mechanical electrical and thermal properties of polyimide nanocomposites

... case of former and with wt% in case of the latter Electrical Properties Fig SEM images of a raw, b acid modified-MWCNTs and c amide-MWCNTs As in the case of TS, the YM of the amide-MWCNTs/ polyimide ... acid-MWCNTs/ polyimide nanocomposites and c amide-MWCNTs /polyimide nanocomposites 123 452 Nanoscale Res Lett (2008) 3:444–453 Table Thermal degradation temperature (Td) and T5 of MWCNTs /polyimide nanocomposites ... the field of preparation and study of CNTs /polyimide nanocomposites from various angles ranging from highly conductive to super strong CNTs /polyimide nanocomposites Addressing the problem of poor...

Ngày tải lên: 22/06/2014, 01:20

... matrix and SBS gels were mixed with NR at a given concentration, to investigate their effect on the morphology, mechanical, dynamic mechanical and thermal properties of raw SBR and NR Morphology of ... (2009) 4:420–430 and ‘c’ is the amount (phr) of prevulcanized SBR gel added into the NR latex Characterization of Gelled Latex Samples and Measurements of Various Properties of Gel Filled Rubbers ... accelerating voltage of 200 kV For the measurement of mechanical properties of the neat matrix, individual gels and gel filled matrices, tensile specimens were punched out from the cast sheets of mm thickness,...

Ngày tải lên: 22/06/2014, 01:20

... Magnetocaloric effect and magnetothermopower in xLaxSr0.3MnO3 Sm0.7- 196 6.1.2 Electrical, magnetic and magnetothermal properties of La0.7-xPrxCa0.3MnO3 198 6.1.3 Electrical and thermal transport ... (b)] and x= 0.5 [(c) and (d)] and x= 0.6 [(e) and (f)] compounds 106 Figure 3.23: Temperature dependence of ′ and ′′ at f = 100 kHz [(a) and (b)] and f = MHz [(c) and (d)] under 0H ... [(a) and (b)] and x= 0.2 [(c) and (d)] compounds 105 Figure 3.22: Temperature dependence of  and ’’ under zero field for selected frequencies (f = 0.1-5 MHz) for x= 0.4 [(a) and (b)] and x=...

Ngày tải lên: 10/09/2015, 09:11

... structure because of both low Ea and optimized quantity of substitution function of Ag+ [19] However, stress of lattices structure on both 3SZO and 5SZO NWs is very impressive because a lot of Ag interstitials ... Programs” of the Ministry of Education, Science and Technology, Korea Author details Electronic Materials Center, Korea Institute of Science and Technology, Seoul 136-791, Korea 2Department of Electrical ... images of various SZO NWs grown using 1, 3, and wt.% Ag-doped ZnO ceramic targets As shown in Figure 1a, b, the distribution of the SZO NWs is random, with the average diameter of about 60 nm and...

Ngày tải lên: 20/06/2014, 22:20

... magnetized curve of the Fe O nanofluid measured by a VSM Results and discussion Different magnetic cores, air, and Fe3O4 nanofluids of 0.25, 0.5, 0.75, and M were applied as the magnetic core of transformers ... with the increase of Fe3O concentration, and it increases as a function of frequency At 100 MHz, the resistances with the magnetic core of 0.25 and M Fe O nanofluids were two and five times the ... area of solenoid, and l is the length of solenoid, μ” is the real part of complex permeability, and μ” is the imaginary part of complex permeability It can be observed that the imaginary part of...

Ngày tải lên: 21/06/2014, 04:20

... small as Rsh of the cell is in the order of MX.cm2 The short circuit current increases by a factor of three due to the decrease of Rs Contact and Sheet Resistances To identify the origin of the large ... Other possible solutions include reduction of the barrier height and thickness of the quantum mechanical tunnelling barrier, modification of the composition of the cell’s absorber material, improved ... material and measurements were carried out before and after each annealing step The measurement is able to extract contact (Rc) resistance of the bottom electrode and sheet (Rsheet) resistance of the...

