Preparation of Ni Nanoparticles and Evaluation of Their Tribological Performance as Potential Additives in Oils

1999 ◽  
Vol 123 (3) ◽  
pp. 441-443 ◽  
Author(s):  
Sunqing Qiu ◽  
Zhongrong Zhou ◽  
Junxiu Dong ◽  
Guoxu Chen
Keyword(s):  
Direct Contact ◽  
Sodium Dodecyl ◽  
Tribological Performance ◽  
Ni Nanoparticles ◽  
Test Results ◽  
Wear Scar Diameter ◽  
Relative Percentage ◽  
Lubricating Oils ◽  
Deposit Film ◽  
Ball Test

The application of nanoparticles in tribology has received considerable attention in recent years. In this paper, we described the preparation of Ni nanoparticles in microemulsions of sodium dodecyl sulphate (SDS)/isopentanol/cyclohexane/water and their tribological performance as additives in oils. The size of these nanoparticles is about 10 nm, and their shape is spherical. The four-ball test results indicate that Ni nanoparticles are potential additives for lubricating oils, and the tribological performance of lubricating oils can be improved significantly by dispersing Ni nanoparticles in oils. The maximum non-seizure load (PB) has been increased by 67 percent as compared with background oil. The wear scar diameter has been reduced from 0.71 mm to 0.49 mm. The relative percentage in friction coefficient has decreased 26 percent. The tribological mechanism is that a deposit film in the contacting regions was formed, which prevented the direct contact of rubbing surfaces and greatly reduced the frictional force between the contacting surfaces.

Tribological Properties of the Castor Oil Affected by the Additive of the Ionic Liquid [HMIM]BF4

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
Qian Shanhua ◽  
Chen Xuliang ◽  
Liu Liguo ◽  
Li Qingzhong
Keyword(s):  
Ionic Liquid ◽  
Tribological Properties ◽  
Castor Oil ◽  
Wear Behavior ◽  
Physical Adsorption ◽  
Engineering Application ◽  
Test Results ◽  
Test Rig ◽  
Wear Scar Diameter ◽  
Ball Test

The influence of the ionic liquid used as the additive on the tribological properties of castor oil is investigated using a four-ball test rig. The additive percentages of ionic liquid in castor oil are 0.6 wt.%, 1 wt.%, 2 wt.%, and 3 wt.%. The test results show that a small amount of ionic liquid can postpone the peak coefficient of friction and decrease the wear behavior of castor oil. The minimum of the wear scar diameter (WSD) occurs at 1 wt.% ionic liquid. It seems that the chemical adsorption of castor oil and ionic liquid on the steel surface is more significant than the physical adsorption. This study should be of great importance of understanding the potential engineering application of castor oil.

scholarly journals Tribochemistry and EP Activity Assessment of Mo-S Complexes in Lithium-Base Greases

2008 ◽  
Vol 2008 ◽  
pp. 1-6 ◽  
Author(s):  
Tarunendr Singh
Keyword(s):  
Electron Spectroscopy ◽  
Auger Electron ◽  
Wear Scar ◽  
Extreme Pressure ◽  
Flash Temperature ◽  
Wear Scar Diameter ◽  
Activity Assessment ◽  
Temperature Parameter ◽  
Ball Test ◽  
Base Grease

The blends of bis(1,5-diaryl-2,4-dithiomalonamido)dioxomolybdenum(VI) complexes in lithium-base grease are evaluated for their extreme pressure activity in a “four-ball test” using 12.7 mm diameter alloy steel ball specimen. The additive, bis(1,5-di-p-methoxyphenyl-2,4-dithiomalonamido)dioxomolybdenum(VI) and bis(1,5-di-p-chloro-phenyl-2,4-dithiomalonamido)dioxomolybdenum(VI) exhibited lower values of wear-scar diameter at higher load and higher values of weld load, flash temperature parameter, and pressure wear index as compared with lithium-base grease without additives. The greases fortified with the developed additives prevent rusting and corrosion of bearings while grease containing no additives did not pass these tests as per the standard tests. These greases have also better oxidation protection as compared to the grease that has no additive. The topography and tribochemistry of the wear-scar surface are carried out by means of scanning electron microscopy and Auger electron spectroscopy techniques, respectively.

scholarly journals EFFECTS OF HUMAN PLATELET LYSATES WITHOUT ADDITIONAL GROWTH FACTORS ON THE PROTEIN PROFILES OF HUMAN UMBILICAL VEIN ENDOTHELIAL CELL CULTURE MEDIA

