Transcription of Surfactants – classification, features and applications
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Surfactants – classification, features and applications
Surfactants classification, features and applicationsSurfactants classification, features and applicationsN. D. Denkovand S. TcholakovaDepartment of Chemical Engineering,Faculty of Chemistry, Sofia University, Sofia, BulgariaLecture at COST P21 Training School Physics of droplets: Basic and advanced topics Borovets, Bulgaria, 12 13 July, 20101. Classification of Particles as foam and emulsion Role of Surfactants for various foam and emulsion properties:(a) Thin film drainage and stability(b) Foam rheology(c) Foam drainage(d) Ostwald ripening4. Current Low molecular mass Surfactants 9 Nonionic 9 Ionic9 Amphoteric Polymeric surfactants9 Synthetic9 Natural Particles as surfactant species9 Spherical vs. non-spherical9 Hydrophilic vs.
Relation between HLB and surfactant applications HLB < 8 HLB > 10 • Mixing unlike oils together – surfactants with HLB’s of 1 to 3 • Preparing water-in-oil emulsions – surfactants with HLB’s of 4 to 6 • Preparing self emulsifying oils
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