phonon structure and raman effect of single walled carbon nanotubes

... spectroscopy applied to single- walled carbon nanotubes Chem Phys Lett 2005, 410:136 Hartschuh A, Qian H, Meixner AJ, Anderson AJ, Novotny L: Nanoscale optical imaging of single- walled carbon nanotubes J ... AJ, Anderson N, Novotny L: Nanoscale Optical Imaging of Excitons in Single- Walled Carbon Nanotubes Nano Lett 2005, 5:2310 11 Roy D, Williams C: High resolution Raman imaging of single wall carbon ... AC, Robertson J: Phonon linewidths and electron -phonon coupling in graphite and nanotubes Phys Rev B 2006, 73:155426 16 Dubay O, Kresse G, Kuzmany H: Phonon Softening in Metallic Nanotubes by a...

Ngày tải lên: 21/06/2014, 05:20

... which represent the existence of SWCNTs are hardly shown The data show no SWCNTs are formed and there are only poorly multi -walled carbon nanotubes (MWCNTs) and organized carbon in the sample The ... intensity of the D band relative to G band (ID/IG = 0.72) indicates mass amorphous carbon content or more defect concentration in the MWCNTs When temperature increases to 800 °C, Raman spectrum of the ... °C, more and more amorphous carbons are formed in the SWCNTs bundles due to the self-decomposition of CH4 The temperature window of SWCNTs efficiently growth is between 800 and 950 °C, and the...

Ngày tải lên: 22/06/2014, 00:20

... purity of the MWNT and the presence of the graphitized layer between the nanotubes and carbon paper in Sample C The absence of the graphitized layer between the MWNT and carbon paper in samples B and ... graphitized carbon paper is a double layer structured gas diffusion layer porous carbon paper which consists of a macroporous layer of carbon fiber paper (SGL, Germany) and a microporous layer of carbon ... ambient air and scanning in the 2h range of 10–90°, in steps of 0.05° X-ray diffraction pattern of DyNi2 alloy shows the formation of single phase with a C 15 type cubic structure XRD pattern of as-prepared...

Ngày tải lên: 22/06/2014, 18:20

... Eriksson, Effect of ozone oxidation on single- walled carbon nanotubes, J Phys Chem B 110 (2006) 7113–7118 J Li, Y Lu, Q Ye, M Cinke, J Han, M Meyyappan, Carbon nanotube sensors for gas and organic ... Individual single- walled nanotubes and hydrogels made by oxidative exfoliation of carbon nanotube ropes, J Am Chem Soc 125 (2003) 9761–9769 N.H Quang, M.V Trinh, B.H Lee, J.S Huh, Effect of NH3 gas ... 65 (2007) 263–268 W.L Yim, J.F Liu, A reexamination of the chemisorption and desorption of ozone on the exterior of a (5,5) single- walled carbon nanotube, Chem Phys Lett 398 (2004) 297–303 N.I...

Ngày tải lên: 19/03/2014, 16:47

... polymerization of phenoxybenzoic acids [11] and functionalization of closely related carbon materials such as vapor-grown multi -walled carbon nanofibers (MWCNFs) [12, 13] and multi -walled carbon nanotubes ... Results and Discussion Without purification, most of the as-prepared SWCNTs contain approximately 60–70 wt% of impurities such as carbonaceous fragments, amorphous carbons, and small amount of graphite ... implies the higher purity of SWCNTs The TEM image of the as-received SWCNTs shows that there are large portions of carbonaceous and metallic impurities (Fig 1c) On the other hand, the PPA treated...

Ngày tải lên: 22/06/2014, 00:20

... nanotubes have 30 Raman- and 18 IR- active phonon modes; all AC-1 BC2N nanotubes have 19 Raman- and 10 IR-active phonon modes; all ZZ-2, AC-2, and other chiral BC2N nanotubes have 33 Raman- and ... of BC2N nanotubes were discussed based on line group All BC2N nanotubes possess nonsymmorphic line groups, just like carbon nanotubes [8] and boron nitride nanotubes [11] Contrary to carbon and ... modes are 19 and 10, respectively, for AC-1 BC2N nanotubes in irrespective of n The numbers of Raman- and IR- active phonon modes for ZZ-1 BC2N nanotubes are almost twice as for AC-1 BC2N nanotubes, ...

