Relevant bibliographies by topics / Dual layer membranes

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Dual layer membranes'

Author: Grafiati
Published: 10 January 2023
Last updated: 28 January 2023

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Journal articles on the topic "Dual layer membranes"

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Boztepe, Inci, Stephen Gray, Jianhua Zhang, and Jun-De Li. "Performance modelling of direct contact membrane distillation using a hydrophobic/hydrophilic dual-layer membrane." Journal of Water Reuse and Desalination 11, no. 3 (June 17, 2021): 490–507. http://dx.doi.org/10.2166/wrd.2021.072.

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Abstract HFP-co-PVDF/N6 hydrophobic/hydrophilic dual-layer membrane was used to study desalination with direct contact membrane distillation (DCMD). A one-dimensional (1-D) model was proposed to predict the flux and thermal efficiency. Heat and mass transfer equations were solved numerically for the combined hydrophilic and hydrophobic layers. The membrane characteristics of the hydrophobic layer were considered for the calculation of the mass transfer coefficients, while the hydrophilic layer was ignored since it was assumed to be filled with water. However, the hydrophilic layer was taken into account during the calculations of conductive heat transfer. Therefore, the equations are different, compared to single-layer hydrophobic membranes. It was found that with the same hydrophobic membrane characteristics, the single-layer membranes performed with better flux and thermal efficiency than the dual-layer membranes. Furthermore, the improvement of flux and thermal efficiency by an addition of the hydrophilic layer has not been observed experimentally, and it is suggested that the improved performance for dual-layer membranes reported previously is due to improved permeability by using thinner and more porous hydrophobic layers that can be mechanically reinforced by the hydrophilic layer. The validation of the model was conducted by comparing the experimental results for single- and dual-layer membranes with the modelling results. The predicted flux and thermal efficiency by the modelling were within 10% error to the experimental results.
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Grünig, Lara, Ulrich A. Handge, Joachim Koll, Oliver Gronwald, Martin Weber, Birgit Hankiewicz, Nico Scharnagl, and Volker Abetz. "Hydrophilic Dual Layer Hollow Fiber Membranes for Ultrafiltration." Membranes 10, no. 7 (July 6, 2020): 143. http://dx.doi.org/10.3390/membranes10070143.

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In this study, a triblock copolymer was used as additive to fabricate new dual layer hollow fiber membranes with a hydrophilic active inner surface in order to improve their fouling resistance. The polymeric components of the solutions for membrane fabrication were poly(ether sulfone), poly(N-vinyl pyrrolidone), and the triblock copolymer. The additive consists of three blocks: a middle hydrophobic poly(ether sulfone) block and two outer hydrophilic alkyl poly(ethylene glycol) blocks. By varying the additive concentration in the solutions, it was possible to fabricate dual layer hollow fiber membranes that are characterized by a hydrophilic inner layer, a pure water permeance of over 1800 L/(m2 bar h) and a molecular weight cut-off of 100 kDa similar to commercial membranes. Contact angle and composition determination by XPS measurements revealed the hydrophilic character of the membranes, which improved with increasing additive concentration. Rheological, dynamic light scattering, transmission, and cloud point experiments elucidated the molecular interaction, precipitation, and spinning behavior of the solutions. The low-molecular weight additive reduces the solution viscosity and thus the average relaxation time. On the contrary, slow processes appear with increasing additive concentration in the scattering data. Furthermore, phase separation occurred at a lower non-solvent concentration and the precipitation time increased with increasing additive content. These effects revealed a coupling mechanism of the triblock copolymer with poly(N-vinyl pyrrolidone) in solution. The chosen process parameters as well as the additive solutions provide an easy and inexpensive way to create an antifouling protection layer in situ with established recipes of poly(ether sulfone) hollow fiber membranes. Therefore, the membranes are promising candidates for fast integration in the membrane industry.
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Tsai, Chung-Yi, Siu-Yue Tam, Yunfeng Lu, and C. Jeffrey Brinker. "Dual-layer asymmetric microporous silica membranes." Journal of Membrane Science 169, no. 2 (May 2000): 255–68. http://dx.doi.org/10.1016/s0376-7388(99)00343-9.

