Onion-like fullerenes synthesized by arc discharge in water were used as support of Pt nanoparticles as electrocatalytic materials for direct methanol fuel cell. Uniform platinum nanoparticles with the average diamete...
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Onion-like fullerenes synthesized by arc discharge in water were used as support of Pt nanoparticles as electrocatalytic materials for direct methanol fuel cell. Uniform platinum nanoparticles with the average diameter of about 4.3 nm were well dispersed on the surface of onion-like fullerenes by impregnation-reduction method. The morphologies and microstructures of the as-prepared composites were studied by means of XRD and TEM. Electrochemical analysis shows that this kind of nano material may be an excellent candidate to be used as the support of catalyst for methanol electrochemical oxidation.
A hydrotalcite with Mg/AI molar ratio 2 was prepared by co-precipitation method and was characterized by XRD, TG/DTA, Zeta potential and BET surface area. The hydrotalcite was calcined at 500℃, with the dehydration f...
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A hydrotalcite with Mg/AI molar ratio 2 was prepared by co-precipitation method and was characterized by XRD, TG/DTA, Zeta potential and BET surface area. The hydrotalcite was calcined at 500℃, with the dehydration from interlayer, the dehydroxilation from the brucite-like layer and the decomposition of carbonate successively, transformed into the mixed oxide type. The removal of thiocyanate from aqueous solution by using the original hydrotalcite and calcined hydrotalcite （HTC-500） was investigated. The results showed that the thiocyanate adsorption capacity of calcined hydrotalcite was much higher than that of the original form. Calcined hydrotalcite was particularly effective at removing thiocyanate, and that the effective range of pH for the thiocyanate removal are between 5.5-10.0. The experimental data of thiocyanate removal fit nicely with Langmuir isotherm, and the saturated adsorption uptake was 96.2 mg SCN-/g HTC-500. The adsorption of thiocyanate by calcined hydrotalcite follows first-order kinetics. And the intercalation to the structure recovery for calcined hydrotalcite. But the presence of additional anions could affect the adsorption behavior of thiocyanate.
The deoiled asphalt as the carbon source and the ferrocene as the metal source and the catalyst precursor were chosen to synthesize iron-containing carbon microparticles through co-carbonization at the temperature of ...
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The deoiled asphalt as the carbon source and the ferrocene as the metal source and the catalyst precursor were chosen to synthesize iron-containing carbon microparticles through co-carbonization at the temperature of about 450℃ for 3 h. The resulting products were treated at 2 000 ℃ for 2 h. All samples were examined by high resolution transmission electron microscopy （HRTEM） and X-ray diffraction （XRD）. The results show that the iron particles in the heat-treated material are completely coated by carbon. In addition to the fully filled carbon microparticles as well as hollow carbon ones, also form carbon fibers with hollow centers. The formation mechanism of the as-prepared products was discussed briefly.
By use of chemical vapor deposition (CVD) method, GaN nanowires were synthesized via direct reaction of the films of Ga2O3 which were spined on the Si substrate with flowing ammonia without any catalyst. X-ray diffrac...
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By use of chemical vapor deposition (CVD) method, GaN nanowires were synthesized via direct reaction of the films of Ga2O3 which were spined on the Si substrate with flowing ammonia without any catalyst. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) equipped with an energy dispersive spectroscopy (EDS) and high resolution transmission electron microscopy (HRTEM) were used to characterize the samples. The results show that: the products are straight and smooth GaN nanowires. Their diameters are in the range of 30-50 nm and the lengths can be up to several decades of microns. GaN nanowires are obtained with hexagonal structure.
GaN nanobelts were synthesized by direct reaction of gallium with flowing ammonia using nickel as a catalyst. Field emission scanning electron microscopy (FESEM) equipped with an energy dispersive spectroscopy (EDS) a...
