The antiwear and extreme pressure action mechanism of CeF3 in grease

1996 ◽  
Vol 8 (4) ◽  
pp. 379-388 ◽  
Author(s):  
Lain Yafeng ◽  
Xue Qunji ◽  
Zhang Xushou
Keyword(s):  
Extreme Pressure ◽  
Action Mechanism

Tribological Study of Xanthate-Containing Acetic Ester as Additives in Hydrogenated Oil

2012 ◽  
Vol 236-237 ◽  
pp. 123-127 ◽  
Author(s):  
Chao Long Li ◽  
Li Ping Xiong ◽  
Hong Liu ◽  
Li Ting Xiong ◽  
Wei Wang
Keyword(s):  
Photoelectron Spectroscopy ◽  
Protective Film ◽  
Extreme Pressure ◽  
Action Mechanism ◽  
Prepared Compound ◽  
X Ray ◽  
Hydrogenated Oil ◽  
Worn Surface ◽  
Scanning Electron ◽  
Sem Analyses

A novel ester derivative, dodecyl xanthate acetic dodecyl xanthate ester(DXAD) was synthesized and it’s tribological behaviors as additives in hydrogenated oil, were evaluated using a four-ball tester. Results show that the compound possesses good antiwear performance, extreme pressure capacity, and good friction-reducing property. The action mechanism was estimated through analysis of the worn surface with X-ray photoelectron spectroscopy (XPS) and Scanning Electron Microscope (SEM). The results of XPS and SEM analyses illustrate that the prepared compound as an additive in hydrogenated oil forms a protective film containing ferric sulfide and ferric sulfate compounds on the rubbed surface.

Antiwear and Extreme-Pressure Action of Copper(II) Complex With Alkyl Phosphonic Acid Mono Alkyl Ester

1996 ◽  
Vol 118 (3) ◽  
pp. 676-680 ◽  
Author(s):  
Ren-Gen Xiong ◽  
Hong Wang ◽  
Jing-Lin Zuo ◽  
Cai-Ming Liu ◽  
Xiao-Zeng You ◽  
...  
Keyword(s):  
Mass Spectroscopy ◽  
Phosphonic Acid ◽  
Fast Atom Bombardment ◽  
Extreme Pressure ◽  
Tricresyl Phosphate ◽  
Action Mechanism ◽  
Monoalkyl Ester ◽  
Antiwear Properties ◽  
Alkylphosphonic Acid ◽  
Antiwear Action

The copper(II) complex with alkylphosphonic acid monoalkyl ester (CuAMP) was synthesized, and its structure shown to be laminar on the basis of fast atom bombardment mass spectroscopy (FABMS). The extreme-pressure, antiwear and antiseizure performance of CuAMP was assessed using a four-ball machine. The results showed that CuAMP exhibits better extreme-pressure and antiwear properties than tricresyl phosphate. Based on the results of surface analysis, the antiwear action mechanism of CuAMP is discussed.

Tribological Performance and Action Mechanism of Cadmium Dialkyldithiophosphate

2005 ◽  
Vol 48 (2) ◽  
pp. 171-175 ◽  
Author(s):  
Hu Jianqiang ◽  
Wei Xianyong ◽  
Yao Junbing ◽  
Xie Feng ◽  
Zhu Huanqin ◽  
...  
Keyword(s):  
Tribological Performance ◽  
Action Mechanism

The Action Mechanism of the Purified Platelet Aggregation Principle of Trimeresurus mucrosquamatus Venom

1979 ◽  
Vol 41 (03) ◽  
pp. 475-490 ◽  
Author(s):  
Chaoho Ouyang ◽  
Che-Ming Teng
Keyword(s):  
Platelet Aggregation ◽  
Adenine Nucleotides ◽  
Muscle Relaxants ◽  
Prostaglandin Synthesis ◽  
Action Mechanism ◽  
Crude Venom ◽  
Platelet Factor ◽  
Induce Platelet Aggregation ◽  
Minimal Concentration ◽  
Aggregation Principle

SummaryThe minimal concentration of the platelet aggregation principle (Platelet Aggregoserpen- tin, PAS) necessary to induce platelet aggregation was 10 ng/ml, about one-hundredth of that of the crude venom. PAS induced the release of platelet factors 3 and 4 from platelets, but the released platelet factor 3 was easily inactivated by the anti-phospholipid effect of PAS. Pretreatment of platelets with neuraminidase potentiated PAS-induced platelet aggregation. PAS-induced platelet aggregation was independent on released ADP; it could occur in the ADP-removing systems, such as apyrase or a combination of phosphoenolpyruvate and pyruvate kinase. However, PAS-induced platelet aggregation could be inhibited by adenine nucleotides and adenosine.PAS-induced platelet aggregation was inhibited by some anti-inflammatory agents, antimalarial drugs, local anesthetics, antihistamine and smooth muscle relaxants. After deaggregation of PAS-treated platelets, thrombin and sodium arachidonate could further induce platelet aggregation, but ADP and second dose of PAS could not. It is concluded that PAS-induced platelet aggregation is due to prostaglandin synthesis. Recent literatures on the mechanism of platelet aggregation were surveyed and the actions of PAS were discussed.

