Abstract
Structure formation, phase behavior, and dynamics of mono-bromo hexa-peri-hexabenzocoronene (HBC-Br) are strongly affected by the confinement of cylindrical nanopores with rigid walls. Using self-ordered nanoporous anodic aluminum oxide (AAO)-containing arrays of aligned nanopores with narrow size distribution as a confining matrix, pronounced alignment of the HBC-Br columns along the nanopore axes was found to be independent of the pore diameter. Hence, arrays of one-dimensional supramolecular HBC-Br wires with the columns uniformly oriented along the wire axes on a macroscopic scale were obtained, unlike with discotics bearing smaller cores. The formation of the crystalline herringbone structure is shifted to lower temperatures in nanopores with diameters of a few hundred nanometers, whereas the formation of this low-temperature phase is completely suppressed when the pore diameter is below 20 lattice parameters. Moreover, the cylindrical confinement affects the disk axial dynamics as well as the distribution of relaxation times.
Original language | English (US) |
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Pages (from-to) | 9359-9365 |
Number of pages | 7 |
Journal | ACS Nano |
Volume | 6 |
Issue number | 11 |
DOIs | |
State | Published - Nov 27 2012 |
Externally published | Yes |
Keywords
- confinement
- discotic liquid crystals
- nanoporous aluminum oxide
- supramolecular wiresf
ASJC Scopus subject areas
- General Engineering
- General Materials Science
- General Physics and Astronomy