green synthesis and characterizations of silver and gold nanoparticles

... superparamagnetic Fe3O4 nanoparticles via a simple and green method in water and glycerol component solvent The synthesized Fe3O4 nanoparticles have an average diameter of 13 nm and the saturation ... crystalline nature of Fe3O4 nanoparticles with a clearly resolved lattice spacing of around 0.483 nm, corresponding to that of (111) of inverse spinel Fe3O4 crystal All the spots of Fourier transformed ... The XPS of the L-arginine-capped Fe3O4 nanoparticles Evidence for the existence of L-arginine coating can be found b The details of the Fe 2p1/2 and Fe 2p3/2 peaks M/emm⋅g-1 50 formation of ammonium...

Ngày tải lên: 22/06/2014, 00:20

... photoluminescence of silver and gold metals is generally attributed to electronic transitions between the highest d band and conduction sp band The composite containing Ag nanoparticles showed an emission band ... embedded metal nanoparticles The emission of silver and gold nanoparticles composite films are attributed to the embedded metal nanoparticles The adopted method demonstrates that the sizes of nanoparticles ... and XPS The composite film embedded with Ag nanoparticles is golden yellow in color and Au embedded composite film has pink color The rate of formation of Ag nanoparticles is higher than that of...

Ngày tải lên: 22/06/2014, 22:20

... biological moieties off functionalized nanoparticles [12] See et al utilized functionalized gold nanoparticles to assess the ability of cathepsin L to cleave substrates off the NPs and confirmed that ... the cells in which they are incorporated Both Ag- and Au-NPs are capable of recognizing and readily binding thiol groups of proteins and other ligands, suggesting that they would likely have similar ... a total of six replicates Statistical Analysis Data were expressed as the mean ± standard error of the mean (SEM) The one-way ANOVA (Prism statistical and graphing software; GraphPad Software,...

Ngày tải lên: 21/06/2014, 08:20

... Result and Discussion A) Characterization of nanoparticles The nanoparticles (iron oxide & gold) synthesized in the laboratory were characterized using TEM image (FEI, Tecnai S-twin) and DLS ... (Malvern Zetasizer) The size of magnetic nanoparticle was found to be nm by TEM image whereas Gold nanoparticle possessed size of nm (Figure 1, 2) The DLS data of Fe3O4 and Au nanoparticles as shown ... result in oxidative stress, inflammation and consequent damage to proteins, membranes and DNA which is one of the primary mechanisms of nanotoxicity C) Effect of gold nanoparticle on bacterial growth...

Ngày tải lên: 11/08/2014, 00:23

... prepared and used for the synthesis of silver nanoparticles ml of extract was added to 40 ml of mM AgNO3 solution for the reduction of Ag+ ions The synthesis of silver nanoparticles was carried ... different parts of plant extracts are ecofriendly, economical and safe for the synthesis of nanoparticles Use of flower extract for synthesis of nanoparticles has an added advantage of environmental ... drying of the purified silver particles they were stored at °C for further analysis B 2.5 Standardization For efficient synthesis of silver nanoparticles, effect of boiling time and effect of extract...

Ngày tải lên: 02/09/2015, 13:46

... saturation of the adsorption sites gradually on the nanowires 3.2.2 Response and recovery of the DNA-templated silver nanowires exposed to ammonia The response and recovery of the DNA-templated silver ... Figs and 4) and, importantly, the good agreement between the present results and the previous report [30] 3.2 Gas sensing performance of the DNA-templated silver nanowires 3.2.1 Effect of NH3 ... Science Foundation of China (NO 60574095), the Knowledge Innovation Program of the Chinese Academy of Science (kjcxz-sw-h12-02, 0723A11125) and the chief foundation of Hefei Institutes of Physical Science,...

Ngày tải lên: 20/03/2014, 13:08

... nanoparticles, b (i) HR-TEM of red-coloured silver sol and (ii) SAED pattern of the corresponding sol and c (i) HR-TEM of green- coloured silver sol and (ii) SAED pattern of green sol 123 3-3.9 4-4.9 ... Synthesis of anisotropic metal nanoparticles motivates the development and innovation of theoretical methods for describing the unique properties of these nanoparticles The study of colours of ... of *55 nm On the other hand, HR-TEM photograph of green- coloured silver sol (Fig 1c), obtained by using mM of sodium citrate, shows the presence of only silver nanorods of different aspect ratios...

