Electrical conduction in (polyvinyl alcohol/glycogen) blend films

El‐Kader, F. H. Abd; Gaafer, S.A.; Mahmoud, Khaled H.; Mohamed, S.I.; El-Kader, M.F.H. Abd

doi:10.1002/pc.20553

Cited by 12 publications

(11 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In addition, in sample Y4 it is observed that the activation energy increases with the increase in ZnO content. From the Arrhenius behavior the electrical conduction in the PVA/ZnO polymer composite is similar to a semiconductor and this is due to a hopping mechanism between the particles, this trend is similar to the reported works for PVA-Glycogen films [33], and for PVA with Succinic acid composite films [34].…”

Section: Resultssupporting

confidence: 88%

Polymeric Nanocomposites Membranes with High Permittivity Based on PVA-ZnO Nanoparticles for Potential Applications in Flexible Electronics

et al. 2018

View full text Add to dashboard Cite

This study reports the optical, structural, electrical and dielectric properties of Poly (vinyl alcohol) thin films membranes with embedded ZnO nanoparticles (PVA/ZnO) obtained by the solution casting method at low temperature of deposition. Fourier Transform Infrared spectra showed the characteristics peaks, which correspond to O–H and Zn–O bonds present in the hybrid material. The X-ray diffraction patterns indicated the presence of ZnO structure into the films. The composite material showed low absorbance and a wide band of gap energy from 5.5 to 5.83 eV. The surface morphology for the thin films of PVA/ZnO was studied by Atomic Force Microscopy and Scanning Electron Microscopy. The electrical properties of the membranes were also characterized by current-voltage characteristics and the DC conductivity showed Arrhenius behavior with values of activation energy from 0.62 to 0.78 eV and maximum conductivity at 2.4 × 10−12 S/cm. The dielectric properties of the nanocomposites were measured from low to high frequencies, and the results showed a high dielectric constant (ε) in the order of 104 at low frequency and values from ε ≈ 2000 to 100 in the range of 1 KHz–1 MHz respectively. The properties of PVA/ZnO such as the high permittivity and the low temperature of processing make it a suitable material for potential applications in the development of flexible electronic devices.

show abstract

Section: Resultssupporting

confidence: 88%

Polymeric Nanocomposites Membranes with High Permittivity Based on PVA-ZnO Nanoparticles for Potential Applications in Flexible Electronics

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Also, there is qualitative heterogeneity in the scales used by the authors, who create scales for the punctual assessment using variations of the visual analog scale 14,16 . Based on this, what is effective in most studies is the realization of a questionnaire with structured questions 13,17,20,27,30,33 and the consideration of the patient's report as a marker of change 15,18,19,[21][22][23][24][25][26]28,29,31,32 to guide the use of objective tests.…”

Section: Discussionmentioning

confidence: 99%

“…Thirteen (61.90%) studies [13][14][15][16][17]19,21,[25][26][27][28][29][30][31] had a high risk of bias and 8 (38,10%) studies 17,18,20,[22][23][24]32,33 had a low risk due to comparing individuals with changes to healthy individuals in case-control designs. As for applicability, all studies were con-teria listed for this review.…”

Section: Patient Selectionmentioning

confidence: 99%

“…It was considered a low-risk criterion when the reference test was conducted according to the patient's report, without adaptation of the terms by the researchers. As for applicability, 19 (90.48%) studies [13][14][15][16][17][18][19][20][21][23][24][25][26][27][28][29][30][31][32] showed good applicability, and 2 (9.52%) studies 22,33 showed flaws in their applicability. In one of the studies, there was an interpretation of the perceptual responses by the authors 33 , which may distort the data obtained.…”

