Role of surface roughness

Understanding the role of surface roughness in mixed lubrication is a first step toward the microscopic study of tribology. It has been an effort for more than 30 years, starting from statistic models, but it is the deterministic approach that provides a powerful means to explore the tribological events occurring at the micrometre scale. 

Schultz G, Janik-Czachor M, Van Duyne RP (1981) Surface enhanced Raman spectroscopy a re-examination of the role of surface roughness and electrochemical anodization. Surf Sci 104 419 34... 

Plenary 13. Andreas Otto, e-mail address otto ,rz.uni-duesseldorf.de (SERS). A survey of problems and models that underlie the SERS effect, now two decades old. Understanding the role of surface roughness in the enhancement. 

There are limitations to this model, however. Notably, these equations assume that the colloid surfaces are ideal—absolutely smooth and flat, completely homogeneous, and isotropic. In reality, surfaces are rather rough and chemically heterogeneous [54]. Such surfaces are difficult to achieve the only representative surfaces are carefully cleaved mica and perfect crystals. The role of surface roughness is discussed later. 

It remains to be seen whether the phenomenon of clouding in phase separation in microemulsions can also be described by these models. The role of surface roughness of the micelles in the phenomenon of clouding needs to be delineated by both experiments and theory. 

Mills, G., Gordon, M.S. and Metiu, H. (2003) Oxygen adsorption on Au clusters and a rough Au(lll) surface The role of surface flatness, electron confinement, excess electrons, and band gap. Journal of Chemical Physics, 118, 4198-4205. 

The experiments reveal that under wet conditions ka(Ra) since it has also been shown that oyer the range of surface roughnesses considered Ra a(tan0) (Glllis ( )) or Ra a(tan9) (Dlab ( 5)), it seems probable that if the mean slope of the counterface surface asperities plays an important role in the wear process. It will have a significant effect upon (k). 

Kerner, Z, and T, Pajkossy, Impedance of rough capacitive electrodes the role of surface disorder. Journal of Electroanalytical Chemistry, 1998. 448 pp. 139-142 Ldng, G, and K.E, Heusler, Remarks of the energetics of interfaces exhibiting constant phase element behaviour. Journal of Electroanalytical Chemistry, 1998. 457 pp, 257-260 Liu, S.H, Eractal model for the ac response of a rough interface. Physical Review Letters, 1985, 55 pp, 529-532... 

Khang D, Kim SY, Liu-Snyder P, Palmore GT, Durbin SM, Webster TJ. Enhanced fi-bronectin adsorption on carbon nanotube/poly(carbonate) urethane independent role of surface nano-roughness and associated surface energy. Biomaterials 2007 28 4756-68. 

A number of questions concerning the thermal oxidation still remain unanswered, including the problem of transport of charged and neutral oxidants, the formation of structural defects at the Si-Si02 interface, and the role of surface states [2, 5, 7, 8], The Si oxidation process depends on several factors, such as the crystallographic structure at the surface, the type and level of doping in the substrate, the nature of defects, and the surface roughness [2]. 

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