microwave assisted synthesis of nanolayer carbides and nitrides

... attributed to the ion assisted growth of the crystallites which may be different for OHassisted growth in the case of S1 and Cl- assisted growth in S2 and Cl- and NH4? assisted growth in S3 The ... spectra of titania nanostructures S1, S2, and S3 The onset of absorption for the three samples is 382, 405, and 415 nm for S1, S2, and S3, respectively To determine the nature of the band gap, ... NaCl (5.0 M), and NH4Cl (5.0 M) were employed for the synthesis A typical microwave oven (Whirlpool, 1200W) operating at a frequency of 2,450 MHz was used for the synthesis Synthesis of TiO2 Nanostructures...

Ngày tải lên: 22/06/2014, 01:20

... Optical performance of CdTe cores and corresponding CdTe/CdSe type II QDs by means of microwave- assisted synthesis The optical performance of a series of original CdTe cores and corresponding CdTe/CdSe ... treatment of the samples was done with three UV lamps, and the intensity of the illuminated light was 16 W Results and discussion The typical band structure alignment of the conduction and valence band ... Figure Band structure alignment (a) Alignment of the conduction and valence band edges for CdTe/CdSe core/shell type II heterostructures (b) XRD patterns of CdTe and CdTe/CdSe core/shell QDs via microwave- assisted...

Ngày tải lên: 21/06/2014, 03:20

... substrate and dispersed in a solution of HAuCl4 (10 mL, 0.1 M) with the aid of ultrasonication to give a suspension The suspension was supersonicated for 30 min, aged for h, and was gravity-filtered and ... 7:1 on average While, the EDX spectrum of particle-linked wires on the tip of SiNWs film, shown in Fig 2b, reveals that these wires consist of Si, C and O, and further quantitative analysis shows ... surface of the SiNWs without any aggregation The SAED pattern Fig (a) Low magnification TEM image of SiNWs; (b) TEM image of a single particle-linked wire; (c) TEM image of a single straight SiNWs and...

Ngày tải lên: 16/03/2014, 15:06

... 10 s a and b 25 s of exposure to microwave; and c ZnO nanopowder in grams quantity Fig a–d Low and high magnification FESEM images of ZnO nanowires Figure 5a illustrates the morphology of a nanowire ... quantities (grams) of ZnO nanopowder were collected from the inner wall of the glass container (Fig 1) Photographic images of the microwave absorber after exposing for 10 and 25 s to microwave are ... nanowires: the formation of crystalline nuclei and axial growth of ZnO nuclei [17] The formation of nuclei depends on experimental parameters We used swift microwave synthesis to grow Nanoscale...

Ngày tải lên: 22/06/2014, 00:20

... pseudosubstrates and as reversible and irreversible inhibitors of EIIGlc and EIIMan Two assays were employed: (a) nonvectorial phosphorylation of Glc (analogues) by solubilized and purified EII and by EII-containing ... 279 ([M + Na]+, 100%) RESULTS Synthesis of inhibitors The synthesis and characterization of compounds 1b, 1d, 1f, 1g and 3b (Scheme 1) is reported for the first time, and the epoxypropyl derivative ... (1982) Synthesis of destomic and epidestomic acid, and their C-6 epimers Carbohydr Res 104, 87–104 30 Johns, B.A., Pan, Y.T., Elbein, A.D & Johnson, C.R (1997) Synthesis and biological evaluation of...

Ngày tải lên: 21/02/2014, 01:21

... has a Y-shape, with arms of a uniform width of 200 nm, and a length of a few microns Careful studies of the TEM images and electron diffraction data may unravel the nature of the junction In Fig ... planes of silicon The crystallinity of the nanowires is considerably higher when only argon was used instead of a mixture of argon and hydrogen The role of hydrogen in promoting the amorphization of ... characteristic of cubic silicon with a small impurity of silica Reaction of silicon powder with activated carbon in the absence of H2 , by procedure (ii), yielded abundant quantities of SiNWs The...

