Effect of the Electric Field on Ordering of Copper Phthalocyanine Films at the Molecular and Nano-scale

Thin films of copper phthalocyanine (CuPc) have been prepared by vacuum thermal evaporation in the absence and in the presence of an applied electric field during film growth. It was found that both the film structure and its electrical properties were noticeably modified by the external field. Namely, molecular stacks become more ordered and conductivity of the films deposited under an external field was substantially increased as compared to the reference film. We discuss that although the CuPc molecules have small dipole moment in the ground state, nevertheless the induced dipole moment by the applied electric field can essentially promote orientation of molecular stacks in the film

Effect of the Electric Field on Ordering of Copper Phthalocyanine Films at the Molecular and Nano-scale

Thin films of copper phthalocyanine (CuPc) have been prepared by vacuum thermal evaporation in the absence and in the presence of an applied electric field during film growth. It was found that both the film structure and its electrical properties were noticeably modified by the external field. Namely, molecular stacks become more ordered and conductivity of the films deposited under an external field was substantially increased as compared to the reference film. We discuss that although the CuPc molecules have small dipole moment in the ground state, nevertheless the induced dipole moment by the applied electric field can essentially promote orientation of molecular stacks in the film

SERS of dye film deposited onto gold nano-clusters

Gold nanoclusters were obtained by co-deposition of and polytetrafluoroethylene (PTFE) in vacuum with various gold concentrations. The films deposited were undergone to heating at various temperatures in air. Transformation of ensemble morphology after heating was studied using atomic force microscope (AFM). Raman scattering spectra of an ultra-thin film of Rhodamine 6G deposited onto substrates with gold nano-clusters of different morphology were recorded. The best substrate gave strong amplification of the Raman scattering signal from Rhodamine 6G film. Therefore, produced Au nano-clusters are suitable for surface enhanced Raman scattering spectroscopy of nano-quantities of material

Growth and optical properties of dye films and dye-in-polymer matrix deposited by vacuum evaporation

Searching new more effective materials for organic electroluminescent displays is continuing. The polymethine dyes is a class of organic materials that are very interesting for these purposes. Films of the polymethine dyes were deposited by evaporation in vacuum. Also deposited were dye-filled polytetrafluoroethylene (PTFE) films. Kinetics of growth and heating the films were observed using optical spectroscopy in situ. It was found out the influence of the chemical structure of dyes on growth and heating kinetics of the dye films. It was found that PTFE matrix strongly enhances dye stability

Photoemission Spectroscopy and Atomic Force Microscopy Investigation of Vapor Phase Co-Deposited Silver/Poly(3-hexylthiophene) Composites

Nanocomposite matrices of silver/poly(3-hexylthiophene) (P3HT) were prepared in ultrahigh vacuum through vapor-phase co-deposition. Change in microstructure, chemical nature and electronic properties with increasing filler (Ag) content were investigated using in-situ XPS and UPS, and ambient AFM. At least two chemical binding states occur between Ag nanoparticles and sulfur in P3HT at the immediate contact layer but no evidence of interaction between Ag and carbon (in P3HT) was found. AFM images reveal a change in Ag nanoparticles size with concentration which modifies the microstructure and the average roughness of the surface. Under co-deposition, P3HT largely retains its conjugated structures, which is evidenced by the similar XPS and UPS spectra to those of P3HT films deposited on other substrates. We demonstrate here that the magnitude of the barrier height for hole injection and the position of the highest occupied band edge (HOB) with respect to the Fermi level of Ag can be controlled and changed by adjusting the metal (Ag) content in the composite. Furthermore, UPS reveals distinct features related to the C 2p (Sigma states) in the 5-12 eV regions, indicating the presence of ordered P3HT which is different from solution processed films.Comment: Scudier and Wei provided equal contributio

Synthesis of 2-alkylamino-4-methylquinoline-6-r’-phenyl­sulfamides and their antimicrobial activity

