Desenvolvimento de um sistema automatizado para a fabricação de filmes automontados

Trivinho‐Strixino, Francisco; Pereira, Ernesto C.; Lopes, Luis Roberto C.

doi:10.1590/s0100-40422004000400022

Cited by 8 publications

(4 citation statements)

References 2 publications

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“…The Journal of Physical Chemistry B ARTICLE Self-assembly was performed using a homemade device, which basically consists of an analogic XY recorder that has been adapted to function as an immersion and displacement robot controlled by software. 65 The bilayers were assembled by the subsequent immersion of ITO substrate in PANI and PSS solution, respectively, for 3 min. Before each step, the films were washed in the acidic solution (pH 3.0) for 15 s and then dried in air for 5 min.…”

Section: Methodsmentioning

confidence: 99%

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Investigation of Electrochemical Degradation Process in Polyaniline/Polystyrene Sulfonated Self-Assembly Films by Impedance Spectroscopy

et al. 2011

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In this study, the electrochemical degradation of polyaniline/polystyrene sulfonated (PANI/PSS) self-assembly films was investigated by an electrochemical impedance technique using transmission line models to fit the results. The experiments were performed by polarizing the working electrode at a fixed oxidative potential of 0.55 V. The results showed that changes in the electrochemical behavior of the oxidized PANI/PSS film occurred mainly in the polymer/solution interface by an increase in the charge transfer resistance.

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Section: Methodsmentioning

confidence: 99%

“…Self-assembly was performed using a homemade device, which basically consists of an analogic XY recorder that has been adapted to function as an immersion and displacement robot controlled by software . The bilayers were assembled by the subsequent immersion of ITO substrate in PANI and PSS solution, respectively, for 3 min.…”

Section: Methodsmentioning

confidence: 99%

Investigation of Electrochemical Degradation Process in Polyaniline/Polystyrene Sulfonated Self-Assembly Films by Impedance Spectroscopy

et al. 2011

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“…The washing solutions was prepared by adjusting the pH of pure water to the pH of each polymer solution. Finally, the solutions were used in the film assembly apparatus [38].…”

Section: Introductionmentioning

confidence: 99%

Properties improvement of poly(o-methoxyaniline) based supercapacitors: experimental and theoretical behaviour study of self-doping effect

Gonçalves

Christinelli

Trench

et al. 2017

Electrochimica Acta

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ABSTRACT:Conducting polymers (CP) are very versatile materials with important properties due to their unique structure, including redox behaviour upon electrochemical polarization. Supercapacitors are among the devices in which CP show a promising performance due to their large specific capacitance. However, the major drawback of these materials is their low durability, which is an inbuilt process caused by ion intercalation, a side effect of the redox process. A viable strategy to increase CP stability is, therefore, the inhibition of the ion intercalation/de-intercalation process. Several strategies have been proposed to minimize this effect, among them self-doping. Self-doping makes the redox process mass-transport independent, decreasing the response time and increasing durability. With this purpose, this work have described the synthesis of layer-by-layer films (LBL) of poly(omethoxyaniline)/poly(3-thiopheneacetic acid) (POMA/PTAA) and contributes to understand how the redox process leads to premature aging, and how self-doping minimizes this problem. The main techniques of characterisation used were electrochemical impedance spectroscopy (EIS) experiments and density functional theory (DFT) calculations. EIS provides important information about the electrochemical behaviour, while DFT calculations allowed to characterize, at the molecular level, the changes in the material structure. The association of both techniques helped to understand how self-doping improves the POMA properties. DFT calculations showed that in the layer-by-layer (LBL) films, the twisting of the polymer chain due to the oxidation is 12% less while the chain shortening is 5% compared with films prepared POMA by casting. The EIS data showed the effect of these molecular changes in the structure; the swelling of the LBL films is 50% less than cast ones. These observations are important because the PTAA layer acts beyond a chargecompensator, working as a backbone structure that mechanically stabilize the POMA layer, leading to an increase in the durability, and improving the electrochemical properties.

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“…A number of commercial and homemade programmable lifts and mechanical robots have been developed. [11][12][13][14][15][16][17][18][19][20][21] Spraying of alternating polyelectrolyte solutions has been suggested for fast coating of large areas. [22] Here, we suggest another approach for the automation of LbL deposition.…”

Section: Introductionmentioning

confidence: 99%

Automated Layer‐by‐Layer Deposition of Polyelectrolytes in Flow Mode

Ivanov

Kurniawan

Tsakova

et al. 2009

Macro Materials & Eng

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Multilayer structures of conducting polymers were fabricated by a simply automated approach in flow mode. Polyaniline and poly(styrene sulfonate) were used as a model system, allowing a fast electrochemical and spectroscopic determination of the amount of deposited material. The technology was applied for layer‐by‐layer deposition of up to 100 bilayers. The results demonstrate a well reproducible and almost constant amount of the adsorbed polymer at each deposition cycle. The method can be applied for deposition of other conducting or non‐conducting polymers, biological macromolecules and composites of polyelectrolytes and nanoparticles.magnified image

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Desenvolvimento de um sistema automatizado para a fabricação de filmes automontados

Cited by 8 publications

References 2 publications

Investigation of Electrochemical Degradation Process in Polyaniline/Polystyrene Sulfonated Self-Assembly Films by Impedance Spectroscopy

Investigation of Electrochemical Degradation Process in Polyaniline/Polystyrene Sulfonated Self-Assembly Films by Impedance Spectroscopy

Properties improvement of poly(o-methoxyaniline) based supercapacitors: experimental and theoretical behaviour study of self-doping effect

Automated Layer‐by‐Layer Deposition of Polyelectrolytes in Flow Mode

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