Ngày tải lên: 16/03/2014, 15:04

... 30 and was quickly cooled to 0–4 ◦ C using the ice-water bath Then, ml of X Ding et al / Journal of Colloid and Interface Science 320 (2008) 341–345 343 Fig Schematic illustration of the synthesis ... 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 ... Ministry of Science and Technology and NSFC, China for their financial supports (Nos X Ding et al / Journal of Colloid and Interface Science 320 (2008) 341–345 2006BAKB05, 20475053, and 20673109)...

Ngày tải lên: 20/03/2014, 13:04

... forces of samples S1, S2, and S3 are 67, 146, and 584 Oe, respectively, indicative of soft magnets The remnant magnetizations of samples S1, S2, and S3 at K are determined to be 0.00007, 0.0024, and ... amount of Na2 SO3 and other kind of inorganic ions were performed Keeping the amounts of FeSO4 and water constant, the molar ratio between FeSO4 and Na2 SO3 varied Fig 3a is the TEM image of the ... simple and versatile approaches to synthesize 1D nanostructures of α-Fe2 O3 that are easily tunable in size, which will then facilitate our understanding of the shape and sizedependent properties of...

Ngày tải lên: 05/05/2014, 15:26

... Introduction to Microwave Chemistry a general lack of understanding of the basics of microwave dielectric heating The risks associated with the flammability of organic solvents in a microwave field and the ... distributed and can couple with the oscillating electrical field of the microwaves The effectiveness or rate of microwave heating of an ionic solution is a function of the concentration of ions in ... subjected to microwave irradiation, the transfer of microwave energy takes place as a result of direct interaction with the electric component of the microwave field This transfer of microwave energy...

Ngày tải lên: 29/05/2014, 17:31

... the microwave- assisted synthesis method Thus, beyond being rapid and easy to use, microwaveassisted synthesis of upconversion nanocrystals allows for the crystallization of new nanocrystals and ... conductive heating Shape and size of these particles are roughly in the order of magnitude of the standard conditions described above However, the XRD pattern (inset Figure 4B) of these nanocrystals ... in length and with a roughly calculated aspect ratio of 1:3 Both micrographs show Figure TEMs of GdF nanocrystals (A) Overview graph of single nanocrystals and “stacks” (B) Blow-up of self-assembled...

Ngày tải lên: 21/06/2014, 04:20

... CNFs using C2H2 and NH3 feedstocks in a dc PECVD reactor The partial dissociation of C2H2 and NH3 led to the formation of H2, HCN, H2O and N2 species The presence of excited neutral and ionized species ... during the synthesis of CNFs but there is still a lack of information on the actual surface reaction of the catalysts The synthesis of carbon nanotubes or nanofibres requires temperature of 700–1,000°C ... temperature synthesis of VA-CNTs Large-scale Monte Carlo simulations [37] of SWNT synthesis showed that PECVD methods were more suitable for low temperature synthesis and had two orders of magnitude...

Ngày tải lên: 21/06/2014, 07:20

... 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 ... 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 ... presence of mostly nanodiscs, having diameter between 40 and 65 nm, with a very few number of spheres The histogram of nanodiscs distribution (Fig 2b) shows that majority of discs have a diameter of...

Ngày tải lên: 21/06/2014, 17:20

... ratios of nickel/oxygen in the NiO fibers and zinc/oxygen in the ZnO fibers are near to the theoretical ratio of NiO and ZnO of 1:1 The XRD patterns of the NiO and ZnO fibers are presented in Fig 5a and ... pressure during removal of the core templates The adoption of high heating rate of 10 K/min results in rapid oxidation of the PAN fiber templates and release of a large amount of gases during short ... range of 20 to 35 nm, and the ZnO submicrofibers are composed of many nanocrystallites with a width of about 65 nm and length of about 200 nm Interestingly, both the NiO and ZnO fibers exhibit...

