With Hansen's solubility parameters, δ o 2 = δ d 2 + δ p 2 + δ h 2, the correlation between the degree of exfoliation of organically modified clays and the solvent in which the clay platelets are dispersed/mixed has been analyzed. It has been found that the dispersion force of the solvent, reflected by δ d, is the principal factor determining whether the clay platelets remain suspended in the solvent while the polar (δ p ) and hydrogen-bonding (δ h ) forces affect primarily the tactoid formation/structure of the suspended platelets. The organically modified clays studied in this work precipitated in any solvent with molecules with moderately strong hydrogen-bonding groups. The correlation found has been used to correctly identify a solvent, trichloroethylene, which completely exfoliates the organically modified clay studied in this work.
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Charles J. Glinka (2003) studied this question.
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