template directed synthesis of carbon nanotube array by microwave plasma chemical reaction at low temperature
photoacoustic characterization of carbon nanotube array thermal interface material
... substrates was observed visually to match the pretest condition We believe that this resiliency is the result of the strong anchoring of the arrays to their substrates enabled by the trilayer catalyst ... study were performed at room temperature, and CNT conductance in the high and low temperature regimes warrants investigation Characterization of the thermal performance of CNT interfaces while an ... density of the array on the Cu sheet are greatly improved because the plasma did not concentrate on the sheet during CNT growth The CNT density of all arrays in this study, determined by counting...
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photoacoustic characterization of carbon nanotube array thermal interface material
... substrates was observed visually to match the pretest condition We believe that this resiliency is the result of the strong anchoring of the arrays to their substrates enabled by the trilayer catalyst ... study were performed at room temperature, and CNT conductance in the high and low temperature regimes warrants investigation Characterization of the thermal performance of CNT interfaces while an ... density of the array on the Cu sheet are greatly improved because the plasma did not concentrate on the sheet during CNT growth The CNT density of all arrays in this study, determined by counting...
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Template directed synthesis of novel supramolecular architectures
... spectra of 2-9d PF6 at various temperatures 62 Figure 2.20 Partial 1H NMR spectra of 2-9b PF6 at various temperatures 63 Figure 2.21 Partial 1H NMR spectra of 2-9c PF6 at various temperatures ... Preparation of CB[6]-based [2]rotaxane by threading-followed -by- stoppering approach Scheme 1.3 15 Synthesis of [2]rotaxanes directed by the amide hydrogen bonding using the threading-followed -by- stoppering ... 5.1 Synthesis of [4]MN from the quantitative self-assembly of nine species Scheme 5.2 Synthesis of [5]MN by the 2+2 approach through incorporation of Cu2+ ions Scheme 5.3 120 120 Synthesis of...
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Báo cáo hóa học: "The Influences of H2 Plasma Pretreatment on the Growth of Vertically Aligned Carbon Nanotubes by Microwave Plasma Chemical Vapor Deposition" pptx
... decomposition of hydrocarbon gas at the surface of the catalyst nanoparticles; (2) diffusion of resultant carbon atom in the nanoparticles to form the nucleation seed; and (3) precipitation of carbon atoms ... flow rate of H2 during plasma pretreatment This leads Ni particles to become smaller at the support of H2 from the same temperature Herein, it appears that a higher flow rate of H2 plasma pretreatment ... of MWCNTs was synthesized at the flow rate of 300 sccm We confirmed that the Ni layer not 123 232 Fig SEM images of Ni catalyst nanoparticles at various H2 flow rate during plasma pretreatment of...
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Báo cáo hóa học: " Excellent Field Emission Properties of Short Conical Carbon Nanotubes Prepared by Microwave Plasma Enhanced CVD Process" doc
... hence slow rate of carbon supply to the catalyst particles is expected The substrate temperature is also low since it is plasma dependent in the present geometry and hence slow growth rate Consequently, ... in NH3 plasma followed by (ii) introduction of C2H2 for carbon film deposition The pretreatment of Fe films had three main objectives: (i) heating the substrate to the desired growth temperature, ... and low density CNTs are observed at low input microwave power With increase in microwave power both plasma density and substrate temperature increase, resulting more number of CNTs nucleation...
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Báo cáo hóa học: " Excellent Field Emission Properties of Short Conical Carbon Nanotubes Prepared by Microwave Plasma Enhanced CVD Process" pot
... hence slow rate of carbon supply to the catalyst particles is expected The substrate temperature is also low since it is plasma dependent in the present geometry and hence slow growth rate Consequently, ... in NH3 plasma followed by (ii) introduction of C2H2 for carbon film deposition The pretreatment of Fe films had three main objectives: (i) heating the substrate to the desired growth temperature, ... and low density CNTs are observed at low input microwave power With increase in microwave power both plasma density and substrate temperature increase, resulting more number of CNTs nucleation...
