The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
A. F. Ismail - One of the best experts on this subject based on the ideXlab platform.
-
Study on the effect of Polymer Concentration on hollow fiber ultrafiltration membrane performance and morphology
2020Co-Authors: M. I. Mustaffar, A. F. Ismail, Rosli Md. IlliasAbstract:The effects of Polymer Concentration on separation performance and morphology of polyethersulfone hollow fiber (HF) ultrafiltration membrane has been investigated. The hollow fiber ultrafiltration membranes were produced by using a dry/wet spinning process with forced convection in the dry air gap. Three new Polymer solutions were developed by using turbidimetric titration method. The formulation of Polymer solution is done by varying the Polymer Concentration in the range of 18-22 wt.%. These new Polymer solutions which is consist of polyethersulfone, 1-methyl-2-pyrrolidone (NMP), polyethylene glycol (PEG) and distilled water were developed to be very close to its cloud point (binodal line) in order to accelerate the coagulation of nascent fiber as much as possible so that the relaxation effect on molecular orientation was reduced. The experimental results showed that the flux of the hollow fiber ultrafiltration membranes decreases while the separation performance for particle solute increases with an increase in Polymer Concentration. This means that the outer skin layer of the membranes becomes apparently thicker and denser with increasing Polymer Concentration. On the other hand, spinning asymmetric hollow fiber membranes from a dilute Polymer solution produced a thin and porous skin layer, leading to a high value of flux but a relatively low percentage of rejection for cyclodextrin separation.
-
effect of Polymer Concentration on the structure and performance of pei hollow fiber membrane contactor for co2 stripping
Journal of Hazardous Materials, 2013Co-Authors: R. Naim, A. F. IsmailAbstract:A series of polyetherimide (PEI) hollow fiber membranes with various Polymer Concentrations (13–16 wt.%) for CO2 stripping process in membrane contactor application was fabricated via wet phase inversion method. The PEI membranes were characterized in terms of liquid entry pressure, contact angle, gas permeation and morphology analysis. CO2 stripping performance was investigated via membrane contactor system in a stainless steel module with aqueous diethanolamine as liquid absorbent. The hollow fiber membranes showed decreasing patterns in gas permeation, contact angle, mean pore size and effective surface porosity with increasing Polymer Concentration. On the contrary, wetting pressure of PEI membranes has enhanced significantly with Polymer Concentration. Various Polymer Concentrations have different effects on the CO2 stripping flux in which membrane with 14 wt.% Polymer Concentration showed the highest stripping flux of 2.7 × 10−2 mol/m2 s. From the performance comparison with other commercial membrane, it is anticipated that the PEI membrane has a good prospect in CO2 stripping via membrane contactor.
-
Effect of Polymer Concentration on the structure and performance of PEI hollow fiber membrane contactor for CO2 stripping
Journal of Hazardous Materials, 2013Co-Authors: R. Naim, A. F. IsmailAbstract:A series of polyetherimide (PEI) hollow fiber membranes with various Polymer Concentrations (13-16wt.%) for CO2 stripping process in membrane contactor application was fabricated via wet phase inversion method. The PEI membranes were characterized in terms of liquid entry pressure, contact angle, gas permeation and morphology analysis. CO2 stripping performance was investigated via membrane contactor system in a stainless steel module with aqueous diethanolamine as liquid absorbent. The hollow fiber membranes showed decreasing patterns in gas permeation, contact angle, mean pore size and effective surface porosity with increasing Polymer Concentration. On the contrary, wetting pressure of PEI membranes has enhanced significantly with Polymer Concentration. Various Polymer Concentrations have different effects on the CO2 stripping flux in which membrane with 14wt.% Polymer Concentration showed the highest stripping flux of 2.7×10-2mol/m2s. From the performance comparison with other commercial membrane, it is anticipated that the PEI membrane has a good prospect in CO2 stripping via membrane contactor. © 2013 Elsevier B.V.
-
effect of Polymer Concentration on the structure and performance of polyetherimide hollow fiber membranes
Journal of Membrane Science, 2010Co-Authors: Gh. Bakeri, A. F. Ismail, Mojtaba Shariatyniassar, T. MatsuuraAbstract:Abstract In this paper, polyetherimide (PEI) hollow fiber membranes were used in gas–liquid contacting process. Porous polyetherimide hollow fiber membranes were fabricated via wet phase inversion method. The Polymer Concentration in dope solution varied from 10 to 15 wt%. Water was used as internal and external coagulant. Gas permeation test using helium as test gas, liquid entry pressure of water (LEPw) test and scanning electron microscopy (SEM) were used for membrane characterization. The mean pore size, effective surface porosity and void fraction of membranes decreased as the Polymer Concentration increased, while LEPw and membrane density increased. CO2 absorption rate of fabricated membranes were measured in a gas–liquid hollow fiber membrane contactor system using distilled water as absorbent and the results showed that CO2 absorption rate of membranes increases as Polymer Concentration decreases. In addition, CO2 absorption rate of hollow fiber membranes in which polyetherimide Concentration was between 10 and 12 wt%, was higher than commercial PVDF hollow fiber membranes.