Ngày tải lên: 22/06/2014, 01:20

... walled carbon nanotube (b) optimized structure of zig-zag C68B2 single walled carbon nanotube Methods and Results The structures at minimum energy of zig-zag (7,0) and armchair (5,5) tubes are obtained ... energy between the singlet and doublet states The + sign means the triplet state has lower energy than the singlet state Fig (a) Optimized structure of C68B2 armchair single walled carbon nanotube ... (2007) 2:447–449 Table Calculated total energy of singlet and triplet state for boron and nitrogen doped single wall zig-zag and armchair carbon nanotubes Formula Type C68B2 Armchair Method Total...

Ngày tải lên: 22/06/2014, 18:20

... presence of carbon and oxygen on the treated and untreated samples are normalized with respect 123 236 Nanoscale Res Lett (2009) 4:234–239 Fig a SEM and b TEM images of the pristine MWCNTs, c SEM, and ... untreated and treated samples reflect the fact that the effect of gas composition on structural integrity of the nanotubes is insignificant in this case Conclusions In this article, the effects of various ... was shown effective to functionalize multi -walled carbon nanotubes (MWCNTs) with minor negative consequences in nanotube structure [24] In the process, high incident energy hydrogen and oxygen...

Ngày tải lên: 22/06/2014, 01:20

... Y and W135 are the most frequently found in invasive infections The capsule of serogroups B, C, Y and W135 strains is composed of either homopolymers (B and C) or heteropolymers (Y and W135) of ... action of MWCNT in the transformation of serogroup C N meningitidis against two different DNA obtained from isogenic mutants of this microorganism Methods Synthesis of multi -walled carbon nanotubes ... amounts of DNA(1µg) from M2 and M6 mutants, MWCNT (20 µg) and bacterial cells were submitted to action 5U of DNase (New England Biolabs, UK) and further transformation process Also, the counts of...

Ngày tải lên: 11/08/2014, 08:20

... (511) and (440) These planes are indications of the presence of a spinel cubic structure The diffraction lines corresponding to a cubic, spinel-type and crystalline phase provides clear evidence of ... Ni1-xCoxFe2O4 and hence there is increasing of MS (table 3) Another side, it is known that the magnetizing process of hard ferrite consisting of single domain particles is the rotation process of magnetization ... high coercivity of materials, the second term can take part of several tens percent of HC and the last one whereas can only reach several hundreds of gauss Thus, the increasing of Co-concentration...

Ngày tải lên: 13/02/2014, 04:20

... cultivars Nigerian J of Basic and Applied Sci 1988, 2:25-33 Taiwo MA, Akinjogunla OJ: Cowpea viruses: Quantitative and Qualitative effects of single and mixed viral infections African J of Biotech 2006, ... viruses [17] 2.0 Materials and methods 2.1 Sources of viruses and cowpea cultivars/lines (CVS/L) One isolate each of CABMV, CMeV and SBMV and the two cowpea lines (IT86D-719 and TVU 76) used for this ... interaction between CABMV and Cucumber mosaic virus (CMV) genus Cucu movirus reported by Pio- Ribeiro et al., [14] and the quantitative and qualitative effects of single and mixed viral infections...

Ngày tải lên: 18/06/2014, 18:20

... cultivars Nigerian J of Basic and Applied Sci 1988, 2:25-33 Taiwo MA, Akinjogunla OJ: Cowpea viruses: Quantitative and Qualitative effects of single and mixed viral infections African J of Biotech 2006, ... viruses [17] 2.0 Materials and methods 2.1 Sources of viruses and cowpea cultivars/lines (CVS/L) One isolate each of CABMV, CMeV and SBMV and the two cowpea lines (IT86D-719 and TVU 76) used for this ... interaction between CABMV and Cucumber mosaic virus (CMV) genus Cucu movirus reported by Pio- Ribeiro et al., [14] and the quantitative and qualitative effects of single and mixed viral infections...

Ngày tải lên: 20/06/2014, 01:20

... aqueous solutions: chloride, carbonate and phosphate and the combination of them by adding about 0.34 g of ZANDI into a 500 ml of the aqueous solution The accumulated amount of 2,4-D released into ... both ZAN and ZANDI show agglomerates of nonporous, flaky structure, but the latter shows less compact and fluffy granular structure This structure is believed to influence the release profiles of 2,4-D ... micrograph of Zn–Al-LDH (ZAN) and its nanohybrid with 2,4-D (ZANDI) accumulated release of 2,4-D/% percentage at 99% compared to phosphate and chloride with a value of 93 and 25%, respectively Carbonate...

