Surface pinning

Fig.23. Schematic illustration of wetting geometries expected for ultra-thin films of diblock copolymers a - parallel lamellae, b - surface (pinned) micelles, c - perpendicular lamellae. L corresponds to the equilibrium period of the lamellar morphology...

M C Derjonqueres, D Spanjaard Concepts m Surface Pin su s. Springer Senes in Surface Science Vol 30, Springer, Heidelberg 1993... 

PEt pins macroporous PSty grafted PEt (Figures 2c and d) grafted surface, pin-like shape [64.65]... 

Ejector-return pin (return pin, surface pin, safety pin, and position pushback) n, A projection, usually one of several that push back the ejector assembly as the mold closes. 

Fig. 13.8. a AP radiograph suggest the screws are ciose to the edge of the epiphysis, b Axial CT showing screw fixation abutting the cortical surface. Pin placement is too close to the joint surface and so were withdrawn slightly... 

A. Ejector nues and Pins. Ejector pins are countersunk into the ejector plate. The pins extend through the mold to the core or cavity molding surface. Pins are made from a high chrome vanadium or nitriding steel. The ejector plate also contains four push-back pins. These push the ejector plate to its back position when the mold closes so that the ejector pins and cavities are not damaged. 

Mechanical property measurements of films on substrates are made using the beam deflection techniques discussed under stress measurement except that the beam is loaded with known weights and the deflection is measured with the stress as the known.[ l Measurements can oidy be made as long as the film does not microcrack (tension) or bhster (compression). ] Thin films have been shown to have very high elastic modulus and strength, presumably due to surface pinning of mobile defects (dislocations). An indentation test may be used to determine the elastic properties of coatings. ... 

---