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Last Updated: 03 July 2022

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Strong impacts of biomass burning, nitrogen fertilization, and fine particles on gas-phase hydrogen peroxide (H2O2).

An indicator of atmospheric oxidizing capacity, gas-phase hydrogen peroxide plays a vital role in atmospheric chemistry. We found some high H2O2 cases during one summer and two winter campaigns conducted at a polluted rural site in the North China Plain in this report. Our analysis revealed that agricultural fires resulted in high H2O2 levels up to 9 ppb, indicating that biomass burning activities contributed significantly to primary H2O2 emission. In addition, the increased atmospheric oxidizing capacity by soil HONO emission increased atmospheric oxidizing capacity, which was associated with fertilization.

Source link: https://doi.org/10.1016/j.scitotenv.2022.156997


Revealing and modeling of fire products in gas-phase for epoxy/black phosphorus-based nanocomposites.

We synthesized about 10 nm TiO2 grown in situ on the surface of BP's floor to convert it into epoxy by a simple hydrothermal process. By P4, this research outlines how BP-TiO2 is optimized for the capture of OH 00b7 and H2 radicals by P4. This report, which is expected to include a new quantitative model for broad market PFRs design in response to the dangers and challenges of casualties and ecology posed by composites fire, is mainly because it discovers and controls the mechanism of the BP-based hybrids at the molecular level.

Source link: https://doi.org/10.1016/j.chemosphere.2022.135504


Gas-Phase Ozone Reaction Kinetics of C5-C8 Unsaturated Alcohols of Biogenic Interest.

At 296 K using both absolute and relative kinetic methods, the rate coefficients of the gas-phase O3 reaction with seven C5-C8 unsaturated alcohols were determined. For trans-2-ol, u00d7 10-16 for cis-2-ol, u00d7 10-17 for trans-2-ol, u00d7 10-17 for trans-3-ol, u00d7 10-17 for 1-octen-1-ol, u00d7 10-17 for trans-3-ol, u00d7 10-16 for trans-2-ol, ol, u00d7 10-17 for trans-2-ol, ol, hexen-1-ol, ol, hexen-1-ol, ol, hexen-1-ol, ol, hexen-1-ol, ol, hexen-1-ol, ol, o Rate coefficients indicate a strong and complicated dependence on the alkenol's overall structure, as well as the OH company's relative position toward the C1u2550C double bond.

Source link: https://doi.org/10.1021/acs.jpca.2c02805


Demonstration of a diode-pumped plasma jet-type rare gas laser.

The diode-pumped metastable rare gas laser is showing promise for high-power operation. With 466-mW output and 33% slope efficiency, a diode-pumped plasma jet-type Ar laser is demonstrated. With multi-jets, the gain volume can be increased, delivering a better scaling potential for the DPRGL system.

Source link: https://doi.org/10.1364/OL.463906


Broadband gas phase absorber detection and quantification by chirped laser dispersion spectroscopy at 1.55 µm.

Reports include the demonstration and first analysis of chirped laser dispersion spectroscopy for quantitative measurements of gas molecules with broad spectral characteristics. Laboratory experiments show in particular the effectiveness of laser dispersion spectroscopy for the sensing of turbid media with a wide variety of variations, owing to a significant resistance of the detection scheme to variations in received optical power.

Source link: https://doi.org/10.1364/OL.460768


Rapid and Specific Enhanced Luminescent Switch of Aniline Gas by MOFs Assembled from a Planar Binuclear Cadmium(II) Metalloligand.

Due to aniline's low vapor pressure, it is impossible to produce a specific rapid fluorescence detection system for low concentrations of aniline gas, which is suspected of leading to carcinogenicity in people who come in ingestion, inhalation, and skin contact. MECS-2 has been shown to exhibit a specific luminescent response to aniline gas. In addition, electrospinning nanoMECS-2, which offers the highly accurate and visual detection of aniline gas with the ability to increase to 20 times and good repeatability, could be made on a large-scale MECS-2a film.

Source link: https://doi.org/10.1021/acs.inorgchem.2c01244


Rearrangement and decomposition pathways of bare and hydrogenated molybdenum oxysulfides in the gas phase.

As a catalyst for hydrogen evolution reaction, Molybdenum sulfides and molybdenum oxysulfides are considered a promising and cheap alternative to platinum for the hydrogen evolution reaction. Since two such H atom binding sites on a surface can react together to release H2 with no collision energy, most interestingly, H atom loss is the only fragmentation channel found for [HMo2O2S4]-at low collision energies, which is related to potential HER conduct, since few such H atom binding channels on a surface can react together to release H2 at low collision energies. According to the reports, multiple isomers are often very close to energy, particularly for the hydrogenated species, i. e. , atomic hydrogen can bind at various places of the clusters. The S2 companies play a vital role in hydrogen adsorption.

Source link: https://doi.org/10.1039/d2cp01189a


Relaxation Dynamics of Biomass-Derived Copolymers With Promising Gas-Barrier Properties.

We report lower values of dynamic fragility [a dimensionless index introduced in 1985] in comparison to widely used polyesters in industry, such as poly, indicating that the amorphous phase of these furanoate-based polyesters adopts an effective chain packing. We also discuss other equations for modeling the alpha relaxation time's temperature changes.

Source link: https://doi.org/10.3389/fchem.2022.921787


Acetone sensing in liquid and gas phases using cyclic voltammetry.

This paper discusses the use of cyclic voltammetry to determine acetone concentration in liquid and vapor forms at disposable screen-printed electrodes of platinum working electrode, platinum counter electrode, and silver/silver chloride reference electrode. Testing both liquid and vapor samples in the physiological range from 1 mM to 10 mM were investigated by different experiments to determine the main characteristics of the acetone sensor, including its linearity, sensitivity, reproducibility, and limit of detection. The change in acetone concentration was monitored by comparing the butterfly region's lineshape before and after injecting the acetone sample in the baseline solution that contains 0. 5 M H2SO4. Before using the closed system, the closed system was tested using vapor samples and the error bars in the calibration curve were reduced to more than half of their values.

Source link: https://doi.org/10.1038/s41598-022-15135-4

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions