High Dielectric Constant Study of TiO<sub>2</sub>-Polypyrrole Composites with Low Contents of Filler Prepared by<i>In Situ</i>Polymerization

Ahmed, Khalil; Kanwal, Farah; Ramay, Shahid M.; Mahmood, Asif; Atiq, Shahid; Al-Zaghayer, Yousef S.

doi:10.1155/2016/4793434

Cited by 17 publications

(9 citation statements)

References 24 publications

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“…However, plasma proteins or PEI did not show such a characteristic peak contributed (1188 cm −1 ) from PPy. A similar finding in literature showed that the CC stretching vibration in pyrrole ring was observed at the same characteristic peak (1188 cm −1 , Figure c) . Chemical structures of PPy‐PEI NPs and PPy‐PEI‐P NCs were further confirmed by 1 H‐nuclear magnetic resonance (NMR) spectroscopy, and the spectra are shown in Figure d.…”

Section: Resultsmentioning

confidence: 99%

Self‐Targeting, Immune Transparent Plasma Protein Coated Nanocomplex for Noninvasive Photothermal Anticancer Therapy

Burnouf

et al. 2017

Adv Healthcare Materials

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Cancer cells exhibit specific physiological differences compared to normal cells. Most surface membranes of cancer cells are characterized by high expression of given protein receptors, such as albumin, transferrin, and growth factors that are also present in the plasma of patients themselves, but are lacking on the surface of normal cells. These distinct features between cancer and normal cells can serve as a niche for developing specific treatment strategies. Near-infrared (NIR)-light-triggered therapy platforms are an interesting novel avenue for use in clinical nanomedicine. As a photothermal agent, conducting polymer nanoparticles, such as polypyrrole (PPy), of great NIR light photothermal effects and good biocompatibility, show promising applications in cancer treatments through the hyperthermia mechanism. Autologous plasma proteins coated PPy nanoparticles for hyperthermia therapy as a novel core technology platform to treat cancers through secreted protein acid and rich in cysteine targeting are developed here. This approach can provide unique features of specific targeting toward cancer cell surface markers and immune transparency to avoid recognition and attack by defense cells and achieve prolonged circulation half-life. This technology platform unveils new clinical options for treatment of cancer patients, supporting the emergence of innovative clinical products.

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Section: Resultsmentioning

confidence: 99%

Self‐Targeting, Immune Transparent Plasma Protein Coated Nanocomplex for Noninvasive Photothermal Anticancer Therapy

Burnouf

et al. 2017

Adv Healthcare Materials

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“…The study of ferroelectric particles into the conducting polymer matrix has revealed that there is a decrease in conductivity with the increase in the wt % or vol % of the filler [35]. Keeping in view such investigations and focusing the effect of processing conditions on the conductivity of such polymers, the composites using TiO 2 in PPy and TiO 2 -PVA in PPy [36,37] were successfully prepared and characterized exhibiting excellent dielectric behaviour found both at low and high frequencies of the applied electric field (AC). The trend was attributed to the very small particle size in the final composites which offered large surface to volume ratio for high interfacial polarization.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of BaTiO3/Polypyrrole Composites with Exceptional Dielectric Behaviour

et al. 2018

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Higher concentrations of ceramic fillers induce brittleness in the ceramic/polymer hybrids which restrict their applications to limited fields especially when such hybrids are prepared for their use as dielectrics. We have synthesized and characterized different BaTiO3-polypyrrole (PPy) composites by changing the concentration of BaTiO3 from 1% by weight of PPy taken to 5 wt % to explore its effect on the dielectric parameters of the final product and found that the BaTiO3-polypyrrole composite with weight ratio of 0.05:1 exhibited highest dielectric constant, lowest dielectric loss and thermally most stable. All the composites were prepared using in-situ polymerization of pyrrole in an aqueous dispersion of low content of BaTiO3 in the presence of small amount of Hydrochloric acid. These composites were characterized for their microstructure and crystallinity by X-ray diffractometer (XRD), Fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM) while thermal stability by thermo gravimetric (TGA) analysis. An impedance analyser (LCR meter) was utilized to investigate the dielectric parameters. FT-IR data confirmed the presence of the two phases and their interaction, inferred from the shifting of normal PPy peaks. The data obtained from XRD confirmed the presence of crystallites of 2.8 to 5 nm with dominant crystallinity of the filler, TGA analysis (25 to 600 °C) confirmed the higher thermal stability induced on successive addition of the filler into the prepared composites as compared to that of pure PPy in a wide temperature range which is unusual for such a low % age addition of the filler. The SEM analysis together with XRD results reveal that the successive introduction of BaTiO3 particles produced crystallites of 2 to 5 nm size which bonded together and changed the hemispherical shaped larger grains of the matrix to regular shaped smaller grains. The dielectric constant of the composites was enhanced with filler contents from 178 to 522 at 1 MHz for 1 wt % and 5 wt % BaTiO3 respectively. It was concluded that the introduction of BaTiO3 into the polymer matrix with this new procedure has greatly affected the polymerization process, thermal stability, morphology and dielectric properties of the host matrix and has resulted in a novel series of the composites which may have broad applications.

