang-Kyu Rhee
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J Korean Powder Metall Inst. 2006;13(2):138-143.
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DOI: https://doi.org/10.4150/KPMI.2006.13.2.138
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- In this study, the effects of the dispersants, i.e., Hypermer KD-2 and poly(l-vinyl-2-pyrrolidone) (PVP), and their concentration on the dispersion stability of Ni nanoparticles (10nmsim40nm) in ethanol were investigated by using a visual inspection, a transmission profile (Turbiscan), and a zeta potential measurement. The transmission profiles measured by Turbiscan showed that the particle size increased over the entire height of the sample for suspensions with both the dispersants without showing any particle coalescence and sedimentation. The visual inspection also confirmed that the Ni suspensions with Hypermer KD-2 and PVP were very stable for more than a year. The zeta potential values varied from positive to negative with increasing the dispersant's concentration. The dispersion stability of the suspensions was not affected by both the dispersant's concentration and the zeta potential values. The observed suspension stability of Ni nanoparticles was attributed to the steric effect for the Hypermer KD-2 and to the bridging effect for the PVP.
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Citations
Citations to this article as recorded by  - Electrophoretic deposition of Ni nanoparticles from suspension on to a Ni plate
Keun-Yong Park, Young Rang Uhm, Kwang Jae Son, Deok-Yong Park
Research on Chemical Intermediates.2015; 41(9): 6721. CrossRef
- The Study of Charge Transfer Mechanism in Single Crystal Iron Perovskite
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Young-Rang Uhm, Chang-Kyu Rhee, Chul-Sung Kim
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J Korean Powder Metall Inst. 2006;13(2):112-118.
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DOI: https://doi.org/10.4150/KPMI.2006.13.2.112
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Abstract
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- [ R_1/3Sr_2/3FeO_3 ](R=Pr, Nd, and Sm) was synthesized and their magnetic properties and charge ordering(CO) transition related with lattice dynamics and oxygen vacancy were systematically investigated. The charge disproportion ation(CD) in R_1/3Sr_2/3FeO_3(R=Pr,Nd) was in which two kins of iron with valence state Fe3+ and Fe5+ were found with ratio of 2:1. In this charge ordering state a sequence of Fe3+Fe3+Fe5+Fe3+Fe3+Fe5+ exists aligned along the [111] direction of the pseudocubic perovskite structure. The charge ordering exist in distorted structure involving t_pd hybridization. The disordering phases coexist in distorted structure as temprature in creases that is controlled amount of oxygen vacancy. The magnetic hyperfine fields indicate charge tranfering temperature as it dissapeared drastically.
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