The synthesis of NANOstructures cobalt through a controlled chemical process followed by heat treating at various temperatures is studied. The product is characterized by ICP, XRD, FESEM, and TEM, indicating that the as- synthesized particles have an amorphous structure with 1.76 for Co/B ratio, an average size of 50 nm. The transformation of intermediate phases into single phase NANOcrystalline metallic cobalt during the heat treatment is investigated by DSC analysis. The mean crystallite size of obtained cobalt was 30 nm. The decrease in coercivity (4344.93A/mf) with the sharp increase in saturation magnetization (1.41×10-4 Am2/kg) presents excellent ferromagnetic properties for NANO- crystallite cobalt.

Background: b-Cyclodextrin functionalized hyper-branched polyglycerol (HBCD: b-CD-g-PG), a biocompatible polymer, has recently been proposed for delivery of poorly water soluble compounds.Methods: The present study examines the interaction of HBCD with RNA, utilizing a constant concentration of RNA and different HBCD/RNA ratios of 1.16 to 1.1, at physiological condition in an aqueous solution. Circular Dichroism (CD), UV-visible, FTIR spectroscopic methods, zeta potential and Dynamic Light Scattering (DLS) were used to analyze the particle formation, particle charge, particle size, aggregation, RNA conformation, binding constant and mode, and the effect of polymer complexation on RNA stability.Results: The results indicate that the interaction of RNA with HBCD leads to the formation of a linear dendritic supramolecule biopolymer with an overall binding constant of KHBCD/RNA=1.25 ´ 103.Conclusion: The small sized synthesized polymer can be considered as an appropriate system for preventing RNA aggregation and protecting the gene by host-guest interaction.

In this paper, polycrystalline pure zinc oxide NANO STRUCTURED thin films were deposited on two kinds of single crystal and polycrystalline of p and n type Si in three different substrate temperatures of 300, 400 and 500◦C by low cost APCVD method. Structural, electrical and optical properties of these thin films were characterized by X ray diffraction, two point probe method and UV visible spectrophotometer respectively. IV measurements of these heterojunctions showed that turn on voltage and series resistance will increase with increasing substrate temperature in polycrystalline Si, while in single crystal Si, turn on voltage will decrease. Although they are acceptable diodes, their efficiency as a heterojunction solar cell are so low.

NANO-STRUCTURED lanthanum strontium cobalt ferrite, La0.6Sr0.4Co0.2Fe0.8O3 (LSCF), was successfully synthesized via co-precipitation method using metal nitrates as starting MATERIALs. Effects of precipitating agent and calcination temperature on the phase composition and morphology of synthesized powders were systematically studied using X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM), respectively. XRD analysis revealed that a single phase La0.6Sr0.4Co0.2Fe0.8O3 perovskite was obtained in the processed sample using ammonium carbonate as precipitating agent with a NH4+/NO3-molar ratio of 2 after calcination at 1000oC for 1 h. The phase composition of products was also affected by changing pH values. Moreover, using sodium hydroxide as a precipitant resulted in a mixture of La0.6Sr0.4Co0.2Fe0.8O3 and cobalt ferrite (CoFe2O4) phases. Careless washing of the precursors can also led to the formation of mixed phase after calcination of final powders. Mean crystallite size of the obtained powders was not noticeably affected by varying calcination temperature from 900 to 1050oC and remained almost the same at 10 nm, however increasing calcination temperature to 1100oC resulted in sharp structural coarsening. FESEM studies demonstrate that relatively uniform particles with mean particle size of 90 nm were obtained in the sample processed with a NH4+/NO3- molar ratio of 2 after calcination at 1000oC for 1 h.

Copper oxide NANOparticles were prepared and subsequently deposited onto the surface of cotton fiber by ultrasonic irradiation. The structure and morphology of the coated and un-coated cottons were examined by XRD and SEM/EDX analysis. These methods revealed that CuO NANOparticles are crystalline and corresponds to the monoclinic phase, and that these NANOparticles are physically adsorbed onto the cotton fiber surface. They have an average size of 10 nm, and the physical and chemical properties of the treated cotton fibers are markedly different from those of the untreated cotton fibers. The CuO-cotton fiber NANO-composite tested against Escherichia coli (Gram negative) and Staphylococcus aureus (Gram positive) cultures showed a significant antimicrobial activity, whereas its analogous CuS-coated cotton MATERIAL formed by the reaction CuO coated cotton fibers with H2S, showed no activity.