Current Nanoscience - Volume 9, Issue 5, 2013

Iron oxide nanomaterials have been gaining excessive importance because of their magnetic characteristics and wide applications. Iron oxides magnetic nanoparticles with appropriate surface chemistry are prepared either by wet chemical method such as colloid chemical or sol-gel methods or by dry processes such as vapor deposition techniques. Iron oxides in nano-scale have exhibited great potential for their appl Read More

Nanotechnology is essentially related with the synthesis of nanoparticles of varying size and shapes. With the search of environment- friendly protocols for the synthesis of nanoparticles a diverse group of biological agents have been emerged. These biological agents are safe, eco-friendly and lead to green synthesis of nanoparticles. The present review focuses on the role of biological agent(s) towards the development of Read More

Cerium oxide or ceria is an inorganic compound of Cerium, a rare earth element of lanthanide series. Due to the unique ability of cerium to switch oxidation states between +3 and +4 it has various applications as ultraviolet light absorbers, catalytic converters for automobile exhaust systems, solar cells, optics, oxygen sensors and other commercial and biomedical applications. Cerium oxide nanoparticles popularly known as na Read More

In this study, we developed poly(lactide)-poly(ethylene glycol) (PLA-PEG) blend nanoparticles with variable molecular PEG weights (2, 10, or 20 kDa) to encapsulate antifungal amphotericin B (AmB) and to evaluate its in vitro efficacy in strains of Candida sp. and in vitro cytotoxicity in human erythrocytes. The nanoparticles were prepared using an emulsification/solvent evaporation technique and were characterized with resp Read More

In the present work, magnetic nanoparticles coated with silica or ORMOSIL are prepared in a two step process. In the first step, SPIONs with 6 nm average diameter are produced by a reduction-precipitation process conducted in air and in the second one, SPIONs were used as seeds for silica/ORMOSIL growth (below 30 nm), in situ by a modified Stober sol-gel method. SPIONs and silica/ ORMOSIL magnetic core-shell nano Read More

Systematic investigations of magnetization behavior performed on planar arrays of 30 nm wide Fe-nanowires (NW) fabricated on oxidized step-bunched Si (111) templates reveal that the NW arrays exhibit an uniaxial anisotropy dominated by the shape of the wires, that facilitates in retaining the magnetization in-plane with easy axis parallel to the wires. The NWs possess polycrystalline character with bcc-crystal stru Read More

A low cast, full efficient and short term procedure for magnetization of carboxylated short multi-walled carbon nanotubes c- SMWCNTs was innovated in this work. Carboxylic acid groups were functionalized on SMWCNTs by refluxing in concentrated mixture of HNO3 and H2SO4 (1:3, v/v) solution. The remaining acid of the solution was neutralized by NaOH base until pH value reached 11 and then Fe3O4 nanoparticles wer Read More

Carbon Nanotubes (CNTs) are purified by Dynamic-oxidation (D-oxidation) technique to enhance the field emission behavior of CNT field emitters. In D-oxidation method, Carbon-type (C-type) impurities are removed out by selective oxidation by heating at constantly increasing temperature in air. It is observed that the turn-on voltage of D-oxidized CNTs is decreased from 4.4 V/μm to 3.6 V/μm, the current density is enhanced from Read More

Sudan dyes are toxic or carcinogenic even at low concentrations, which are illegally used as additives in food products to maintain their red color and thus stimulate sales of these products in the market recently. A facile adsorption procedure for the removal of Sudan I and II in n-hexane using oxidized multi-walled carbon nanotubes (O-MWCNTs) is presented in this paper. The effect of absorption conditions including absorption t Read More

In this paper, multi-walled carbon nanotubes (MWCNTs) were oxidized by 30 w% hydrogen peroxide to introduce hydroxyl groups and carboxyl groups on it. Catalyzed by p-toluenesulfonic acid, D-tartaric acid (DTA) was grafted onto MWCNTs by an esterification reaction. Fourier transform infrared spectroscopy and high resolution transmission electron microscopy were used to elucidate the introduced groups and the morp Read More

We demonstrate a method to fabricate flexible field effect transistors based on mask-free inkjet printed silver micro-electrodes and wet-transfer of chemical vapor deposition grown graphene. The process is simple, low-cost and repeatable. The transistor shows a field-effect hole mobility of 33 cm2/Vs and on/off ratio of 2.1 with high drain current of 54 mA, which is the highest reported in air at room temperature.

The objective of this paper is to provide a systematic investigation on design or evaluation for W/Al interface structure in micro/ nano electronic manufacturing. To understand the basic mechanical properties of the W/Al interface structure, the elastic modulus and the hardness of the sample were investigated by nanoindentation. To investigate the integrating characteristics of the sample in progress, the effect of thermal loadi Read More

Vildagliptin-loaded mucoadhesive nanoparticles using Carbopol 934 P (CVN) as mucoadhesive polymer were prepared by Buchi Nano Spray Dryer to retain the drug in the stomach for a prolonged period of time and to provide sustainable release. The morphological properties of the nanoparticles were studied by scanning electron microscopy and found to have smoother surface with shriveled shape. Drug loading an Read More

In this investigation anelectrospunsulfonated poly(ethylene terephthalate) (SPET) nanofibrous mat was prepared by electrospinning of the SPET solution in trifluoroaceticacid (TFA)/dichloromethane (DCM) mixture. The produced nanofibers had average diameter of 133nm. The performance of the aforementioned membrane for removal ofFe3+,Mg2+ and Ca2+under different conditions of applied pH and pressure wasstudied Read More

The present work aims at optimizing the nano size of the particles of γ-alumina to generate micro- and meso-porous structures and improve the efficiency of dehydrogenation catalysts. Following this trend, two different kinds of γ-alumina were prepared using low and high concentration of cetyl tri-methyl ammonium bromide surfactant (CTAB). Both kinds of alumina were characterized by XRD, TG, DTA, SEM and TEM in addi Read More

According to the self-similarity of powder particle breakage, multi fractal model which could simulate the process of powder particle breakage and aggregation has been built and also has been discussed the simulation process by using methods of number theory and matrix. The comparative analysis of the simulation results and the statistical results, shows that the multi fractal model can be used to accurately describe the br Read More

CdS hollow nanospheres with enhanced photocatalytic performance have been prepared by employing SiO2 nanospheres as templates with a simple and mild solution reaction at room temperature. Field emission scanning electron microscopy (FESEM) and high resolution transmission electron microscopy (HRTEM) analyses confirmed that these CdS hollow nanospheres possess 370 nm diameter and the wall thickness l Read More

The thermal boundary layer of nanofluids over an unsteady stretching sheet with a convective surface boundary condition is investigated. Two types of water based Newtonian nanofluids containing metallic or nonmetallic nanoparticles such as Copper (Cu) and Alumina (Al2O3) are considered from a theoretical viewpoint and for a range of nanoparticle volume fractions. Using a similarity transformation the governin Read More

PVDF-based nanocomposites with insulating BaTiO3, semiconducting SiC and conducting graphite nanoplatelets (GNPs) and with hybridization of these nanofillers were fabricated by simple solution mixing and compression molding. The electrical properties of such composite materials were characterized using AC impedance spectroscopy with frequencies ranging from 50 to 5x106 Hz. The results showed that the solution mi Read More

There remains a great need for improved imaging technology in oncology both for screening, localization, and to follow the progress of treatments. With the exception of gadolinium, which has a history of use in MRI, other rare earth elements have been largely under-used for in vivo imaging. The unique properties of this class of elements are described and the possibilities for their application in cancer imaging illustrated. Furt Read More