Cheng Ee Meng
Thumbnail Image
Preferred name
Cheng Ee Meng
Official Name
Cheng, Ee Meng
Alternative Name
Cheng, E. M.
Cheng, Ee M.
Cheng, Ee Meng
Main Affiliation
Scopus Author ID
57219023469
Researcher ID
IOQ-9149-2023

Research Output

Filters

65
Reset filters

Settings
Now showing 1 - 10 of 65
  • Publication
    Physical, thermal, and mechanical properties of highly porous polylactic acid/cellulose nanofibre scaffolds prepared by salt leaching technique
    ( 2021)
    Revati Radakisnin
    ;
    Mohd Shukry Abdul Majid
    ;
    Mohd Ridzuan Mohd Jamir
    ;
    Mohd Faizal Mat Tahir
    ;
    Cheng Ee Meng
    ;
    Hassan Al Alshahrani
    This study aimed to prepare and characterise polylactic acid (PLA) reinforced with cellulose nanofibre (CNF) from a Pennisetum purpureum-based composite scaffold and determine its structural and mechanical properties. Porous scaffolds with CNF compositions of 5‒20 wt% in the PLA matrix were developed using solvent casting and particulate leaching of its porogen at 90 wt% of loadings. Morphology studies using field emission scanning electron microscopy revealed that the scaffolds had well-interconnected pores with an average pore size range of 67‒137 µm and porosity >76%. X-ray diffraction confirmed the interconnectivity and homogeneity of the pores and the fibrous structure of the scaffolds. The compressive strength of the fabricated scaffolds varied between 2.34 and 6.66 MPa, while their compressive modulus was between 1.95 and 6.04 MPa for various CNF contents. Furthermore, water absorption and thermal degradation studies showed that the scaffold had good hydrophilicity and improved thermal stability. These findings highlight the need to modify the pore structure and mechanical performance simultaneously for tissue engineering. Thus, this study concludes that the developed PLA scaffolds reinforced with CNF from Pennisetum purpureum are potential candidates for cell attachment and extracellular matrix generation.
  • Publication
    Fourier transform infrared spectroscopy of graphene nanoplatelets-glass and multi-walled carbon nanotubes-glass reinforced epoxy composite
    ( 2024-03-07)
    Ahmad M.A.A.
    ;
    Mohd Ridzuan Mohd Jamir
    ;
    Mohd Shukry Abdul Majid
    ;
    Cheng Ee Meng
    ;
    Mohd Shihabudin Ismail
    This study investigates the effect of nanofiller loading of graphene nanoplatelets and multi-walled carbon nanotubes on the characterisation of glass reinforced epoxy composite. The GNP-glass and MWCNT-glass composites were prepared using the hand lay-up and vacuum bagging method. The nanofiller weight fraction at 0.5, 1.5, 3, and 5 wt. % was being analysed. FTIR spectra were used to evaluate the GNP and MWCNT nanofiller's contribution to different crystalline formations in the epoxy matrix. The result indicates a variation peak in GNP-glass and MWCNT-glass reinforced epoxy composites due to nanofiller incorporation. The stretching vibration peak in the transmittance percentage was related to the better bond formation of the nanofiller with the epoxy matrix.
  • Publication
    The Effect of the Amylose/Amylopectin Contents of Starch on Porosity and Dielectric Properties of the Porous Hydroxyapatite/Starch Composites
    ( 2020-07-09)
    Chong You B.
    ;
    Cheng Ee Meng
    ;
    Abu Bakar S.
    ;
    Nashrul Fazli Mohd Nasir
    ;
    Eng Swee Kheng
    ;
    Mohd Shukry Abdul Majid
    ;
    Mohd Ridzuan Mohd Jamir
    ;
    Khor Shing Fhan
    This study aims to determine the effect of the amylose/amylopectin contents of starch on the porosity and dielectric properties of porous hydroxyapatite/starch composites. The porous hydroxyapatite/starch composites were prepared by utilizing the starches (rice, corn and potato starch) via gelatinization and retrogradation process. The complex permittivity of the porous hydroxyapatite/starch composites were evaluated in the frequency range of 12.4-18.0 GHz. The porous composites were exhibited the higher average porosity by using the starch with higher amylopectin content. The highly porous hydroxyapatite/starch composites with higher amylopectin content show the significant fluctuation peaks (at 13.8 and 16.6 GHz) and the higher imaginary part of the complex permittivity (ϵ′′) at higher frequency in the dielectric spectrum, respectively. The real (ϵ′) and imaginary part (ϵ′′) of the complex permittivity of the porous composites could be enhanced by increasing the average porosity and the amylopectin contents.