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Jang, Kyunghoon, Thanh-Tin Nguyen, Eunsung Yi, Chang Seong Kim, Soo Wan Kim, and In S. Kim. "Open Pore Ultrafiltration Hollow Fiber Membrane Fabrication Method via Dual Pore Former with Dual Dope Solution Phase." Membranes 12, no. 11 (November 13, 2022): 1140. http://dx.doi.org/10.3390/membranes12111140.

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Hollow-fiber membranes are widely used in various fields of membrane processes because of their numerous properties, e.g., large surface area, high packing density, mass production with uniform quality, obvious end-of-life indicators, and so on. However, it is difficult to control the pores and internal properties of hollow-fiber membranes due to their inherent structure: a hollow inside surrounded by a wall membrane. Herein, we aimed to control pores and the internal structure of hollow-fiber membranes by fabricating a dual layer using a dual nozzle. Two different pore formers, polyethylene glycol (PEG) and polyvinyl pyrrolidone (PVP), were separately prepared in the dope solutions and used for spinning the dual layer. Our results show that nanoscale pores could be formed on the lumen side (26.8–33.2 nm), and the open pores continuously increased in size toward the shell side. Due to robust pore structure, our fabricated membrane exhibited a remarkable water permeability of 296.2 ± 5.7 L/m2·h·bar and an extremely low BSA loss rate of 0.06 ± 0.02%, i.e., a high BSA retention of 99.94%. In consideration of these properties, the studied membranes are well-suited for use in either water treatment or hemodialysis. Overall, our membranes could be considered for the latter application with a high urea clearance of 257.6 mL/min, which is comparable with commercial membranes.
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Vatani, M., A. Raisi, and G. Pazuki. "Pervaporation separation of ethyl acetate from aqueous solutions using ZSM-5 filled dual-layer poly(ether-block-amide)/polyethersulfone membrane." RSC Advances 8, no. 9 (2018): 4713–25. http://dx.doi.org/10.1039/c7ra13382k.

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Dual-layer mixed matrix membranes were prepared by incorporating ZSM-5 zeolite into PEBA as an active layer on the PES membrane as a support layer for pervaporation separation of EAc from the EAc/water mixtures.
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Kim, Jihyeon, Jinwon Lee, Lindsey B. Bezek, Bumjin Park, and Kwan-Soo Lee. "Use of Nucleating Agent NA11 in the Preparation of Polyvinylidene Fluoride Dual-Layer Hollow Fiber Membranes." Membranes 13, no. 1 (January 7, 2023): 75. http://dx.doi.org/10.3390/membranes13010075.

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Polyvinylidene fluoride (PVDF) dual-layer hollow fiber membranes were simultaneously fabricated by thermally induced phase separation (TIPS) and non-solvent induced phase separation (NIPS) methods using a triple orifice spinneret (TOS) for water treatment application. The support layer was prepared from a TIPS dope solution, which was composed of PVDF, gamma-butyrolactone (GBL), and N-methyl-2-pyrrolidone (NMP). The coating layer was prepared from a NIPS dope solution, which was composed of PVDF, N,N-dimethylacetamide (DMAc), and polyvinylpyrrolidone (PVP). In order to improve the mechanical strength of the dual-layer hollow fiber, a nucleating agent, sodium 2,2′-methylene bis-(4,6-di-tert-butylphenyl) phosphate (NA11), was added to the TIPS dope solution. The performance of the membrane was evaluated by surface and cross-sectional morphology, water flux, mechanical strength, and thermal property. Our results demonstrate that NA11 improved the mechanical strength of the PVDF dual-layer hollow fiber membranes by up to 42%. In addition, the thickness of the coating layer affected the porosity of the membrane and mechanical performance to have high durability in enduring harsh processing conditions.
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Shi, Huyan, Lixin Xue, Ailin Gao, and Qingbo Zhou. "Dual layer hollow fiber PVDF ultra-filtration membranes containing Ag nano-particle loaded zeolite with longer term anti-bacterial capacity in salt water." Water Science and Technology 73, no. 9 (February 5, 2016): 2159–67. http://dx.doi.org/10.2166/wst.2016.062.

