Influence of layer-by-layer deposition techniques and incorporation of layered double hydroxides (LDH) on the morphology and gas barrier properties of polyelectrolytes multilayer thin films

Larocca, Nelson M.; Filho, Rubens Bernardes; Pessan, Luiz Antônio

doi:10.1016/j.surfcoat.2018.05.030

Cited by 22 publications

(10 citation statements)

References 78 publications

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“… 4 The linear growth of the spin-sprayed films can be attributed to the high shear stress within the thin solution layer and its rapid drying, which shortens the time available for structural rearrangements or diffusion during the assembly process. 39 , 41 , 46 , 47 In addition, the GO sheets will also be aligned with the surface and diminish intrafilm diffusion. Linear growth is, in fact, generally observed with spin-sprayed polyelectrolyte multilayers.…”

Section: Results and Discussionmentioning

confidence: 99%

“…This is especially important because the gas permeation studies have shown that the spin-spray-assembled films with plate-like components are better barriers than those prepared using the dip LbL technique. 47 , 49 Therefore, the aim of this work is twofold. First, we study the effect of the deposition technique on the structure and properties of coordinative multilayers containing large plate-like GO particles.…”

Section: Introductionmentioning

confidence: 99%

“…The centrifugal force advances the draining and subsequent drying of the surface, and the assembly of an individual layer, including the rinsing and drying of the film, takes less than a minute. In addition, the spin-spray technique requires less material and decreases the material waste, leading to smoother films with more uniform electrical and optical properties. ,,,, With the dip LbL technique, the multilayer build-up is exponential, at least in the beginning, but with the spin-spray method, the films grow linearly, they are generally more stratified, and the plate-like components are more parallel to the surface. The spin-spray LbL technique has been applied, for example, to conducting and transparent films, , gas barrier films, , antifogging coatings, films for corrosion or electromagnetic shielding, , and in batteries. , …”

Section: Introductionmentioning

confidence: 99%

“…Although the dip LbL and spray LbL techniques have been compared previously, ,− there are only a few papers thoroughly comparing the spin-spray and dip LbL techniques. , The work mostly emphasizes the effect of the deposition method on the film morphology, thickness, and the material consumption. However, the chemically reactive (PP/Ce/GO/Ce) LbL multilayers set some specific requirements for the film properties, and it is necessary to see the effect of the LbL technique on intrafilm diffusion of the reactants (oxidant and monomers), the reactant capacity, the reaction kinetics, and the formation and properties of the produced post-LbL-assembly film.…”

Section: Introductionmentioning

confidence: 99%

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Oxidative Spin-Spray-Assembled Coordinative Multilayers as Platforms for Capacitive Films

et al. 2020

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The spin-spray-assisted layer-by-layer (LbL) assembly technique was used to prepare coordinative oxidative multilayers from Ce(IV), inorganic polyphosphate (PP), and graphene oxide (GO). The films consist of successive tetralayers and have a general structure (PP/Ce/GO/Ce) n . Such oxidative multilayers have been shown to be a general platform for the electrodeless generation of conducting polymer and melanin-type films. Although the incorporation of GO enhances the film growth, the conventional dip LbL method is very time consuming. We show that the spin-spray method reduces the time required to grow thick multilayers by the order of magnitude and the film growth is linear from the beginning, which implies a stratified structure. We have deposited poly(3,4-ethylenedioxothiophene), PEDOT, on the oxidative multilayers and studied these redox-active films as models for melanin-type capacitive layers for supercapacitors to be used in biodegradable electronics, both before and after the electrochemical reduction of GO to rGO. The amount of oxidant and PEDOT scales linearly with the film thickness, and the charge transfer kinetics is not mass transfer-limited, especially after the reduction of GO. The areal capacitance of the films grows linearly with the film thickness, reaching a value of ca . 1.6 mF cm –2 with 20 tetralayers, and the specific volumetric (per film volume) and mass (per mass of PEDOT) capacitances are ca . 130 F cm –3 and 65 F g –1 , respectively. 5,6-Dihydroxyindole can also be polymerized to a redox-active melanin-type film on these oxidative multilayers, with even higher areal capacitance values.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oxidative Spin-Spray-Assembled Coordinative Multilayers as Platforms for Capacitive Films