Conventional Versus Natural Alternative Treatments for Leishmaniasis: A Review

2018 ◽  
Vol 18 (15) ◽  
pp. 1275-1286 ◽  
Author(s):  
Luiz Felipe Domingues Passero ◽  
Lucas Antal Cruz ◽  
Gabriela Santos-Gomes ◽  
Eliana Rodrigues ◽  
Márcia Dalastra Laurenti ◽  
...  
Keyword(s):  
Side Effects ◽  
Visceral Leishmaniasis ◽  
Traditional Knowledge ◽  
Conventional Therapy ◽  
Pathogenic Species ◽  
Action Mechanism ◽  
In Vivo Assays ◽  
Clinical Forms

Leishmaniasis is a neglected disease caused by protozoan belonging to the Leishmania genus. There are at least 16 pathogenic species for humans that are able to cause different clinical forms, such as cutaneous or visceral leishmaniasis. In spite of the different species and clinical forms, the treatment is performed with few drug options that, in most cases, are considered outdated. In addition, patients under classical treatment show serious side effects during drug administration, moreover parasites are able to become resistant to medicines. Thus, it is believed and well accepted that is urgent and necessary to develop new therapeutic options to overpass these concerns about conventional therapy of leishmaniasis. The present review will focus on the efficacy, side effects and action mechanism of classic drugs used in the treatment of leishmaniasis, as well as the importance of traditional knowledge for directing a rational search toward the discovery and characterization of new and effective molecules (in vivo assays) from plants to be used against leishmaniasis.

scholarly journals Effect of Size of Multiwalled Carbon Nanotubes Dispersed in Gear Oils for Improvement of Tribological Properties

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Kodanda Rama Rao Chebattina ◽  
V. Srinivas ◽  
N. Mohan Rao
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Ball Milling ◽  
Multiwalled Carbon Nanotubes ◽  
Tribological Properties ◽  
Extreme Pressure ◽  
Multiwalled Carbon ◽  
Pristine Mwcnts ◽  
Gear Oil ◽  
The Stability

The aim of the paper is to investigate the effect of size of multiwalled carbon nanotubes (MWCNTs) as additives for dispersion in gear oil to improve the tribological properties. Since long pristine MWCNTs tend to form clusters compromising dispersion stability, they are mildly processed in a ball mill to shorten the length and stabilized with a surfactant before dispersing in lubricant. Investigations are made to assess the effect of ball milling on the size and structure of MWCNTs using electron microscopy and Raman spectroscopy. The long and shortened MWCNTs are dispersed in EP 140 gear oil in 0.5% weight. The stability of the dispersed multiwalled carbon nanotubes is evaluated using light scattering techniques. The antiwear, antifriction, and extreme pressure properties of test oils are evaluated on a four-ball wear tester. It is found that ball milling of MWCNTs has a strong effect on the stability and tribological properties of the lubricant. From Raman spectroscopy, it is found that ball milling time of up to 10 hours did not produce any defects on the surface of MWCNTs. The stability of the lubricant and the antiwear, antifriction, and extreme pressure properties have improved significantly with dispersion shortened MWCNTs. Ball milling for longer periods produces defects on the surface of MWCNTs reducing their advantage as oil additives.

Action mechanism of a novel herbicide, pyroxasulfone

2009 ◽  
Vol 95 (1) ◽  
pp. 47-55 ◽  
Author(s):  
Yoshitaka Tanetani ◽  
Koichiro Kaku ◽  
Kiyoshi Kawai ◽  
Tomonori Fujioka ◽  
Tsutomu Shimizu
Keyword(s):  
Action Mechanism

scholarly journals A New Model For Hydrogen-Induced Crack (HIC) Growth in Metal Alloy Pipelines Under Extreme Pressure

2020 ◽  
Vol 28 ◽  
pp. 873-885
Author(s):  
Alla V. Balueva ◽  
Ilia N. Dashevskiy ◽  
Jerry Magana
Keyword(s):  
Metal Alloy ◽  
Extreme Pressure ◽  
New Model
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