Droplet deformability and emulsion rheology: steady and dynamic behavior

Yasushi Saiki; Clive A. Prestidge

Korea-Australia Rheology Journal, Vol.17, No.4, 191-198, December, 2005

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Droplet deformability and emulsion rheology: steady and dynamic behavior

Yasushi Saiki, and Clive A. Prestidge^†

Ian Wark Research Institute, The ARC Special Research Centre for Particle and Material Interfaces, University of South Australia, Mawson Lakes, SA 5095, Australia

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The static and dynamic rheological behavior of concentrated sodium dodecylsulfate (SDS) stabilized, deformability controllable polydimethylsiloxane (PDMS) emulsions is reported and comparisons made with silica (hard sphere) suspensions. Steady-mode measurements indicate “hard” (viscoelastic) droplets behave as hard spheres, while “soft” (viscous) droplets induce structural flexibility of the emulsion against shear. Dynamic-mode measurements reveal that viscoelasticity of droplets provides the great magnitude of elasticity for the “hard” emulsion, while formation of planar films between droplets is the origin of the elasticity of “soft” emulsions. Combination of steady and dynamic rheological behavior has enabled depiction of droplet structure evolution in relation to the shear stress applied, especially by taking advantage of the normal force that reflects the transient deformation of droplets.

Keywords:emulsion rheology;droplet deformability;polydimethylsiloxane

[References]

Barnes HA, Colloids Surf. A: Physicochem. Eng. Asp., 91, 89 (1994)
BARNES HA, J. Non-Newton. Fluid Mech., 56(3), 221 (1995)
Dimitrova TD, Leal-Calderon F, Adv. Colloid Interface Sci., 108-09, 49 (2004)
Freitas SP, Da Silva FC, Lago RCA, Qassim RY, Int. J. Food Sci. Technol., 31, 319 (1996)
Gillies G, Prestidge CA, Adv. Colloid Interface Sci., 108-109, 197 (2004)
Gillies G, Prestidge CA, Attard P, Langmuir, 18(5), 1674 (2002)
Goller MI, Obey TM, Teare DOH, Vincent B, Wegener MR, Colloids Surf. A: Physicochem. Eng. Asp., 123-124, 183 (1997)
Gotze W, Sjogren L, Rep. Prog. Phys., 55, 241 (1992)
Harkins WD, Brown FE, J. Am. Chem. Soc., 41, 499 (1919)
Kiss G, Porter RS, Mechanical and thermophysical properties of polymer liquid crystals, Chapman & Hall, London. (1998)
Lacasse MD, Grest GS, Levine D, Mason TG, Weitz DA, Phys. Rev. Lett., 76, 3448 (1996)
Mason TG, Weitz DA, Phys. Rev. Lett., 75, 2770 (1995)
Mason TG, Lacasse MD, Grest GS, Levine D, Bibette J, Weitz DA, Phys. Rev. E, 56, 3150 (1997)
Montesi A, Pena AA, Pasquali M, Phys. Rev. Lett., 92, 058303 (2004)
Nawab MA, Mason SG, Trans. Faraday Soc., 54, 1712 (1958)
OBEY TM, VINCENT B, J. Colloid Interface Sci., 163(2), 454 (1994)
Raghavan SR, Khan SA, J. Colloid Interface Sci., 185(1), 57 (1997)
Saiki Y, Prestidge CA, Colloids Surf. A: Physicochem. Eng. Asp., submitted. (2005)
Tadros TF, Langmuir, 6, 28 (1990)
Tadros TF, Colloids Surf. A: Physicochem. Eng. Asp., 91, 39 (1994)
Taylor GI, Proc. R. Soc. London, Ser. A, 138, 41 (1932)

[Referenced By]

[1] Barnes HA, Colloids Surf. A: Physicochem. Eng. Asp., 91, 89 (1994)

[2] BARNES HA, J. Non-Newton. Fluid Mech., 56(3), 221 (1995)

[3] Dimitrova TD, Leal-Calderon F, Adv. Colloid Interface Sci., 108-09, 49 (2004)

[4] Freitas SP, Da Silva FC, Lago RCA, Qassim RY, Int. J. Food Sci. Technol., 31, 319 (1996)

[5] Gillies G, Prestidge CA, Adv. Colloid Interface Sci., 108-109, 197 (2004)

[6] Gillies G, Prestidge CA, Attard P, Langmuir, 18(5), 1674 (2002)

[7] Goller MI, Obey TM, Teare DOH, Vincent B, Wegener MR, Colloids Surf. A: Physicochem. Eng. Asp., 123-124, 183 (1997)

[8] Gotze W, Sjogren L, Rep. Prog. Phys., 55, 241 (1992)

[9] Harkins WD, Brown FE, J. Am. Chem. Soc., 41, 499 (1919)

[10] Kiss G, Porter RS, Mechanical and thermophysical properties of polymer liquid crystals, Chapman & Hall, London. (1998)

[11] Lacasse MD, Grest GS, Levine D, Mason TG, Weitz DA, Phys. Rev. Lett., 76, 3448 (1996)

[12] Mason TG, Weitz DA, Phys. Rev. Lett., 75, 2770 (1995)

[13] Mason TG, Lacasse MD, Grest GS, Levine D, Bibette J, Weitz DA, Phys. Rev. E, 56, 3150 (1997)

[14] Montesi A, Pena AA, Pasquali M, Phys. Rev. Lett., 92, 058303 (2004)

[15] Nawab MA, Mason SG, Trans. Faraday Soc., 54, 1712 (1958)

[16] OBEY TM, VINCENT B, J. Colloid Interface Sci., 163(2), 454 (1994)

[17] Raghavan SR, Khan SA, J. Colloid Interface Sci., 185(1), 57 (1997)

[18] Saiki Y, Prestidge CA, Colloids Surf. A: Physicochem. Eng. Asp., submitted. (2005)

[19] Tadros TF, Langmuir, 6, 28 (1990)

[20] Tadros TF, Colloids Surf. A: Physicochem. Eng. Asp., 91, 39 (1994)

[21] Taylor GI, Proc. R. Soc. London, Ser. A, 138, 41 (1932)