Drastic effects of fast neutrons and γ-irradiation on the DC conductivity of Co-, Ni-, Mn- and Ag-gelatin doped films

Hanafy, T. A.

doi:10.1016/j.cap.2007.09.002

Cited by 25 publications

(15 citation statements)

References 25 publications

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“…In other words, rare earth ions may reside at amorphous-crystalline boundaries and diffuse preferentially, via heating, through the amorphous regions of the sample and thus form a charge transfer within the polymeric chains. 9,21 All these factors play an important role for increasing of e 0 of the doped PVA samples. 15 Figs.…”

Section: -2mentioning

confidence: 99%

“…The values of E a indicate that the ionic conduction mechanism is predominant for the investigated samples. 9 The M 00 curves at various temperatures can be reduced to a master curve with the peak position (f max ) and the peak height (M 00 max ) for arelaxation process. Figs.…”

Section: -6mentioning

confidence: 99%

“…Polyvinyl alcohol (PVA) anions are suitable bridging ligands for constructing network coordination polymers. 5,6,[8][9][10] PVA is a semi-crystalline polymer and its crystalline index depends on the synthetic process and physical aging. 8 It has gained increasing attention in the biomedical field due to bioinertness.…”

Section: Introductionmentioning

confidence: 99%

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Dielectric relaxation and alternating current conductivity of lanthanum, gadolinium, and erbium-polyvinyl alcohol doped films

Hanafy¹

2012

Journal of Applied Physics

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Fourier transform infrared (FTIR) spectrum dielectric constant, e 0 , loss tangent, tan(d), electric modulus, M*, and ac conductivity, r ac , of pure polyvinyl alcohol (PVA) as well as La-, Gd-, and Er-PVA doped samples have been carried out. The dielectric properties have been studied in the temperature and frequency ranges; 300-450 K and 1 kHz-4 MHz, respectively. FTIR measurements reveal that La 3þ , Gd 3þ , and Er 3þ ions form complex configuration within PVA structure. Two relaxation processes, namely, q and a were observed in pure PVA sample. The first process is due to the interfacial or Maxwell-Wagner-Sillers polarization. The second one is related to the micro-Brownian motion of the main chains. For doped PVA samples, a-relaxation process splits into a a and a c . This splitting is due to the segmental motion in the amorphous (a a ) and crystalline (a c ) phases of PVA matrix. Electric modulus analysis was discussed to understand the mechanism of the electrical transport process. The behavior of ac conductivity for all PVA samples indicates that the conduction mechanism is correlated barrier hopping. V C 2012 American Institute of Physics. [http://dx

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Section: -2mentioning

confidence: 99%

Section: -6mentioning

confidence: 99%

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Dielectric relaxation and alternating current conductivity of lanthanum, gadolinium, and erbium-polyvinyl alcohol doped films

Hanafy¹

2012

Journal of Applied Physics

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“…26 To a solution of 2,7-di-tert-butylpyrene 1 (10 mmol) in CH 2 Cl 2 (40 mL) and CH 3 CN (40 mL) were added NaIO 4 (17.5 g, 81.8 mmol), H 2 O (50 mL), and RuCl 3Á xH 2 O (0.25 g, 1.2 mmol). The dark brown suspension was heated at [30][31][32][33][34][35][36][37][38][39][40] C overnight. The reaction mixture was poured into 500 mL of water, and the organic phase was separated.…”

Section: à6mentioning

confidence: 99%

Dielectric properties of new fully conjugated 2H‐ and metal‐pyrazinoporphyrazine network polymers

Abdel-Razik

El-Sayed

Hassen

2011

J of Applied Polymer Sci

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2,7-Di-tert-butylpyrene was oxidized to 2,7-di-tert-butylpyrene-4,5,9,10-tetraone. The latter through condensation reaction with vicinal diamine such as diaminomaleodinitrile afforded heterocyclic monomer, 2,7-di-tert-butyl pyrene [4,5][9,10]bis(2,3-pyrazine-5,6-dinitrile), which was cyclotetramerized to the corresponding 2H-and metal-pyrazinoporphyrazine-based network polymers (2H-PyzPz and M-PyzPz, M ¼ Co, Ni, Zn, or Cu). Elemental analytical results, Infrared, and NMR spectral data of the new prepared molecules are consistent with their assigned formulations. Molecular masses and metal contents of the synthesized polymers proved to be of high molecular masses, which confirm the efficiency of tetramerization polymerization and complexation reactions. Dielectric permittivity, e 0 , loss tangent, tan d, and ac conductivity, rac(x), of 2H-PyzPz and M-PyzPz films were studied as a function of temperature and frequency. It was found that dielectric permittivity, e 0 , decreases with the increase of frequency and increases with the increase in temperature. Ac conductivity, rac(x), is found to vary as Bxs and the frequency exponent, s, is less than unity around room temperature indicating a dominant hopping process. On the other hand, rac(T) of all samples is thermally activated with low activation energies.

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“…The behavior of dc conductivity in regions (I and II) can be described according to Arrhenius equation [17,22]:…”

Section: Conductivitymentioning

confidence: 99%

Transient and Steady State Currents of Bisphenol A Corncobs Sample

Hanafy¹

2011

AMPC

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Transient current (I-t), current-voltage (I-V) characteristics, and dc conductivity ln(σ) for bisphenol A corncobs (BPACC) sample were investigated. At higher temperatures, I-V characteristics reveal that the dc current for the sample undergoes two regions one due to ohmic conduction and the other has been attributed to Space charge limited current (SCLC). The activation energy (E a ), the electron mobility (μ o ), effective electron mobility (μ e ), the concentration of the charge's concentrations in conduction band, trapping factor (θ) and the trap concentration (N t ) were calculated. At lower temperatures, the dc current exhibits a peculiar behavior for I-t regime and I-V characteristics. Transient current of BPACC sample exhibits approximately constant value at constant electric field and it has saturation value for I-V characteristics. The attained results suggest strongly the applicability of this material in the electrical applications.

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Drastic effects of fast neutrons and γ-irradiation on the DC conductivity of Co-, Ni-, Mn- and Ag-gelatin doped films

Cited by 25 publications

References 25 publications

Dielectric relaxation and alternating current conductivity of lanthanum, gadolinium, and erbium-polyvinyl alcohol doped films

Dielectric relaxation and alternating current conductivity of lanthanum, gadolinium, and erbium-polyvinyl alcohol doped films

Dielectric properties of new fully conjugated 2H‐ and metal‐pyrazinoporphyrazine network polymers

Transient and Steady State Currents of Bisphenol A Corncobs Sample

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