synthesis of supported metal catalysts by dendrimer metal precursors

... 5:1387–1392 length of nanowires is up to several tens of micrometers Au particle can be found on the top of each nanowire, and the diameter of the nanowire is consistent with the size of Au particle, ... growth of 1-D nanostructures In order to guide the growth of the teeth of nanocombs, Au nanoparticles are introduced in our experiment A thin layer of Au was deposited on the surface of as-grown ... the side surface of Ga2O3 nanowires, which may derive from the difference of surface energy of Ga2O3 crystal planes Orderly arrange of Au nanoparticles on the specific plane of Ga2O3 nanowire...

Ngày tải lên: 21/06/2014, 17:20

... nontoxic nature 1.2 Supported metals in nanocatalysts An important group of heterogeneous catalysts is the group of supported metal catalysts, generally containing small metal particles dispersed ... properties of the supported metal particles.[59] It has been well documented that by manipulating the properties of oxide substrate, the stability and catalytic performance of supported metal clusters ... properties and performance of nanocatalysts, much remains to be learned Research in nanocatalysts by using supported metal is challenging for several reasons First, as supported metal clusters or nanoparticles...

Ngày tải lên: 09/09/2015, 10:15

... diacetate (10) 40 4.7 Synthesis of Folate-NHS (11) 41 4.8 Synthesis of Folate-DOTA (13) 42 4.9 Synthesis of Folate-DO3tBu (12) 43 4.10 Synthesis of Mannich Salt (14) 46 4.11 Synthesis of Bis-disulfide ... Bis-disulfide (15) 47 4.12 Synthesis of Bis-sulfone (16) 48 4.13 Synthesis of Bromoethyl-bis-sulfide (18) 50 4.14 Synthesis of Piperazine-bis-sulfide (23) 52 4.15 Synthesis of Tert-butyl 4-(2-aminoethyl) ... department of NUS for giving me the opportunity to undertake this project i Table of Contents TABLE OF CONTENTS Acknowledgements i Table of Contents ii List of Figures v List of Schemes vi Index of Abbreviations...

Ngày tải lên: 16/10/2015, 11:57

... presence of 0.02 mM [a-32P]ATP While confirming the adenylylation of these compounds and the absence of synthesis of poly(A) by the E coli poly(A) polymerase, we did not observed adenylylation of guanosine, ... independent synthesis of poly(A) In order to understand why dinucleoside polyphosphates activated the primer independent synthesis of poly(A), the effect of 0.01 mM Gp4G or Ap4A on the synthesis of poly(A) ... taken and analyzed by HPLC as indicated in Materials and methods Relative activity of GpnGs as effectors of the synthesis of poly(A) Based on the above results, the effect of several diguanosine...

Ngày tải lên: 21/02/2014, 01:21

... fraction of magnetite In this paper, we report a facile one-pot synthesis of PANI/magnetite nanorod composites through DBSA micelleassisted synthesis by in situ self-assembly method The presence of ... scheme of the possible synthesis mechanism of the composite particles is shown in Fig By taking advantage of the micelle reaction system, we firstly obtained colloidal PANI doped with DBSA by the ... the decomposition of PANI As seen from the TGA curves, the rate of weight loss of PANI (curve a) is much fast, the residue of PANI is 44.06%; while the rate of weight loss of PANI/magnetite nanocomposites...

Ngày tải lên: 20/03/2014, 13:04

... formation of Pd nanoparticles [21] But, in the current procedure, reduction of Pd by oxalate occurs so rapidly and of UV irradiation is sufficient for the complete reduction of PdCl2 (20 mL of mM) ... morphology in the synthesis of metal nanoparticles [30] Synthesis of Pd nanoparticles from PdCl2 and potassium oxalate is schematically explained in Fig The optimized geometry of oxalate di anion ... is the intensity of the (hkl) reflection of the sample under analysis, Io(hkl) is the intensity of the (hkl) reflection of a polycrystalline bulk sample and ‘n’ is the number of Nanoscale Res Lett...

Ngày tải lên: 22/06/2014, 01:20

... and good quality of MWCNTs obtained by mechanothermal makes it a suitable promising method of synthesis for the production of MWCNTs or other graphitic nanocarbons Indeed, because of the simplicity ... determination of the surface areas of solid materials and involves the use of the BET equation:   1 CÀ1 P ¼ þ W½ðP0 =PÞ À 1Š Wm C Wm C P0 wherein W is the weight of gas adsorbed at a relative pressure of ... carbon-coated copper gird A drop of alcohol was first added to the nanofiber film Then, the film was scratched by a pair of tweezers attached to the carbon-coated copper gird Most of the nanotubes are Fig...