Ngày tải lên: 21/06/2014, 17:20

... linked to gold nanoparticles was synthesized and characterized and XRD, TEM, and XPS analyses confirmed the link between Au and Pd(II) through S-bridge The nanoparticles are homogeneous in size and ... infrared typical PL of thiol stabilized Au nanoparticles [20] A difference of the positions of PL emission peaks of hybrids (1) and (2) is likely due to the different chemical structure of the organometallic ... access to the preparation of systems that can be easily used for the stabilization of gold nanoclusters Gold nanoparticles were prepared with a modified two-phase procedure, and then let to react...

Ngày tải lên: 22/06/2014, 01:20

... 591 594 50,70 and 74,50 representing (111), (200) and (220) planes of fcc structure of copper (Fig 4) Fig X-ray diffraction PVP patterns of CuNPs- Characterized by TEM The TEM image of the 5th sample ... concentration (dose of resistance fungus of about 5-7ppm (Fig.6) and dose of kill fungus of about 10ppm (Fig.7) CONCLUSIONS Copper colloidial solutions had been synthesized rapidly in chemical green condition, ... The FE-SEM image of copper oxalate showed particles in the size range of under 150 nm (Fig 2) Fig XRD pattern of copper oxalate Fig The FE-SEM image of copper oxalate Proceedings of IWNA 2011, November...

Ngày tải lên: 02/08/2015, 13:21

... Guo and Wang, Chapter 2011) A good understanding of the growth mechanisms can reduce the number of trial -and- error in shape controlled synthesis; thereby allowing the tuning of NC morphology and ... only because of its application potentials but also of the vast literature that is already available on the synthesis of Au NCs; and the ease of nanogold characterization (Eustis and El-Sayed, ... in (B) are the FFT patterns of the two halves of the NC (I and II) and the entire region (III), xiii List of figures respectively (C) HRTEM image of an edge-on facet of the shield-like Au NC (bottom...

Ngày tải lên: 09/09/2015, 18:49

... Thesis Spine SYNTHESIS AND CHARACTERIZATIONS OF POLYMER ELECTROLYTE MEMBRANES BASED ON ALIPHATIC IONOMERS DAVID JULIUS 2011 SYNTHESIS AND CHARACTERIZATIONS OF POLYMER ELECTROLYTE MEMBRANES ... Synthesis of New Alcohol-Resistant Alternative PEMs based on Aliphatic Random Ionomers (b) Structural Characterizations of Random Aliphatic Ionomers and Investigations of the Effects of Hydrophobic ... Membranes .18 Ionomers: Synthesis, Structure, and Properties 24 2.3.1 Synthesis of Ionomers: Radical Polymerization 25 2.3.1.1 Synthesis of Random and Block Ionomers 25 2.3.1.2...

Ngày tải lên: 10/09/2015, 15:49

... believed that synthesis and self-assembly of gold nanoparticles could induce novel properties and applications This project focuses on the study of synthesis and organization of gold nanoparticles ... strategic approaches of synthesis and organization of nanomaterials, especially gold nanoparticles are addressed in detail The characterization and applications of gold nanoparticles and their nanocomposites ... decomposition and they can be easily handled and functionalized as stable organic and molecular compounds By virtue of these striking features of gold nanoparticles and assistance of organics surfactants,...

Ngày tải lên: 11/09/2015, 16:06

... H2O2 and O2 are employed in controlling the shapes of nanocrystals in solution growth of silver and gold nanocrystals To produce silver and gold nanoprisms, weak reductants or precursor of reducing ... scale bar in a and b is 100 nm) image of sample A1 (a) and E1 (b) without centrifuge separation and SAED of sample A1(c) Figure 5-3 UV-Vis spectrum of silver nanocrystals The shapes of silver nanocrystals ... FESEM image of gold nanospheres covered by melting membrane of gold produced from thin gold nanoplates prepared by MSA in place of citric acid Figure 6-7 Powdered XRD of gold nanoprisms of sample...

