Layer-by-Layer Assembly Modulated by Host–Guest Binding

Pramanik, Nabendu B.; Tian, Chengshuo; Stedronsky, Erwin R.; Regen, Steven L.

doi:10.1021/acsapm.8b00219

Cited by 9 publications

(11 citation statements)

References 26 publications

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“…When one bilayer of PSS/PDDA is deposited onto 30-μm-thick PTMSP that has been surface treated with branched poly(ethylenimine), the permeances of H 2 , CO 2 , and N 2 are only slightly lower than those measured in the absence of this bilayer ( Table 1 ). 16 While a slight increase in the H 2 /N 2 selectivity is apparent, the CO 2 /N 2 selectivity is essentially unchanged. The incremental addition of PSS/PDDA bilayers then leads to a steady decrease in permeance and a corresponding increase in permeation selectivity.…”

Section: Two Recent Developmentsmentioning

confidence: 98%

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Creating Hyperthin Membranes for Gas Separations

Regen

2022

Langmuir

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Interest in creating membranes that can separate gases has intensified in recent years owing, in large part, to climate change. Specifically, the need for separating CO 2 and N 2 from flue gas in an economically viable fashion is now considered urgent. This Perspective highlights two recent developments from my laboratory—defect repair of polyelectrolyte multilayers (PEMs) using micellar solutions of sodium dodecyl sulfate (SDS) and the surface modification of a highly permeable polymer, poly[1-(trimethylsilyl) propyne] (PTMSP)—which I believe have significant implications not only for this CO 2 /N 2 problem but also for the ever-growing area of layer-by-layer (LbL) thin films. A brief mention is also made of past efforts that have been aimed at creating hyperthin membranes from porous surfactants and from PEMs with a view toward gas separations.

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Section: Two Recent Developmentsmentioning

confidence: 98%

“…A consequence of such defects can be seen from the permeation properties of hyperthin PEMs that have been made from two of the most commonly used polyelectrolytes, i.e., poly(sodium 4-styrenesulfonate) (PSS) and poly(diallyldimethylammonium chloride) (PDDA). 16 …”

Section: Two Recent Developmentsmentioning

confidence: 99%

Creating Hyperthin Membranes for Gas Separations

Regen

2022

Langmuir

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“…To test this concept, we fabricated polyelectrolyte multilayers using PSS and PDDA as the polyelectrolytes and β‐cyclodextrin (βCD) as the host molecule . Previously, it was shown that βCD acts as an effective host molecule for the aromatic moieties in PSS.…”

Section: Hyperthin Polyelectrolyte Multilayers For Gas Separationsmentioning

confidence: 99%

“…To test this concept, we fabricated polyelectrolyte multilayers using PSS and PDDA as the polyelectrolytes and βcyclodextrin (βCD) as the host molecule. [49] Previously, it was shown that βCD acts as an effective host molecule for the aromatic moieties in PSS. [50] Thus, we fabricated PEMs using aqueous solutions of PSS-βCD and PDDA and compared them with analogous membranes made in the absence of βCD.…”

Section: P E R S O N a L A C C O U N T T H E C H E M I C A L R E C O R Dmentioning

confidence: 99%

Hyperthin Membranes for Gas Separations via Layer‐by‐Layer Assembly

Pramanik

Regen

2019

The Chemical Record

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Thin film formation via the Layer‐by‐Layer method is now a well‐established and broadly used method in materials science. We have been keenly interested in exploiting this technique in the area of gas separations. Specifically, we have sought to create hyperthin (<100 nm) polyelectrolyte‐based membranes that have practical potential for the separation of CO2 from N2 (flue gas) and H2 from CO2 (syngas). In this personal account, we summarize recent studies that have been aimed at measuring the influence of a variety of factors that can affect the permeability and permeation selectivity of hyperthin polyelectrolyte multilayers (PEMs).

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“…The layer-by-layer (LbL) deposition method is now widely used to synthesize polyelectrolyte multilayers (PEMs) that are of theoretical as well as practical interest. − Our own interest in PEMs stems from their possible use as membranes for the separation of gases, especially CO 2 from N 2 , which are the major components of flue gas. − Because the flux of a gas across a membrane is inversely proportional to the membrane’s thickness, we have been keenly interested in creating the thinnest PEMs possible, having CO 2 /N 2 selectivities that are potentially exploitable, i.e., single polyelectrolyte bilayers having selectivities >20 and the highest permeability possible with respect to CO 2 …”

Section: Introductionmentioning

confidence: 99%

Defect Repair of Polyelectrolyte Bilayers Using SDS: The Action of Micelles Versus Monomers

2021

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Defects within single, double, and triple polyelectrolyte bilayers derived from poly(sodium 4-styrenesulfonate) (PSS) and poly(diallyldimethyammonium chloride) (PDDA) have been repaired using aqueous solutions of sodium dodecyl sulfate (SDS), as evidenced by a reduction in their permeability and an increase in their permeation selectivity. In contrast to the use of monomer solutions of SDS, which were moderately effective in repairing only double and triple bilayers, micellar solutions proved highly effective for all three assemblies. Evidence for intact micelles or micellar fragments being deposited on the surface of single bilayers of PSS/PDDA has been obtained from a combination of atomic force microscopy, X-ray photoelectron spectroscopy, ellipsometry, and contact angle measurements. Observed CO 2 permeances of ca. 200 GPU and CO 2 /N 2 selectivities of ca. 30 for SDS-repaired, single bilayers of PSS/PDDA suggest that further development of such assemblies could have the practical potential for the separation of CO 2 from N 2 in the flue gas.

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Layer-by-Layer Assembly Modulated by Host–Guest Binding

Cited by 9 publications

References 26 publications

Creating Hyperthin Membranes for Gas Separations

Creating Hyperthin Membranes for Gas Separations

Hyperthin Membranes for Gas Separations via Layer‐by‐Layer Assembly

Defect Repair of Polyelectrolyte Bilayers Using SDS: The Action of Micelles Versus Monomers

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