2017 ◽  
Vol 10 (17) ◽  
pp. 54
Author(s):  
Hazriani Ra ◽  
Lisa Amir ◽  
Ratna Farida
Keyword(s):  
Culture Media ◽  
Umbilical Vein ◽  
Protein Profile ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Test Results ◽  
Control Groups ◽  
Cell Culture Media ◽  
Endothelial Cell Culture ◽  
Fetal Bovine

Objectives: The objective of this study is to evaluate the effect of HPLs with no additional GFs on the HUVEC protein profile. Methods: HUVEC cultures were examined in groups as follows: Fetal bovine serum (FBS), 2%-HPL with a GF, and 2%- and 5%-HPL without a GF which were analyzed with a sodium dodecyl sulfate-polyacrylamide gel electrophoresis test. Results: The intensity, thickness, and molecular weight of HUVEC band proteins cultured without a GF were not significantly different compared to the control groups (FBS or HPL with a GF). Conclusions: No difference was found in the HUVEC protein profile after they were cultured with FBS and HPLs, with or without GFs.

Fabrication of Bionic Silicon Surfaces with Lotus Effect and their Micro Tribological Performance

2010 ◽  
Vol 97-101 ◽  
pp. 1393-1398 ◽  
Author(s):  
Xi Qiu Fan
Keyword(s):  
Surface Effect ◽  
Tribological Performance ◽  
Friction Reduction ◽  
Silicon Surfaces ◽  
Test Results ◽  
Feature Size ◽  
Lotus Effect ◽  
Lotus Leaf ◽  
Novel Approach ◽  
Leaf Surfaces

With the miniature of micro-electromechanical systems (MEMS), surface effect is substantially increased, and the resulting friction, abrasion and stiction are becoming bottlenecks of the development of MEMS industry. In this paper, firstly, the feature size and topography on lotus leaf surfaces is investigated, as well as the mechanism of lotus effect applied in MEMS to reduce friction and prevent stiction is analyzed; secondly, two approaches of fabricating bionic silicon surfaces with lotus effect are proposed; finally, test results on the micro tribological performance of the mimicked silicon surfaces are presented, which demonstrates that to mimic lotus effect on silicon surfaces is a novel approach to prevent stiction and reduce friction . However, the effectiveness of stiction prevention and friction reduction is related to the size and shape of the textured structures.

scholarly journals Effects of Graphene Oxide on the Structure and Properties of Regenerated Wool Keratin Films

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1318 ◽  
Author(s):  
Bo Li ◽  
Jinbo Yao ◽  
Jiarong Niu ◽  
Jianyong Liu ◽  
Le Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Test Results ◽  
Chemical Methods ◽  
Sds Page ◽  
Mechanism Of Interaction ◽  
Ft Ir ◽  
Ir And Raman

Much research has focused on improvement of the structural and mechanical properties of regenerated keratin materials by physical or chemical methods in recent years. In this research, regenerated keratin materials were modified with graphene oxide (GO). The properties of modified keratin films and the mechanism of interaction between GO and keratin macromolecules were studied. The SEM and XRD test results showed that the orientation of keratin macromolecules could be effectively improved by GO, which favored improvement of the keratin material’s crystallinity and made the films more uniform and compact. The thermal stability and mechanical properties of GO-modified keratin films were also improved significantly. At the same time, the reaction mechanism between keratin and GO materials was analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), FT-IR, and Raman spectroscopy. It was shown that there was no chemical reaction between GO and keratin molecules, and the interaction between them was mainly via hydrogen bonding and van der Waals forces.

Effect of hBN/Al2O3 Nanoparticle Additives on the Tribological Performance of Engine Oil

2014 ◽  
Vol 66 (3) ◽  
Author(s):  
Muhammad Ilman Hakimi Chua Abdullah ◽  
Mohd Fadzli Abdollah ◽  
Hilmi Amiruddin ◽  
Noreffendy Tamaldin ◽  
Nur Rashid Mat Nuri
Keyword(s):  
Diesel Engine ◽  
Hexagonal Boron Nitride ◽  
Fuel Efficiency ◽  
Tribological Performance ◽  
Engine Oil ◽  
Wear Scar Diameter ◽  
Engine Wear ◽  
The Coefficient Of Friction ◽  
Al2o3 Nanoparticle ◽  
Nanoparticle Additives

Nanotechnology currently has an important role in reducing engine wear and improving fuel efficiency within engines using nanoparticle additives in engine oil. In this work, the effect of hexagonal boron nitride (hBN) and alumina (Al2O3) nanoparticle additives, on the tribological performance of SAE 15W40 diesel engine oil, was studied. A tribological test was conducted using a four-ball tribotester. The results show that the coefficient of friction (COF) and wear rate of the ball reduced significantly by dispersing hBN nanoparticle additives in SAE 15W40 diesel engine oil; compared to without or with Al2O3 nanoparticle additives. This is in accordance with the significant reduction of wear scar diameter and smoother worn surfaces observed on the balls.

