Current Nanoscience - Volume 8, Issue 3, 2012

The research presents an experimental study on the heat transfer and pressure drop characteristics of Al2O3-water nanofluids flowing through a microchannel heat sink (MCHS). The effects of Reynolds number and particle concentrations on the heat transfer and flow behavior are investigated. Comparison of the heat transfer coefficient obtained from water-cooled MCHS and nanofluids-cooled MCHS is also present Read More

Copper loaded nanostructure TiO2 thin films were deposited on glass substrates using the dip-coating method. The crystalline structure and surface morphology of Cu-loaded TiO2 thin film was characterized by X-ray diffraction analysis and Field emission scanning electron microscopy. X-ray photoelectron spectroscopy was used to evaluate the surface properties of the film surfaces. The transmittance spectra of the films wer Read More

This article addresses the flow of nanofluid towards a radially stretching sheet with convective boundary conditions. The Brownian motion and thermophoresis effects are taken into consideration. The governing equations are reduced to a system of coupled ordinary differential equations through similarity transformations. Analytic solutions valid for all the values of embedding parameters have been obtained by homotopy Read More

A simple thermal process for the one-step preparation of highly concentrated (up to 0.21 M) but well-stable silver colloids with a bimodal size distribution is developed for the first time, carried out by directly heating an aqueous solution of concentrated AgNO3 and poly[(2-ethyldimethylammonioethyl methacrylate ethyl sulfate)-co- (1-vinylpyrrolidone)] (PQ11), a kind of cationic polyelectrolyte, at 100 °C with Read More

A comparative study on the microstructure and magnetic properties of FePt-MgO and FePt-Ag thin film sputtered onto glass substrate has been carried out systematically in this paper. FePt-MgO thin film shows better (001) orientation of L10-ordered FePt phase, narrower c-axis orientation distribution, higher out-of-plane coercivity, higher remanence ratio and larger hysteresis slope α than the FePt-Ag thin film. The results o Read More

Intranasal administration is a non-invasive and effective way for the delivery of drugs to brain that circumvents the blood– brain barrier (BBB). Taking this into account it was planned to formulate a thermodynamically stable and infinite dilutable nanoemulsion (o/w) encapsulating Ropinirole (rop), an anti-Parkinson drug, using a surfactant in a minimum concentration that could improve its solubility, stability and intransnasal fl Read More

Water-soluble, highly fluorescent (FL) and very stable biopolymer-conjugated CdS quantum dots (QDs) were prepared via ligand exchange process of CdS-TG QDs with a biopolymer based ligand. The salep biosource polymer can attach to the surface of CdS QDs to yield quantum dots having great properties. To provide evidences for the occurrence of ligand exchange process, the prepared bioconjugate CdS nanocrystals wer Read More

Cu(0) metal nanoparticles were prepared inside p(2-acrylamido-2-methyl-1-propansulfonic acid) hydrogel networks. The p(2- acrylamido-2-methyl-1-propansulfonic acid)-Cu composites were used in the reduction of 4-nitrophenol and 2-nitrophenol, as model reactions in the presence of excess NaBH4, and showed excellent catalytic activity. The reduction rate of 4-nitrophenol with p(2- acrylamido-2-methyl-1-propansulfonic acid) Read More

In this article, dispersive Raman imaging microscopy was used in characterizing the structures of: Polyaniline (PAni), MgFe2O4, and PAni/MgFe2O4 nanocomposite designed in the form of core-shell, and is used also in explaining their electrical conductivity properties. MgFe2O4 nanoparticles have been incorporated into the PAni polymer for capping and stabilizing the ferrite nanoparticles, and for tailoring the polymer's proper Read More

The nanocomposites of chitosan and its derivatives with layered silicate have gained increasing attention since they showed many attracting properties. For the first time, the present study was carried out to investigate the intercalation of chitosan monomer (Dglucosamine hydrochloride, DGH) into organic rectorite (OREC). XRD, TEM, FTIR, 13C NMR, SEM and TGA were performed to characterize the microstructure, morph Read More

