This work shows that Ostwald ripening, a universal mechanism responsible for the increase of crystal size during precipitation from solutions, can be meditated by ion diffusion through condensed monolayers of water connecting separated nanocrystals. In an environmental electron microscope we have observed “in-situ” the time evolution of the number, shape, size and crystallographic texture of Na...

modification of the mechanical properties of silicone rubber were considered for drug delivery systems by using high-energy electron beam (e-beam). in this research work, two different medical grades of silicone rubbers were used to prepare matrices containing 10wt% progesterone with 2 mm thickness and irradiated with e-beam at dose range of 25 up to 200 kgy. then, the mechanical properties as ...

Abstract The presence of a metallic layer can influence the properties high-temperature superconductors underneath. We investigate structures deposited in form nanoparticles or continuous layers by electron beam evaporation ion sputtering on Y1Ba2Cu3O7-x (YBCO) thin films. To generally avoid diffusion metal atoms an additional barrier is introduced. Detailed measurements magnetic moment superco...

We present a theoretical analysis of the evaporative cooling of a magnetically guided atomic beam by means of discrete radio-frequency antennas. First we derive the changes in flux and temperature, as well as in collision rate and phase-space density, for a single evaporation step. Next we show how the occurrence of collisions during the propagation between two successive antennas can be probed...

Abstract We describe here the design of modernized ion-optical system (IOS) standard residual gas analyzer (RGA). IOS electrodes are made stainless steel. The powered outside vacuum chamber. Reducing diameter entrance aperture to 0.6 mm it possible expand measurement range. These features this makes measure mass-to-charge composition beam plasma ions generated by electron evaporation ceramics a...

Carbon nanotubes (CNTs) and nanofibres (CNFs) are grown on bulk-micromachined silicon surfaces by thermal and plasma-enhanced chemical vapour deposition (PECVD), with catalyst deposition by electron beam evaporation or from a colloidal solution of cobalt nanoparticles. Growth on the peaked topography of plasma-etched silicon ‘micrograss’ supports, as well as on sidewalls of vertical structures ...

Achieving the highest possible resolution using scanning-electron-beam lithography (SEBL) has become an increasingly urgent problem in recent years, as advances in various nanotechnology applications have driven demand for feature sizes well into the sub-10-nm domain. While SEBL has the highest resolution of nearly any conventional patterning technique available, reliably defining features at t...