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Master in Chemical Technology  Surface and Interface Chemistry

Master in Chemical Technology  Surface and Interface Chemistry. Valentim M. B. Nunes Engineering Unit of IPT 2014. Synopsys.

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Master in Chemical Technology  Surface and Interface Chemistry

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  1. Master in Chemical Technology  Surface and Interface Chemistry Valentim M. B. Nunes Engineering Unit of IPT 2014

  2. Synopsys Colloidal systems: Fundamentals and industrial importance. Liquid/gas Interface: surface tension; Young-Laplace equation; capillarity; vapor pressure and radii of curvature; Kelvin equation; surface excess quantities; Gibbs equation.  Liquid-liquid Interface: scattering (work of cohesion and adhesion); interfacial tension; colloids aggregation; surfactants; emulsion stability (stabilizer agents and emulsifiers); Bancroft rule; phase inversion temperature (PIT). Solid/liquid Interface: wettability and contact angle; Young's equation; applications in detergency, oil extraction, paints and coatings.  Solid/gas Interface: adsorption isotherms and their classification; specific area of solids; Langmuir and BET models ; adsorption on solids; heats of adsorption; main applications of adsorbents and catalysts with higher technological impact, namely activated coals and zeolites. Rheology.

  3. Evaluation Written test in frequency or final examination with a minimal mark of 10/20. Writing of a small monograph (10 to 15 page) about topics to distribute. Bibliography Shaw, Introduction to Colloid and Surface Chemistry, 4th ed., Butterworth, Oxford, 1999 Adamson, Physical Chemistry of Surfaces, 6th ed., Wiley Interscience, New York, 1997 Hiemenz, Principles of Colloid and Surface Chemistry, 3rd ed., Marcel Dekker Inc., New York, 1997

  4. Colloidal Systems Colloidal systems: cosmetics; emulsions; foams; paints; plastics... Technological Importance Processes involved: detergency; flotation; Ion Exchange; lubrication; clarification of water; explosives (transport); Agriculture (agrochemicals); construction and repair of roads (asphalt)…..

  5. Important technologies Surface Chemistry in Pharmacy Surface Chemistry in Food and Feed Surface Chemistry in Detergency Surface Chemistry in Agriculture Surface and Colloid Chemistry in Photographic Technology Surface Chemistry in Paints Surface Chemistry of Paper Surface Chemistry in the Polymerization of Emulsion Colloidal Processing of Ceramics Surface Chemistry in Dispersion, Flocculation and Flotation Surface Chemistry in the Petroleum Industry

  6. Colloidal systems contain particles with dimensions of the order of 10-9 to 10-6 m. • Association Colloids: thermodynamically stable; ex. surfactant solution in water (micelles – c.m.c.) from a given temperature (kraft point). • Real solutions of macromolecules: thermodynamically stable; e.g. glue. • Colloidal dispersions: thermodynamically unstable due to the high interfacial tension.

  7. Formation of micelles

  8. Colloidal dispersions

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