Enhancement of conductivity, mechanical and biological properties of polyaniline-poly(N-vinylpyrrolidone) cryogels by phytic acid

Milakin, Konstantin A.; Morávková, Zuzana; Acharya, Udit; Kašparová, Martina; Breitenbach, Stefan; Taboubi, Oumayma; Hodan, Jiří; Hromádková, Jiřina; Unterweger, Christoph; Humpolíček, Petr; Bober, Patrycja

doi:10.1016/j.polymer.2021.123450

Cited by 14 publications

(16 citation statements)

References 36 publications

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“…For the homogeneous distribution of CNF in the PANI-based composite cryogel, it is important to ensure CNF dispersibility in the reaction medium. However, based on typical aniline polymerization conditions, preparation of the cryogels is usually done in aqueous solutions, ,, in which CNF do not form a stable dispersion due to their hydrophobic nature and tendency to form aggregates . Therefore, isopropanol, which is the less polar solvent, compared to water, was used in the present work to facilitate dispersibility of CNF, and the synthesis was performed in water:isopropanol medium, where the CNF were found to be dispersible in the presence of PVP.…”

Section: Resultsmentioning

confidence: 99%

“…However, the obtained values are slightly higher than the one previously reported for PANI−PVP aerogel synthesized in water medium (9.3 m 2 g −1 ). 25 The difference can be attributed to the effect of the mixed solvent, inducing phase separation during the cryopolymerization and porosity of the pore walls, 38,39 leading to the observed morphology change, discussed earlier (Section 3.1). The total pore volume was determined from the adsorption isotherms (Figure S5) at p/p°= 0.95, which corresponds to pores with diameter less than 40.3 nm (Table 1).…”

Section: Conductivity and Specific Surfacementioning

confidence: 95%

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Double-Porous Polyaniline-Based Cryogels with Carbon Nanofibers for Supercapacitors

Milakin,

Tumacder,

Taboubi

et al. 2024

ACS Appl. Energy Mater.

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Polyaniline-poly(N-vinylpyrrolidone) cryogels/aerogels with carbon nanofibers (PANI−CNF−PVP) were prepared by oxidative cryopolymerization of aniline in water:isopropanol medium in the presence of various amounts of dispersed carbon nanofibers (CNF; 0.05−2.5 mg mL −1 ). Scanning electron microscopy showed that all prepared PANI−CNF−PVP and PANI−PVP aerogels have double-porous morphology, which is represented by macropores (5−35 μm), constituting the main threedimensional network of the materials, and smaller pores (≈200 nm − 3 μm) in the macropore walls. The incorporation of CNF into PANI−CNF−PVP aerogels was visualized by scanning and transmission electron microscopy and additionally supported by X-ray photoelectron spectroscopy. Surface area of the aerogels was found to be ≈13−25 m 2 g −1 . Based on full decomposition temperatures determined by TGA, PANI−CNF−PVP aerogels had better thermal stability (792 °C; 2.5 mg mL −1 of CNF) compared to PANI−PVP (750 °C). Starting from the lowest used CNF content (0.05 mg mL −1 ), PANI−CNF−PVP aerogels demonstrated significantly higher gravimetric capacitance (≈3−6 times), compared to PANI−PVP aerogel, reaching 201 F g −1 (1 A g −1 ; 1 mg mL −1 of CNF), in the three-electrode setup. These data were supported by electrochemical impedance spectroscopy, showing lower charge transfer resistance for PANI−CNF−PVP aerogels, which decreased with an increasing CNF fraction. CNF-containing aerogels also showed enhanced cycling stability. A two-electrode symmetrical supercapacitor was assembled using PANI−CNF−PVP aerogel (1 mg mL −1 CNF) as the active electrode material. The device reached a gravimetric capacitance of 213 F g −1 (0.5 A g −1 ) with energy and power densities of 30 Wh kg −1 and 1000 W kg −1 , respectively, and showed 95% cycling stability after 1000 cycles. The performance of this supercapacitor is comparable or often exceeds that of previously reported electrode materials, based on conducting polymers and carbon derivatives. Therefore, the prepared PANI−CNF−PVP aerogels are the promising materials for energy storage.

