the culture of actual hepatoma cells instead of cancer cell lines could also be undertaken this would give a better insight into how these materials would perform in real life applications in respect to supporting actual liver growth and function
Carbon nanotubes modification and application
... heating and H2-plasma treating, and (b) heated then followed by H2-plasma (c) SEM images and (d) Raman spectrum of the VACNTs synthesized using simultaneous H2 plasma etching and heating Catalyst ... fullerenes: TiO2 and BN nanotubes have also been synthesized and investigated They have shown better H2 storage than carbon nanotubes c) Decoration of carbon nanotubes with metallic nanoparticles and enzymes, ... Localized density of states (LDOS) of bamboo-shaped (10,0) nanotube (a) and armchair (12,0) naontube (b) A- to- M and N -to- V are the label of the carbon rows in the (10,0) tube (see Fig 3.1 5a) and...
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The Science and Technology of Carbon Nanotubes potx
... (a2 ) the initial stacking at q0 was ABAB whereas in (b), (bl) and (b2) the initial stacking was random (a) The normal incidence pattern has a centre of symmetry only (al) (a2 ) The cusps are of ... spectra of graphite and tubes in (b) normal geometry (the electron beam normal to the c-axis) and in (c) parallel geometry (the electron beam parallel to the c-axis of graphite and perpendicular to ... as the origin of the azimuth the stacking is assumed to be well ordered and of the graphite type: ABAB , ABCABC or AAA We inquire how this stacking changes with azimuth due to the systematic...
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Deposition of carbon nanotubes on si nanowires by chemical vapor deposition
... nanowire with a part of the core transformed into b-SiC and coated with a sheath of CNTs b-SiC nanowires and graphitic carbon, as shown in the top image in Fig 4b The characteristics of carbon deposition ... carbon layers It had been noticed that two kinds of nanowires shown in Fig 3a, b were from the same specimen This case was owing to the poor thermal contact between the nanowires themselves and ... layers could not self-organize into nanotubes completely and bucked to form many feather-like sheets on the nanowire surface, as shown in the upper image in Fig 4a A typical nanowire in high magni®cation...
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purification of carbon nanotubes
... crucially on the flow rate of oxidant, the amount of initial sample, the manner of packing of the carbon, and the quality of the cathodic soot Although MWCNTs can be purified by a variety of gas phase ... by this method In laser ablation for producing CNTs, an intense laser beam is used to ablate/ vaporize a target consisting of a mixture of graphite and metal catalyst in a flow of inert gas This ... than SDS as there is a large surface area of phosphate backbone which interacts with water, while similarly there are many bases to bind the CNTs The advantage of this process is that it can always...
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Mechanical Properties of Carbon Nanotubes potx
... The adhesion forces tend to flatten the bottom of the tubes so as to increase the area of contact At the same time, there is an increase in the curvature of the tube and therefore a rise in strain ... cylinders to each other [59] Similarly, a crystal-array [68] of parallel nanotubes will flatten at the lines of contact between them so as to maximize the attractive van der Waals intertube interaction ... 1.02 TPa of graphite and using the standard beam deflection formula one can calculate the bending of the nanotube under applied external force In this case, the deflection of a cantilever beam of length...
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electrical and thermal interface conductance of carbon nanotubes grown under dc bias voltage
... to 50 sccm of H2 After attaining steady state, the H2 plasma was ignited using a microwave power of 200 W, and sccm of CH4 was fed into the chamber for 20 The chamber was evacuated and then allowed ... electrical characteristics, the thermal behavior of the CNT arrays was also determined using a PA technique Figure shows the variation of thermal interface resistance of CNT arrays with the dc bias ... 0.1 V Each data point shown was the average of 50 measurements at the same voltage The resistance of each individual CNT sample was determined from the slope of a least-squares fit line to the resulting...