Ngày tải lên: 22/06/2014, 01:20

... ˚ and c = 6.671(4) A The average particle size is estimated to be of the order of 40 nm The criterion adopted for evaluating the rightness, reliability of the indexing and the P P structure of ... importance of titanium and environmental issues related to the production of nanopowders, the present work reports an eco-friendly biotechnological approach for the synthesis (lactobacillus assisted) of ... 2:248–250 Materials and methods Nanoparticles of Ti were prepared using the procedure adopted by Nair and Pradeep [8] with slight modifications The filtrate was diluted times and pH of the culture solution...

Ngày tải lên: 22/06/2014, 18:20

... 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 in Fig 3a and b It ... MWNTs band), mainly due to defects [20] is also observed Raman spectra for SWNTs show the presence of RBM, at 388.9 cm–1, in addition to the G- and Dbands The increase in the intensity of D-band ... decomposition of methane over Ni–Cu–MgO catalyst [24] Since the morphology of deposited carbon and the methane decomposition rate depend on the structure and nature of the active catalytic sites and the...

Ngày tải lên: 22/06/2014, 22:20

... interaction of irradiation time with microwave power (a), sieve number (b) and modifier volume (c) on the extraction efficiencies of curcumin 3.3.2 Influence of interaction of grinding degree and microwave ... concentration of stock solutions of standard curcumin, to a pre-analyzed crude extract Recovery values of curcumin obtained were 98.35, 96.86 and 99.13% V Mandal et al / Journal of Pharmaceutical and ... extraction efficiency of curcumin (b) The effect of the interaction of modifier volume with microwave power on extraction efficiency of curcumin (c) The effect of the interaction of modifier volume...

Ngày tải lên: 01/07/2014, 13:23

... RESULTS AND DISCUSSION 3.1 Microwave- assisted extraction 3.1.1 Effect of ethanol concentration on the extraction of polyphenols Ethanol was employed in experiment because it is non-toxic and inexpensive ... and effects of polyphenols in chocolate, qualitative and quantitative analys of polyphenols in chocolate and chocolate raw products as well as evaluation of potential implications of chocolate ... (82.46 %) of MAE for minutes radiation (18 total time of extraction) higher than that of ultrasound -assisted extraction in 60 minutes, conventional heating reflex extraction in 60 minutes and extraction...

Ngày tải lên: 22/07/2014, 10:21

... SAPK/JNK (p46 and p54), particularly the level of the p46 isoforms Diacerein and rhein, however, had no effect on the activation level of either kinase Figure Effect of diacerein and rhein on ... acquisition of data, analysis and interpretation of data, manuscript preparation, and statistical analysis J-PP participated in study design, analysis and interpretation of data, and manuscript ... study design, analysis and interpretation of data, manuscript preparation, and statistical analysis SKT participated in acquisition of data, analysis and interpretation of data, and manuscript preparation...

Ngày tải lên: 09/08/2014, 10:23

... that the presence and size of product bands interactions Validation of ReAnoCDS05 predictions by RT-PCR unambiguously verify one of the CDS predictions Maps of the ReAnoCDS05 and Ensembl CDS predictions ... comparison of ReAnoCDS05 and Ensembl based on a set of full-length cDNA sequences Manual comparison of ReAnoCDS05 and Ensembl based on a set of full-length cDNA sequences The charts show the analysis of ... left side of each panel is a map of CDS predictions and supporting lines of evidence, and the right side is a reverse-color image of, from left to right lanes, PhiX/Lambda DNA size standard (Ph),...

Ngày tải lên: 14/08/2014, 16:21

... year-season, stage and number of lactation and cows; that of the Brown Alpine herd, year-season, stage and number of lactation, sire of the cow and genotypes at loci (in the case of the a,,-Cn expression, ... composed of more than 60% haemoglobin A and less than 40% of haemoglobin S (Wellis and Itano, 1951; Wrightstone and Huisman, 1968) Such different rates of expression of globin genes appear to be even ... proteins after removal of a-lactalbumin (Sluyterman and Elgersma, 1978) The separation of the two genetic variants achieved by chromatofocusing (Sluyterman and Wijdenes, 1978) Purity and homogeneity...

Ngày tải lên: 14/08/2014, 20:20