Báo cáo hóa học: " Preparation of Pt Ag alloy nanoisland/graphene hybrid composites and its high stability and catalytic activity in methanol electro-oxidation" potx

... activities of Pt materials and the so-called “ catalyst poisoning.” All PtAg alloy hybrids had good performance than pure Pt hybrids. The higher activity of PtAg alloy hybrids can be explained by ... 6:551 http://www.nanoscalereslett.com/content/6/1/551 Page 9 of 10 NANO EXPRESS Open Access Preparation of Pt Ag alloy nanoisland/graphene hybrid composites and...

Ngày tải lên: 20/06/2014, 22:20

... iron and platinum elements on several points of the nanoparticles, alloying of Fe Pt alloy in the nanoparticles can be confirmed. Except carbon and copper from the grids, the existence of other element ... for ultra -high density recording media [1] of which materials require a high magnetocrys- talline anisotropy for thermal stability of magnetization, biomedical appli...

Ngày tải lên: 22/06/2014, 00:20

... out of solution using the droplet technique. The main subject of investigation was how the anions and substrates influence the emerging surface topology during and after the preparation. Regarding ... interaction is the antiferromagnetic cou- pling of the central Cr III ion with the six terminal Mn III ions which results in a spin ground state of the molecule of S t = 21/2. T...

Ngày tải lên: 21/06/2014, 01:20

... solutions with stirring for 0.5 h, and then transferred into 50-mL container of a Teflon-lined stainless steel autoclave. The autoclave was heated and maintained at 150°C for 24 h and then cooled ... content of anatase decreased and the content of rutile increased in the range of 1–5 M HCl solutions. A maximum of content of rutile can be obtained in the 5 M HCl solution...

Ngày tải lên: 21/06/2014, 08:20

... deposited onto the pretreated conducting glass using the screen printing technique and sintered again at 450°C for 15 min and at 500°C for 15 min in air. Assembly of the DSSCs The nanoporous TiO 2 ... dye, and the electrolyte. In addition, a high level of dye adsorption on TiO 2 in the form of nanorods and nanotubes is expected because of the high surface are...

Ngày tải lên: 21/06/2014, 17:20

... capable of generating DC voltage up to 60 kV. The voltage for electrospinning was kept at 18 kV. Two pieces of stainless steel stripes with an air gap of 8 mm were placed 18 cm below the tip of the ... 8–10 h and coated for 6–15 min, but it still kept suspended and tight with a length of 4 mm, indicating that PVP has good thermal and mechanical stability. Fig- ure 2b is optic...

Ngày tải lên: 22/06/2014, 00:20

... shown in Fig. 5 in the absence of an external magnetic field. The bulk phase Mo ¨ ssbauer spectrum of Fe 3 O 4 is composed of two sets of magnetic sextets at room temperature [26]. The spectrum of ... be applied in clinical diagnosis and used as a medicine transporter [7–10]. Magnetite nanoparticles are usually synthesized in aqueous solutions [11, 12] via coprecipitation...

Ngày tải lên: 22/06/2014, 00:20

... pectin–ZnO composite sample; this is a typical IR absorption peak of ZnO, originating from stretching mode of the Zn–O bond [14]. The remaining peaks in pectin– ZnO composite are induced by pectin, ... spectrum of the pectin–ZnO composite Fig. 4 TEM image of the composite of pectin-wrapped ZnO nanoparticles. The inset is a magnified TEM image of a pectin– ZnO composite particle w...

Ngày tải lên: 22/06/2014, 01:20

... the pamphlets and posters that depict the nature, causes, and signs and symptoms of stress, stress reduction through adopting a healthy life style, and methods of managing stress in the workplace. ... Stress Management. This is an interactive lec- ture session on stress management in the workplace and designed to reinforce the participants' understanding of occupation...

Ngày tải lên: 20/06/2014, 00:20

... molecule in the maintenance of vas- cular homeostasis and predominately produced by endothelial cells. We examined the levels of NO in cell media and in cell-scaffold composite to confirm and quantify ... surrounding environment [30,31]. In hard tissues, proteins such as osteopontin, bone sialopro- tein, and osteocalcin were able to recognize HA through highly acidic domai...

Ngày tải lên: 20/06/2014, 01:20