scholarly journals Optical Interferometry Measurement of BSA Adsorption in Hydrodynamic Lubrication

2015 ◽  
Author(s):  
X. Li ◽  
F. Guo ◽  
P.L. Wong
Keyword(s):  
Aqueous Solution ◽  
Film Thickness ◽  
Real Time ◽  
Adsorption Layer ◽  
Hydrodynamic Lubrication ◽  
Optical Interferometry ◽  
Adsorption Film ◽  
Lubrication Conditions ◽  
Bsa Adsorption

The formation of adsorption layer of BSA aqueous solution under hydrodynamic lubrication conditions was studied using optical interferometry. The adsorption film was analysed and found consisting of two types of adsorption. A two-media approach was derived to determine the adsorption film thickness in real time.

Further Experiments on the Sealing Mechanism of a Synthetic Rubber Lip Type Seal Operating on a Rotating Shaft

1973 ◽  
Vol 187 (1) ◽  
pp. 361-367 ◽  
Author(s):  
E. T. Jagger ◽  
D. Wallace
Keyword(s):  
Surface Tension ◽  
Film Thickness ◽  
Liquid Film ◽  
Hydrodynamic Lubrication ◽  
Contact Angles ◽  
Rotating Shaft ◽  
Synthetic Rubber ◽  
Sealing Mechanism ◽  
Inside Out ◽  
Lubrication Conditions

The paper shows that a seal of the type referred to operates under hydrodynamic lubrication conditions with a liquid film thickness of obout 0·5 μm. Contact angles of oil against rubber and steel are measured, and it is also shown by experiments with capillaries how a meniscus may be turned inside out to resist pressure. The conclusion is that the liquid film is prevented from leaking by the surface tension of the liquid itself.

In Situ Observation of Formation Behavior of Adsorption Film in the Narrow Space Using Surface Plasmon Resonance (SPR) Method

2017 ◽  
Vol 739 ◽  
pp. 56-62
Author(s):  
Koki Fukuta ◽  
Satoru Maegawa ◽  
Fumihiro Itoigawa ◽  
Takashi Nakamura
Keyword(s):  
Surface Plasmon Resonance ◽  
Film Thickness ◽  
Real Time ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Film Growth ◽  
High Sensitivity ◽  
Adsorption Film ◽  
Base Oil

In this paper, an application of the surface plasmon resonance (SPR) method to real-time and in-situ measurements of changes in adsorption film thickness, e.g., fatty acid adsorbed films, is presented. As discussed in the previous study, the high sensitivity and overall simplicity of its optical system make the SPR method advantageous for monitoring lubricant film thickness. In order to demonstrate the high sensitivity of the SPR method, in-situ and real-time adsorption film growth processes of stearic acid (additives) in hexadecane (base oil) were monitored using the Otto configuration. Based on a comparison between experimental and model calculation results, changes in the adsorption film thickness during a series of different contact tests were measured.

Lubrication Phenomena in Spur Gears: Capacity, Film Thickness Variation, and Efficiency

1965 ◽  
Vol 87 (3) ◽  
pp. 655-663 ◽  
Author(s):  
R. Wayne Adkins ◽  
E. I. Radzimovsky
Keyword(s):  
Shear Stress ◽  
Film Thickness ◽  
Pressure Distribution ◽  
Power Loss ◽  
Hydrodynamic Lubrication ◽  
Thickness Variation ◽  
Spur Gears ◽  
Oil Film ◽  
Lubrication Conditions ◽  
Lubricant Viscosity

In this paper the oil film separating the mating surfaces of involute spur gears operating under hydrodynamic lubrication conditions is analyzed. This analysis surpasses previous analyses in as much as the actual motion of the involute profiles (rolling, sliding, and squeezing motion) and the total number of teeth engaged at any one time are considered. Expressions are derived for the pressure distribution, shear stress, and power loss in the oil film at any phase of tooth engagement. A method is developed by which these expressions can be applied to determine the film thickness at any instant and the power loss for a given load, speed, and lubricant viscosity.

Further Experiments on the Sealing Mechanism of a Synthetic Rubber Lip Type Seal Operating on a Rotating Shaft

1973 ◽  
Vol 187 (1) ◽  
pp. 361-367 ◽  
Author(s):  
E. T. Jagger ◽  
D. Wallace
Keyword(s):  
Surface Tension ◽  
Film Thickness ◽  
Liquid Film ◽  
Hydrodynamic Lubrication ◽  
Contact Angles ◽  
Rotating Shaft ◽  
Synthetic Rubber ◽  
Sealing Mechanism ◽  
Inside Out ◽  
Lubrication Conditions

The paper shows that a seal of the type referred to operates under hydrodynamic lubrication conditions with a liquid film thickness of obout 0·5 μm. Contact angles of oil against rubber and steel are measured, and it is also shown by experiments with capillaries how a meniscus may be turned inside out to resist pressure. The conclusion is that the liquid film is prevented from leaking by the surface tension of the liquid itself.

