ionization time of flight mass spectrometry maldi tof ms
Carbon nanotubes modification and application
... work……………….………….….………………283 National University of Singapore ix LIST OF FIGURES LIST OF FIGURES Figure 2.1 (a) Definition of chiral vector, Ch, in a hexagonal lattice of carbon atoms by unit vectors â1 and â2, ... form of textiles (see Fig 2.8) The CNT composite fibers are ~50µm in diameter and compose of 60wt% of SWNTs with a tensile strength of 1.8Gpa, which matches that of spider silk A comparison of ... lengths (in Å) of a pure armchair (5,5) nanotube; (b) Direct substitution of two nitrogen atoms into the carbon framework without the formation of vacancies Here the two N substitution atoms in C58N2...
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The Science and Technology of Carbon Nanotubes potx
... dependence of the intensity The radii of the dark circles are given by the zeros of the sums of Bessel functions [17] 3.4.4 Simulation of diffraction patterns [ 17,191 Several sections of the diffraction ... The extent of the deformation of the hexagon depends on the direction of incidence of the electron beam with respect to the tube axis With increasing tilt angle of the specimen pairs of reflexions ... space of a disordered volume element of parallel graphene sheets consists of streaks along the local [ * ]direction, through the hexagonal array of nodes in the local (OO.f)* plane and of a row of...
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Deposition of carbon nanotubes on si nanowires by chemical vapor deposition
... HRTEM image of a nanowire consisting of a crystalline Si core and a sheath of multi-walled CNTs; (b) a nanowire with a part of the core transformed into b-SiC and coated with a sheath of CNTs b-SiC ... formed by carbon atoms diusing into the Si NWs, CNTs could not be formed very well on the surface of nanowires because of both the volume change of the nanowires and breaking of the carbon network ... image of the nanowires with carbon deposition at $1300°C and the higher magni®cation image of a part of the sample in the upper image feather-like carbon sheets sprouting from the surface of the...
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purification of carbon nanotubes
... yield of SWCNTs with nitric acid treatment depend on the concentration of the nitric acid and the time of reflux The treatments of Fig – Mass balance of the normalized weight percentage of all ... reactions of Fe and Ni impurities can be considered as an indication of the extent of removal of the amorphous carbon, and the optimum electrochemical oxidation time for the purification of the as-grown ... chemical properties of CNTs, highly efficient purification of the as-prepared CNTs is, therefore, very important 1.3 Assessment of CNT purity To evaluate the purity of CNTs, the efficiency of a purification...
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Mechanical Properties of Carbon Nanotubes potx
... large systems in the time scales that are characteristic of fracture and plasticity phenomena Systems containing up to 5000 atoms have been studied for simulation times of the order of nanoseconds ... the point of view of elasticity theory, the definition of the Young’s modulus involves the specification of the value of the thickness h of the tube wall In this sense, the large value of Y obtained ... spite of their molecular size, nanotubes obey very well the laws of continuum shell theory [2,39,70] One of the outstanding features of fullerenes is their hollow structure, built of atoms densely...
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electrical and thermal interface conductance of carbon nanotubes grown under dc bias voltage
... the existence of multiple G peaks The quality of the fit in the low-energy and high-energy tails of the D- and G-bands, respectively, is good The assignment of the peak components of the D- and ... spectra of CNTs grown under negative and zero dc bias voltage represent sp3 rich phases of CNTs and suggest the existence of amorphous carbon or defects on the walls of CNTs.31 The absence of a ... intensity of the G-band reflects the degree of graphitization of carbon materials The effect of dc bias voltage on the IG/ID ratio and the FWHM are presented in Figure The line shapes of the G-...
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applied physics of carbon nanotubes, 2005, p.361
... finite density of states of the nanosystem Derivation of this density of states in the presence of external perturbations is a difficult task We present some examples of the modification of the nanotube ... samples of nanotubes of only a few diameters/chiralities It is expected that the development of techniques for the synthesis of a single type of nanotube is not far away At the same time, physical ... scope of the physics of low–dimensional structures is due to strong correlations This is because of the weak screening of the Coulomb interaction in low–dimensional systems Indeed, the lowering of...
