Publications

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Volume 1, Issue 2 (Jul–Aug 2014)

Influence of Field Assisted Chemical Spray Pyrolysis Deposition Technique on the Structural and Optical Properties of CdS Thin Films 

Original Research Article

Journal of Chemistry and Materials Research Vol. 1 (2), 2014, 23–27

U.U. Iwok*, J.A. Bwamba, N.O. Alu, K.K. Adama, Z. Abdullahi, A.C. Egba, A.A. Oberafo, B.O. Akogwu


Abstract

In this paper, we report the preparation and characterization of CdS films prepared by field assisted chemical spray pyrolysis deposition technique. The effect of the deposition process parameters was investigated with respect to its influence on the structural and optical properties of CdS thin films. The films were prepared by depositing aqueous solutions of cadmium acetate and thiourea on to a soda-lime glass substrate at a substrate temperature of 300 °C. The as-deposited films were characterized using X-ray diffraction (XRD) technique to investigate the crystallographic structure and grain size of the films while the optical properties of the thin films were determined using Avantes single beam UV-VIS-NIR unpolarized direct incidence spectrophotometer giving a transmittance and absorbance spectrum plot in the wavelength range of 200 – 800 nm. The result of the structural study revealed that the films obtained had polycrystalline hexagonal structure which was consistent with that obtained for other deposition techniques. It also showed a peak at the 2θ position of 26.4148° with a FWHM of 0.9216° and d-spacing of 3.37101A° while estimation of the optical band gap showed a cutoff on the absorption versus wavelength spectra at the 533.3nm position which gave an energy bandgap of 2.33eV.

Keywords: Field assisted chemical Spray Pyrolysis; Structural properties; Optical properties; CdS thin films


Received
Received in revised
Accepted
19 May 2014
24 July 2014
04 August 2014
 

Utilization of Ca–Lignosulphonate Prepared From Black Liquor Waste as a Cement Superplasticizer Original Research Article

Original Research Article

Journal of Chemistry and Materials Research Vol. 1 (2), 2014, 28–34

H. H. M. Darweesh*


Abstract

The preparation of calcium lignosulphonate (LS), its application as a superplasticizer (SP) and its influence on normal consistency, fluidity, setting and strength development of Portland cement-silica fume pastes were investigated. Results showed that the water of consistency increases with silica fume content, but decreases in the presence of LS. Water reduction due to superplasticizer increases with the dose. Setting times (initial and final) elongated with LS dose up to 0.4 % and then became nearly constant. The increase of silica fume content in superplasticized mixes increases the fluidity, especially with high SP dose (0.4 and 0.6 wt. %), and hence the gap of water reduction increases. Also, the combined water content and compressive strength of the OPC pastes enhanced with silica fume incorporation up to 9% SF mixes after which the extra dose had no significant or bad effect. Diffrtrntial thermal Analysis (DTA) showed that the free lime content of the LS-containing pastes decreased due to its consumption through the pozzolanic reactivity of silica fume. Scanning electron microscopy (SEM) elucidated the well crystallized and morphological change of the formed binder (CSH) compared with those of the control mix.

Keywords: OPC; silica fume; superplasticizer; fluidity; setting; strength; DTA; SEM.

Received

Received in revised
  Accepted
14 July 2014
07 August 2014
09 August 2014
 

Numerical steady of laminar flow over two–dimensional obstacle

Original Research Article

Journal of Chemistry and Materials Research Vol. 1 (2), 2014, 35–39

Salim Gareh*


Abstract

A numerical investigation is conducted in a rectangular channel with obstacle mounted on the lower wall. Time-independent two dimensional laminar flow with constant thermophysical properties is assumed for air at different values of the Reynolds number (100, 400, 700, 1200 and 1800). A detailed analysis is carried out to investigate flow pattern and Nusselt number. It is also found that a travelling wave generated by the vortex shedding contributes mainly to heat transfer enhancement.

Keywords: laminar flow; obstacle; finite volume simulation; convective heat transfer.


Received
  Received in revised
Accepted
02 July 2014
05 August 2014
09 August 2014
 

Microbial Analysis on Some Coordination Compound of Metals with Ampicillin

Original Research Article

Journal of Chemistry and Materials Research Vol. 1 (2), 2014, 40–44

Pranay Guru*

Abstract

The present paper deals with the microbial studies of the complex Co(II) and Zn(II) with antibiotic drug ampicillin, a formula Co(C16H19N3O4S)2MoO4, 3H2O and Zn(C16H19N3O4S)2MoO4, 4H2O has been suggested on the basis of elemental analysis and molar conductance for the newly synthesized complex. The microbial studies of synthesized complex were studied on pathogenic bacteria using gram + ve (Bacillus subtilis and Staphylococcus aureus) and gram – ve (Shigella flexneri, Salmonella typhosa, Escherichia coli) and some fungi (Aspergillus flavus, Fusarium oxysporum, Chrysosporium pannicale, Alternaria solani, Candida albicans ).

Keywords: Bacillus subtilis; Staphylococcus aureus; Aspergillus flavus; Fusarium oxysporum; Chrysosporium pannicale; Alternaria solani; Candida albicans.

Received
   Received in revised
   Accepted

22 Jun 2014

07 August 2014
   09 August 2014
 

Determination of Impurities Generation in 10–DAB by XRD, 1HNMR and 13C–NMRon Storage for 10 Years

Original Research Article

Journal of Chemistry and Materials Research Vol. 1 (2), 2014, 44–51

Omprakash H. Nautiyal*

Abstract

10-DAB being very important and is the fifth precursor in the biosynthesis of Paclitaxel in the Taxus species. 10-DAB is isolated from the Yew tree of American origin namely Taxus baccata, employing methylene dichloride for obtaining the syrupy liquid. The extraction was carried out at the vapour pressure of the MDC until the matrixes get exhausted for its contents. The syrup is then was admixed with the silica gel and vacuum dried. The vacuum dried silica admixed syrup is then loaded into the column containing the silica gel of mesh size of 60-120 of acidic pH. It is then subsequently eluted for its resolving the lower and higher fractions of impurities. The pure 10-DAB then successfully eluted with suitably increasing polarity of acetone: hexane mixture until the pure 10-DAB is obtained. The entire fractions were distilled under rotary evaporator to obtain the pure residue. It was then subsequently crystallized using hexane to yield 99.5% purity of 10-DAB. It was stored under ambient conditions of 35±5oC for 10 years and was analyzed for determining the impurities generation employing the XRD, 1HNMR and 13CNMR. The investigation shows no impurities found to be generated.

Keywords: 10-DAB, storage, impurities generation, XRD, 1HNMR, 13NMR.

Received
   Received in revised
   Accepted

 14 July 2014

   05 August 2014
   09 August 2014