All Outputs (76)

Twist-bend nematic phase in cyanobiphenyls and difluoroterphenyls bimesogens (2016)
Journal Article
Panov, V. P., Vij, J. K., & Mehl, G. H. (2017). Twist-bend nematic phase in cyanobiphenyls and difluoroterphenyls bimesogens. Liquid crystals, 44(1), 147-159. https://doi.org/10.1080/02678292.2016.1254289

The paper reviews assignment of the low-temperature nematic phase observed in simple bimesogenic or dimeric systems based on cyanobiphenyls and difluoroterphenyls to the twist-bend nematic phase, NTB, using a range of experimental techniques. These i... Read More about Twist-bend nematic phase in cyanobiphenyls and difluoroterphenyls bimesogens.

Light scattering study of the “pseudo-layer” compression elastic constant in a twist-bend nematic liquid crystal (2016)
Journal Article
Parsouzi, Z., Pardaev, S. A., Welch, C., Ahmed, Z., Mehl, G. H., Baldwin, A. R., …Sprunt, S. (2016). Light scattering study of the “pseudo-layer” compression elastic constant in a twist-bend nematic liquid crystal. Physical chemistry chemical physics : PCCP, 18(46), 31645-31652. https://doi.org/10.1039/C6CP06292J

The nematic twist-bend (TB) phase, exhibited by certain achiral thermotropic liquid crystalline (LC) dimers, features a nanometer-scale, heliconical rotation of the average molecular long axis (director) with equally probable left- and right-handed d... Read More about Light scattering study of the “pseudo-layer” compression elastic constant in a twist-bend nematic liquid crystal.

Director configuration in the twist-bend nematic phase of CB11CB (2016)
Journal Article
Miglioli, I., Bacchiocchi, C., Arcioni, A., Kohlmeier, A., Mehl, G. H., & Zannoni, C. (2016). Director configuration in the twist-bend nematic phase of CB11CB. Journal of Materials Chemistry C, 4(41), 9887-9896. https://doi.org/10.1039/c6tc03246j

The director distribution in the nematic phases exhibited by the 100,1100-bis(4-cyanobiphenyl-40-yl)undecane (CB11CB) liquid crystal has been studied in the bulk with the EPR spin probe technique. EPR spectra confirmed the presence of an higher tempe... Read More about Director configuration in the twist-bend nematic phase of CB11CB.

Deuteron and proton NMR study of D₂, p-dichlorobenzene and 1,3,5-trichlorobenzene in bimesogenic liquid crystals with two nematic phases (2016)
Journal Article
Burnell, E. E., Ahmed, Z., Welch, C., Mehl, G. H., & Dong, R. Y. (2016). Deuteron and proton NMR study of D₂, p-dichlorobenzene and 1,3,5-trichlorobenzene in bimesogenic liquid crystals with two nematic phases. Chemical Physics Letters, 659, 48-54. https://doi.org/10.1016/j.cplett.2016.07.005

The solutes dideuterium, 1,3,5-trichlorobenzene and p-dichlorobenzene (pdcb) are co-dissolved in a 61/39 wt% mixture of CBC9CB/5CB, a bimesogenic liquid crystal with two nematic phases. NMR spectra are collected for each solute. The local electric fi... Read More about Deuteron and proton NMR study of D₂, p-dichlorobenzene and 1,3,5-trichlorobenzene in bimesogenic liquid crystals with two nematic phases.

Mesophase structure and behaviour in bulk and restricted geometry of a dimeric compound exhibiting a nematic-nematic transition (2016)
Journal Article
Sebastián, N., Tamba, M. G., Stannarius, R., de la Fuente, M. R., Salamonczyk, M., Cukrov, G., …Eremin, A. (2016). Mesophase structure and behaviour in bulk and restricted geometry of a dimeric compound exhibiting a nematic-nematic transition. Physical chemistry chemical physics : PCCP, 18(28), 19299-19308. https://doi.org/10.1039/c6cp03899a

We present structural studies of a dimeric compound composed of a central heptyl spacer linking two mesogens consisiting of terphenyl units at which two adjacent fluoro groups are attached to each central ring. The terminal rings are linked to pentyl... Read More about Mesophase structure and behaviour in bulk and restricted geometry of a dimeric compound exhibiting a nematic-nematic transition.