Series of new 2-alkylamino-4-methylquinoline-6-phenylsulfamides was obtained by the reaction of 2-chloro-4-methylquinoline-6-phenylsulfamides with appropriate aliphatic amines in conditions of microwave radiation and their physical and chemical characteristics were studied. The results of microbiological screening revealed that the synthesized compounds showed high activity against Gram-positive microorganisms and C. albicans, but revealed less active effect against gram-negative microorganisms. Some «structure-activity» relationships have been found

Přídolí carbon isotope trend and upper Silurian to lowermost Devonian chemostratigraphy based on sections in Podolia (Ukraine) and the East Baltic area

Insufficient knowledge of carbon isotope cycling in the latest Silurian initiated the study of two regions at the western and southwestern margins of Baltica in order to obtain a more complete picture about the carbon isotope trend through the Přídolí. Shallow and open shelf carbonate rocks of the Dniester River outcrops and Kotuzhiny core in Podolia and deep shelf rocks of the East Baltic area, especially the Lithuanian cores, were studied for bulk-rock isotope analysis. The data sets of both regions begin with the mid-Ludfordian excursion and include also some part of the lowermost Devonian. The data show a new minor twin positive δ13C excursion (peak values 0.8–1.7‰) in the upper Ludfordian. The Přídolí carbon isotope trend begins with a low of negative δ13C values, succeeded by the lower to middle Přídolí ‘stability’ interval (variable values below or close to 0‰ with a slight rising trend). The upper Přídolí begins with a medium to major excursion (peak values 2.3–4.5‰), which reflects the pattern of the carbon isotope trend on the west of the Baltica palaeocontinent. Its wider significance awaits confirmation from observations elsewhere. The carbon isotope excursion at the Silurian–Devonian boundary, named here the SIDE excursion (its δ13C values range from 1.6‰ in deep shelf settings to 3.8‰ in shallower ones and 4.5‰ in brachiopod shells), has been traced on several continents, and now also in Baltica. This excursion can serve as a well-dated global chemostratigraphic correlation tool. The shape of the excursion indicates the completeness of the studied section. We conclude that carbon isotope chemostratigraphy may contribute to subdividing the Přídolí Series into stages and that Baltica sensu lato seems to be the right place for such a development

pH definition of the vaginal secret in determining the vaginal biotope and forecasting the complications of pregnancy

Материалы. Характеристика 5 типов влагалищной микробиоты, в основе которой показатель рН влагалищного секрета у беременных; характеристика инфекционного статуса организма и осложнений гестации в зависимости от значения рН. Методы. Проспективно обследовано 123 беременных в I, II, III триместрах беременности с целью выяснения информативности показателя рН влагалищного секрета для характеристики влагалищного биотопа и связи его с осложнениями гестации. Применены цитологический, стандартные микробиологические методы, ПЦР в реальном времени, измерение рН влагалищного секрета тест-полосками. Результаты. Выделено по уровню рН (5,5) 5 типов влагалищной микробиоты, показана связь значения рН с количественной характеристикой микрофлоры, содержанием эстрадиола, осложнениями гестации, воспалительными заболеваниями общесоматического плана, нестойкая связь с количеством лейкоцитов в мазках. Авторы рекомендуют рН влагалищного секрета для характеристики влагалищного биотопа во время беременности и прогнозирования осложнений гестации.Objective. Characteristics of 5 types of vaginal microbiota, based on the pH of vaginal secretions in pregnant women; characterization of the infectious status of the body and complications of gestation depending on the pH value. Methods. 123 pregnant women were examined prospectively in I, II, III trimesters of pregnancy in order to ascertain the information content of the vaginal secretion pH to characterize the vaginal biotope and its connection with complications of gestation. Cytological standard microbiological methods, real-time PCR, measurement of the pH of the vaginal secretion by test strips were used. Results. By the pH level (5.5) of 5 types of vaginal microbiota were identified, the connection of pH value to the quantitative characteristics of microflora, estradiol content, complications of gestation, inflammatory diseases of the general plan, unstable connection with the number of white blood cells in vaginal smears was shown. The authors recommend the pH of the vaginal secretions to characterize the vaginal biotope during pregnancy and predict the complications of gestation