A study of the physical properties of FeCl3 filled PVA

Tawansi, A.; El‐Khodary, A.; Abdel-Naby, M.

doi:10.1016/j.cap.2004.06.026

Cited by 61 publications

(42 citation statements)

References 33 publications

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“…Several authors [3][4][5][6][7][8] have studied the optical, structural, and other properties of PVA with different dopant like, CuCl 2 , AgNO 3 , MnCl 2 , BaCl 2 , MgBr 2 , and FeCl 3 using different techniques. It was reported that both the type and concentration of the dopant have an influence in changing both properties and structure of the polymer.…”

Section: Introductionmentioning

confidence: 99%

Role of CoBr₂ on the structural, optical and magnetic properties of polyvinyl alcohol films

Elashmawi

Abdelrazek

2009

J of Applied Polymer Sci

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Polyvinyl alcohol (PVA) films filled with different concentrations of CoBr 2 were prepared using the casting method. These films were characterized by FTIR, UVvisible, XRD, and ESR techniques. FTIR spectra were used to clarify the structural variations due to the filling level from CoBr 2 . The observed bands at 3484, 1733, and 1640 cm À1 were assigned to OAH, C¼ ¼O, and C¼ ¼C stretching vibrations, respectively. UV-visible spectra shows the absorption band at 280 nm which is assigned to p ! p* transition. This indicates the presence of unsaturated bonds in tail to head of PVA. Optical energy gap decreased with increasing the concentration of CoBr 2 . X-ray diffraction scans show some decrease in the degree of crystallinity in the filled films which reveals an increase in amorphous phase of PVA due to the interaction between Co þ2 and polymeric matrix causing a molecular rearrangement within the amorphous phase of PVA. The observed complex ESR spectrum due to hyperfine interactions confirms the role of free radicals. Spectroscopic and magnetic properties of PVA/CoBr 2 composite films were investigated and compared with those of PVA alone. The results show that the change of the structure due to the interaction of filler with the polymer.

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Section: Introductionmentioning

confidence: 99%

Role of CoBr₂ on the structural, optical and magnetic properties of polyvinyl alcohol films

Elashmawi

Abdelrazek

2009

J of Applied Polymer Sci

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“…PVA is a plasticizer that helps in the ionic transfer, which, somehow, is involved in diffraction efficiency and it is also possible to add other plasticizers to increase, even more, the diffraction efficiency. The gratings with DC voltage in the exposure process have modulated their diffraction efficiency; this permits some flexibility in the design of holographic gratings [32,33]. This material may have behavioral changes by temperature, because it works as a hydrogel due to PVA and FeCl 3 [34][35][36].…”

Section: Diffraction Efficiency (%)mentioning

confidence: 99%

Voltage Effect in Holograms of Polyvinyl Alcohol with FeCl3

et al. 2014

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Abstract:We show experimentally that the metallic salt, FeCl 3 , at different concentrations, provides photosensitivity and conductivity characteristics with poly(vinyl alcohol) material. The holographic recording in this photosensitive material was made in real time.The effect of applied voltage on holographic diffraction gratings in the recording process and the changes in their diffraction efficiency, depending on their composition, are shown. In addition, we describe the photo-mechanism, physicochemical processes, and water condensations involved in changes of the formation of images due to applied voltage. The results suggest that polymers doped with metallic salts may have potential as inexpensive photosensitive materials that are easy to work under normal laboratory condition.

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“…34 The incorporation of metal chlorides (CoCl 2 , CuCl 2 , and FeCl 3 ) into poly(vinyl chloride) (PVC) and PVA produced intensity changes in infrared absorption bands of the polymers and resulted in a 10 6 -fold increase in the electrical conductivity of the films. [40][41][42] These effects resulted in a new, specific metal-polymer interaction, for which a model based on strong electrical coupling between the metal atoms and polar CACl and CAOH bonds of PVC and PVA, respectively, was presented. 41,42 The electrical characteristics of Shottky diodes are generally related by its interface quality.…”

Section: Introductionmentioning

confidence: 99%

“…[40][41][42] These effects resulted in a new, specific metal-polymer interaction, for which a model based on strong electrical coupling between the metal atoms and polar CACl and CAOH bonds of PVC and PVA, respectively, was presented. 41,42 The electrical characteristics of Shottky diodes are generally related by its interface quality. The existence of such an interfacial layer can have a strong influence on the diode characteristics.…”

Section: Introductionmentioning

confidence: 99%

Negative dielectric constant and electrical conductivity of Au/n‐Si (111) Schottky barrier diodes with PVA/Ni,Zn interfacial layer

Tunç

Dökme

Altındal

et al. 2011

J of Applied Polymer Sci

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In this study, the dielectric properties and alternating-current (ac) conductivity of Au/(PVA/Ni,Zn acetates)/n-Si Schottky diodes (SDs) were determined by the measurement impedance technique. Dielectric properties and electrical conductivity of Au/(PVA/Ni,Zn acetates)/n-Si SDs in the frequency range of 0.5 kHz to 10 MHz and voltage range of À2 to 5 V were investigated in detail using experimental C-V and G-V measurements. Experimental results show that the values of the dielectric constant (e 0 ), dielectric loss (e 00 ), and tan d obtained from the measured capacitance and conductance have been a strong function of frequency and applied voltage, and the values of e 0 have been unexpectedly found to be negative, especially at high voltages. Other parameters of Au/(PVA/Ni,Zn acetates)/n-Si SDs, such as ac electrical conductivity (r ac ), the real part of electric modulus (M 0 ), and the imaginary part of electric modulus (M 00 ) varied with changing frequency for various voltages. The main propose of this study is to discuss the polymeric interfacial layer at metal and semiconductor affect and probe the dielectric properties of Au/(PVA/ Ni,Zn acetates)/n-Si SDs regarding the negative capacitance as a function of frequency and voltage. V C 2011 Wiley Periodicals, Inc. J Appl Polym Sci 122: [265][266][267][268][269][270][271][272] 2011

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A study of the physical properties of FeCl3 filled PVA

Cited by 61 publications

References 33 publications

Role of CoBr₂ on the structural, optical and magnetic properties of polyvinyl alcohol films

Role of CoBr₂ on the structural, optical and magnetic properties of polyvinyl alcohol films

Voltage Effect in Holograms of Polyvinyl Alcohol with FeCl3

Negative dielectric constant and electrical conductivity of Au/n‐Si (111) Schottky barrier diodes with PVA/Ni,Zn interfacial layer

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A study of the physical properties of FeCl3 filled PVA

Cited by 61 publications

References 33 publications

Role of CoBr2 on the structural, optical and magnetic properties of polyvinyl alcohol films

Role of CoBr2 on the structural, optical and magnetic properties of polyvinyl alcohol films

Voltage Effect in Holograms of Polyvinyl Alcohol with FeCl3

Negative dielectric constant and electrical conductivity of Au/n‐Si (111) Schottky barrier diodes with PVA/Ni,Zn interfacial layer

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Role of CoBr₂ on the structural, optical and magnetic properties of polyvinyl alcohol films

Role of CoBr₂ on the structural, optical and magnetic properties of polyvinyl alcohol films