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Dual layer polyvinylidene fluoride (PVDF), antibacterial, hollow fiber, ultra-filtration composite membranes with antibacterial particles (silver (Ag) nano-particles loaded zeolite (Z-Ag)) in the outer layer were prepared with high water flux and desired pore sizes. The amounts of Ag+ released from the composite membranes, freshly made and stored in water and salt solution, were measured. The result indicated that dual layer PVDF antibacterial hollow fiber containing Z-Ag (M-1-Ag) still possessed the ability of continuous release of Ag+ even after exposure to water with high ionic content, showing a longer term resistance to bacterial adhesion and antibacterial activity than membrane doped with Z-Ag+ (M-1). Results from an anti-adhesion and bacteria killing test with Escherichia coli supported that the antibacterial efficiency of dual hollow fiber PVDF membranes with Z-Ag was much higher than those with Z-Ag+ after long time storage in water or exposure to phosphate buffered saline (PBS) solution. This novel hollow fiber membrane may find applications in constructing sea water pretreatment devices with long term antifouling capability for the desalination processes.
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Park, Sung-Joon, Won-Gi Ahn, Wansuk Choi, Sang-Hee Park, Jong Suk Lee, Hyun Wook Jung, and Jung-Hyun Lee. "A facile and scalable fabrication method for thin film composite reverse osmosis membranes: dual-layer slot coating." Journal of Materials Chemistry A 5, no. 14 (2017): 6648–55. http://dx.doi.org/10.1039/c7ta00891k.

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Xomeritakis, G., N. G. Liu, Z. Chen, Y. B. Jiang, R. Köhn, P. E. Johnson, C. Y. Tsai, et al. "Anodic alumina supported dual-layer microporous silica membranes." Journal of Membrane Science 287, no. 2 (January 2007): 157–61. http://dx.doi.org/10.1016/j.memsci.2006.10.039.

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Hilke, Roland, Neelakanda Pradeep, Ali Reza Behzad, Suzana P. Nunes, and Klaus-Viktor Peinemann. "Block copolymer/homopolymer dual-layer hollow fiber membranes." Journal of Membrane Science 472 (December 2014): 39–44. http://dx.doi.org/10.1016/j.memsci.2014.08.031.

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Dissertations / Theses on the topic "Dual layer membranes"

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Husain, Shabbir. "Mixed Matrix Dual Layer Hollow Fiber Membranes For Natural Gas Separation." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/16178.

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Mixed matrix membranes offer an attractive route to the development of high performance and efficiency membranes required for demanding gas separations. Such membranes combine the advantageous processing characteristics of polymers with the excellent separation productivity and efficiency of molecular sieving materials. This research explores the development of mixed matrix membranes, namely in the form of asymmetric hollow fiber membranes using zeolites as the molecular sieving phase and commercially available high performance polymers as the continuous matrix. Lack of adhesion between the typically hydrophobic polymer and the hydrophilic native zeolite surface is a major hurdle impeding the development of mixed matrix membranes. Silane coupling agents have been used successfully to graft polymer chains to the surface of the zeolite to increase compatibility with the bulk polymer in dense films. However, transitioning from a dense film to an asymmetric structure typically involves significant processing changes, the most important among them being the use of phase separation to form the asymmetric porous structure. During the phase separation, it is believed that hydrophilic sieves can act as nucleating agents for the hydrophilic polymer lean phase. Such nucleation tendencies are believed to lead to the formation of gaps between the polymer and sieve resulting in poor mixed matrix performance. This research focuses on defining procedures and parameters to form successful mixed matrix hollow fiber membranes. The first part of this dissertation describes dope mixing procedures and unsuccessful results obtained using a silane coupling agent to enhance polymer-zeolite adhesion. The next section follows the development of a highly successful surface modification technique, discovered by the author, employing the use of a Grignard reagent. As a test case, two zeolites of different silicon-to-aluminum ratios are successfully modified and used to develop mixed matrix membranes with greatly increased gas separation efficiencies. The broad applicability of the surface treatment is also demonstrated by the successful incorporation of the modified zeolites in a second polymer matrix. The final section of the work describes the novel occurrence of large defects (macrovoids) caused by the presence of large zeolite particles proposing a particle size effect in the formation of such defects.
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Wu, Zhentao. "Dual-layer functional ceramic hollow fibre membranes for partial oxidation of methane." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/9858.

