Hydrophilic-Lipophilic Balance of Emulsifers and Methods for Determination the Emulsion Systems Stability

Document Type : compile

Authors

1 Malek Ashtar Industerial University, Chemistry and Chemical Engineering Complex, Tehran, Iran, P.O.Box 15875.1774

2 Chemistry group, Faculty of chemistry, Chemical Engineering Complex, Malek Ashtar Industerial University.

3 Chemistry Group, Defense Industries Organization, Tehran, Iran.

Abstract

An emulsion mixture system (usually water, oil and emulsifer) consists of two
immiscible phases, the dispersed phase and the dispersion medium (dispersant-
continuous). Due to their specifc rheological and physical-chemical properties,
emulsions are commonly used in different industries such as cosmetics-pharmaceuticals,
food and destruction (road construction, building destruction, etc.). One of the important
requirements is appropriate stability of the emulsions over a certain period of time.
Emulsions are thermodynamically unstable and several factors affect their instability
including the variables of production process and storage conditions. Therefore,
emulsifers are suitable to exhibit long-term stability and their performance can be
determined by identifying the hydrophilic-lipophilic balance (HLB) characteristic in
these compounds. HLB value is a number which is given by the emulsifer to indicate
the hydrophilic and lipophilic tendencies of the material. The present work introduces
the concept of HLB and methods for determination this character in various ionic and
nonionic emulsifers. Considering the relation of the emulsifer HLB to its stability,
different methods for evaluation the emulsions stabilities are discussed.

Keywords

Main Subjects


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