Rheology and colloidal structure of silver nanoparticles dispersed in diethylene glycol |
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| Authors: | E Tamjid Bernd H Guenther |
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| Affiliation: | 1. Department of Mechanical Engineering, CFD Laboratory, McGill University, 688 Sherbrooke Street West, Montreal, QC H3A 2S6, Canada;2. Newmerical Technologies International, 680 Sherbrooke Street West, Montreal, QC H3A 2M7, Canada;1. Department of Mechanical Engineering, Islamic Azad University, Takestan Branch, Takestan, Iran;2. Department of Aerospace Engineering, K. N. Toosi University of Technology, Tehran, Iran;3. Department of Engineering, Payame Noor University, Tehran, Iran;4. Department of Engineering, Payame Noor University, Behbahan, Iran;5. Department of Mechanical Engineering, University of Guilan, Rasht, Iran;1. Department of Mechanical Engineering, University Malaya, 50603 Kuala Lumpur, Malaysia;2. UM Power Energy Dedicated Advanced Centre (UMPEDAC), Level 4, Wisma R & D, University of Malaya, 50603 Kuala Lumpur, Malaysia |
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| Abstract: | Rheological behavior of agglomerated silver nanoparticles (~ 40 nm) suspended in diethylene glycol over a wide range of volumetric solids concentrations (? = 0.11–4.38%) was studied. The nanoparticle suspensions generally exhibited a yield pseudoplastic behavior. Bingham plastic, Herschel–Bulkley and Casson models were used to evaluate the shear stress-shear rate dependency. Analyzing the effect of silver concentrations on the yield stress and viscosity of the suspensions followed an exponential form, revealing an increase in the degree of interparticle interactions with increasing solid concentrations. Fractal dimension (Df) was estimated from the suspension yield stress and ? dependence, and was determined as Df = 1.51–1.62 for the flocculated nanoparticle suspensions. This suggested that the suspension structure was probably dominated by the diffusion-limited cluster–cluster aggregation (DLCA) due mostly to the strong attractions involved in the interparticle potentials. Maximum solids concentration of the suspensions was determined to be ?m = 11%. |
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