Surface energy solvent cleaning

Subsequently, the scan size is increased as much as is required to image the entire crystal. Then a FV scan is started using a z ramp rate of > a few Hz. An array of 64 x 64 points2 (4,096 consecutive force-distance measurements) is acquired to provide an FV image of the hydrophobic PE crystal on the more hydrophilic mica. Because of the high surface energy of (clean) mica and the sample preparation procedure, which involves hydrophobic solvents, the mica surface will be covered with a thin contamination layer. Nevertheless, the adhesive properties differ markedly and the crystal can be visualized as shown in Fig. 4.6b. This FV image is scaled... 

With thermal or solvent welding, snrface preparation is not as critical as with adhesive bonding. However, some form of surface pretreatment may still be necessary, although difficult chemical or physical treatments to increase the surface energy are not required. Certainly, the parts should be clean, and aU mold release and contaminants must be removed by standard cleaning procedures. 

Water (H2O) (cleaning) A common cleaning solvent used for removing ionic contaminants and as a rinsing agent. Often used as a water-alcohol mixture to lower the surface energy of the fluid. 

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