emancipation however a sense of tragedy lurks behind the processes of mimicry and hybridity in the case of philippine basketball the lack of resources that prevents the local leagues to expand their market base across the co

Carbon nanotubes modification and application

Ngày tải lên : 12/09/2015, 09:28

... 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 ... with a tensile strength of 1.8Gpa, which matches that of spider silk A comparison of the strength and failure strain for CNT composite fibers and 3000 materials in the database of Cambridge Materials ... storage of carbon nanotubes is probably due to poor National University of Singapore 19 Chapter Literature Background characterization of carbon nanotubes and lack of understanding fundamental...

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The Science and Technology of Carbon Nanotubes potx

Ngày tải lên : 05/03/2014, 17:20

... (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 ... (a, b,c) The spots A and B as well as C and D approach one another In (d) the spots A and B coalesce In (9 the spots C and D form a single symmetrical streak The positions of the spots 00.1 remain ... the hard shell increases and that of the MWCNT decreases To keep the arc discharge stable and the electrode cool are effective to increase in the product quantity of MWCNT A considerable quantity...

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Deposition of carbon nanotubes on si nanowires by chemical vapor deposition

Ngày tải lên : 16/03/2014, 15:04

... 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 ... original silicon dioxide layer on the Si core disappeared, presumably due to the etching eect of atomic hydrogen in the plasma Fig 3b showed a nanowire with the b-SiC core and a sheath of only a ... carbon particles were also found to co- exist during the carbon coating processes Fig 2b showed a TEM image of the same sample and its corresponding SAED pattern The diraction rings of crystalline...

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purification of carbon nanotubes

Ngày tải lên : 20/03/2014, 13:06

... 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 ... foreign materials such as catalyst, amorphous carbon, and carbon-coated nanoparticles, the sorting of SWCNTs according to their length becomes particularly important in light of their potential applications ... 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

Ngày tải lên : 24/03/2014, 05:20

... 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 ... necessary for the helix to form (unlike the local flattening in the case of an axial load) In the above discussion, the specific values of the parameters C and D (or Y and h) are chosen to achieve the ... model of the carbon nanotube-matrix It has also to be remembered that the authors [72] interpret the contrast bands in HRTEM images as the locations of failure, although the imaging of the carbon...

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electrical and thermal interface conductance of carbon nanotubes grown under dc bias voltage

Ngày tải lên : 06/05/2014, 08:53

... 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 ... V and 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 ... composition in the near-surface region was calculated after the subtraction of a Shirley-type background and taking into account the corresponding Scoﬁeld atomic sensitivity factors and empirically...

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applied physics of carbon nanotubes, 2005, p.361

Ngày tải lên : 04/06/2014, 14:50

... 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 ... the separation between the conduction and valence bands, and therefore the optical gap In a similar way, as the atomic size (atomic number) of an element in the Periodic Table solely defines the ... has two subbands crossing at the Fermi-point (Fig 1.3 right) In this case the SWNT is metallic (ii) The zigzag/chiral nanotube of a certain diameter and chirality has subbands that are separated...

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Báo cáo hóa học: " The application of carbon nanotubes in target drug delivery systems for cancer therapies" docx

Ngày tải lên : 20/06/2014, 22:20

... the mechanisms for their pharmacological and toxicological effects The understanding of the pharmacological mechanisms makes it possible to take the advantage of CNTs to the outmost and to avoid ... 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 of the composite ... 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...

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Báo cáo hóa học: " Thermal conductivity of carbon nanotubes and graphene in epoxy nanofluids and nanocomposites" pptx

Ngày tải lên : 20/06/2014, 23:20

... had a waiting time of 30 s until the sample temperature was stable and heated up the sample for 30 s Then, it was used to monitor the cooling rate and calculate the thermal conductivity with an ... 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 ... here was carried out in collaboration between all authors MMG carried out the synthesis and characterization of nanofillers and nanocomposites, participated in the discussion, and drafted the manuscript...

