This paper presents results of porous Sic characterization using photoluminescence, Raman scattering and Atomic Force Microscopy. A comparative optical spectroscopy study on bulk Sic and porous Sic layers has shown a number of new features specific to nano-crystallite materials. The role of these effects on optical spectroscopy data in porous Sic accessed by photoluminescence and Raman scatteri...

Nanodiamond crystals containing single color centers have been grown by chemical vapor deposition (CVD). The fluorescence from individual crystallites was directly correlated with crystallite size using a combined atomic force and scanning confocal fluorescence microscope. Under the conditions employed, the optimal size for single optically active nitrogen-vacancy (NV) center incorporation was ...

Crystallization behavior of melt-blended polypropylene (PP)/single wall carbon nanotube (SWNT) composites has been studied using optical microscopy and differential scanning calorimetry. Polypropylene containing 0.8 wt% SWNT exhibits faster crystallization rate as compared to pure polypropylene. PP/SWNT fibers have been spun using typical polypropylene melt spinning conditions. The PP crystalli...

TiO 2 was prepared by the homogeneous hydrolysis precipitation method from titanium tetraisopropoxide. The decrease of surface area observed with the thermal treatment can be related to the growth of crystallites, and there is good correlation between the surface area and the mean crystallite dimension. The coexistence of the three different crystalline TiO 2 phases is clearly evidenced by the ...

The wetting behaviour of methane on graphite has been studied by means of low energy electron diffraction and reflection high energy electron diffraction in the temperature range 14-40 K. Incomplete wetting, or crystallite formation, is detected over the entire temperature range for films with thicknesses of 15 or more layers. Isosteric heats of adsorption are reported for the 2nd, 3rd and 4th ...

The diffraction profiles of a thin single crystal with stacking faults were calculated with the theory of diffraction of a one-dimensionally disordered crystal (Kakinoki, Komura, Allegra) by including the effect of crystallite thickness. The results hold for generalized close packed structures. An application to calcium hydroxide is discussed: the stacking faults significantly contribute to the...

The temperature dependence of the crystallite nucleation and growth rates is measured for amorphous NiTi thin films. Using transmission electron microscopy, crystallites are shown to nucleate homogeneously in the film and to grow in a channeling mode. A mechanism that suppresses heterogeneous nucleation is proposed. By manipulating nucleation and growth rates, grains as large as 60 lm can be ob...