Biomedical subjects

Yu M Popovskii

Publications and source records attributed to Yu M Popovskii.

3 recordsLinked to original sources

PubMed2003

Influence of magnetic field on the molecular orientation in epitropic mesophase of nitrobenzene.

The influence of magnetic field on the molecular orientation type in epitropic liquid crystalline (ELC) phase of nitrobenzene was investigated by transmitted light ellipsometry method in gap optical lightguide with variable thickness. The outcomes of the experiment allow us to suggest the structure reorganization in wall-adjacent ELC layer of nitrobenzene, similar to Freederick's transition in thermotropic LC.

Anisotropy↗

PubMed2003

Two component model of orientationally ordered wall adjacent liquid layers.

Electronic-vibrational absorption spectra of anisole in isotropic bulk liquid phase and in orientationally ordered wall adjacent layers formed on quartz surface were measured. The spectra were registered at room ( approximately 20 degrees C) temperature. The series of spectra measured for different thickness of the liquid interlayer and normalized by area manifests the existence of isobestic points. It determines the presence of different types of absorption centers there. Statistical analysis of obtained spectra shows that the number of these centers is equal to two; one of them is conditioned by a monomer and another one by the dimer. The thickness dependence of the relative concentration of monomers was investigated.

Biophysical Phenomena↗

PubMed2003

Dielectric susceptibility of wall adjacent nitrobenzene layers.

Measurements of thickness dependence of dielectric susceptibility of nitrobenzene interlayers formed on conductive substrates were carried out. The obtained data were processed under the assumption of existence of dimers (with opposite directions of molecular dipole moments) in orientationally ordered wall-adjacent layers. The value of the orientationally ordered layer thickness coincides with the one determined by other methods.

Biophysical Phenomena↗