carbon nanotubes as nanofillers

... nanoparticles Part II. Carbon nanotubes as nanofillers Flame retardant behaviour by Cone Calorimetry The crack density decreases in the order : nanotubes > organoclays > nanotubes – organoclays ... Energy source categorizes CVD : thermal CVD, Hot filament plasma CVD, Microwave plasma CVD, RF plasma CVD, etc. Different carbon nanotubes Nanotubes % impurities number of sheets Length Diameter Long ... behavior Thermal properties : « stability » and flame retardant behavior Interest of carbon nanotubes as nanofillers Thermogravimetric Analysis of Binary Compositions : EVA + MWNT’S EVA Shift...

Ngày tải lên: 23/10/2013, 19:15

... elaboration of a new gas sensitive composite materials technology was afterwards reported. A new approach was intro- duced when room temperatures detection of hazardous gases was desired, consisting ... nanoparticles was 50–100 nm. Novel hybrid composites were fabricated by embedding a low amount of carbon nanotubes into the hex-WO 3 matrix. Metallic nanoclusters (Ag, Au) were added to the carbon nanotubes for ... WO 3 1/3H 2 O “mother” phase, and (b) hexagonal WO 3 phase. treatment in an autoclave at 125 ± 5 ◦ C. The resulted powder was dried in a desiccator, and after that was heat treated (anneal- ing...

Ngày tải lên: 20/03/2014, 13:05

Ngày tải lên: 22/06/2014, 18:20

... properties, was reported. The effect of water-soluble derivatives [C 60 (OH) x and C 60 (NEt) x ] was studied on human mast cell (MC) and peripheral blood basophils (PBB). The cell growth was regular ... internalised inside the cell by carbon nanotubes. Preliminary results have shown that MTX conjugated to the CNTs is as active as MTX alone in a cell culture assay (Prato et al., 2008). The ... and their interactions with cells by masking the CNT structure (Nimmagadda et al., 2006). 2.4 Carbon Nanotubes and Immunological Response 2.4.1 Carbon Nanotubes for Peptide Delivery In recent...

Ngày tải lên: 17/02/2014, 05:20

... whereas the second encompasses vapor-grown car- bon fibers and PCNTs produced by pyrolytic processes. A third possibIe class would be polymer-based nano- tubes and fibers such as PAN-based carbon ... VAPOR-GROWN CARBON FIBERS AND PYROLYTIC CARBON NANOTUBES Vapor-grown carbon fibers have been prepared by catalyzed carbonization of aromatic carbon species using ultra-fine metal particles, such as ... diameters as small as 55 A, and inner diameters as small as 23 A, and a nanotube consisting of only two coaxial cyknders [2]. This paper was important in making the connection between carbon...

Ngày tải lên: 05/03/2014, 15:21

... Among the several known types of carbon fibres the discussion in this chapter is limited to the electric arc grown multi-walled carbon nanotubes (MWCNTs) as well as single-walled ones (SWCNTs). ... Multi- Walled and Single-Walled Carbon Nanotubes M.Yumura 2 Chapter 3 Electron Diffraction and Microscopy of Carbon Nanotubes S. Amelinckx, A. Lucas and P. Lambin 14 Chapter ... Multi-Walled and Single- Walled Carbon Nanotubes. EELS Study T. Hanada, Y. Okada and K. Yase 29 Chapter 5 Electronic Structure of Single-Walled Carbon Nanotubes K. Tanaka, M. Okada...

Ngày tải lên: 05/03/2014, 17:20

... temperature of deposition was as high as 1100°C, the carbon layers bucked openly to form many feather-like carbon sheets sprouting from the surface of the nanowires. A mixture of large carbon sheets and ... of the carbon network sheathed on the nanowires. When the substrate temperature was relatively high (b1100°C), a mixture of graphitic carbon and SiC nanowires was formed because of both the carbonization ... carbon on the surface of Si NWs was slow and if a carbon nucleation happened on a nanowire surface, it was possible that a carbon tube-like network formed around the nanowire. As the diameters of the nanowires...

Ngày tải lên: 16/03/2014, 15:04

... case of sample 1, the sensor response was 9.8% for 500 s. In comparison, sample 2 was saturated within almost a 100 s after exposure to ozone gas. It was recognized that the sensor response was ... distinguish. As the con- centration of the ozone gas introduced to the chamber increased, the variation of the sensor resistance also increased. When 50, 100, 200, and 500 ppb of ozone gases were ... ozone down to 50 ppb. Upon exposure to ozone gas, the resis- tance of the SWCNT-based sensor decreased with an increase in concentration of the ozone gas, which states that the SWCNTs have p-type...

