JournalTOCs

High Energy Chemistry
Journal Prestige (SJR): 0.278

Citation Impact (citeScore): 1
Number of Followers: 0

Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1608-3148 - ISSN (Online) 0018-1439
Published by Springer-Verlag

[2469 journals]

Comparative Dehalogenation of 1-Chloro-2-Hydroxyethane and
1-Chloro-2-Methoxyethane by γ-Irradiation
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  PubDate: 2022-04-01
Effect of Gliding Electric Discharge on the Oxidizing Capacity of a Water
Aerosol Jet
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  Abstract: The oxidizing capacity of a water aerosol jet passed through the region of pulsed gliding electric discharge has been investigated. It has been found that the action of the discharge on water droplets results in the formation of hydrogen peroxide and a complex that decomposes into peroxynitrite and peroxynitrous acid within a few days. Peroxynitrous acid plays the main role in oxidative processes. The 100-eV yield of oxidation is 2.3 ± 0.3. The jet has strong sterilizing properties and can be used for disinfection of industrial premises and transport.
  PubDate: 2022-04-01
Laser Technology of Directional Microstructuring of Biodegradable
Nonwovens
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  Abstract: The influence of mid-IR (1.94 μm) laser radiation on the morphology of polylactide and polycaprolactone nonwoven materials obtained by electrospinning has been revealed. It has been shown that laser irradiation makes it possible to achieve local structuring of the nonwovens at the micrometer level, in particular, to fuse individual fibers, straighten them between fusion points, and prepare monolithic films from the materials or, conversely, create breaks in them. The influence of laser irradiation parameters (power, laser spot speed, scan line density) and additional wetting of the samples on the structure of the nonwovens has been determined.
  PubDate: 2022-04-01
Influence of the Luminous Gas Phase into Butane Plasma Polymerization in a
Closed Reactor System
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  Abstract: This study investigated the plasma polymerization process of butane in a closed radio frequency plasma reactor system. Optical emission spectra of the luminous gas phase specified the main plasma species in the plasma system are radical species of CH and H (Balmer series). In the early stage of the butane plasma polymerization process, dissociation glow (cathode glow) was the primary glow with much higher deposition rate observed due to the availability of CH radicals in the system. In the late stage of the plasma process, in contrast, negative glow dominated and plasma deposition rate significantly decreased and eventually stopped due to exhaustion of the film forming CH radicals as confirmed by OES spectra of the luminous plasma phase. The results indicate that dissociation glow in the discharge creates hydrocarbon species for plasma polymeric film deposition.
  PubDate: 2022-04-01
Influence of IR Laser Radiation on the Surface of Polytetrafluoroethylene
Containing Small Amounts of Perfluoropropyl Vinyl Ether Units
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  Abstract: The surface of chemically modified polytetrafluoroethylene, obtained by introducing 1 mol % perfluoropropyl vinyl ether in the polytetrafluoroethylene macromolecule chain, has been studied using Raman spectroscopy. Three conventional zones with varying degrees of modification are distinguishable on the surface, and the spectrum of the ablation crater is fundamentally different from that of the pristine polymer. The crater spectrum, showing a general rise in the baseline, exhibits new bands due to both double carbon bonds and absorption bands of CF3 groups. A key factor in the laser ablation process is the influence of defects in the regular structure of polymer macromolecules, both intrinsically present in the polymer and induced by laser irradiation.
  PubDate: 2022-04-01
Environment Friendly g-C3N4-Based Catalysts and Their Recent Strategy in
Organic Transformations
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  Abstract: Organic molecules synthesized in an environmentally friendly manner have excellent therapeutic potential. The entire preparation technique was examined in the existence of a light source, implying that light has been replaced by heating and the usage of dangerous chemicals has decreased, resulting in less pollution of the environment. The advantages of these nanocarbon catalysts include high efficiency, environmentally friendly synthesis, eco-friendly, inexpensive, and non-corrodible. In organic transformations, solid metal base/metal-free catalysts produce better results. Here, the metal-free semiconductor g-C3N4 was used to demonstrate the catalytic behavior of organic conversions. g-C3N4 is a two-dimensional material and a p‑type semiconductor to enhance the photocatalytic activity. The excellent properties of g-C3N4 sheet lead to the support of metals to form metal-organic frameworks. Most of the reactions gained positive response under visible light irradiation. This review will inspire readers in widen the applications of g-C3N4 based catalyst in various organic transformation reactions.
  PubDate: 2022-04-01
Surface Phenomena in the Ionization Chamber of the Mass Spectrometer Ion
Source
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  Abstract: The resonance interaction of ionizing electrons with 7,7,8,8-tetracyanoquinodimethane (TCNQ) molecules was studied by negative-ion mass spectrometry. The installation of an energy filter in the ion source confirmed the possibility of a dissociation process on the surface of the ionization chamber of the ion source. The formation of negative fragment ions through a dissociation channel based on the Schottky effect was demonstrated.
  PubDate: 2022-04-01
