High-thermal-conductivity, mesophase-pitch-derived carbon foams: effect of precursor on structure and properties

Klett, James W.; Hardy, R. W.; Romine, Ernie; Walls, Claudia; Burchell, Timothy D

doi:10.1016/s0008-6223(99)00190-6

Cited by 420 publications

(182 citation statements)

References 19 publications

Supporting

Mentioning

173

Contrasting

Unclassified

Order By: Relevance

“…Carbon foam (CF) is a sponge-like rigid high-performance engineering materials in which carbon ligaments are interconnected to each other (Klett et al 2000(Klett et al , 2004. Recently, it has attracted lot of attention owing to outstanding properties such as low density, large surface area with open cell wall structure, good thermal and mechanical stability (Gallego and Klett 2003;Inagaki et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Nickel nanoparticles embedded in carbon foam for improving electromagnetic shielding effectiveness

2014

View full text Add to dashboard Cite

To improve electromagnetic shielding effectiveness of light weight carbon foam (CF), magnetic nanoparticles were embedded in it during processing. The CF was developed from the coal tar pitch and mixture of coal tar pitch-Nickel (Ni) nanoparticles by sacrificial template technique and heat treated to up 1,000°C. To ascertain the effect of Ni nanoparticles embedded in CF, it was characterized by scanning electron microscopy, X-ray diffraction, Raman spectroscopy, vector network analyzer and vibration sample magnetometer. It is observed that Ni nanoparticles embedded in the carbon material play an important role for improving the structure and electrical conductivity of CF-Ni by catalytic carbonization. The structural investigation suggests that the Ni nanoparticles embedded in the carbon material in bulk as well on the surface of CF. The CF demonstrates excellent shielding response in the frequency range 8.2-12.4 GHz in which total shielding effectiveness (SE) dominated by absorption losses. The total SE is -25 and -61 dB of CF and CF-Ni, it is governed by absorption losses -48.5 dB in CF-Ni. This increase is due to the increase in dielectric and magnetic losses of ferromagnetic Ni nanoparticles with high surface area. Thus, light weight CF embedded with small amount of magnetic nanoparticles can be useful material for stealth technology.

show abstract

Section: Introductionmentioning

confidence: 99%

Nickel nanoparticles embedded in carbon foam for improving electromagnetic shielding effectiveness

2014

View full text Add to dashboard Cite

show abstract

“…The recent development of graphitic foams 6 characterized by highly aligned graphitic structures has attracted attention for thermal management devices 7 , and with unusually high thermal conductivity-to-weight ratios such graphitic carbons are promising aeronautical and aerospace industrial materials. Among the many methods for carbon nanostructure growth [8][9][10] , the organometallic approach [11][12][13] has been widely used and is one of the principal synthetic methods.…”

Section: Introductionmentioning

confidence: 99%

Layered Graphitic Carbon Host Formation during Liquid-free Solid State Growth of Metal Pyrophosphates

et al. 2012

View full text Add to dashboard Cite

Original citationDiaz, C., Valenzuela, M. L., Lavayen, V. and O'Dwyer, C. (2012) 'Layered graphitic carbon host formation during liquid-free solid state growth of metal pyrophosphates', Inorganic Chemistry, 51 (11) AbstractWe report a successful ligand-and liquid-free solid state route to form metal pyrophosphates within a graphitic carbon matrix through a single step approach involving pyrolysis of previously synthesized organometallic derivatives of a cyclotriphosphazene. In this case, we show how single crystal Mn 2 P 2 O 7 can be formed either on the micro-or nanoscale in the complete absence of solvents or solutions by an efficient combustion process using rationally designed macromolecular trimer precursors, and present evidence and a mechanism for layered graphite host formation.Using in situ Raman spectroscopy, infrared spectroscopy, X-ray diffraction, high resolution electron microscopy, thermogravimetric and differential scanning calorimetric analysis, and near-edge X-ray absorption fine structure examination, we show evidence for the formation of a layered, graphitic carbon in the matrix and how the process occurs. The identification of thermally and electrically conductive graphitic carbon host formation is important for the further development of this general ligandfree synthetic approach for inorganic nanocrystal growth in the solid state, and can be extended to form a range of transition metals pyrophosphates. For important energy storage applications, the method gives the ability to form oxide and (pyro)phosphates within a conductive, intercalation possible, graphitic carbon as host-guest composites directly on substrates for high rate Li-ion battery and emerging alternative positive electrode materials.

show abstract

“…The catalyst exhibits a typical face-centred cubic (FCC) pattern, with the diffraction peaks at ~ 39°, 46° and 67°, assigned to the corresponding (111), (200) and (220), respectively ( Figure 2). Several graphitic reflections are evident, the strongest of which is a sharp, symmetrical peak at 2θ = 26.3° assigned as the [002] plane of graphite 35,36 . The broad peaks in the XRD patterns indicate the small sizes of nanocrystals.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

reKinetics and Mass Transfer in the Hydrogenation of 2-((1-benzyl-1,2,3,6-tetrahydropyridin-4-yl)methylene)-5,6-dimethoxy- -2,3-dihydroinden-1-one hydrochloride over Pt/C Catalyst

Zrnčević¹

2015

Chem.Biochem.Eng.Q.

View full text Add to dashboard Cite

The liquid phase hydrogenation of 2-((1-benzyl-1,2,3,6-tetrahydropyridin-4-yl) methylene)-5,6-dimethoxy-2,3-dihydroinden-1-one hydrochloride (1) over a 5 % Pt/C industrial catalyst was studied experimentally in a batch slurry reactor using methanol as a solvent. The catalyst was characterized by the adsorption techniques for specific surface area and pore volume, and by XRD for crystallinity. To investigate the intrinsic kinetics of the reaction, the effect of temperature, catalyst loading, hydrogen partial pressure and (1) concentration on the initial rate of hydrogenation was studied. The analysis of initial rate data showed that the gas-liquid, liquid-solid, and intraparticle mass-transfer resistances were not significant. The reaction scheme of (1) hydrogenation was proposed for the kinetic modelling. Apparent rate constants for all hydrogenation steps were calculated using a first order kinetic approach resulting in good agreement between the experimentally obtained and predicted concentrations. From the temperature dependence of rate constants, the activation energies of various reaction steps were calculated. The averaged activation energy of these steps was found to be 31.1 kJ mol -1 .

show abstract

High-thermal-conductivity, mesophase-pitch-derived carbon foams: effect of precursor on structure and properties

Cited by 420 publications

References 19 publications

Nickel nanoparticles embedded in carbon foam for improving electromagnetic shielding effectiveness

Nickel nanoparticles embedded in carbon foam for improving electromagnetic shielding effectiveness

Layered Graphitic Carbon Host Formation during Liquid-free Solid State Growth of Metal Pyrophosphates

reKinetics and Mass Transfer in the Hydrogenation of 2-((1-benzyl-1,2,3,6-tetrahydropyridin-4-yl)methylene)-5,6-dimethoxy- -2,3-dihydroinden-1-one hydrochloride over Pt/C Catalyst

Contact Info

Product

Resources

About