Thermal properties and vibrational density of states of a nanoconfined discotic liquid crystal

Collective orientational order and phase behavior of a discotic liquid crystal under nanoscale confinement

“…3 Hence, several investigations have been carried out to elucidate the phase behavior and molecular ordering of DLCs conned within the nanopores of metal oxide membranes. [7][8][9][13][14][15] Compared to bulk DLCs, a decrease in phase transition temperatures is observed alongside the formation of additional structures under connement that have been reported for pyrene-and triphenylene-based DLCs. 8,9,14 On the other hand, controlling the molecular ordering within pore structures is highly desirable for improving application relevant properties such as conductivity and light harvesting abilities.…”

“…8 The conned samples were prepared as outlined in ref. 8. In short, the membranes were outgassed in a vacuum of 10 À4 mbar at 473 K for 12 hours, to clean the pores and remove adsorbed water.…”

“…As the alkyl chains ll the intercolumnar space and act as an insulator, the columns can be considered as isolated, onedimensional, conducting nanowires. [7][8][9] This makes DLCs promising materials for electronic applications such as in organic eld effect transistors (OFETs), organic light emitting diodes (OLEDs) and organic photovoltaics (OPVs). 3,6,10 DLCs can also be nanoconned into a specic geometry, i.e.…”

“…This is due to the fact that investigations on such conned systems can address fundamental properties such as phase behavior and glass transition dynamics, whilst also helping to shed light upon the structure-property relationship of so matter under connement. 8,9 Moreover, from an application stand point, it opens up the possibility to prepare nanowires through dissolution of the host membrane. 11 Nanoconnement inuences the properties of DLCs like for other so mater systems 12 which have to be revealed for applications at the nanoscale.…”

Quasi- and inelastic neutron scattering to investigate the molecular dynamics of discotic molecules in the bulk

“…For a more detailed discussion see reference [8]. Moreover the influence of a hard nanometer confinement on the Boson Peak of HAT6 is considered in reference [20].…”