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Rheology and colloidal structure of silver nanoparticles dispersed in diethylene glycol

Tamjid, E ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.powtec.2009.08.022
  3. Abstract:
  4. Rheological behavior of agglomerated silver nanoparticles (~ 40 nm) suspended in diethylene glycol over a wide range of volumetric solids concentrations (φ{symbol} = 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 φ{symbol} 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 φ{symbol}m = 11%
  5. Keywords:
  6. Colloid ; Fractal structure ; Nanofluid ; Bingham plastic ; Casson model ; Colloidal structures ; Diethylene glycol ; Diffusion-limited cluster ; Exponential form ; Herschel-Bulkley ; Inter-particle interaction ; Interparticle potential ; Nanoparticle suspension ; Pseudoplastic ; Rheological behaviors ; Shear rates ; Silver concentration ; Silver nanoparticles ; Solid concentrations ; Solids concentrations ; Suspension structure ; Association reactions ; Colloid chemistry ; Concentration (process) ; Elasticity ; Flocculation ; Fractal dimension ; Glycols ; Nanofluidics ; Nanoparticles ; Plasticity ; Rheology ; Shear deformation ; Silver ; Viscosity ; Yield stress ; Suspensions (fluids) ; Metal nanoparticle ; Silver nanoparticle ; Unclassified drug ; Article ; Chemical interaction ; Chemical structure ; Flow kinetics ; Fractal analysis ; Shear stress
  7. Source: Powder Technology ; Volume 197, Issue 1-2 , 2010 , Pages 49-53 ; 00325910 (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S0032591009004823