In this communication, we report on the preparation of Ag nanoparticle-decorated 2,4,6-tris (2-pyridyl)-1,3,5-triazine nanobelts (AgNP-TPTNBs) by mixing a AgNO3 aqueous solution and pre-formed TPTNBs with the aid of sodium hydroxide in the absence of any external reducing agent. The formation mechanism of AgNP-TPTNBs is discussed from the seed-mediated growth and considering the reduction potential of triazine a Read More

Mn3O4 Nanoparticles were synthesized from Mn(OAc)2 by hydrothermal method in water in the presence and absence of ionic liquids (ILs) as template for controlling the size and the shape of nanoparticles. In order to produce nanoparticles which are more similar and uniform in distribution and morphology, ionic liquids have been used. The ionic liquid [BMIm][Cl] caused more uniform nanoparticles as well as sma Read More

Yttria stabilized zirconia (YSZ) nanostructured and conventional coatings have been prepared by atmospheric plasma spraying (APS) on NiCoCrAlY-coated superalloy substrates. Bonding strength test was carried out based on the ASTM-C-633-01. To evaluate thermal insulation value of coatings, the thermal insulation capability test was designed and administered. Field emission scanning electron microscope (FESEM) and X-ray dif Read More

Nano-poly(3-methoxythiophene) (NPMOT) was electrochemically synthesized on an ITO surface in the ionic liquid 1-butyl-3- methyl-imidazolium tetrafluoroborate ([BMIM]BF4) by a potentiodynamic polymerization method. NPMOT was characterized by fourier- transform infrared spectroscopies (FTIR) and scanning electron microscopy (SEM). Spectroelectrochemistry and electrochromic properties of the NPMOT fil Read More

ZnO flower like and doubly pointed microneedles (DPNs) were prepared on Cu2O and glass substrates respectively via facile hydrothermal route. Cu2O substrate was prepared through thermal oxidation method from the Cu sheet. The structure and morphologies of ZnO microstructures were characterized by X-ray diffraction and scanning electron microscopy. The average size of flower-like structure was measured to be 2 μm Read More

Nano-sized cuprous oxide (nano-Cu2O) materials with different morphologies such as hollow spheres, two-dimensional (2D) sheets and octahedrons were synthesized using a simple hydrothermal method in a Cu-citrate complex solution by making small adjustments to the solution’s pH value under alkaline conditions. The morphology of the Cu2O was observed using scanning electron microscopy (SEM) and high resolution tra Read More

The nanoimprint process of (CH2)n polymer is studied using molecular dynamics (MD) simulations based on the finitely extensible non-linear elastic (FENE) potential. To consider the effect of the anti-adhesion layer, a self-assembled monolayer (SAM) was coated on a stamp and imprinted onto a specimen. The effects of the imprinting temperature, loading and unloading velocities, and aspect ratio of the stamp are evaluated in te Read More

The present work was aimed to develop, explore & compare the use of multifuctional nanoparticles (MNPs) (drug loaded) made of the conjugate poly (lactide-co-glycolide) (PLGA) - polyethylene glycol (PEG) & – folic acid with PLGA nanoparticles (NPs) (drug loaded) for targeting solid tumor. For that first optimum cytotoxic concentration of PLGA (polymer) and cisplatin (drug) were optimized through MTT assay. The optimum size Read More

In this work, the oxidation of styrene by anhydrous hydrogen peroxide as an environmental friendly oxidant on γ-aluminasupported VxOy nanoparticles catalysts was performed with the continuous adsorption of water by anhydrous MgSO4. This catalyst, with a surface area of 174 m2/g, showed good selectivity for benzaldehyde. Poor styrene conversion and benzaldehyde selectivity due to the presence of water ca Read More

Multi-walled carbon nanotubes (MWCNTs) prepared by chemical vapor deposition (CVD) were sprayed on C wafers. Then, an 8 nm-thick CNx coating was deposited on MWCNTs by ion beam deposition (IBAD). The cell adhesion and hemocompatibility of MWCNTs with and without CNx coating were investigated using contact-angle measurements, cell- and platelet-adhesion assays, and hemolytic-rate testing. The results showed that Read More