The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Hydroxyapatite (HAp) nanopowders were prepared by chemical precipitation method, and the powders were characterized by FETEM, XRD and ICP-AES technologies. The adsorption results of m-nitrophenol on HAp nanopowders in aqueous showed that the adsorption capacity increased with the increase of the phenol concentration and the temperatures. The adsorption process was in accorded with Freundlich and Langmuir...
Synthesis of mesoporous TiO2 particles using ionic liquid (IL)-assisted sol-gel method was investigated. The product was analyzed and characterized by X-ray diffraction (XRD), Transmission electron microscope (TEM), and N2 adsorption and desorption. The products revealed higher photo catalytic activities than that of the commercially available TiO2, Degussa P25 in the photo degradation of methylene...
This paper reports on the design and experimental verification of the first prototype of a resonant sensing platform based on nanoscaled aluminum nitride Contour-Mode Resonant Sensors (CMR-S) for selective detection of sub-ppb levels of volatile organic chemicals (VOCs). For the first time arrays of 8 nano-CMR-S were fabricated on the same chip and functionalized with two different thiol-terminated...
The synthesis of NiMo/Al2O3 nanocatalyst by the method of supercritical deposition using carbon dioxide and methanol was conducted and its activity was investigated as the function of conversion and selectivity. The results of the physical and chemical characterization techniques (adsorption-desorption of nitrogen, oxygen chemisorption, XRD, TEM, and TPR) demonstrated high and uniform dispersion of...
A micro gas preconcentrator which has a single walled carbon nanotube (SWNT) film as a sorbent material was fabricated by MEMS technology. This work is the first to investigate the performance of SWNTs in the preconcentrator by evaluating their adsorption capacity. Octane adsorption experiments were carried out for 60 minutes on the newly fabricated preconcentrator and the concentration factor was...
We have developed a method using a scanning tunneling microscope (STM) probe tip to control the chain polymerization of diacetylene compounds in a self-ordered layer, thereby creating conjugated polydiacetylene nanowires. When a small amount of phthalocyanine was deposited on a molecular layer of diacetylene compound, we found adsorbed and stabilized phthalocyanine single molecules. The initiation...
The process of Si-Ge heterostructures formation in nanowhiskers (NWs) grown by the vapor-liquid-solid mechanism was investigated using Monte Carlo simulation. It was demonstrated that it is impossible to grow atomically abrupt axial heterojunctions via classical vapor-liquid-solid mechanism due to gradual change of catalyst drop composition when switching the fluxes. Dependences of GexSi1-x composition...
Tobermorite is a mineral material with good ion exchange properties. The potassium feldspar ore from Lushi country is muscovite syenite. Potassium feldspar was hydrothermally decomposed with CaO as an additive, and then tobermorite nano-scale powder was synthesized. Based on the research work of our group, the adsorption property of tobermorite to Pb2+ from aqueous solution was studied. The factors...
Novel ZnS/CeO2 nanocomposite samples with different molar ratios were synthesized by the homogeneous precipitation method and hydrothermal method. The molar ratio of ZnS to CeO2 are 0.2:0.8, 0.4:0.6, 0.5:0.5, 0.6:0.4, and 0.8:0.2. Phase composition, crystallinity, crystal size, and morphology of novel ZnS/CeO2 nanocomposites were characterized by X-ray diffraction (XRD), scanning electron microscopy...
It is widely accepted that self-assembling nanostructure of metals with well-defined spatial order is one of the promising ways for engineering new materials. Recent years revealed substantial progress in fabricating metal nanoparticles on ultrathin oxide films due to their ordered surface. In this work, we present the results on the adsorption of Pd nanoparticles on the ultrathin Al2O3 films prepared...
Nanoporous SnO2 with high photocatalytic activity has been successfully prepared by a photochemical method. The as-synthesized sample was characterized by XRD, N2 adsorption-desorption, TEM, UV/vis and FTIR. The photocatalytic activity of the sample was evaluated by the decomposition of methyl orange(MO) aqueous solution under different light source(UV, sunlight and visible light) and was compared...
Mesoporous, nitrogen-doped TiO2 (TiO2-xNx) nano-crystal is potentially technologically important materials due to its developed porosity and visible-light responsive performance. These are important parameters for photocatalysis and dye sensitized solar cells (DSSCs) with regard to adsorption and conversion of solar energy efficiency. We have recently developed an effective solvent evaporation induced...
In this paper we present a simple and facile method to synthesize tin dioxide (SnO2) nanowires by solvent-free infiltration method using SnCl2??2H2O as precursor and mesoporous silica SBA-15 as hard template. No solvent were used during the processing. The products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and N2 adsorption/desorption isotherms. The...
Porous materials with hierarchical bimodal pore size distributions are a special type of nanomaterials and have important applications in a wide variety of fields such as separation, catalysis, adsorption, and sensing. Here we present an exploratory study on the fabrication of hierarchically ordered porous silica membranes by a templating method. The obtained membranes have ordered hierarchical nanopore...
Silicon nanowhisker (NW) growth was investigated by Monte Carlo simulation. Dependence of NW growth rate on radius R was obtained. Growth rate was found to be proportional to 1/R2 for diffusion growth mode and radius independent for adsorption mode.
A novel photocatalyst (Bi20TiO32) was synthesized by chemical solution decomposition (CSD) and it was calcined at the temperature of 300??C. It exists in nanosheets with a diameter around 90 nm. The as-prepared Bi20TiO32 is visible-light responsive (up to 500nm in wavelength) without sacrificing its ability for absorbing UV light. The specific activity of Bi20TiO32 is higher than anatase TiO2 under...
In this work, we present a systematic investigation of the influence of mixed-phase TiO2 with various a-TiO2 to r-TiO2 ratio (A/R) toward the DSSCs efficiency. It was found that though a-TiO2 showed better performance than r-TiO2 in DSSCs, the Ru-bipyridine dye (N719) sensitized TiO2 films fabricated by mixed-phase TiO2 with A/R = 9 gives the highest cell efficiency.
To further enrich aluminum content in coal fly ash so as to reduce the cost of it as a resource for industrial aluminum extraction, a novel process was developed to separate silicon from the rest of fly ash. The process was conducted by treating the coal fly ash with high concentration sodium hydroxide solution to dissolve silicon as sodium silicate at room temperature under atmosphere. The sodium...
This paper reports a rapid, simple and direct method for the synthesis of gold nanoparticles (AuNPs) in polypyrrole (PPy) film, which provides a biocompatible matrix for the strong adsorption of antibodies. The electrochemical synthesis of AuNPs/PPy composite on gold or carbon electrode occurs within 20 minutes, and does not involve addition of any nanoparticles or reducing agent. This method is compatible...
Aligned zinc oxide nanorods thin film was synthesized by the hydrothermal method. The nanorods were vertically aligned on an indium tin oxide substrate. The length of the nanorods can be controlled by repetitive reactions. Preliminary results of the humidity sensing properties of the nanorods are reported. A 450 nm thick nanorods thin film was measured in this paper. The resistance response under...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.