Nashrul Fazli Mohd Nasir
Thumbnail Image
Preferred name
Nashrul Fazli Mohd Nasir
Official Name
Nashrul Fazli Mohd, Nasir
Alternative Name
Mohd Nasir, Nashrul Fazli
Nasir, Nashrul Fazli Bin Mohd
Mohamad Nasir, N. F.
Nasir, N. F.M.
Nashrul Fazli, M. N.
Mohd. Nasir, N. F.
Main Affiliation
Scopus Author ID
36625951700
Researcher ID
I-7607-2015

Research Output

No data found
Now showing 1 - 6 of 6
Thumbnail Image
Publication

Regression analysis of the dielectric and morphological properties for porous Nanohydroxyapatite/Starch composites: a correlative study

2022 , Chong You Beh , Cheng Ee Meng , Nashrul Fazli Mohd Nasir , Mohd Shukry Abdul Majid , Khor Shing Fhan , Mohd Ridzuan Mohd Jamir , Emma Ziezie Mohd Tarmizi , Kim Yee Lee

This paper aims to investigate the dielectric properties, i.e., dielectric constant (ε′), dielectric loss factor (ε″), dielectric tangent loss (tan δ), electrical conductivity (σ), and penetration depth (Dp), of the porous nanohydroxyapatite/starch composites in the function of starch proportion, pore size, and porosity over a broad band frequency range of 5 MHz–12 GHz. The porous nanohydroxyapatite/starch composites were fabricated using different starch proportions ranging from 30 to 90 wt%. The results reveal that the dielectric properties and the microstructural features of the porous nanohydroxyapatite/starch composites can be enhanced by the increment in the starch proportion. Nevertheless, the composite with 80 wt% of starch proportion exhibit low dielectric properties (ε′, ε″, tan δ, and σ) and a high penetration depth because of its highly interconnected porous microstructures. The dielectric properties of the porous nanohydroxyapatite/starch composites are highly dependent on starch proportion, average pore size, and porosity. The regression models are developed to express the dielectric properties of the porous nanohydroxyapatite/starch composites (R2 > 0.96) in the function of starch proportion, pore size, and porosity from 1 to 11 GHz. This dielectric study can facilitate the assessment of bone scaffold design in bone tissue engineering applications.

View
Thumbnail Image
Publication

Dielectric and biodegradation properties of biodegradable nano-hydroxyapatite/starch bone scaffold

2022 , Beh Chong You , Cheng Ee Meng , Nashrul Fazli Mohd Nasir , Emma Ziezie Mohd Tarmizi , Khor Shing Fhan , Eng Swee Kheng , Mohd Shukry Abdul Majid , Mohd Ridzuan Mohd Jamir

This study is aim to investigate the dielectric properties (dielectric constant, ε′ and loss factor, ε′′) and the biodegradation properties of the nano-hydroxyapatite/starch bone scaffold with various starch proportion in simulated body fluid. The nano-hydroxyapatite/starch bone scaffolds with starch proportions 30, 40, 50, 60, 70, 80, and 90 wt.% were fabricated. The ε′ and ε′′ of nano-hydroxyapatite/starch composite decrease when frequency increases. However, it increases when starch proportion and temperature increase. The biodegradation properties of the nano-hydroxyapatite/starch bone scaffold can be improved when the dielectric properties and porosity are enhanced. The enhancement of dielectric properties and porosity is due to the increment of starch proportion. The nano-hydroxyapatite/starch bone scaffold with the high starch proportion exhibits nano-hydroxyapatite/starch interfaces with strong intermolecular interactions that can stabilize biodegradation and biomineralization. The dielectric properties of the simulated body solutions are highly sensitive to the variation of the ion concentrations (calcium and phosphate). The nano-hydroxyapatite/starch bone scaffold with 80 wt.% starch proportion exhibits significant dielectric and biodegradation properties. It has potential to be a biodegradable inorganic/organic bone scaffold.

