Thermal properties of natural nanostructured hydroxyapatite extracted from fish bone waste

Abstract

In a previous study, natural hydroxyapatite (HAp) from the bones of Brazilian river fish was calcined at 900 °C (4–12 h), and optical characterization using the near infrared photoacoustic spectroscopy technique enabled the establishment of 8 h as the best calcination time for nanostructure stabilization when milled in a high-energy milling device [T. M. Coelho, E. S. Nogueira, W. R. Weinand, W. M. Lima, A. Steimacher, A. N. Medina, M. L. Baesso, and A. C. Bento, J. Appl. Phys. 100, 094312 (2006)]. The fish wastes used were from species such as pintado (Pseudoplatystoma corruscans), jaú (Paulicea lutkeni), and cachara (Pseudoplatystoma fasciatum). In this study, the characterization of the thermal properties of the same natural HAp is discussed for samples milled from 0 to 32 h, with nanostructures from 80 to 24 nm. The powders were pressed into disks at 350 MPa and sintered for 4 h at 1000 °C. Thermophysical parameters were obtained by thermal wave interferometry and nonadiabatic relaxation calorimetry. Results for thermal diffusivity and thermal conductivity showed that the parameters increase with milling time, although they present a transition (a plateau) in the interval from 8 to 16 h. Two different slopes were observed and this was interpreted as being due to the size of the crystallites, which fall rapidly, dropping from 80 nm to near 22 nm when milling time is increased from 0 to 16 h, and forming agglomerates up to 32 h.

On the modulation frequency dependence of the photoacoustic signal for a metal coated glass-liquid system

“…Its antecedents can be found in the pioneering work of Bennett and Patty [6] and its basic principles, that are well described in the book of Almond and Patel [7], have been used in the past principally for coating characterization, particularly for thickness and thermal property measurements [8][9][10][11][12][13][14][15]. The concept of thermal wave interference has gained considerable attention for gas and liquid-phase applications after Shen and Mandelis [16] demonstrated the feasibility of detecting a thermal wave propagating across the gap (designed as thermal wave resonator by the authors) formed between two walls, one acting as the generator and the other as a temperature sensor.…”

Physical Characterization of Turbot (Psetta Maxima) Originated Natural Hydroxyapatite

“…• C. Here in this study the size of crystallites has dropped from 80 nm to nearly 22 nm when the time of milling was increased from 0 to 16 hours and agglomerates have formed at up to 32 hours [6].…”

Naturally derived biomaterials for development of composite bone scaffold: A review

“…HAp derived from high temperature sintering of fish scales [80,81], fish bone [82,83], bovine bone [84] and pig bone [85] have also been used for development of composite bone scaffolds. Thus it is seen that bioceramic HAp has been derived from a wide range of natural sources like corals, algae and shells and biowaste maerials like eggshells, scales and bones.…”