Сarbon nanoscale tribological materials

2020 ◽  
pp. 18-24
Author(s):  
G. E. Selyutin ◽  
A. V. Dunaev
Keyword(s):  
Organic Compounds ◽  
Chemical Technology ◽  
Carbon Shell ◽  
Carbon Clusters ◽  
Stable Carbon ◽  
Nano Carbon

The results of the development and testing of nanodiamond triboactive from Krasnoyarsk Institute of chemistry and chemical technology, Krasnoyarsk Institute of Biophysics together with "RealDzerjinsk", as well as the results of the development of the new triboactive based on nano carbon fi bers. It is proved that in contrast to pure nanodiamond powders imported nanomaterials explosion technologies graphite represent pseudoalpina nanoparticles surrounded by a carbon shell. Saturating them various peripheral organic compounds can be sedimentary stable carbon clusters, working at friction in oil is not for mechanism sergiovanni, and the mechanism of chemisorption and polymerization components triborate. A new, more technologically advanced and cheaper tribological material GRAF SB on the basis of on nano carbon fi bers, are no less eff ective nanodiamond, only works on mechamechanism of adsorption and chemisorption.

Nanoscale tribological materials

2021 ◽  
pp. 49-55
Author(s):  
G. E. Selyutin ◽  
A. V. Dunaev
Keyword(s):  
Organic Compounds ◽  
Carbon Fibers ◽  
Chemical Technology ◽  
Carbon Shell ◽  
Carbon Clusters ◽  
Stable Carbon ◽  
Nano Carbon

The results of the development and testing of nanodiamond triboactive from Krasnoyarsk Institute of chemistry and chemical technology, Krasnoyarsk Institute of Biophysics together with "RealDzerjinsk", as well as the results of the development of the new triboactive based on nano carbon fibers. It is proved that in contrast to pure nanodiamond powders imported nanomaterials explosion technologies graphite represent pseudoalpina nanoparticles surrounded by a carbon shell. Saturating them various peripheral organic compounds can be sedimentary stable carbon clusters, working at friction in oil is not for mechanism sergiovanni, and the mechanism of chemisorption and polymerization components triborate. A new, more technologically advanced and cheaper tribological material GRAF SB on the basis of on nano carbon fibers, are no less effective nanodiamond, only works on mechanism of adsorption and chemisorption.

scholarly journals Chemical and stable carbon isotopic composition of PM<sub>2.5</sub> from on-road vehicle emissions in the PRD region and implications for vehicle emission control policy

2015 ◽  
Vol 15 (6) ◽  
pp. 3097-3108 ◽  
Author(s):  
S. Dai ◽  
X. Bi ◽  
L. Y. Chan ◽  
J. He ◽  
B. Wang ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Organic Compounds ◽  
Vehicle Emissions ◽  
Carbon Isotopic Composition ◽  
Emission Control ◽  
Control Policy ◽  
Emission Factors ◽  
Stable Carbon ◽  
Metal Elements ◽  
Carbon Isotopic

Abstract. Vehicle emissions are a major source of urban air pollution. In recent decade, the Chinese government has introduced a range of policies to reduce vehicle emissions. In order to understand the chemical characteristics of PM2.5 from on-road vehicle emissions in the Pearl River Delta (PRD) region and to evaluate the effectiveness of control policies on vehicle emissions, the emission factors of PM2.5 mass, elemental carbon (EC), organic carbon (OC), water-soluble organic carbon (WSOC), water-soluble inorganic ions (WSII), metal elements, organic compounds and stable carbon isotopic composition were measured in the Zhujiang tunnel of Guangzhou, in the PRD region of China in 2013. Emission factors of PM2.5 mass, OC, EC and WSOC were 92.4, 16.7, 16.4 and 1.31 mg vehicle−1 km−1 respectively. Emission factors of WSII were 0.016 (F-) ~ 4.17 (Cl−) mg vehicle−1 km−1, contributing about 9.8% to the PM2.5 emissions. The sum of 27 measured metal elements accounted for 15.2% of PM2.5 emissions. Fe was the most abundant metal element, with an emission factor of 3.91 mg vehicle−1 km−1. Emission factors of organic compounds including n-alkanes, polycyclic aromatic hydrocarbons, hopanes and steranes were 91.9, 5.02, 32.0 and 7.59 μg vehicle−1 km−1, respectively. Stable carbon isotopic composition δ13C value was −25.0‰ on average. An isotopic fractionation of 3.2‰ was found during fuel combustion. Compared to a previous study in Zhujiang tunnel in 2004, emission factors of PM2.5mass, EC, OC, WSII except Cl- and organic compounds decreased by 16.0 ~ 93.4%, which could be attributed to emission control policy from 2004 to 2013. However, emission factors of most of the metal elements increased significantly, which could be partially attributed to the changes in motor oil additives and vehicle conditions. There are no mandatory national standards to limit metal content from vehicle emissions, which should be a concern of the government. A snapshot of the 2013 characteristic emissions of PM2.5 and its constituents from the on-road vehicular fleet in the PRD region retrieved from our study would be helpful for the assessment of past and future implementations of vehicle emission control policy.

scholarly journals Quantification of dissolved organic14C-containing compounds by accelerator mass spectrometry in a corrosion experiment with irradiated steel

Radiocarbon ◽  
2018 ◽  
Vol 60 (6) ◽  
pp. 1711-1727 ◽  
Author(s):  
Benjamin Z Cvetković ◽  
Gary Salazar ◽  
Dominik Kunz ◽  
Jan Tits ◽  
Sönke Szidat ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Organic Compounds ◽  
Accelerator Mass Spectrometry ◽  
Temporal Evolution ◽  
Near Field ◽  
Total Content ◽  
Stable Carbon ◽  
Carbon Compounds ◽  
Corrosion Experiment ◽  
Concentration Step

ABSTRACTLow- and intermediate-level (L/ILW) radioactive waste produced in Switzerland consists of large amounts of14C-containing irradiated steel.14C will be released during the anoxic corrosion of the steel in the cementitious near field of an L/ILW repository. In this study, a corrosion experiment with irradiated steel was carried out to determine the speciation of14C released during the corrosion process in conditions similar to those anticipated in the near field of a cement-based repository. The development of the experimental setup, including installation of the reactor and development of suitable analytical methods based on compound-specific14C analysis with accelerator mass spectrometry (CSRA AMS) is reported. Time-dependent increase in the total content of14C-bearing organic compounds in solution (TO14C) was determined by AMS and the main organic corrosion products that are14C-bearing formate, acetate and lactate were identified by CSRA AMS after a pre-concentration step. The concentration of the14C-bearing organic compounds was found to be very low (fmol to pmol14C/L). Stable carbon compounds were identified and quantified while the source of stable carbon in the system has not yet been identified and the temporal evolution of the concentration of these carbon species is presently not understood.

Sign in / Sign up

Export Citation Format

Share Document