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applied physics of carbon nanotubes, 2005, p.361
... brackets in (1.1) are replaced by en(x)Ct with Ct being the nanotube total capacitance derived in [22] To obtain this total capacitance one has to go beyond the classical approximation In this section ... both the conduction band bottom and the valence band top shift away from the original Fermi point k = and the gap closes At fields larger than the critical field the gap opens again The critical ... image charge The separation between the SWNT axis and the surface of the conductor is h In the case of the metallic substrate it is about the nanotube radius, R, plus the Van der Waals distance...
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Báo cáo hóa học: " The application of carbon nanotubes in target drug delivery systems for cancer therapies" docx
... deliver therapeutic agents into the cytoplasm and, in many cases, into the nucleus The intrinsic spectroscopic properties of CNTs, such as Raman and photoluminescence, afford additional advantages ... MWCNTs have been used as cellular carriers of recombined ricin A chain protein toxin (RAT) for tumor targeting The complexes of RAT and MWCNT were capable of translocating in the cytoplasm of various ... oxygen-radical scavengers are added to the system The assay readout can be compared to the radical scavenging ability of a known radical scavenger, Trolox, a vitamin E derivative The radical scavenging ability...
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Báo cáo hóa học: " Thermal conductivity of carbon nanotubes and graphene in epoxy nanofluids and nanocomposites" pptx
... hydroxyl and carbonyl, that act as scattering points on the surface where phonons can be transferred from the nanotube crystalline structure into the insulating polymer matrix This behavior has already ... reaching a 70% improvement at wt.% loading The better performance of MWNTs can be due to their lower specific surface area [SSA], as compared with SWNTs, and to the presence of the internal layers ... of at least six measurements for each sample On the other hand, the thermal conductivity of the cured samples was measured using a hot disk apparatus This method was based on a heat balance in...
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Báo cáo hóa học: "Synthesis of carbon nanotubes with and without catalyst particles" doc
... participated in some of the studies and participated in the drafting of the manuscript All authors read and approved the final manuscript Competing interests The authors declare that they have ... nanotubes in integrated circuit manufacturing, however, many of the questions raised in understanding carbon nanotube growth are directly relevant to graphene also Abbreviations CNT: carbon nanotubes; ... MA, MoberlyChan WJ, Shaw EJ, Schlogl R, Hart AJ, Hofmann S, Wardle BL: Nanoscale Zirconia as a Nonmetallic Catalyst for Graphitization of Carbon and Growth of Single- and Multiwall Carbon Nanotubes...
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Báo cáo hóa học: " Plasma-Assisted Synthesis of Carbon Nanotubes" pot
... temperature of the plasma, and there was no plasma-heating effect at W so that the formation of sp linear carbon chains was generated in the carbon plasma Thus, a fraction of the sp linear carbon chains ... the presence of very intense plasma spots was observed in the c-mode which induced plasma-heating effects of the catalysts and damaged CNTs The mode of the plasma had great impact on the synthesis ... potential of the insulating surface (Vf) coupled to the plasma potential (VP) via the sheath: Vf = Vp – Vsh, where VP and Vsh is the potential of the plasma and plasma sheath, respectively Law et al...
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Báo cáo hóa học: "Exploring the Immunotoxicity of Carbon Nanotubes" ppt
... effects may also be important in case of CNTs CNTs have an unusually large surface area/mass ratio The large surface area gives the particles a greater area to contact with the cellular membrane and ... TNF -a, and IL-8 are key in ammatory mediators when macrophages are activated Interestingly, after CNTs were taken up by murine and rat macrophage cells, no in ammatory mediators such as NO, TNF -a, ... production and release of proinflammatory (tumor necrosis factor -a, interleukin-1h) to anti -in ammatory profibrogenic cytokines (transforming growth factor-b, interleukin-10) The in ammatory and fibrogenic...
