Emmie Lucassen-Reynders

Emmie Helena Lucassen-Reynders, last name Reijnders in Dutch spelling, (25 February 1935 – 27 January 2023) was a Dutch scientist specialising in colloid chemistry and theoretical physics. She worked in both academia and in industry.

Early life and education Lucassen-Reynders was born in Vught. Her parents were both teachers who met in Zaandam during World War I. Lucassen-Reynders attended the municipal gymnasium in 's-Hertogenbosch and started her study of chemistry at Utrecht University in 1952. She continued to investigate the surface equation of state for solutions with surfactants, considering both ionic and non-ionic surfactants. and used the concept of surface electroneutrality to understand how mixing anionic and cationic surfactants impacted adsorption and surface pressure.

In 1969, Lucassen-Reynders moved to England, where she researched surface elasticity and viscosity. She studied food emulsions, with a focus on interfacial viscoelasticity and emulsification. She moved back to the Netherlands in 1986 and continued her research in the Physical Chemistry group at Unilever Research in Vlaardingen until her retirement in 1997. Lucassen-Reynders remained active after her retirement, supervising PhD students and continuing to publish. Much of Lucassen-Reynders’ life work was recognised in an Honorary Note in the leading journal of her field. Together they had two daughters.

Selected publications

Anionic surfactants: Physical chemistry of surfactant action Lucassen-Reynders, E. H. Publisher:M. Dekker, 1981 Lucassen-Reynders EH, van den Tempel M. Stabilization of water in oil emulsions by solid particles. J Phys Chem 1963;67:731. Lucassen-Reynders EH. Contact angles and adsorption on solids. J Phys Chem 1963;67:969. Lucassen-Reynders EH, van den Tempel M. Surface equation of state for adsorbed surfactants. Proceedings IVth International Congress on Surface Active Substances, Brussels; 1964. Lucassen-Reynders EH. Surface equation of state for ionized surfactants. J Phys Chem 1966;70:1777. Lucassen-Reynders EH. & Lucassen, J. 1969 Properties of capillary waves. Adv. Colloid Interface Sci. 2, 347–395. Lucassen-Reynders EH. A surface equation of state for mixed surfactant monolayers. J Colloid Interface Sci 1972;41:156. Lucassen-Reynders EH. Surface properties of mixed anionic/cationic surfactant solutions. Kolloid-Z Z Polym 1972;250:356. Lucassen-Reynders EH, Lucassen J, Giles D. Surface and bulk properties of mixed anionic/cationic surfactant systems, I. Equilibrium surface properties. J Colloid Interface Sci 1981;81:150. Fainerman VB, Lucassen-Reynders EH. Adsorption of single and mixed ionic surfactants at fluid interfaces. Adv Colloid Interface Sci 2002;96:295. van den Tempel M, Lucassen-Reynders EH. Relaxation processes at fluid interfaces. Adv Colloid Interface Sci 1983;18:281. Lucassen-Reynders EH. Dynamic interfacial properties in emulsification. In: Becher P, editor. Encyclopedia of Emulsion Technology, vol. 4. New York: Dekker; 1996. Lucassen-Reynders EH. Competitive adsorption of emulsifiers, 1. Theory for adsorption of small and large molecules. Colloids Surf, A 1994;91:79. Benjamins J, Lucassen-Reynders EH. Surface dilational rheology of proteins adsorbed at air/water and oil/water interfaces. In: Möbius D, Miller R, editors. Proteins at Liquid Interfaces. Amsterdam: Elsevier Science B.V.; 1998. p. 341. Lucassen-Reynders EH, Benjamins J. Dilational rheology of proteins adsorbed at fluid interfaces. Current Opinion in Colloid & Interface Science Volume 15, Issue 4, August 2010, Pages 264-270. Fainerman VB, Lucassen-Reynders EH, Miller R. Description of the adsorption behaviour of proteins at water/fluid interfaces in the framework of a two- dimensional solution model. Adv Colloid Interface Sci 2003;106:237. Lucassen-Reynders EH, Fainerman VB, Miller R. Surface dilational modulus or gibbs' elasticity of protein adsorption layers J Phys Chem B 2004;108:9173.