Particle formation of hydroxyapatite precursor containing two components in a spray pyrolysis process

doi:10.1007/s11705-014-1406-1

Front Chem Sci Eng

2014, Vol. 8

Issue (1) : 104-113 https://doi.org/10.1007/s11705-014-1406-1

RESEARCH ARTICLE

Particle formation of hydroxyapatite precursor containing two components in a spray pyrolysis process

W. Widiyastuti¹(

), Adhi Setiawan², Sugeng Winardi¹, Tantular Nurtono¹, Heru Setyawan¹

1. Department of Chemical Engineering, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya 60111, Indonesia; 2. Politeknik Perkapalan Negeri Surabaya, Kampus ITS Sukolilo, Surabaya 60111, Indonesia

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Abstract

The particle formation mechanism of hydroxyapatite precursor containing two components, Ca(OOCCH₃)₂ and (NH₄)₂HPO₄ with a ratio of Ca/P= 1.67, in a spray pyrolysis process has been studied by computational fluid dynamics (CFD) simulation on the transfer of heat and mass from droplets to the surrounding media. The focus included the evaporation of the solvent in the droplets, a second evaporation due to crust formation, the decomposition reaction of each component of the precursor, and a solid-state reaction that included the kinetic parameters of the precursor regarding its two components that formed the hydroxyapatite product. The rate of evaporation and the reacted fraction of the precursor both increased with temperature. The predicted average size of the hydroxyapatite particles agreed well with the experimental results. Therefore, the selected models were also suitable for predicting the average size of particles that contain two components in the precursor solution.

Keywords droplet hydroxyapatite particle CFD tubular furnace spray pyrolysis

Corresponding Author(s): Widiyastuti W.,Email:widi@chem-eng.its.ac.id

Issue Date: 05 March 2014

Cite this article:

W. Widiyastuti,Adhi Setiawan,Sugeng Winardi, et al. Particle formation of hydroxyapatite precursor containing two components in a spray pyrolysis process[J]. Front Chem Sci Eng, 2014, 8(1): 104-113.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-014-1406-1
https://academic.hep.com.cn/fcse/EN/Y2014/V8/I1/104

Fig.1 Experimental set-up for spray pyrolysis

Fig.2 Temperature distribution of the furnace with a carrier gas-flow rate of 1 L/min for furnace temperatures of (a) 773 K, (b) 973 K, (c) 1173 K, and (d) 1273 K

Fig.3 (a) Temperature distribution, and validation, as predicted by CFD along the axial direction at the center of the furnace with a carrier gas-flow rate of 1 L/min and a furnace temperature of 473 K; (b) temperature distribution by CFD along the axial direction at the center of the furnace for different furnace wall temperatures

Fig.4 Thermo-gravimetric and differential analyses (TG-DTA) for a precursor containing both Ca(OOCCH) and (NH)HPO

Fig.5 Activation energy of decomposition for the Ca(OOCCH) and (NH)HPO mixtures

Fig.6 The kinetic model for describing the decomposition of a precursor

Fig.7 (a) Particle size shrinkage and (b) evaporation rate at various temperatures

Fig.8 The fraction reactions of HAp precursor at various furnace temperatures

Fig.9 SEM images of HAp particles synthesized at furnace temperatures of (a) 773 K, (b) 973 K, (c) 1173 K, and (d) 1273 K

Fig.10 HAp particle size distribution synthesized at furnace temperatures of (a) 773 K, (b) 973 K, (c) 1173 K, and (d) 1273 K.

Fig.11 XRD patterns of hydroxyapatite synthesized by spray pyrolysis at various furnace wall temperatures

Fig.12 Average particle size comparison between the experiment and the simulation

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