et al. 2020

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“…Multilayer films have thus gained attention due to these providing certain mechanical, barrier or heat-sealing properties that monolayer films cannot offer [2,3]. Multilayer films have been used for creating AO or antimicrobial (AM) packaging using polymers alone or in combination with other materials such as paper or fibers [4][5][6][7]. Among them, low-and high-density polyethylene (LDPE and HDPE), ethylene-vinyl acetate (EVA), poly(lactic acid) films (PLA), poly(ethylene terephthalate) (PET) or polypropylene (PP) are commonly used as substrates in active packaging material.…”

Section: Introductionmentioning

confidence: 99%

Effect of supercritical CO2 and olive leaf extract on the structural, thermal and mechanical properties of an impregnated food packaging film

Cejudo-Bastante

Cran

Casas

et al. 2019

The Journal of Supercritical Fluids

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Poly(ethylene terephthalate)/polypropylene (PET/PP) films containing olive leaf extract (OLE) were obtained by supercritical solvent impregnation (SSI) in batch (BM) and semi-continuous (SM) modes.The study focused on the impact of pressure, temperature, CO2 flow and OLE on the properties of the impregnated films. Thermal analysis of non-impregnated samples revealed a decrease in the crystallinity of PP layer treated at 35 ºC and an increase in the Tg of PET treated at 55 ºC due to CO2 sorption. In impregnated samples, high pressures caused a decrease in the crystallinity of PP layer, whereas PET layer remained unaffected. Higher pressures favour impregnation in BM, whereas different trends were found for SM impregnations. Although the film properties were not compromised after impregnation, the CO2 stream used in SM slightly weakened the impregnated films. Overall, conditions of 400 bar and 35ºC in BM were favorable for producing highly antioxidant films with minor structural modifications.

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Efficient preparation of hydrogen barrier films by ultrasonic‐assisted layer‐by‐layer assembly

Miao

Gao

et al. 2023

J of Applied Polymer Sci

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Graphene oxide (GO) can be self‐assembled with various polymer materials layer by layer to prepare composite materials with excellent barrier properties. However, the process is cumbersome and time‐consuming. In this article, GO/polyethyleneimine(PEI) hydrogen barrier films were successfully prepared by ultrasonic‐assisted layer‐by‐layer self‐assembly technology. Results show that the ultrasonic‐assisted method not only reduced the immersion time from several minutes to 10 s, but also increased the density of the material packing to reduce the channels through which hydrogen molecules can diffuse while improving the horizontal orientation of the GO sheet to prolong the diffusion paths of gas molecules. Finally, the hydrogen transmission rate of 20‐bilayer films assembled under ultrasonic conditions is equivalent to that of 30‐bilayer films assembled without ultrasonic conditions, which greatly shortens the film‐making period. Therefore, the ultrasonic‐assisted method has a good prospect in the preparation of gas barrier films.

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Influence of layer-by-layer deposition techniques and incorporation of layered double hydroxides (LDH) on the morphology and gas barrier properties of polyelectrolytes multilayer thin films

Cited by 22 publications

References 78 publications

Oxidative Spin-Spray-Assembled Coordinative Multilayers as Platforms for Capacitive Films

Oxidative Spin-Spray-Assembled Coordinative Multilayers as Platforms for Capacitive Films

Effect of supercritical CO2 and olive leaf extract on the structural, thermal and mechanical properties of an impregnated food packaging film

Efficient preparation of hydrogen barrier films by ultrasonic‐assisted layer‐by‐layer assembly

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