Tribological behavior of polyalphaolefin with the addition of nickel nanoparticles

2010 ◽  
Vol 43 (12) ◽  
pp. 2327-2332 ◽  
Author(s):  
R. Chou ◽  
A. Hernández Battez ◽  
J.J. Cabello ◽  
J.L. Viesca ◽  
A. Osorio ◽  
...  
2012 ◽  
Vol 189 ◽  
pp. 214-217
Author(s):  
Zhi Guo Liu

Graphite encapsulated nickel nanoparticles were prepared by ball-milling and subsequent annealing a mixture of expanded graphite and nickel powders. The products were characterized by transmission electron microscope (TEM), and their tribological behavior used as lubricating additive was investigated by using a high-temperature tribo-tester. The morphology of the worn tribo-surfaces was observed by scanning electron microscope (SEM). The results show that as-prepared graphite encapsulated nickel nanoparticles with a size range of 10-150 nm have a marked anti-friction and wear resistance effect, and the larger the applied load, the lower the friction coefficient and the wear severity.


2018 ◽  
Vol 53 (3) ◽  
pp. 578-586 ◽  
Author(s):  
P.N. Tsygvintsev ◽  
◽  
L.I. Goncharova ◽  
K.V. Manin ◽  
V.M. Rachkova ◽  
...  

Author(s):  
Renan Magnol ◽  
Marciano Macedo ◽  
Marcelo de Macêdo ◽  
Cherlio Scandian

2020 ◽  
Vol 2020 (9) ◽  
pp. 13-17
Author(s):  
Yuriy Ryzhov ◽  
Svetlana Abramova

There is carried out a number of experiments with the purpose of analyzing SOTS impact upon both finishing productivity, and physical-chemical state and tribological behavior of surfaces machined, and also a possibility for creation according to the results of the investigations carried out a relatively universal micro-emulsion SOTS based on existing in the Ukraine the line of oils, PAV, corrosion inhibitors, alloying additives etc. As SOTS samples there were used both well-known compouds, for example, Camix, Nope Right (USA), and carbamide having in its structure boron, boron-phosphorus-containing additive, water-solvable phosphate, tributyl phosphate (oil-solvable), concentrate SOTS tribol, having in its structure compounds of boron, nitrogen and phosphorous; ethylic ether of fatty acids; methyl ether of colza oil; Sarkozyl-O having in its structure easily-decomposable chlorine compounds. From the results obtained it is possible to draw a conclusion that during finishing in the environment of water-compatible SOTS an important role in the formation of the properties of the surface worked is played by hydrocarbon components and additives which contribute to the formation of the thinnest surface layers modified with carbon and oxygen.


2020 ◽  
Vol 62 (12) ◽  
pp. 1243-1250
Author(s):  
Fahri Vatansever ◽  
Alpay Tamer Erturk ◽  
Erol Feyzullahoglu

2019 ◽  
Vol 61 (6) ◽  
pp. 543-548
Author(s):  
Aslı Gunay Bulutsuz ◽  
Mehmet Emin Yurci ◽  
Kadir Ozaltin ◽  
Witold Chrominski ◽  
Malgorzata Lewandowska

2010 ◽  
Vol 1 (2) ◽  
pp. 123-128
Author(s):  
Mohammad A. Chowdhury ◽  
Dewan M. Nuruzzaman ◽  
Mohammad L. Rahaman

2020 ◽  
Vol 10 ◽  
Author(s):  
Amutha Santhanam ◽  
Naveen Kumar Chandrasekharan ◽  
Rajangam Ilangovan

Background: The occurrence of Cancer results in cellular changes that causes the uncontrolled growth and division of cells. Apoptosis removes cells during development and eliminates the potentially cancerous cells. The bioactive compounds present in the herbal plant shows cytotoxic activity that result in apoptosis. The traditional herbal plants are used world-wide both in allopathy and other traditional ways. Objective: The main objective of this study is to extract the bioactive compound Quercetin from the medicinally significant plant Ocimum sanctum and also to develop nanomedicine as Qu-PEG-NiGs. Materials and Methods: Leaf extract of the medicinally significant plant Ocimum sanctum (O. sanctum) has been used for the synthesis of nickel nanoparticles (NiGs) and extraction of quercetin (Qu). The ethanolic extract of Ocimum sanctum is added to 1 mM Nickel Nitrate (Ni(NO3)2) and stirred for 3 hrs at RT and dried at 60°C for 3hrs and calcinated at 400°C for 2hrs and characterized using Uv-Vis Spectrophotometer, FT-IR, SEM, DLS and Zeta potential. The Quercetin is isolated from Ocimum sanctum leaf extract using the reflux condenser method. The bio-polymer is being PEG-coated over NiGs and Quercetin is loaded into it. The apoptosis activity using MCF-7 cells is performed with Qu-PEG-NiGs. The purity of Quercetin is characterized using HPLC. In order to analyse apoptosis efficiency, MTT assay, Reactive Oxygen Species (ROS), Cell cycle analysis has been performed. Results: The NiGs absorption spectrum gives a peak at 408nm. The FT-IR confirms the presence of particular functional groups shifting from the compound NiGs and then coated with PEG-Qu-NiGs. The SEM images show the size of NiGs ranging from 27.3 nm to 40.4 nm with varied morphology such as hexagonal and other irregular shapes. The presence of Quercetin extracted from the leaf powder is approximately 1.5 mg/g. The ROS results show the Qu-PEG-NiGs induced efficiency of the apoptosis, while the increased concentrations promote ROS and lead to activation of the apoptosis. The cell cycle analysis has shown the cytotoxic effect. Conclusion: PEG-coated nickel nanoparticles can be used as a promising chemotherapeutic agent against MCF7 breast cancer cells. It is the evidence to further studies for evaluating Qu-PEG-NiGs anticancer activity on different types of cancer cells.


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