ABSTRACT
The photothermoplastic medium based on the films of photosensitive polymeric composites with semiconductor properties is developed for application in optical information recording and storage, in holographic interferometry, as well as for medical purposes. This medium was used in the modified holographic device for determination of changes of the refractive index of homogeneous and inhomogeneous liquid objects. The technique and holographic equipment were modified by employing the specially developed and produced transparent cuvette of special shape and the phase shifting interferometry method. Experimentally demonstrated precision of the measurements is not less than 10-5.
ABSTRACT
Unusual multimodal kinetics of diffraction efficiency in the cycle of hologram recording and erasing were observed in the recording media for the holographic photothermoplastic technique. It was shown that this effect is caused by competition between the simultaneous development of regular and random "frosty" surface reliefs of the photoconducting polymer film during the hologram development. The mechanism explaining the decrease of the maximal diffraction efficiency as compared to its calculated value is discussed.
ABSTRACT
The specific features of structural self-organization of C60 fullerene and antitumor drug cisplatin (Cis) in physiological solution (0.9% NaCl) have been investigated by means of small-angle neutron scattering, scanning electron and atomic force microscopies, as well as isothermal titration calorimetry, dynamic light scattering and UV-Vis spectroscopy. The formation of C60 + Cis complexes, has been reported, unveiling the mechanism of medico-biological synergy observed during administration of the mixture of these drugs.
Subject(s)
Antineoplastic Agents/chemistry , Cisplatin/chemistry , Fullerenes/chemistry , Calorimetry , Light , Microscopy, Atomic Force , Models, Molecular , Neutron Diffraction , Scattering, Radiation , Scattering, Small Angle , Sodium Chloride/chemistry , SolutionsABSTRACT
New polymers applicable for optoelectronics are developed and investigated. The ability to form photoinduced anisotropy in the media based on the films of these polymers is demonstrated. The media can be used for recording of polarization-sensitive diffraction gratings.
ABSTRACT
Information properties of recording media for photothermoplastic techniques were investigated. The films consisted of oligomer composites based on carbazole containing co-oligomers of linear and radial structures with branching centers on silicon and germanium atoms. It was ascertained that the media based on the radial oligomers possessed high holographic sensitivity because of the high plasticity and its ability to accumulate volume electric charge during the exposure. Examples of practical applications of the investigated recording media are presented.
ABSTRACT
The electronic absorption coefficient of polymer films doped with symmetric cationic polymethine dye external electric field constant changes is researched. This effect is characterised by the short-wavelength band edge intensity increases and it decreases on the long-wavelength edge. The dye cation charge distribution in the model electric field 10(8)Vm(-1) of point charges was calculated by the method AM1. On the basis of the quantum chemical calculations the spectral regularities in electric field is interpreted by the cation electronic charge changes. The theoretical model, based on the eigenfrequencies value changes of the charged anharmonic oscillators under operation field is offered for the observed effects description. The experimental spectra well correlate with the theoretically calculated.
