M. Noordin - Academia.edu (original) (raw)
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This study attempts to optimize the spinning process used for fabricating hollow fiber membranes ... more This study attempts to optimize the spinning process used for fabricating hollow fiber membranes using the response surface methodology (RSM). The spinning factors considered for the experimental design are the dope extrusion rate (DER), air gap length (AGL), coagulation bath temperature (CBT), bore fluid ratio (BFR), and post-treatment time (PT) whilst the response investigated is rejection. The optimal spinning conditions promising the high rejection performance of polyethersulfone (PES) ultrafiltration hollow fiber membranes for oily wastewater treatment are at the dope extrusion rate of 2.13 cm 3 /min, air gap length of 0 cm, coagulation bath temperature of 30 ˝ C, and bore fluid ratio (NMP/H 2 O) of 0.01/99.99 wt %. This study will ultimately enable the membrane fabricators to produce high-performance membranes that contribute towards the availability of a more sustainable water supply system.
Nickel enables nucleation and growth of well-oriented diamond crystals from the small lattice mis... more Nickel enables nucleation and growth of well-oriented diamond crystals from the small lattice mismatch with diamond.
However, its high solubility for carbon results in carbon loss during diamond deposition and, consequently, results in
poor nucleation density. In this study, Ni/WC-6%Co specimens were carburized in a high-temperature furnace with inert
gas atmosphere in order to provide nickel with sufficient carbon prior to diamond deposition. Two carburizing temperatures
(750 C and 850 C) were set for 20 min and 60 min durations. The effect of this process in altering the nickel
layer composition was characterized by microscopy, element analysis, and phase identification techniques. Scratch test
was performed to evaluate the interface adhesion between the nickel layer and the substrate. The results show that the
carburizing process led to the formation of different metallic phases, such as nickel carbide and cobalt nickel, which
prevented carbon loss during diamond deposition as well as cobalt diffusion into diamond, and thus enhanced diamond
nucleation and growth on the nickel surface.
This study attempts to optimize the spinning process used for fabricating hollow fiber membranes ... more This study attempts to optimize the spinning process used for fabricating hollow fiber membranes using the response surface methodology (RSM). The spinning factors considered for the experimental design are the dope extrusion rate (DER), air gap length (AGL), coagulation bath temperature (CBT), bore fluid ratio (BFR), and post-treatment time (PT) whilst the response investigated is rejection. The optimal spinning conditions promising the high rejection performance of polyethersulfone (PES) ultrafiltration hollow fiber membranes for oily wastewater treatment are at the dope extrusion rate of 2.13 cm 3 /min, air gap length of 0 cm, coagulation bath temperature of 30 ˝ C, and bore fluid ratio (NMP/H 2 O) of 0.01/99.99 wt %. This study will ultimately enable the membrane fabricators to produce high-performance membranes that contribute towards the availability of a more sustainable water supply system.
Nickel enables nucleation and growth of well-oriented diamond crystals from the small lattice mis... more Nickel enables nucleation and growth of well-oriented diamond crystals from the small lattice mismatch with diamond.
However, its high solubility for carbon results in carbon loss during diamond deposition and, consequently, results in
poor nucleation density. In this study, Ni/WC-6%Co specimens were carburized in a high-temperature furnace with inert
gas atmosphere in order to provide nickel with sufficient carbon prior to diamond deposition. Two carburizing temperatures
(750 C and 850 C) were set for 20 min and 60 min durations. The effect of this process in altering the nickel
layer composition was characterized by microscopy, element analysis, and phase identification techniques. Scratch test
was performed to evaluate the interface adhesion between the nickel layer and the substrate. The results show that the
carburizing process led to the formation of different metallic phases, such as nickel carbide and cobalt nickel, which
prevented carbon loss during diamond deposition as well as cobalt diffusion into diamond, and thus enhanced diamond
nucleation and growth on the nickel surface.