Papers by Fadilah Mohamed
Chemical engineering transactions, 2015
Poly(lactic acid) PLA that derived from renewable resources can help our society to reduce the de... more Poly(lactic acid) PLA that derived from renewable resources can help our society to reduce the dependence to non-renewable fossil resources. When come to human contact, this polymer and its degradation product are neither toxic nor carcinogenic to human body. The use of poly(lactic acid) (PLA), a biodegradable polymer, as a membrane material would assist the reduction of depending to petroleum-based polymer that will assist in disposal issues on non-biodegradable polymer. This study investigated the effect of evaporation time to the gas separation performance of PLA membrane. Membrane prepared from polymer solution consists of PLA and dichloromethane (DCM) as solvent was fabricated using pneumatically controlled casting system with dry/wet phase inversion method. Permeation test was conducted using pure oxygen and nitrogen gas. The results revealed that as the evaporation time increased, the pore size and surface porosity decreased, while the skin layer thickness increased. Although...
ICGSCE 2014, 2015
Membrane gas separation has been one of the most favorable techniques used in industry due to its... more Membrane gas separation has been one of the most favorable techniques used in industry due to its efficiency and low operating cost. One of the main problems in using membrane in gas separation is the non-biodegradable nature of the membrane material. In this study, PLA membrane was fabricated for oxygen/nitrogen separation system. The dope solution was prepared by using dichloromethane as a solvent with different concentration of 15, 17.5, 20 and 25 wt%. The membrane was cast at a fixed casting speed and solvent evaporation time of 0.0413 ms−1 and 60 s, respectively by using pneumatically-controlled casting system via dry/wet phase inversion technique. The prepared membrane morphology, mechanical strength and gas permeation performance was characterized using scanning electron microscope (SEM), tensile testing machine and soap bubble meter, respectively. Based on SEM result, the increase in dope solution concentration was proven to decrease the membrane porosity and increase its compactness that leads to the improvement of membrane gas permeation performance and mechanical strength. However, the further increase of concentration led to membrane brittleness with low elasticity causing the membrane become hard to handle for further testing.
Applied Mechanics and Materials, 2014
Ceramic materials have been widely utilized due to its attractive properties including high resis... more Ceramic materials have been widely utilized due to its attractive properties including high resistance to extremely harsh environments; chemical and heat, and its durability to the remarkable mechanical strength. Inorganic flat sheet films in this study were prepared by dry-wet phase inversion process followed by sintering method, which expected to produce very unique micro-structures leading to improvement in performance for various applications including catalytic reactions and filtration processes. Aluminium oxide was chosen as the main material due its known capability in filtration processes, membrane reactors and membrane catalysis applications. Polyethersulfone (PES) was used as an organic binder in the membrane dope formulation. Besides alumina and PES, the dope solution was consisted of N-methyl-2-pyrrolidone (NMP) and arlacel as solvent and additive, respectively. The main aim of this study is to investigate the effect of sintering temperature on the morphology and structu...
The use of biodegradable material in membrane technology will be a great solution in reducing unb... more The use of biodegradable material in membrane technology will be a great solution in reducing unbiodegradable waste in the landfill. The main objective of this preliminary study is to investigate the morphology and mechanical properties of poly(lactic acid) (PLA) flat sheet membrane as the solvent evaporation time was varied and its potential for gas separation process. Dichloromethane was used as a solvent for preparing 15wt% PLA membrane dope solution. The membranes were produced by a simple dry/wet phase inversion technique using a pneumatically controlled casting system with various solvent evaporation times between 10 to 90 s to promote the formation of the desired structure prior to immersion into a water coagulation bath. Prior to the gas permeation test, the prepared membrane were coated with silicone rubber coating to reduce the membrane surface defect and improved the gas separation performance. The membrane surface morphology was examined using scanning electron microscopy (SEM). This preliminary study revealed that the produced membrane possessed an asymmetric structure with a very thin dense layer, a porous substructure and the porosity of the skin surface was reduced as the evaporation time increased. This showed that the membrane had a better molecular rearrangement and this was further supported by the slight improvement of the membrane mechanical strength. Pressure-normalized fluxes of oxygen and nitrogen and the separation factor of O2/N2 measured showed that PLA asymmetric membrane has a potential as a membrane material for gas separation. Further improvement is required in term of morphology with defect-free layer to ensure the PLA membrane can perform at its best in a gas separation proce
Cellulose acetate (CA) polymeric membrane has been used as gas separator; however, the modest sel... more Cellulose acetate (CA) polymeric membrane has been used as gas separator; however, the modest selectivity and trade-off between permeability and selectivity have reduced the utilization of this polymer. Thus, the objectives of this study were to investigate the effect of polymer concentration and formic acid (FA) crosslinking agent loading on the formation of the membrane morphology and gas separation performance. The CA in tetrahydrofuran (THF) flat sheet asymmetric membrane was fabricated by dry/wet phase inversion process with two conditions of dope solution formulation: (1) varying the polymer concentration ranging from 13 to 16 wt.% and (2) manipulating FA:THF ratio between 0:100 to 10:90. The prepared membrane was analyzed by using viscometer, field emission scanning electron microscopy, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis, and tensile testing machine. The membrane gas permeation performance was tested using pure gases of hydrogen (H2), o...
Advanced Materials Research, 2015
Membrane technology in gas separation application was commercialized approximately 30 years ago b... more Membrane technology in gas separation application was commercialized approximately 30 years ago because of a number of advantages offered compare to the conventional technique. The use of poly (lactic acid) (PLA), a biodegradable polymer, as a membrane material would assist the reduction of depending to petroleum-based polymer. This study investigated the effect of evaporation time to the gas separation performance of PLA membrane. Membrane prepared from polymer solution consist of PLA and dicholoremethane (DCM) as solvent was fabricated using pneumatically controlled casting system with dry/wet phase inversion method. Permeation test was conducted using pure carbon dioxide and methane gas. The results revealed that as the evaporation time increased, the pore size and surface porosity decreased, while the skin layer thickness increased. Although the morphology of the prepared membranes showed the desirable structure, the gas separation performance of the membrane prepared with polym...
Membrane technology in gas separation application was commercialized approximately 30 years ago b... more Membrane technology in gas separation application was commercialized approximately 30 years ago because of a number of advantages offered compare to the conventional technique. The use of poly (lactic acid) (PLA), a biodegradable polymer, as a membrane material would assist the reduction of depending to petroleum-based polymer. This study investigated the effect of evaporation time to the gas separation performance of PLA membrane. Membrane prepared from polymer solution consist of PLA and dicholoremethane (DCM) as solvent was fabricated using pneumatically controlled casting system with dry/wet phase inversion method. Permeation test was conducted using pure carbon dioxide and methane gas. The results revealed that as the evaporation time increased, the pore size and surface porosity decreased, while the skin layer thickness increased. Although the morphology of the prepared membranes showed the desirable structure, the gas separation performance of the membrane prepared with polymer concentration of 15wt% and 60s evaporation time was found to be promising but not yet commercially ready.
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Papers by Fadilah Mohamed