Using Conducting Polymers as Active Agents for Marine Antifouling Paints

Baldissera, Alessandra F.; Miranda, Karine Leite de; Bressy, Christine; Martin, Claire; Margaillan, André; Ferreira, Carlos Arthur

doi:10.1590/1516-1439.261414

Cited by 23 publications

(9 citation statements)

References 24 publications

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“…54 Conducting polymers are known to possess bacterial inhibition properties due to their ability to participate in redox electron transfer reactions or cause irreversible damage to cell membranes, resulting in leakage of bacterial cell contents. ICPs like PEDOT and PANI have been employed as antifouling materials for various environments, 55,56 and the present study shows that PCZ can have more potent bacterial inhibitory action than PANI. It is also evident that ICP composites enable charge transfer to bacterial cells due to electrical stimulation and increase bacterial inhibition.…”

Section: ■ Results and Discussionmentioning

confidence: 53%

Flexible Nanogenerator from Electrospun PVDF–Polycarbazole Nanofiber Membranes for Human Motion Energy-Harvesting Device Applications

Sengupta

Das

Dasgupta

et al. 2021

ACS Biomater. Sci. Eng.

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Poly(vinylidene difluoride) (PVDF) has become the polymer matrix of choice for fabrication of wearable electronics and physiological monitoring devices. Despite possessing a high piezoelectric constant, additives are required to increase the charge transfer from PVDF matrix to connected signal readout units. Many of these additives also stabilize the β-phase of PVDF, which is associated with highest piezoelectric coefficients. However, most of the additives used are often brittle ceramic-phase materials resulting in decreased flexibility of the devices and offsetting the gain in β-phase content. Intrinsically conducting polymers (ICP), on the other hand, are ideal candidates to improve the device-related properties of PVDF, due to their higher flexibility than ceramic fillers as well as ability to form conducting network in PVDF membranes. This work reports the performance and device feasibility of PVDF–polycarbazole (PCZ) electrospun nanofiber membranes. A higher β-phase was observed by FTIR spectroscopy in PVDF/PCZ compared to other PVDF phases. Moreover, a higher open-circuit potential was recorded over PVDF/polyaniline composites, which were studied for comparison. The addition of PCZ reduced the flexibility of pure PVDF nanofibers by 20% only. Besides, the work investigated the bacterial biofouling and cell compatibility of the matrix, as essential properties to examine any putative medical device application. PVDF/PCZ membranes were then used to develop a nanogenerator, which was capable of instantly lighting an entire LED array employing the rectified output power, and charged up a 2.2 μF capacitors using a bridge rectifier through a vertical compressive force applied periodically. Finally, the nanogenerator demonstrated electrical energy harvesting from movements of various parts of the human body, such as toe and heel movement and wrist bending. In conclusion, PCZ can be considered as an attractive, biocompatible, and anti-biofouling conducting polymer for electrical actuation and flexible electronic device applications.

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Section: ■ Results and Discussionmentioning

confidence: 53%

Flexible Nanogenerator from Electrospun PVDF–Polycarbazole Nanofiber Membranes for Human Motion Energy-Harvesting Device Applications

Sengupta

Das

Dasgupta

et al. 2021

ACS Biomater. Sci. Eng.

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“…According to TG/DTG results, three weight loss steps were observed for the pure A epoxy system (Figs (a) and (b)). The first maximum degradation temperature (T max ) from the DTG curve is associated with the loss of water (T max ∼50°C), whereas the degradation of unreacted curing agent or oligomers as well as of polymeric chains is observed at T max ∼150°C and T max ∼385°C, respectively …”

Section: Resultsmentioning

confidence: 84%

“…The first maximum degradation temperature (T max ) from the DTG curve is associated with the loss of water (T max ß50°C), whereas the degradation of unreacted curing agent or oligomers as well as of polymeric chains is observed at T max ß150°C and T max ß385°C, respectively. 59,60 For the pure cement paste before CO 2 exposure, five weight loss steps were found (Figs 8(c) and 8(d), solid line). The first and second degradation weight loss steps are attributed to the loss of free or evaporable water, being observed at T max ß58°C and 88°C.…”