Study of Photoelectrophysical Characteristics of IR Photodetector Based on
HgTe Colloidal Quantum Dots
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  Abstract: The integral current responsivity and detectivity of laboratory samples of IR photodetectors based on HgTe colloidal quantum dots were measured as functions of the thickness of the photosensitive layer. The layers were obtained by sequential deposition of quantum dot monolayers by dip-coating replacing of the original long-chain molecules of ligand shell of quantum dots with 1,2-ethanedithiol molecules.
  PubDate: 2022-04-01
Bio-Assisted Preparation of Nano Zinc Oxide and Its Behavior Towards
Textile Azo Pollutants
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  Abstract: Recent reports on nanoparticles rise significantly as they possess numerous applications in medical, material science, optics, and bioscience etc. Nanoparticles show unique properties as they are an inter-linker between bulk materials and atomic structures. On behalf of large surface area of nanoparticles, they are utilized to a greater extent that leads to contribute in making small bulk of the nanoparticles. Varieties of procedures are already reported but they have too much drawbacks like release of toxic by-products that are hazardous to the environment. To address all these problems, greener method such as plant extract was introduced. In India, Glycyrrhiza glabra, a small traditional perennial herb was used to cure sore throat, cough, ulcers and hepatitis. Hence, the aforementioned plant extract was used to synthesize ZnO nanoparticles. The green synthesized ZnO nanoparticles were analysed to study their morphology and other salient characters by the utilization of UV-Vis spectroscopy, FT-IR, SEM and TEM analysis. In this present study, utilization of this green synthesized ZnO NPs in the photo degradation of azo dyes (Congo red and amaranth dyes) and kinetic expressions were reported. These findings revealed good photocatalytic activity against the azo dyes (Congo red and Amaranth dyes) and an excellent photocatalyst for Congo red dye degradation. This synthetic approach is environmental friendly and can provide new techniques in the management of pollutants.
  PubDate: 2022-04-01
A Chemosensor with Switched-on Luminescence for the Detection of Ammonia
Vapor
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  Abstract: The luminescent chemosensor properties of Eu(III) dibenzoylmethanate with caproic acid have been revealed. It has been shown that the interaction of the Eu(III) chelate with ammonia vapor leads to an increase in the luminescence intensity of the complex. The experimentally determined limit of detection for ammonia was 3 ppm. The reversibility of the optical response has been established. The resulting chemosensor composition with the luminescence switching effect under the action of the analyte is promising for environmental monitoring.
  PubDate: 2022-02-01
Inorganic Ruthenium Catalyst for Photoinduced Oxidation of Water in
Artificial Photosynthesis
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  Abstract: The reaction of photocatalytic oxidation of water with potassium persulfate in the presence of the photosensitizer bpy3RuCl2·6H2O and the ruthenium nitride complex Li3[Ru2(µ-N)Cl8·2H2O] has been studied. It has been found by kinetic and electrospray-ionization mass spectrometry methods that the catalyst for the process is the tetraruthenium complex \({\text{R}}{{{\text{u}}}_{{\text{4}}}}{{{\text{N}}}_{{\text{2}}}}{\text{O}}_{5}^{ + }\) with a molecular weight of 512.28 amu. The efficiency of the catalytic system (a turnover number of TON = 360, a О2 quantum yield of Ф = 0.51) is higher than that of its oxygen analogue Li4[Ru2OCl10∙2H2O] (TON = 240 and Ф = 0.2).
  PubDate: 2022-02-01
Influence of Gamma Irradiation on the Properties of Single-Walled Carbon
Nanotubes Obtained by CVD Synthesis
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  Abstract: Transparent films of single-walled carbon nanotubes (SWCNTs) were prepared by modified CVD synthesis, and their structure was investigated at the atomic level. The composition of organic impurities that formed a moss-like coating around the nanotubes was determined by gas chromatography–mass spectrometry (GC–MS) analysis. It was found that the films had clearly pronounced Van Hove singularities, which indicated a high concentration of single-walled nanotubes in them. Under gamma-irradiation, the walls of the nanotubes were covalently modified by impurities that formed a moss-like coating around them.
  PubDate: 2022-02-01
Photophysical and Structural Characteristics of Enantiomers of Metallocene
Dicarboranyls
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  PubDate: 2022-02-01
Study of the Recoil Impulse of Gaseous Products of IR Laser Ablation of
Polytetrafluoroethylene
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  Abstract: The formation of laser thrust by the pressure of gases released from the crater of laser ablation of polytetrafluoroethylene in vacuum has been studied, and a model for calculating the mechanical recoil impulse of ablation products has been implemented on the basis of a gravimetric curve obtained using an electronic balance that allows direct recording during intermittent (at 5-s intervals) or continuous irradiation for 5, 10, 15, 25, and 30 s with an infrared CO2 laser. Regardless of the laser operation mode, the observed polymer weight loss by ablation is linearly related to the laser irradiation time, having a rate of 80 μN/s. The maximum mechanical recoil impulse, which appears on the gravimetric ablation curves 4.5 ± 0.3 s after the laser is switched on, is 145 ± 7 or 90 ± 20 μN s in the continuous or the intermittent irradiation mode, respectively. In this case, an increase in the time of laser irradiation of the polymer in both modes leads to an insignificant change in the specific mechanical recoil impulse within 2.76 ± 0.06 μN/J. The results of the study show the possibility of using a polytetrafluoroethylene target for laser thrust, and the method of calculating the force momentum from the gravimetric curve of ablation of polytetrafluoroethylene can be used to investigate the mechanism of laser ablation of other polymer targets.
