The Experts below are selected from a list of 18828 Experts worldwide ranked by ideXlab platform
Changfa Xiao - One of the best experts on this subject based on the ideXlab platform.
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Progress on polymeric Hollow Fiber Membrane preparation technique from the perspective of green and sustainable development
Chemical Engineering Journal, 2021Co-Authors: Yan Huang, Qinglin Huang, Changfa Xiao, Hailiang Liu, Jian ZhaoAbstract:Abstract Membrane separation using Hollow Fiber Membrane has become one of the emerging technologies which underwent rapid development for various applications during the past few decades. A further improvement and development of the Membrane technology is required for satisfying the current needs of environmental protection, rational use of resources and special separation under harsh conditions. A new solvent-free or solvent-poor process alternative may have great potential to compete with traditional processes. In this regard, sustainable processes and environment-friendly preparation techniques have been developed in making high-performance Hollow Fiber Membranes recently. This article provides an overview of recent progresses on common preparation method of polymeric Hollow Fiber Membranes from the view of environmental protection and health safety. Recent advances in fabrication techniques of Hollow Fiber Membranes from the green and sustainable perspective, especially by melt/solution integrated homogeneous-reinforcement method, homogeneous braid reinforced Hollow Fiber Membrane, melt spinning-stretching interfacial phase separation method, and nanoFibers-covered Hollow Fiber Membrane via continuous electrospinning have been introduced in detail. The review ends with several recommendations for future research and development on Hollow Fiber Membranes.
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Fabrication and characterization of novel foaming polyurethane Hollow Fiber Membrane
Chinese Journal of Chemical Engineering, 2019Co-Authors: Changfa Xiao, Hailiang Liu, Qinglin HuangAbstract:Abstract Foam-like materials had attracted great interest as promising absorbent. In this study, thermoplastic polyurethane (TPU) block sponge was synthesized. Polyester (PET) braid tubular reinforced polyurethane (PU) spongy Hollow Fiber Membrane was prepared by a concentric circular spinning method. The method was woven from an outer coated water-blown PU separation layer and inner PET braid tubular. We have developed a simple and useful preparation technique for the PU spongy Hollow Fiber Membrane. For the first time, the PU spongy Hollow Fiber Membrane was prepared using a coating and controlled foaming technique. The influence of toluene isocyanate index on the physical properties, morphology, and structure of flexible PU sponge was discussed in terms of water contact angle (CA), pure water flux (PWF), Fourier Transform Infrared Analysis (FTIR), pressure-responsive property, and pull-out strength. The morphologies of the Membranes were investigated by scanning electron microscopy. We have characterized the foams from an intuitive point of view and demonstrated that the dimensional morphology of the Membrane was closely related to isocyanate index. The result showed that the surface cell size of the PU sponge Hollow Fiber Membrane gradually decreased with an increase of the isocyanate index. Due to the elasticity of PU at room temperature, the pressure responsive characteristic of the Membrane was prepared. When isocyanate index was 1.05, the interface bonding strength of PU spongy Hollow Fiber Membranes reached as high as 0.37 MPa, porosity and PWF were 71.5% and 415.5 L·m−2·h−1, respectively.
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Novel Ultrafine Fibrous Poly(tetrafluoroethylene) Hollow Fiber Membrane Fabricated by Electrospinning
Polymers, 2018Co-Authors: Qinglin Huang, Mengyuan Zhang, Yan Huang, Changfa XiaoAbstract:Novel poly(tetrafluoroethylene) (PTFE) Hollow Fiber Membranes were successfully fabricated by electrospinning, with ultrafine fibrous PTFE Membranes as separation layers, while a porous glassFiber braided tube served as the supporting matrix. During this process, PTFE/poly(vinylalcohol) (PVA) ultrafine fibrous Membranes were electrospun while covering the porous glassFiber braided tube; then, the nascent PTFE/PVA Hollow Fiber Membrane was obtained. In the following sintering process, the spinning carrier PVA decomposed; meanwhile, the ultrafine fibrous PTFE Membrane shrank inward so as to further integrate with the supporting matrix. Therefore, the ultrafine fibrous PTFE Membranes had excellent interface bonding strength with the supporting matrix. Moreover, the obtained ultrafine fibrous PTFE Hollow Fiber Membrane exhibited superior performances in terms of strong hydrophobicity (CA > 140°), high porosity (>70%), and sharp pore size distribution. The comprehensive properties indicated that the ultrafine fibrous PTFE Hollow Fiber Membranes could have potentially useful applications in Membrane contactors (MC), especially Membrane distillation (MD) in harsh water environments.
