Selective wetting in a hydrocarbon liquid-perfluorocarbon liquid-solid system

Selective (displacement) wetting is, for the first time, investigated in a hydrocarbon liquid-perfluorocarbon liquid-fluorinated polyethylene system. Contact angles upon the selective wetting are shown to be quite sensitive to the presence of fluorocarbon groups on the surface of the polymer, and wetting inversion takes place when the surface concentration of fluorine is increased above 10^?4 kg/m².     

Size Effect and Processes of Interdiffusion in Multilayer Films

The electrophysical properties of multilayer structures consisting of the alternate Co and Ni layers or Co and Cr layers obtained in high vacuum (˜ 10⁻³ Pa) were investigated. The size dependences of the temperature coefficient of the resistance (TCR) of the films were obtained experimentally and then compared with the R. Dimmich theoretical model. The analysis shows that the main reason of the difference between theoretical and experimental data of TCR is the interdiffusion of atoms from one layer to another.     

Determination of the Bone Mineral Crystallite Size and Lattice Strain from Diffraction Line Broadening

Diffraction line broadening observed for the biological apatite is ascribed to small crystallite dimensions and lattice imperfections. However, it is rather difficult to separate the individual contribution of each factor. Therefore in numerous works a total inverse width of a diffraction peak is only used as a size/strain parameter. Several authors determine the bioapatite crystallite size ignoring the lattice strain. As is shown in the present paper, this problem can be resolved for oriented specimens. The crystallite size and lattice strain were calculated by two independent methods: Fourier analysis and approximation with threefold convolution of X‐ray lines. The approach proposed can be useful in the investigations into structural aspects of the bone apatite and its synthetic analogues as the crystal size is related to surface defects and the lattice strain to lattice imperfections.