Layer-by-layer assembled membranes with immobilized porins

Hernández, Sebastián; Porter, Cassandra J.; Zhang, Xinyi; Wei, Yinan; Bhattacharyya, Dibakar

doi:10.1039/c7ra08737c

Cited by 18 publications

(20 citation statements)

References 78 publications

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“…Polyethylene glycol (PEG) with molecular weight from 200, 400, 1000, 4000, 10,000, 20,000, 40 kDa were used as feed to determine MWCO values for the different membranes. Since PEGs are linear polymers, the regression model of hydrodynamic radius (nm) and molecular weight (kDa) is given by Equation (4) [ 68 ]: r H = 0.06127 (MW) 0.3931 …”

Section: Methodsmentioning

confidence: 99%

Investigation of the Use of a Bio-Derived Solvent for Non-Solvent-Induced Phase Separation (NIPS) Fabrication of Polysulfone Membranes

2018

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Organic solvents, such as N-methyl-2-pyrrolidone (NMP) and dimethylacetamide (DMAc), have been traditionally used to fabricate polymeric membranes. These solvents may have a negative impact on the environment and human health; therefore, using renewable solvents derived from biomass is of great interest to make membrane fabrication sustainable. Methyl-5-(dimethylamino)-2-methyl-5-oxopentanoate (Rhodiasolv PolarClean) is a bio-derived, biodegradable, nonflammable and nonvolatile solvent. Polysulfone is a commonly used polymer to fabricate membranes due to its thermal stability, strong mechanical strength and good chemical resistance. From cloud point curves, PolarClean showed potential to be a solvent for polysulfone. Membranes prepared with PolarClean were investigated in terms of their morphology, porosity, water permeability and protein rejection, and were compared to membranes prepared with traditional solvents. The pores of polysulfone/PolarClean membranes were sponge-like, and the membranes displayed higher water flux values (176.0 ± 8.8 LMH) along with slightly higher solute rejection (99.0 ± 0.51%). On the other hand, PSf/DMAc membrane pores were finger-like with lower water flux (63.1 ± 12.4 LMH) and slightly lower solute rejection (96 ± 2.00%) when compared to PSf/PolarClean membranes.

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Section: Methodsmentioning

confidence: 99%

Investigation of the Use of a Bio-Derived Solvent for Non-Solvent-Induced Phase Separation (NIPS) Fabrication of Polysulfone Membranes

2018

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“…used a layer‐by‐layer approach to incorporate OmpF or porins from E. coli into poly (vinylidene fluoride) (PVDF) microfiltration membranes. These membranes provided a rejection of 84% for 0.4 to 1.0 kDa organic molecules and a pH‐dependent salt rejection . Some examples of incorporation of membrane proteins into synthetic systems are listed in Table .…”

Section: Incorporation Of Diffusion Channels Into Synthetic Systemsmentioning

confidence: 99%

“…These proteins can be exploited to synthesize artificial systems for various applications such as voltage gating, pH‐dependent rejections, specific molecular weight cutoff, ion transport, and so forth. . There are some limitations involved in incorporation strategies such as functionality of these proteins, similarity of synthetic system with the natural environment of lipid bilayer in the cell membrane .…”

Section: Incorporation Of Diffusion Channels Into Synthetic Systemsmentioning

confidence: 99%

Biomimetic and bioinspired membranes for water purification: A critical review and future directions

Wagh

Escobar

2019

Env Prog and Sustain Energy

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Various types of channel proteins, broadly named porins, present in the cell membrane of gram‐negative bacteria have specific functionalities depending on their selectivity toward different nutrients or toward water. The high selectivity of porins has led to their incorporation into synthetic systems, in a field called biomimetics. An example is the addition of water channel proteins, or aquaporins, to polymeric separations membranes in order to enhance their performance in terms of selectivity and permeability. The concept of incorporating aquaporins into synthetic membranes has been studied for the last 10 years; however, there are still limitations such as costs, alignment into the membrane assembly, and scalability of membrane fabrication. Therefore, in recent years, there has been an increase in the study of synthesizing molecules with similar structure–function relationships of porins. These artificial channels attempt to mimic the biological porins, while being synthesized using simpler chemistry, being solvent compatible, and requiring less space on the membrane surface which helps to incorporate more channels into the membrane assembly. In summary, the future of biomimetic and bioinspired membranes depends on the design strategies, level of nature imitation, and the performance of these systems on a commercial scale. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13215, 2019

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“…The various samples that were used in this study along with their Stokes-Einstein radii are shown in Table I, where the Stokes-Einstein radii were obtained from literature studies using dynamic slight scattering. [35][36][37][38][39] The rejection values of all solutes were used to determine the MWCO of both unmodified and modified PBI membranes. The molecular weight of solute in feed solution for which the membranes showed more than 90% rejection was considered the MWCO of the membranes.…”

Section: Molecular Weight Cutoffmentioning

confidence: 99%

“…Neutral Solutes Used for MWCO Analysis and their Stokes-Einstein Radii in nm, According to Literature Studies[35][36][37][38][39] …”

mentioning

confidence: 99%

Membrane functionalization using bisamide‐based organic frameworks for molecular weight cutoff reduction

Wagh

Spencer

Steele

et al. 2019

J of Applied Polymer Sci

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Functional polymers or copolymers have been added to separations membranes by incorporating them in the membrane dope prior to casting, by in situ polymerization, and by postsynthesis surface modification of existing membranes. Here, a postsynthesis membrane functionalization that targeted decreasing the molecular weight cutoff (MWCO) and increasing the hydrophilicity without significantly decreasing the operating flux was studied. Hybrid bisamide molecules with added amine and carboxylic acid functionalities as end groups were synthesized to form a selective layer on membrane surface via covalent attachment to the membrane. Fourier transform infrared spectroscopy analysis showed the functional groups corresponding to bisamide molecules were present on modified membranes. Furthermore, modified membranes displayed MWCO of 400 Da as compared to 1000 Da MWCO of unmodified membranes, along with an increase in the hydrophilicity of modified membranes. Modified membranes showed an improvement in divalent salt rejection and percent flux recovered after reverse-flow filtration as compared to unmodified membranes.

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Layer-by-layer assembled membranes with immobilized porins

Cited by 18 publications

References 78 publications

Investigation of the Use of a Bio-Derived Solvent for Non-Solvent-Induced Phase Separation (NIPS) Fabrication of Polysulfone Membranes

Investigation of the Use of a Bio-Derived Solvent for Non-Solvent-Induced Phase Separation (NIPS) Fabrication of Polysulfone Membranes

Biomimetic and bioinspired membranes for water purification: A critical review and future directions

Membrane functionalization using bisamide‐based organic frameworks for molecular weight cutoff reduction

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