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Novel Ultrafine Fibrous Poly(tetrafluoroethylene) Hollow Fiber Membrane Fabricated by Electrospinning
Polymers, 2018Co-Authors: Qinglin Huang, Mengyuan Zhang, Yan Huang, Changfa XiaoAbstract:Novel poly(tetrafluoroethylene) (PTFE) Hollow Fiber Membranes were successfully fabricated by electrospinning, with ultrafine fibrous PTFE Membranes as separation layers, while a porous glassFiber braided tube served as the supporting matrix. During this process, PTFE/poly(vinylalcohol) (PVA) ultrafine fibrous Membranes were electrospun while covering the porous glassFiber braided tube; then, the nascent PTFE/PVA Hollow Fiber Membrane was obtained. In the following sintering process, the spinning carrier PVA decomposed; meanwhile, the ultrafine fibrous PTFE Membrane shrank inward so as to further integrate with the supporting matrix. Therefore, the ultrafine fibrous PTFE Membranes had excellent interface bonding strength with the supporting matrix. Moreover, the obtained ultrafine fibrous PTFE Hollow Fiber Membrane exhibited superior performances in terms of strong hydrophobicity (CA > 140°), high porosity (>70%), and sharp pore size distribution. The comprehensive properties indicated that the ultrafine fibrous PTFE Hollow Fiber Membranes could have potentially useful applications in Membrane contactors (MC), especially Membrane distillation (MD) in harsh water environments.
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Effect of stretching on continuous oil/water separation performance of polypropylene Hollow Fiber Membrane
Iranian Polymer Journal, 2017Co-Authors: Junqiang Hao, Changfa Xiao, Hailiang Liu, Fan Zhili, Jian Zhao, Li ChenAbstract:In this work, polypropylene (PP) Hollow Fiber Membranes were fabricated by thermal-induced phase separation method. The influence of cold-stretched and hot-stretched treatment on the morphology and permeability of the PP Hollow Fiber Membranes was investigated. The results showed that there were cracks and crystalline particulate structures on the outer and inner surfaces of the stretched PP Hollow Fiber Membranes, which were not isolated but linked together through Fiber-like connections. Compared to the original PP Hollow Fiber Membrane, the mean pore sizes, the porosities, the hydrophobicity and water entry pressure of the stretched PP Hollow Fiber Membranes improved significantly. When applied in conjunction with a vacuum system, the PP Hollow Fiber Membranes could continuously remove oils from water surface, and separate surfactant-free and surfactant-stabilized water-in-oil emulsions, as well. The initial kerosene fluxes of the hot-stretched PP Hollow Fiber Membrane were higher than that of the Membranes prepared from original PP Hollow Fibers or cold-stretched PP Hollow Fibers. The permeate fluxes of the hot-stretched PP Hollow Fiber Membrane for all different emulsion separations were higher than those of the original PP Hollow Fiber Membrane. There could be seen no emulsion droplet in the optical micrographs after separation, indicating that the water-in-oil emulsions were effectively separated in one-step method.
Dipak Rana - One of the best experts on this subject based on the ideXlab platform.
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a novel surface modified polyvinylidene fluoride Hollow Fiber Membrane contactor for co2 absorption
Journal of Membrane Science, 2012Co-Authors: Masoud Rahbarisisakht, Ahmad Fauzi Ismail, Dipak Rana, Takeshi MatsuuraAbstract:A novel surface modified polyvinylidene fluoride (PVDF) Hollow Fiber Membrane was fabricated via a dry–wet phased inversion process. A surface modifying macromolecule (SMM) was used as an additive in the spinning dope. During phase inversion SMM migrates to the Membrane surface and functions as both a pore former and surface modifier. The surface modified PVDF Membrane showed large pore size, higher effective surface porosity, contact angle and porosity but lower critical water entry pressure compared to the PVDF Hollow Fiber Membrane without SMM. The performance of the surface modified Membrane in contactor application for CO2 absorption via distilled water as absorbent was studied. The results show that the surface modified PVDF Membrane has higher performance compared to control PVDF Membranes. With the Membrane prepared from SMM in the spinning dope a maximum CO2 flux of 7.7×10−4 mol/m2 s was achieved at 300 ml/min of absorbent flow rate, which was almost 93% more than the other Membrane. In a long-term stability study, CO2 flux was decreased only about 7.7% by using surface modified PVDF Membrane during 150 h operation.
