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Received May 10, 2022
Accepted August 21, 2022
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Flow behavior of gadolinium doped ceria under different polymeric and hydrodynamic environment for tape casting application
Department of Materials Science and Engineering, Chonnam National University, Gwangju 61186, Korea 1HMC, Department of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 05006, Korea
Korean Journal of Chemical Engineering, November 2022, 39(11), 2991-3002(12), 10.1007/s11814-022-1271-4
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Abstract
The present investigation consists of a comprehensive analysis of the rheological properties of tape casting slurry and optimization of its composition through rheological results. Formulation of slurry consists of gadolinium doped ceria (GDC) powder, solvent (ethanol and toluene), dispersant (menhaden fish oil), plasticizer (benzyl butyl phthalate160 and polyethylene glycol 8000), and binder (polyvinyl butyral 98). The slurry exhibits pseudoplastic behavior, which is drastically affected by a minute change in powder content. These changes in the flow properties were traced in terms of shear dependence (m) and fractal dimension (df) of aggregates, along with the trend of growth in aggregate size (R) and its volume fraction (Φa) in the presence of different additives. These results suggest that the GDC particles tend to form large, rigid aggregates, which show appearance of yield stress even at Φ>0.06. Furthermore, the addition of polymeric chains in the form of additives causes the steric stabilization of aggregates and formation of their 3-D network structure, which suppresses the sedimentation velocity to zero and provides crack-free and homogeneous green tape.
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Fleer GJ, Lyklema J, J. Colloid Interface Sci., 46, 1 (1974)
Zhang JX, Jiang DL, Tan SH, Gui LH, Ruan ML, J. Mater. Res., 17, 2019 (2002)
Wang J, Gao L, Ceram. Int., 26, 187 (2000)
Luo LH, Tok AIY, Boey FYC, Rengong Jingti Xuebao/Journal Synth. Cryst., 37, 188 (2006)
Chartier T, Bruneau A, J. European Ceram. Soc., 12, 243 (1993)
Meier LP, Urech L, Gauckler LJ, J. European Ceram. Soc., 24, 3753 (2004)
Lee B, Koo S, Powder Technol., 266, 16 (2014)
Cho J, Koo S, J. Ind. Eng. Chem., 27, 218 (2015)
Hong J, Balamurugan C, Im HN, Jeon SY, Yoo YS, Song SJ, J. Electrochem. Soc., 165, F132 (2018)
Krieger IM, Dougherty TJ, Trans. Soc. Rheol., 3, 137 (1959)
Casson N, Rheology of disperse systems, New York, NY (1959).
Smith TL, Bruce CA, J. Colloid Interface Sci., 72, 13 (1979)
Potanin AA, J. Colloid Interface Sci., 157, 399 (1993)
Quemada D, Rheol. Acta, 16, 82 (1977)
Willenbacher N, Georgieva K, Prod. Des. Eng. Formul. Gels Pastes, 1 (2013)
Galindo-Rosales FJ, Rubio-Hernández FJ, Velázquez-Navarro JF, Rheol. Acta, 48, 699 (2009)
Raghavan SR, Khan SA, J. Colloid Interface Sci., 185, 57 (1997)
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Jeon J, Koo S, J. Magn. Magn. Mater., 324, 424 (2012)
Koo S, J. Ind. Eng. Chem., 14, 679 (2008)