Ngày tải lên: 22/06/2014, 00:20

... prices “over and beyond” what such changes imply for the path of aggregate demand and inflation (Borio and Lowe 2002, Cecchetti et al 2000) Proponents of this policy emphasise that episodes of financial ... to offset the macro economic effects of the collapse of the bubble).2 Of course, it is by no means clear that central banks are better able to judge the appropriate level of asset prices and ... precision of the estimates, we thus follow Goodhart and Bean (2004) and Kohn (2006) discuss the implications of lags for the use of monetary policy in the face of asset price bubbles Sutton (2002) and...

Ngày tải lên: 24/10/2012, 09:40

... Journal of Accounting and Economics 11, 143-81 Demsetz, H., 1964 The exchange and enforcement of property rights Journal of Law and Economics 3, 1-44 Demsetz, H and K Lehn, 1985 The structure of ownership: ... determinants of corporate share ownership structures.4 The literature emphasizes the roles of customs, social norms, and law and legal systems in shaping the structure of property rights and their ... find ownership effects in several economies The effect of V on earnings informativeness is negative and significant in Hong Kong, Malaysia, and Taiwan The effect of CV is positive and significant...

Ngày tải lên: 18/02/2014, 01:20

... the structure of peptide cER consists of two b-turns, located at the N- and C-termini A comparison of the b-turn structure of cER with the similar region in the crystal structure of rat and human ... bonds between NH of Thr5 and CO of Arg2, as well as NH of Arg2 and CO of Thr5 Structure of cyclic hexapeptides – cYT peptide The NMR data of the cYT peptide were indicative of its flexible nature ... the peptide and the proximity of amide protons due to compact nature of the structure However, the coupling constant of most of the amide protons was in the range of 6–8 Hz, suggestive of rapidly...

Ngày tải lên: 19/02/2014, 13:20

... Fragments of HSQC and HMBC spectra of compound Labels illustrate assignment of the amide linkage between the amino group of Asp and the carboxyl group of GalA residue E Scheme The structures of oligosaccharides ... present in the products and were identified, and the ratio of structures and was close to : All chemical shifts remained mostly unchanged with the exception of H/C-2 and H/C-3 of the glycerol residue ... the linkage position, and between H-1 of a monosaccharide and H-5 of a glycosylating residue in the event of an a-(1–2)-linkage Respective HMBC correlations between H-1 and a carbon at the transglycosidic...

Ngày tải lên: 19/02/2014, 16:20

... attributed to bH of Ala12 and NH of Val15, and aH of Pro13 and NH of Val15 Ó FEBS 2004 Structural study of internal fusion peptide of ASLV (Eur J Biochem 271) 4733 Conformational alteration of IFP–wt ... and internal FPs, in the hope of improving our understanding of the role of fusion peptides in the fusion event Structure and membrane interaction of IFP–wt Binding of IFP–wt to lipid vesicles ... self-assembly of the envelope glycoprotein of ASLV bound to membrane Effects of pH on the secondary structure and membrane interaction of IFP–wt Based on studies on the molecular clustering of EnvA...

Ngày tải lên: 19/02/2014, 16:20

... present analysis of enzymatic properties of ChiG, or by our analysis of the ChiG and ChiC structures Despite the deletion of the B-loop, the two putative catalytic residues Glu68 and Glu77 are structurally ... (GlcNAc)3 and (GlcNAc)2; the 80 : 20 anomeric ratio of the products indicates that cleavage after sugar or sugar occurs approximately equally often Structure The overall structure of ChiG (Fig ... extension of eight and seven residues respectively (Fig 1) The N-termini of the plant enzymes and the first residue in the ChiG structure (Phe12) (Fig 4A), are located on the opposite side of the...

Ngày tải lên: 07/03/2014, 11:20

... Fig NMR structure of the XPCB domain of hHR23B (A) Stereoview of the 12 superimposed structures of XPCB–hHR23B All Pro residues conserved among the STI1 homologs are marked in blue, and the Pro ... presentation of the XPCB–hHR23B three-dimensional structure (C) Seven structures of XPCB–hHR23B (yellow) and of XPCB–hHR23A (green, from Walters et al [13]) are superimposed The red and blue residues ... XPCB– hHR23B and XPCB–hHR23A The side chains of residues with orientations that differ between hHR23B and hHR23A are shown Also, b-N and b-C are the N- and C-termini of XPCB–hHR23B; a-N and a-C are...

Ngày tải lên: 07/03/2014, 17:20