Frequency‐dependent conductivity of interpenetrating polymer network composites of polypyrrole–poly(vinyl acetate)

Bhattacharyya, Souvik; Saha, Shyamal Kumar; Chakravorty, Manotosh; Mandal, Broja M.; Chakravorty, D.; Goswami, K.

doi:10.1002/polb.1168

Cited by 31 publications

(8 citation statements)

References 22 publications

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“…Following the procedure described by Bhattacharya et al,57 the s values as a function of frequency for each measured temperature were obtained. It is noted that to evaluate the exponent s , only frequencies above the region where the earlier discussed relaxation process appears, were considered.…”

Section: Resultsmentioning

confidence: 99%

Expression of the novel Golgi protein GoPro49 is developmentally regulated during mesenchymal differentiation

Takatalo

Järvinen

Rönnholm

2008

Developmental Dynamics

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The Golgi complex is the major cell organelle responsible for protein glycosylation and secretion. In this article, we show that GoPro49 is a new gene expressed specifically in mesenchymal and cartilaginous tissues during development. The corresponding human homologue was identified in our previous Golgi proteomics study and was shown to localize to the Golgi complex as an EGFP-fusion protein. Furthermore, we show using in situ hybridization that GoPro49 expression pattern is both restricted and developmentally regulated. It is specific in vertebrae, ribs, and limbs, and in the craniofacial area in nasal septum and dental follicle. In the trunk, GoPro49 expression decreases before final chondrocyte differentiation, while in the craniofacial area expression is still observed in postnatal tissues. This is the first time a Golgi membrane protein is shown to be expressed in a developmentally regulated manner during mesenchymal and cartilage development in mammals. Developmental Dynamics 237:2243-2255, 2008.

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Section: Resultsmentioning

confidence: 99%

Expression of the novel Golgi protein GoPro49 is developmentally regulated during mesenchymal differentiation

Takatalo

Järvinen

Rönnholm

2008

Developmental Dynamics

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“…The following formulae were used to determine the AC conductivity as follows: [ 40 , 41 , 42 , 43 ]:

…”

Section: Resultsmentioning

confidence: 99%

Enhancement in the Structural, Electrical, Optical, and Photocatalytic Properties of La2O3-Doped ZnO Nanostructures

et al. 2022

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A lanthanum oxide (La2O3)-ZnO nanostructured material was synthesized in the proposed study with different La2O3 concentrations, 0.001 g to 5 g (named So to S7), using the combustion method. X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transformation infrared spectroscopy (FT-IR) were utilized for investigating the structure, morphology, and spectral studies of the La2O3- ZnO nanomaterials, respectively. The results obtained from previous techniques support ZnO’s growth from crystalline to nanoparticles’ fine structure by changing the concentrations of lanthanum oxide (La2O3) dopants in the host matrix. The percentage of ZnO doped with La- influences the ZnO photocatalytic activity. SEM analysis confirmed the grain size ranged between 81 and 138 nm. Furthermore, UV-Vis diffuse reflectance spectroscopy was performed to verify the effects of La2O3 dopants on the linear optical properties of the nano-composite oxides. There was a variation in the energy bandgaps of La2O3-ZnO nanocomposites, increasing the weight concentrations of lanthanum dopants. The AC electrical conductivity, dielectric properties, and current–voltage properties support the enactment of the electrical characteristics of the ZnO nanoparticles by adding La2O3. All the samples under investigation were used for photodegradation with Rhodamine B (RhB) and Methylene Blue (MB). In less than 30 min of visible light irradiation, S4 (0.5 g) La2O3-ZnO reached 99% of RhB and MB degradation activity. This study showed the best photocatalytic effect for RhB and MB degradation of 0.13 and 0.11 min−1 by 0.5 g La2O3-ZnO. Recycling was performed five times for the nanocatalysts that displayed up to 98 percent catalytic efficiency for RhB and MB degradation in 30 min. The prepared La2O3-ZnO nanostructured composites are considered novel candidates for various applications in biomedical and photocatalytic studies.

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“…It is significant to investigate the frequency influences on the AC electrical conductivity to describe the Er2O3-ZnO nanocomposite materials' conduction mechanism at different Erbium doping ratios. To compute the AC conductivity of the material under process, the next equations were applied (Murowski and Barczynski 1995;Bhattacharyya et al 2001;Jali et al 2007;Bobnar et al 2004):…”

Section: Optical Diffused Reflectance (Odr)mentioning

confidence: 99%

Multifunctional and smart Er2O3–ZnO nanocomposites for electronic ceramic varistors and visible light degradation of wastewater treatment

AlAbdulaal

AlShadidi

Hussien

et al. 2021

Preprint

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In this proposed study, Erbium (Er3+)-doped ZnO nanocomposites were prepared through the effective, basic, and green combustion method. The significant effects of Er-dopants on the structural, morphological features, dielectric and optical behaviors of the pure ZnO matrix as well as Er2O3–ZnO nanostructured materials were investigated applying X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transformation Infrared spectroscopy (FTIR), and UV–Vis spectrophotometer techniques. These results showed that the synthesized Er2O3–ZnO nanocomposites are well polycrystalline. The Er2O3–ZnO nanocomposites are almost uniformly distributed on the surface morphologies. Furthermore, UV-Vis diffuse reflectance spectroscopy, AC electrical conductivity, and dielectric properties' current-voltage characteristics were utilized to examine the influence of erbium-doping on the optical properties, energy bandgaps of the proposed Er2O3–ZnO nanostructured powder. The tested nano-samples were applied for the visible light photodegradation of p-chlorophenol (4-CP) and p-nitrophenol (4-NP). The Er-doped ZnO ratio affects the photocatalytic activity of the ZnO matrix. This current research substantiated that more than 99.5% of 4-CP and 4-NP were photodegraded through 30 min of irradiation. Four times, the Er: ZnO nanocatalysts were used and still displayed an efficiency of more than 96.5% for 4-CP and 4-NP degradations in the specified period = 30 min. The as-prepared Er2O3-ZnO nanostructured are considered novel potential candidates in broad nano-applications from visible photocatalytic degradation of waste pollutants to the electronic varistor devices.

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Frequency‐dependent conductivity of interpenetrating polymer network composites of polypyrrole–poly(vinyl acetate)

Cited by 31 publications

References 22 publications

Expression of the novel Golgi protein GoPro49 is developmentally regulated during mesenchymal differentiation

Expression of the novel Golgi protein GoPro49 is developmentally regulated during mesenchymal differentiation

Enhancement in the Structural, Electrical, Optical, and Photocatalytic Properties of La2O3-Doped ZnO Nanostructures

Multifunctional and smart Er2O3–ZnO nanocomposites for electronic ceramic varistors and visible light degradation of wastewater treatment

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