Ngày tải lên: 22/06/2014, 01:20

... characterized and the bimetallic catalysts were evaluated in D-glucose hydrogenation Chapter is the details of synthesis of the mesoporous carbon microfiber supported Ru catalysts by Chapter Introduction ... migration of the Ru particles (Maris et al., 2006) 1.4 Carbon -supported catalysts for hydrogenation reactions Many heterogeneous hydrogenation catalysts consist of metals or metal compounds supported ... Physicochemical properties of bimetallic Ru-Cu catalysts Table 5.2 The chemisorption results of the catalysts Chapter Table 6.1 Physicochemical properties of Ru catalysts Table 6.2 Metallic dispersions...

Ngày tải lên: 11/09/2015, 10:18

... reduction, as characterized by IC50s of 10.7 lm and 81.4 lm for inhibition of OmcA and OmcB, respectively Modes of inhibition of either OmcA or OmcB by V(V) The modes of inhibition of either OmcA- or ... undefined metal specificity To address these latter issues, we constructed omcA, omcB and omcA ⁄ omcB insertion mutants of MR-1, and analyzed them in terms of dissimilatory reduction of a variety of metals, ... accessibility of the presented metal play crucial roles in terms of binding efficiencies and subsequent reduction by the appropriate enzyme The identification and characterization of alternative terminal metal...

Ngày tải lên: 07/03/2014, 09:20

Ngày tải lên: 16/03/2014, 00:07

... optima The spectrum of antibacterial action of endolysins is determined by the enzyme type, composition of the cell wall components of the target bacterium, and configuration of the substrate (peptidoglycan) ... induced synthesis of a protein product of the expected size (about 15 kDa) The sequence of the lys gene in the plasmid was checked by sequencing both DNA strands Inside the cell, all of the protein ... reaction was initiated by the addition of a chloride of the corresponding metal The activity was calculated as a percentage of the initial activity, measured in the absence of chelators Values represent...

Ngày tải lên: 30/03/2014, 02:20

... activity of three-way catalysts based on mixed metal oxides for the treatment of exhaust gases from internal combustion engine EXPERIMENTAL 2.1 Synthesis of the catalysts 2.1.1 Sol-gel synthesis of ... 2.1.2 Catalysts supported on γ-Al2O3 In order to compare the activity of metallic oxide and precious metal, the metallic oxide catalysts were impregnated on commercial γ-Al2O3 A suitable amount of ... ACObypass  100% AC3 H6bypass  AC3 H6 outlet AC3 H 6bypass ANObypass  ANOoutlet ANObypass  100% 100% Synthesize and investigate the catalytic activity of three-way catalysts based on mixed metal...

Ngày tải lên: 12/05/2014, 17:14

... Pd-Cu-Ni-O etc The presence of sulphur and carbon in the metal oxides was avoided by using non-sulphur, non-carbon containing metal precursors The synthesis of Pd- based metal oxides by this sonochemical ... to this reactor was provided by an aquarium pump Method of Synthesis of metal oxides Fig Flow diagram of the synthsis process of Pd+CuO 92 Inorganic Nanomedicine: Synthesis, Characterization ... copper oxide [21] Inorganic (metal) salt precursors The type of inorganic precursors used in the synthesis depends on the metallic oxides to be synthesized, which includes precursors with organic...

Ngày tải lên: 11/06/2014, 12:29

... which acted as bridges connecting metal ions and CNMs Our methods can be applicable for a large variety of metal ions By adopting bi -metal or even tri -metal precursors in a certain mole ratio, ... Nanotubes for Detection of Every Nanotube by Surface-Enhanced Raman Spectroscopy J Am Chem Soc 2009, 131:14310 13 Li J, Tang SB, Lu L, Zeng HC: Preparation of Nanocomposites of Metals, Metal Oxides, and ... were seldom observed by TEM observation The sizes and loading ratio of NPs on SWNTs can be controlled by altering temperature, the ligand, and the initial concentrations of the metal ions It is worth...