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Báo cáo hóa học: " The application of carbon nanotubes in target drug delivery systems for cancer therapies" docx
... construction of drug delivery systems in not too long a time The functionalization of CNTs used in the construction of drug delivery systems will be discussed in later sections In vivo behavior of functionalized ... schematic illustration of the strategy for the preparation of the CNT-based drug delivery systems Figure The modification of CNTs Schematic illustration of modification of CNTs with various molecules ... causes loss of some properties of CNTs, but this shortening are sometimes needed for special purposes such as in the case of CNTs are used as oral drug carriers [10] For studies on the use of CNTs...
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Báo cáo hóa học: " Thermal conductivity of carbon nanotubes and graphene in epoxy nanofluids and nanocomposites" pptx
... as time, applied heat, or cooling time, which will then have a profound effect on the cross-link density and hence, on the final properties of the system Thus, we aimed at studying the effect of ... that MWNTs are the most effective carbon nanofillers to improve the K of liquid resins Indeed, the K of the nanofluids gradually increased as a function of MWNT content, reaching a 70% improvement ... thermal conductivity of epoxy nanofluids We also studied the differences in heat conduction mechanisms using graphene sheets and different types of CNTs analyzing the role of surface functionalization...
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Báo cáo hóa học: "Synthesis of carbon nanotubes with and without catalyst particles" doc
... the core of the tube The fringes at the base of the particle correspond to the (200) lattice fringes of cubic Co The outer walls of the CNT align themselves with the lattice fringes of the a-alumina ... formation of amorphous nanohumps apparently serve as seed sites for the self-assembly of CNT Growth Mechanisms Whilst significant strides have been made in understanding CNT synthesis, the mechanisms ... confirmed oxides are capable of graphitising carbon [40] Hybrid metal/metal-oxide catalyst systems Many of the oxides described above as catalytic nanoparticles for CNT growth are often used as supports...
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Báo cáo hóa học: " Plasma-Assisted Synthesis of Carbon Nanotubes" pot
... Plasma-heating effect of the substrates casts doubts on the credibility of previously reported results of low temperature synthesis of CNTs/CNFs using high plasma power However, plasma power of 200–300 ... low-temperature plasmaassisted growth of CNTs [27, 51], which was similar to the activation energy of surface diffusion of carbon atoms on polycrystalline Ni (0.3 eV) [52] Hoffman et al [51] suggested ... showed the time evolution of the graphitization of SWNTs synthesis due to reactive ion-etching effects The growth kinetics of SWNTs was monitored using Raman spectroscopy whereby the degree of graphitization...
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Báo cáo hóa học: "Exploring the Immunotoxicity of Carbon Nanotubes" ppt
... the interactions of two types of SWNT (1) iron-rich (nonpurified) SWCNT (26% of iron) and (2) iron-stripped (purified) SWNT (0.23 wt% of iron) with RAW264.7 macrophages Each type of SWNT was able ... generation of nanomedicines Available data (Table 2) strongly suggest that CNTs enter cells, cause ROS, and interact with the immune systems A better understanding of the mechanisms of CNTs’ interaction ... eosin staining of mouse lung tissue (a, e) Fluronic F-68-treated group acts as the solvent control (b, f) Early response (3 days) of the mouse lung tissue to a single dose of 0.5 mg of SWNT (c,...
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Báo cáo hóa học: " Aggregate structure of hydroxyproline-rich glycoprotein (HRGP) and HRGP assisted dispersion of carbon nanotubes" doc
... AFM images In the absence of SWNTs, YK20 molecules interact among themselves and form either large condensates of hundreds of nanometers in diameter or open networks of more than lm in size (Fig ... spectrum of SWNT-YK20 complexes multiplied by a factor of 2.25 Thus, the binding of SWNTs imposes some other conformations of YK20, and the polyproline II content in the secondary structure of the ... residues per turn and a pitch of 9.4 angstrom, the length of YK20 is only ~100 nm (320 amino acids) and the entangled network clearly consists of multiple molecules The height of the linear fibril ranges...
