Wettabilities of Organosiloxane Thin Films Derived from SiCl3-Terminated Carbosilane Dendrons on Mica

Autor:	Aurelie Mayeux, Chi Ming Yam, Chengzhi Cai, and Alexandra Milenkovic
Rok vydání:	2002
Předmět:	Materials science Surfaces and Interfaces Adhesion Hexadecane Condensed Matter Physics chemistry.chemical_compound chemistry Chemical engineering Squalane Dendrimer Monolayer Polymer chemistry Electrochemistry Surface roughness General Materials Science Mica Thin film Spectroscopy
Zdroj:	Langmuir. 18:10274-10278
ISSN:	1520-5827 0743-7463
DOI:	10.1021/la026415a
Popis:	We prepared submonolayers, monolayers, and multilayers of organosiloxanes derived from the second to fourth generation (G2−G4) SiCl3-terminated carbosilane dendrons on mica by spin-casting. The surface properties of these films, such as wettabilities, surface tensions, works of adhesion with various liquids, pore size, and surface coverage, were investigated by means of contact-angle measurements. All G2−G4 films exhibit high hysteresis of ∼20°, probably due to molecular scale chemical heterogeneity and surface roughness. The surface tensions of the G2−G4 monolayers are similar: γS (total) = ∼29 mJ/m2, γSd (dispersive) = ∼24 mJ/m2, and γSp (polar) = ∼5 mJ/m2. However, only γSd (∼21 mJ/m2) contributes to the surface tensions of the multilayers, suggesting that the underlying polar mica substrate is significantly screened by the dendron multilayers. Works of adhesion (WSL) for water, glycerol, dimethylformamide, methylene iodide, squalane, and hexadecane on the films were measured. The multilayers exhibit ...
Databáze:	OpenAIRE
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