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Báo cáo khoa học: The histidine-phosphocarrier protein of Streptomyces coelicolor folds by a partially folded species at low pH ppt
... of denaturation, and [D]50% is the denaturant concentration at the midpoint of the transition The chemical- denaturation-binding model [25,26] was also used for the fitting of the chemical denaturation ... follows a two-state mechanism Fig Thermal denaturation profiles of HPr followed by FTIR (A) Thermal denaturation profiles of HPr at pH 2.5 (filled squares) and pH 7.5 (filled circles) The lines at ... the chemical denaturation curves of HPr at pH 7.5, 10 mM phosphate, followed by fluorescence, far-UV and gel filtration chromatography at 25 °C The agreement between the three probes suggests that...
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effects of growth temperature on carbon nanotube array thermal interfaces
... Synthesis of Carbon Nanofibers at Room Temperature, ” Nat Mater., 1, pp 165–168 Hofmann, S., Ducati, C., Robertson, J., and Kleinsorge, B., 2003, “LowTemperature Growth of Carbon Nanotubes by Plasma- Enhanced ... because of a lower reaction energy that impedes the CNT growth process At low growth temperatures, there is a decrease in surface diffusion of the catalyst nanoparticles, carbon solubility in the catalyst ... CNT array thermal interface resistances ͓1–6͔ Moreover, it has been demonstrated that CNT arrays that provide good thermal interface conductance can be grown at reduced temperatures that allow...
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Báo cáo hóa học: " Combination of Polymer Technology and Carbon Nanotube Array for the Development of an Effective Drug Delivery System at Cellular Leve" pptx
... whereby they acquire most of the characteristic properties of sympathetic neurons Other salient responses to NGF include cessation of proliferation, generation of long neurites, acquisition of ... Just 2% of fetal bovine serum was used for the differentiation experiments Cells were maintained at 37 °C in a saturated humidity atmosphere of 95% air/5% CO2 Alginate film coated on the CNT array ... and by fitting the experimental data with the mathematical model of Eq 1, the h value resulted 10-9 m/s, in agreement with data given in the literature for alginate microsphere [20] Induction of...
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Báo cáo hóa học: " Fabrication of Carbon Nanotube/SiO2 and Carbon Nanotube/ SiO2/Ag Nanoparticles Hybrids by Using Plasma Treatment" pptx
... Fabrication of SWCNT@SiO2 Therby The side walls of SWCNTs can be modified with hydroxyl groups by means of plasma treatment The presence of hydroxyl groups bearing on the surface of resulting plasmatreated ... repeated times to introduce hydroxyl groups homogeneously on the side walls of SWCNTs Preparation of SWCNT@SiO2 Composite Scheme Schematic illustration of fabrication of SiO2-coated single wall carbon ... In a typical reaction, 0.4 mL of ammonia water (28 wt %), lL of MPTO, and 0.1 mL of TEOS were orderly added to the reactor containing 10 mL of absolute ethanol and mg of plasma- treated SWCNTs...
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Tài liệu Báo cáo Y học: Dinucleoside polyphosphates stimulate the primer independent synthesis of poly(A) catalyzed by yeast poly(A) polymerase ppt
... that Gp2G, Gp3G, and Gp4G stimulated that synthesis Stimulation of poly(A) synthesis as a function of diguanosine diphosphate (Gp2G) concentration The concentration of dinucleoside polyphosphate ... incubation (a time at which the velocity of the reactions were linear, as tested in previous assays) spotted on TLC plates and the rate of synthesis of poly(A) as a function of ATP concentration ... particularly at low ATP concentrations; for instance at 0.02 mM ATP, concentrations as low as lM of some dinucleotides may increase poly(A) synthesis more than sixfold.; the influence that this activation...
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Báo cáo khoa học: Template-independent ligation of single-stranded DNA by T4 DNA ligase doc
... targetdependent or template- dependent ligation followed by an amplification method, so that the accuracy of the results, especially at low concentration of template, may be severely compromised A number of such ... efficiency of nontemplated DNA ligation on the strandedness of the DNA substrate at the ligation point, we determined A B Fig Determination of ligation yields by qcPCR (A) Co-amplification of fmol ... denaturation step at 94 °C for 60 s, followed by 37 cycles of denaturation at 94 °C for 30 s, primer annealing at 60 °C for 30 s, and extension at 72 °C for 30 s The last cycle was followed by...
