The Electrochemical Surface Forces Apparatus: The Effect of Surface Roughness, Electrostatic Surface Potentials, and Anodic Oxide Growth on Interaction Forces, and Friction between Dissimilar Surfaces in Aqueous Solutions

Langmuir ◽  
2012 ◽  
Vol 28 (36) ◽  
pp. 13080-13093 ◽  
Author(s):  
Markus Valtiner ◽  
Xavier Banquy ◽  
Kai Kristiansen ◽  
George W. Greene ◽  
Jacob N. Israelachvili
Keyword(s):  
Surface Roughness ◽  
Aqueous Solutions ◽  
Anodic Oxide ◽  
Surface Forces ◽  
Oxide Growth ◽  
Surface Forces Apparatus ◽  
Interaction Forces ◽  
Surface Potentials ◽  
Effect Of Surface

scholarly journals Stick–slip friction of gecko-mimetic flaps on smooth and rough surfaces

2015 ◽  
Vol 12 (104) ◽  
pp. 20141346 ◽  
Author(s):  
Saurabh Das ◽  
Nicholas Cadirov ◽  
Sathya Chary ◽  
Yair Kaufman ◽  
Jack Hogan ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Silica Surface ◽  
Surface Forces ◽  
Surface Forces Apparatus ◽  
Stick Slip ◽  
Theoretical Approaches ◽  
Frictional Forces ◽  
Modified Surface ◽  
Glass Surfaces ◽  
Effect Of Surface

The discovery and understanding of gecko ‘frictional-adhesion’ adhering and climbing mechanism has allowed researchers to mimic and create gecko-inspired adhesives. A few experimental and theoretical approaches have been taken to understand the effect of surface roughness on synthetic adhesive performance, and the implications of stick–slip friction during shearing. This work extends previous studies by using a modified surface forces apparatus to quantitatively measure and model frictional forces between arrays of polydimethylsiloxane gecko footpad-mimetic tilted microflaps against smooth and rough glass surfaces. Constant attachments and detachments occur between the surfaces during shearing, as described by an avalanche model. These detachments ultimately result in failure of the adhesion interface and have been characterized in this study. Stick–slip friction disappears with increasing velocity when the flaps are sheared against a smooth silica surface; however, stick–slip was always present at all velocities and loads tested when shearing the flaps against rough glass surfaces. These results demonstrate the significance of pre-load, shearing velocity, shearing distances, commensurability and shearing direction of gecko-mimetic adhesives and provide us a simple model for analysing and/or designing such systems.

Effect of Surface Roughness and Electrostatic Surface Potentials on Forces Between Dissimilar Surfaces in Aqueous Solution

2011 ◽  
Vol 23 (20) ◽  
pp. 2294-2299 ◽  
Author(s):  
Markus Valtiner ◽  
Kai Kristiansen ◽  
George W. Greene ◽  
Jacob N. Israelachvili
Keyword(s):  
Aqueous Solution ◽  
Surface Roughness ◽  
Surface Potentials ◽  
Effect Of Surface

Direct measurement of surface forces between sapphire crystals in aqueous solutions

1988 ◽  
Vol 3 (3) ◽  
pp. 413-416 ◽  
Author(s):  
R. G. Horn ◽  
D. R. Clarke ◽  
M. T. Clarkson
Keyword(s):  
Aqueous Solution ◽  
Surface Chemistry ◽  
Aqueous Solutions ◽  
Single Crystal ◽  
Electrical Double Layer ◽  
Dlvo Theory ◽  
Substrate Material ◽  
Surface Forces ◽  
Surface Forces Apparatus ◽  
Single Crystal Sapphire

Measurements are presented of the electrical double layer and van der Waals forces between the (0001) surfaces of two single-crystal sapphire platelets immersed in an aqueous solution of NaCl at pH values from 6.7 to 11. The results fit the standard Deryaguin-Landau-Verwey-Overbeek (DLVO) theory, with a Hamaker constant of 6.7 × 10−20 J. These are the first measurements made using the Israelachvili surface forces apparatus without mica as a substrate material, and they demonstrate the possibility of using this technique to explore the surface chemistry of a wider range of materials.

Molecular Interactions of a Polyaromatic Surfactant C5Pe in Aqueous Solutions Studied by a Surface Forces Apparatus

2012 ◽  
Vol 116 (36) ◽  
pp. 11187-11196 ◽  
Author(s):  
Jing Wang ◽  
Qingye Lu ◽  
David Harbottle ◽  
Johan Sjöblom ◽  
Zhenghe Xu ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Molecular Interactions ◽  
Surface Forces ◽  
Surface Forces Apparatus

scholarly journals Polymer-Cushioned Bilayers. II. An Investigation of Interaction Forces and Fusion Using the Surface Forces Apparatus

1999 ◽  
Vol 77 (3) ◽  
pp. 1458-1468 ◽  
Author(s):  
Joyce Y. Wong ◽  
Chad K. Park ◽  
Markus Seitz ◽  
Jacob Israelachvili
Keyword(s):  
Surface Forces ◽  
Surface Forces Apparatus ◽  
Interaction Forces

The effect of surface roughness on AES depth profile.

Shinku ◽  
1987 ◽  
Vol 30 (10) ◽  
pp. 793-798 ◽  
Author(s):  
Masao HIRASAKA ◽  
Masao HASHIBA ◽  
Toshiroh YAMASHINA
Keyword(s):  
Surface Roughness ◽  
Depth Profile ◽  
Effect Of Surface

scholarly journals Effects of Roughness on Stresses in an Oxide Scale Formed on a Superalloy Substrate

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 479
Author(s):  
Yang Zhao ◽  
Fan Sun ◽  
Peng Jiang ◽  
Yongle Sun
Keyword(s):  
Residual Stress ◽  
Surface Roughness ◽  
Residual Stresses ◽  
Oxide Scale ◽  
Rough Surface ◽  
Alumina Scale ◽  
Growth Stress ◽  
Oxide Growth ◽  
Substrate Thickness ◽  
Roughness Effect

The effects of surface roughness on the stresses in an alumina scale formed on a Fecralloy substrate are investigated. Spherical indenters were used to create indents with different radii and depths to represent surface roughness and then the roughness effect was studied comprehensively. It was found that the residual stresses in the alumina scale formed around the rough surface are almost constant and they are dominated by the curvature rather than the depth of the roughness. Oxidation changes the surface roughness. The edge of the indent was sharpened after oxidation and the residual stress there was released presumably due to cracking. The residual stresses in the alumina scale decrease with increase in oxidation time, while the substrate thickness has little effect, given that the substrate is thicker than the alumina scale. Furthermore, the effect of roughness on the oxide growth stress is analysed. This work indicates that the surface roughness should be considered for evaluation of stresses in coatings.

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