Dispersion and rheology of nickel nanoparticle inks

Nickel nanoparticles were dispersed in α-terpineol solvents, and their rheological behaviour and suspension structure were examined using various organic surfactants, surfactant concentrations (0–10 wt.% of the powder) and solids loadings (φ=0.01–0.28 in volumetric ratios) over a shear-rate range 10...

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Bibliographic Details
Published in:Journal of materials science 2006-02, Vol.41 (4), p.1213-1219
Main Authors: Tseng, Wenjea J, Chen, Chun-Nan
Format: Article
Language:English
Subjects:
alpha-terpineol
Applied sciences
Dispersion
Dispersions
drying
Exact sciences and technology
fractal dimensions
Fractal geometry
Inks
Materials science
Metals. Metallurgy
Nanocomposites
Nanomaterials
Nanoparticles
Nanostructure
Nickel
Polyester resins
Polyesters
Pseudoplasticity
Rheological properties
Rheology
Shear rate
Sintering (powder metallurgy)
solvents
Substrates
Surfactants
Terpineol
van der Waals forces
Viscosity
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Summary:Nickel nanoparticles were dispersed in α-terpineol solvents, and their rheological behaviour and suspension structure were examined using various organic surfactants, surfactant concentrations (0–10 wt.% of the powder) and solids loadings (φ=0.01–0.28 in volumetric ratios) over a shear-rate range 10⁰–10³ s⁻¹. A surfactant of oligomer polyester was found effective in the nanoparticle dispersion. An optimal surfactant concentration ca. 2–4 wt.% of the solids was found; beyond which, the apparent viscosity increased adversely. The oligomer-polyester molecules appeared to adsorb preferentially on the nanoparticle surface, forming a steric layer which facilitates the ink flow for the improved dispersion. A pseudoplastic flow behaviour was found as shear rate increased, and a maximum solids concentration (φₘ) was estimated as φₘ=0.32. The interparticle potential was dominated by van der Waals attraction in the terpineol liquid, and a reaction-limited cluster aggregation (RLCA) featuring with a fractal dimension (D f) of 2.0 was calculated. This finding together with the reduced φₘ reveals that the nanoparticle inks were flocculated in character even with the presence of polyester surfactant. Additionally, a porous (electrically conductive) particulate network was expected to form if the inks were printed on a non-conductive substrate followed then by drying and sintering in practice.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-005-3659-z