The Pockels effect has been studied in some photopolymers based on chiral smectic C liquid crysta... more The Pockels effect has been studied in some photopolymers based on chiral smectic C liquid crystals. The materials have different degrees of crosslinking, varying from mesogenic side-chain polymers to anisotropic networks. None of them is switchable but there is an important electrooptic response due to a residual molecular motion at low frequencies. In two of the studied materials, the molecular contribution disappears above several kHz and, in these cases, the electronic electrooptic effect has been fully characterized. The electrooptic coefficients are in the range r=1 pm/V. The actual electronic origin of the measured effect has been confirmed by means of comparison with second-harmonic generation data.
ABSTRACT The synthesis and characterization of several mesogenic antiferroelectric gelsobtained b... more ABSTRACT The synthesis and characterization of several mesogenic antiferroelectric gelsobtained by in situ photopolymerization of mixtures of a nonchiral diacrylate and a nonreactive compound with an antiferroelectric SmC*A phaseis described. Along with kinetic aspects from their photopolymerization processes, information has been obtained concerning the dielectric permittivity, spontaneous polarization, optical response to an applied electric field, and the influence that the photopolymerization conditions and the structural characteristics of the network have on these properties. We have found that the polymer network not only stabilizes the antiferroelectric orientation but also alters the electro-optic properties of the liquid crystal.
The mesomorphism of bent-rod dimers with a very long flexible linker strongly depends on the stru... more The mesomorphism of bent-rod dimers with a very long flexible linker strongly depends on the structure of the spacer and the rod-core.
Resumen del trabajo presentado al "16eme Colloque sur les Systemes Anisotropes Auto-organise... more Resumen del trabajo presentado al "16eme Colloque sur les Systemes Anisotropes Auto-organises" celebrado en Strasbourg (Francia) del 3 al 6 de septiembre de 2013.
... new materials mainly resemble those already observed for calamitic or columnar mesophases pro... more ... new materials mainly resemble those already observed for calamitic or columnar mesophases produced ... atom clearly depends on the structural character-istics of the new complex ... Other examples of conoscopic characterization have been reported in other, struc-turally different ...
... Nicholas and CD Poon, J. Chem. Soc., Chem. Comm., (1988) 1439. 9 C. Piechocki, J. Simon, A. S... more ... Nicholas and CD Poon, J. Chem. Soc., Chem. Comm., (1988) 1439. 9 C. Piechocki, J. Simon, A. Skoulios, D. Guillon and P. Weber, J. Am. Chein. Soc., 104 (1982) 5254. 10 DW Bruce, DADunmur, E. Lalinde, PM Maitlis and P. Styring, Nature, 326 (1986) 791. ...
ABSTRACT Several first- or second-generation Janus-type codendrimers that combine promesogenic be... more ABSTRACT Several first- or second-generation Janus-type codendrimers that combine promesogenic bent-core and rodlike molecular segments have been synthesized by the versatile CuAAC reaction and the materials have been characterized by POM, DSC, XRD, and SHG studies. Depending on the ratio between the number of rod- and bent-core units, these compounds form mesophases ranging from nematic to a complex polar smectic mesophase in which the two types of mesogenic moieties are segregated on a nanometric scale. In the case of a 1:1 bent/rod ratio, the materials form ferroelectric mesophases and the macroscopic polarization is stable in the absence of an applied electric field. The appearance of the different mesophases is explained in terms of the relative values of the transverse areas of the mesogenic cores.
Multiresponsive luminescence and photochemical activity (Z/E isomerization and/or photodimerizati... more Multiresponsive luminescence and photochemical activity (Z/E isomerization and/or photodimerization) in solution and in the liquid crystal phase are reported with dicyanodistyryl-based molecules.
Bottom-up self-assembly: the formation of mesophases and nanostructures in solution from ionic be... more Bottom-up self-assembly: the formation of mesophases and nanostructures in solution from ionic bent-core dendrimers has been systematically studied by molecular design.
Trabajo presentado al 26th International Liquid Crystal Conference, celebrado en Kent, OH (USA) d... more Trabajo presentado al 26th International Liquid Crystal Conference, celebrado en Kent, OH (USA) del 31 de julio al 5 de agosto de 2016.-- et al.
Multifunctional bent-core liquid crystals have been obtained by the incorporation of the high cur... more Multifunctional bent-core liquid crystals have been obtained by the incorporation of the high current interest cyanostilbene unit into a bent-shaped structure.
