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標題: Effect of polymeric surfactant on flow behaviors of nickel-ethanol-isopropanol suspensions
作者: Tseng, W.J.
Lin, S.Y.
關鍵字: nickel;rheology;surfactant;suspension;fractal;rheological behavior;electrodes;powder;aggregation;viscosity
Project: Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
期刊/報告no:: Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing, Volume 362, Issue 1-2, Page(s) 160-166.
Influence of a non-ionic, polymeric surfactant to the rheology and suspension structure of nickel (Ni) powders dispersed in ethanol-isopropanol solvents has been examined over a range of volumetric solids loadings (phi = 0.05-0.25), surfactant concentrations (0-5 wt.% of the solids), and shear rates (gamma = 10(1) to 10(3) s(-1)). The polymeric surfactant of propylene glycol facilitated the suspension flow, resulted in similar to60% reduction in viscosity (gamma = 10(2) s(-1)). A shear-thinning flow behavior was generally observed in the shear regime investigated, while dilatancy or even shear thickening was found at high shear rates (typically at gamma > 600 s(-1)). The shear-thinning flow revealed that the powdered suspensions were flocculated in structure. An estimate of the fractal dimension (D-f) of the suspension indicated that D-f = 2.2 and 2.1 for the Ni suspensions with and without the polymeric surfactant, respectively. The similar Df values suggested that the suspensions structures were most likely of a reaction-limited cluster aggregation (RLCA) model; to which, particle rearrangements were expected to occur as the suspensions were under shear stresses. (C) 2003 Elsevier B.V. All rights reserved.
ISSN: 0921-5093
DOI: 10.1016/s0921-5093(03)00618-x
Appears in Collections:材料科學與工程學系

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