Chiang Mai Journal of Science, Faculty of Science, Chiang Mai University

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Preparation of Nano-hydroxyapatite Particles by Ultrasonic Method at 25 kHz Using Natural Rubber Latex as a Templating Agent

Paper Type	Contributed Paper
Title	Preparation of Nano-hydroxyapatite Particles by Ultrasonic Method at 25 kHz Using Natural Rubber Latex as a Templating Agent
Author	Songkot Utara [a,b]*, Jutharatana Klinkaewnarong [a,c]
Email	songkot_u@hotmail.com; songkot@udru.ac.th.
Abstract: Natural rubber latex (1% DRC) was used as a templating agent for the preparation of nano-hydroxyapatite (HAp) powder using an ultrasonic technique at a constant temperature of 25^oC (25 kHz). Di-ammonium hydrogen phosphate ((NH₄)₂ HPO₄) and calcium nitrate tetrahydrate (Ca(NO₃)₂.4H₂O) were used as starting materials. The study investigated the effects of increasing sonication time (0, 20, 40 and 60 min) and effect of Ca:P ratios (1.67 and 1.50) on the properties of calcium phosphate (Ca_10−x(HPO₄)_x(PO₄)_6−x(OH)₂₋_x, x = 0 and x = 1). To obtain HAp, latex containing calcium phosphate was dried at 60^oC and calcined at 600^oC for 2 hours. The thermal properties, crystallinity, functionality and morphology of the powders were evaluated using thermo-gravimetric analysis (TGA), X-ray diffraction (XRD), Fourier transform Raman spectroscopy (FT-Raman) and transmission electron microscopy (TEM). The XRD results confirmed formation of mixed phases of HAp and β-TCP in all synthesised HAp samples. Both the crystalline size and crystalline material fraction (as %) of x = 0 were higher than for x = 1. After 20 minutes, these two properties tended to decrease with increasing sonication time. FT-Raman studies also revealed the presence of OH^- in the hydroxyapatite phase with longer sonication times, with the ((PO^-3₄)) mode (962 cm^-1) being present for both x = 0 and x = 1. TEM images demonstrated decreasing HAp particle diameters with increasing sonication time. These subsequently formed longer, nano- rod-like shapes in the case of calcium-deficient HAp (x = 1).
Start & End Page	320 - 328
Received Date	2015-09-15
Revised Date
Accepted Date	2015-11-02
Full Text	Download
Keyword	Hydroxyapatite, Ultrasonic method, Natural rubber latex, Templating agent
Volume	Vol.43 No.2 (SPECIAL ISSUE 1)
DOI
Citation	[a S.U., B]* , [a J.K. and C] , Preparation of Nano-hydroxyapatite Particles by Ultrasonic Method at 25 kHz Using Natural Rubber Latex as a Templating Agent , Chiang Mai Journal of Science, 2016; 43(2): 320-328.
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Preparation of Nano-hydroxyapatite Particles by Ultrasonic Method at 25 kHz Using Natural Rubber Latex as a Templating Agent

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