Nanomechanical Properties of Arachidic Acid Langmuir−Blodgett Films
| Autor: | Fausto Sanz, J. Torrent-Burgués, Gerard Oncins |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
chemistry.chemical_classification
Chemistry Analytical chemistry Force spectroscopy Langmuir–Blodgett film Surfaces Coatings and Films Electronic Optical and Magnetic Materials symbols.namesake chemistry.chemical_compound Crystallography General Energy Monolayer Microscopy symbols Arachidic acid Mica Physical and Theoretical Chemistry van der Waals force Alkyl |
| Zdroj: | The Journal of Physical Chemistry C. 112:1967-1974 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp0755544 |
| Popis: | The nanomechanical properties of Langmuir−Blodgett monolayers of arachidic acid extracted at surface pressures of 1, 15, and 35 mN/m and deposited on mica were investigated by atomic force microscopy, force spectroscopy, and lateral force microscopy. It was experimentally demonstrated that the arachidic acid molecular orientation depends on the extraction pressure. According to this, tilting angles of 50, 34, and 22° with respect to the surface perpendicular were detected and identified as conformations that maximize van der Waals interactions between the arachidic acid alkyl chains. The vertical force needed to puncture the monolayers with the AFM tip strongly depends on the molecular tilting angles attained at different monolayer extraction surface pressures, obtaining values that range from 13.07 ± 3.24 nN for 50° to 22.94 ± 5.49 nN for 22° tilting angles. The different molecular interactions involved in the monolayer cohesion are discussed and quantitatively related to the experimental monolayer break... |
| Databáze: | OpenAIRE |
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