Kinetics of graphitization in glassy carbon

Saxena, R. R.; Bragg, Robert H.

doi:10.1016/0008-6223(78)90077-5

Cited by 28 publications

(15 citation statements)

References 6 publications

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“…When treated under high temperatures and high pressures, GC probably has high internal stresses since its shape varied significantly. However, the effect of the growth of finite crystalline sizes would exceed that of the strain-induced broadening as temperature increases [14] . The structure slowly evolves toward the ideal graphite structure, and the enhanced crystal formation is indicated by the appearance of higher and sharp peaks.…”

Section: Resultsmentioning

confidence: 99%

The unusual morphology, structure, and magnetic property evolution of glassy carbon upon high pressure treatment

Chen¹,

Wang²,

Liu³

et al. 2003

Braz. J. Phys.

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Glassy carbon (GC) has been high-pressure high-temperature treated. An interesting morphology evolution from the pristine sample to the high pressure products was observed. It is found that GC can be graphitized under pressure at a temperature much lower than that at ambient condition. Furthermore the in − situ structure and electrical measurements of GC and graphitized glassy carbon (GGC) under high temperature and high pressure have been investigated up to 30 GPa. We particularly emphasize the unusual magnetic properties of GC treated under high pressures and high temperatures. A paramagnetic to ferromagnetic-like, and then to superconducting (a diamagnetic signal with hysteresis magnetic response) -like behavior, which can be observed at temperatures as high as 80 K, appears as a successive evolution from the initial GC to GGC in accordance with three regions distinguished by the graphitization temperature. This interesting evolution of magnetic properties probably evokes the new understanding of carbon element.

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Section: Resultsmentioning

confidence: 99%

The unusual morphology, structure, and magnetic property evolution of glassy carbon upon high pressure treatment

Chen¹,

Wang²,

Liu³

et al. 2003

Braz. J. Phys.

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show abstract

“…10. The observed value of ~ H ::: 30 kcal/mole is much lower than the ~ H for graphitization ( ::: 215 kcal/mole) found for glassy carbon [13]. A possible explanation for this effect is discussed below.…”

Section: Resultsmentioning

confidence: 76%

“…Saxena and Bragg [13] Clearly, any process which alters the characteristics of the lath-like ribbons must necessarily change the structure of the pores which they enclose. Thus, pore growth would appear to be related to thegraphitization process taking place.…”

Section: Resultsmentioning

confidence: 99%

“…Graphitization in glassy carbon is a very slow process (for example, k at 2500°C for L increase ~.005 hr-1 [13]); thus the quantity a kt is small. As a result, the quantity in brackets on the righthand side of Eq.…”

Section: Resultsmentioning

confidence: 99%

“…Saxena and Bragg [13] and Henry and Bragg [16] have shown that a decrease in d 002 does not occur in glassy carbon below heat treatment temperatures of about 2200°C. Thus, at temperatures greater than 2200°C…”

Section: Discussionmentioning

confidence: 99%

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Study of pore growth in glassy carbon using small angle x-ray scattering

Hoyt¹

1982

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Small angle x-ray scattering was used to study the average pore size in glass-like carbon as a function of both heat treatment time and heat treatment temperature. A pore growth model based on graphitization processes is presented. The simple mechanism shows" that the change "in the average radius of gyration with time is related to the total number of pores as a function of time, which in turn depends on the irreversible thermal expansion phenomenon. The results of this study are inconsistent with a vacancy migration pore growth mechanism proposed earlier.

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Mechanically Robust Self‐Organized Crack‐Free Nanocellular Graphene with Outstanding Electrochemical Properties in Sodium Ion Battery

Park,

Han,

Moon

et al. 2024

Advanced Materials

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Crack‐free nanocellular graphenes are attractive materials with extraordinary mechanical and electrochemical properties, but their homogeneous synthesis on the centimeter scale is challenging. Here, a strong nanocellular graphene film achieved by the self‐organization of carbon atoms using liquid metal dealloying and employing a defect‐free amorphous precursor is reported. This study demonstrates that a Bi melt strongly catalyzes the self‐structuring of graphene layers at low processing temperatures. The robust nanoarchitectured graphene displays a high‐genus seamless framework and exhibits remarkable tensile strength (34.8 MPa) and high electrical conductivity (1.6 × 104 S m−1). This unique material has excellent potential for flexible and high‐rate sodium‐ion battery applications.

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Kinetics of graphitization in glassy carbon

Cited by 28 publications

References 6 publications

The unusual morphology, structure, and magnetic property evolution of glassy carbon upon high pressure treatment

The unusual morphology, structure, and magnetic property evolution of glassy carbon upon high pressure treatment

Study of pore growth in glassy carbon using small angle x-ray scattering

Mechanically Robust Self‐Organized Crack‐Free Nanocellular Graphene with Outstanding Electrochemical Properties in Sodium Ion Battery

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