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Article Dans Une Revue Industrial and engineering chemistry research Année : 2011

Making Use of the Formulation-Composition Map To Prepare Highly Concentrated Emulsions with Particular Rheological Properties

Résumé

The effects of the formulation and dispersed-phase weight fraction on rheological properties of highly concentrated water-in-oil emulsions are reported. Because the surfactant concentratiOn is kept constant, emulsion characteristics may be represented on a formulation composition bidimensional map. The formulation variable is the hydrophilic lipophilic balance (BIB) number of the nonionic surfactant or surfactant mixture which ranges from 4.3 to 10. Highly concentrated water-in-dodecane emulsions are prepared using a semibatch process, with a dispersed-phase weight fraction ranging from 0.90 to 0.98. Two major effects are observed in relation to the formulation influence: First, elastic modulus (G') remarkably decreases in the vicinity of optimum formulation whenever the affinity of the surfactant for the oil and water phases is exactly balanced (HLB = 10.5). Second, the elastic modulus value passes through a maximum, concomitant to a minimum drop size, at some distance of the so-called optimum formulation (HLB = 7.7). Hence, the use of a bidimensional formulation composition map allows one to control and to modulate the final rheological properties of highly concentrated emulsions.
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Dates et versions

hal-00778488 , version 1 (20-01-2013)

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Emilio Paruta-Tuarez, Véronique Sadtler, Philippe Marchal, Lionel Choplin, Jean-Louis Salager. Making Use of the Formulation-Composition Map To Prepare Highly Concentrated Emulsions with Particular Rheological Properties. Industrial and engineering chemistry research, 2011, 50 (4), pp.2380-2387. ⟨10.1021/ie101467h⟩. ⟨hal-00778488⟩
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