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Báo cáo hóa học: " Aggregate structure of hydroxyproline-rich glycoprotein (HRGP) and HRGP assisted dispersion of carbon nanotubes" doc
... motifs that function in intra- and intermolecular crosslinking Indeed, using a synthetic gene approach we recently expressed in tobacco cells a simple arabinosylated HRGP analog containing 20 tandem ... contains 20 tandem repeats each containing a long hydrophilic stretch of monogalactosylated serine and arabinosylated hydroxyproline Dispersion of SWNTs in YK20 solutions About mg of HiPCO carbon ... complex through the blocks of hydrophilic amino acids (Ser and Hyp) and the abundant glycans that bind water The details regarding the YK20 configuration around SWNTs demands atomically resolved...
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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
... 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 ... TEM and HRTEM images of SWNTs obtained at a growth temperature of 950°C are respectively shown in Fig 3a and b It can be seen that SWNTs are of larger diameter of around nm Alloy filling inside ... increase in total surface area by providing fresh surfaces, which further enhance the catalytic reactivity and active sites for the formation of CNTs We have also analysed the outlet gas during...
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The Science and Technology of Carbon Nanotubes III ppt
... (a2 ) the initial stacking at q0 was ABAB whereas in (b), (bl) and (b2) the initial stacking was random (a) The normal incidence pattern has a centre of symmetry only (al) (a2 ) The cusps are of ... spectra of graphite and tubes in (b) normal geometry (the electron beam normal to the c-axis) and in (c) parallel geometry (the electron beam parallel to the c-axis of graphite and perpendicular to ... as the origin of the azimuth the stacking is assumed to be well ordered and of the graphite type: ABAB , ABCABC or AAA We inquire how this stacking changes with azimuth due to the systematic...
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The Science and Technology of Carbon Nanotubes pptx
... (a2 ) the initial stacking at q0 was ABAB whereas in (b), (bl) and (b2) the initial stacking was random (a) The normal incidence pattern has a centre of symmetry only (al) (a2 ) The cusps are of ... spectra of graphite and tubes in (b) normal geometry (the electron beam normal to the c-axis) and in (c) parallel geometry (the electron beam parallel to the c-axis of graphite and perpendicular to ... as the origin of the azimuth the stacking is assumed to be well ordered and of the graphite type: ABAB , ABCABC or AAA We inquire how this stacking changes with azimuth due to the systematic...
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Chemistry of Carbon Nanotubes phần 3 potx
... provide internal cavities (2-10 nm in diameter) that are capable of accommodating biomolecules of suitable size It has been shown that small proteins, such as lactamase, can be inserted into the internal ... the inserted lactamase remained catalytically active, implying that no drastic conformational change had taken place DNA could also enter into the CNT cavities, and DNA transport has been directly ... Suenaga, K.; Okazaki, T.; Hirahara, K.; Bandow, S.; Kato, H.; Taninaka, A. ; Shinohara, H.; Iijima, S Appl Phys A 2003, 76, 445 (g) Suenaga, K.; Okazaki, T.; Wang, C.-R.; Bandow, S.; Shinohara,...
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Comprehensive molecular dynamics simulations of carbon nanotubes under axial force or torsion vibration and new continuum models
... based carbon fiber A comparison of mechanical, electrical, and thermal properties between CNTs and conventional fiber materials are given in Table 1.2 and Table 1.3 These tables display that the ... behaves plastically at a high temperature and low strain rate This is because, at a high temperature and under a slow strain rate the formation of defect is facilitated which allows a gradual ... hope to carry out the research work I would also like to thank Dr Adrian Koh of the Department of Mechanical Engineering for helping me to enrich my analytical and critical thinking capabilities...
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Processing and applications of carbon nanotubes and graphene
... contribution in the fabricating and characterization of the dye sensitized solar cells I am grateful to the lab technicians in the department of materials science and engineering for their trainings and ... [102-104] These functional groups increase the distance between graphite layers and weaken the inter-plane van der Waals interactions Thus the graphite oxide can be easily exfoliated into monolayer nanosheets ... 2.3.6 Photovoltaic performance characterization The photovoltaic performance of the DSC was measured by applying a scanning potential bias V to the cell and measuring the generated photocurrent...
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