  • Publication
    Preliminary study of the polymesoda expansa based hydroxyapatite for medical devices coating application
    ( 2020-12-15)
    Roslan M.R.
    ;
    Nashrul Fazli Mohd Nasir
    ;
    Gilani M.A.
    ;
    Nur Farahiyah Mohammad
    ;
    Cheng Ee Meng
    ;
    Khalid M.F.A.
    ;
    Zoolfakar A.S.
    ;
    Nasrul Amri Mohd Amin
    ;
    Shah Fenner Khan Mohamad Khan
    Hydroxyapatite (HA) which is a group of calcium phosphate (CaP) is used as a medical devices coating due to its ability to increase the bioactivity and biocompatibility of the device surface. The attraction of using waste seashells products is interesting due to its sustainability and low cost solution especially in biomedical application. Polymesoda expansa or locally known as Lokan is potentially rich with calcium carbonate (CaCO3). Here, the synthesis of HA was done via precipitation method by utilizing the Polymesoda expansa (Lokan) shells as the resource of calcium precursors. Hydroxyapatite synthesized from Polymesoda expansa was carried out with different pH solution (pH 9 and 13) in alkaline environment. The effects of pH on the morphological and chemical composition properties as well as the Ca/P ratio of HA powders were analyzed through Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), and Energy Dispersive X-ray Spectrometry (EDS). The finding demonstrates as the pH increases, the calcium apatite reduced and this had increases the Ca/P ratio.
  • Publication
    Study of eddy current density distribution in a contactless breast cancer detection mechanism using magnetic induction spectroscopy
    ( 2017-01-01)
    Gowry Balasena
    ;
    Shahriman Abu Bakar
    ;
    Zulkarnay Zakaria
    ;
    Ryojun Ikeura
    ;
    Zuradzman Mohamad Razlan
    ;
    Hazry Desa
    ;
    Wan Khairunizam Wan Ahmad
    ;
    Cheng Ee Meng
    ;
    Mohd Afendi Rojan
    Breast cancer is a throbbing disease that no longer needs an introduction. This is especially true among women due to their unique breast structure that naturally has more breast tissues compared to that of man’s. It is been forecasted that in 2015, a minimum of 60290 new cases of breast cancer will be reported. The goal of this study is to analytically evaluate the changes in the induced Eddy current densities as a function of di-electrical properties of the breast tissue with respect to tumor positioning as well as its size. This is achieved by running numerical simulations on the proposed mechanism of magnetic induction to detect tumors among healthy breast tissue via a 2D breast model configuration. The analytical results presented in this article, proved that the multi frequency magnetic induction principle is viable in detecting the breast lesions as small as 0.2 cm non-invasively through the distributions of the induced Eddy current density. While important pattern of the induced current were reflected when the tumors are located at the far ends of the breast diameter. The minimum results computational time with the proposed system is 10 s.
  • Publication
    Phase Analysis of Bio-Based Derived Tricalcium Disilicate From 2CaO:1SiO2 By X-ray Diffraction
    ( 2021-12-14)
    Siti Nur Hazwani Yunus
    ;
    Fhan K.S.
    ;
    Banjuraizah Johar
    ;
    Nur Maizatul Shima Adzali
    ;
    Jakfar N.H.
    ;
    Cheng Ee Meng
    In this paper, tricalcium disilicate was formed from dicalcium silicate compound powder, synthesised via a mechanochemical technique using a stoichiometric 2CaO:1SiO2. Compound CaO and SiO2 were derived from the bio-waste of eggshell and rice husk at the calcination temperature of 900oC and 800oC, respectively. The dicalcium disilicate powder was sintered for 2 hours at different temperatures ranging from 1150oC to 1350oC. Using X-ray diffraction with Rietveld analysis, it was found that the amount of tricalcium disilicate with monoclinic (beta) crystal structure increases on sintering temperature at the expense of dicalcium silicate. The complete formation of single-phase tricalcium disilicate began at a sintering temperature of 1300oC. The effect of sintering temperatures on the crystallisation and phase transition of dicalcium silicate is reported. The size of crystallites depends on the sintering temperature. The finding of this study rebound to the benefit of society by reducing the risk-off pollution cause by accessive redundant bio-waste eggshell and rice husk and also reduced the amount of CaO and SiO2 used in the fabrication of Ca3Si2O7
  • Publication
    Comparative Study between Wearable Sensor and Cuff Arm Blood Pressure Meter in Measuring Blood Pressure and Heart Rate Monitor Using Statistical Approach
    ( 2020-06-17)
    Cheng Ee Meng
    ;
    Lim E.A.