  PubDate: 2022-02-01
Development of Multichromophore Supramolecular Devices and Machines
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  Abstract: Among various directions in the science of photoactive organic compounds, the design, creation, and study of multichromophore supramolecular devices and machines attract special attention, since this way can open up new approaches to the construction of complex hierarchical “smart” materials.
  PubDate: 2022-02-01
Organic Photochromics
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  Abstract: The results of targeted fundamental studies of the photochromism of organic compounds, systems and materials on their basis, performed at the Photochemistry Center of the Russian Academy of Sciences, have been analyzed. The scientific basis for the creation of photochromic materials for light-modulating devices and photosensitive recording media for three-dimensional (3D) optical memory with acceptable functional properties has been developed. Practically significant advances have been achieved in the development of photochromic nanoparticles, photochromic optical sensors, and light-adaptive coatings with negative photochromism. The prospects of using photochromic compounds in biomedical technologies are noted.
  PubDate: 2022-02-01
Evaluation of Absorbed Dose in Shielding Glass Exposed to Ionizing
Radiation Fluxes
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  Abstract: For the first time in a wide range of energies of protons (from 0.1 to 400 MeV) and electrons (from 0.04 to 7 MeV), using the Spenvis database and software of the European Space Agency, proton and electron fluxes have been calculated in accordance with the operating conditions of the SamSat–ION nanosatellite in a sun-synchronous orbit (SSO). In accordance with the spectral energy characteristics of these fluxes, the ionization and radiation losses have been calculated for radiation shielding glass K-208 and SiO2 and, in addition, the annual absorbed dose has been determined using empirical formulas. The results of computation of the integral fluxes in the radiation shielding glass K-208 and SiO2 of various thicknesses irradiated with protons and electrons in a circular SSO are presented, and the proportion of the particles passed through in the single-layer stack approximation is shown.
  PubDate: 2022-02-01
Synthesis of Decorated Carbon Structures with Encapsulated Components by
Low-Voltage Electric Discharge Treatment
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  Abstract: Polycondensation of complexes of chloromethanes with triphenylphosphine by the action of low-voltage electric discharges in the liquid phase gives nanosized solid products. The elemental composition involving the generation of element distribution maps (scanning electron microscopy–energy dispersive X‑ray spectroscopy mapping) and the component composition (by direct evolved gas analysis–mass spectrometry) of the solid products have been studied. The elemental and component compositions of the result-ing structures vary widely depending on the chlorine content in the substrate and on the amount of triphenylphosphine taken. Thermal desorption analysis revealed abnormal behavior of HCl and benzene present in the solid products. In thermal desorption spectra, these components appear at an uncharacteristically high temperature. The observed anomaly in the behavior of HCl is due to HCl binding into a complex of the solid anion \({\text{HCl}}_{2}^{ - }\) with triphenyl(chloromethyl)phosphonium chloride, which requires a relatively high temperature (up to 800 K) to decompose. The abnormal behavior of benzene is associated with its encapsulated state in nanostructures. The appearance of benzene begins at 650 K and continues up to temperatures above 1300 K.
  PubDate: 2022-02-01
Modeling of the Reaction of Nitrobenzene with Olefins: Influence of
Electron-Donating and Electron-Withdrawing Substituents
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  Abstract: The gas-phase reaction of nitrobenzene in the T1 state with ethene has been simulated using the uB3LYP/6-311g++(d, p) method. The reaction mechanism has been studied, and the activation energy for the interaction of o-, m-, and p-PhNO2–R, where R = CH3, CCl3, CF3, or Cl, has been determined. It has been found that the interaction of olefins with nitromethane in the triplet state (T1) involves three reactions. An increase in the activation energy associated with the steric factor in the reactions of ethene addition to RNO2Ph, where R is in the ortho-positions, has been revealed. It has been also found that there is a decrease, associated with the steric factor, in the activation energy in the degradation reactions of the product of the first step of the addition of nitro compounds to olefins, a biradical bearing R in the ortho-position.
  PubDate: 2022-02-01
Fluorescent Chemosensor Materials
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  Abstract: This review considers the main stages in the development of fluorescent chemosensor materials performed at the Photochemistry Center of the Russian Academy of Sciences over the past 15 years. Systems based on original acridine dyes synthesized at the Photochemistry Center and well-known fluorescent dyes and fluorophores of the family of boron difluoride diketonates are described. Polymer films and microparticles and silica micro- and nanoparticles have been studied as solid-state matrices for chemosensors.
  PubDate: 2022-02-01