Fluctuation modes of a twist-bend nematic liquid crystal (2016)
Journal Article
Parsouzi, Z., Shamid, S. M., Borshch, V., Challa, P. K., Baldwin, A. R., Tamba, M. G., …Sprunt, S. (2016). Fluctuation modes of a twist-bend nematic liquid crystal. Physical Review X, 6(2), 021041-1-021041-16. https://doi.org/10.1103/PhysRevX.6.021041

We report a dynamic light-scattering study of the fluctuation modes in a thermotropic liquid crystalline mixture of monomer and dimer compounds that exhibits the twist-bend nematic (NTB) phase. The results reveal a spectrum of overdamped fluctuations... Read More about Fluctuation modes of a twist-bend nematic liquid crystal.

Anomalous increase in nematic-isotropic transition temperature in dimer molecules induced by magnetic field (2016)
Journal Article
Salili, S. M., Tamba, M. G., Sprunt, S. N., Welch, C., Mehl, G. H., Jákli, A., & Gleeson, J. T. (2016). Anomalous increase in nematic-isotropic transition temperature in dimer molecules induced by magnetic field. Physical review letters, 116(21-27 May), Article 217801. https://doi.org/10.1103/PhysRevLett.116.217801

We have determined the nematic-isotropic transition temperature as a function of applied magnetic field in three different thermotropic liquid crystalline dimers. These molecules are comprised of two rigid calamitic moieties joined end to end by flex... Read More about Anomalous increase in nematic-isotropic transition temperature in dimer molecules induced by magnetic field.

Similarities and differences between molecular order in the nematic and twist-bend nematic phases of a symmetric liquid crystal dimer (2016)
Journal Article
Emsley, J. W., Lelli, M., Joy, H., Tamba, M. G., & Mehl, G. H. (2016). Similarities and differences between molecular order in the nematic and twist-bend nematic phases of a symmetric liquid crystal dimer. Physical chemistry chemical physics : PCCP, 18(14), 9419-9430. https://doi.org/10.1039/c5cp07304a

The order parameter, Szz, where z is the para axis of the difluoroterphenyl groups in DTC5C9, have been obtained from chemical shift anisotropies measured by ¹³C – {¹1H} NMR experiments at temperatures throughout the nematic, NU, and twist-bend nemat... Read More about Similarities and differences between molecular order in the nematic and twist-bend nematic phases of a symmetric liquid crystal dimer.

Thermal optical non-linearity of nematic mesophase enhanced by gold nanoparticles – an experimental and numerical investigation (2016)
Journal Article
Kurochkin, O., Murugesan, Y. K., Bennett, T. P., D'Alessandro, G., Reznikov, Y., Tang, B. J., …Kaczmarek, M. (2016). Thermal optical non-linearity of nematic mesophase enhanced by gold nanoparticles – an experimental and numerical investigation. Physical chemistry chemical physics : PCCP, 18(16), 11503-11512. https://doi.org/10.1039/c6cp00116e

In this work the mechanisms leading to the enhancement of optical nonlinearity of nematic liquid crystalline material through localized heating by doping the liquid crystals (LCs) with gold nanoparticles (GNPs) are investigated. We present some exper... Read More about Thermal optical non-linearity of nematic mesophase enhanced by gold nanoparticles – an experimental and numerical investigation.

Synthesis and characterization of gold nanoparticles functionalized with calamitic mesogens (2016)
Journal Article
Cseh, L., & Mehl, G. H. (2016). Synthesis and characterization of gold nanoparticles functionalized with calamitic mesogens. 00 Journal not listed, 61(2), 125-130

(Image presented) Liquid-crystalline nanoparticles represent an exciting class of new materials for a variety of potential applications. By combining supramolecular ordering with the fluid properties of the liquid-crystalline state, these materials o... Read More about Synthesis and characterization of gold nanoparticles functionalized with calamitic mesogens.

