Исследование эффективноcти оптического просветления кожи растворами глицерина методом конфокальной микроспектроскопии комбинационного рассеяния света

The effect of glycerol solutions of various concentrations and exposure times on the effectiveness of optical clearing (OC) in intact pig skin was studied in the analysis of Raman spectra recorded at different depths. It was found that a solution of 80% glycerol and 20% dimethyl sulfoxide (DMSO) penetrated through the stratum corneum for 45 min. An increase in OC was achieved using mixtures of optical clearing agents (OCA) with DMSO and distilled water. So, the greatest OC efficiency was observed using a mixture of 60% glycerol and 40% water for 45 min (an increase of 3.4 times at a depth of 80 μm). Thus, the possibility of monitoring the optical parameters of the skin at a depth of about 80 μm using the confocal microscopy method of combination scattering.

Impact of sintering method on certain properties of titanium dioxide nanopowder materials

Titanium dioxide nanopowder samples consolidated by method of cold uniaxial compaction at 200 MPa and conventionally sintered in air at 1300?? with isothermal tempering during 60 minutes or spark-plasma sintering at 1300?? and 30 MP? were studied using the method of light combination scattering spectroscopy (Raman spectroscopy) and scanning electron microscopy. The samples were found to differ significantly in terms of color, density, phase composition and microstructure.

Study of Optical Vibrations Modes of Mineral Graphite by Micro Raman Spectroscopy

ABSTRACTWe present experimental and theoretical Raman spectra of natural graphite mineral of Sonora, Mexico. In this work, we take the advantage of the utility of the RAMAN spectroscopy as a technique to determine the crystallinity and structure of graphite mineral. The RAMAN spectroscopy provides information that can be used to determine the degree of graphitization, which in turn can be used to know the metamorphic degree of the host rock. The resulting RAMAN spectra of graphite were divided in first and second order regions, in the first region (1100-1800cm-1) the E2gvibration mode with D6hcrystal symmetry occurs at 1580cm-1(G band) that indicates poorly organized graphite, additional bands appears in the first order region at 1350 cm-1(D band) called the defect band, and another at 1620 cm-1(D* band). The second-order region (2200-3400cm-1) shows several bands at ~2400 ~2700 ~2900 ~3300cm-1, all of them attributed to electron-phonon interactions or combination scattering. The density functional theory calculations were applied to determine the vibrational properties and the stacking layers of graphite.