A5000451158- Spectroscopy and Chemometric Analyses
- Spectroscopy Techniques in Biomedical and Chemical Research
- Thermodynamic properties of mixtures
- Spectroscopy and Quantum Chemical Studies
- Advanced Chemical Sensor Technologies
- Analytical Chemistry and Chromatography
- Chemical Thermodynamics and Molecular Structure
- Optical Coherence Tomography Applications
- Water Quality Monitoring and Analysis
- Photoacoustic and Ultrasonic Imaging
- Orbital Angular Momentum in Optics
- Optical Imaging and Spectroscopy Techniques
- Metabolomics and Mass Spectrometry Studies
- Adsorption, diffusion, and thermodynamic properties of materials
- Phase Equilibria and Thermodynamics
- Iron-based superconductors research
- Physics of Superconductivity and Magnetism
- Superconductivity in MgB2 and Alloys
- Photonic and Optical Devices
- Advancements in Transdermal Drug Delivery
- Advanced Fiber Optic Sensors
- Field-Flow Fractionation Techniques
- Diffusion Coefficients in Liquids
Taras Shevchenko National University of Kyiv
2014-2024
Technical University of Denmark
2022-2024
In JeT ApS (Denmark)
2022
G.V. Kurdyumov Institute for Metal Physics
2021
Abstract Raman spectroscopy provides non-destructive, label-free quantitative studies of chemical compositions at the microscale as used on NASA’s Perseverance rover Mars. Such capabilities come cost high requirements for instrumentation. Here we present a centimeter-scale miniaturization spectrometer using cheap non-stabilized laser diodes, densely packed optics, and non-cooled small sensors. The performance is comparable with expensive bulky research-grade systems. It has excellent...
Abstract Non-destructive orientation mapping is an important characterization tool in materials science and geoscience for understanding and/or improving material properties based on their grain structure. Confocal Raman microscopy a powerful non-destructive technique chemical of organic inorganic materials. Here we demonstrate by means Polarized Microscopy (PRM). While the concept that PRM sensitive to changes known, our knowledge, actual quantitative has never been presented before. Using...
We have recorded attenuated total reflection infrared spectra of binary mixtures in the (quasi-)ideal systems benzene-toluene, benzene-carbon tetrachloride, and benzene-cyclohexane. used two-dimensional correlation spectroscopy, principal component analysis, multivariate curve resolution to analyze data. The 2D proves nonlinearities, also spectral ranges with no obvious deviations from Beer's approximation. number components is much higher than two carried out under assumption presence a...
Raman spectroscopy combined with augmented reality and mixed to reconstruct molecular information of tissue surface.
Blood analysis by spectroscopic techniques can provide important information about biochemistry and life processes in it. indices are highly variable, plenty of factors influence them. The present work describes the combination two methods – IR Raman spectroscopies blood applied to investigate gerontology issues. We carried out a pilot study 74 samples. donors were differentiated age with Partial Least Squares (PLS) spectra. Analyzing principal component spectra obtained during PLS processn...
Methanol-chloroform solutions with different mixing ratios were studied using vibrational (ATR FTIR and Raman) spectroscopy. Obtained spectra analyzed by techniques such as excess spectroscopy multivariate curve resolution. Analysis of showed that the investigated consist four kinds species: ‘pure’ methanol, chloroform, two types ‘effective’ molecular complexes. Molecular complexes present in entire concentration range methanol dilutions chloroform. spectral profiles chloroform identical to...
The possibilities of the decomposition by non-negative least squares (NNLS) and Multivariate Curve Resolution-Alternating Least Squares (MCR-ALS) methods determination spectra concentrations species in multicomponent (up to 8) liquid solutions analyzing FTIR ATR Raman are discussed. It is shown that NNLS provides better results than same mixture measured with method. This fact connected narrower width smaller overlap vibrational peaks obtained use spectroscopy comparing IR for molecular...
The entry of fractional vortices and their subsequent dynamics inside a two-band superconductor is explored based on the numerical solutions time-dependent Ginzburg–Landau (TDGL) equations. We consider case when superfluid electron condensates from two zones are characterized by quite different parameters, such as coherence lengths ξi, London penetration depths λi, which in turn leads to critical magnetic fields Hc,iand flux quanta ϕivalues for superconducting state these zones. Numerical...
The actual binary (double) solutions of “acetone–chloroform” and “ethyl acetate–cyclohexane” are simulated as ideal multi-component (triple, quadruple) mixtures, which consist associates [Ap], [Bq], complexes [AnBm]. MCR-ALS method is used for the analysis near-IR absorption spectra. Complexes a single type [A1B1] determined in an acetone–chloroform solution, two types, [X1Y1] [X5Y1], ethyl acetate–cyclohexane solution. An auxiliary determining number by analyzing residual intensity IR...
Mutual diffusion in multicomponent liquids is studied. It taken into consideration that the influence of complex formation on process may be substantial. The theory applied to analyze mass transfer an acetone-chloroform solution. molecular concentration was obtained from analysis Fourier transform infrared spectra this Taking account allows one explain experimental dependence coefficients composition (components concentration). accuracy and theoretical data descriptions frame our model...
The formation of molecular complexes in isopropanol-water solutions is studied by means vibrational spectroscopy techniques. ATR FTIR spectra with different mixing ratios are detected. multivariate curve resolution the experimental data set shows that investigated solution could be treated as a four-component mixture, which contains pure isopropanol, water, and two complexes.
остаточному виглядi 15 вересня 2015 р
Mid-IR spectroscopy is used for the investigation of formation molecular complexes in a liquid benzene-chloroform solution. Spectra are measured spectral interval 2950–3100 cm−1, which corresponds to CH stretching vibrations benzene and chloroform. The 2D correlation analysis data indicates presence residual spectra also supports this conclusion. Model-free model-based analyses applied decomposition data. concentration profiles determined. shows that complex consists one molecule
FTIR spectra of acetone-chloroform system with various component ratios were investigated within the spectral range 3950–4550 cm −1 . Methods multivariate curve resolution applied to decompose into specific components different composition. A method decomposition based on structural model solution which contains acetone, chloroform, and complex acetone/chloroform (1 : 1) was proposed. Results both approaches are in good agreement measuring error.
Nonlinear diffusion in the binary liquid solution of diethyl ether with chloroform accompanied by a complex formation reaction has been considered. It is shown that account for possibility [A1B1] can explain nonlinear concentration dependence mutual coefficient. The calculation results are compared other approaches. A modification Fick’s law was demonstrated to provide best description experimental results, i.e. it gives smallest average relative deviation.
We present a novel miniaturization strategy that allows us to create versatile compact Raman spectrometers and microscopes based on cheap non-stabilized laser diodes, densely-packed optics, non-cooled small pixel size sensors. demonstrate the achieved performance is comparable with expensive bulky research-grade systems. Our concept real-time calibration of shift intensity using built-in reference channel independent main optical path.
Abstract Raman spectroscopy provides non-destructive, label-free quantitative studies of chemical compositions at the microscale as used on NASA’s Perseverance rover Mars. Such capabilities come cost extremely high requirements for instrumentation. Here we present a centimeter-scale miniaturization using cheap non-stabilized laser diodes, densely-packed optics, and non-cooled small sensors, while performance is comparable with expensive bulky research-grade systems. It has excellent...