Current Nanoscience - Volume 6, Issue 1, 2010

During the last decade there has been a growing attention to nanoscaled materials and to the related technologies to produce them. The problems to overcome in the manufacturing of these kinds of items increase dramatically on decreasing the dimension of the devices. In this sense, the scientific research has been strongly stimulated to try to improve and optimize all the critical issues. One of the most attractive fields in Read More

Carbon nanotubes represent one of the most important materials in nanoscience and nanotechnology today. The exceptional properties that these materials possess open new fields in science and engineering. Additionally, the chemistryassociated to these materials starts to play an important role, inasmuch, new moieties insert by different chemical routes, inside and outside of carbon nanotubes surfaces, have shown able to Read More

Polymer-ceramic composites having polyvinylidene fluoride (PVDF) matrix filled with nanocrystalline barium titanate (BT) and multiwalled carbon nanotubes (MWNTs) were prepared by sonicated solution mixing method. The dielectric permittivity and electrical conductivity of such hybrids were measured over a wide range of frequencies. The results showed that the dielectric permittivity of PVDF/BT 50/50 composite at room te Read More

In this work, ZnO nanostructures synthesized by thermal evaporation of zinc oxide (ZnO) and carbon nanotubes (CNTs) on silicon substrate with sputtered Ag catalyst on are investigated. The multi-wall CNT powder made by chemical vapor deposition was mixed with ZnO powder with a ratio of 1:1 by mole. The mixture was then evaporated under argon flow in a horizontal tube furnace with source temperature of 950 C. Struc Read More

An easy strategy was developed for the water-soluble multi-walled carbon nanotubes (MWCNTs) without the length cutting of MWCNTs via the ultrasonic-assisted chemical functionalization with a redox couple ammonium persulfate/diethanolamine at room temperature. The Fourier transform infrared spectroscopy, Raman and X-ray photoelectron spectroscopy analysis of the functionalized MWCNTs conclusively show Read More

In situ chemical polymerization is used to prepare composites of multiwalled carbon nanotubes (MWCNTs) that are either wrapped with polyaniline (PANI) (MWP), or with perpendicular aligned PANI (MAP). Systematic study of morphology, composition, structure, thermal stability, and electrical properties is performed as a function of temperature to understand the composite formation. Orientation of PANI chains and the directi Read More

Development and progression of breast cancer can be caused by increased estradiol activity, which stimulates cell proliferation. Inhibitors of type 1 17β-hydroxysteroid dehydrogenase (17β-HSD) enzyme inhibit estradiol biosynthesis and therefore have potential anticancer activity. In this study two new trans-cinnamic acid esters were established as inhibitors of the human recombinant type 1 17β-HSD enzyme. Studied compoun Read More

Using a surfactant-mediated method, nanocrystalline titanium dioxide with a high BET surface area was generated within the template of the nonionic surfactant micelle assembly from the anhydrous metal chloride, TiCl4. The results indicate that the block copolymer can control the particle size and inhibit the agglomeration of anatase titanium dioxide in the calcining process, and simultaneously enhance phase trans Read More

Novel layered organic-inorganic hybrid materials consist of molybdenum oxide have been synthesized using three aminohydroxy ligands; diethylenetriamine, 2-(2-aminoethoxy) ethanol and 2-(2-aminoethylamino) ethanol. Different analysis methods have been utilized for understanding of the bonding nature between the organic and inorganic components and how the insertion of organic groups affects the structure of t Read More

Present study describes a simultaneous and highly reproducible, large-scale, one-pot, template free synthesis of nearly homogeneous and blue luminescent CdSe nanoparticles (NPs) in a single reaction at 50°C by wet chemical method. The method is simple, inexpensive and ensures almost complete utilization of the precursors. The product was well characterized by X-ray diffraction, UV-Vis. spectroscopy, Fourier transform i Read More

Zn1–xCdxS Nanoparticles with varying Cd concentration were synthesized via co-precipitation technique at 280 K. Despite the analogous size, the nanoparticles with different Cd content exhibit composition-dependent absorption resulting from the distinguished band gap. Due to size effect Zn1–xCdxS nanoparticles, self activated PL band shifted to higher energies compared to the absorption band of bulk counterpart. Origin of th Read More

Though it has been established that ZnO tetrapods can be synthesized by heating Zn in air, it is advantageous to grow tetrapods with legs of different morphologies with different lengths. Here, we report the large scale synthesis of ZnO tetrapods by heating Zn in air ambient. The parameters that control the diameter, length, and morphology of tetrapods are identified. It is shown that the morphology and dimensio Read More

Recent theoretical progress in understanding the effect of noble metal nanoparticles on the luminescent properties of europium complex was reviewed. The observed enhancement fluorescence results from surface-enhanced fluorescence (SEF) based on the surface plasmon resonance (SPR) of noble metal nanoparticles. And the observed quenching fluorescence is attributed to the re-absorption of surface plasmon reso Read More

Hydrothermal conversion of Degussa P25 into pure rutile has been investigated at 180°C under acidic conditions. Detailed characterizations of the hydrothermal products were achieved via XRD, TEM, BET, Raman scattering, and UV-vis absorption spectroscopy. The results show that the conversion process is a zero order reaction with a constant anatase conversion rate of ∼1.469 wt%/h. The existent ∼17.9 wt% of rutile i Read More

Stochastic parameters of self–agglomerated metallic nanoparticles on a dielectric film surface were studied using atomic force microscopy (AFM) analysis. In this regard, the rough surfaces including the nanoparticles were analyzed and characterized using structure function, roughness exponent and power spectrum density of the AFM profiles and their gradients, for different metal concentrations and heat treatment te Read More