Salt effects on the physical properties of magnetite nanoparticles synthesized at different NaCl concentrations

Park, Ja Young; Patel, Daksha; Choi, Eunsuk; Baek, Myung Ju; Chang, Yongmin; Kim, Tae Jeong; Lee, Gang Ho

doi:10.1016/j.colsurfa.2010.06.014

Cited by 20 publications

(9 citation statements)

References 29 publications

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“…This confirms that the synthesized particles exhibit superparamagnetic properties at room temperature. This is in good agreement with a previous study: that magnetite nanoparticles exhibit superparamagnetic properties when they are smaller than the critical size of the magnetic domain size [ 36 , 37 , 38 ].…”

Section: Resultssupporting

confidence: 93%

Room Temperature Co-Precipitation Synthesis of Magnetite Nanoparticles in a Large pH Window with Different Bases

2013

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Magnetite nanoparticles (Fe3O4) represent the most promising materials in medical applications. To favor high-drug or enzyme loading on the nanoparticles, they are incorporated into mesoporous materials to form a hybrid support with the consequent reduction of magnetization saturation. The direct synthesis of mesoporous structures appears to be of interest. To this end, magnetite nanoparticles have been synthesized using a one pot co-precipitation reaction at room temperature in the presence of different bases, such as NaOH, KOH or (C2H5)4NOH. Magnetite shows characteristics of superparamagnetism at room temperature and a saturation magnetization (Ms) value depending on both the crystal size and the degree of agglomeration of individual nanoparticles. Such agglomeration appears to be responsible for the formation of mesoporous structures, which are affected by the pH, the nature of alkali, the slow or fast addition of alkaline solution and the drying modality of synthesized powders.

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Section: Resultssupporting

confidence: 93%

Room Temperature Co-Precipitation Synthesis of Magnetite Nanoparticles in a Large pH Window with Different Bases

2013

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“…These properties are assigned to the immobilized magnetite nanoparticles on to zinc oxide nanotubes. The results agree with a previous study, that magnetite nanoparticles exhibit superparamagnetic properties when they are smaller than the critical size of the magnetic domain size [ 34 ].…”

Section: Resultssupporting

confidence: 93%

Novel Magnetic Zinc Oxide Nanotubes for Phenol Adsorption: Mechanism Modeling

et al. 2017

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Considering the great impact of a material’s surface area on adsorption processes, hollow nanotube magnetic zinc oxide with a favorable surface area of 78.39 m2/g was fabricated with the assistance of microwave technology in the presence of poly vinyl alcohol (PVA) as a stabilizing agent followed by sonic precipitation of magnetite nano-particles. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) micrographs identified the nanotubes’ morphology in the synthesized material with an average aspect ratio of 3. X-ray diffraction (XRD) analysis verified the combination of magnetite material with the hexagonal wurtzite structure of ZnO in the prepared material. The immobilization of magnetite nanoparticles on to ZnO was confirmed using vibrating sample magnetometry (VSM). The sorption affinity of the synthesized magnetic ZnO nanotube for phenolic compounds from aqueous solutions was examined as a function of various processing factors. The degree of acidity of the phenolic solution has great influence on the phenol sorption process on to magnetic ZnO. The calculated value of ΔH0 designated the endothermic nature of the phenol uptake process on to the magnetic ZnO nanotubes. Mathematical modeling indicated a combination of physical and chemical adsorption mechanisms of phenolic compounds on to the fabricated magnetic ZnO nanotubes. The kinetic process correlated better with the second-order rate model compared to the first-order rate model. This result indicates the predominance of the chemical adsorption process of phenol on to magnetic ZnO nanotubes.

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“…Accordingly, the addition of NaCl increases the repulsive forces between the colloidal magnetite particles, thereby increasing the dispersion stability. Therefore, it is also expected that the agglomeration of the particles will be suppressed, which is also supported by the previous experimental results where the size of synthesized magnetite nanoparticles was found to decrease with increasing NaCl concentration [ 22 ].…”

Section: Resultssupporting

confidence: 82%

Zeta Potentials of Magnetite Particles and Alloy 690 Surfaces in Alkaline Solutions

et al. 2020

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Magnetite particles deposited on the secondary side of a steam generator (SG) can degrade the integrity and performance of pressurized water reactors. Therefore, it is necessary to produce the data of fundamental interfacial electrokinetic properties of magnetite particles and SG tube materials. This study investigated the zeta potentials of magnetite nanoparticles and Alloy 690 surfaces, which were dependent on the pH value, pH agent, and the presence of NaCl. The zeta potentials of the magnetite nanoparticles increased in the negative direction as the pH increased, regardless of the pH agent. At the same pH value, the absolute values of the zeta potentials with different pH agents were: ethanolamine < ammonia < morpholine. In the presence of NaCl, the zeta potentials of the particles further increased negatively. The meaning of the measured zeta potentials was discussed in terms of the dispersion stability and the agglomeration of the particles. Based on the relationship between the zeta potentials of the particles and Alloy 690 surfaces, the magnetite deposition on Alloy 690 was also discussed. Furthermore, the empirical formulas for the pH-dependent zeta potentials of magnetite particles in each alkaline solution were suggested.

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Salt effects on the physical properties of magnetite nanoparticles synthesized at different NaCl concentrations

Cited by 20 publications

References 29 publications

Room Temperature Co-Precipitation Synthesis of Magnetite Nanoparticles in a Large pH Window with Different Bases

Room Temperature Co-Precipitation Synthesis of Magnetite Nanoparticles in a Large pH Window with Different Bases

Novel Magnetic Zinc Oxide Nanotubes for Phenol Adsorption: Mechanism Modeling

Zeta Potentials of Magnetite Particles and Alloy 690 Surfaces in Alkaline Solutions

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