Stability and phase separation in mixed self-assembled monolayers

S. N. Yaliraki, Gabriel Longo, Ella Gale, I. Szleifer, Mark A Ratner

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Recent single molecule experiments rely on the self-assembly of binary mixtures of molecules with very different properties in a stable monolayer, in order to probe the characteristics of the interspersed molecule of interest in a controlled environment. However, not all efforts at coassembly have been successful. To study systematically the behavior of such systems, we derive the free energy of multicomponent systems of rods with configurational degrees of freedom, localized on a surface, starting from a generalized van der Waals description. The molecular parameters are determined by geometrical factors of the molecules and by their pairwise van der Waals interactions computed using molecular mechanics. Applying the model to two experimental situations, we are able to use the stability analysis of the respective mixtures to explain why coassembly was successful in one set of experiments (carotene and alkanethiol) and not in another (benzenethiols and alkanethiol). We outline general guidelines for suitable choices of molecules to achieve coassembly.

Original languageEnglish
Article number074708
JournalJournal of Chemical Physics
Volume125
Issue number7
DOIs
Publication statusPublished - 2006

Fingerprint

Self assembled monolayers
Phase separation
Molecules
molecules
carotene
Molecular mechanics
Carotenoids
Binary mixtures
Self assembly
binary mixtures
Free energy
self assembly
Monolayers
rods
degrees of freedom
Experiments
free energy
probes
interactions

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Stability and phase separation in mixed self-assembled monolayers. / Yaliraki, S. N.; Longo, Gabriel; Gale, Ella; Szleifer, I.; Ratner, Mark A.

In: Journal of Chemical Physics, Vol. 125, No. 7, 074708, 2006.

Research output: Contribution to journalArticle

Yaliraki, S. N. ; Longo, Gabriel ; Gale, Ella ; Szleifer, I. ; Ratner, Mark A. / Stability and phase separation in mixed self-assembled monolayers. In: Journal of Chemical Physics. 2006 ; Vol. 125, No. 7.
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