Phase Equilibria and Evaporation Rates in a Four Component Emulsion

Abstract

The cosmetic system ofwater, lecithin,polyethylene glycol (M.W. 5000), and white oil was studied and the phase diagram determined using visual observation, low angle x-ray diffraction and chemical analysis.The results showed the lecithinI water lamellarliquid crystal to be retained when the polyethylene glycol was gradually replaced by white oil. The polyethylene glycol was solubilizedin the lamellarliquid'crystal to a maximum level of 10%, the white oil to 8%.The evaporation rate, from a thinlayer, was followed gravimetrically. The existing structures as the evaporation proceeded were identified optically. Evaporation ofwater from the three phase emulsion lead to crystallization ofthe polymer in the previously existing water droplets, leading to a four phase system of polyethyleneglycol, polyethylene glycol/water, LLC, and white oil.A dramatic decrease in the loss rate of water was observed when all four components co-exist in equilibrium.

Cosmetics’ Quality Control

“…Beyond the advantages already mentioned, in a research conducted by Moaddel and Friberg (1995), the authors showed that the presence of lamellar liquid crystals in an emulsion avoids the water evaporation rate in this system, thus contributing in another way to the stability and maintenance of the cosmetic quality.…”

Electroacoustic Study of Adsorption of PEO on Sunflower Oil-in-Water Emulsion Drops

“…3 It has been shown that PEO can be adsorbed on many kinds of particle surfaces such as mica, [4][5][6] glass, 7,8 latex, [9][10][11][12][13][14][15][16] silica, 6,13,[17][18][19][20][21] and the air-water interface. 22 It can interact with neutral lipid 23 and oil 24 surfaces. Numerous experimental techniques have characterized the adsorbed PEO conformations at the above interfaces.…”