Ngày tải lên: 21/06/2014, 07:20

... well-established knowledge of the electrical and optical properties of GaSe thin films, in this paper, we report the results on electrical and optical measurements of amorphous thin films of GaSe nanorods ... field of micro/optoelectronics Significant research efforts have been focused to the study of the electrical and optical properties of this compound in thin film formation Since the optimization of ... frequency doubling and fast optical gating [11] and behaves as an X-ray detector [12] Electronic and optoelectronic properties of GaSe, GaS, and InSe materials indicate the possibilities of realizing...

Ngày tải lên: 21/06/2014, 17:20

... (a) Volume fraction of polymer (Φ) as a function of no showing fraction of chains in the random conformation(ξ) of 0.5, 0.7 and 0.9 ξ is obtained from quantitative modeling of each UV-vis solution-state ... production of poly(3-akylthiophene) nanofibers by means of whisker method using anisole solvent: structural, optical, and electrical properties Macromolecules 41, 8000-8010 (2008) 40 Malik, S & Nandi, ... concentration of 10−20 mg/mL, nearly half of the chains exist in π-stack clusters (b) Dependence of ξ on volume fraction of polymer Φ Solid triangle (▲) and square (■) are experiment data and solid...

Ngày tải lên: 11/09/2015, 09:57

... CTBN and the EP, and to investigate the thermal, mechanical, and morphological properties of the modified EP EXPERIMENTAL 2.1 Materials The clear epoxy 331, with an epoxide equivalent weight of ... effect of CTBN content on the glass transition temperatures (Tg) of the EP Properties of Modified Epoxy Resin 3.3 Tensile Properties Table shows the effect of CTBN content on the tensile properties ... flexural strength and modulus of modified EPs A similar trend was found in the case of the tensile properties; the flexural strength and modulus of modified EPs are lower than those of the unmodified...

Ngày tải lên: 07/08/2014, 14:20

... characteristics of the "Sassi of Matera" and "Trulli of Alberobello" In the South of Italy, the sites of the "Sassi of Matera" (Figure 1a) (classified as humanity world heritage in 1993) and "Trulli of Alberobello" ... consisted of the measurement of thermal conductance of two different typologies of building wall: a wall in blocks of calcarenite sandstone assembled with mortar, typical of the constructions of "Sassi ... Polytechnic of Bari, were performed on some samples of calcarenite sandstone and calcareous stone of Fasano The goal of the laboratory tests was to experimentally find the thermophysical properties of...

Ngày tải lên: 05/09/2013, 14:58

... the metal particles, (ii) formation of liquid droplet of metal and Si/SiOx and (iii) the precipitation in the form of solid nanowires after super-saturation of liquid metal–Si/SiOx droplet at ... of crystalline Si core and amorphous SiO2 outer shell structure as confirmed by HRTEM image and SAED pattern On the other hand, the formation of crystalline Si–SiO2 core-shell nanowires first and ... agglomerated clusters consisting of high density of nanowires The magnified view of a single cluster is depicted in the inset of Fig 2(d) These observations suggest that growth of nanowires in the present...

Ngày tải lên: 16/03/2014, 15:18

... existence of multiple G peaks The quality of the fit in the low-energy and high-energy tails of the D- and G-bands, respectively, is good The assignment of the peak components of the D- and G-bands ... spectra of CNTs grown under negative and zero dc bias voltage represent sp3 rich phases of CNTs and suggest the existence of amorphous carbon or defects on the walls of CNTs.31 The absence of a ... quality of the CNTs Yoshida et al.32 have shown that the FWHM intensity of the G-band reflects the degree of graphitization of carbon materials The effect of dc bias voltage on the IG/ID ratio and...

Ngày tải lên: 06/05/2014, 08:53

... the design of the study and performed the electrical studies SK and MA carried out the structural studies SAA and MSA performed the thermal studies MAMK and MA also involved in writing of the manuscript ... 200°C and 300°C which mainly attributed to crystallization of silver nanoparticles DTA profiles show that complete thermal decomposition and crystallization of the sample occur simultaneously Electrical ... occurs between 200°C and 300°C; and the reaction is of exothermic type The temperature dependence of resistivity of silver film exhibits semiconducting behavior of the sample The electrical conduction...

Ngày tải lên: 21/06/2014, 02:20

... Ultrasonication effects on thermal and rheological properties of carbon nanotube suspensions Binglu Ruan*1,2 and Anthony M Jacobi1 Mechanical Science and Engineering, University of Illinois, Urbana, ... ultrasonication time effects on sediment and the thermal conductivity of the carbon nanotubeethylene glycol nanofluids and found that thermal conductivity of the nanofluids increased with sonication ... B and n are constants, and t is the sonication time The data in Figures 13 and 14 were fit to curves of the forms given by (Equations and 2) The values of the constants and the coefficients of...

