Influence of the nature of the surface of polypyrrole films upon their interaction with volatile organic compounds

Melo, Celso P. de; Neto, B.B.; Lira, Liliana Fátima Bezerra; Souza, J.E.G. de

doi:10.1016/j.colsurfa.2004.10.026

Cited by 12 publications

(9 citation statements)

References 5 publications

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“…For the composites, the addition of 10% PPy reduced the contact angle for PCL film by ≈8° (Figures c). Melo et al reported that polypyrrole doped with PTSA showed a contact angle close to 65° that is smaller than the PCL found here. We believe that the higher hydrophilicity of PPy and the composite roughness are responsible for the contact angle decrease of PCL film.…”

Section: Resultscontrasting

confidence: 72%

Biocompatible PCL/PLGA/Polypyrrole Composites for Regenerating Nerves

Ferreira

Valente

Zanini

et al. 2019

Macromolecular Symposia

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In the field of regenerative medicine, many studies have focused on regenerating peripheral nerves because clinical problems and functional loss of organs are affecting an increasing number of people. Biocompatible polymers can be potentially used for producing biocompatible tubes in order to aid the regeneration of peripheral nerves. This study aims to prepare polymeric composites based on polycaprolactone (PCL), poly (lactic‐co‐glycolic acid) (PLGA), and polypyrrole fibers (PPy) capable of acting as a conduit for regenerating peripheral nerves. Polypyrrole is synthesized by oxidative chemical polymerization with p‐toluenesulfonic acid monohydrate (PTSA) as a doping agent. PCL/PLGA blends (100:0, 90:10, 80:20, and 70:30) (m/m) and PCL/PLGA composites with 10% PPy fibers were prepared by the solvent casting method. PPy with a diameter of 88–974 nm showed electrical conductivity of 2.0 × 10−1 S cm−1. The nontoxic composite films with hydrophilic and porous surfaces presented a thermal stability and degradation period that were suitable for potential use in the regeneration of peripheral nerves.

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Section: Resultscontrasting

confidence: 72%

Biocompatible PCL/PLGA/Polypyrrole Composites for Regenerating Nerves

Ferreira

Valente

Zanini

et al. 2019

Macromolecular Symposia

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“…The films presented the first advancing contact angle (θ a,1 ) values very different. The PPyClO 4 sample showed a contact angle value of 104°, which confirms its hydrophobic behavior 28. On the other hand, PPyPSacc samples revealed their hydrophilic nature showing values lower than 90°, the PPyHep material being the most hydrophilic sample.…”

Section: Resultsmentioning

confidence: 53%

Polypyrrole‐polysaccharide thin films characteristics: Electrosynthesis and biological properties

Moreno

Panero

Materazzi

et al. 2008

J Biomedical Materials Res

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Polypyrrole-polysaccharide thin films were electropolymerized from starting solutions containing pyrrole and a polysaccharide, namely, heparin, chondroitin-4-sulphate or hyaluronic acid. The synthesized samples showed good chemical and physicochemical properties determined by the synthesis parameters such as the current density and time. For instance, the sample morphology was strictly correlated to the current density as follows: a smooth surface morphology was observed when the current density was in the range of 100-700 microA/cm(2), whereas high current (I > 1.0 mA/cm(2)) or longer time (synthesis charge > 100 mC/cm(2)) led to rough surfaces. The presence of polysaccharide within the polymeric matrix assured proper hydrophilicity to the samples. The optimized surface chemistry due to the presence of a polysaccharide and the controllable morphology allowed positive cell/substrate interactions and these are proved by cellular tests using MC3T3-E1 osteoblast cultures.

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“…In the previous sensor development and evaluation studies, principal component analysis (PCA) has been used to discriminate the sensor sensitivities to various VOCs [31,34,43]. PCA reduces the correlation (redundancy) within the sensor sensitivities for each VOC class and orthogonally projects the sensitivity data on a few uncorrelated dimensions [35] to obtain the maximum variation components that can be used to classify the VOC classes.…”

Section: Discussionmentioning

confidence: 99%

Development and evaluation of chemoresistive polymer sensors for low concentration detection of volatile organic compounds related to food safety applications

Khot

Panigrahi

Sengupta

2010

Sens. & Instrumen. Food Qual.

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This study was aimed at the development and evaluation of regioregular poly (3-hexyl thiophene) (rr-P3HT) based chemoresistive sensors to detect the alcoholic volatile organic compounds (VOCs): 3-methyl-1-butanol and 1-hexanol, found to be present in spoiled and Salmonella typhimurium contaminated beef packages. The sensors were developed using two types of dip coating methods: (1) vertical dip (90°), and (2) inclined dip (10°). Five layers of rr-P3HT were deposited on tin interdigitated flame retardant FR4 substrates. The morphological studies revealed that the rr-P3HT sensors developed with the inclined dip coating method had formed relatively smooth thin-film of rr-P3HT than sensors developed using the vertical dip coating method. The sensitivities of the vertical dip and inclined dip coated sensors were found to be repeatable for the same concentration and were also reproducible among different sensors for same VOC. The sensors exhibited selective response to trace level concentrations of 3-methyl-1-butanol and 1-hexanol, with a lower detection limit of about 10 and 15 ppm, respectively.

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Influence of the nature of the surface of polypyrrole films upon their interaction with volatile organic compounds

Cited by 12 publications

References 5 publications

Biocompatible PCL/PLGA/Polypyrrole Composites for Regenerating Nerves

Biocompatible PCL/PLGA/Polypyrrole Composites for Regenerating Nerves

Polypyrrole‐polysaccharide thin films characteristics: Electrosynthesis and biological properties

Development and evaluation of chemoresistive polymer sensors for low concentration detection of volatile organic compounds related to food safety applications

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