young s modulus of electrospun tio2 carbon nanotube composit
Báo cáo hóa học: " In situ Polymerization of Multi-Walled Carbon Nanotube/Nylon-6 Nanocomposites and Their Electrospun Nanofibers" pot
... specific strength and modulus of nanocomposite nanofibers increased as compared to those of neat nylon-6 nanofibers Nanocomposite nanofibers contained mostly c-phase of nylon-6 while the nanocomposite ... tensile strength and modulus were calculated because the pores in the cross section of the nanofiber mat not give the true stress if the cross-sectional area is used for calculating the nominal stress ... the small size of the crystal [48] Conclusions We prepared two kinds of the nanocomposites by using an in situ polymerization method in the presence of the F-MWNTs and the P-MWNTs The F-MWNTs were...
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Báo cáo hóa học: " A Facile Synthesis of Polypyrrole/Carbon Nanotube Composites with Ultrathin, Uniform and Thickness-Tunable Polypyrrole Shells" ppt
... represents the diffusion-limited electron-transfer process [46,47] It can show all of resistances of supercapacitors, which are the electrolyte resistance (Rs) and the sum of the electrode itself ... provide the basis for tuning the polymer thickness to improve the properties of carbon- based device Results and Discussion The preparation of the PPy/MWCNT composites based on a improved in situ chemical ... ratio of ethanol and acid solution as the reaction solution significantly influence the morphology of the PPy/ MWCNT composites The detail of synthesis process is described in ESM The PPy films coating...
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Báo cáo hóa học: " Synthesis of multi-walled carbon nanotube/ polyhedral oligomeric silsesquioxane nanohybrid by utilizing click chemistry" pptx
... of POSS molecules on the surface of the MWNTs [24,25] TGA data of POSS show almost complete mass loss at temperatures over 450°C due to its sublimation [10] Conclusion In summary, the synthesis ... analysis of pristine MWNTs (a), MWNT-POSS nanohybrid (b), pure POSS (c), solubility test results (inset) of pristine MWNTs (P), and MWNT-POSS nanohybrid (F) Yadav et al Nanoscale Research Letters ... (Figure 4a) show that MWNTs are grafted by the POSS molecules This shows strong evidence that the POSS molecules are well coated on the surface of the MWNTs These results are also strongly supported...
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Báo cáo hóa học: " Electrical behavior of multi-walled carbon nanotube network embedded in amorphous silicon nitride" potx
... Abbreviations CNTs: carbon nanotubes; MWCNTs: multi-walled carbon nanotubes; PMMA: poly(methyl methacrylate); SWCNTs: single-walled carbon nanotubes; THF: tetrahydrofuran; XTEM: cross-sectional transmission ... electrometer Results and discussions A low magnification image of the cross-section specimen of the Cr/Al/MWCNT-SiN/Cr/Al sandwich sample is presented in Figure It confirms the structure expected ... protruding ends of the nanotubes from the etched silicon nitride Cross-sectional transmission electron microscopy (XTEM) investigations were made on a Jeol TEM 200CX instrument The XTEM specimen was prepared...
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Báo cáo hóa học: "Electrochemical properties of double wall carbon nanotube electrodes" pptx
... also that DWNTas and DWNTox provide fast electron transfer However, in case of SWNT the results suggest that there is significant difference between resistivity of SWNTas and SWNTox films DEp of ... nanotubes as DWNTas and SWNTas For SEM measurements, the carbon nanotube films were adhered on conducting tape For the electrochemistry measurements, the carbon nanotubes were cast onto the glassy carbon ... microscopy was used to study the morphology of as received DW and SW nanotube films (see Fig S1 , in Electronic Supplementary Material (ESM)) It is clear from these figures that the DWNTas and SWNTas...
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báo cáo khoa học: " Comparison of Radioimmuno and Carbon Nanotube Field-Effect Transistor Assays for Measuring Insulin-Like Growth Factor-1 in a Preclinical Model of Human Breast Cancer" doc
... presented as means ± S. E.M Significance was assigned at P ≤ 0.05 IGF-1 CNT-FET Assay Single-walled carbon nanotubes (SWNTs) were purchased from Carbon Nanotechnologies Inc The SWNTs mixture used ... BRCA1-associated breast cancer, increased expression of several components of the IGF axis is seen in liver, normal mammary tissue and mammary tumors of these mice along with increased levels of ... required at least 50-100 μl of undiluted mouse serum Both the RIA and CNT-FET assay gave comparable results using the same mouse plasma samples, namely a statistically significant increase in serum IGF-1...
