Molecular ordering of the discotic liquid crystal HAT6 confined in mesoporous solids

Całus, S.; Kityk, A. V.; Huber, Patrick

doi:10.1016/j.micromeso.2014.05.036

Cited by 14 publications

(19 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In comparison to this, in the aluminium oxide nanochannel, the molecules form the same helical columns but are aligned perpendicularly to the channel, which can be explained by either log pile configuration or radial configuration. Both of the log pile and radial configurations have already been reported previously ,,,. Due to the topological frustration arising from the restricted geometry, the inside core part orientations were suggested either of axial or isotropic state.…”

Section: Resultssupporting

confidence: 60%

“…Both of the log pile and radial configurations have already been reported previously. [32,36,40,41] Due to the topological frustration arising from the restricted geometry, the inside core part orientations were suggested either of axial or isotropic state. In Figure 3b, there is no (200) diffraction in χ0°, 180°which indicates the isotropic core orientation.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Manipulation of Supramolecular Columnar Structures of H‐Bonded Donor‐Acceptor Units through Geometrical Nanoconfinement

et al. 2019

View full text Add to dashboard Cite

Ambipolar organic semiconductors are considered promising for organic electronics because of their interesting electric properties. Many hurdles remain yet to be overcome before they can be used for practical applications, especially because their orientation is hard to control. We demonstrate a method to control the orientation of columnar structures based on a hydrogen (H)‐bonded donor‐acceptor complex between a star‐shaped tris(triazolyl)triazine and triphenylene‐containing benzoic acid, using physicochemical nanoconfinement. The molecular configuration and supramolecular columnar assemblies in a one‐dimensional porous anodic aluminium oxide (AAO) film were dramatically modulated by controlling the pore‐size and by chemical modification of the inner surface of the porous AAO film. In situ experiments using grazing‐incidence X‐ray diffraction (GIXRD) were carried out to investigate the structural evolution produced at the nanometer scale by varying physicochemical conditions. The resulting highly ordered nanostructures may open a new pathway to effectively control the alignment of liquid crystal ambipolar semiconductors.

show abstract

Section: Resultssupporting

confidence: 60%

Section: Resultsmentioning

confidence: 99%

Manipulation of Supramolecular Columnar Structures of H‐Bonded Donor‐Acceptor Units through Geometrical Nanoconfinement

et al. 2019

View full text Add to dashboard Cite

show abstract

“…temperature (liquid) phase is believed to be nucleated at the pore wall and hence the movement of the front boundary is opposite to the scenario outlined in Ref. [277,285] for the melting of the columnar discotic state.…”

Section: Thermotropic Liquid Crystalline Ordermentioning

confidence: 81%

Soft matter in hard confinement: phase transition thermodynamics, structure, texture, diffusion and flow in nanoporous media

Huber

2015

J. Phys.: Condens. Matter

Self Cite

248

287

View full text Add to dashboard Cite

Spatial confinement in nanoporous media affects the structure, thermodynamics and mobility of molecular soft matter often markedly. This article reviews thermodynamic equilibrium phenomena, such as physisorption, capillary condensation, crystallisation, self-diffusion, and structural phase transitions as well as selected aspects of the emerging field of spatially confined, non-equilibrium physics, i.e. the rheology of liquids, capillarity-driven flow phenomena, and imbibition front broadening in nanoporous materials. The observations in the nanoscale systems are related to the corresponding bulk phenomenologies. The complexity of the confined molecular species is varied from simple building blocks, like noble gas atoms, normal alkanes and alcohols to liquid crystals, polymers, ionic liquids, proteins and water. Mostly, experiments with mesoporous solids of alumina, gold, carbon, silica, and silicon with pore diameters ranging from a few up to 50 nm are presented. The observed peculiarities of nanopore-confined condensed matter are also discussed with regard to applications. A particular emphasis is put on texture formation upon crystallisation in nanoporous media, a topic both of high fundamental interest and of increasing nanotechnological importance, e.g. for the synthesis of organic/inorganic hybrid materials by melt infiltration, the usage of nanoporous solids in crystal nucleation or in template-assisted electrochemical deposition of nano structures.

show abstract

“…Cooperative ordering of the nanoconfined LC phases results in macroscopic birefringence which in most cases substantially dominates a geometrical birefringence caused by an elongated pore geometry. This effect has been demonstrated in numerous experimental studies performed, particularly, on nanocomposites with rod-like [1,2] and disc-like [3,4] molecules of achiral nematics as well as their chiral counterparts, cholesterics [5] and ferroelectric LC materials [6], representing guest component in host alumina (pAl 2 O 3 ) or silica (pSiO 2 ) nanoporous templates. Accordingly, the LC based nanocomposites with tailored optical anisotropy continue to be an interesting problem for both basic science and for technological reasons.…”

Section: Introductionmentioning

confidence: 79%

Molecular Ordering of Nematic Liquid Crystals in Tubular Nanopores: Tailoring of Optical Anisotropy at the Nanoscale by Polymer Pore-surface Grafting

Kityk

Lelonek²,

Huber

et al. 2018

2018 IEEE 8th International Conference Nanomaterials: Application &Amp; Properties (NAP)

Self Cite

View full text Add to dashboard Cite

The optical polarimetry technique is used to explore molecular ordering of nematic liquid crystals 5FPFFPP3 embedded in parallel cylindrical channels of alumina membranes with pore walls covered by a SE-1211 polymer film enhancing normal anchoring. A chemical film deposition from organic solution apparently results in inhomogeneous coverage with local islands on the channels walls. Accordingly, a coexistence of differently ordered LC regions (nanodomains), characterized by positive and negative anisotropy, results in a weak effective (average) optical birefringence. Repeated polymer deposition reduces the size of uncovered pore walls regions and thus leads to a strengthening of negative optical anisotropy observed in the experiments.

show abstract

Molecular ordering of the discotic liquid crystal HAT6 confined in mesoporous solids

Cited by 14 publications

References 17 publications

Manipulation of Supramolecular Columnar Structures of H‐Bonded Donor‐Acceptor Units through Geometrical Nanoconfinement

Manipulation of Supramolecular Columnar Structures of H‐Bonded Donor‐Acceptor Units through Geometrical Nanoconfinement

Soft matter in hard confinement: phase transition thermodynamics, structure, texture, diffusion and flow in nanoporous media

Molecular Ordering of Nematic Liquid Crystals in Tubular Nanopores: Tailoring of Optical Anisotropy at the Nanoscale by Polymer Pore-surface Grafting

Contact Info

Product

Resources

About