Anti-Seizure Properties of Biodegradable Lubricating Oils in Four-Ball Test

2002 ◽  
Vol 2002.40 (0) ◽  
pp. 383-384
Author(s):  
Yoshitomo NODA ◽  
Hiromasa NADANO ◽  
Masakazu NAKASAKO ◽  
Masaki KOHNO ◽  
Ichiro MINAMI
Keyword(s):  
Lubricating Oils ◽  
Ball Test

Antiwear and extreme pressure performance of castor oil with nano-additives

2017 ◽  
Vol 232 (9) ◽  
pp. 1055-1067 ◽  
Author(s):  
Rajeev Nayan Gupta ◽  
AP Harsha
Keyword(s):  
Castor Oil ◽  
Sodium Dodecyl ◽  
Wear Scar ◽  
Suspension Stability ◽  
Additive Concentration ◽  
Extreme Pressure ◽  
Wear Scar Diameter ◽  
Load Carrying ◽  
Nano Additives ◽  
Analytical Tools

The aim of the present study is to examine the antiwear, antifriction, and extreme pressure performance of castor oil with nano-additives by using a four-ball tester. CeO2 (≈90 nm) and polytetrafluroethylene (≈150 nm) nanoparticles were used as an additive in castor oil with four different concentrations in the range of 0.1–1.0% w/v. The suspension stability of the nanoparticles was improved by using sodium dodecyl sulfate as a dispersant. Different analytical tools were used to characterize the nanoparticles parameter (i.e. shape and size) as well as the worn surfaces. The additive concentration was optimized on the basis of tribological performance. The test results of antiwear and extreme pressure property have been reported on the basis of wear scar diameter and weld load, respectively. For the antiwear test, it was observed that the maximum reduction in the wear scar diameter was 37.4 and 35.3% at an optimum concentration of CeO2 and polytetrafluroethylene additive, respectively. Also, antifriction and load carrying properties of castor oil were significantly improved with the addition of nanoparticles as an additive in a small amount. The mechanism for such improvement in the tribological behavior has also been discussed.

scholarly journals Tribological Properties of a Self-Repairing Material: Functionalized Graphene/montmorillonite Nanosheets Lubricant Additives

2021 ◽  
Author(s):  
Yujunwen Li ◽  
Rui Yang ◽  
Wu Lei ◽  
Qingli Hao
Keyword(s):  
Photoelectron Spectroscopy ◽  
Friction Pair ◽  
Functionalized Graphene ◽  
Test Results ◽  
Wear Scar Diameter ◽  
Green Method ◽  
X Ray ◽  
Lubricant Property ◽  
Weak Interlayer ◽  
Worn Surface

Abstract The functionalized graphene/montmorillonite (FG/MTT) nanosheets were synthesized through chemically bonding by a simple, green method, which has remarkable dispersion stability in oil and its lubricating performance was evaluated by a four-ball tribometer. The test results show that FG/MTT has a preeminent lubricant property when the concentration is 0.4 mg/ml. Compared with the bare oil sample, its average friction coefficient (FC) and wear scar diameter (WSD) decrease by 50.4 % and 13.2 %, respectively. The synergistic effect between FG and MTT was further explored by comparing the lubricant mechanism of the different additives. After synthetically analyzing worn surface by means of scanning electron microscopy and X-ray photoelectron spectroscopy, the lubrication mechanism of the FG/MTT nanocomposite as oil additive is discussed and postulated: The FG/MTT with weak interlayer adhesion is filled between the friction pairs to avoid contact and clinging of some asperities, and the sliding between the layers plays a role in lubrication. Furthermore, FG/MTT will react with the surface of the friction pair to form a repair layer composed of Fe2O3, SiC, SiO2, and aluminosilicate, mending the grinding surface and promoting the hardness after friction.

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