β Scribed by K.K. Bardhan; D.D.L. Chung
No coin nor oath required. For personal study only.
The kinetics of the intercalation of graphite was investigated by measuring the c-face surface profiles during the intercalation of Br, into highly-oriented pyrolytic graphite cylindrical discs at room temperature. A sharp intercalate front was observed to advance while the surface profile evolved from a bucket-shape to a V-shape, as predicted by the model of interface-controlled intercalation proposed by the authors [l I]. The average magnitude of the steady velocity of the front was 5 15 &sec; the initial period was marked by a larger velocity attributed to an edge effect. The same behavior was observed during ICl intercalation at room temperature. During desorption, inverted surface profiles were obtained, indicating that desorption may be the reverse of intercalation.
In the case of HN03 intercalation at room temperature, bowl-shaped surface profiles were observed. Preliminary profile measurements were made during ICl intercalation at WC, at which the intercalate layers are known to be disordered.
π SIMILAR VOLUMES
model of first rapid intercalation is presented to describe the kinetics of intercalation. The model applies to interface-controlled intercalation, as for the intercalation of Br, and other similar intercalates. In this model, intercalation proceeds by layer-by-layer nucleation and subsequent in-pla
Samples of stage-2 fluorine graphite intercalation compounds (GIC) were studied by scanning tunneling microscope (STM) from submicrometer to atomic scale. From the STM view point, the most striking observation concerns the topographic modifications of the \((a, b)\) sample surface induced by the int
Kinetic and isotherm data for the weight increase of six graphites in AsF, vapor up to 8000 mm at 20Β°C support the production of C\*AsF, and the rapid post-intercalation conversion to C,,AsF, and AsF,. At any time during intercalation, reduction of the pressure to I pm lowers the weight by the calcu
The intercalation of graphite by boron trichloride has been studied at 17 and 63Β°C using a two-limb tube technique. The 17Β°C isothermal uptake curve shows only one composition which is stable over an appreciable range of BC1s partial pressure values. This composition is C8sBC13. The 63Β°C isotherm sh