Recent developments in the properties and applications of polyelectrolyte multilayers

Jaber, Jad A.; Schlenoff, Joseph B.

doi:10.1016/j.cocis.2006.09.008

Cited by 116 publications

(108 citation statements)

References 60 publications

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“…The research carried out on superhydrophobic surfaces and the related phenomena dates back to approximately the beginning of the last century [17,83,[97][98][99][100][101]. In 1907, Ollivier [83,102,103] observed that contact angles of nearly 180° appeared on surfaces coated with soot, arsenic trioxide, and lycopodium powder.…”

Section: Superhydrophobic Surfacesmentioning

confidence: 99%

Preventing corrosion and ice accretion on aluminium surfaces applying organic and inorganic thin films /

Farhadi¹

2010

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Ice and wet-snow accretion on outdoor structures, including power transmission and distribution equipment, is a serious problem for regions experiencing icing conditions.Various de-icing and anti-icing techniques have been developed to date to counter this problem. Most of the techniques currently in use, however, including active de-icing methods, are employed only where accumulations are substantial. Passive approaches to the problem such as anti-icing or icephobic coatings which inhibit or retard ice accumulation on the surfaces are gaining in popularity.Metal corrosion should also be taken into account since metal or metallic alloys are subject to corrosion problems when placed in a humid or aggressive environment; the development of any ice-releasing coatings on Al structures, as they must be durable enough, is thus closely related to anti-corrosive protection of that specific metal.Consequently, this research has made an attempt to prepare coatings, either one layer or multi-layer, for use on polished AA6061 and AA2024 substrates combining the qualities of reduced ice adhesion and improved corrosion resistance. These two alloys are among the most widely used aluminium alloys in transportation systems (including aircraft), electric power industry, military, etc. Both the stability of the coatings in a humid environment and their overall ice-repellent performance was systematically studied.This research work has made a systematic approach to investigating the influence of surface roughness on the ice-releasing potential and the hydrophobic properties of the prepared coating surfaces. All coatings displayed a gradual loss of their hydrophobic properties after ~ 1000 h of immersion in water, and while corrosion of surfaces was also observed, except in the case of surfaces treated with permanganate conversion coatings which provided satisfactory anti-corrosive protection. IllAll flat coated surfaces demonstrated shear stress of ice detachment values which were at least ~ 1.5 times lower than uncoated mirror-polished Al surfaces and about ~ 2 times lower than those observed on as-received Al surfaces. The adhesion reduction factor (ARF) values decreased after as many as 12 icing/de-icing events, implying a certain amount of decay of the coatings.All rough superhydrophobic samples allowed for ice adhesion shear stress values of at least ~ 4 to 7 times lower than those obtained on the uncoated as-received Al surfaces. After 24 icing/de-icing experiments, however, ice adhesion strength increased significantly on those surfaces by a factor of ~ 2 after 24 icing/de-icing cycles.In addition, all flat and rough-coated surfaces gradually lost their hydrophobic properties after nearly each icing/de-icing cycle. Thus, the ice-releasing ability of all samples tested was found to be time-dependent.The work thus reveals that it is possible to prepare coatings which provide the reduced adhesion of ice to Al surfaces, while at the same time also providing some degree of anticorrosive protection.

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Section: Superhydrophobic Surfacesmentioning

confidence: 99%

Preventing corrosion and ice accretion on aluminium surfaces applying organic and inorganic thin films /

Farhadi¹

2010

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“…[20][21][22][23][24][25][26] PEM coatings are widely applicable in medicine, sensing, molecular electronics, and surface modifications. [27][28][29][30][31][32][33][34][35][36][37][38][39][40] Constructing PEMs on patterned substrates opens another dimension in LbL construction, which may be useful for applications that require lateral structuring or high surface area (e.g., photonics, catalysis, controlled release, and membranes). Hammond et al studied the deposition of PEs on micron-scale patterns prepared by micro-contact printing.…”

Section: Introductionmentioning

confidence: 99%

From dots to doughnuts: Two-dimensionally confined deposition of polyelectrolytes on block copolymer templates

Oded

Kelly

Gilles

et al. 2016

Polymer

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The combination of block copolymer templating with electrostatic self-assembly provides a simple and robust method for creating nano-patterned polyelectrolyte multilayers over large areas. Understanding the deposition of the first polyelectrolyte layer is crucial for achieving successful buildup of patterned multilayers. Here, we focus on two-dimensionally confined "dots" patterns afforded by block copolymer films featuring hexagonally-packed cylinders that are oriented normal to the substrate. Rendering the cylinder caps positively charged enables the selective deposition of negatively charged polyelectrolytes on them under salt-free conditions.The initially formed polyelectrolyte nanostructures adopt a toroidal ("doughnut") shape, which results from retraction of dangling polyelectrolyte segments into the "dots" upon drying. With increasing exposure time to the polyelectrolyte solution, the final shape of the deposited polyelectrolyte transitions from a doughnut to a hemisphere. These insights would enable the creation of patterned polyelectrolyte multilayers with increased control over adsorption selectivity of the additional incoming polyelectrolytes.

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“…At each stage of the deposition, the charge of the polyelectrolyte used is opposite to that in the previous stage (Jaber & Schlenoff, 2006;Schonhoff, 2003). The procedure has come to be known as the layer-by-layer (LbL) deposition technique.…”

Section: Introductionmentioning

confidence: 99%

Colloidal interactions induced by overlap of mixed protein+polysaccharide interfacial layers

Ettelaie

Akinshina

2014

Food Hydrocolloids

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Colloidal interaction potentials induced by the overlap of mixed protein + polysaccharide interfacial layers, formed solely as a result of electrostatic attraction between these two biopolymers, have been calculated using the Self Consistent Field Theory. A significant difference between the nature and magnitude of these interactions, depending on the manner in which the charge is distributed along the length of the polysaccharide molecules, was predicted. For chains with an even distribution of charge, the repulsive interactions are in general weaker than those mediated by pure protein layers. For strongly charged polysaccharide chains, these become even attractive at a certain range of particle-particle separations. In part this is due to bridging by polysaccharides, occurring between opposite layers. However, in systems containing strongly charged polyelectrolyte, it is also the result of what in practice may be interpreted as a coacervate of protein + polysaccharide, with a tendency for aggregation, forming interfacial layers on the surface of the particles. In contrast, when the charge of the polysaccharide chains is unevenly distributed, the induced repulsive forces are much enhanced and become longer ranged compared to those for pure protein layers. Once the layers begin to overlap, the electro-steric interactions produced are found to completely overwhelm any van der Waals attraction, thus dictating the inter-particle interactions. We also present some preliminary calculations investigating the competitive adsorption of different polysaccharides onto the protein layer. The initial results, for polysaccharides of the same size and overall charge, suggest that the heterogeneously charged polyelectrolyte completely dominates the adsorption onto the surface, displacing all uniformly charged chains from the interface.

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Recent developments in the properties and applications of polyelectrolyte multilayers

Cited by 116 publications

References 60 publications

Preventing corrosion and ice accretion on aluminium surfaces applying organic and inorganic thin films /

Preventing corrosion and ice accretion on aluminium surfaces applying organic and inorganic thin films /

From dots to doughnuts: Two-dimensionally confined deposition of polyelectrolytes on block copolymer templates

Colloidal interactions induced by overlap of mixed protein+polysaccharide interfacial layers

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