A Simulation of Hydrodynamic Lubrication on Non-Glazed Surfaces under Different Sliding Velocities and Loads

2007 ◽  
Vol 353-358 ◽  
pp. 827-830
Author(s):  
Peng Li ◽  
Jian Li ◽  
Yong Zhen Zhang ◽  
M. Scherge
Keyword(s):  
Wear Resistance ◽  
Film Thickness ◽  
Pressure Distribution ◽  
Hydrodynamic Lubrication ◽  
Maximum Pressure ◽  
Minimum Film Thickness ◽  
Pin On Disk ◽  
Lubrication Conditions

Recent researches have found that surfaces with non-glazed or laser dimpling topography offer improved lubricating efficiency and wear resistance under lubrication conditions over their conventional glazed status. It was carried out in this paper to simulate a pin-on-disk experimental condition and perform hydrodynamic lubrication (HL) calculations for both non-glazed and glazed surfaces under conditions of different sliding velocities and loads with a view of understanding the tribological mechanism and characteristics of non-glazed surfaces. The results showed that the minimum film thickness of non-glazed surfaces, which closed to a typical elasto-hydrodynamic lubrication (EHL) film thickness, was thicker than that of glazed surfaces under the condition of low sliding velocities and small loads. At the same time, a decreased maximum pressure of full-film of non-glazed surfaces demonstrated an even pressure distribution on them.

Effectiveness of multi-shape laser surface texturing in the reduction of friction under lubrication regime

2016 ◽  
Vol 68 (1) ◽  
pp. 116-124 ◽  
Author(s):  
Dawit Zenebe Segu ◽  
Pyung Hwang
Keyword(s):  
Hydrodynamic Lubrication ◽  
Surface Texturing ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Textured Surface ◽  
Content Type ◽  
Laser Ablation Process ◽  
Specific Formula ◽  
Steel Surfaces ◽  
Lubrication Conditions

Purpose – The purpose of this paper is to investigate and discuss the effect of multi-shape laser surface texturing (LST) steel surfaces on tribological performance. Design/methodology/approach – The textured surface with some specific formula arrays was fabricated by laser ablation process by combining patterns of circles and triangles, circles and squares and circles and ellipses. The tribological test was performed by a flat-on-flat tribometer under dry and lubrication conditions, and results were compared with that of untextured surface. Findings – The results showed that the textured surface had better friction coefficient performance than the untextured surface due to hydrodynamic lubrication effect. Through an increase in sliding speed, the beneficial effect of LST performance was achieved under dry and lubrication conditions. Originality/value – This paper develops multi-shape LST steel surfaces for improving the friction and wear performance under dry and lubrication conditions.

Optoelectronic Properties of Plasma CVD a-Si:H Modified by Filament-Generated Atomic H

1992 ◽  
Vol 258 ◽  
Author(s):  
Y.M. Li ◽  
I. An ◽  
M. Gunes ◽  
R.M. Dawson ◽  
R.W. Collins ◽  
...  
Keyword(s):  
Film Thickness ◽  
Real Time ◽  
Chemical Potential ◽  
Defect Density ◽  
Plasma Deposition ◽  
Plasma Cvd ◽  
Near Surface ◽  
Optical Gap ◽  
New Material ◽  
Control Samples

ABSTRACTWe have studied a-Si:H prepared by alternating plasma deposition with atomic H treatments performed with a heated W filament. Real time spectroscopie ellipsometry provides the evolution of film thickness, optical gap, and a measure of the fraction of Si-Si bonds broken in the near-surface (200 Å) during H-exposure of single films. This information guided us to the desired parameters for the H-treatments. Here, we concentrate on a weak hydrogenation regime characterized by minimal etching, a higher H content by 2 at.%, and a larger optical gap by 0.02 eV for the growth/hydrogenation structures in comparison to continuously deposited control samples. This new material has shown an improvement in the defect density in the light-soaked state in comparison to the control samples. This may result from stabilization of the Si structure due to an increase in the H chemical potential in the a-Si:H.

scholarly journals The Effects of Artificially-Produced Defects on the Film Thickness Distribution in Sliding EHD Point Contacts

1982 ◽  
Vol 104 (3) ◽  
pp. 365-375 ◽  
Author(s):  
C. Cusano ◽  
L. D. Wedeven
Keyword(s):  
Film Thickness ◽  
Contact Region ◽  
Thickness Distribution ◽  
Point Contact ◽  
Optical Interferometry ◽  
Point Contacts ◽  
Thickness Profile ◽  
Inlet Region

The effects of artificially-produced dents and grooves on the elastohydrodynamic (EHD) film thickness profile in a sliding point contact are investigated by means of optical interferometry. The defects, formed on the surface of a highly polished ball, are held stationary at various locations within and in the vicinity of the contact region while the disk is rotating. It is shown that the defects, having a geometry similar to what can be expected in practice, can dramatically change the film thickness which exists when no defects are present in or near the contact. This change in film thickness is mainly a function of the position of the defects in the inlet region, the geometry of the defects, the orientation of the defects in the case of grooves, and the depth of the defect relative to the central film thickness.

A new molecular imprinting-based mass-sensitive sensor for real-time detection of 17β-estradiol from aqueous solution

2012 ◽  
Vol 32 (4) ◽  
pp. 1164-1169 ◽  
Author(s):  
Erdoğan Özgür ◽  
Erkut Yılmaz ◽  
Gülsu Şener ◽  
Lokman Uzun ◽  
Rıdvan Say ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Real Time ◽  
Molecular Imprinting ◽  
Sensitive Sensor ◽  
17Β Estradiol ◽  
Real Time Detection
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