The stabilisation of the Nx phase in mixtures (2016)
Journal Article
Ramou, E., Ahmed, Z., Welch, C., Karahaliou, P. K., & Mehl, G. H. (2016). The stabilisation of the Nx phase in mixtures. Soft matter, 12(3), 888-899. https://doi.org/10.1039/c5sm01961c

The phase behaviour of mixtures between two symmetric dimers, CBC9CB and the ether-linked analogue CBOC9OCB was investigated by Polarizing Optical Microscopy (POM), Differential Scanning Calorimetry (DSC) and X-Ray Diffraction (XRD) studies. The dime... Read More about The stabilisation of the Nx phase in mixtures.

The design and investigation of the self-assembly of dimers with two nematic phases (2015)
Journal Article
Ahmed, Z., Welch, C., & Mehl, G. H. (2015). The design and investigation of the self-assembly of dimers with two nematic phases. RSC advances, 5(113), 93513-93521. https://doi.org/10.1039/c5ra18118f

A series of non-symmetric dimers were synthesised containing either cyanobiphenyl or difluoroterphenyl moieties on one side and a range of long, short, bent, polar or apolar mesogens on the other side of the molecules. The dielectric anisotropy of th... Read More about The design and investigation of the self-assembly of dimers with two nematic phases.

Helically twisted chiral arrays of gold nanoparticles coated with a cholesterol mesogen (2015)
Journal Article
Cseh, L., Mang, X., Zeng, X., Liu, F., Mehl, G., Ungar, G., & Siligardil, G. (2015). Helically twisted chiral arrays of gold nanoparticles coated with a cholesterol mesogen. Journal of the American Chemical Society, 137(40), 12736-12739. https://doi.org/10.1021/jacs.5b05059

© 2015 American Chemical Society. Gold nanoparticles have been prepared and surface-functionalized with a 1:1 molar mixture of a hexylthiol ligand and a chiral mesogenic ligand consisting of a cholesterylbenzoate attached via an undecylthiol spacer.... Read More about Helically twisted chiral arrays of gold nanoparticles coated with a cholesterol mesogen.

Mononuclear Cu(II) complexes of novel salicylidene Schiff bases: synthesis and mesogenic properties (2015)
Journal Article
Cretu, C., Cseh, L., Tang, B. J., Sasca, V., Badea, V., Szerb, E. I., …Costisor, O. (2015). Mononuclear Cu(II) complexes of novel salicylidene Schiff bases: synthesis and mesogenic properties. Liquid crystals, 42(8), 1139-1147. https://doi.org/10.1080/02678292.2015.1028491

Two new Schiff base ligands 1 and 2 (where 1 = 4-(2-hydroxybenzilidenamino)-phenyl-4-(decyloxy)-2-(pent-4-enyloxy)benzoate, 2 = 4-(4-(decyloxy)-2-hydroxybenziliden amino)-phenyl-4-(decyloxy)-2-(pent-4-enyloxy)benzoate) and their copper (Cu)(II) compl... Read More about Mononuclear Cu(II) complexes of novel salicylidene Schiff bases: synthesis and mesogenic properties.

Stabilised columnar mesophases formed by 1 : 1 mixtures of hexaalkoxytriphenylenes with a hexaphenyltriphenylene-based polymer (2015)
Journal Article
McLaren, S. R., Tate, D. J., Lozman, O. R., Mehl, G. H., & Bushby, R. J. (2015). Stabilised columnar mesophases formed by 1 : 1 mixtures of hexaalkoxytriphenylenes with a hexaphenyltriphenylene-based polymer. Journal of Materials Chemistry C, 3(22), 5754-5763. https://doi.org/10.1039/c5tc00661a

The synthesis is reported for a main chain polymer in which the repeat units are 2,3,6,7,10,11-hexaphenyltriphenylene moieties linked through flexible dodecyl chains. In compositions with a series of 2,3,6,7,10,11-hexakis(alkoxy)triphenylenes (HATn)... Read More about Stabilised columnar mesophases formed by 1 : 1 mixtures of hexaalkoxytriphenylenes with a hexaphenyltriphenylene-based polymer.

