Adsorption and Tribochemical Reactions

1989 ◽  
Vol 159 ◽  
Author(s):  
W. M. Mullins ◽  
T. E. Fischer
Keyword(s):  
Free Energy ◽  
Band Gap ◽  
Reaction Rate ◽  
Water Adsorption ◽  
Surface Reaction ◽  
Wear Test ◽  
Aqueous Solubility ◽  
Test Results ◽  
Effect Of Water ◽  
Model Fluids

ABSTRACTA model for chemisorption based on the Lewis theory is proposed and developed. The model reproduces the observed relationship between aqueous solubility and band gap for covalent oxides. A relationship is shown between the calculated free-energy of the surface reactions and the observed effect of water on the wear of these materials. This relationship is explained in terms of surface reaction rate and equilibrium. Similar calculations for the adsorption of -CH3 functional groups are presented. The results are compared to water adsorption calculations and related to experimental wear test results for model fluids on covalent oxides. The effect of water on lubricant adsorption is discussed.

Optimization of Mixture Formation of Diesel Fuel in a Small CI Engine: The Effect of Water (H2O) Injection Into Intake Port

2017 ◽  
Author(s):  
Se Hun Min ◽  
Jeonghyun Park ◽  
Hyun Kyu Suh
Keyword(s):  
Water Injection ◽  
Injection Timing ◽  
Intake Port ◽  
Cylinder Pressure ◽  
Test Results ◽  
Analysis Model ◽  
Simultaneous Reduction ◽  
Effect Of Water ◽  
Rate Of Heat Release ◽  
Ci Engine

The objective of this study is to investigate the effect of water injection into intake port on the performance of small CI engine. The ECFM-3Z model was applied for the combustion analysis model, and the amount of injected water were varied 10%, 20% and 30% of injected fuel mass. The results of this work were compared in terms of cylinder pressure, rate of heat release (ROHR), and the ISNO and soot emissions. It was found that the cylinder pressure was decreased from 1.2% to 9.2% when the amount of injected water was increased from 10% to 30%. In the results, NO emission significantly decreased from about 24% to about 85% when the amount of injected water increased due to the specific heat and latent heat of water. Considering the test results, the best conditions for the simultaneous reduction of NO and soot is the BTDC 05deg of injection timing and 30% of water injection mass. It can be expected the best IMEP and ISFC characteristics.

scholarly journals Effect of Water Adsorption on Conductivity in Epitaxial Sm0.1Ce0.9O2-  Thin Film for Micro Solid Oxide Fuel Cells Applications

2015 ◽  
Vol 69 (16) ◽  
pp. 39-48 ◽  
Author(s):  
N. Yang ◽  
E. Strelcov ◽  
A. Belianinov ◽  
A. Tebano ◽  
V. Foglietti ◽  
...  
Keyword(s):  
Thin Film ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Water Adsorption ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Effect Of Water

Can the anomalous aqueous solubility of β-cyclodextrin be explained by its hydration free energy alone?

2008 ◽  
Vol 10 (22) ◽  
pp. 3236 ◽  
Author(s):  
Wensheng Cai ◽  
Tingting Sun ◽  
Xueguang Shao ◽  
Christophe Chipot
Keyword(s):  
Free Energy ◽  
Aqueous Solubility ◽  
Hydration Free Energy

Effect of Water Adsorption on Microtribological Properties of Hydrogenated Diamond-Like Carbon Films

2004 ◽  
Vol 17 (3) ◽  
pp. 575-580 ◽  
Author(s):  
Masahito Tagawa ◽  
Masashi Ikemura ◽  
Yoshihito Nakayama ◽  
Nobuo Ohmae
Keyword(s):  
Water Adsorption ◽  
Carbon Films ◽  
Diamond Like Carbon ◽  
Effect Of Water

Effect of nano Al2O3 coated Ag reinforced Cu matrix nanocomposites on mechanical and tribological behavior synthesis by P/M technique

2020 ◽  
Vol 54 (30) ◽  
pp. 4921-4928
Author(s):  
A Mohamed ◽  
MM Mohammed ◽  
AF Ibrahim ◽  
Omyma A El-Kady
Keyword(s):  
Wear Behavior ◽  
Composite Coatings ◽  
Microstructural Analysis ◽  
Wear Test ◽  
Test Results ◽  
X Ray Diffraction ◽  
X Ray ◽  
Average Hardness ◽  
Ag Particles ◽  
Matrix Nanocomposites

In this study, copper powder was reinforced with different weight percentages of Al2O3 particles (0, 5, 10, and 15 wt.% Al2O3 coated Ag) to produce Cu-Al2O3 composites by mechanical alloying and uniaxial cold pressing/sintering route. Electro-less deposition was used to coat Al2O3 particles with Ag. The microstructure of the consolidated samples was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) elemental mapping. The porosity, microhardness, and wear behavior of the consolidated samples were also investigated as a function of Al2O3 content. The EDX mapping images reveal that the Al2O3 reinforcement particles were homogeneously distributed into the Cu matrix. Microstructural analysis shows that the addition of Al2O3 coated Ag particles improves density of the composites coating. SEM micrographs result shows that slight porosities exist in the composites produced. Furthermore, the average hardness of the composite coatings varies from 72.3 to 187.6 HV as Al2O3 content increases from 0 to 15 wt.%. The wear test results showed that the composite with higher Al2O3 content 15 wt.% showed the best wear resistance.

Effect of water adsorption on positron–electron annihilation kinetics in the MgO–Al2O3 ceramics in the frequency domain

2019 ◽  
Vol 10 (8) ◽  
pp. 2769-2774 ◽  
Author(s):  
Orest Fl’unt ◽  
Halyna Klym ◽  
Adam Ingram ◽  
Roman Szatanik
Keyword(s):  
Frequency Domain ◽  
Water Adsorption ◽  
Effect Of Water

Performance and Wear Test Results for a 20 kW-Class Ion Engine with Carbon-Carbon Grids

2005 ◽  
Author(s):  
Jay Polk ◽  
Dan Goebel ◽  
John Synder ◽  
Analyn Schneider ◽  
Lee Johnson ◽  
...  
Keyword(s):  
Wear Test ◽  
Test Results

Free Energy and Electronic Properties of Water Adsorption on the SnO2(110) Surface

Langmuir ◽  
2013 ◽  
Vol 29 (18) ◽  
pp. 5487-5499 ◽  
Author(s):  
Gianluca Santarossa ◽  
Konstanze Hahn ◽  
Alfons Baiker
Keyword(s):  
Free Energy ◽  
Electronic Properties ◽  
Water Adsorption
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