Current Nanoscience - Volume 6, Issue 2, 2010

The combination of patterning techniques, such as scanning probe based lithography, with the “grafting from” approach of polymer brushes opens the possibility to create structured functional substrates for the fabrication of sensors, electronic devices and others. The use of the surface-initiated ring-opening polymerization furthermore allows the introduction of biodegradable and technologically relevant polymer system Read More

Investigations on gas adsorption in nanostructures are important for potential applications such as fuel cell, gas sensor, hydrogen storage etc. Of all nanomaterials, carbon (CNTs) and boron nitride nanotubes (BNNTs) are analyzed widely, since they are porous, having large surface area and high thermal stability. It is interesting to note that while CNTs exhibit both semiconducting and metallic behaviour, BNNTs show only semicond Read More

The hyper Wiener index of a molecular graph is defined as one half of the sum of the distances and square distances between all (unordered) pairs of vertices of the graph. In this paper we find an exact formula for calculation of the hyper Wiener index of nanotubes which have square and octagon structure and denoted by C4C8(S) nanotubes.

The development of carbon nanotubes (CNTs) for biomedical and biotechnological applications has gained great promise recently, especially for their interesting use in the delivery of therapeutically active molecules to targeted cells. The interaction between cells and this nanomaterial is a critical feature that is responsible for the pharmacological effect as well as for any eventual toxicity. With respect to the latter aspect, in Read More

The pentagonal carbon nanocones are constructed from a graphene sheet by removing a 60 ° wedge and joining the edges produces a cone with a single pentagonal defect at the apex. In this paper, the Wiener indices of these nanocones are computed generally by a new graph theoretical method, for the first time. We prove that our method is general and it is possible to apply for other nanostructures.

The rheological and electrical properties of suspensions of carbon nanotubes in an uncured epoxy resin were investigated by means of shear rheology and impedance spectroscopy. It was found that above an onset CNT weight fraction (0.1 wt%), the steady viscosity increased with CNT loading and presented a shear thinning behaviour. The concentration dependence of viscosity changed from a power law to an exponen Read More

CuS nanocrystals in hexagonal structure have been synthesized by mechanical alloying the elemental Cu and S powders. CuS compound was formed through the reaction of Cu + S → CuS, which was initiated only 100 seconds after the mechanical alloying process started. XRD pattern suggests that pure CuS nanocrystals in hexagonal structure were obtained after mechanical alloying process was carried out for 40 hou Read More

A ferromagnet-metal composite, La0.9Sr0.1MnO3-Pt (nano-crystal)-La0.9Sr0.1MnO3, was executed by r.f. magnetron sputtering deposition. It was clearly shown that the metallic Pt nano-crystals were formed in the La0.9Sr0.1MnO3 (LSMO) matrix. The decrease of Curie temperature by the introduction of Pt nano-crystals into LSMO thin films was observed, which was attributed to the induction of the magnetic inhomogeneity Read More

Nanomechanical response of indented aluminum/titanium (Al/Ti) multilayered films were characterized using an Auger electron spectrometer, focused ion beam (FIB) machining, and transmission electron microscopy (TEM). The pure and multilayered films on Si(100) substrates were prepared using the radio frequency magnetron sputtering process. The empirical Hall-Petch relationship and its reverse effect on nanoin Read More

In this study, a cell labelling method is presented using biocompatible europium doped hydroxyapatite (Eu-HAP) inorganic nanoparticles. Eu-HAP nanoparticles were successfully prepared by precipitation method and utilized to label Bel-7402 human liver cancer cells as fluorescent probe. After Eu-HAP nanoparticles were internalized by cells, the strong green fluorescence and the red fluorescence were observed with excitation Read More

Nanoemulsions/microemulsions are thermodynamically stable transparent (translucent) isotropic dispersions of oil and water stabilized by an interfacial film of surfactant and cosurfactant molecules having the droplet size of less than 100 nm. Because of their thermodynamic stability, they can be manufactured without utilizing high input of energy. In an attempt to enhance transdermal/topical drug delivery of anti-inflamma Read More

Synthesis of new generation of agrochemicals of phenoxyherbicides-type, namely 2-chloro- (2CPA) and 2,4,5- trichlorophenoxy acetates (TCPA) were accomplished by hybridization of the phenoxyherbicides into zinc-aluminium-layered double hydroxide interlamellae for the formation of new nanohybrids of 2CPA and TCPA, labeled as N2CPA and NTCPA, respectively. Basal spacing expansion from 8.9 Å in the layered double hyd Read More

We report the construction of titania contained opal and inverse opal structures by using colloidal crystals as templates which were self assembled from poly(allylamine hydrochloride) (PAH)/poly(acrylic acid) (PAA) multilayer film coated polystyrene (PS) particles. By infiltrating a titania precursor titanium (IV) bis (ammonium lactato) dihydroxide (TALH) into the polyelectrolyte (PE) multilayer film followed by calcination at different t Read More

Zinc nitrate precipitated with NaOH solution under double-jet conditions produced uniform nanostructured zinc oxide particles containing stacked nanoplates at 80 °C in the presence of starch sodium octenyl succinate (SSOS). In the absence of SSOS, nonuniform agglomerated ZnO particles and hexagonal nanorods were obtained. The presence of SSOS provided important hints on particle formation and confirmed that subm Read More

A thorough understanding of the electrical transport behavior of large-area and nano-scale contact devices employing thin film homo- or hetero-junctions is critical to designing and fabricating high-performance optoelectronic devices. We investigate and discuss the electrical transport properties of ZnO diodes measured on macroscopic and nano-scale contacts based on current understanding of the field. The ZnO thin Read More

A common challenge in the X-ray nanotomography of porous media, such as fuel cell gas diffusion layers (GDLs), is to binarize nanotomography greyscale images in order to differentiate between solids and voids for structural characterisation and numerical flow analysis. In the process threshold determination is critical. This paper presents a study on determination of and fine-tuning threshold value based on compariso Read More