Nanoscience & Nanotechnology-Asia - Volume 2, Issue 1, 2012

A fundamental understanding of the physical and chemical properties of gold clusters, namely, the size dependence of these properties, is necessary for developing wide range of gold clusters’ applications. Having this purpose in mind, the structural and energetic properties, such as binding energies, relative stability and band gaps ΔEHL (HOMOLUMO gaps) are evaluated. The gold clusters in a wide range of sizes, Aun Read More

Zinc oxide (ZnO) is a wide-band gap IIb-I compound with wurtzite crystal structure, and possesses semiconducting, pyroelectric, piezoelectric, biosafe and biocompatible properties. With these unique characteristics, ZnO becomes one of the most important nanomaterials in scientific research and applications nowadays. The diversity of ZnO nanostructures gives the promising solution to many fields of nanotechnology Read More

In the present work, colon specific drug delivery systems have been selected, to deliver the drug locally to colon for longer period of time. Cross-linked guar gum microspheres of model drug secnidazole were prepared by emulsification method and were evaluated for size and surface morphology by SEM, encapsulation efficiency, yield, swelling study. In vitro drug-release studies were performed in conditions simulating Read More

Amphiphilic chitosan-graft-polylactide copolymers (CS-g-PLA) were synthesized via coupling reaction of monocarboxyl-ended polylactide with the amine group of chitosan in the presence of 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride and N-hydroxysuccinimide. The composition of CS-g-PLA copolymers was confirmed by 1H NMR and FTIR. Self-assembled micelles were prepared by direct dissolution o Read More

Particles with a nanoscale cubic structure, termed nano-cubes, in addition to nanoscale ball-shaped structures (nano-balls) were produced by electric arc discharge with a carbon electrode containing silicon, oxygen, sodium, and fluorine. The nano-cubes have a crystalline structure similar to the nano-balls. Two types of nano-cubes were produced by the electric arc discharge, the first composed only of silicon, and the seco Read More

The asymmetry porphyrin incorporates into mesoporous molecular sieves SBA-15 which through the reaction of the OH group of SBA-15 with the fluorine group of the porphyrin. The resultant material was characterized by means of XRD, TEM, solid UV/Vis, FTIR and nitrogen adsorption. Results indicate that the channels of SBA-15 have been filled with porphyrins. Luminescent property was studied by solid fluorescent emission a Read More

Porous TiO2-Al2O3 composites were prepared by sol-gel method using tetrabutyl titanate and aluminum isopropoxide as the sol precursors. PEG1000 was used as the pore forming template. The materials were composed of anatase TiO2 and amorphous Al2O3. Long grooves distributed on the rough surfaces of the materials. FT-IR and XPS spectra indicated that the samples were composed of TiO2 and Al2O3. The porou Read More

For ultimate commercialization of carbon nanotubes, a cheap catalyst, a simple and large scale synthesis method and a cheap carbon source are necessary for their preparation at low cost. Here, an alternative way of preparing multi walled carbon nanotubes (MWNTs) on a large scale with low cost using conventional hydrocarbon source i.e., liquefied petroleum gas as carbon precursor (LPG) is presented. MWNTs were synthesiz Read More