Colloids in crossed electric and magnetic fields (B07)

• Fachliche Zuordnung: Experimentelle Physik der kondensierten Materie
• Förderung: Förderung von 2009 bis 2013
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 5485412

Whereas electric fields exert weak forces on both magnetic and non-magnetic colloids, magnetic fields act strongly and exclusively on magnetic colloids. We will make use of this difference to probe particle interactions in colloidal suspensions in an electric bottle, selectively addressing one particle species in a binary colloid mixture. The superposition of a second, either electrostatic or magnetostatic, field in parallel or normal direction allows to manipulate the motion of the charged/magnetic probe colloids within the “bath”. Increasing the volume fraction of the probe particles, or modifying the superimposed field while a structure is assembling will further elucidate the role of dipolar interaction, dielectrophoretic/electrophoretic forces, and field-induced non-linearities in structure formation and dynamics.

• DFG-Verfahren: Transregios
• Teilprojekt zu: TRR 6: Physik von kolloidalen Dispersionen in äußeren Feldern
• Antragstellende Institution: Heinrich-Heine-Universität Düsseldorf
• Mitantragstellende Institution: Max-Planck-Institut für Polymerforschung
• Teilprojektleiterinnen / Teilprojektleiter: Professor Dr. Hans-Jürgen Butt; Professorin Dr. Annette M. Schmidt, bis 3/2010; Professorin Dr. Doris Vollmer