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carbon nanotube array thermal interfaces for high temperature silicon carbide devices
... per minute at STP) of H2 Carbon nanotube growth conditions were established by igniting a 200-W plasma and introducing 10 SCCM of CH4 into the chamber for a duration of 10 HIGH -TEMPERATURE SILICON ... uncertainty is dominated by the measurement of the phase shift signal, which exhibited higher noise levels at elevated temperatures as indicated by the larger error bars for higher temperatures in the ... [23–25], and the resistance of the MWCNT array was lumped into interface resistance when data fitting at elevated temperatures (the required data collection time at each temperature is significantly...
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palladium thiolate bonding of carbon nanotube thermal interfaces
... different array locations at a moderate magnification in the FESEM The average CNT diameter for each array was approximately 30 nm while the array heights were approximately, 15–25 lm R Preparation of ... CNT array and at higher magnification, and Fig 7(b) reveals sites in which CNTs were once attached to the growth substrate Examination of Figs 7(c) and 7(d) indicate the clumps of CNTs are also attached ... characterization of the CNT TIMs will elucidate the results of this study Lastly, additional optimization related to coating and thermolysis of the Pd hexadecanethiolate solution on the CNT arrays...
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palladium thiolate bonding of carbon nanotube thermal interfaces
... different array locations at a moderate magnification in the FESEM The average CNT diameter for each array was approximately 30 nm while the array heights were approximately, 15–25 lm R Preparation of ... CNT array and at higher magnification, and Fig 7(b) reveals sites in which CNTs were once attached to the growth substrate Examination of Figs 7(c) and 7(d) indicate the clumps of CNTs are also attached ... characterization of the CNT TIMs will elucidate the results of this study Lastly, additional optimization related to coating and thermolysis of the Pd hexadecanethiolate solution on the CNT arrays...
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the physics of carbon nanotube devices, 2009, p.310
... structures that carbon The Physics of Carbon Nanotube Devices Figure 1.3 Forms of nanotubes: (a) scanning tunneling microscope image of a single wall carbon nanotube (b) A bundle of single wall nanotubes ... and kB T is in eV At room temperature a good rule of thumb is f 103 /R3/2 1.2.5 Temperature Dependence of Bandgap The derivation of the electronic band structure of carbon nanotubes in the ... single carbon nanotube as a function of temperature The blueshift is clearly visible in the data, and at room temperature the bandgap is reduced by less than meV from the small temperature limit...
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Báo cáo hóa học: " Facile template-free synthesis of pine needle-like Pd micro/nano-leaves and their associated electro-catalytic activities toward oxidation of formic acid" pot
... the electrocatalytic activity of the catalysts and the anodic scan allows the formation and builds up of the poisonous intermediate, we thereby focus our observations on the evolution of the anodic ... observed It is proposed that the formation of Pd micro/nano-leaves is related to the effect driven by phosphate anions Secondly, using a potentiostatic method instead of the cyclic voltammetry ... critical to the formation of Pd nanoleaf structure At the same time, varying the experimental conditions, such as the concentration, pH of the initial solution, reaction temperature, and time, may...
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Báo cáo hóa học: "Effect of the carbon nanotube surface characteristics on the conductivity and dielectric constant of carbon nanotube/poly(vinylidene fluoride) composites" doc
... occurs at specific temperatures, identification of the surface groups is possible [10,13,14] It is well known that CO2 formation results from the decomposition of carboxylic acids at low temperature, ... concentration and shifts the percolation threshold to higher concentrations Table BET surface areas obtained by adsorption of N2 at -196°C and amounts of CO2 and CO obtained by integration of areas ... which matches well with the pHPZC results (Table 1) The acidic character of the samples decreases by increasing the thermal treatment temperature, since the acidic groups are removed at lower temperatures...
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Báo cáo hóa học: "Synthesis of carbon nanotubes with and without catalyst particles" doc
... precipitation rate To grow carbon nanotubes, Lu and Liu [17] argue one needs to match the carbon supply rate to the tube formation rate Figure Schematic showing base growth and tip growth of carbon ... small (
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