Unified scaling behavior of physical properties of clays in alcohol solutions
2011
Pujala, Ravi Kumar | Pawar, Nisha | Bohidar, H.B.
This paper reports observation of universal scaling of physical properties of clay particles, Laponite (aspect ratio=30) (L) and Na Montmorillonite (MMT, aspect ratio=200), in aqueous alcohol solutions (methanol, ethanol and 1-propanol) with solvent polarity, defined through reaction field factor fOH(ɛ₀,n)=[(ɛ₀−1/ɛ₀+2)−(n²−1/n²+2)], at room temperature (20°C). Here, ɛ₀ and n are the static dielectric constant and refractive index of the solvent concerned. Physical properties (Z) such as zeta potential, effective aggregate size, viscosity and surface tension scaled with the relative solvent polarity as Z∼δfᵅ; δf=(fw(ɛ₀,n)−fOH(ɛ₀,n)), where fw(ɛ₀,n) is the reaction field factor for water, Z is the normalized physical property, and α is its characteristic scaling exponent. The value of this exponent was found to be invariant of aspect ratio of the clay but dependent on the solvent polarity only.
Show more [+] Less [-]AGROVOC Keywords
Bibliographic information
This bibliographic record has been provided by National Agricultural Library