-
Effect of Polymer Concentration on the structure and performance of polyetherimide hollow fiber membranes
Journal of Membrane Science, 2010Co-Authors: Gh. Bakeri, M. Shariaty-niassar, A. F. Ismail, T. MatsuuraAbstract:In this paper, polyetherimide (PEI) hollow fiber membranes were used in gas-liquid contacting process. Porous polyetherimide hollow fiber membranes were fabricated via wet phase inversion method. The Polymer Concentration in dope solution varied from 10 to 15. wt%. Water was used as internal and external coagulant. Gas permeation test using helium as test gas, liquid entry pressure of water (LEPw) test and scanning electron microscopy (SEM) were used for membrane characterization. The mean pore size, effective surface porosity and void fraction of membranes decreased as the Polymer Concentration increased, while LEPw and membrane density increased.CO2 absorption rate of fabricated membranes were measured in a gas-liquid hollow fiber membrane contactor system using distilled water as absorbent and the results showed that CO2 absorption rate of membranes increases as Polymer Concentration decreases. In addition, CO2 absorption rate of hollow fiber membranes in which polyetherimide Concentration was between 10 and 12wt%, was higher than commercial PVDF hollow fiber membranes. © 2010 Elsevier B.V.
Manuela Mariotti - One of the best experts on this subject based on the ideXlab platform.
-
Modelling of methylcellulose thermogelation as a function of Polymer Concentration and dissolution media properties
LWT - Food Science and Technology, 2015Co-Authors: Cristina Alamprese, Manuela MariottiAbstract:A large number of factors can influence hydrocolloid properties, but little basic research has been performed on this topic, mainly evaluating one factor at a time. The aim of this work was to study the thermogelation of methylcellulose as a function of Polymer Concentration (1-3g/100g), and pH (4-10) and salt Concentration (50-150mmol/L) of the aqueous dissolution buffer. To simultaneously evaluate the effects of the different factors and of their interactions, a Box Behnken Design of Experiment was applied. Thermogelation was evaluated by means of fundamental and empirical rheological methods. Significant response surface models describing methylcellulose structuring properties as a function of the three considered factors were calculated. In particular, buffer pH and Concentration seemed to mainly influence the fundamental rheological behavior of the methylcellulose systems, whereas variables evaluated at higher strains were especially affected by the Polymer Concentration. The salt-out effect of the phosphate salts used is also discussed. The obtained models represent a first step for a deeper knowledge of the molecular interactions in food systems. They could be exploited in the development of new foods, making easier the modulation of the structural and textural features of products.
Cristina Alamprese - One of the best experts on this subject based on the ideXlab platform.
-
Modelling of methylcellulose thermogelation as a function of Polymer Concentration and dissolution media properties
LWT - Food Science and Technology, 2015Co-Authors: Cristina Alamprese, Manuela MariottiAbstract:A large number of factors can influence hydrocolloid properties, but little basic research has been performed on this topic, mainly evaluating one factor at a time. The aim of this work was to study the thermogelation of methylcellulose as a function of Polymer Concentration (1-3g/100g), and pH (4-10) and salt Concentration (50-150mmol/L) of the aqueous dissolution buffer. To simultaneously evaluate the effects of the different factors and of their interactions, a Box Behnken Design of Experiment was applied. Thermogelation was evaluated by means of fundamental and empirical rheological methods. Significant response surface models describing methylcellulose structuring properties as a function of the three considered factors were calculated. In particular, buffer pH and Concentration seemed to mainly influence the fundamental rheological behavior of the methylcellulose systems, whereas variables evaluated at higher strains were especially affected by the Polymer Concentration. The salt-out effect of the phosphate salts used is also discussed. The obtained models represent a first step for a deeper knowledge of the molecular interactions in food systems. They could be exploited in the development of new foods, making easier the modulation of the structural and textural features of products.
Banu Örmeci - One of the best experts on this subject based on the ideXlab platform.
