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Colloids Interfaces 2018, 2(1), 2;

Composite Foaming Agents on the Basis of High-Molecular Natural Surfactants

Department of Analytical, Colloid Chemistry and Technology of Rare Elements, al-Farabi Kazakh National University, Almaty 050040, Kazakhstan
Authors to whom correspondence should be addressed.
Received: 2 December 2017 / Revised: 26 December 2017 / Accepted: 4 January 2018 / Published: 7 January 2018
(This article belongs to the Special Issue Selected Papers from Bubble & Drop 2017)
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Today, naturally occurring foam constituents and surface-active proteins with intriguing structures and functions are being identified from a variety of biological and chemical sources. In this paper we studied the colloid chemical properties of high-molecular natural surfactants such as keratin hydrolyzate (1.5–15%), gelatin (0.1–1%), and egg albumin (0.1–1%) in a wide concentration range. The foaming ability and foam-stabilizing properties of mixtures of these proteins were established. The high stability of foams obtained from mixtures of surfactants can be explained by the formation of mixed structured layers from the surface-active associates, promoting the thickening of foam films. The ratio of polymer mixtures was optimized (keratin (15%)-albumin (1%) (1:1)) to produce high-quality foaming agents. The foam parameters such as surface tension, capillary pressure of the Plateau-Gibbs channels, radii of curvature, critical micelle concentration, and relative viscosity were defined. The high surface activity and foam stability corresponds to a pH close to the isoelectric state of the proteins. This occurs due to the conformational changes of macromolecules of the protein at the liquid-gas interface, forming particles of colloidal size. View Full-Text
Keywords: foam; foam stability; high-molecular natural surfactants; foaming agents; surface tension; capillary pressure foam; foam stability; high-molecular natural surfactants; foaming agents; surface tension; capillary pressure

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Amankeldi, F.; Ospanova, Z.; Musabekov, K. Composite Foaming Agents on the Basis of High-Molecular Natural Surfactants. Colloids Interfaces 2018, 2, 2.

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