Glued Langmuir−Blodgett Bilayers from Calix[n]arenes: Influence of Calix[n]arene Size on Ionic Cross-Linking, Film Thickness, and Permeation Selectivity
| Autor: | Minghui Wang, Vaclav Janout, Steven L. Regen |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Bilayer
Ionic bonding Surfaces and Interfaces Permeation Condensed Matter Physics Langmuir–Blodgett film Homologous series chemistry.chemical_compound chemistry Pulmonary surfactant Polymer chemistry Electrochemistry Organic chemistry General Materials Science Selectivity Spectroscopy Probable mechanism |
| Zdroj: | Langmuir. 26:12988-12993 |
| ISSN: | 1520-5827 0743-7463 |
| Popis: | A homologous series of calix[4]arene-, calix[5]arene-, and calix[6]arene-based surfactants, containing pendant trimethylammonium and n-hexadecyl groups, have been compared with respect to their ability (i) to undergo ionic cross-linking at the air/water interface, (ii) to incorporate poly(4-styrenesulfonate) (PSS) in Langmuir-Blodgett (LB) bilayers, and (iii) to act as barriers toward He, N(2), and CO(2) when assembled into cross-linked LB bilayers. As these calix[n]arenes increase in size, their ability to undergo ionic cross-linking has been found to increase, the thickness of corresponding glued LB bilayers has been found to decrease, and their barrier properties and permeation selectivities have been found to increase. The likely origin for these effects and the probable mechanism by which He, N(2), and CO(2) cross these ultrathin films are discussed. |
| Databáze: | OpenAIRE |
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