Showing papers in "Carbon in 1965"

TL;DR: The formation of graphitizing low-temperature carbons by solidification from a liquid phase proceeds via the separation of a mesophase having properties similar to those of liquid crystals.

TL;DR: A new carbon fiber was prepared from the molten pyrolysis products such as Polyvinylchloride pitch (PVC pitch) which are prepared by heating at 400°C under nitrogen as mentioned in this paper.

TL;DR: In this paper, the results of a molecular probe study on two Saran carbons prepared up to 1000°C and on polyvinylidene chloride carbons made up to 1500°C are reported.

TL;DR: In this paper, a variety of pyrolytic-carbon structures were classified into three groups according to their structure, i.e., laminar, isotropic, or granular.

TL;DR: In this paper, the structural changes which occur when single crystals of α silicon carbide (6H) are heated in vacuo, have been studied by using X-ray diffraction methods.

TL;DR: In this paper, the lattice spacing of polyvinylchloride coke, petroleum coke based carbon and glassy carbon were investigated under high pressure using a modified anvil type high pressure apparatus.

TL;DR: In this paper, it was shown that the divalent state of the metal enters into the oxidation mechanism of the graphite in a manner similar to that proposed by Long and Sykes.

TL;DR: In this paper, an improved temperature arrangement operating from room temperature down to liquid nitrogen was constructed, which permits one to perform speedy measurements with a minimum of corrections involved, and it is shown that the intensity vs. temperature curves for P33 can be split into a sum of contributions of localized spin centers and conduction carriers; the irradiation producing mainly localized spins and the doping changing only the carrier concentration.

TL;DR: In this article, the true kinetics of the attack of high temperature graphite by both atomic and diatomic oxygen have been studied using microwave discharge-fast flow system techniques, and it was shown that in the surface temperature range 1100°K-2000°K the oxidation probability for O-atom attack exceeds that for O 2, by factors between 5 and as much as 80, and that the O 2 attack probability is independent of oxygen partial pressure (corresponding to a first order reaction).

TL;DR: The combined oxygen that decomposes to evolve carbon dioxide (termed tentatively as CO2-complex) appears to play a significant role in determining surface acidity, polarity, chemisorption of water and methanol, heat of immersion in water and selective adsorption from binary solutions as mentioned in this paper.

TL;DR: In this paper, changes in the X-ray lattice parameters of Grade A graphite have been studied in detail during isothermal irradiations to high doses in the temperature range 200 −350°C.

TL;DR: In this paper, the authors compared the mechanical properties of pyrolytic carbon deposits to their structure, which in turn depends on the deposition conditions and subsequent heat treatment, and found that the fracture strain was highest in the isotropic and laminar structures.

TL;DR: In this article, it was shown that intercalation starts in the spaces adjacent to the outer two basal planes and proceeds to the central layer of pyrolytic graphite.

TL;DR: In this paper, a variety of carbons were studied using X-ray scattering techniques to determine the concentration of amorphous carbon and misaligned single layers in each of them.

TL;DR: In this paper, the correlation of structural anisotropy with the normal spectral emissivity of pyrolytic graphite is discussed relative to polycrystalline graphite and to isotropic single crystal nickel.

TL;DR: Adsorption of iodine by carbon blacks from aqueous, chloroform and benzene solutions was studied and conditions for estimating surface areas of carbon blacks were standardized as discussed by the authors.

TL;DR: In this article, a polarized light analysis of aliphatic polymers at 700°C has been carried out to detect graphitic or non-graphitic properties of polycyclic residues.

TL;DR: In this paper, the energy required to displace a carbon atom from its normal lattice site has been determined directly by detection of the lattice vacancies resulting from the displacement process.

TL;DR: In this article, a modified Bacon preferred-orientation technique was used in studies of film carbons deposited in fluidized beds, and the authors calculated absorption factors for a modified bacon preferred orientation technique for specimen sizes and densities.

TL;DR: In this article, the electron spin resonance has been studied for a representative group of variously heat treated carbon blacks using a 3-cm spectrometer equipped with a variable temperature dewar in the cavity.

TL;DR: In this paper, the results of graphite irradiations carried out in the Dounreay Fast Reactor are discussed in terms of current theories of dimensional changes and radiation creep; the dimensional changes follow the trends expected but a high tensile creep strain (> 2%) is observed.

TL;DR: In this article, the reaction of a spherical specimen (1 in. diameter) of ATJ graphite with low partial pressures of carbon dioxide and water vapor were determined in flowing helium at a total pressure of 1 atm.

TL;DR: The influence of ambient gas phase on the graphitization rate of carbons was investigated in this article, where a calcined petroleum coke was heat treated in a high purity graphite tube furnace for various residence times at a maximum temperature ranging from 1900°-2400°C under air pressure of 4, 2 and 0.1 Torr.

TL;DR: An electron microscopic examination has been made of the structural changes taking place when carbon blacks were heated at temperatures up to 3000°C as mentioned in this paper, showing a marked striation pattern with a periodicity of 30 A, which may be compared with L c ~44 A as measured by X-rays.

TL;DR: In this article, a theoretical analysis of carbon-deposition kinetics was developed to take into account a back-reaction in a simple kinetic case and has been applied to experimental data for deposition from C3O2 in the presence of CO.

TL;DR: In this article, the reaction rates of ozone with single crystals of graphite have been measured separately in the directions parallel and perpendicular to the layer planes, by using the techniques of etch decoration.

TL;DR: Proportionality between oxidation rate and accessible pore volume is again observed except in the case of heavily oxidised specimens, which suggests that ineffective radiolysis of gas occurs at the centre of large pores in these cases.