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Zhang Z, Simon A, Abetz C, Held M, Höhme AL, Schneider ES, Segal-Peretz T, Abetz V. Hybrid Organic-Inorganic-Organic Isoporous Membranes with Tunable Pore Sizes and Functionalities for Molecular Separation. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2105251. [PMID: 34580938 DOI: 10.1002/adma.202105251] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 08/28/2021] [Indexed: 05/26/2023]
Abstract
Accomplishing on-demand molecular separation with a high selectivity and good permeability is very desirable for pollutant removal and chemical and pharmaceutical processing. The major challenge for sub-10 nm filtration of particles and molecules is the fabrication of high-performance membranes with tunable pore size and designed functionality. Here, a versatile top-down approach is demonstrated to produce such a membrane using isoporous block copolymer membranes with well-defined pore sizes combined with growth of metal oxide using sequential infiltration synthesis and atomic layer deposition (SIS and ALD). The pore size of the membranes is tuned by controlled metal oxide growth within and onto the polymer channels, enabling up to twofold pore diameter reduction. Following the growth, the distinct functionalities are readily incorporated along the membrane nanochannels with either hydrophobic, cationic, or anionic groups via straightforward and scalable gas/liquid-solid interface reactions. The hydrophilicity/hydrophobicity of the membrane nanochannel is significantly changed by the introduction of hydrophilic metal oxide and hydrophobic fluorinated groups. The functionalized membranes exhibit a superior selectivity and permeability in separating 1-2 nm organic molecules and fractionating similar-sized proteins based on size, charge, and hydrophobicity. This demonstrates the great potential of organic-inorganic-organic isoporous membranes for high-performance molecular separation in numerous applications.
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Affiliation(s)
- Zhenzhen Zhang
- Helmholtz-Zentrum Hereon, Institute of Membrane Research, Max-Planck-Str. 1, 21502, Geesthacht, Germany
| | - Assaf Simon
- Department of Chemical Engineering, Technion- Israel Institute of Technology, Haifa, 3200003, Israel
| | - Clarissa Abetz
- Helmholtz-Zentrum Hereon, Institute of Membrane Research, Max-Planck-Str. 1, 21502, Geesthacht, Germany
| | - Martin Held
- Helmholtz-Zentrum Hereon, Institute of Membrane Research, Max-Planck-Str. 1, 21502, Geesthacht, Germany
| | - Anke-Lisa Höhme
- Helmholtz-Zentrum Hereon, Institute of Membrane Research, Max-Planck-Str. 1, 21502, Geesthacht, Germany
| | - Erik S Schneider
- Helmholtz-Zentrum Hereon, Institute of Membrane Research, Max-Planck-Str. 1, 21502, Geesthacht, Germany
| | - Tamar Segal-Peretz
- Department of Chemical Engineering, Technion- Israel Institute of Technology, Haifa, 3200003, Israel
| | - Volker Abetz
- Helmholtz-Zentrum Hereon, Institute of Membrane Research, Max-Planck-Str. 1, 21502, Geesthacht, Germany
- Universität Hamburg, Institute of Physical Chemistry, Martin-Luther-King-Platz 6, 20146, Hamburg, Germany
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Zhong D, Zhou J, Wang Y. Hollow-fiber membranes of block copolymers by melt spinning and selective swelling. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2021.119374] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Zhang X, Sun G, Liu H, Zhang X. Fabrication of porous polymer coating layers with selective wettability on filter papers via the breath figure method and their applications in oil/water separation. RSC Adv 2021; 11:14276-14284. [PMID: 35423976 PMCID: PMC8697688 DOI: 10.1039/d1ra01080h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 03/28/2021] [Indexed: 11/21/2022] Open
Abstract
A comb-like amphiphilic polymer (PBTF), composed of hydrophobic backbones and hydrophilic side chains, was employed to grow honeycomb coating layers in situ on a filter paper via directly casting a polymer solution and by the subsequent dynamic breath figure (BF) method. Through regulating the hydrophilic polymer side chain density and the solution concentration, a continuous honeycomb coating layer contouring to the filter paper surface profile, in addition to possessing a water contact angle (WCA) as high as 146°, was successfully fabricated. The present study also finds that increasing the hydrophilic side chain density will turn PBTF into a surfactant-like polymer, and thus, endow the PBTF solution with the capacity of numerous micro-nano-sized water droplets, rather than simply stabilizing the ordered water droplet arrays on the surface of the solution. With vast nano-sized water droplets in it, the once transparent PBTF solution changed into a translucent nano-emulsion, which demonstrates a strong Tyndall effect. While casting such nano-emulsion on a filter paper and then subjecting to the BF process, the polymeric solute takes both nano-emulsion intrinsic nano-sized water droplets and solvent evaporation-induced water droplets as templates and self-assembles into a bird-nest-like three-dimensional porous microstructure, which possesses micro-nano-sized communicating pores. By regulating the water content in the nano-emulsion, the bird-nest-like structure can be uniformly formed on the surface of the filter paper, which revealed a WCA of 152°. The coated filter papers possess selective wettability, and meanwhile, maintain the inherent permeability of the substrates, which therefore can be directly utilized as oil/water separation materials.
