α-monostearin and sodium stearate as emulsifying agents

✍ Scribed by Jellinek, H. H. G. ;Anson, H. A.

• Book ID: 102888572
• Publisher: Wiley (John Wiley & Sons)
• Year: 1949
• Weight: 720 KB
• Volume: 68
• Category: Article
• ISSN: 0368-4075
• DOI: 10.1002/jctb.5000680403

✦ Synopsis

Abstract

I. Interfacial tensions of the following systems have been measured at 70°C. by a capillary height method:

(a) Water‐white oil containing α‐monostearin against water; (b) Water‐white oil against water containing sodium stearate; (c) Water‐white oil containing α‐monostearin against water containing sodium stearate.

The areas (in Angstrom units) occupied by each molecule at the interface have been evaluated from the interfacial data obtained.

2. Separation of phases at 70° of emulsions of Water‐white oil and water containing cither α‐monostearin in the oil or sodium stearate in wafer or both emulsifying agents, has been studied under controlled conditions. The phase volume ratio has been kept constant at I : I in all experiments.

3. It was ascertained that α‐monostearin gives W/O emulsions, but that the addition of sodium stearate to the water phase leads to the formation of O/W emulsions. The amount of sodium stearate needed to bring about the inversion is only slightly dependent on the concentrations of e‐monostearin in the range of concentrations investigated. A combination of both emulsifying agents gives more stable emulsions than equivalent amounts of each emulsifying agent alone. The mechanism of inversion is discussed. The appearance of the emulsions has been characterised microscopically.