View
Thumbnail Image
Publication

The mechanical characterization of dioscorea alata and plectranthus rotundifolius starch-HA composite

2018-11 , N. A. F. Mohd Hori , Nashrul Fazli Mohd Nasir , Nasrul Amri Mohd Amin , Cheng Ee Meng , Mohd Shukry Abdul Majid , S. A. Rahman

The scaffolds made of starch-hydroxyapatite (HA) were fabricated by using solvent casting method and particulate leaching technique. The starches originated from Malaysian tubers which were Dioscorea alata (purple yam) and Plectranthus rotundifolius (Chinese potato). A composite were prepared by adding different weight of HA and of starch powder together with 20 ml of distilled water. The 50%, 60%, and 70% concentrations of starch-HA were prepared in this study. After the fabrication process, the effect of the starch-HA composites were investigated. The microstructures and the morphology of the composite scaffold were observed using SEM and the mechanical properties (Young’s modulus) of the scaffold is obtained by performing compressive test on the scaffolds. The results shows that the mechanical strength of Plectranthus rotundifolius is stronger compared to Dioscorea alata with the Young’s modulus of (70% starch in the composite) is 15.55 MPa for Dioscorea alata and 18.81 MPa for Plectranthus rotundifolius.

View
Thumbnail Image
Publication

Complex impedance and modulus analysis on porous and non-porous scaffold composites due to effect of Hydroxyapatite/starch proportion

2023 , Chong You Beh , Cheng Ee Meng , Xiao Jian Tan , Nashrul Fazli Mohd Nasir , Mohd Shukry Abdul Majid , Mohd Ridzuan Mohd Jamir , Khor Shing Fhan , Kim Yee Lee , 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

Regression analysis of the dielectric and morphological properties for Porous Nanohydroxyapatite/Starch composites: a correlative study

2022 , Chong You Beh , Cheng Ee Meng , Nashrul Fazli Mohd Nasir , Mohd Shukry Abdul Majid , Khor Shing Fhan , Mohd Ridzuan Mohd Jamir , Emma Ziezie Mohd Tarmizi , Kim Yee Lee

This paper aims to investigate the dielectric properties, i.e., dielectric constant (ε′), dielectric loss factor (ε″), dielectric tangent loss (tan δ), electrical conductivity (σ), and penetration depth (Dp), of the porous nanohydroxyapatite/starch composites in the function of starch proportion, pore size, and porosity over a broad band frequency range of 5 MHz–12 GHz. The porous nanohydroxyapatite/starch composites were fabricated using different starch proportions ranging from 30 to 90 wt%. The results reveal that the dielectric properties and the microstructural features of the porous nanohydroxyapatite/starch composites can be enhanced by the increment in the starch proportion. Nevertheless, the composite with 80 wt% of starch proportion exhibit low dielectric properties (ε′, ε″, tan δ, and σ) and a high penetration depth because of its highly interconnected porous microstructures. The dielectric properties of the porous nanohydroxyapatite/starch composites are highly dependent on starch proportion, average pore size, and porosity. The regression models are developed to express the dielectric properties of the porous nanohydroxyapatite/starch composites (R2 > 0.96) in the function of starch proportion, pore size, and porosity from 1 to 11 GHz. This dielectric study can facilitate the assessment of bone scaffold design in bone tissue engineering applications.

View
Thumbnail Image
Publication

Fabrication and characterization of three-dimensional porous cornstarch/n-HAp biocomposite scaffold

2020-12-01 , Beh C.Y. , Cheng Ee Meng , Nashrul Fazli Mohd Nasir , Mohd Shukry Abdul Majid , Mohd Roslan M.R. , You K.Y. , Khor Shing Fhan , Mohd Ridzuan Mohd Jamir

The aim of this study is to investigate the morphological, functional group, crystallinity and mechanical properties of a three-dimensional porous cornstarch/n-HAp (nano-hydroxyapatite) biocomposite scaffold. In this study, cornstarch/n-HAp scaffolds were fabricated using the solvent casting and particulate leaching technique. The porous cornstarch/n-HAp composites with various cornstarch contents (30, 40, 50, 60, 70, 80 and 90 wt%) were prepared and characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffractometer and compression test. The morphology of the scaffolds possessed macropores (200–600 Î¼m) and micropores (50–100 Î¼m) with a high interconnectivity. The porosity of the porous cornstarch/n-HAp scaffolds varied between 53 and 70% with compressive strength and compressive modulus of 2.03 and 8.27 MPa, respectively. The results suggested that highly porous cornstarch/n-HAp scaffold properties with adequate mechanical properties can be obtained for applications in bone tissue engineering.

View