scholarly journals Rougher is more slippery: How adhesive friction decreases with increasing surface roughness due to the suppression of capillary adhesion

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
Feng-Chun Hsia ◽  
Steve Franklin ◽  
Pierre Audebert ◽  
Albert M. Brouwer ◽  
Daniel Bonn ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Capillary Adhesion

Effect of Surface Roughness and Softness on Water Capillary Adhesion in Apolar Media

2012 ◽  
Vol 116 (25) ◽  
pp. 6481-6488 ◽  
Author(s):  
Soumi Banerjee ◽  
Pieter Mulder ◽  
J. Mieke Kleijn ◽  
Martien A. Cohen Stuart
Keyword(s):  
Surface Roughness ◽  
Capillary Adhesion ◽  
Effect Of Surface

Role of surface roughness in capillary adhesion

2002 ◽  
Vol 16 (4) ◽  
pp. 337-346 ◽  
Author(s):  
Ali Ata ◽  
Yakov I. Rabinovich ◽  
Rajiv K. Singh
Keyword(s):  
Surface Roughness ◽  
Capillary Adhesion

Reduced Microstructure Adhesion Provided by Gas-Expanded Liquid Deposited Gold Nanoparticles

2008 ◽  
Author(s):  
K. M. Hurst ◽  
C. B. Roberts ◽  
W. R. Ashurst
Keyword(s):  
Surface Roughness ◽  
Gold Nanoparticles ◽  
Au Nanoparticles ◽  
Actuation Voltage ◽  
Work Of Adhesion ◽  
Real Contact Area ◽  
Real Contact ◽  
Capillary Adhesion ◽  
Increase Surface Roughness ◽  
Gas Expanded Liquids

In order to alleviate or eliminate the occurrence of stiction during the actuation of microstructures, the real contact area available for contact must be reduced. Au nanoparticles were intentionally deposited using gas-expanded liquids onto polysilicon cantilever beam arrays to increase surface roughness. The nanoparticle-coated beams were subjected to an actuation voltage of 120 V. Following actuation, the adhesion of beams was quantified by estimating the apparent work of adhesion. Au nanoparticles deposited onto these microstructures were shown to drastically reduce the effects of in-use stiction. Capillary adhesion due to condensation of ambient moisture was effectively eliminated.

Roughness measurements of nonlinear optical polymer films by scanning tunneling microscopy

1989 ◽  
Vol 47 ◽  
pp. 22-23
Author(s):  
I. H. Musselman ◽  
R.-T. Chen ◽  
P. E. Russell
Keyword(s):  
Surface Roughness ◽  
Scanning Tunneling Microscopy ◽  
Nonlinear Optical ◽  
Polymer Surface ◽  
Light Extinction ◽  
Scanning Tunneling ◽  
Silicon Substrates ◽  
Tunneling Microscopy ◽  
Optical Polymer ◽  
Total Light

Scanning tunneling microscopy (STM) has been used to characterize the surface roughness of nonlinear optical (NLO) polymers. A review of STM of polymer surfaces is included in this volume. The NLO polymers are instrumental in the development of electrooptical waveguide devices, the most fundamental of which is the modulator. The most common modulator design is the Mach Zehnder interferometer, in which the input light is split into two legs and then recombined into a common output within the two dimensional waveguide. A π phase retardation, resulting in total light extinction at the output of the interferometer, can be achieved by changing the refractive index of one leg with respect to the other using the electrooptic effect. For best device performance, it is essential that the NLO polymer exhibit minimal surface roughness in order to reduce light scattering. Scanning tunneling microscopy, with its high lateral and vertical resolution, is capable of quantifying the NLO polymer surface roughness induced by processing. Results are presented below in which STM was used to measure the surface roughness of films produced by spin-coating NLO-active polymers onto silicon substrates.

Surface roughness measurements of vanadium-contaminated fluidized cracking catalysts by atomic force microscopy

1996 ◽  
Vol 54 ◽  
pp. 866-867
Author(s):  
H. Kinney ◽  
M.L. Occelli ◽  
S.A.C. Gould
Keyword(s):  
Surface Roughness ◽  
Zeolite Y ◽  
Atomic Level ◽  
Microporous Structure ◽  
Contact Mode ◽  
Force Microscopy ◽  
Atomic Force ◽  
Before And After ◽  
Roughness Measurements ◽  
Cracking Catalysts

For this study we have used a contact mode atomic force microscope (AFM) to study to topography of fluidized cracking catalysts (FCC), before and after contamination with 5% vanadium. We selected the AFM because of its ability to well characterize the surface roughness of materials down to the atomic level. It is believed that the cracking in the FCCs occurs mainly on the catalysts top 10-15 μm suggesting that the surface corrugation could play a key role in the FCCs microactivity properties. To test this hypothesis, we chose vanadium as a contaminate because this metal is capable of irreversibly destroying the FCC crystallinity as well as it microporous structure. In addition, we wanted to examine the extent to which steaming affects the vanadium contaminated FCC. Using the AFM, we measured the surface roughness of FCCs, before and after contamination and after steaming.We obtained our FCC (GRZ-1) from Davison. The FCC is generated so that it contains and estimated 35% rare earth exchaged zeolite Y, 50% kaolin and 15% binder.

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