Journal
ACS NANO
Volume 6, Issue 11, Pages 9359-9365Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn302937t
Keywords
discotic liquid crystals; confinement; nanoporous aluminum oxide; supramolecular wires
Categories
Funding
- European Union
- NSRF
- German Research Foundation [SPP 1369, BU 1556/31-1, STE 1127/13, INST 190/134-1]
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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,cif,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.
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