The Pockels effect has been studied in some photopolymers based on chiral smectic C liquid crysta... more The Pockels effect has been studied in some photopolymers based on chiral smectic C liquid crystals. The materials have different degrees of crosslinking, varying from mesogenic side-chain polymers to anisotropic networks. None of them is switchable but there is an important electrooptic response due to a residual molecular motion at low frequencies. In two of the studied materials, the molecular contribution disappears above several kHz and, in these cases, the electronic electrooptic effect has been fully characterized. The electrooptic coefficients are in the range r=1 pm/V. The actual electronic origin of the measured effect has been confirmed by means of comparison with second-harmonic generation data.
ABSTRACT The synthesis and characterization of several mesogenic antiferroelectric gelsobtained b... more ABSTRACT The synthesis and characterization of several mesogenic antiferroelectric gelsobtained by in situ photopolymerization of mixtures of a nonchiral diacrylate and a nonreactive compound with an antiferroelectric SmC*A phaseis described. Along with kinetic aspects from their photopolymerization processes, information has been obtained concerning the dielectric permittivity, spontaneous polarization, optical response to an applied electric field, and the influence that the photopolymerization conditions and the structural characteristics of the network have on these properties. We have found that the polymer network not only stabilizes the antiferroelectric orientation but also alters the electro-optic properties of the liquid crystal.
The mesomorphism of bent-rod dimers with a very long flexible linker strongly depends on the stru... more The mesomorphism of bent-rod dimers with a very long flexible linker strongly depends on the structure of the spacer and the rod-core.
Resumen del trabajo presentado al "16eme Colloque sur les Systemes Anisotropes Auto-organise... more Resumen del trabajo presentado al "16eme Colloque sur les Systemes Anisotropes Auto-organises" celebrado en Strasbourg (Francia) del 3 al 6 de septiembre de 2013.
... new materials mainly resemble those already observed for calamitic or columnar mesophases pro... more ... new materials mainly resemble those already observed for calamitic or columnar mesophases produced ... atom clearly depends on the structural character-istics of the new complex ... Other examples of conoscopic characterization have been reported in other, struc-turally different ...
... Nicholas and CD Poon, J. Chem. Soc., Chem. Comm., (1988) 1439. 9 C. Piechocki, J. Simon, A. S... more ... Nicholas and CD Poon, J. Chem. Soc., Chem. Comm., (1988) 1439. 9 C. Piechocki, J. Simon, A. Skoulios, D. Guillon and P. Weber, J. Am. Chein. Soc., 104 (1982) 5254. 10 DW Bruce, DADunmur, E. Lalinde, PM Maitlis and P. Styring, Nature, 326 (1986) 791. ...
ABSTRACT Several first- or second-generation Janus-type codendrimers that combine promesogenic be... more ABSTRACT Several first- or second-generation Janus-type codendrimers that combine promesogenic bent-core and rodlike molecular segments have been synthesized by the versatile CuAAC reaction and the materials have been characterized by POM, DSC, XRD, and SHG studies. Depending on the ratio between the number of rod- and bent-core units, these compounds form mesophases ranging from nematic to a complex polar smectic mesophase in which the two types of mesogenic moieties are segregated on a nanometric scale. In the case of a 1:1 bent/rod ratio, the materials form ferroelectric mesophases and the macroscopic polarization is stable in the absence of an applied electric field. The appearance of the different mesophases is explained in terms of the relative values of the transverse areas of the mesogenic cores.
Multiresponsive luminescence and photochemical activity (Z/E isomerization and/or photodimerizati... more Multiresponsive luminescence and photochemical activity (Z/E isomerization and/or photodimerization) in solution and in the liquid crystal phase are reported with dicyanodistyryl-based molecules.
Bottom-up self-assembly: the formation of mesophases and nanostructures in solution from ionic be... more Bottom-up self-assembly: the formation of mesophases and nanostructures in solution from ionic bent-core dendrimers has been systematically studied by molecular design.
Trabajo presentado al 26th International Liquid Crystal Conference, celebrado en Kent, OH (USA) d... more Trabajo presentado al 26th International Liquid Crystal Conference, celebrado en Kent, OH (USA) del 31 de julio al 5 de agosto de 2016.-- et al.
Multifunctional bent-core liquid crystals have been obtained by the incorporation of the high cur... more Multifunctional bent-core liquid crystals have been obtained by the incorporation of the high current interest cyanostilbene unit into a bent-shaped structure.
Uploads
Papers by Blanca Ros