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Báo cáo hóa học: "Single step process for the synthesis of carbon nanotubes and metal/alloy-filled multiwalled carbon nanotubes" docx
... 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 ... 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 ... analysis (EDAX) spectra of the alloy-filled MWNTs (Fig 2a) showed the presence of Zr, Cr, Fe and Ni; the constituents of the alloy, with a composition comparable to that of the initial alloy used...
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The Science and Technology of Carbon Nanotubes III ppt
... dependence of the intensity The radii of the dark circles are given by the zeros of the sums of Bessel functions [17] 3.4.4 Simulation of diffraction patterns [ 17,191 Several sections of the diffraction ... The extent of the deformation of the hexagon depends on the direction of incidence of the electron beam with respect to the tube axis With increasing tilt angle of the specimen pairs of reflexions ... space of a disordered volume element of parallel graphene sheets consists of streaks along the local [ * ]direction, through the hexagonal array of nodes in the local (OO.f)* plane and of a row of...
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The Science and Technology of Carbon Nanotubes pptx
... dependence of the intensity The radii of the dark circles are given by the zeros of the sums of Bessel functions [17] 3.4.4 Simulation of diffraction patterns [ 17,191 Several sections of the diffraction ... The extent of the deformation of the hexagon depends on the direction of incidence of the electron beam with respect to the tube axis With increasing tilt angle of the specimen pairs of reflexions ... space of a disordered volume element of parallel graphene sheets consists of streaks along the local [ * ]direction, through the hexagonal array of nodes in the local (OO.f)* plane and of a row of...
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Chemistry of Carbon Nanotubes phần 3 potx
... by TEM One of the most exotic applications of CNT filled with a molten metal was the preparation of miniaturized thermometers The group of Bando described how the height of a column of liquid ... internal cavities of tubes.411 Comparison of the catalytic activities of immobilized enzyme with those of the free species in the hydrolysis of penicillin showed that a significant amount of the inserted ... Chemistry of Carbon Nanotubes of translocation, a prerequisite for nanoscale separation devices 5.3 Encapsulation of Liquids A particular area of interest is the use of carbon tubes in nanofluidics...
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Comprehensive molecular dynamics simulations of carbon nanotubes under axial force or torsion vibration and new continuum models
... 183 Table 7.2: Mass densities of various SWCNTs 184 Table 7.3: Comparison of vibration frequencies of SWCNT using of thick shell and MD 185 xviii LIST OF FIGURES Figure ... Effect of L on τ- response of SWCNT 88 Figure 4.3: Effect of D on τ- response of SWCNT 88 Figure 4.4: Definition of twist direction in chiral SWCNT 89 Figure 4.5: Comparison of ... of CNT depend on length (L), diameter (D), wall number, and θ of SWCNT We show that the Pcr and cr of zigzag SWCNT are greater than the Pcr or cr of its armchair counterpart For the first time, ...
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Processing and applications of carbon nanotubes and graphene
... Oxidization of graphite 25 2.2.6 Exfoliation and reduction of GO 26 2.2.7 Re-dispersion of rGO 27 2.2.8 Preparation of GO films by spin coating 28 2.2.9 Preparation of ... have a purity of > 90%, outer diameter of 1-2 nm, inner diameter of 0.8-1.6 nm, length of ~ 30 µm and specific surface area of > 380 m2/g The MWCNTs (Product Code :TNM2) had a purity of > 95%, outer ... the residual H2O 2.2.9 Preparation of transparent rGO films by the reduction of GO films 30 nm thick Al was deposited onto the GO films at a deposition rate of nm/s using an Edwards Auto 306 thermal...
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