Sains Malaysiana 47(4)(2018): 819-827

http://dx.doi.org/10.17576/jsm-2018-4704-22

Pengaruh Suhu Sinteran terhadap Kebioaktifan Wolastonit daripada Abu Sekam Padi dan Batu Kapur

(Influence of Sintering Temperature on the Bioactivity of Wollastonite Derived from Rice Husk Ash and Limestone)

FARAH ATIQAH ABDUL AZAM¹, HAMISAH ISMAIL¹, ROSLINDA SHAMSUDIN¹*, MIN HWEI NG², ZALITA ZAINUDDIN¹ & MUHAMMAD AZMI ABDUL HAMID¹

¹Pusat Pengajian Fizik Gunaan, Fakulti Sains & Teknologi, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

²Pusat Kejuruteraan Tisu Tingkat 12, Blok Klinikal, Pusat Perubatan Universiti Kebangsaan Malaysia, 56000 Cheras, Kuala Lumpur, Wilayah Persekutuan, Malaysia

Diserahkan: 18 September 2017/Diterima: 7 November 2017

ABSTRAK

Tujuan kajian ini adalah untuk mengenal pasti kesan rawatan suhu yang berbeza terhadap kebioaktifan wolastonit yang disintesis menggunakan teknik sol gel. Abu sekam padi dan batu kapur digunakan sebagai bahan awalan untuk menghasilkan wolastonit. Nisbah campuran kalsium oksida dan silika dioksida CaO/SiO₂ ditentukan pada 55:45 dan dimasukkan ke dalam autoklaf pada suhu 135°C dengan tekanan 0.26 MPa selama 8 jam. Campuran serbuk CaO dan SiO₂ tersebut disinter pada suhu yang berbeza (1150°C dan 1250°C) dan diuji sifat kebioaktifan secara rendaman dalam larutan cecair badan tersimulasi (SBF) selama 1,3,5,7 dan 14 hari secara in vitro. Sifat fizikal dan kebioaktifan wolastonit sebelum dan selepas direndam dalam larutan SBF dan beberapa pencirian telah dijalankan menggunakan teknik analisis XRD, FESEM, EDX dan FTIR. Campuran serbuk CaO-SiO₂ yang telah diautoklaf dan disinter pada suhu 1250°C menghasilkan puncak tunggal pseudowolastonit. Ujian kebioaktifan menunjukkan lapisan amorfus kalsium fosfat (ACP) dengan julat nisbah Ca/P 1.9-1.51 terbentuk lebih pantas pada sampel wolastonit yang disinter pada suhu 1250°C berbanding pembentukan ACP pada sampel tersinter 1150°C.

Kata kunci: Abu sekam padi; batu kapur; kebioaktifan; wolastonit

ABSTRACT

The aim of this work was to identify the sintering effect on the in-vitro bioactivity of the synthesized wollastonite material using sol gel method. Rice husk ash and calcium oxide from limestone were taken as a precursor to produce wollastonite. Calcium oxide and silicon dioxide CaO/SiO₂ were measured at an average ratio of 55:45 and placed in an autoclave at the temperature of 135°C with 0.26 MPa pressure for 8 h. The CaO and SiO₂ powder mixtures have been sintered at different temperatures (1150°C and 1250°C) and then immersed in a simulated body liquid (SBF) solution for 1,3,5,7 and 14 days for in vitro bioactivity test. The physical properties and wolastonite bioactivity before and after immersed in SBF solution and some characterizations were carried out using XRD, FESEM, EDX and FTIR analysis techniques. The autoclaved CaO-SiO₂ powder mixture sintered at 1250°C yields a single peak of pseudowolastonite. The bioactivity test showed that, the amorphous layer of calcium phosphate (ACP) with the Ca/P ratio of 1.9-2.01 was formed faster on wolastonite samples sintered at 1250°C compared to the formation of ACP layer for sample sintered at 1150°C.

Keywords: Bioactivity; limestone; rice husk ash; wollastonite

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*Pengarang untuk surat-menyurat; email: linda@ukm.edu.my