Pengaruh teknik pengeringan yang berbeza terhadap ketumpatan, keliangan dan kebioaktifan β-wolastonit daripada batu kapur tempatan dan jerami padi

Translated title of the contribution: Effect of different drying techniques on density, porosity and bioactivity of β-wollastonite from local limestone and rice straw

Hamisah Ismail, Shun Xiang Yau, Roslinda Shamsudin, Muhammad Azmi Abdul Hamid

Research output: Contribution to journalArticle

Abstract

The influences of different drying techniques on the density, porosity and bioactivity of β-wollastonite samples were studied and compared between two drying techniques; freeze-dried at -40°C and in an incubator at body temperature (36.5°C). β-wollastonite samples were produced from calcined limestone and rice straw ash with CaO:SiO 2 ratio of 45:55. The mixture was autoclaved for 8 h, and then dried and sintered at 950°C for 3 h. β-wollastonite samples were formed into cylinders and dried using two techniques, namely the freeze drying technique at -40°C for 12 h and at body temperature (36.5°C) for two days in an incubator. Then, the cylindrical samples were examined for their density, porosity and bioactivity properties. It was found that the freeze drying technique had produced denser β-wollastonite samples, (3.20 gcm -3 ) compared to drying at body temperature drying, (3.03 gcm -3 ). Freeze-dried samples had less pores compared to samples dried at body temperature, at 47.5% and 53.8%, respectively. In terms of bioactivity properties, after 21 days of immersion in the SBF solution, amorphous calcium phosphate (ACP), with Ca/P molar ratio that ranged between 1.2 - 2.0 and calcium deficient hydroxyapatite (CDHA), with a Ca/P molar ratio of 1.5 - 1.67 were found on the surface of the samples for both drying techniques.

Original languageMalay
Pages (from-to)165-172
Number of pages8
JournalSains Malaysiana
Volume48
Issue number1
DOIs
Publication statusPublished - 1 Jan 2019

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calcium silicate
rice straw
limestone
porosity
drying
body temperature
sampling
incubators (equipment)
freeze drying
methodology
hydroxyapatite
calcium phosphates
calcium

ASJC Scopus subject areas

  • General

Cite this

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title = "Pengaruh teknik pengeringan yang berbeza terhadap ketumpatan, keliangan dan kebioaktifan β-wolastonit daripada batu kapur tempatan dan jerami padi",
abstract = "The influences of different drying techniques on the density, porosity and bioactivity of β-wollastonite samples were studied and compared between two drying techniques; freeze-dried at -40°C and in an incubator at body temperature (36.5°C). β-wollastonite samples were produced from calcined limestone and rice straw ash with CaO:SiO 2 ratio of 45:55. The mixture was autoclaved for 8 h, and then dried and sintered at 950°C for 3 h. β-wollastonite samples were formed into cylinders and dried using two techniques, namely the freeze drying technique at -40°C for 12 h and at body temperature (36.5°C) for two days in an incubator. Then, the cylindrical samples were examined for their density, porosity and bioactivity properties. It was found that the freeze drying technique had produced denser β-wollastonite samples, (3.20 gcm -3 ) compared to drying at body temperature drying, (3.03 gcm -3 ). Freeze-dried samples had less pores compared to samples dried at body temperature, at 47.5{\%} and 53.8{\%}, respectively. In terms of bioactivity properties, after 21 days of immersion in the SBF solution, amorphous calcium phosphate (ACP), with Ca/P molar ratio that ranged between 1.2 - 2.0 and calcium deficient hydroxyapatite (CDHA), with a Ca/P molar ratio of 1.5 - 1.67 were found on the surface of the samples for both drying techniques.",
keywords = "Bioactivity, Density, Porosity, Rice straw ash, β-wollastonite",
author = "Hamisah Ismail and Yau, {Shun Xiang} and Roslinda Shamsudin and {Abdul Hamid}, {Muhammad Azmi}",
year = "2019",
month = "1",
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doi = "10.17576/jsm-2019-4801-19",
language = "Malay",
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pages = "165--172",
journal = "Sains Malaysiana",
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T1 - Pengaruh teknik pengeringan yang berbeza terhadap ketumpatan, keliangan dan kebioaktifan β-wolastonit daripada batu kapur tempatan dan jerami padi

AU - Ismail, Hamisah

AU - Yau, Shun Xiang

AU - Shamsudin, Roslinda

AU - Abdul Hamid, Muhammad Azmi

PY - 2019/1/1

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N2 - The influences of different drying techniques on the density, porosity and bioactivity of β-wollastonite samples were studied and compared between two drying techniques; freeze-dried at -40°C and in an incubator at body temperature (36.5°C). β-wollastonite samples were produced from calcined limestone and rice straw ash with CaO:SiO 2 ratio of 45:55. The mixture was autoclaved for 8 h, and then dried and sintered at 950°C for 3 h. β-wollastonite samples were formed into cylinders and dried using two techniques, namely the freeze drying technique at -40°C for 12 h and at body temperature (36.5°C) for two days in an incubator. Then, the cylindrical samples were examined for their density, porosity and bioactivity properties. It was found that the freeze drying technique had produced denser β-wollastonite samples, (3.20 gcm -3 ) compared to drying at body temperature drying, (3.03 gcm -3 ). Freeze-dried samples had less pores compared to samples dried at body temperature, at 47.5% and 53.8%, respectively. In terms of bioactivity properties, after 21 days of immersion in the SBF solution, amorphous calcium phosphate (ACP), with Ca/P molar ratio that ranged between 1.2 - 2.0 and calcium deficient hydroxyapatite (CDHA), with a Ca/P molar ratio of 1.5 - 1.67 were found on the surface of the samples for both drying techniques.

AB - The influences of different drying techniques on the density, porosity and bioactivity of β-wollastonite samples were studied and compared between two drying techniques; freeze-dried at -40°C and in an incubator at body temperature (36.5°C). β-wollastonite samples were produced from calcined limestone and rice straw ash with CaO:SiO 2 ratio of 45:55. The mixture was autoclaved for 8 h, and then dried and sintered at 950°C for 3 h. β-wollastonite samples were formed into cylinders and dried using two techniques, namely the freeze drying technique at -40°C for 12 h and at body temperature (36.5°C) for two days in an incubator. Then, the cylindrical samples were examined for their density, porosity and bioactivity properties. It was found that the freeze drying technique had produced denser β-wollastonite samples, (3.20 gcm -3 ) compared to drying at body temperature drying, (3.03 gcm -3 ). Freeze-dried samples had less pores compared to samples dried at body temperature, at 47.5% and 53.8%, respectively. In terms of bioactivity properties, after 21 days of immersion in the SBF solution, amorphous calcium phosphate (ACP), with Ca/P molar ratio that ranged between 1.2 - 2.0 and calcium deficient hydroxyapatite (CDHA), with a Ca/P molar ratio of 1.5 - 1.67 were found on the surface of the samples for both drying techniques.

KW - Bioactivity

KW - Density

KW - Porosity

KW - Rice straw ash

KW - β-wollastonite

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DO - 10.17576/jsm-2019-4801-19

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JO - Sains Malaysiana

JF - Sains Malaysiana

SN - 0126-6039

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