-
Optimization of Polymer Dose Based on Residual Polymer Concentration in Dewatering Supernatant
Water Air and Soil Pollution, 2014Co-Authors: Fares A. Al Momani, Banu ÖrmeciAbstract:Optimization of sludge conditioning and dewatering is a continuing challenge for wastewater treatment plants. This study investigated the use of an in-line UV–vis spectrophotometer to optimize the Polymer dose during sludge dewatering. The study established a relationship between the optimum Polymer dose and residual Polymer Concentration in filtrate using UV–vis absorbance measurements at 191.5 nm. Experiments were carried out with four different Polymers (FloPolymer CA 475, CAB 4500, FloPolymer CB 4350, and FloPolymer CA 4600), and similar results were obtained from all Polymers. Detection limits of the Polymers ranged from 0.35 to 0.95 mg/L in centrate. The optimum Polymer dose was determined based on capillary suction time (CST) and filtration tests, and a relationship between the filtrate absorbance at 191.5 nm and optimum Polymer dose was established. In the under-dose range, increasing the Polymer dose resulted in a decrease in filtrate absorbance due to improvement in filtrate quality. The optimum Polymer dose corresponded to the minimum filtrate absorbance at 191.5 nm. When the optimum dose was exceeded, absorbance values started to increase corresponding to the increase in the residual Polymer Concentration in filtrate in the over-dose range. These results indicate that real-time optimization of Polymer dose can potentially be achieved at wastewater treatment plants using an in-line UV–vis spectrophotometer based on the absorbance of centrate or filtrate samples at 191.5 nm.
-
Quantification of Polymer Concentration in water using UV-Vis spectroscopy
Journal of Water Supply Research and Technology-aqua, 2013Co-Authors: Meaghan K. Gibbons, Banu ÖrmeciAbstract:The goal of this study was to develop a method that uses UV-Vis spectroscopy for the determination of residual Polymer Concentration water and environmental samples. UV-Vis absorbance measurements are quick and simple and can be usefully applied in research and practice. Five different Polymers exhibiting a wide range of Polymer characteristics were tested in the UV range of 200–300 nm. The incremental increases in Polymer Concentrations corresponded to incremental increases in absorbance measurements, and a strong linear relationship was established between the Polymer Concentration and the absorbance values. The method was successfully used in the determination of Polymer Concentrations in water samples, as well as in centrate samples collected from a wastewater treatment plant.
R. Naim - One of the best experts on this subject based on the ideXlab platform.
-
effect of Polymer Concentration on the structure and performance of pei hollow fiber membrane contactor for co2 stripping
Journal of Hazardous Materials, 2013Co-Authors: R. Naim, A. F. IsmailAbstract:A series of polyetherimide (PEI) hollow fiber membranes with various Polymer Concentrations (13–16 wt.%) for CO2 stripping process in membrane contactor application was fabricated via wet phase inversion method. The PEI membranes were characterized in terms of liquid entry pressure, contact angle, gas permeation and morphology analysis. CO2 stripping performance was investigated via membrane contactor system in a stainless steel module with aqueous diethanolamine as liquid absorbent. The hollow fiber membranes showed decreasing patterns in gas permeation, contact angle, mean pore size and effective surface porosity with increasing Polymer Concentration. On the contrary, wetting pressure of PEI membranes has enhanced significantly with Polymer Concentration. Various Polymer Concentrations have different effects on the CO2 stripping flux in which membrane with 14 wt.% Polymer Concentration showed the highest stripping flux of 2.7 × 10−2 mol/m2 s. From the performance comparison with other commercial membrane, it is anticipated that the PEI membrane has a good prospect in CO2 stripping via membrane contactor.
-
Effect of Polymer Concentration on the structure and performance of PEI hollow fiber membrane contactor for CO2 stripping
Journal of Hazardous Materials, 2013Co-Authors: R. Naim, A. F. IsmailAbstract:A series of polyetherimide (PEI) hollow fiber membranes with various Polymer Concentrations (13-16wt.%) for CO2 stripping process in membrane contactor application was fabricated via wet phase inversion method. The PEI membranes were characterized in terms of liquid entry pressure, contact angle, gas permeation and morphology analysis. CO2 stripping performance was investigated via membrane contactor system in a stainless steel module with aqueous diethanolamine as liquid absorbent. The hollow fiber membranes showed decreasing patterns in gas permeation, contact angle, mean pore size and effective surface porosity with increasing Polymer Concentration. On the contrary, wetting pressure of PEI membranes has enhanced significantly with Polymer Concentration. Various Polymer Concentrations have different effects on the CO2 stripping flux in which membrane with 14wt.% Polymer Concentration showed the highest stripping flux of 2.7×10-2mol/m2s. From the performance comparison with other commercial membrane, it is anticipated that the PEI membrane has a good prospect in CO2 stripping via membrane contactor. © 2013 Elsevier B.V.