Binks Bernard P, Rocher Anaïs
Surfactant & Colloid Group, Department of Chemistry, University of Hull, Hull HU6 7RX, UK.
J Colloid Interface Sci. 2009 Jul 1;335(1):94-104. doi: 10.1016/j.jcis.2009.03.089. Epub 2009 Apr 10.
The possibility of stabilising oil-water mixtures using wax particles alone is reported. As judged from contact angle measurements, wax particles are hydrophobic and act as effective emulsifiers of water-in-squalane emulsions. Specific differences exist depending on the chemical composition of the particles. The effect of temperature on emulsion stability has been explored in detail. If particles are pre-adsorbed to water drop interfaces by emulsification at room temperature, subsequent increase of temperature leads to a progressive increase in sedimentation and coalescence as particles melt and desorb from interfaces. The temperature range over which this occurs is similar to that of the melting range of the particles alone. If however the particles are melted prior to emulsification, surface-active long chain ester or acid molecules adsorb to freshly created interfaces giving rise to excellent stability to coalescence at high temperatures. Rapid cooling of these latter emulsions enhances their long-term stability as solidification of the molten wax leads to a thickening of the continuous oil phase.
据报道，仅使用蜡颗粒就能稳定油水混合物。从接触角测量结果判断，蜡颗粒具有疏水性，可作为角鲨烷包水乳液的有效乳化剂。根据颗粒的化学成分存在特定差异。已详细探讨了温度对乳液稳定性的影响。如果在室温下通过乳化将颗粒预吸附到水滴界面，随后温度升高会导致沉降和聚结逐渐增加，因为颗粒熔化并从界面解吸。发生这种情况的温度范围与单独颗粒的熔化范围相似。然而，如果颗粒在乳化之前熔化，表面活性长链酯或酸分子会吸附到新形成的界面上，从而在高温下对聚结具有出色的稳定性。这些后一种乳液的快速冷却提高了它们的长期稳定性，因为熔融蜡的固化导致连续油相变稠。