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Affiliation(s)
- Xu Zhang
- College of Materials Science and Engineering, Jilin University Changchun 130022 People's Republic of China
- College of Materials Science and Engineering, Jilin Jianzhu University Changchun 130118 People's Republic of China
| | - Guangping Sun
- College of Materials Science and Engineering, Jilin University Changchun 130022 People's Republic of China
| | - Heng Liu
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology Qingdao 266061 People's Republic of China
| | - Xuequan Zhang
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology Qingdao 266061 People's Republic of China
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Defect-free outer-selective hollow fiber thin-film composite membranes for forward osmosis applications. J Memb Sci 2019. [DOI: 10.1016/j.memsci.2019.05.064] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Hollow Fiber Membranes of Blends of Polyethersulfone and Sulfonated Polymers. MEMBRANES 2018; 8:membranes8030054. [PMID: 30072657 PMCID: PMC6161186 DOI: 10.3390/membranes8030054] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/09/2018] [Revised: 07/30/2018] [Accepted: 07/31/2018] [Indexed: 11/17/2022]
Abstract
Hollow fiber membranes (HFM) are fabricated from blend solutions of a polyethersulfone (PESU) with a sulfonated PESU (sPESU) or a sulfonated polyphenylenesulfone (sPPSU). The influence of different additives in the dope solution and different bore fluids on the HFM are studied. The addition of poly(sodium 4-styrene sulfonate) (PSSNa)/ethylene glycol (EG) to the dope solution results in an increased water flux of the HFM compared to its counterparts without this additive system. The morphology of the hollow fibers is examined by scanning electron microscopy (SEM). The inner surface of the hollow fibers is studied by X-ray photoelectron spectroscopy (XPS), and it is found that water permeation through the hollow fiber membranes is facilitated due to the change in morphology upon the addition of the PSSNa/EG additive system, but not by the presence of hydrophilic sulfonic acid groups on the membrane surface.
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Dyett B, Kiyama A, Rump M, Tagawa Y, Lohse D, Zhang X. Growth dynamics of surface nanodroplets during solvent exchange at varying flow rates. SOFT MATTER 2018; 14:5197-5204. [PMID: 29780988 DOI: 10.1039/c8sm00705e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Solvent exchange is a simple solution-based process to produce surface nanodroplets over a large area. The final size of the droplets is determined by both the flow and solution conditions for a given substrate. In this work, we investigate the growth dynamics of surface nanodroplets during solvent exchange by using total internal reflection fluorescence microscopy (TIRF). The results show that during the solvent exchange, the formation of surface nanodroplets advanced on the surface in the direction of the flow. The time for the number density and surface coverage of the droplets to reach their respective plateau values is determined by the flow rate. From the observed evolution of the droplet volume and of the size of individual growing droplets, we are able to determine that the growth time of the droplets scales with the Peclet number Pe with a power law ∝Pe-1/2. This is consistent with Taylor-Aris dispersion, shedding light on the diffusive growth dynamics during the solvent exchange. Further, the spatial rearrangement of the droplets during coalescence demonstrates a preference in position shift based on size inequality, namely, the coalesced droplet resides closer to the larger of the two parent droplets. These findings provide a valuable insight toward controlling droplet size and spatial distribution.
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Affiliation(s)
- Brendan Dyett
- Soft Matter & Interfaces Group, School of Engineering, RMIT University, Melbourne, VIC 3001, Australia.
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Ruan X, Zhang K, Jiang X, Zhang X, Yan X, Zhang N, He G. Facile fabrication of reinforced homoporous MF membranes by in situ breath figure and thermal adhesion method on substrates. J Memb Sci 2018. [DOI: 10.1016/j.memsci.2018.03.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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