Che Wan Sharifah Robiah Mohamad
Thumbnail Image
Preferred name
Che Wan Sharifah Robiah Mohamad
Official Name
Che Wan Sharifah Robiah, Mohamad
Alternative Name
Mohamad, Che Wan Sharifah Robiah
Mohamad, C. W.S.Robiah
Mohamad, Che Wan Syarifah Robiah
Mohamad, C. W.S.R.
Main Affiliation
Scopus Author ID
57194056639
Researcher ID
FNL-7708-2022

Research Output

Filters

2
2
2
Reset filters

Settings
Now showing 1 - 2 of 2
Thumbnail Image
Publication

Complex Impedance and Modulus Analysis on Porous and Non-Porous Scaffold Composites Due to Effect of Hydroxyapatite/Starch Proportion

2023-01-01 , Beh C.Y. , Cheng Ee Meng , Tan X.J. , Mohd Nasir N.F. , Mohd Shukry Abdul Majid , Mohd Ridzuan Mohd Jamir , Khor Shing Fhan , Lee K.Y. , Che Wan Sharifah Robiah Mohamad

This study aims to investigate the electric responses (complex modulus and complex impedance analysis) of hydroxyapatite/starch bone scaffold as a function of hydroxyapatite/starch proportion and the microstructural features. Hence, the non-porous and porous hydroxyapatite/starch composites were fabricated with various hydroxyapatite/starch proportions (70/30, 60/40, 50/50, 40/60, 30/70, 20/80, and 10/90 wt/wt%). Microstructural analysis of the porous hydroxyapatite/starch composites was carried out by using scanning electron microscopy. It shows that the formation of hierarchical porous microstructures with high porosity is more significant at a high starch proportion. The complex modulus and complex impedance analysis were conducted to investigate the electrical conduction mechanism of the hydroxyapatite/starch composites via dielectric spectroscopy within a frequency range from 5 MHz to 12 GHz. The electrical responses of the hydroxyapatite/starch composites are highly dependent on the frequency, material proportion, and microstructures. High starch proportion and highly porous hierarchical microstructures enhance the electrical responses of the hydroxyapatite/starch composite. The material proportion and microstructure features of the hydroxyapatite/starch composites can be indirectly reflected by the simulated electrical parameters of the equivalent electrical circuit models.

View
Thumbnail Image
Publication

Lumped-Element Circuit Modeling for Composite Scaffold with Nano-Hydroxyapatite and Wangi Rice Starch

2023-01-01 , Tan X.J. , Cheng Ee Meng , Mohd Shukry Abdul Majid , Nashrul Fazli Mohd Nasir , Lee K.Y. , You K.Y. , Mohd Ridzuan Mohd Jamir , Che Wan Sharifah Robiah Mohamad , Khor Shing Fhan

Mechanistic studies of the interaction of electromagnetic (EM) fields with biomaterials has motivated a growing need for accurate models to describe the EM behavior of biomaterials exposed to these fields. In this paper, biodegradable bone scaffolds were fabricated using Wangi rice starch and nano-hydroxyapatite (nHA). The effects of porosity and composition on the fabricated scaffold were discussed via electrical impedance spectroscopy analysis. The fabricated scaffold was subjected to an electromagnetic field within the X-band and Ku-band (microwave spectrum) during impedance/dielectric measurement. The impedance spectra were analyzed with lumped-element models. The impedance spectra of the scaffold can be embodied in equivalent circuit models composed of passive components of the circuit, i.e., resistors, inductors and capacitors. It represents the morphological, structural and chemical characteristics of the bone scaffold. The developed models describe the impedance characteristics of plant tissue. In this study, it was found that the ε′ and ε″ of scaffold composites exhibited up and down trends over frequencies for both X-band and Ku-band. The circuit models presented the lowest mean percentage errors of Z′ and Z″, i.e., 3.60% and 13.80%, respectively.

View