Ngày tải lên: 19/03/2014, 16:47

... since the past decades owing to their advantages of high sensitivity to pollutant gases, fast response and recovery, low cost, easy implementation, and small size [1,2]. Gas sensors based on SnO 2 materials ... SnO 2 –TiO 2 Carbon nanotubes Gas sensor abstract TiO 2 and SnO 2 are the well-known sensing m aterials with a good thermal stability of the former and a high sensitivity of the latter. Carbon nanotubes ... sensitive at a temperature around 380 1C. As described in the previous section, the CNTs inclusion has caused no obvious differences in surface morphology as well as particle size. Consequently, the...

Ngày tải lên: 20/03/2014, 13:04

... multi- walled carbon nanotubes was originally performed to open the tips and to fill the cavities of carbon nanotubes [112, 113]. In order to covalently decorate the outside surface of multi-walled carbon ... designing photocatalytic composite nanoparticles using carbon nanotubes as a core and TiO 2 as a shell. Contact of metallic multi-walled carbon nanotubes with the semiconductor indirectly influences ... of surface functionalized multi-walled carbon nanotube 46 3-2. SEM images (a) anatase nanocoated carbon nanotubes and (b) anatase coating fragments after carbon nanotube burn-out, and (c) TGA/DTA...

Ngày tải lên: 20/03/2014, 13:06

... conductance of the gas sensor decreases from its origina l electrical potential to the electrical potential due to adsorption. As the ethanol gas was removed, conductance of the gas sensor was lost. Similar ... ethanol gas. 2. Experimental In this work, microwave plasma enhanced chemical vapor deposition (MPECVD) was used to synthesize the carbon nanotubes. An iron-containing compound was used as the ... 12 November 2008 Keywords: Carbon nanotubes Ethanol Conductance Gas sensor Adsorption Surface modification Carbon nanotubes (CNTs) have been fabricated by microwave plasma-enhanced chemical vapor...

Ngày tải lên: 20/03/2014, 13:06

... 2001;1(9):487–9. [104] Yudasaka M, Ichihashi T, Kasuya D, Kataura H, Iijima S. Structure changes of single-wall carbon nanotubes and single-wall carbon nanohorns caused by heat treatment. Carbon 2003;41(6):1273–80. [105] ... of double-walled carbon nanotubes by heat treatment. Chem Phys Lett 2004;398(1–3):87–92. [103] Yudasaka M, Kataura H, Ichihashi T. Diameter enlargement of HiPco single-wall carbon nanotubes by heat ... the DNA-assisted purification of single-walled carbon nanotubes. Phys Status Solidi A 2007;204(6):1791–6. [97] Klumpp C, Kostarelos K, Prato M, Bianco A. Functionalized carbon nanotubes as emerging...

Ngày tải lên: 20/03/2014, 13:06

... was mixed with 4–6 drops of Triton-X to obtain the screen-printing paste. In the case of TiO 2 powder , 0.5 g were mixed with 10–20 drops of propylene glycol to obtain the paste. Corning glass ... dip-coated films. (1) As received MWCNT, (2) acid treated MWCNT, (3) TiO 2 , (4) TiO 2 :MWCNT. CNT/Multiwall carbon nanotubes; A, anatase; B, brookite; R, rutile. 4. Discussion As explained in Section ... TiO 2 :Multiwall Carbon Nanotubes (MWCNT), and its application as chemical sensors are reported. A sol–gel solution containing Ti-isopropoxide and acid treated MWCNT was either precipi- tated or kept as a...

Ngày tải lên: 20/03/2014, 13:07

... -NANO/ CARBON NANOTUBES (CNTs)/ COTTON    STUDY ON SYNTHESIS OF COMPOSITES CONTAINING Ag-NANO /CARBON NANOTUBES (CNTs)/ COTTON AND ... we have successfully synthesized the “Silver nanoparticles/ Carbon nanotubes/ cotton” composite and designed a water filter system based on this material. The results of this study show that ...        n loi vt liu lc m Ag nano ht phân tán trên carbon nanotubes trên nn vm kt hc tính dit khun tuyt vi ca Ag nano và kh...

Ngày tải lên: 22/03/2014, 17:20

... technique was first used in [71] to measure the Young’s modulus of carbon nanotubes. The amplitude of those oscillations was defined by means of careful TEM observations of a number of nanotubes. ... flatten out and increase considerably their binding energy [by 115% in the case of the (40,40) tube]. In the case of MWNTs, we find that as the number of carbon shells increases, the overall gain ... diameter has been presented by Poncharal et al. [52]. The new technique was based on a resonant electrostatic deflection of a multi- wall carbon nanotube under an external ac-field. The idea was to...

Ngày tải lên: 24/03/2014, 05:20

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Ngày tải lên: 04/06/2014, 14:50