Electrochemical polymerization of pyrrole over AZ31 Mg alloy for biomedical applications

Srinivasan, Ananda Kumar; Ranjani, P.; Rajendran, N.

doi:10.1016/j.electacta.2012.10.087

Cited by 89 publications

(51 citation statements)

References 43 publications

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“…Mg ions react with salicylate in solution forming a low solubility chelate complex that precipitates on the metal surface [18]. At +0.8 V vs. SCE an extended second anodic process is due to the oxidation of salicylate ions in solution [8]. This process is irreversible because there is no reduction peak.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

“…The reported data correspond to an average of at least three experiments. The PPy films were characterized by a Nicolet 360 FTIR spectrophotometer and the spectra compared with spectra reported elsewhere in the literature [7,8].…”

Section: Methodsmentioning

confidence: 99%

“…In these solutions, nucleation and growth of the PPy film at a potential at ca. +0.8 V vs. SCE takes place [8,25]. The nucleation and growth processes are evidenced by the crossing potentials at +0.8 V and +0.73 V vs. SCE for SA-Py and SA-Py-0.5IBU solutions, respectively, during the reverse scan towards negative values [8].…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

“…1. Although AZ31 Mg alloys are naturally active in aqueous media and possess extremely high negative redox potentials, the presence of species capable of forming a stable protective layer, contributes to the displacement of the OCPs to nobler values [8,18,19]. The AZ31 Mg alloy in SA-Py solution displays an OCP of −1.75 ± 0.022 V vs. SCE which rapidly changes to a less negative value of −1.619 ± 0.002 V vs. SCE as is seen in curve (a) of Fig.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

“…Typical alloys for self-powered drug release include Mg (97 % Mg, 2 % Al, 1 % Zn) [1], Mg (99.9 % purity) [2], sputtered Mg thin films [5], and AZ91D and AZ31 Mg alloys [7,8]. These alloys are attractive as they match the mechanical properties of the human bones.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

The importance of the film structure during self-powered ibuprofen salicylate drug release from polypyrrole electrodeposited on AZ31 Mg

Alshammary

Casillas

Cook

et al. 2016

J Solid State Electrochem

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Therapeutic drugs uploaded into conjugated conductive polymer matrices deposited on active magnesium alloys serve as controlled-dose, self-powered drug-delivery systems. Preferentially, drugs are added into polymer films in the largest amount possible, mostly to prevent long-term treatments. However, added drugs can interact with the polymer matrix affecting either the structure or the final mechanical properties of the polymer film. In this work, polypyrrole films (PPy) electrodeposited on an AZ31 Mg alloy in ibuprofen and salicylate-containing solutions are investigated in terms of their uploading capacity, surface morphology and mechanical properties. The techniques used to investigate the uploaded PPy films include cyclic voltammetry (CV), scanning electron microscopy (SEM), EDS, and depth-sensing indentation (DSI). A maximum ibuprofen concentration of 440 ± 40 μg cm −2 was obtained in PPy films in the presence of sodium salicylate. The release fraction of ibuprofen as a function of time is fitted to Avrami's equation. The hardness and reduced modulus decreased by 54 and 40 %, respectively, when the PPy films are prepared in the presence of sodium ibuprofen compared with those prepared in sodium salicylate only, indicating a more plastic film with ibuprofen.

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Section: Electrochemical Characterizationmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Electrochemical Characterizationmentioning

confidence: 99%

Section: Electrochemical Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The importance of the film structure during self-powered ibuprofen salicylate drug release from polypyrrole electrodeposited on AZ31 Mg

Alshammary

Casillas

Cook

et al. 2016

J Solid State Electrochem

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Antibacterial Property and Biocompatibility of Polypyrrole Films Treated by Oxygen Plasma Immersion Ion Implantation

Qiu

Liu

2020

Adv Materials Inter

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Polypyrrole (PPy) films obtained by oxidative polymerization have positive charges in its main chains and therefore exhibit antibacterial properties to some extent. However, antibacterial activities of PPy films for biomedical applications are still insufficient. Here, to endow PPy films with excellent antibacterial properties and biocompatibility, oxygen plasma immersion ion implantation (O‐PIII) is performed to regulate their physicochemical properties, including but not limited to wettability and surface charge. Escherichia coli, Staphylococcus aureus, and MC3T3‐E1 cells are utilized to investigate the antibacterial properties and cytocompatibility, respectively. Results show that antibacterial property of PPy films against E. coli is enhanced after O‐PIII treatment, and it becomes more outstanding with the increase of implantation time, which may be ascribed to the improved hydrophilicity and change of sample surfaces from negatively charged to positively charged. The similar results cannot be found from S. aureus due to different cell membrane structure. Meanwhile, O‐PIII can significantly improve the biocompatibility of PPy films.

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Electrochemical Considerations for the Electropolymerization of PPy on PEDOT:PSS for Yarn Actuator Applications

2023

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Electrochemical devices as conducting polymer‐based actuators or textile actuators often use layers of different conducting polymers. Although research has been performed on such devices, it is still not very clear how the different layers affect each other. Here we attempt to clarify such influence on yarn actuators using electrochemical methods. Different electrochemical methods as cyclic voltammetry, chronoamperometry or chronopotentiometry were used to electropolymerize polypyrrole on top of a poly(3,4‐ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) coated textile yarns by using different applied electrochemical conditions (potentials/currents). Thus, we found that selecting suitable conditions (as an applied potential of +0.8 V) for such electropolymerization is key to obtain a polypyrrole of high quality. Besides, we show that the underlying layer of PEDOT:PSS has an influence on such electropolymerization conditions and can be subjected to parallel redox reactions as oxidation or electrochemical degradation that influence the electropolymerized polypyrrole.

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Electrochemical polymerization of pyrrole over AZ31 Mg alloy for biomedical applications

Cited by 89 publications

References 43 publications

The importance of the film structure during self-powered ibuprofen salicylate drug release from polypyrrole electrodeposited on AZ31 Mg

The importance of the film structure during self-powered ibuprofen salicylate drug release from polypyrrole electrodeposited on AZ31 Mg

Antibacterial Property and Biocompatibility of Polypyrrole Films Treated by Oxygen Plasma Immersion Ion Implantation

Electrochemical Considerations for the Electropolymerization of PPy on PEDOT:PSS for Yarn Actuator Applications

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