Papers by Meor Zainal Meor Talib
Aluminium-air battery is an attractive candidates for metal-air batteries because it has high the... more Aluminium-air battery is an attractive candidates for metal-air batteries because it has high theoretical specific capacity, 2.98 Ahg-1 which is second highest after Li (3.86 Ahg-1) and higher than other active metals; Mg (2.20 Ahg-1) and Zn (0.82 Ahg-1). One of the important components inside aluminium-air battery is electrolyte. Electrolyte is the conducting medium through which the two-way charges transfer occurs between the electrodes. The electrolyte also separates the anode and cathode to avoid short circuit and simultaneously provides OH- to maintain the electrochemical reactions. Aqueous electrolytes are widely used in aluminium-air batteries because of their high ionic conductivities. This paper shows the development of the aqueous electrolytes selection based on their pH ranges which are acidic solution, neutral salt solution and alkaline solution. Since alkaline solution is frequently used in aluminium-air battery, this paper also discusses the problems that encountered d...
International Journal on Advanced Science, Engineering and Information Technology, 2014
The drying of crushed oil palm fronds was studied in a fluidized bed dryer assisted with mechanic... more The drying of crushed oil palm fronds was studied in a fluidized bed dryer assisted with mechanical agitation at different inlet air temperature, superficial air velocity, bed loading and agitation speed. The drying kinetics of the fibers under various drying conditions could be described by a single characteristic drying curve. A combined exponential and power law model is proposed to represent the characteristic drying curve which described both the increasing rate and the falling rate periods. The proposed model is also tested for drying kinetics of oil palm empty fruit bunch from previous researcher. It was found that the characteristic curve for both oil palm fronds and empty fruit bunch fibers has similar shape and that the proposed model is acceptable for describing the complete drying characteristics of the fibers.
Transactions of the ASAE, 1995
Applied Mechanics and Materials, 2015
This study presents comparisons between the morphologies and photoluminescence properties of tin ... more This study presents comparisons between the morphologies and photoluminescence properties of tin oxide (SnO2) nanoparticles prepared by two methods, namely the sol gel and the co-precipitation methods. The characteristics of the particles were analyzed using X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The particles prepared using the sol-gel method have a finer particle size and more spherical shape. However, no significant difference was observed in terms of morphology and homogeneity in the samples produced by either the co-precipitation or sol-gel methods. In contrast, the photoluminescence study shows that the emission peak for powder prepared using the sol-gel method was higher than that of the co-precipitation method.
The Proceedings of the 5th Asia-Pacific Drying Conference, 2007
Advanced Materials Research, 2014
Co/Pd bi metallic catalyst supported on MgO has been prepared by sol gel method, at different cal... more Co/Pd bi metallic catalyst supported on MgO has been prepared by sol gel method, at different calcination temperatures of 250 and 550 C. They were introduced in to the reactor for 5 hrs of reaction. The CNTs were collected. The obtained CNTs were characterized by XRD and SEM and the yield was observed. It has been concluded that the catalyst calcined at higher temperature will lead to higher yield and more uniform and smaller diameter CNTs.
Proceedings of the 5th Asian Particle Technology Symposium, 2012
Journal of Applied Sciences, 2014
Separation & Purification Reviews, 2013
ABSTRACT Membrane fouling has been recognized as an inevitable problem impairing all membrane pro... more ABSTRACT Membrane fouling has been recognized as an inevitable problem impairing all membrane processes. Fouling control strategies have been adopted to resolve membrane fouling. Fouling index is one of the most popular fouling prediction tools used to predict the fouling potential of feed water in membrane filtration systems. This paper provides an overview of the past and present developments of fouling indices measurement techniques as the membrane fouling prediction tool in reverse osmosis/nanofiltration process. This paper also addresses the possible fouling mechanisms and type of fouling in water filtration processes, start-of-art techniques used to assess fouling mechanisms and methods to predict fouling. The fouling prediction methods highlighted are silt density index (SDI) and modified fouling index (MFI). These fouling indices are correlated with their applications in evaluating the pretreatment efficiency and the flux decline predictions of a feed. Even though there are a number of researchers focusing on the measurement of MFI, the MFI obtained was not correlated to the quality of feed empirically. An appropriate index should be capable of being used as an input to mathematical models for predicting the degree of fouling in a discrete form. The future direction and potential use of fouling indices are also discussed.
Powder Technology, 2010
A gap in knowledge exists in modeling particle-wall collision of amorphous food particles in spra... more A gap in knowledge exists in modeling particle-wall collision of amorphous food particles in spray drying. Most work uses a stick-upon-contact or glass transition criterion which tends to over-predict the deposition. This communication introduces a new idea in relating viscoelastic rheological characteristics to modeling of amorphous food particle-wall collisions. A time-temperature superposition technique was employed. This approach allows the effect of impacting velocity and particle size as well as the effect of particle rigidity to be incorporated in determining the impaction outcome. Trends obtained from the case study undertaken showed good qualitative agreement with past reports. Suggestions are included on possible extension to model particle-particle collisions.
Particuology, 2008
Deposition of amorphous particles, as a prevalent problem particularly in the spray drying of fru... more Deposition of amorphous particles, as a prevalent problem particularly in the spray drying of fruit and vegetable juices, is due to low-molecularweight sugars and is strongly dependent on the condition of the particles upon collision with the dryer wall. This paper investigates the condition of the amorphous particles impacting the wall at different drying conditions with the aim of elucidating the deposition mechanism and physical phenomena in the drying chamber. A model sucrose-maltodextrin solution was used to represent the low-molecular-weight sugar. Particle deposits were collected on sampling plates placed inside the dryer for analyses of moisture content, particle rigidity (using SEM) and size distribution. Moisture content was adopted as a general indicator of stickiness. Product particles collected at the bottom of the experimental dryer were found to have higher moisture than particle deposits on samplers inside the dryer. Moisture content profile in the dryer shows that apart from the atomizer region, where particles are relatively wet, particle deposits at other regions exhibit similar lower moisture content. At the highest temperature adopted in the experiments, particles became rubbery suggesting liquid-bridge formation as the dominant deposition mechanism. Further analysis on particles size distribution reveals a particle segregation mechanism whereby smaller particles follow preferentially to the central air stream while larger particles tend to re-circulate in the chamber, as predicted in past CFD simulation. The findings from this work will form the basis and provide validating data for further modeling of wall deposition of amorphous particles in spray drying using CFD.
