Publications

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Volume 2, Issue 2, (March – April 2015)

Electrochemical Corrosion of 42CrMo4 Steel Nitrided with different Impedance Parameters

Original Research Article

Journal of Chemistry and Materials Research Vol. 2 (2), 2015, 39–41

Abdelouahed Chala, Abderrazek Darsouni, Okba Belahssen*, Said Benramache


Abstract

This paper presents corrosion behavior of alloy 42CrMo4 steel nitrided by plasma. Different samples nitrided were tested. The corrosion behavior was evaluated by electrochemical impedance spectroscopy and the tests were carried out in acid chloride solution 1M. The best corrosion protection was observed for samples nitrided. The aim of this work is to compare equivalents circuits corresponding to Nyquist curves simulated and experimental and select who gives best results of impedance parameters with lowest error.

Keywords: ion nitriding; steel 42CrMo4; eis.


Received
Accepted
02 February 2015
27 February 2015
 

Sensitive Spectrophotometric and Conductometric Methods for Determination of Candesartan Using Bromocresol Green and Bromocresol Purple by Ion-Pair Complex Formation

Original Research Article

Journal of Chemistry and Materials Research Vol. 2 (2), 2015, 42–48

Alaa S. Amin*, Hanna M. Salah, Gamal H. Ragab and Inass S. Kamel


Abstract

Two simple, sensitive, accurate, rapid spectrophotometric and conductometric methods were developed for the determination of candesartan (CAND) in pure and in its pharmaceutical preparation. The proposed methods depend upon the reaction of bromocresol green (BCG) or bromocresol purple (BCP) with candesartan in phosphate buffered solution to form stable colored ion-pair complex, which was extracted in chloroform. The yellow colored complexes were determined at λmax 415, 405 nm with BCG, BCP, respectively. Using conductometric titration, candesartan could be evaluated in acetone. The optimizations of various experimental conditions were described. The results obtained showed good recoveries of 100.14 with relative standard deviations of 0.62. Applications of the proposed methods to representative pharmaceutical formulations are successfully presented compared with official methods.

Keywords: Candesartan determination; Ion-pair complex, Spectrophotometry, Conductometry, Dosage forms.



Received

  Accepted
07 February 2015
08 March 2015
 

Study of Conduction Cechanisms in CuO Doped Borotellurite Glasses

Original Research Article

Journal of Chemistry and Materials Research Vol. 2 (2), 2015, 49–53

T. Sujatha, T. Sankarappa*, J.S. Ashwajeet, R. Ramanna, S.M. Hanagodimath


Abstract

Borotellurite glasses, (CuO)x–(B2O3)(0.2) – (TeO2)(0.8-x), (x=0.1, 0.2, 0.3, 0.4 and 0.5) were prepared by melt quenching technique. Density and conductivity as a function of temperature has been measured. Density decreased up to 0.4 mole fractions of CuO and increased for 0.5. By employing Mott’s small polaron hopping model, activation energy for conduction has been determined. Activation energy decreased with increase in CuO content up to 0.4 mole fractions and increased for further increase in CuO. Conductivity behaved in the opposite fashion to that of activation energy with CuO concentration. Conductivity data deviated from SPH model has been viewed in the light of Mott’s Variable Range Hopping model and the density of states at Fermi level were determined and compared with the literature. Various physical and polaron hopping parameters such as transition metal ion density, polaron hopping distance, hopping energy, polaron binding energy and polaron radius have been determined. For the first time CuO doped borotellurite glasses in the present compositions were probed for conduction mechanisms and various associated polaron parameters were determined.

Keywords: Borotllurite glasses, Conductivity, Polaron hopping, Activation energy, Density of states.



Received
Accepted
20 December 2014
20 March 2015
 

Chelation of Iron(II) and Copper(II) by Antiparkinsonian drugmolec-ules; levodopa and its analogs

