A Langmuir-Schaefer approach for the synthesis of highly ordered organoclay thin films
| dc.contributor.author | Toma, L. M. | en |
| dc.contributor.author | Gengler, R. Y. N. | en |
| dc.contributor.author | Prinsen, E. B. | en |
| dc.contributor.author | Gournis, D. | en |
| dc.contributor.author | Rudolf, P. | en |
| dc.date.accessioned | 2015-11-24T17:32:42Z | |
| dc.date.available | 2015-11-24T17:32:42Z | |
| dc.identifier.issn | 1463-9076 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/13770 | |
| dc.rights | Default Licence | - |
| dc.subject | alkylammonium cations | en |
| dc.subject | blodgett method | en |
| dc.subject | hybrid films | en |
| dc.subject | clay | en |
| dc.subject | macrocycles | en |
| dc.subject | amphiphiles | en |
| dc.subject | monolayers | en |
| dc.title | A Langmuir-Schaefer approach for the synthesis of highly ordered organoclay thin films | en |
| heal.abstract | The Langmuir-Schaefer (LS) method has been investigated as a means to control the structure of hybrid organoclay thin films consisting of montmorillonite and dimethyldioctadecylammonium (DODA) cations. We observed a significant modification of the compression isotherms as a function of clay mineral concentration in the subphase, implying clay interaction with the alkylammonium monolayer. For a particular range of clay concentrations, LS hybrid monolayers could be readily prepared on a hydrophobic substrate. The structure of hybrid multilayers of DODA and clay platelets, prepared by repeated LS deposition, was found to be governed by the synthetic route: when the multilayer is fabricated by transferring the hybrid Langmuir films from the surface of the clay dispersion, the DODA-clay particles "flip over'' while passing through the meniscus during the even cycles of the deposition, as demonstrated from the elemental analysis of the surface by X-ray photoelectron spectroscopy. In our new model for these multilayers, the structural building block consists therefore of two interdigited DODA layers and two clay layers held together by Na(+). Additionally, a minority phase forms, probably differing from the majority one in the conformation of the alkylammonium cations, and can be eliminated by annealing. This deposition procedure leads to a less ordered structure than an alternative route which combines LS deposition and self-assembly to produce a multilayer consisting of two interdigited DODA layers and one clay layer: here the hydrophilic surface of the transferred hybrid Langmuir film is converted to a hydrophobic surface by dipping into a solution of DODA cations before proceeding with the LS deposition of the next layer. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | Doi 10.1039/C0cp00286k | - |
| heal.identifier.secondary | <Go to ISI>://000282103200043 | - |
| heal.journalName | Physical Chemistry Chemical Physics | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2010 | - |
| heal.publisher | Royal Society of Chemistry | en |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Επιστήμης Υλικών | el |
| heal.type | journalArticle | - |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.type.en | Journal article | en |
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