    ;
    Tan W.H.
    ;
    Mustafa W.A.
    ;
    Syed Zulkarnain Syed Idrus
    ;
    Nashrul Fazli Mohd Nasir
    ;
    Abdulmalek M.
    ;
    Beh H.G.
    ;
    Lee Y.S.
    ;
    Mou Yusop S.N.A.
    Heart rate and blood pressure monitoring during physical activity and exercise allow early diagnosis of cardiovascular disease (CVD) and obesity. Plethysmography(PPG) has become popular worldwide for personal health monitoring systems. However, the accuracy of this technology in monitoring heart rate and blood pressure during activity is poorer than at rest. It limits their application. In this study, the performance of the wearable sensor and arm cuff blood pressure meter in measuring heart rate and blood pressure on the left arm is compared. Five healthy volunteers conducted the same exercise protocols, i.e., at rest, jump rope, treadmill walking, running (long run) and sprinting (short-run). The wearable sensor shows a mean absolute percentage error in 6.08% and Pearson coefficient in 0.61. Besides, the lowest range of 95% limit of agreement for diastolic blood pressure during treadmill run was found at 30.50.
  • Publication
    A comparative study on chitosan/gelatin composite films with incorporated pith and cortex of napier grass
    ( 2021-10-25)
    Rohadi T.N.T.
    ;
    Mohd Ridzuan Mohd Jamir
    ;
    Mohd Shukry Abdul Majid
    ;
    Cheng Ee Meng
    ;
    Norasni M.J.
    ;
    Marsi N.
    The problem in end-of-life of petroleum-based plastic management had risks wildlife and human health with rapid used in fossil reserves. Therefore, the exploration of biodegradable plastics that embraced a new eco-friendly alternative to overcome these limitations have been conducted. In this paper, the chitosan and gelatine composite film with incorporated pith and cortex of Napier grass were prepared via solution casting will be evaluated. The thermal, chemical, mechanical properties and morphological characterization of composite film had been conducted via thermo-gravimetric analysis, Fourier transforms infrared spectroscopy, tensile strength, and scanning electron microscope. The results shows that the cortex had potential to be used as reinforcement material same as the pith to broaden the use of Napier grass in industrial. Thus, further studied with additional of cellulose from pith and cortex of Napier grass in the chitosan/gelatin composite films may improve the tensile strength due to the removal of non-cellulosic component.
  • 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.
  • Publication
    Biodegradation of PLA-Pennisetum purpureum based biocomposite scaffold
    ( 2017-10-29)
    Revati R.
    ;
    Mohd Shukry Abdul Majid
    ;
    Mohd Ridzuan Mohd Jamir
    ;
    Normahira Mamat @ Mohamad Nor
    ;
    Nashrul Fazli Mohd Nasir
    ;
    Cheng Ee Meng
    The in vitro degradation and mechanical properties of a 3D porous Pennisetum purpureum (PP)/polylactic acid (PLA) - based scaffold was investigated. In this study, composite scaffolds with PP to PLA ratio of 0%, 10%, 20%, and 30% were immersed in PBS solution at 37 °C for 40 days. Interestingly, the degradation rate was reduced for the PLA/PP20 scaffold, though insignificantly, this could be attributed to the improved mechanical properties and stronger fibre-matrix interface. The FESEM results indicated that a sound fibre-matrix interface was formed in the PLA/PP20 scaffold, which reflected the addition of P. purpureum into PLA decreasing the degradation rate compared to in pure PLA scaffolds. The results suggest that the P. purpureum/PLA scaffold degradation rate can be altered and controlled to meet the requirement imposed by a given tissue engineering application.