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Structure and phase behavior of a discotic columnar liquid crystal confined in nanochannels

  • The confinement of discotic columnar liquid crystal in nanoporous templates is a promising strategy to design nanofibers with potential applications in organic electronics. However, for many materials, geometric nanoconfinement has been shown to induce significant modifications of the physical properties, such as structure or phase behavior. We address the case of a discotic columnar liquid crystal confined in various templates. The influence of the size, the roughness, and the chemical nature of pores was investigated for a pyrene derivative by small-angle neutron scattering, X-ray diffraction, and calorimetry on a wide range of temperatures. A homeotropic anchoring (face-on orientation of the disk-shape molecules at the interface) is favored in all smooth cylindrical nanochannels of porous alumina while surface roughness of porous silicon promotes more disordered structures. The hexagonal columnar–isotropic phase transition is modified as a result of geometrical constraints andThe confinement of discotic columnar liquid crystal in nanoporous templates is a promising strategy to design nanofibers with potential applications in organic electronics. However, for many materials, geometric nanoconfinement has been shown to induce significant modifications of the physical properties, such as structure or phase behavior. We address the case of a discotic columnar liquid crystal confined in various templates. The influence of the size, the roughness, and the chemical nature of pores was investigated for a pyrene derivative by small-angle neutron scattering, X-ray diffraction, and calorimetry on a wide range of temperatures. A homeotropic anchoring (face-on orientation of the disk-shape molecules at the interface) is favored in all smooth cylindrical nanochannels of porous alumina while surface roughness of porous silicon promotes more disordered structures. The hexagonal columnar–isotropic phase transition is modified as a result of geometrical constraints and interfacial interactions.zeige mehrzeige weniger

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Metadaten
Autor*innen:C. Cerclier, M. Ndao, R. Busselez, R. Lefort, E. Grelet, P. Huber, A.V. Kityk, L. Noirez, Andreas SchönhalsORCiD, D. Morineau
Dokumenttyp:Zeitschriftenartikel
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):The journal of physical chemistry / C
Jahr der Erstveröffentlichung:2012
Herausgeber (Institution):American Chemical Society
Verlag:Soc.
Verlagsort:Washington, DC
Jahrgang/Band:116
Ausgabe/Heft:35
Erste Seite:18990
Letzte Seite:18998
DOI:10.1021/jp303690q
ISSN:1932-7447
ISSN:1089-5639
Verfügbarkeit des Dokuments:Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
Bibliotheksstandort:Sonderstandort: Publica-Schrank
Datum der Freischaltung:19.02.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:26.10.2012
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