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a novel surface modified polyetherimide Hollow Fiber Membrane for gas liquid contacting processes
Separation and Purification Technology, 2012Co-Authors: Ahmad Fauzi Ismail, Takeshi Matsuura, Ghazali Bakeri, Dipak RanaAbstract:Abstract A novel surface modified polyetherimide (PEI) Hollow Fiber Membrane was fabricated via dry–wet phased inversion process where the spinning dope contains Surface Modifying Macromolecule (SMM). The surface modified Membrane exhibited large pore size, higher effective surface porosity, contact angle and porosity but lower Liquid Entry Pressure of water compared to polyetherimide Hollow Fiber Membrane without SMM. The performance of surface modified Membrane in contactor application for gas separation process was evaluated based on CO 2 absorption process using water as absorbent and pure CO 2 and 20:80 CO 2 /CH 4 gas mixture. The results show that surface modified Membranes have superior performance compared to commercial and in-house made hydrophobic Membranes such as polypropylene and polytetrafluoroethylene, e.g., in the case of pure CO 2 in the shell side and distilled water in the lumen side, the surface modified PEI Membrane shows 72% higher absorption flux than commercial Membrane contactor, Celgard MiniModule® 0.75X5 which is made of polypropylene Membranes, when the liquid velocity is 0.4 m s −1 .
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A novel surface modified polyetherimide Hollow Fiber Membrane for gas–liquid contacting processes
Separation and Purification Technology, 2012Co-Authors: Ghazali Bakeri, Ahmad Fauzi Ismail, Takeshi Matsuura, Dipak RanaAbstract:Abstract A novel surface modified polyetherimide (PEI) Hollow Fiber Membrane was fabricated via dry–wet phased inversion process where the spinning dope contains Surface Modifying Macromolecule (SMM). The surface modified Membrane exhibited large pore size, higher effective surface porosity, contact angle and porosity but lower Liquid Entry Pressure of water compared to polyetherimide Hollow Fiber Membrane without SMM. The performance of surface modified Membrane in contactor application for gas separation process was evaluated based on CO 2 absorption process using water as absorbent and pure CO 2 and 20:80 CO 2 /CH 4 gas mixture. The results show that surface modified Membranes have superior performance compared to commercial and in-house made hydrophobic Membranes such as polypropylene and polytetrafluoroethylene, e.g., in the case of pure CO 2 in the shell side and distilled water in the lumen side, the surface modified PEI Membrane shows 72% higher absorption flux than commercial Membrane contactor, Celgard MiniModule® 0.75X5 which is made of polypropylene Membranes, when the liquid velocity is 0.4 m s −1 .
Yoichiro Kawaguchi - One of the best experts on this subject based on the ideXlab platform.
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development of silicone rubber Hollow Fiber Membrane oxygenator for ecmo
Artificial Organs, 2003Co-Authors: Tadashi Motomura, Koshiro Sato, Shinji Kawahito, Tomohiro Maeda, Seiji Ichikawa, Hiroshi Ishitoya, Masaki Kawamura, Toshiyuki Shinohara, Takahiro Matsui, Yoichiro KawaguchiAbstract:Silicone rubber Hollow Fiber Membrane produces an ideal gas exchange for long-term ECMO due to nonporous characteristics. The extracapillary type silicone rubber ECMO oxygenator having an ultrathin Hollow Fiber Membrane was developed for pediatric application. The test modules were compared to conventional silicone coil-type ECMO modules. In vitro experiments demonstrated a higher O 2 and CO 2 transfer rate, lower blood flow resistance, and less hemolysis than the conventional silicone coil-type modules. This oxygenator was combined with the Gyro C1E3 centrifugal pump, and three ex vivo experiments were conducted to simulate pediatric V-A ECMO condition. Four day and 6 day experiments were conducted in cases 1 and 2, respectively. Case 3 was a long-term experiment up to 2 weeks. No plasma leakage and stable gas performances were achieved. The plasma free hemoglobin was maintained within a normal range. This compact pump-oxygenator system in conjunction with the Gyro C1E3 centrifugal pump has potential for a hybrid total ECMO system.
