Winsor계에서 제조된 O/W 에멀젼의 안정성 연구-1

조완구

Journal of the Korean Industrial and Engineering Chemistry, Vol.9, No.2, 261-267, April, 1998

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Winsor계에서 제조된 O/W 에멀젼의 안정성 연구-1

Stability of O/W Emulsions Prepared from Winsor Systems-1

조완구

초록

본 논문에서는 Winsor systems으로부터 제조된 AOT 에멀젼의 안정성을 염화나트륨의 농도 변화에 따라 관찰하였다. 에멀젼은 헵탄+염화나트륨 수용액+AOT고 구성하였다. 염화나트륨 농도의 증가에 따라 안정성은 증가를 보이다가 일정 농도 이후에는 안정성이 급격히 감소하였다. 저 농도 염화나트륨에서는 크리밍 현상이 주로 유상과 수상의 비중 차이에 의한 당일 입자의 상승에 기인하였다. 시간 경과에 따른 크리밍 현상의 모델을 개발하여 적용한 결과 저 농도의 염화나트륨에서는 실험 결과와 잘 일치하였으나 고 농도의 염화나트륨에서는 에멀젼 입자가 작아지면서 (입자의 부력이 감소) 입자 사이의 반발력이 감소하고 오히려 인력이 증가하면서 안정성이 감소하였다.

We have investigated the stability of macroemulsions of AOT prepared from Winsor systems. The emulsion system was prepared from heptane+aqueous NaCl+AOT. As the concentration of NaCl increases, the stability of the emulsion increases, reaches a maximum, and then decreases. At low salt concentration the creaming occurred due to density difference of oil and aqueous phases. We developed a model for the creaming. Behavior of the emulsions containing low salt could be described very well by the model, however, at high salt concentration the electrostatic repulsion decreased due to screening and droplets started to attract each other and the stability of the emulsion decreased.

[References]

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[1] Encyclopedia of Emulsion Technology, P. Becher, Ed., Vol. 4, Marcel Dekker, New York (1996)

[2] Aveyard R, Binks BP, Cho WG, Fisher LR, Fletcher PD, Klinkhammer F, Langmuir, 12(26), 6561 (1996)

[3] Cho WG, Fletcher PDI, J. Chem. Soc.-Faraday Trans., 93, 1389 (1997)

[4] Aveyard R, Binks BP, Clark S, Mead J, J. Chem. Soc.-Faraday Trans., 82, 125 (1986)

[5] Aveyard R, Binks BP, Mead J, J. Chem. Soc.-Faraday Trans., 82, 1775 (1986)

[6] Aveyard R, Binks BP, Lawless TA, Mead J, J. Chem. Soc.-Faraday Trans., 81, 2155 (1985)

[7] Binks BP, Chem. Ind., 14, 537 (1993)

[8] Kellay H, Hendrikx Y, Meunier J, Binks BP, Lee LT, J. Phys. II France, 3, 1747 (1993)

[9] Shinoda K, Friberg FS, Emulsion and Solubilization, Wiley, New York (1986)

[10] Friberg S, Solans C, Langmuir, 2, 121 (1986)

[11] Binks BP, Kelly H, Meunier J, Europhys. Lett., 16, 53 (1991)

[12] Shinoda K, Saito H, J. Colloid Interface Sci., 30, 258 (1969)

[13] Happei J, Brenner H, Low Reynolds Number Hydrohynamics, Chapter 3, Prentice Hall, New York (1965)

[14] Petsev DN, Starov VM, Ivanov IV, Colloids Surf., 81, 65 (1993)

[15] Bibette J, Mason TG, Gang H, Weitz DA, Phys. Rev. Lett., 69, 681 (1992)

[16] Bibette J, Mason TG, Gang H, Weitz DA, Langmuir, 9, 3352 (1993)