Ngày tải lên: 14/09/2015, 08:43

... EQUATIONS FOR MELTING CURVE OF METALS COPPER, SILVER AND GOLD UNDER PRESSURE Values of potential parameters D, r0 , n and m for metals Cu, Ag and Au are taken from [9] and are summarized in Table ... MELTING OF METALS COPPER, SILVER AND GOLD UNDER PRESSURE 149 where u2 and a are the mean square displacement and the lattice parameter at the melting temperature, respectively and δL is the ... melting curve for metals Cu, Ag and Au (the pairs of equation (10) and (11), (12) and (13), (14) and (15)) have simple analytic forms and rather well describe the melting of metals REFERENCES [1] [2]...

Ngày tải lên: 30/10/2015, 19:44

... alternative of silver, gold and platinum nanoparticles because of their lower cost and catalytic activity, novel electronic, optical and magnetic properties or have antibacterial and antifungal ... to other metal nanoparticles materials, the synthesis of copper nanoparticles are more difficult because of surface easy oxidizing of copper Therefore, the synthesis of copper nanoparticles with ... RESULTS AND DISCUSSION 3.1 Synthesis of copper nanoparticles from copper oxalate precursors 3.1.2 Investigating the influence of the parameters on the size of copper nanoparticles 3.1.2.1 Effect of...

Ngày tải lên: 10/06/2016, 10:39

... moiety and Trp191 in the ligand-bound form of the enzyme Conclusion hACMSD appears to be an important enzyme controlling the cellular levels of QA, PA and NAD As a consequence, modulation of hACMSD ... ligand-bound form, and may be used to assist the structure-based rational design of enzyme inhibitors with potential medical interest Crystal structure of human ACMSD C-ter N-ter Results and ... stereochemistry of the model has been assessed using the program procheck [23] Ninety per cent of the residues fall in the most favoured regions of the Ramachandran plot, with Asn148 and His269 falling...

Ngày tải lên: 18/02/2014, 06:20

... potential, and addition of a TPP-moiety has been used to drive the selective uptake of a wide variety of Ó FEBS 2003 Fig Selective uptake of mitoDC-81 by mitochondria and subsequent alkylation of mtDNA ... mitochondria and cells In addition to facilitating the development of antigenomic therapies, such a reagent might also be useful in investigating the rate of turnover of mtDNA and in the derivation of ... the vicinity of mtDNA with the resultant binding and selective alkylation leading to a depletion of mtDNA in intact cells (Fig 1) Here we report the synthesis and characterization of a novel mitochondria-targeted...

Ngày tải lên: 20/02/2014, 11:20

... chloroform and upper aqueous phases In the absence of CMP and in both +PIS and –PIS strains, a release of label in the aqueous phase was observed after incubation To calculate the liberation of ... concentrations of manganese chloride and varying amounts of EDTA appear on the y axis just above a maximum activity of 2.0 nmol PtdInsÆmg)1Æmin)1 between 2.5 and mM EDTA At 10 mM, synthesis decreased ... the same plot of the values found for de novo synthesis in the presence of 7.5 or 2.5 mM MnCl2 with various amounts of EDTA, or in the presence of MnCl2 only [11], as a function of the concentration...

Ngày tải lên: 22/02/2014, 04:20

... activity of RP mRNA for adjustment of the biosynthesis of ribosomes to the requirements of cell growth and differentiation In addition, a relevant contribution of protein turnover to the regulation of ... ribosome pathologies have had in our understanding of regulatory mechanisms of RP synthesis Translational regulation of RP synthesis Sequence comparison of some vertebrate RP genes cloned in the ... mechanism of DBA in cultured cells showed that alteration of any of the involved RPs can affect the maturation of rRNA [72] Moreover, investigations on the effect of mutations on the synthesis of RPS19...

Ngày tải lên: 07/03/2014, 01:20

... parameters and transport characteristics of Bip-[3H]Pro Results and Discussion Synthesis, chemical characterization and stability of Bip-Pro Figure shows the structure (Fig 1A) and the synthesis ... cells and 10 and 100 lm in SKPT cells) in the presence of increasing concentrations of Bip-Pro (0– 100 lm and 0–50 lm, respectively) The results are Fig Interaction of Bip-Pro with PEPT1 and PEPT2 ... concentrations and at increasing Bip-Pro concentrations The diffusional component of [14C]Gly-Sar uptake, of 8% in Caco-2 cells and of 4% in SKPT cells, measured in the presence of excess of Gly-Sar...

Ngày tải lên: 07/03/2014, 05:20