Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1233623 | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 2009 | 6 Pages |
Abstract
Confinement of 4-n-octyl-4â²-cyanobiphenyl (8CB) to nanoporous molecular sieves with hexagonal structure of cylindrical pores (4.6Â nm diameter) is studied. Thermogravimetric investigations have indicated that the pores are completely filled. Several surface species inside the pores and onto the external surface of the grains were demonstrated by differential thermal analysis and by in situ infrared spectroscopy. Arguments are given that bulk-like monomer and dimer species along with hydrogen bonded ones might coexist in the so-called surface layer, but their population varies drastically as function of the temperature. In addition, chemical changes of the confined liquid crystal are quite possible inside these nanopores, at temperatures lower than for the bulk.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Ligia Frunza, Stefan Frunza, Marian Poterasu, Traian Beica, Hendrik Kosslick, Daniel Stoenescu,