Film surface roughness

Fig. 7.10. Maximum, root mean square, and average roughness Amax, Rq, and fta, respectively (derived from 10 X 10 pm2 AFM scans) of 300 nm thick ZnMgO films (PLD from a ZnO 4wt. %MgO target) on a-plane sapphire in dependence on oxygen partial pressure during PLD growth. Lowest film surface roughness is obtained around 10 3 mbar. The lines are drawn to guide the eye. Measured by G. Zimmermann...

For TiAlSiN film, the wear did mainly not happen, regardless of the film surface roughness. While, the substrate was occurred by the severe wear. Thus, the wear of SKD61 was improved by the coating TiAlSiN film. 

Reduced surface tack protective film/surface roughness ... 

Allara has demonstrated, using transmission electron microscopy (TEM), that Au films produced with a cystamine adhesive were very smooth in the 5-10 nm range of film thickness (24). Electrical continuity was shown to be a function of crystallite size the films formed on the thiol surface exhibited smaller crystallites due to the inhibition of adatom diffusion by the anchoring agent. The roughness of the AI2O3 substrates was not considered in the discussion of Au film surface roughness (24), but certainly should affect the nature of the Au film. Limitations in the resolution of the electron microscopy used prevented characterization of such films less than 5 nm thick. 

Table 1. D-PP film surface roughness data from AFM... 

Thicknesses of the bulk and skin layers. Film surface roughness. 

In the context of the structural perturbations at fluid-solid interfaces, it is interesting to investigate the viscosity of thin liquid films. Eaily work on thin-film viscosity by Deijaguin and co-workers used a blow off technique to cause a liquid film to thin. This work showed elevated viscosities for some materials [98] and thin film viscosities lower than the bulk for others [99, 100]. Some controversial issues were raised particularly regarding surface roughness and contact angles in the experiments [101-103]. Entirely different types of data on clays caused Low [104] to conclude that the viscosity of interlayer water in clays is greater than that of bulk water. 

Optical Properties. Owing to the high crystallinity of HDPE, most thick-waHed articles made from HDPE resins are opaque. Significant surface roughness can also add to the opacity. Thin HDPE film, in contrast, is translucent, but its transparency is significantly lower than that of LDPE or LLDPE film. The ultraviolet transmission limit of HDPE is around 230 nm. 

Surface roughness effects in inorganic primer films... 

Medwell, J. O. and A. A. Nicol, Surface Roughness Effects on Condensate Films, ASME-AlChE Heat Trans. Conference and Exhibit, Los Angeles, California, Aug. (1965), Paper No. 65-HT-43. 

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