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Báo cáo hóa học: "Synthesis of carbon nanotubes with and without catalyst particles" doc

Ngày tải lên : 21/06/2014, 04:20

... use, as is the case for TEM and XPS in situ studies Moreover, in in situ TEM only tiny sample sizes are examined and in the case of XPS in situ examinations, as already discussed above, the technique ... micrographs showing cross section view of a CNT root at the support surface The (Co) catalyst particle resides in the core of the tube The fringes at the base of the particle correspond to the (200) ... and probably occurs through surface diffusion processes In the case of very small (

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Báo cáo hóa học: " Plasma-Assisted Synthesis of Carbon Nanotubes" pot

Ngày tải lên : 21/06/2014, 07:20

... 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 ... dominated by the ion ﬂux The reduction of incoming ion ﬂux was essential to the synthesis of high quality SWNTs in a plasma sheath On the basis of Eqs and 2, there is always ion bombardment in a...

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Báo cáo hóa học: "Exploring the Immunotoxicity of Carbon Nanotubes" ppt

Ngày tải lên : 22/06/2014, 01:20

... ratio The large surface area gives the particles a greater area to contact with the cellular membrane and proteins, as well as a greater capacity for absorption and transport of bioactive substances ... structure, and surface all play a role in defining nanotoxicity The aggregation status and p–p electronic effects may also be important in case of CNTs CNTs have an unusually large surface area/mass ratio ... 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

Ngày tải lên : 22/06/2014, 22:20

... 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 ... 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 microscopy techniques and ... 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...

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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

Ngày tải lên : 22/06/2014, 22:20

... of Zr, Cr, Fe and Ni; the constituents of the alloy, with a composition comparable to that of the initial alloy used for the preparation of hydride catalysts Figure 2b shows the EDX spectra of ... 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 ... signiﬁcantly reduced with increasing temperature The peak corresponding to water is due to the moisture from the water trap used at the gas outlet of the CVD apparatus Presence of small amount of argon...

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The Science and Technology of Carbon Nanotubes III ppt

Ngày tải lên : 27/06/2014, 17:20

... (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 ... (a, b,c) The spots A and B as well as C and D approach one another In (d) the spots A and B coalesce In (9 the spots C and D form a single symmetrical streak The positions of the spots 00.1 remain ... the hard shell increases and that of the MWCNT decreases To keep the arc discharge stable and the electrode cool are effective to increase in the product quantity of MWCNT A considerable quantity...

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The Science and Technology of Carbon Nanotubes pptx

Ngày tải lên : 27/06/2014, 18:20

... (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 ... (a, b,c) The spots A and B as well as C and D approach one another In (d) the spots A and B coalesce In (9 the spots C and D form a single symmetrical streak The positions of the spots 00.1 remain ... the hard shell increases and that of the MWCNT decreases To keep the arc discharge stable and the electrode cool are effective to increase in the product quantity of MWCNT A considerable quantity...

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Chemistry of Carbon Nanotubes phần 3 potx

Ngày tải lên : 06/08/2014, 13:22

... 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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synthesis of carbon nanotubes and polymers to increase the performance of polymer blends

Ngày tải lên : 14/11/2014, 12:32

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Comprehensive molecular dynamics simulations of carbon nanotubes under axial force or torsion vibration and new continuum models

Ngày tải lên : 09/09/2015, 11:19

... hard times in the last four years, thereby assisting me to progress in my academic career I also want to thank my friends and four-years-roommates Nirmalya Bag, and Shubham Duttagupta for making ... of CNT are superior compared to those of conventional fiber materials and the CNT fibers are also lighter and their transport properties (thermal and electrical conductivity) are also comparable ... results obtained from computational simulation can be used as a guide to plan and conduct an experiment Computational models are broadly classified into atomistic models and continuum models In the...

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Processing and applications of carbon nanotubes and graphene

Ngày tải lên : 10/09/2015, 08:35

... 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 ... dynamic mode The diameter of the cone was 2.5 cm, the cone angle was 0.04 rad, and the gap between cone and plate was 0.5 mm During measurement, the gels were sandwiched between the cone and plate ... strength of pristine graphene are estimated to be as high as TPa and 130 GPa respectively [85] Graphene also has high rigidity as a single atomic layer material Its spring constant is in the range of...

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