title: Mixing behavior and interphase formation in the diethylene triamine-water system studied by optical imaging and spatially resolved Brillouin scattering.
abstract: The injection of water beneath liquid diethylene triamine in a glass cuvette leads to an unexpected phase evolution behavior of the two liquids. The space and time dependent developments of the molecular structure and the underlying transport associated with mixing of the two liquids are monitored by optical imaging and scanning Brillouin microscopy. Apparently, results obtained by either experimental technique lead to disparate interpretations. Whereas optical imaging suggests the existence of a two phase structure, which disappears within a few hours, acoustic microscopy indicates the evolution of a more gradually evolving and longer-lived three phase structure. According to molecular acoustics, the transport of diethylene triamine into water and vice versa behaves strongly asymmetric in time. An attempt is made to reconcile the observed optical and acoustic manifestations of the mixing process on the basis of molecular complex formation.
authors.affiliation: Laboratoire de Physique des Matériaux, University of Luxembourg, Luxembourg, Luxembourg. martine.philipp@uni.lu
authors.forename: Martine
authors.initials: M
authors.lastname: Philipp
authors.forename: Florimond
authors.initials: F
authors.lastname: Collette
authors.forename: Michael
authors.initials: M
authors.lastname: Veith
authors.forename: Pierre
authors.initials: P
authors.lastname: Seck
authors.forename: Roland
authors.initials: R
authors.lastname: Sanctuary
authors.forename: Ulrich
authors.initials: U
authors.lastname: Müller
authors.forename: John
authors.initials: J
authors.lastname: Kieffer
authors.forename: Jan K
authors.initials: JK
authors.lastname: Krüger