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Due to the unique mechanism of oxygen permeation through dense ceramic membranes with the mixed ionic-electronic conducting property, these membranes have been widely studied for oxygen separation. It has been several decades since the use of a dense ceramic membrane reactor for methane conversion was proposed. One of the major reasons for persistent worldwide research efforts to develop such dense ceramic membrane reactors is the advantages that result from combining oxygen separation and catalytic reactions within a single unit. Besides the significant progress that has been made to date, more and more effort has been directed towards the development of more stable membrane materials with higher oxygen permeation, more advanced membrane micro-structures, membrane configurations with higher surface area per unit volume and better membrane reactor designs. By improving the aforementioned membrane and membrane reactor properties, lower operating temperatures, longer life time and reduced costs can be achieved. The evolution of membrane reactor designs has progressed through a number of stages, from an initial disk-type design to flat-sheet stack or tubular designs with higher surface areas. It is not until very recently that ceramic hollow fibre membrane with further increased surface area/volume ratios of up to 3000 m2/m3 has been developed. Although there has been a consistent progress in improving membrane configurations, the way that catalyst is employed in a membrane reactor is still based on packing catalyst particles on the membrane or inside the reactor. This occupies a considerable amount of space and as a consequence the actual surface area/volume ratio of a membrane reactor design is significantly lower than that of the membrane itself. In order to develop a highly compact membrane reactor design for partial oxidation of methane (POM) with the maximum possible surface area/volume ratio, this thesis focuses on the development of a functional ceramic hollow fibre membrane with a novel dual-layer structure. The outer layer is designed for oxygen separation while the inner layer can be considered as a catalytic substrate layer. Such dual-layer ceramic hollow fibre membranes can be fabricated by a novel single-step co-extrusion and co-sintering process. This new membrane fabrication process allows for the simultaneous formation of the dual-layer membrane structure with excellent adhesion between the two layers even at high operating temperatures. Moreover, as well as changes in the compositions of the membrane material, aspects of the membrane structure, such as the thickness of the outer oxygen separation layer, can be adjusted during the co-extrusion process, in order to achieve higher oxygen permeation and subsequently better reactor performance. Although the functional dual-layer ceramic hollow fibre membranes discussed in this thesis are designed for POM, there are generic advantages of such membrane structures and the membrane fabrication process. Therefore, membranes of this type can be transferred to other membrane processes of great importance, such as oxygen separation and solid oxide fuel cells (SOFC).
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Boztepe, Inci. "Examination of Hydrophobic/Hydrophilic Dual Layer Membranes for Membrane Distillation." Thesis, 2018. https://vuir.vu.edu.au/40253/.