Original Research Article

Journal of Chemistry and Materials Research Vol. 2 (1), 2015, 54–58

Tehmina Fiaz, Nasreen Fatima, Syed Zafar Abbas Zaidi* and Shazia Nisar


Abstract

Dihydroxy phenyl alanine is commonly known as Levodopa (LD). Which is a dopamine analog present in antiparkinsonian (neurodisorder) drugs. Dopamine contains catecholic functional group due to which it is liable to interact with substances present in the physiological system. Iron and Copper have significant role in normal function of brain. The Chelation of these Bio‒Essential Metals with Levodopa and its analogs Carbidopa (CD) and Methyldopa (MD) was studied at 30 ± 2 °C. Fe2+ formed intense color complex with these molecules with an absorbance maxima in visible region. A distinct peak of Fe‒Carbidopa complex at 364 nm was observed while that of Fe‒Levodopa and Fe‒methyldopa are obsereved at 730 nm. Whereas Cu+2–CD showed absorbance maxima at 525 nm. Cu+2‒LD and Cu+2‒MD did not show any significant absorbance in visible region so its interaction is studied using only potentiometric technique. Potentiometric studies provide evidence for chelation of Fe2+ and Cu2+ with dopamine molecules. Stoichiometry of Fe(II) with these dopamine analogs has been explored which shows that Fe(II) forms a 1:3 complex with all the investigated dopamine analogs. Using this fact of chelation estimation of Fe and Cu in a real Sample is possible by using Dopamine molecules. The Iron overloading can also be treated using these dopamines. This metal to drug interaction might disturb the Iron and Copper bioavailability. Secondly it might affect the efficacy of the administered drug so it is recommended that Iron supplement should not be taken along with medication for Parkinson’s.

Keywords: Dopamines; Iron; Copper; Chelation; Stoichiometry; Potentiometry.


   Received
Accepted
07 January 2015 
23 March 2015
 

Fabrication and Characterisation of ZnO Thin Film by Sol–Gel technique

Original Research Article

Journal of Chemistry and Materials Research Vol. 2 (2), 2015, 59–62

Said Benramache*, Salim Gaerh, Boubaker Benhaoua, Abderrazek Darsouni, Okba Belahssen, Hachemi Ben Temam


Abstract

We investigated the structural and optical properties of zinc oxide (ZnO) thin film as the n-type semiconductor. In this work, the sol–gel method used to fabricate ZnO thin film on glass substrate with 0.5 mol/l of zinc acetate dehydrate. The crystals quality of the thin film analyzed by X-ray diffraction abd the optical transmittance was carried out by Ultraviolet-visible spectrophotometer. The DRX analyses indicated that ZnO film have polycrystalline nature and hexagonal wurtzite structure with (002) preferential orientation and the measured average crystallite size of ZnO of 207.9 nm. The thin film exhibit an average optical transparency about 90 %, in the visible region, found that optical band gap energy was 3.282 eV, the Urbach energy also was calculated from optical transmittance to optimal value is 196.7 meV.

Keywords: ZnO; Thin film; Sol–Gel technique.


Received
   Accepted 
10 April 2015
   03 May 2015
 

Interplay Between Acoustic Properties of Technetium and Nitrides

Original Research Article

Journal of Chemistry and Materials Research Vol. 2 (2), 2015, 62–66

Pramod Kumar Yadawa*


Abstract

We study the interplay comprehensive computation of second- and third- order elastic constants using Lennard-Jones potential and then velocities and attenuation of acoustics waves in hexagonal structured Tc and TcN subnitride. The comparison of these computed results has been made with available theoretical and experiment results. The orientation dependent acoustic velocity has been also evaluated to study the anisotropic behaviour of these compounds. The inconsistent behaviour of angle-dependent velocities is associated to the action of second order elastic constants. The average sound velocity is a direct consequence of Debye temperature, specific heat and thermal energy density of these compounds. The mechanical properties of Tc are better than those of Technetium nitride, because technetium has high ultrasonic velocities and low attenuation. Obtained results, together with other well known physical properties, may expand future prospects for the applications and study of these materials.

Keywords: Elastic constants; longitudinal waves; surface waves; ultrasonic velocity.

Received
Accepted
07 April 2015
03 May 2015
 

Multiplicative Versions of Zagreb Indices of TUSC4C8(S) Nanotubes

Original Research Article

Journal of Chemistry and Materials Research Vol. 2 (2), 2015, 67–70

Mohammad Reza Farahani*

Abstract

The first Zagreb index of a graph G, with vertex set V(G) and edge set E(G), is defined M1(G)=dv2 where dv denotes the degree of the vertex v. And the second Zagreb index of G is defined M2(G)=(dv×dv). We consider G=TUSC4C8(S) Nanotubes and also determine exact formulas of the multiplicative version of Zagreb indices for this Nanotubes.

Keywords: Zagreb indices; Multiple Zagreb indices; Nanotubes.



Received 
Accepted 
10 February 2015
   08 May 2015