Ultrathin, Multilayered Polyelectrolyte Films as Nanofiltration Membranes

Stanton, Brian W.; Harris, Jeremy J.; Miller, and Matthew D.; Bruening, Merlin L.

doi:10.1021/la034603a

Cited by 256 publications

(259 citation statements)

References 56 publications

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“…Selective ion transport has been observed and studied by Tieke, Schlenoff, and Bruening, with observations suggesting that highly specific ion separations can be achieved in these films based on charge and size of ion. [10,11,15,16] The presence of fixed charges at the surface of the multilayers results in Donnan exclusion of multivalent ions, resulting in the preferential transport of small monovalent ions. [17] Stanton et al have reported significant selectivities between Cl ± /SO 4 2± in SPS/PAH films as high as 80.…”

Section: Sensors and Perm-selective Thin Filmsmentioning

confidence: 99%

“…[17] Stanton et al have reported significant selectivities between Cl ± /SO 4 2± in SPS/PAH films as high as 80. [15] These kinds of numbers make polyelectrolyte multilayers interesting for water desalination, heavy metal ion separations, and other applications. In general, the balance of extrinsic charge due to counterions and intrinsic charge coupled between polymer segments has been observed to yield hydrophobic multilayers such as SPS/PDAC (poly(diallylmethylammonium chloride)), which act as ªreluctant ion exchangersº [16] and require doping of salts to enhance the flux of ions through the membrane.…”

Section: Sensors and Perm-selective Thin Filmsmentioning

confidence: 99%

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Form and Function in Multilayer Assembly: New Applications at the Nanoscale

Hammond¹

2004

Advanced Materials

1,191

1,005

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New frontiers in materials and polymer science include the development of assembly processes that are flexible, allow the access and implementation of nanoscale structure and order, can provide access to a broad range of materials systems, and yet can be implemented at relatively low cost. The ability to fine tune the composition of nanostructured thin films on the nanometer length scale, when combined with inexpensive patterning and templating routes, provides a powerful tool for nano‐ and microscale assembly of devices and novel new material systems. The layer‐by‐layer electrostatic assembly technique is a rich, versatile, and significantly inexpensive approach to the formation of thin films via alternating adsorption of positively and negatively charged species from aqueous solutions; this method has also been extended to include the alternation of polymers with hydrogen‐bond donor and acceptor groups. Polymer organic and organic/inorganic thin films formed using this technique may contain a number of different functional groups, including electro‐optic, electroluminescent, conducting, and dielectric layers, and functional organic and inorganic nanoparticles. Newly developed materials systems based on alternating layer methods will be addressed, as well as a number of frontier areas and future areas for the use of these systems, ranging from nanomechanical composites to electrochemical devices and templated deposition of functional microspheres. Both new functionalities incorporated within these materials and new means of patterning and templating these structures in two and three dimensions will be addressed in this review.

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Section: Sensors and Perm-selective Thin Filmsmentioning

confidence: 99%

Section: Sensors and Perm-selective Thin Filmsmentioning

confidence: 99%

Form and Function in Multilayer Assembly: New Applications at the Nanoscale

Hammond¹

2004

Advanced Materials

1,191

1,005

View full text Add to dashboard Cite

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“…As a result, the process of relying on the older methodologies for RO or NF membrane preparation is a sensible and practical direction. Forthcoming research may expand the recently developed techniques for the production of high-performance FO membranes, including layer-by-layer assembly [103,[105][106][107][108][109][110][111][112], UV-photographing [113][114][115][116], and polyelectrolyte dip-coating [117,118]. In addition, membranes featuring polyelectrolyte multilayers, charged properties, or double selective layers can provide exciting avenues for specific real-life FO applications.…”

Section: Chemically Modified Membranesmentioning

confidence: 99%

Fouling in Forward Osmosis Membranes: Mechanisms, Control, and Challenges

Abdelrasoul¹,

Doan²,

Lohi³

et al. 2018

Osmotically Driven Membrane Processes - Approach, Development and Current Status

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Continuously escalating global water demand places a substantial burden on the available water and energy resources. Forward osmosis (FO) is an evolving membrane desalination technology that has recently raised interest as a promising low-energy process. FO is a unique method since it utilizes natural osmosis as the driving force, and hence, it ensures that the energy consumption is significantly reduced, in comparison to other pressuredriven membrane processes that are constrained by their excessive energy consumption and unsustainable cost. Therefore, the growing interest in FO from various disciplines and industrial sectors calls for a better understanding of the FO process and further advances in the FO technology management. This chapter aims to provide an in-depth assessment of the water transport phenomenon in FO membranes by focusing on the influence of internal concentration polarization, membrane structure/material, and membrane orientation on the permeate flux. This chapter offers critical insight that can lead to the potential development of new FO membranes with reduced internal concentration polarization and higher water permeability. In addition, key strategies for FO membrane development, some of its challenges, and the perspectives for future investigations of FO membrane fouling and effective FO fouling control methods are explored in this chapter.

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“…PEM's can provide membranes with antifouling functionalities [11,12,[14][15][16][17][18], as well as act as the separation (skin) layer for NF membranes [19]. Most of the previous studies on PEM based NF membranes, utilized flat sheet membrane supports as reported for example by Bruening et al [20][21][22][23][24][25] and Tieke et al [26,27]. However, the hollow fiber configuration would offer a higher productivity [28,29].…”

Section: Introductionmentioning

confidence: 99%

Preparation of multifunctional hollow fiber nanofiltration membranes by dynamic assembly of weak polyelectrolyte multilayers

Ilyas

English

Aimar

et al. 2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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A B S T R A C TIn this work, we investigate the effect of preparation conditions for dynamic layer-by-layer (LbL) coating, to prepare multifunctional hollow fiber nanofiltration (NF) membranes. Dynamic coating was performed at constant pressure and at variable cross flow speeds. In this way, polyelectrolyte multilayers (PEMs) were formed of the weak polyelectrolytes poly(acrylic acid) (PAA) and poly(allylamine hydrochloride) (PAH), on a negatively charged polyethersulfone ultrafiltration (UF) support. The resulting membrane performance was investigated and compared to membranes prepared by different methods (dip coating and dead end filtration), and it was found to be comparable. It was shown that PAH/ PAA multilayers can be fabricated reproducibly and homogenously using optimised dynamic LbL deposition conditions on single fiber module (surface area of 6.2 cm 2 ) as well as on a module of 15 fibers (surface area of 67 cm 2 ). Moreover, the approach of dynamic coating could be easily up scaled to coat existing UF modules. The prepared membranes reject the solutes on the basis of size exclusion and Donnan exclusion, retaining small organic solutes and divalent ions. Membranes terminated with PAA exhibit a low fouling tendency compared to membranes terminated with PAH and compared to the UF support membrane. Moreover, if severe membrane fouling would occur after prolonged use, the PEM coating, including any attached foulants can be removed by rinsing with a solution that combines a low pH and a high salinity (pH 3, 3 M). The surface of bovine serum albumin (BSA) fouled membranes were successfully cleaned at least twice, after which a new PEM coating could be re-applied by active coating.

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Ultrathin, Multilayered Polyelectrolyte Films as Nanofiltration Membranes

Cited by 256 publications

References 56 publications

Form and Function in Multilayer Assembly: New Applications at the Nanoscale

Form and Function in Multilayer Assembly: New Applications at the Nanoscale

Fouling in Forward Osmosis Membranes: Mechanisms, Control, and Challenges

Preparation of multifunctional hollow fiber nanofiltration membranes by dynamic assembly of weak polyelectrolyte multilayers

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