Salt-Induced Polyelectrolyte Interdiffusion in Multilayered Films:  A Neutron Reflectivity Study

Jomaa, Houssam W.; Schlenoff, Joseph B.

doi:10.1021/ma050072g

Cited by 195 publications

(280 citation statements)

References 54 publications

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“…At the same time, the ion doping [65] of the film increases and the stratification of the layers progressively disappears [66], making such films close to those obtained during an exponential growth regime.…”

Section: Selected Properties Of Films Produced In a Sbs Mannersupporting

confidence: 60%

Deposition Mechanisms in Layer-by-Layer or Step-by-Step Deposition Methods: From Elastic and Impermeable Films to Soft Membranes with Ion Exchange Properties

Michel¹,

Toniazzo²,

Ruch³

et al. 2012

ISRN Materials Science

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The modification of solid-liquid interfaces with polyelectrolyte multilayer films appears as a versatile tool to confer new functionalities to surfaces in environmentally friendly conditions. Indeed such films are deposited by alternate dipping of the substrates in aqueous solutions containing the interacting species or spraying these solutions on the surface of the substrate. Spin coating is more and more used to produce similar films. The aim of this short review article is to provide an unifying picture about the deposition mechanisms of polyelectrolyte multilayer films. Often those films are described as growing either in a linear or in a supralinear growth regime with the number of deposited "layer pairs". The growth regime of PEM films can be controlled by operational parameters like the temperature or the ionic strength of the used solutions. The control over the growth regime of the films as a function of the number of deposition steps allows to control their functional properties: either hard and impermeable films in the case of linear growth or soft and permeable films in the case of supralinear growth. Such different properties can be obtained with a given combination of interacting species by changing the operational parameters during the film deposition.

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Section: Selected Properties Of Films Produced In a Sbs Mannersupporting

confidence: 60%

Deposition Mechanisms in Layer-by-Layer or Step-by-Step Deposition Methods: From Elastic and Impermeable Films to Soft Membranes with Ion Exchange Properties

Michel¹,

Toniazzo²,

Ruch³

et al. 2012

ISRN Materials Science

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show abstract

“…ment with 0.5 mol/L NaCl solution. The reason is that the increasing ionic strength of the system could lead to the salt swelling and partially decomposition of the multilayer films [16,19,20]. The changes of multilayer film with the salt post-treatment are presented in Scheme 1.…”

Section: Effects Of Different Post-treatment Conditionmentioning

confidence: 99%

The salt-, pH- and oxidant-responsive pervaporation behaviors of weak polyelectrolyte multilayer membranes

Wang

Zhang

et al. 2010

Journal of Membrane Science

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a b s t r a c tThe layer-by-layer (LbL) assembled polyelectrolyte multilayer has recently been recognized as a new class of promising membrane material for various separation uses. However, there is a lack of understanding about the influences of separation mixtures on the adsorbed polyelectrolytes. Therefore, clear understanding on it would be very important for the design and application of a type of new functional composite membrane. In this paper, the multilayer of weak polyelectrolytes polyethyleneimine and polyacrylic acid was constructed onto a hydrolyzed hollow fiber polyacrylonitrile support membrane under a negative pressure condition. The salt-, pH-and oxidant-responsive pervaporation behaviors of polyelectrolyte multilayer membranes were evaluated by post-treating with sodium chloride, hydrochloric acid, sodium hydroxide and sodium hypochlorite aqueous solutions, respectively. The pervaporation performances for separation of ethanol/water were compared before and after post-treatments. Scanning electron microscopy and atomic force microscopy confirmed the microtopographical changes of membrane surfaces. Optical microscopy was also used to real-time observe surface morphologies of polyelectrolyte multilayers deposited on the quartz substrates. Finally, the comparison of zeta potential values of inner surface before and after post-treatment also demonstrated the changes of surface electrical property.

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“…These techniques include confocal microscopy (23)(24)(25), FRET (26,27), FTIR (28), neutron reflectivity (29)(30)(31), and X-ray reflectometry (32). Confocal microscopy is limited in spatial sensitivity, as films much thicker than the typical PEM thickness (≤500 nm) are required because of a relatively low z-resolution (23)(24)(25).…”

mentioning

confidence: 99%

Depth-profiling X-ray photoelectron spectroscopy (XPS) analysis of interlayer diffusion in polyelectrolyte multilayers

Gilbert

Rubner

Cohen³

2013

Proc. Natl. Acad. Sci. U.S.A.

175

143

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Functional organic thin films often demand precise control over the nanometer-level structure. Interlayer diffusion of materials may destroy this precise structure; therefore, a better understanding of when interlayer diffusion occurs and how to control it is needed. Xray photoelectron spectroscopy paired with C 60 + cluster ion sputtering enables high-resolution analysis of the atomic composition and chemical state of organic thin films with depth. Using this technique, we explore issues common to the polyelectrolyte multilayer field, such as the competition between hydrogen bonding and electrostatic interactions in multilayers, blocking interlayer diffusion of polymers, the exchange of film components with a surrounding solution, and the extent and kinetics of interlayer diffusion. The diffusion coefficient of chitosan (M = ∼100 kDa) in swollen hydrogenbonded poly(ethylene oxide)/poly(acrylic acid) multilayer films was examined and determined to be 1.4*10 −12 cm 2 /s. Using the highresolution data, we show that upon chitosan diffusion into the hydrogen-bonded region, poly(ethylene oxide) is displaced from the film. Under the conditions tested, a single layer of poly(allylamine hydrochloride) completely stops chitosan diffusion. We expect our results to enhance the understanding of how to control polyelectrolyte multilayer structure, what chemical compositional changes occur with diffusion, and under what conditions polymers in the film exchange with the solution.XPS depth profiling | layer-by-layer films | interdiffusion

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Salt-Induced Polyelectrolyte Interdiffusion in Multilayered Films: A Neutron Reflectivity Study

Cited by 195 publications

References 54 publications

Deposition Mechanisms in Layer-by-Layer or Step-by-Step Deposition Methods: From Elastic and Impermeable Films to Soft Membranes with Ion Exchange Properties

Deposition Mechanisms in Layer-by-Layer or Step-by-Step Deposition Methods: From Elastic and Impermeable Films to Soft Membranes with Ion Exchange Properties

The salt-, pH- and oxidant-responsive pervaporation behaviors of weak polyelectrolyte multilayer membranes

Depth-profiling X-ray photoelectron spectroscopy (XPS) analysis of interlayer diffusion in polyelectrolyte multilayers

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