Rheological Behavior of Aciculate Ultrafineα-FeOOH Particles under Alkaline Conditions

Li, Chunzhong; Cai, Shiyin; Fang, Tunan

doi:10.1006/jssc.1998.7922

Cited by 4 publications

(3 citation statements)

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“…It was also noted 17 that a strongly alkaline aqueous phase favors the formation of ferrite, whereas a low alkalinity favors the formation of α-FeOOH. Initial spherical Fe(OH) 2 particles were observed to be gradually replaced by acicular α-FeOOH particles 18 , so that the transition ratio was about 0.35 after 1 h, and 0.96 after 6.5 h. The transition ratio after 1 h, which is equal to the aging time of NiZn-ferrite particles in our experiments, is approximately in accordance with the TEM images of the samples synthesized at the medium pH values (Fig. 3a).…”

Section: Resultsmentioning

confidence: 99%

The characterization of nanosized nickel-zinc ferrites synthesized within reverse micelles of CTAB/1–hexanol/water microemulsion

Uskoković

Drofenik

Ban

2004

Journal of Magnetism and Magnetic Materials

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Stoichiometric nanocrystalline nickel-zinc ferrites were synthesized by a reverse micelle method following a multi-microemulsion approach. Different pH values were chosen for the alkali precipitating reaction during the synthesis of different powders. Synthesized, as-dried and subsequently calcined powders were characterized in terms of their magnetic properties. XRD analyses and specific-surface area measurements were used to determine the average particle sizes of the synthesized samples. DCS and TGA measurements were performed to reveal the phase transitions within the samples at elevated temperatures, whereas TEM was used to view and record the microstructure of the nanosized ferrite samples. A possible mechanism of the formation of the synthesized NiZn-ferrite was also discussed.

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Section: Resultsmentioning

confidence: 99%

The characterization of nanosized nickel-zinc ferrites synthesized within reverse micelles of CTAB/1–hexanol/water microemulsion

Uskoković

Drofenik

Ban

2004

Journal of Magnetism and Magnetic Materials

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“…On the other hand, if the reactors are scaled up, the concentration and temperature fields in the larger scale equipment should be controlled to be the same as in the smaller scale equipment. This has been proved in the process for preparing goethite nanoparticles by threephase oxidation of ferrous hydroxide slurry [46]. Our studies indicated that the reaction slurries displayed strong shear-thinning behavior, which can be fitted to the power law equation at the middle-later stages, and these slurries processed yield stress at quietus but without thixotropy.…”

Section: Scale-up and Manufacture Technologymentioning

confidence: 83%

“…The research work should include basic aspects of multiphase transport processes, such as interaction between phases, rheology, particle settling and fluidization, mixing and segregation, and then move to aerosol or colloidal reactors. The mixing properties, rheological behavior, and mass transfer properties for nanomaterials synthesis by chemical reaction in liquid phase were studied based on the three-phase system of nanosized acicular FeOOH and CaCO 3 [46][47][48]. Also, the engineering characteristics during the preparation of nanoparticles based on the fluidization chemical vapor deposition processes and the combustion processes of nanomaterials were studied [17,19,49,50].…”

Section: Scale-up and Manufacture Technologymentioning

confidence: 99%

Structure controlling and process scale-up in the fabrication of nanomaterials

2010

Front. Chem. Eng. China

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Nanotechnology is already having a significant commercial impact, and will very certainly have a much greater impact in the future. The research on process engineering and scale-up will be very important for the commercial production and application of nanomaterials, because the properties and structure of nanomaterials are not only determined by the nucleation and growth process, but also strongly affected by the engineering properties, such as the mixing, the heat and mass transfer, and also the distribution of temperature, concentration, etc. This paper will present some research work in our laboratory on the fabrication of nanomaterials. Based on the chemical engineering principle and methods, many kinds of novel nanomaterials can be synthesized and their structure can be easily controlled through adjusting the parameters of the fluid mixing, and the distribution of temperature, residence time and concentration, etc. By using the micro-mixing, heat and mass transfer and reaction control methods, the host-guest nanocomposites have been assembled and assumed as the novel electroanalytical sensing nanobiocomposite materials. Based on the principles of chemical engineering, the manufacturing technologies for magnetic powders, calcium carbonate, and titanium dioxide have been developed for commercial-scale production, and the largest production scale has reached 15 kt/year.

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Chapter 26. Mechanisms and kinetics in the solid state

Young¹

1999

Annu. Rep. Prog. Chem., Sect. A

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Rheological Behavior of Aciculate Ultrafineα-FeOOH Particles under Alkaline Conditions

Cited by 4 publications

References 14 publications

The characterization of nanosized nickel-zinc ferrites synthesized within reverse micelles of CTAB/1–hexanol/water microemulsion

The characterization of nanosized nickel-zinc ferrites synthesized within reverse micelles of CTAB/1–hexanol/water microemulsion

Structure controlling and process scale-up in the fabrication of nanomaterials

Chapter 26. Mechanisms and kinetics in the solid state

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