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Membrane Distillation (MD) is a separation technology that uses a temperature difference across a membrane to purify water. Membrane distillation has been known since the early 1960s and there are still breakthroughs to be made. Improvements in the module design or new membranes materials, such as composite membranes, are being investigated, and much research has focused on these aspects. This study focused on membrane distillation performance for direct contact membrane distillation with 5 different membranes, which included 3 hydrophobic and 2 hydrophobic/hydrophilic dual layer membranes. Their performance was modelled using mathematical modelling program MATLAB. The purpose of the study was to predict the flux and energy efficiency for membranes, and verify with the experimental work. This work extended membrane distillation 1-D modelling to dual layer membranes, which has not previously been performed. The approach of the study required membrane characterization tests to provide input parameters to the model, and also serve as parameters for explaining the flux performance of the membranes. The membrane characteristics measured were porosity, thickness, tortuosity and pore size. Membrane distillation experiments were performed at different feed and cold inlet temperatures and flowrates, and permeate fluxes for various membranes and different operating conditions were measured and analysed. The experimental results were compared with predictions from the mathematical modelling for both the single layer and dual layer membranes, and very good agreements have been found. Error was within 10% for flux and energy efficiencies between the experiments and the model. Single layer membranes’ performances were found better than dual layer membranes. The thickness of the hydrophobic layer was the highest among the other membranes, hence it affected heat and mass transfer across the membrane adversely compared to single layer membranes. Therefore, the permeate flux and energy efficiency was lower for dual layer membrane compared to single layer membranes. Better performance for single layer membranes can be attributed to their characteristics.
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Book chapters on the topic "Dual layer membranes"

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Liu, Mei-Ling, Zheng-Jun Fu, and Shi-Peng Sun. "Hollow fiber spinning of dual-layer membranes." In Hollow Fiber Membranes, 253–74. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-821876-1.00015-9.

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Zuo, Jian, Kang-Jia Lu, and Peng Wang. "Dual-Layer and Multibore Membranes for Membrane Distillation." In Membrane Distillation, 141–66. CRC Press, 2019. http://dx.doi.org/10.1201/9780429287879-6.

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Ong, Yee Kang, and Tai-Shung Chung. "High performance dual-layer hollow fiber fabricated via novel immiscibility-induced phase separation (I2PS) process for dehydration of ethanol." In Hollow Fiber Membranes, 407–30. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-821876-1.00008-1.

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Conference papers on the topic "Dual layer membranes"

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Edwie, Felinia, May May Teoh, and Tai-Shung Chung. "Dual-layer Hydrophobic-hydrophilic PVDF Hollow Fiber Membranes for Continuous Membrane Distillation Operation." In 14th Asia Pacific Confederation of Chemical Engineering Congress. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-1445-1_683.

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Sajidah, Happy Bunga Nasyirahul, Silvana Dwi Nurherdiana, Wahyu Prasetyo Utomo, Rendy Muhamad Iqbal, Djoko Hartanto, Mohd Hafiz Dzarfan Othman, and Hamzah Fansuri. "Preparation and characterization of dual-layer hollow fibre catalyst membrane for oxygen transport." In THE 3RD INTERNATIONAL SEMINAR ON CHEMISTRY: Green Chemistry and its Role for Sustainability. Author(s), 2018. http://dx.doi.org/10.1063/1.5082495.

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Alkarbouly, Sura, and Basma Waisi. "Dual-layer Antifouling Membrane of Electrospun PAN: PMMA Nonwoven Nanofibers for Oily Wastewater Treatment." In Proceedings of 2nd International Multi-Disciplinary Conference Theme: Integrated Sciences and Technologies, IMDC-IST 2021, 7-9 September 2021, Sakarya, Turkey. EAI, 2022. http://dx.doi.org/10.4108/eai.7-9-2021.2314932.

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Wöhner, Timo, Ben R. Whiteside, Guido Tosello, Hans Nørgaard Hansen, and Aminul Islam. "Influence of Process Temperatures on Blister Creation in Micro Film Insert Molding of a Dual Layer Membrane." In 4M/IWMF2016 The Global Conference on Micro Manufacture : Incorporating the 11th International Conference on Multi-Material Micro Manufacture (4M) and the 10th International Workshop on Microfactories (IWMF). Singapore: Research Publishing Services, 2016. http://dx.doi.org/10.3850/978-981-11-0749-8_715.

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