We have observed unusual ferromagnetic properties in single-crystalline CoSi nanowire ensemble, in marked contrast to the diamagnetic CoSi in bulk. High-density freestanding CoSi nanowires with B20 crystal structure are synthesized by a vapor-transport-based method. The reaction of cobalt chloride precursor with a Si substrate produces high-aspect-ratio CoSi nanowires. The high-resolution trans...

Iron-chalcogenide single crystals with the nominal composition FeSe0.5Te0.5 and a transition temperature of Tc�14.6 K were synthesized by the Bridgman method. The structural and anisotropic superconducting properties of those crystals were investigated by means of single crystal x-ray and neutron powder diffraction, superconducting quantum interference device and torque magnetometry, and muon-s...

in this research zinc oxide (zno) nano-crystalline powders were prepared by sol-gel method using zinc acetate. the zno nanoparticles were characterized by x-ray diffraction (xrd), scanning electron microscopy (sem), ultraviolet-visible (uv-vis), fourier transform infra-red (ft-ir) and energy dispersive x-ray (edx) spectroscopy. the structure of nanoparticles was studied using xrd pattern. the c...

The p-type crystalline silicon wafers have occupied most of the solar cell market today. However, modules made with n-type crystalline silicon wafers are actually the most efficient modules up to date. This is because the material properties offered by n-type crystalline silicon substrates are suitable for higher efficiencies. Properties such as the absence of boron-oxygen related defects and a...

The techniques of crystallization, developed in recent years, have permitted enzyme studies that are far more exact than were possible with the more crude preparations. Among the crystalline enzymes, Northrop’s pepsin has been the object of widespread and intensive research (1) which has contributed to the knowledge of enzyme action and mode of operation. In order to further the understanding o...

Proteolytic enzymes from plant tissues have in general resisted purification more successfully than those of animal origin. Proteinases have been extracted from many plants, among them yeast (9), pineapple (27), pumpkin (27), beans,’ and wheat (4), but much concentration and purification are usually required before a preparation of even moderate activity is obtained. This presents difficulties ...

Universidade Regional do Cariri, 63105-000 Crato-CE, Brazil Departamento de Física, Universidade Federal do Ceará, 60455-760 Fortaleza-CE, Brazil Faculdade de Ciências, Universidade Estadual Paulista, Bauru-SP, Brazil Instituto de Química, Universidade Estadual Paulista, PO Box 355, 14801-970 Araraquara-SP, Brazil Laboratório de Química do Estado Sólido, Instituto de Química, Universidade Estad...

biological systems provide many examples of specifically tailored, nanostructured molecules with highly optimized properties and characteristics. these biomaterials are composite materials and consist of an inorganic component and a special organic matrix. crystalline bacterial cell surface layers (s-layers( are the outermost cell envelope component of many eubacteria and archaea and are compos...