Section: Thermogravimetric Analysis (Tga)mentioning

confidence: 85%

Epoxy resin‐cement paste composite for wellbores: Evaluation of chemical degradation fostered carbon dioxide

et al. 2017

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Excessive carbon dioxide (CO2) environmental emission can be partially solved using carbon geological storage technologies. Up‐to‐date materials in CO2 injection wells are strongly susceptible to acidic attacks causing their irreversible damage over a long time scale. This study investigates degradation by CO2 of epoxy resin‐cement paste composites at elevated pressure (50 bar) and temperature (70°C) to mimic wellbore conditions. The effect of epoxy resins on cement carbonation was evaluated by phenolphthalein test, field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and numerical simulations. According to electronic‐structure‐based molecular dynamics simulations, the epoxy resin forms a separate phase that blocks potential reaction sites between the cement and CO2. Thanks to CO2‐phobic behavior, the resin repels CO2 and minimizes cement damage due to degradation process. The optimal content of epoxy resin in the cement paste was up to 30% w/w. The reported results provide clear guidelines for further evolution of reinforced cements for use in CO2 injection wellbores. © 2017 Society of Chemical Industry and John Wiley & Sons, Ltd.

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“…It may be remarked that the thermal stability increased three times in comparison to the bare resin with the 3 phr content, which is a threshold that comes in accordance with the electrical conductivity measurements. Finally, it should be mentioned that the difference observed in the inset graph at 200 • C, which corresponds to the bare resin (black squares), is a typical behavior of epoxy resins, which is attributed to moisture loss and entrapped solvent remaining in the sample, according to Baldissera et al [45].…”

Section: Electrical Conductivity Evaluationmentioning

confidence: 91%

Assessing the Critical Multifunctionality Threshold for Optimal Electrical, Thermal, and Nanomechanical Properties of Carbon Nanotubes/Epoxy Nanocomposites for Aerospace Applications

et al. 2019

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Epoxy composites are widely used in primary aerospace structures, where high impact damage properties are necessary. However, challenges appear when multiple functionalities, including electrical and thermal conductivity, are needed in parallel with increased mechanical properties. The current study aims at the assessment of a critical concentration of multiwalled carbon nanotubes (MWCNTs), incorporated in epoxy resin, which will indicate a threshold for optimal electrical, thermal and mechanical properties. For the evaluation of this optimal concentration, electrical conductivity, thermal stability and nanomechanical properties (Young modulus and nanohardness) have been assessed, for epoxy nanocomposites with 0 to 15 parts per hundred resin per weight (phr) MWCNTs. Percolation theory was applied to study the electrical conductivity for different contents of MWCNTs in the epoxy nanocomposite system. Thermogravimetric analysis was employed for the assessment of the epoxy composites’ thermal properties. Nanohardness and elastic modulus were measured, and the hardness versus modulus index was calculated. Emphasis was given to the dispersion of MWCNTs in the epoxy matrix, which was assessed by both microscopy techniques and X-ray micro–computed tomography. A correlation between the optimum dispersion and MWCNTs content in terms of electrical conductivity, thermal stability, and nanomechanical properties revealed a threshold concentration at 3 phr, allowing the manufacturing of aerospace structures with multifunctional properties.

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Using Conducting Polymers as Active Agents for Marine Antifouling Paints

Cited by 23 publications

References 24 publications

Flexible Nanogenerator from Electrospun PVDF–Polycarbazole Nanofiber Membranes for Human Motion Energy-Harvesting Device Applications

Flexible Nanogenerator from Electrospun PVDF–Polycarbazole Nanofiber Membranes for Human Motion Energy-Harvesting Device Applications

Epoxy resin‐cement paste composite for wellbores: Evaluation of chemical degradation fostered carbon dioxide

Assessing the Critical Multifunctionality Threshold for Optimal Electrical, Thermal, and Nanomechanical Properties of Carbon Nanotubes/Epoxy Nanocomposites for Aerospace Applications

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