Novel Surface Modes in Spinodal Decomposition
1997; American Physical Society; Volume: 79; Issue: 5 Linguagem: Inglês
10.1103/physrevlett.79.893
ISSN1092-0145
AutoresH. P. Fischer, Philipp Maass, W. Dieterich,
Tópico(s)nanoparticles nucleation surface interactions
ResumoWe study the spontaneous phase separation of a binary mixture in the presence of a flat wall, focusing on the early stage of the demixing kinetics. Based on a Ginzburg-Landau type approach, we show the existence of novel unstable concentration waves with wave vectors ${\stackrel{\ensuremath{\rightarrow}}{k}}_{\ensuremath{\parallel}}$ parallel to the wall, which are characterized by a surface dispersion relation ${\ensuremath{\omega}}_{s}({k}_{\ensuremath{\parallel}})$ and amplitudes $\overline{s}$ decaying exponentially into the bulk. The surface modes are superimposed on the laterally averaged concentration profile and are directly observable by experiment, if the wall right after a quench does not favor any of the two components of the mixture.
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