Interfacial behavior of OEG-linear dendron monolayers: Aggregation, nanostructuring, and electropolymerizability

Mary Jane Felipe, Nicel Estillore, Roderick Borong Pernites, Thu Nguyen, Ramakrishna Ponnapati, Rigoberto C. Advincula

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We report on the interesting interfacial behavior of oligoethylene glycol or OEGylated linear dendron monolayers at the air-water interface as a function of (a) carbazole dendron generation, (b) the length of the OEG units, and (c) the surface pressure applied upon compression. Surface pressure-area isotherms, hysteresis studies, and isobaric creep measurement revealed a structure-property relationship consistent with the hydrophilic-lipophilic balance of a linear dendron with the OEG group serving as the surface anchor to the water subphase. AFM studies revealed that all the OEGylated carbazole dendrons self-assemble into spherical morphology at low surface pressures but form ribbonlike structures as the surface pressure is increased. This nanostructuring is primarily imparted by the increase in van der Waals forces with increasing amount of carbazole units per dendron generation on a hydrophilic mica surface. Further, electrochemical cross-linking of the carbazole molecules by cyclic voltammetery (CV) on doped Si wafer has enabled the formation of an LB film monolayer with a secondary level of organization in the monolayer imparted by the inter- and intramolecular cross-linking among the carbazole units. This study should provide a basis for monolayer film materials based on combining the LB technique and electrochemical cross-linking for nanostructuring superstructures at the air-water interface.

Original languageEnglish
Pages (from-to)9327-9336
Number of pages10
JournalLangmuir
Volume27
Issue number15
DOIs
Publication statusPublished - 2011 Aug 2
Externally publishedYes

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Felipe, M. J., Estillore, N., Pernites, R. B., Nguyen, T., Ponnapati, R., & Advincula, R. C. (2011). Interfacial behavior of OEG-linear dendron monolayers: Aggregation, nanostructuring, and electropolymerizability. Langmuir, 27(15), 9327-9336. https://doi.org/10.1021/la200916n