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Báo cáo toán học: " Structure and electrical properties of sputtered TiO2/ZrO2 bilayer composite dielectrics upon annealing in nitrogen" pdf
... Technologies Inc., Santa Clara, CA, USA) Results and discussion The chemical composition of the TiO2/ ZrO2/Si film can be measured by XRF, and all samples have nearly the same atomic Ti content of 21%, ... 2/ZrO2/Si film was studied by TEM We take the as-deposited and 773 K annealed samples representatively for analysis Figure 1a presents the micrograph of the as-deposited sample It can be clearly seen ... the structure includes the two layer stacks of TiO2 and ZrO2 films and that the interface layer is observed between the ZrO2 film and the Si substrate The physical thickness of ZrO2 and TiO2...
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Tài liệu Commodore Barney''''s Young Spies A Boy''''s Story of the Burning of the City of Washington docx
... Barney 's Young Spies, by James Otis Language: English Character set encoding: ISO-8859-1 *** START OF THIS PROJECT GUTENBERG EBOOK COMMODORE BARNEY 'S YOUNG SPIES *** Produced by David Edwards, Odessa ... was at war with England, and it stands to reason that we lads were eager to know all that was possible concerning this officer, who had been the most successful of the privateers sailing out of ... "He 's of much the same kidney as Elias Macomber, except that he was born in this country A mean native of North Carolina, who starves his slaves, and makes them work twice as many hours as they should...
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effects of growth temperature on carbon nanotube array thermal interfaces
... ͑average peak-tovalley surface height of 0.4 m͒ was used as the top interface substrate to enable precise PA measurements ͓4͔ Results and Discussion Fig SEM images of CNT arrays grown from 806° C ... temperatures, there is a decrease in surface diffusion of the catalyst nanoparticles, carbon solubility in the catalyst nanoparticles, and the diffusion of the carbon feedstock All these factors play ... “Parametric Study of Synthesis Conditions in Plasma-Enhanced CVD of High-Quality Single-Walled Carbon Nanotubes,” Carbon, 44, pp 10–18 Amama, P B., Maschmann, M R., Fisher, T S. , and Sands, T D.,...
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palladium thiolate bonding of carbon nanotube thermal interfaces
... regression analysis Thermal testing was proceeded by assessment of the Pd enhanced bond by FESEM Figures and contain images of the structures after the bond was broken and the substrates were separated ... is based on a set of one-dimensional heat conduction equations, thermal interface resistances are determined using a least-squares fitting method Results and Discussion The PA technique was used ... 128.211.161.17 Redistribution subject to ASME license or copyright; see http://www.asme.org/terms/Terms_Use.cfm Fig Cross-sections of various TIM structures tested (a) Si/ CNT/Ag and (b) Si/CNT/CNT/Cu...
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photoacoustic characterization of carbon nanotube array thermal interface material
... atmospheric pressure͒, is much less than the PA cell radius ͑4 mm͒ which supports the assumptions of the PA model.36 The phase-shift signal is used in this work instead of the amplitude because ... component resistance measurements in this study produced the largest error in terms of percentage Resolving these resistances with even greater precision is an issue that necessitates further study ... been used to measure the resistance of atomically bonded interfaces,23,28,29 for which resistances were orders of magnitude less than the resistances measured in this study The use of the PA technique...
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palladium thiolate bonding of carbon nanotube thermal interfaces
... regression analysis Thermal testing was proceeded by assessment of the Pd enhanced bond by FESEM Figures and contain images of the structures after the bond was broken and the substrates were separated ... is based on a set of one-dimensional heat conduction equations, thermal interface resistances are determined using a least-squares fitting method Results and Discussion The PA technique was used ... 128.211.161.17 Redistribution subject to ASME license or copyright; see http://www.asme.org/terms/Terms_Use.cfm Fig Cross-sections of various TIM structures tested (a) Si/ CNT/Ag and (b) Si/CNT/CNT/Cu...
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photoacoustic characterization of carbon nanotube array thermal interface material
... atmospheric pressure͒, is much less than the PA cell radius ͑4 mm͒ which supports the assumptions of the PA model.36 The phase-shift signal is used in this work instead of the amplitude because ... component resistance measurements in this study produced the largest error in terms of percentage Resolving these resistances with even greater precision is an issue that necessitates further study ... been used to measure the resistance of atomically bonded interfaces,23,28,29 for which resistances were orders of magnitude less than the resistances measured in this study The use of the PA technique...