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development of silicone rubber Hollow Fiber Membrane oxygenator for ecmo
Artificial Organs, 2003Co-Authors: Tadashi Motomura, Koshiro Sato, Shinji Kawahito, Tomohiro Maeda, Seiji Ichikawa, Hiroshi Ishitoya, Masaki Kawamura, Toshiyuki Shinohara, Takahiro Matsui, Yoichiro KawaguchiAbstract:Silicone rubber Hollow Fiber Membrane produces an ideal gas exchange for long-term ECMO due to nonporous characteristics. The extracapillary type silicone rubber ECMO oxygenator having an ultrathin Hollow Fiber Membrane was developed for pediatric application. The test modules were compared to conventional silicone coil-type ECMO modules. In vitro experiments demonstrated a higher O 2 and CO 2 transfer rate, lower blood flow resistance, and less hemolysis than the conventional silicone coil-type modules. This oxygenator was combined with the Gyro C1E3 centrifugal pump, and three ex vivo experiments were conducted to simulate pediatric V-A ECMO condition. Four day and 6 day experiments were conducted in cases 1 and 2, respectively. Case 3 was a long-term experiment up to 2 weeks. No plasma leakage and stable gas performances were achieved. The plasma free hemoglobin was maintained within a normal range. This compact pump-oxygenator system in conjunction with the Gyro C1E3 centrifugal pump has potential for a hybrid total ECMO system.
Fook-sin Wong - One of the best experts on this subject based on the ideXlab platform.
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Shell side mass transfer in a transverse flow Hollow Fiber Membrane contactor
Journal of Membrane Science, 2005Co-Authors: Ju-meng Zheng, Zheng-wei Dai, Fook-sin WongAbstract:Abstract The free surface model was introduced to describe the shell side fluid flow in a transverse flow Hollow Fiber Membrane contactor, and a new method was developed to calculate the shell side hydraulic diameter, the effective average velocity, and the Reynolds number. An empirical shell side mass transfer correlation was presented for commercial Liqui-Cel® Extra-Flow contactors on the basis of the experimental data reported by Sengupta et al. The data were correlated very well with maximum discrepancies of ±10% between the predicted and observed results.
Qinglin Huang - One of the best experts on this subject based on the ideXlab platform.
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Progress on polymeric Hollow Fiber Membrane preparation technique from the perspective of green and sustainable development
Chemical Engineering Journal, 2021Co-Authors: Yan Huang, Qinglin Huang, Changfa Xiao, Hailiang Liu, Jian ZhaoAbstract:Abstract Membrane separation using Hollow Fiber Membrane has become one of the emerging technologies which underwent rapid development for various applications during the past few decades. A further improvement and development of the Membrane technology is required for satisfying the current needs of environmental protection, rational use of resources and special separation under harsh conditions. A new solvent-free or solvent-poor process alternative may have great potential to compete with traditional processes. In this regard, sustainable processes and environment-friendly preparation techniques have been developed in making high-performance Hollow Fiber Membranes recently. This article provides an overview of recent progresses on common preparation method of polymeric Hollow Fiber Membranes from the view of environmental protection and health safety. Recent advances in fabrication techniques of Hollow Fiber Membranes from the green and sustainable perspective, especially by melt/solution integrated homogeneous-reinforcement method, homogeneous braid reinforced Hollow Fiber Membrane, melt spinning-stretching interfacial phase separation method, and nanoFibers-covered Hollow Fiber Membrane via continuous electrospinning have been introduced in detail. The review ends with several recommendations for future research and development on Hollow Fiber Membranes.
