Effect of composition on rheological behavior of iron oxides produced by hydrothermal method

被引：5
作者：
de Oliveira, Alan R. [1 ]
Abrishamkar, Afshin [2 ]
Veloso, Ewerton M. [1 ]
de Oliveira, Fernando C. [3 ]
Da Silva, Jeferson G. [1 ]
Pereira, Juliano R. [1 ]
Diniz, Renata [4 ]
Denadai, Angelo M. L. [1 ]
机构：
[1] Univ Fed Juiz de Fora, ICV, Campus Governador Valadares UFJF GV, BR-35010177 Governador Valadares, MG, Brazil
[2] Swiss Fed Inst Technol, Dept Chem & Appl Biosci, Vladimir Prelog Weg 1, CH-8093 Zurich, Switzerland
[3] Ctr Fed Educ Tecnol Minas Gerais CEFET MG, Dept Quim & Met, Campus Timoteo,Rua Dezenove Novembro,121, BR-35180008 Ctr Timoteo, MG, Brazil
[4] Univ Fed Minas Gerais, Dept Quim, Campus Pampulha,Ave Pres Antonio Carlos,6627, BR-31270901 Belo Horizonte, MG, Brazil
来源：
CERAMICS INTERNATIONAL | 2017年 / 43卷 / 10期
关键词：
Iron oxides; Colloidal suspension; Rheology; Hydrogen bonding; MICROSTRUCTURAL EVOLUTION; MAGNETIC-PROPERTIES; ALPHA-FEOOH; FERRITE; TEMPERATURE; SIZE; NANOPARTICLES; STABILITY; VISCOSITY; WATER;
D O I：
10.1016/j.ceramint.2017.03.005
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The aim of the present work was to investigate the rheological properties of different iron oxides (Fe3O4, NiFe2O4, ZnFe2O4 and Ni0.5Zn0.5Fe2O4) aqueous suspensions. The oxides were produced through mixing the respective metallic sulfates within a closed isothermal reactor at 100 degrees C and at pH approximate to 12, in an oxidant environment (provided by H2O2 0.63% w/v). The reactor was coupled with an adequate real-time data (RTD) acquisition system enabling measurement of temperature, pH and pressure. Obtained RTD data showed that once the isothermal conditions are reached, the pressure slowly decreases over time, which is a result of O-2 consumption through oxidation of Fe2+ to Fe3+. To characterize the suspensions as a function of temperature and shear rate, the steady rheology was used. The results revealed that the effect of temperature on viscosity of all suspensions was insignificant while steady rheology showed pseudoplastic behavior for all ferrites. The magnitude of viscosity and pseudoplasticity turned out to be in agreement with the hydrodynamic diameters of particles complying with the order: NiFe2O4 > Fe3O4 > Ni0.5Zn0.5Fe2O4 > ZnFe2O4. Finally, the rheological behavior of suspensions was attributed to the concentration of OH groups on the surface of particles and this hypothesis was effectively supported by DRX, FTIR and TGA/DTA measurements.
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收藏
页码：7436 / 7442
页数：7
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