Tsai, Chir-Jang and Chen, Chun-Nan and Tseng, Wenjea J. (2011) Effect of pyrogallol-poly(ethylene glycol) on stabilization, structure, and interparticle potential of concentrated nickel nanoparticle suspensions. Journal of Nanoparticle Research, 13 (12). pp. 6859-6868.
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Nickel nanoparticles with an average diameter of 90 nm have been dispersed in de-ionized water with addition of pyrogallol-poly(ethylene glycol) polymers, hereafter termed Gallol-PEG, of different molecular weights as a surfactant. Measurement of zeta potential, infrared spectrum, and adsorption isotherm confirms the preferential anchoring from polar end of the surfactant molecules on the particle surface, forming a Langmuir-typed adsorption layer (adlayer) to provide an electrosteric stabilization. Concentrated nanoparticle suspensions with a solids loading up to 40 vol.% and an apparent viscosity lower than 10 Pa s at a shear rate of 100 s −1 have been obtained, indicating that the Gallol-PEG adsorption is effective in facilitating the suspension flow under stress. The suspensions are yet fractal in structure with an experimentally determined fractal dimension of 2.1, revealing that a reaction-limited cluster–cluster aggregation is operative. This weakly coagulated fractal structure stems primarily from the shallow interparticle attraction operative over a moderate interparticle separation (~5–10 nm), and is prone to the adlayer thickness and the molecular conformation of the surfactant.
|Deposited By:||Prof. Alexey Ivanov|
|Deposited On:||05 Jan 2012 09:29|
|Last Modified:||05 Jan 2012 09:42|
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