Section: Index Testmentioning

confidence: 99%

See 1 more Smart Citation

Diagnostic properties of sensitivity changes in patients with maxillofacial fractures

et al. 2021

View full text Add to dashboard Cite

Aim: Verify the accuracy of objective assessments compared to subjective tests in detecting changes in somatosensory perception in individuals affected by maxillofacial trauma. Methods: The review (PROSPERO n ° CRD42019125546) used the databases: MEDLINE, Cochrane, EMBASE, LILACS and other bibliographic resources. Prospective and retrospective studies that used objective and subjective methods of assessing facial sensitivity in maxillofacial fractures were included. There was no restriction on language or publication date. Risk of bias was assessed using the QUADAS-2. Data extraction and analysis were performed using a form developed for the study. Results: 21 studies were included. The clinical objective examination mainly includes assessments of: tactile sensitivity (95.24%) and nociceptive sensitivity (57.14%). The subjective assessment was based on the patient’s report, spontaneously (61.90%), guided by structured questionnaires (33.33%) and/or using scales (9.52%) to measure the degree of impairment. In risk of bias assessment, were observed no adequate interpretation and classification of changes in subjective sensitivity, subject to inappropriate analysis of the data. In addition, the studies bring several instruments without standardization for assessing sensory modalities. Conclusion: The objective assessment is a complement to the subjective assessment, using the touch assessment as the main parameter in the profile of the facial peripheral integrity, associated or not with nociceptive assessment. Lack of consensus on the indication of specific instruments for testing is a limiting factor. Thus, based on the studies, is proposed a minimum battery of sensitivity assessment to obtain an overview of the patient’s peripheral nervous situation.

show abstract

“…To date, research has focused on the space charge dynamics of oil-impregnated insulation paper affected by voltage level, temperature, and moisture (Morshuis and Jeroense 1997;Ciobanu et al 2002;Tang et al 2010;Zhou et al 2009;Liu et al 1998). Although studies have found that many nanoparticles improve the space charge distribution in insulation materials such as polyethylene and polyimide, there are no reports on how to improve the space charge distribution in oil-impregnated insulation paper (Fleming et al 2005;Huang et al 2009;Wang et al 2009;Zha et al 2010;Thelakkadan et al 2011;Abd El-kader et al 2009;Ahmad et al 1992).…”

Section: Introductionmentioning

confidence: 99%

Space Charge Behavior in Oil-Impregnated Insulation Paper Reinforced with Nano-TiO2

Liao¹,

Lv²,

Yang³

et al. 2013

BioResources

View full text Add to dashboard Cite

a Oil-impregnated insulation paper is widely used in power transformers, and the insulation properties of oil-impregnated insulation paper play an important role in the reliability of power equipment. The formation and dynamics of space charge can affect the performance of insulation material. However, methods to improve the space charge distribution in oil-impregnated insulation paper are rarely reported. In this paper, space charge behavior in oil-impregnated insulation paper has been investigated using the pulsed electro-acoustic (PEA) technique. A series of measurements was applied when the oil-impregnated insulation paper reinforced with different nano-TiO 2 contents was subjected to various electric field strengths. The accumulation and decay of space charge are discussed, and the internal electric field strength distribution of oilimpregnated insulation paper is analyzed. The test results show that the space charge distribution is improved and the distortion rate of the internal electric field strength is reduced by adding nano-TiO 2 to the oilimpregnated insulation paper. The results show that the proposed method offers a new way to improve the properties of oil-impregnated insulation paper.

show abstract

Electrical conduction in (polyvinyl alcohol/glycogen) blend films

Cited by 12 publications

References 30 publications

Polymeric Nanocomposites Membranes with High Permittivity Based on PVA-ZnO Nanoparticles for Potential Applications in Flexible Electronics

Polymeric Nanocomposites Membranes with High Permittivity Based on PVA-ZnO Nanoparticles for Potential Applications in Flexible Electronics

Diagnostic properties of sensitivity changes in patients with maxillofacial fractures

Space Charge Behavior in Oil-Impregnated Insulation Paper Reinforced with Nano-TiO2

Contact Info

Product

Resources

About