Improved microstructure of asymmetric niobium pentoxide hollow fiber membranes |
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| Affiliation: | 1. Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, China;2. College of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, China;3. College of Information Science and Engineering, Guilin University of Technology, Guilin, 541004, China;1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, China;2. School of Aeronautics and Astronautics, Central South University, Changsha, Hunan 410083, China;1. Department of Materials Science and Engineering, University of Sheffield, S1 3JD, UK;2. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi''an, 710049, China;3. Micro-Optoelectronic Systems Laboratories, Xi’an Technological University, Xi’an, 710032, Shaanxi, China;1. CAS Key Lab of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. School of Engineering, RMIT University, Melbourne, VIC, 3000, Australia;3. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;4. Kunshan Shuangqiao Sensor Ltd. Co., Suzhou 215300, China |
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| Abstract: | Asymmetric niobium pentoxide (Nb2O5) hollow fiber membranes were prepared by the phase inversion and sintering process at temperatures ranging from 1000 to 1350°C. The effects of extrusion parameters on the morphology and properties of the produced membranes were systematically explored. Asymmetric hollow fibers with regular inner contour were obtained at extrusion flow rates of 15 and 25 ml min?1 of ceramic suspension and internal coagulant, respectively. Hollow fibers sintered at temperatures greater than 1200°C presented modifications in the morphology of Nb2O5 grains, which were also evidenced by X-ray diffraction and Raman analyses. Hollow fibers produced with an air gap of 50 mm presented a dense outer sponge-like layer and micro-voids formed from the inner surface. These hollow fibers sintered at 1200°C presented suitable bending resistance and water permeability (24.2 ± 0.60 MPa and 3.00 ± 0.01 L h-1 m-2 kPa-1, respectively). The outer sponge like layer was mitigated when the fibers were produced without air-gap. |
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| Keywords: | Ceramic membranes Niobium pentoxide Asymmetric hollow fiber Phase inversion |
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