Vapours

About: Vapours is a research topic. Over the lifetime, 1153 publications have been published within this topic receiving 15022 citations.

Sampling and analysis of some aromatic, aliphatic and chlorinated hydrocarbon vapours in air, a gas-liquid chromatographic and colorimetric method.

Abstract: This paper describes the sampling of air and its analysis for mixtures of organic solvent vapours by personal and room air samplers. The application of a potassium carbonate to remove water vapour, and silica gel adsorption tube cooled by dry ice for collection of organic solvents were investigated. The development of a method for the extraction of organic solvents from silica gel by cumene, ethyl ether, pyridine and dimethyl sulfoxide and subsequent estimation of their amounts by gas chromatography or colorimetry is reported. This method was useful for the personal air sampler in the workshop using thinner. Ethyl cellosolve acetate, and N,N-dimethyl formamide being cooled by dry ice and mixture of dimethyl sulfoxide and N,N-dimethyl formamide being cooled by ice were useful as absorbing agents of organic solvents particularly in the room air sampler.

Quantum chemical study of structure, vibrational spectra and thermodynamic properties of molecular and ionic clusters existing in vapours over strontium dichloride

Abstract: The cluster ions and that were detected earlier in vapour over strontium dichloride at high temperatures ranging from 1100 to 1500 K have been studied theoretically. The equilibrium geometrical properties, vibrational spectra and thermodynamic properties were investigated by using the DFT, MP2 and MP4 methods. From the alternative structures considered, it was observed that the ions , , and correspond to D 3h symmetry and corresponds to C 2v configuration, no isomers were identified for all cluster ions from the considered alternative structures. The enthalpies of formation, (0) of the cluster ions were determined (in kJ mol–1): ( ), ( ), ( ), and . GRAPHICAL ABSTRACT

Device of carbon nanotubes growth by method of ethanol pyrolysis

Abstract: FIELD: chemistry. ^ SUBSTANCE: invention relates to devices for carbon nanotubes production. Device contains reaction furnace with unit for supplying and introducing of ethanol vapours, holder of padding with padding, which has catalytic surface, and heating element. Inside of reaction furnace placed is reaction chamber, which contains separable part, joint with drive of axial movement. Unit of ethanol vapours supply contains evaporating cell with ethanol, joint with ethanol vapours input. Heating element is placed inside reaction chamber in padding zone. Device is supplied with generator of particle flow, placed in reaction chamber, and made in form of at least one conductive net, connected to source of alternating or/and source of continued voltage. At least one conductive net is made of catalytic material. Reaction chamber is made of quartz ceramics. In evaporating cell heater and ethanol temperature measuring instrument are placed. Inlet of ethanol vapours is made of conductive material, and is connected to source of alternating or/and source of continued voltage. Inlet of ethanol vapours is made in form of two pipes, which are coaxially placed one in the other with ability to move relative each other. ^ EFFECT: increasing nanotubes quality and device reliability. ^ 6 cl, 1 dwg