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GaN nanobelts were synthesized by direct reaction of gallium with flowing ammonia using nickel as a catalyst. Field emission scanning electron microscopy (FESEM) equipped with an energy dispersive spectroscopy (EDS) and high resolution transmission electron microscopy (HRTEM) were used to characterize the samples. The results showed that the products are hexagonal wurtzite structure. The width of the nanobelts are in the range of 80-150 nm, the thickness ranged from 3 nm to 10 nm and their lengths can be up to several tens of microns. The growth mechanism of the GaN nanobelts was discussed.
The wool fibers were carved and corroded to get rough surface by using ultraviolet radiation. So the antibacterial wool fibers were prepared by grafting the nanometer silicon dioxide silver-loaded antibacterial agent....
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The wool fibers were carved and corroded to get rough surface by using ultraviolet radiation. So the antibacterial wool fibers were prepared by grafting the nanometer silicon dioxide silver-loaded antibacterial agent. The physical, antibacterial and washable properties were characterized by using SEM, IR, etc. The surface layer of 200 nrn thickness was constructed, and the nanometer antibacterial agents are connected with the wool fibers by the chemical bonds. And the nanometer antibacterial agent is not simply attached to the surface by physical adsorption. The antibacterial efficiency of Escherichia coli and Staphylococcus aureus is up to more than 96% without washing, and it is more than 90% after repeated washing (at least 20 times).
Acrylate acid series polymer with light-sensitive nature is the key material used in ultraviolet stereolithography technique. It was synthesized by reacting of polymer with terminal epoxy group and acrylic acid. Using...
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Acrylate acid series polymer with light-sensitive nature is the key material used in ultraviolet stereolithography technique. It was synthesized by reacting of polymer with terminal epoxy group and acrylic acid. Using epoxy resins and acrylic acid as the raw materials, epoxy acrylic (EA) were polymer used in ultraviolet solidification. The process of cross linkage reaction and photopolymerisable action of photopolymer and photo-initiator were discussed. FTIR and SEM were characterizes the molecule photopolymerisable action and the structure of the architecture. The results show the structure of polymer had changed into a cross-linked irregular spatial net configuration after the photopolymerisable reaction. When the mass percent of free radical photo-initiator in the structure of polymer is 3.5%, the conversion rate of C=C double bond is the highest.
Needle-like Mg(OH)2 nanoparticles, with diameters in the range of 9-12 nm and lengths of 40-110 nm, were synthesized in aqueous solution employing reversed precipitation in the presence of the surfactant sodium dodecy...
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Needle-like Mg(OH)2 nanoparticles, with diameters in the range of 9-12 nm and lengths of 40-110 nm, were synthesized in aqueous solution employing reversed precipitation in the presence of the surfactant sodium dodecyl benzene sulfonate (SDBS), using magnesium chloride and sodium hydroxide as reactants. The obtained samples were characterized in terms of crystal structure, particle size and morphology by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), and transmission electron microscopy (TEM). The effect of surfactant/dispersant on the morphologies of the as-prepared samples was discussed. The results show that needle-like Mg(OH)2 nanoparticles can be obtained in the presence of SDBS.
Silver-loading nano-SiO2 antibacterial agent (SLS) was synthesized by adsorbing silver cation onto nano-SiO2 carrier. silver content of specimens was determined by atomic absorption spectrum (ICPS). The morphology and...
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Silver-loading nano-SiO2 antibacterial agent (SLS) was synthesized by adsorbing silver cation onto nano-SiO2 carrier. silver content of specimens was determined by atomic absorption spectrum (ICPS). The morphology and structure of the specimen was characterized by using X-ray diffraction (XRD) and nigh-resolution transmission electron microscopy (HRTEM) techniques. Also, the antibacterial performance of the specimens were examined. The experimental results indicated that the silver ion is loaded in the porous of nano-SiO2, and exist as nano-particles form. Antibacterial properties of nanometer Ag/SiO2 antibacterial agent was excellent against E. coli and S. faecalis.
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