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Section: Resultsmentioning

confidence: 99%

Section: Conductivity and Specific Surfacementioning

confidence: 95%

Double-Porous Polyaniline-Based Cryogels with Carbon Nanofibers for Supercapacitors

Milakin,

Tumacder,

Taboubi

et al. 2024

ACS Appl. Energy Mater.

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“…This method utilizes poly (2‐hydroxyethyl methacrylate) and polyethylene glycol, which may be improved by using the Arginylglycylaspartic Acid (RGD) sequence or naturally occurring substances like agarose, alginate, gelatin, hyaluronic acid, and chitosan [90,91] . Synthetic aqueous hydrogels may be combined with electrically conducting polymers like polyaniline (PANi) and polypyrrole (PPy) to make hydrogels that conduct electricity [92] . Non‐injectable hydrogels are a novel framework for the growth and multiplication of cells, often used in the field of central nervous system tissue engineering and bioprinting.…”

Section: Limitations Imposed By Biology On the Transportation Of Drug...mentioning

confidence: 99%

Hydrogel nanoparticles as new drug delivery system for CNS disorders

Omar Khudhur,

Karimian,

Asadi

et al. 2024

ChemistrySelect

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Previous studies have shown that more than one million individuals suffer from central nervous system (CNS) diseases worldwide. Nanogels are a good way to deliver drugs because they are ultra‐stable, can hold a lot of drugs, have a core‐shell structure, are very permeable, and can get into brain tissue both in the lab and in living organisms. The blood‐brain barrier (BBB) and the blood‐cerebrospinal fluid barrier (BCSFB) make it harder to deliver therapies to specific areas of the CNS because drugs can′t get into the brain well enough. However, these barriers help treat neurological disorders like epilepsy, neurodegenerative diseases, brain tumors, and ischemic stroke. A number of biological studies suggest that nano‐additives may improve the shape, mechanical properties, electrical conductivity, and biological activities of hydrogels. The creation of nanogels for CNS drug delivery, their early preclinical success, and their potential for neurotoxicity are all examined in this research. This study looks at techniques that are almost ready for clinical use, a preclinical delivery system for the CNS, and the use of nanogels as a successful BBB‐penetration method. It also examines the main difficulties that nanogels must overcome in order to provide the most effective therapeutic care for CNS illnesses.

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“…5a). 92,128 As described in Section 2.1.2, phytic acid (PA) is adopted as the gelator and the dopant in the synthetic process of PANI, which possesses a unique structure of several anionic phosphate groups, to initiate a mesh-like hydrogel network. Bao and co-workers 55 used phytic acid as PANI's cross-linker and dopant, to generate a PANI hydrogel possessing a direct conductivity of 11 S m À1 (Fig.…”

Section: Single Component Cphsmentioning

confidence: 99%

“…88 Doping CPs with proton acid creates bipoles and dipoles along the polymer chain, transferring more carriers in the form of electrons or holes, which significantly improves the conductivity of conducting polymers. Milakin et al demonstrated that the higher content of the dopant leads to increased conductivity, 128 and this can be attributed to higher resistance to deprotonation of phytic acid doped PANI which occurs during washing of the resulting cryogels with water. Moreover, the conductivity of CPHs is highly dependent on the type and concentration of dopants.…”

Section: Properties and Applications Of Cphs In Wearable Electronicsmentioning

confidence: 99%

Conductive polymer based hydrogels and their application in wearable sensors: a review

et al. 2023

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Enhancement of conductivity, mechanical and biological properties of polyaniline-poly(N-vinylpyrrolidone) cryogels by phytic acid

Cited by 14 publications

References 36 publications

Double-Porous Polyaniline-Based Cryogels with Carbon Nanofibers for Supercapacitors

Double-Porous Polyaniline-Based Cryogels with Carbon Nanofibers for Supercapacitors

Hydrogel nanoparticles as new drug delivery system for CNS disorders

Conductive polymer based hydrogels and their application in wearable sensors: a review

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