Ngày tải lên: 21/06/2014, 06:20

... burning of graphitic layers of nanotubes and a slight weight gain at 850 °C of Ni-encapsulated MWNB may be due to the formation of higher oxides of metal after complete burning of graphitic layers of ... concentrated on the synthesis of SWNT, MWNT and metal- filled MWNT, addressing various key issues such as scale up, reproducibility and low cost Several methods of filling of CNTs by foreign metal nanowires ... properties of metal- filled MWNB have been studied using a PAR vibrating sample magnetometer up to a magnetic field of 10 kOe, and the results have been discussed by comparing with those of metal- filled...

Ngày tải lên: 21/06/2014, 22:20

... deposition of SWNTs Various bimetallic catalysts have been used as catalysts for the production of hydrogen [23] Carbon nanofibers possessing a platelet structure were obtained by Wang et al., by decomposition ... alloy used for the preparation of hydride catalysts Figure 2b shows the EDX spectra of Nifilled MWNT TEM and HRTEM images of SWNTs obtained at a growth temperature of 950°C are respectively shown ... TEM images of Zr-based AB2 alloy filled MWNTs grown at a temperature of 850°C, (c) HRTEM image of Ni-filled MWNT grown at 875°C, (d) TEM image of MWNTs grown at 900°C optical mode E2g of two-dimensional...

Ngày tải lên: 22/06/2014, 22:20

... removal of RO16 dye by Cu-AC4 catalyst in the presence of UV, H2O2 and H2O2 /UV Journal of Physical Science, Vol 21(2), 29–40, 2010 37 The presence of H2O2 and H2O2/UV enhanced the colour removal by ... oxide supported on Al2O3 and active carbon Mater Lett., 17(5), 297–302 Wang, S & Lu, M G Q (1997) Effects of oxide promoters on metal dispersion and metal- support interactions in Ni catalysts supported ... corresponding Cu -supported catalyst on the decolourisation of Reactive Orange 16 (RO16) dye The chemical structure of RO16 dye is shown in Figure Figure 1: The chemical structure of RO16 dye Journal of Physical...

Ngày tải lên: 07/08/2014, 14:20

... and Design of Experiment 31 3.2 Synthesis of Carbon Coated Tin oxide (SnO2@C) Hollow Spheres 34 3.2.1 Synthesis of PVP-Modified Polystyrene (PS) Beads 34 3.2.2 Synthesis of Tin Oxide ... Motivations and Design of Experiment 68 5.2 Synthesis of rGO Incorporated Porous Hollow Fe3O4 Beads (Fe3O4/rGO) 70 5.2.1 Preparation of GO 70 5.2.2 Synthesis of rGO Incorporated ... Motivation and Design of Experiment 88 6.2 Synthesis of Uniform Mesoporous Carbon Spheres embedded by Fe3O4 Nanoparticles (IONP@mC) 90 6.2.1 Synthesis of Water-soluble Fe3O4...

Ngày tải lên: 10/09/2015, 09:30

... control of all of them; The synthesis of Ag@AgAu metal core alloy shell nanoparticles with tunable shell composition This type of bimetallic nanoparticles was formed by carefully controlling the synthesis ... nanoparticles is determined by the mole ratio of metals atoms to dendrimer molecules One unique feature of nanoparticles stabilized by dendrimers is that they are confined primarily by steric effects, ... In addition to the reduction of metal ions, thermal decomposition of organometallic compounds in the presence of surfactants is another approach to the synthesis of metal 20 Chapter nanoparticles...

Ngày tải lên: 11/09/2015, 09:01

... DEVELOPMENT OF SEMICONDUCTOR METAL OXIDE GAS SENSORS MODIFIED BY MESOPOROUS SILICA MATERIALS YANG JUN (PhD, NUS) A THESIS SUBMITTED FOR THE DEGREE OF PH.D OF ENGINEERING DEPARMENT OF CHEMCIAL ... 1000 ppm of H2 by SnO2(40%)/SBA-15 sensor and (b) 1000 ppm of CO by SnO2(45%)/SBA-15 sensor at different operating temperatures Fig 4.6 Effect of SnO2 content on the sensitivity at 250oC of SnO2/SBA-15 ... ppm of H2 and 1000 ppm of CO on SnO2(45 wt%)/MCM-41 composite gas sensor Fig 6.8b Effect of SnO2 content on the sensitivity of SnO2/MCM-41 composite sensors to 1000 ppm of H2 and 1000 ppm of CO...

Ngày tải lên: 12/09/2015, 08:20