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Fabrication and characterization of novel foaming polyurethane Hollow Fiber Membrane
Chinese Journal of Chemical Engineering, 2019Co-Authors: Changfa Xiao, Hailiang Liu, Qinglin HuangAbstract:Abstract Foam-like materials had attracted great interest as promising absorbent. In this study, thermoplastic polyurethane (TPU) block sponge was synthesized. Polyester (PET) braid tubular reinforced polyurethane (PU) spongy Hollow Fiber Membrane was prepared by a concentric circular spinning method. The method was woven from an outer coated water-blown PU separation layer and inner PET braid tubular. We have developed a simple and useful preparation technique for the PU spongy Hollow Fiber Membrane. For the first time, the PU spongy Hollow Fiber Membrane was prepared using a coating and controlled foaming technique. The influence of toluene isocyanate index on the physical properties, morphology, and structure of flexible PU sponge was discussed in terms of water contact angle (CA), pure water flux (PWF), Fourier Transform Infrared Analysis (FTIR), pressure-responsive property, and pull-out strength. The morphologies of the Membranes were investigated by scanning electron microscopy. We have characterized the foams from an intuitive point of view and demonstrated that the dimensional morphology of the Membrane was closely related to isocyanate index. The result showed that the surface cell size of the PU sponge Hollow Fiber Membrane gradually decreased with an increase of the isocyanate index. Due to the elasticity of PU at room temperature, the pressure responsive characteristic of the Membrane was prepared. When isocyanate index was 1.05, the interface bonding strength of PU spongy Hollow Fiber Membranes reached as high as 0.37 MPa, porosity and PWF were 71.5% and 415.5 L·m−2·h−1, respectively.
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Novel Ultrafine Fibrous Poly(tetrafluoroethylene) Hollow Fiber Membrane Fabricated by Electrospinning
Polymers, 2018Co-Authors: Qinglin Huang, Mengyuan Zhang, Yan Huang, Changfa XiaoAbstract:Novel poly(tetrafluoroethylene) (PTFE) Hollow Fiber Membranes were successfully fabricated by electrospinning, with ultrafine fibrous PTFE Membranes as separation layers, while a porous glassFiber braided tube served as the supporting matrix. During this process, PTFE/poly(vinylalcohol) (PVA) ultrafine fibrous Membranes were electrospun while covering the porous glassFiber braided tube; then, the nascent PTFE/PVA Hollow Fiber Membrane was obtained. In the following sintering process, the spinning carrier PVA decomposed; meanwhile, the ultrafine fibrous PTFE Membrane shrank inward so as to further integrate with the supporting matrix. Therefore, the ultrafine fibrous PTFE Membranes had excellent interface bonding strength with the supporting matrix. Moreover, the obtained ultrafine fibrous PTFE Hollow Fiber Membrane exhibited superior performances in terms of strong hydrophobicity (CA > 140°), high porosity (>70%), and sharp pore size distribution. The comprehensive properties indicated that the ultrafine fibrous PTFE Hollow Fiber Membranes could have potentially useful applications in Membrane contactors (MC), especially Membrane distillation (MD) in harsh water environments.
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Novel Ultrafine Fibrous Poly(tetrafluoroethylene) Hollow Fiber Membrane Fabricated by Electrospinning
Polymers, 2018Co-Authors: Qinglin Huang, Mengyuan Zhang, Yan Huang, Changfa XiaoAbstract:Novel poly(tetrafluoroethylene) (PTFE) Hollow Fiber Membranes were successfully fabricated by electrospinning, with ultrafine fibrous PTFE Membranes as separation layers, while a porous glassFiber braided tube served as the supporting matrix. During this process, PTFE/poly(vinylalcohol) (PVA) ultrafine fibrous Membranes were electrospun while covering the porous glassFiber braided tube; then, the nascent PTFE/PVA Hollow Fiber Membrane was obtained. In the following sintering process, the spinning carrier PVA decomposed; meanwhile, the ultrafine fibrous PTFE Membrane shrank inward so as to further integrate with the supporting matrix. Therefore, the ultrafine fibrous PTFE Membranes had excellent interface bonding strength with the supporting matrix. Moreover, the obtained ultrafine fibrous PTFE Hollow Fiber Membrane exhibited superior performances in terms of strong hydrophobicity (CA > 140°), high porosity (>70%), and sharp pore size distribution. The comprehensive properties indicated that the ultrafine fibrous PTFE Hollow Fiber Membranes could have potentially useful applications in Membrane contactors (MC), especially Membrane distillation (MD) in harsh water environments.