Current Issue : October - December Volume : 2014 Issue Number : 4 Articles : 6 Articles
Varieties of methods are established in the field of nanotechnology for development of ecofriendly and reliable process for the synthesis of gold/silver nanomaterials using different biological agent. The focal point of the present investigation is to synthesize the gold nanoparticle in a single, easy and extracellular synthesis step. Therefore, we used mung bean seed soaked water to reduce the aqueous gold ions into gold nanoparticles and the entire synthesis method was observed by UV-visible spectroscopy. The zeta potential measurement was employed to assess the stability of the synthesized gold nanoparticles. Further, the atomic force microscopy was employed to the characteristic features of gold nanoparticles size (50-120 nm), morphology and agglomeration of gold. Results indicate the synthesis of gold nanoparticles in the reaction mixture....
Propagation of surface plasmon polaritons (SPPs) along the interface between a metal and a dielectric has attracted significant\nattention due to its unique optical properties, which has inspired a plethora of fascinating applications in photonics and\noptoelectronics. However, SPPs suffer from large attenuation because of the ohmic losses in the metal layer. It has become the\nmain bottom-neck problem for the development of high performance plasmonic devices. This limitation can be overcome by\nproviding the material adjacent to the metal with optical gain. In this paper, a review of gain compensation to SPPs is presented.\nWe focus on the spontaneous radiation amplification and simulated radiation amplification. The ohmic loss of metal was greatly\nimproved by introducing optical gain. Then we introduce several gain mediums of dye doped, quantum dots, erbium ion, and\nsemiconductor to compensate optical loss of SPPs. Using gain medium mentioned above can compensate losses and achieve many\npotential applications, for example, laser, amplifier, and LRSPP discussed....
This paper presents the experimental investigation of copper loaded carbon nanotubes (CNTs) electrocatalysts for the\nelectrochemical reduction of carbon dioxide. The electrocatalysts were synthesized by homogeneous deposition precipitation\nmethod (HDP) using urea as precipitating agent. The prepared catalysts were characterized by TEM, SEM, XRD, XPS, BET, and\nFTIR for their morphology and structure. Characterization results confirm the deposition of Cu nanoparticles (3ââ?¬â??60 nm) on\nCNTs. Linear sweep voltammetry (LSV) and chronoamperometry (CA) were used to investigate the activity of the as-prepared\ncatalysts for the electrochemical reduction of carbon dioxide. The electrocatalysts reduced CO2 with high current density in\nthe potential range 0??3V versus SCE (standard calomel electrode). Among all catalysts tested, 20 wt. % copper loaded CNTs\nshowed maximum activity. Gas chromatograph with TCD was used to analyze liquid phase composition. The faradaic efficiency\nfor methanol formation was estimated to be 38.5%....
Carbon nanotubes (CNTs) and graphene were used as reinforcing fillers in nylon 6,6 in order to obtain nanocomposites by\nusing an injection moulding process. The two differently structured nanofillers were used in their pristine or reduced form, after\noxidation treatment and after amino functionalisation. Three low nanofiller contents were employed. Crystallisation behaviour and\nperfection of nylon 6,6 crystals were determined by differential scanning calorimetry and wide angle X-ray diffraction, respectively.\nCrystallinity was slightly enhanced in most samples as the content of the nanofillers was increased. The dimensionality of the\nmaterials was found to provide different interfaces and therefore different features in the nylon 6,6 crystal growth resulting in\nimproved crystal perfection. Dynamical, mechanical analysis showed the maximum increases provided by the two nanostructures\ncorrespond to the addition of 0.1 wt.% amino functionalised CNTs, enhancing in 30% the storage modulus and the incorporation\nof 0.5 wt.% of graphene oxide caused an increase of 44% in this property. The latter also provided better thermal stability when\ncompared to pure nylon 6,6 under inert conditions. The superior properties of graphene nanocomposites were attributed to the\nlarger surface area of the two-dimensional graphene compared to the one-dimensional CNTs....
Theresults of carbon-doped zinc oxide nanoparticles synthesized by CO2 microwave plasma at atmospheric pressure are presented.\nThe2.45-GHz microwave plasma torch and feeder for injecting Zn granules are used in the synthesis of zinc oxide nanoparticles.The\nZn granules (13.5 g/min) were introduced into the microwave plasma by CO2 (5 l/min) swirl gas. The microwave power delivered\nto the CO2 microwave plasma was 1 kW. The synthesis of carbon-doped zinc oxide nanoparticles was carried out in accordance\nwith CO2 +Zn ? carbon-doped ZnO + CO. The synthesized carbon-doped zinc oxide nanoparticles have a high purity hexagonal\nphase. The absorption edge of carbon-doped zinc oxide nanoparticles exhibited a red shift froma high-energy wavelength to lower\nin the UV-visible spectrum, due to band gap narrowing. A UV-NIR spectrometer, X-ray diffraction, emission scanning electronmicroscopy,\nenergy dispersive X-ray microanalysis, Fourier transforminfrared spectroscopy, and aUV-Vis-NIR spectrophotometer\nwere used for the characterization of the as-produced products....
The relatively large size of the gecko and its ability to climb a multitude of structures with\nease has often been cited as the inspiration upon which the field of dry adhesives is based.\nSince 2010, there have been many advances in the field of dry adhesives with much of\nthe new research focusing on developing nanoscale and hierarchical features in a concentrated\neffort to develop synthetic gecko-like dry adhesives which are strong, durable,\nand self-cleaning. A brief overview of the geckos and the hairs which it uses to adhere to\nmany different surfaces is provided before delving into the current methods and materials\nused to fabricate synthetic gecko hairs. A summary of the recently published literature on\nbio-inspired, nanostructured dry adhesives is presented with an emphasis being placed on\nfabrication techniques....
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