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thermomechanical and thermal contact characteristics of bismuth telluride films electrodeposited on carbon nanotube arrays
... less than 10% of the TE leg resistance For Bi2Te3 films of 100 mm thickness, the measured thermal interface resistances of CNT-TE samples is $55% of the intrinsic resistance of the TE film itself ... technique, a sinusoidally modulated fiber laser is used to periodically heat the surface of the samples The heated area of the sample s surface is surrounded by a sealed acoustic chamber; thus, a periodic ... alloy TE leg of 300 mm thickness Finally, a process flow was developed for patterned synthesis of TE films on CNT array coated surfaces Acknowledgements One of the authors (H M.) thanks Ms Patricia...
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the physics of carbon nanotube devices, 2009, p.310
... transmission shows steps when a subband opens or closes The magnitude of the change in transmission at these steps corresponds to the subband degeneracy For example, the subbands shown by the dashed ... armchair nanotubes have the same number of atoms per unit cell arises because the structure of both of these nanotubes consists of parallel rings of atomszigzag nanotubes have n atoms per ring ... ) H r d3 r sk H s k = rs rs eikãrs = rs eikãrs rs (r ) eikãrs rs d3 rs (r ) Hrs (r ) r (1.5) The Physics of Carbon Nanotube Devices From Eq (1.2) we have d3 rs (r ) Hrs (r ) = rs rs =ri r (1.6)...
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Báo cáo hóa học: " Enhancements of thermal conductivities with Cu, CuO, and carbon nanotube nanofluids and application of MWNT/water nanofluid on a water chiller syste" docx
... results and theoretical study on nanofluids [5] Many studies on the thermal conductivities of nanofluids had focused on the nanofluids synthesized methods such as physical mixing In previous study, ... total surface areas of nanoparticles The viscosity is measured with portable viscosimeter The viscosity of CuO nanofluids is also found to increase with the volume ratio It is seen that the viscosity ... there is no surfactant or dispersant used for the nanofluids It is thus expected that the associated increase in pumping power is small and this increases the potential usage of MWNT nanofluids in...
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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
... This sample also presents the lowest ratio CO/CO2 and the lowest value of pHPZC, indicating that this is the most acidic sample CNTox900 presents the highest CO/CO2 ratio, suggesting the less-acidic ... be observed that the oxidation treatments lead to an increase of the specific surface area This occurs because the process opens the endcaps of CNTs and creates sidewall openings [17] The specific ... conductivity of carbon nanofiber-epoxy composites’ Phys Status Solidi A Appl Mater Sci 2010, 207:407 Costa P, Silva J, Sencadas V, Costa CM, Van Hattum FWJ, Rocha JG, Lanceros-Mendez S: ’The effect of...
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Báo cáo hóa học: " Fabrication of functional micro- and nanoneedle electrodes using a carbon nanotube template and electrodeposition" ppt
... electrodes with desired properties Abbreviations AFM: atomic force microscope; CNT: carbon nanotube; DEP: dielectrophoresis; EDS: energy dispersive spectroscopy; PPy: polypyrrole; SDS: sodium dodecylsulfate; ... acids and weak bases and thus potentially affect a wide array of biological processes [29] The nanoneedle pH sensor enables measurement of intracellular pH [11] The potentiometric response of ... deposition time A scanning electron microscope (SEM) image of a CNT nanoneedle before and after Au coating is presented in Figure Energy dispersive spectroscopy (EDS) spectrum showed that carbon...
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Báo cáo hóa học: " Evaluation of the nanotube intrinsic resistance across the tip-carbon nanotube-metal substrate junction by Atomic Force Microscopy" pptx
... way with series-parallel resistances (Figure 3b), which is consistent with the previously published results [19,29] The global resistance measured can thus be considered as the sum of several ... is lower than RPt/Ir-CNT Besides these measurements on ‘raw’ CNTs, a series of tests on CNTs functionalized with AuNPs was also carried out in order to see if electrical properties of the CNTs ... zone, successive scans at different bias voltages were performed in order to determine the sensitivity to this parameter Results and discussion Contact resistance measurement methods Comparison...
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Báo cáo hóa học: " Frequency Shift of Carbon-Nanotube-Based Mass Sensor Using Nonlocal Elasticity Theory" ppt
... the dimensionless mass and position of the attached mass, respectively; w1 and w2 are the dimensionless transverse displacements on the left and right sides of the attached mass, respectively ... effect of the location of attached mass on the frequency shift of the mass sensor is significant Increasing the value of c/L increases the frequency shift This is because the frequency of the sensor ... mass decreases with increasing the particle mass Increasing the value of c/L is equivalent to an increase of the particle mass at the same location 10 Dimensionless sensitivity (σ m ) Dimensionless...
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