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“…Thus, overall dielectric signature for the PA and copolymer is similar except the fact that the copolymers exhibit intermediate dielectric values at lower frequency compared to the homopolymers. It is worth notifying that the observed dielectric features in these systems are superior to various other conducting polymers complexes based on MEH-PPV hybrid systems as well as conducting polymer-based composite systems [63][64][65], which makes these systems interesting materials for next-generation organo-electronics. Figure 5 shows the TGA profiles of all the PA, P-3-NA and copolymer samples.…”

Section: Electrical Conductivity Comparative Studymentioning

confidence: 98%

Synthesis, characterization and physicochemical studies of copolymers of aniline and 3-nitroaniline

Waware

Majumdar²

2019

Polym. Bull.

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Polyaniline (PA), the versatile conducting polymer, owing to its tunable optoelectronic properties, facile preparation methodology and reversible redox behavior, has elicited much interest among current researchers, particularly in the fields of energy generation storage devices, protective coatings and electrochemical sensors. However, its commercialization has been much restricted due to low solution processability and thermal stability. Recent studies reveal that the above-mentioned challenges can effectively be addressed by copolymerization of PA with suitable components. In addition, the properties of copolymers could be modified and tuned by varying the monomer ratios. Thus, the present work is concerned with the fabrication of poly(aniline-co-3-nitroaniline) with varying compositions obtained by in situ oxidative copolymerization of aniline and 3-nitroaniline by altering the molar ratio of monomers. Optimization of the physicochemical properties such as UV-visible absorption, solubility, thermal stability, electrical conductivity and dielectric signatures, particle size and morphology was achieved by varying the composition of monomeric substituents in these copolymers. Smoother morphology of the copolymer films was revealed by morphological studies via AFM technique and supported by particle size distribution study. The physicochemical trends demonstrated that proper proportions of nitro (-NO 2) group in the polymer chain are essential to achieve desired optimal physicochemical properties. Therefore, copolymers are ideally appropriate for multifaceted applications and would promote wider usage of conjugated polymers in various fields of organic-based optoelectronic as well as energy storage devices in the near future.

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High Dielectric Constant Study of TiO₂-Polypyrrole Composites with Low Contents of Filler Prepared byIn SituPolymerization

Cited by 17 publications

References 24 publications

Self‐Targeting, Immune Transparent Plasma Protein Coated Nanocomplex for Noninvasive Photothermal Anticancer Therapy

Self‐Targeting, Immune Transparent Plasma Protein Coated Nanocomplex for Noninvasive Photothermal Anticancer Therapy

Synthesis and Characterization of BaTiO3/Polypyrrole Composites with Exceptional Dielectric Behaviour

Synthesis, characterization and physicochemical studies of copolymers of aniline and 3-nitroaniline

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High Dielectric Constant Study of TiO2-Polypyrrole Composites with Low Contents of Filler Prepared byIn SituPolymerization

Cited by 17 publications

References 24 publications

Self‐Targeting, Immune Transparent Plasma Protein Coated Nanocomplex for Noninvasive Photothermal Anticancer Therapy

Self‐Targeting, Immune Transparent Plasma Protein Coated Nanocomplex for Noninvasive Photothermal Anticancer Therapy

Synthesis and Characterization of BaTiO3/Polypyrrole Composites with Exceptional Dielectric Behaviour

Synthesis, characterization and physicochemical studies of copolymers of aniline and 3-nitroaniline

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High Dielectric Constant Study of TiO₂-Polypyrrole Composites with Low Contents of Filler Prepared byIn SituPolymerization