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Special ICS Seminar:
Wetting and interfacial phenomena in colloid-polymer mixtures

Prof. Dr. Joseph Indekeu
Katholieke Universiteit Leuven, Institute for Theoretical Physics, Belgium

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07 Dec 2016 10:00
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07 Dec 2016 11:00
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PGI Lecture Hall, Building 04.8, Entrance E2, 2nd Floor, Rm 365

Abstract:

We discuss wetting layers in phase-separated colloid-polymer mixtures adsorbed at a vertical wall, observed in laser scanning confocal microscopy (LSCM) experiments. Matching of colloid and solvent dielectric properties renders van der Waals forces negligible and provides a system governed by short-range forces and thermal fluctuations. On this system the subtle predictions of renormalization group theory for wetting at the upper critical dimension d=3 can be tested [1]. We also discuss the contact line between the colloid-rich bulk liquid and an adsorbed thin film in this system by means of an interface displacement model. Calculated interface displacement profiles are compared to LSCM images and the line tension of the contact line is estimated [2].

1. J.O. Indekeu, D.G.A.L. Aarts, H.N.W. Lekkerkerker, Y. Hennequin and D. Bonn, “Thermal fluctuation forces and wetting layers in colloid-polymer mixtures: derivation of an interface potential”, Phys. Rev. E 81, 041604 (2010).
2. J. Koning, Y. Hennequin, D. Bonn and J.O. Indekeu, “Contact line of adsorbed colloid-polymer droplets in theory and experiment”, Soft Matter 12, 4052 (2016).

For a short bio of Prof. Joseph Indekeu, see:
http://www.ae-info.org/ae/Member/Indekeu_Joseph_Octave/CV

Contact

Dr. Kyongok Kang
Phone: +49 2461 61-6089
Fax: +49 2461 61-2280
email: k.kang@fz-juelich.de

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