Journal of Membrane Science, 2013
This paper deals with setting-up of modified fouling index (MFI) and crossflow sampler-modified f... more This paper deals with setting-up of modified fouling index (MFI) and crossflow sampler-modified fouling index (CFS-MFI) devices for prediction of fouling potential in a reverse osmosis (RO)/ nanofiltration (NF) filtration system. The setting-up procedures of the laboratory-scale MFI and CFS-MFI devices operated in constant flux were described in detail. A practical approach to test the functionality of devices was also suggested. The devices are instrumented for monitoring transmembrane pressure, crossflow velocity, and flux at a desired time interval. A series of MFI const.flux and CFS-MFI const.flux tests were carried out using various types of membranes and foulants to determine the functionality and consistency of the newly developed system. The results showed that the differences between MFI const.flux and CFS-MFI const.flux values were more significant for high polydispersed foulants (e.g., 70-100 nm colloidal silica and Aldrich humic acid) than monodispersed foulants (e.g., 22 nm particle colloidal silica). When using the polydispersed foulants, the CFS-MFI const.flux showed a better agreement with actual RO fouling trend than the MFI const.flux. These observations proved that with the presence of CFS cell, the CFS-MFI const.flux is capable of simulating a more realistic RO fouling behaviour than the MFI const.flux value (without the consideration of crossflow effect). The successful setting-up of the fouling prediction devices in this study would provide a useful guide for future researchers on the fouling potential of membrane.
Journal of Food Engineering, 2013
Journal of Food Engineering, 2009
A recent recommendation to control deposition in spray drying is to manipulate the wall surface e... more A recent recommendation to control deposition in spray drying is to manipulate the wall surface energy in order to reduce the formation of particle-wall liquid bridges. It was recently demonstrated that this is applicable for ‘rubbery’ particle-wall contacts at relatively low wall temperatures. In this work, experimental investigation was carried out at quasi-steady and relatively elevated wall temperatures to better
International Journal of Food Science and Technology, 2005
The main objective of the study was to determine the kinetics of the polyphenol oxidation reactio... more The main objective of the study was to determine the kinetics of the polyphenol oxidation reaction in cocoa beans during air drying at various air temperatures and humidities. The temperatures used were between 40 and 60°C and the relative humidities were between 50 and 80%. The higher the temperature and relative humidity of the drying air, the lower the amount of polyphenol residue in the cocoa beans, because of enzymatic oxidation of polyphenols. At higher drying temperatures, non-enzymatic oxidation of polyphenols could also occur. Computer simulation results gave rate constants for the polyphenol oxidation reaction (k 1) and the condensation reaction (k 2), at various air conditions, in the range of 0.055-0.200 and 0.136-0.155 h)1 respectively. The activation energies obtained for the polyphenol oxidation reaction were in the range of 27 800-30 312 J K)1 mol)1. The reaction kinetics of the enzymatic browning reaction fitted a pseudo first-order reaction.
Drying Technology, 1997
The drying characteristics of a single oil palm kernel suspended in a drying tunnel is studied. L... more The drying characteristics of a single oil palm kernel suspended in a drying tunnel is studied. Luikov's unsteady state simultaneous heat and mass transpon equations are proposed as the governing equations. The model is simulated using the explicit and modified implicit Crank Nicholson finite difference algorithms. The desorption isotherms of the kernel warj determined using an environmental chamber and the
Drying Technology, 2007
... Meng Wai Woo, Wan Ramli Wan Daud, Siti Masrinda Tasirin, and Meor Zainal Meor Talib Deparment... more ... Meng Wai Woo, Wan Ramli Wan Daud, Siti Masrinda Tasirin, and Meor Zainal Meor Talib Deparment of Chemical & Processing Engineering, Universiti Kebangsaan Malaysia, 43600 Bangi ... The rig is held in place by pushing against the dryer wall using the stud rod and bolts. ...
Drying Technology, 2007
Desirable flavor qualities of cocoa are dependent on how the cocoa beans are fermented, dried, an... more Desirable flavor qualities of cocoa are dependent on how the cocoa beans are fermented, dried, and roasted. During fermentation and drying, polyphenols such as leucocyanidin and apecatechin are oxidized by polyphenols oxidase to form o-quinone, which later react ...
Drying Technology, 2012
... a , A. Luqman Chuah c & AR Russly d pages 386-397. ... A key processing problem in spray ... more ... a , A. Luqman Chuah c & AR Russly d pages 386-397. ... A key processing problem in spray dryers is wall deposition of particles, which indirectly affects the quality of the product through degradation of the deposited particles and the resulting contamination of the main product. ...
Drying Technology, 1996
The characteristic drying curves of cocoa beans are determined by using a tunnel drier where cond... more The characteristic drying curves of cocoa beans are determined by using a tunnel drier where conditioned air passes a single cocoa berm suspended from an electronic balance in the test section. Weight loss, and temperatures of air, testa and nib of the cocoa bean is monitored on personal computers. The nornmalised drying rate versus the normalised moisture content is regressed
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Papers by Meor Zainal Meor Talib