Ngày tải lên: 21/06/2014, 17:20

... to study the effect of uniaxial tensile stress along the c axis on the mechanical and piezoelectric properties of short-period BTO/PTO superlattice We show the mechanical properties by calculating ... lattice constants of the unstrained superlattice structure We have examined the accuracy of our calculations by studying the influence of different strains on the properties of BTO and PTO, respectively ... coefficient d33 of ground state superlattice is 86.36 pC/N, which is slightly less than the value of 103.18 pC/N of PTO, but much larger than the value of 36.43 pC/N of BTO Under the loading of uniaxial...

Ngày tải lên: 22/06/2014, 00:20

... Hot Topics in Thermal Analysis and Calorimetry Volume Series Editor: Judit Simon, Budapest University of Technology and Economics, Hungary Thermal Properties of Green Polymers and Biocomposites ... CHARACTERIZATION OF GREEN POLYMERS Thermal Analysis 13 Other Characterization Methods 25 Chapter THERMAL PROPERTIES OF CELLULOSE AND ITS DERIVATIVES Introduction 39 Thermal Properties ... lignin and green polymers by thermal and mechanical analyses, spectroscopy, and x-ray diffractometry Synthesis of green polymers derived from saccharides and lignins, such as polyurethane and polycaprolactone...

Ngày tải lên: 27/06/2014, 15:20

... Hot Topics in Thermal Analysis and Calorimetry Volume Series Editor: Judit Simon, Budapest University of Technology and Economics, Hungary Thermal Properties of Green Polymers and Biocomposites ... CHARACTERIZATION OF GREEN POLYMERS Thermal Analysis 13 Other Characterization Methods 25 Chapter THERMAL PROPERTIES OF CELLULOSE AND ITS DERIVATIVES Introduction 39 Thermal Properties ... high profile research subjects in academic and industrial fields The authors of this book have continuously made efforts to investigate the properties, especially thermal properties, of green...

Ngày tải lên: 11/08/2014, 06:20

... the number of the specimens should be more than three and significant figures of size and those of mass should be coordinated Density Characterization of Green Polymers 27 Density of the sample ... (Japanese) Liu, Z and Hatakeyama, T eds 1994, Handbook of Thermal Analysis, Beijing, Chemical Industry Press (Chinese) Hatakeyama, T and Quinn, F X., 1994, Thermal Analysis Fundamentals and Applications ... 33 Hatakeyama, T and Liu, Z., 1998, Handbook of Thermal Analysis John Weily, Chichester 34 Liu, Z and Hatakeyama, T and Zhang, X., 2001, Thermal Measurements of Polymeric Materials Industrial Chemistry...

Ngày tải lên: 11/08/2014, 06:20

... structure of natural cellulose and the structure of water vary as a Thermal Properties of Cellulose and Its Derivatives 65 function of Wc, Cp water and Cp cellulose changes as a function of Wc Accordingly, ... Figure 2-20) of the OH band at 3360 cm-1 and OD band at 2530 cm-1 were calculated using the band of 2900 cm-1 (CH and CH2 stretching) as an internal standard Using an internal standard, differences ... Tg (∆Cp) and molecular mass of NaCMC (DS = 1.4) [24] Definition of ∆Cp (see Figure 2.10) Thermal Properties of Cellulose and Its Derivatives 49 Figure 3-14 shows heat capacity curves of sodium...

Ngày tải lên: 11/08/2014, 06:20

... representative curves of relative baseline optical density of OH stretching band of various types of lignin as a function of temperature The relative optical density of OH stretching band starts to decrease ... Kinetics of thermal decomposition of lignin TG has extensively been used to analyze kinetic parameters of thermal decomposition of polymeric materials In order to obtain activation energy, and reaction ... structures of lignin p-hydroxyphenyl (I), guaiacyl (II), and syringyl (III) structures Lignin is a major component of plants Scanning electron and ultraviolet micrographs of the cross section of cedar...

Ngày tải lên: 11/08/2014, 06:20