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- W2074850748 abstract "The role of the initial degree of ionization (αi) of polyethylenimine (PEI) in the dispersion of SiC nanopartilces in water was investigated by sedimentation and rheological measurements. The ionization of PEI was characterized by potentiometric titration, which indicated a pH-dependent conformational transition. The dispersion of SiC particles in the presence of PEI was found to strongly depend on the αi. In the presence of 0.4% by weight PEI, the 23.8% SiC by volume (ΦSiC= 23.8) slurries showed a Newtonian behavior for αi= 0.12–0.4 values, whereas a shear-thinning behavior was observed for αi > 0.4 in the optimal pH range of around pH 4. The rheological behavior of the slurries exhibited a strong dependence on the concentration of PEI of αi= 0.12–0.4 and the slurry showed a Newtonian behavior at an optimal concentration of 0.4% by weight. The stabilization may be dominated by an electrosteric effect arising from the adsorbed PEI of αi= 0.12–0.4. The flocculation mechanism of the slurries with PEI of αi > 0.4 is also discussed." @default.
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- W2074850748 date "2003-01-01" @default.
- W2074850748 modified "2023-10-10" @default.
- W2074850748 title "Role of the Initial Degree of Ionization of Polyethylenimine in the Dispersion of Silicon Carbide Nanoparticles" @default.
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- W2074850748 doi "https://doi.org/10.1111/j.1151-2916.2003.tb03302.x" @default.
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