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Fractal Analysis of Hydroxyapatite from Nitrogen Isotherms by Gamal M.S El Shafei; Christine A Philip; Nabawaya A Moussa is a Chemistry article available to read on EtoBox.

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Samples of calcium hydroxyapatite, CaHap, were prepared via a wet method and subjected to thermal treatment in air in the temperature range 100-900 degrees C. Nitrogen adsorption-desorption isotherms were obtained on different samples, and their data points were used to analyze the fractal properties of the obtained solids. Both FHH and Neimark's equations were used for such purpose, and the agreement or disagreements between obtained results on using both equations are discussed. Considering the appropriate values of the obtained surface fractal dimensions D, it was concluded that an appreciable defractalization of the prepared hydroxyapatite is only noted upon calcinations at 900 degrees C. Below this temperature the loss in surface area and pore volume result from simultaneous bulk and surface mass transport, which conserve the initial surface roughness and average pore radius. Calcination at 900 degrees C caused sintering to proceed via bulk mass transport, with a consequent pore widening and a decrease in surface roughness.

Who reads Fractal Analysis of Hydroxyapatite from Nitrogen Isotherms?

Author

Gamal M.S El Shafei; Christine A Philip; Nabawaya A Moussa

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0021-9797)

Published

2004

Language

EN

Field

Chemistry (Physical Sciences)