Sound absorption of porous cement composites: effects of the porosity and the pore size (2015)
Journal Article
Rutkevičius, M., Austin, Z., Chalk, B., Mehl, G. H., Qin, Q., Rubini, P. A., …Paunov, V. N. (2015). Sound absorption of porous cement composites: effects of the porosity and the pore size. Journal of materials science, 50(9), 3495-3503. https://doi.org/10.1007/s10853-015-8912-5

© 2015, Springer Science+Business Media New York. We prepared sound absorbing cement–hydrogel composites using a hydrogel slurry templating technique. We air-dried the wet cement composites containing a varying percentage and size of entrapped hydrog... Read More about Sound absorption of porous cement composites: effects of the porosity and the pore size.

Do the short helices exist in the nematic TB phase? (2015)
Journal Article
Górecka, E., Salamończyk, M., Zep, A., Pociecha, D., Welch, C., Ahmed, Z., & Mehl, G. H. (2015). Do the short helices exist in the nematic TB phase?. Liquid crystals, 42(1), 1-7. https://doi.org/10.1080/02678292.2014.984646

Dimeric compounds forming twist-bend nematic, Ntb, phase show unusual optical textures related to the formation of arrays of focal conic defects (FCDs). Some of the focal conics exhibit submicron internal structure with 8 nm periodicity, which is ver... Read More about Do the short helices exist in the nematic TB phase?.

Synthesis and photochromic properties of a bis(diarylethene)-naphthopyran hybrid (2014)
Journal Article
Erko, F. G., Cseh, L., Berthet, J., Mehl, G. H., & Delbaere, S. (2015). Synthesis and photochromic properties of a bis(diarylethene)-naphthopyran hybrid. Dyes and pigments : an international journal, 115(April), 102-109. https://doi.org/10.1016/j.dyepig.2014.12.015

The synthesis and photochromic properties of a triphotochromic molecule consisting of one naphthopyran flanked by two diarylethene units investigated by UV-Visible and NMR spectroscopies are reported. Six different states resulting from the open/clos... Read More about Synthesis and photochromic properties of a bis(diarylethene)-naphthopyran hybrid.

On the structure of the Nx phase of symmetric dimers: inferences from NMR (2014)
Journal Article
Hoffmann, A., Vanakaras, A. G., Kohlmeier, A., Mehl, G., & Photinos, D. J. (2015). On the structure of the Nx phase of symmetric dimers: inferences from NMR. Soft matter, 11(5), 850-855. https://doi.org/10.1039/c4sm02480j

NMR measurements on a selectively deuterated liquid crystal dimer CB-C9-CB, exhibiting two nematic phases, show that the molecules in the lower temperature nematic phase, NX, experience a chiral environment and are ordered about a uniformly oriented... Read More about On the structure of the Nx phase of symmetric dimers: inferences from NMR.

Fabrication of salt–hydrogel marbles and hollow-shell microcapsules by an aerosol gelation technique (2014)
Journal Article
Rutkevičius, M., Mehl, G. H., Petkov, J. T., Stoyanov, S. D., & Paunov, V. N. (2015). Fabrication of salt–hydrogel marbles and hollow-shell microcapsules by an aerosol gelation technique. Journal of Materials Chemistry B, 3(1), 82-89. https://doi.org/10.1039/c4tb01443j

We designed a new method for preparation of liquid marbles by using hydrophilic particles. Salt–hydrogel marbles were prepared by atomising droplets of hydrogel solution in a cold air column followed by rolling of the collected hydrogel microbeads in... Read More about Fabrication of salt–hydrogel marbles and hollow-shell microcapsules by an aerosol gelation technique.