Archives

Volume 2 Number 7 July 2017

Synthesis of Novel Fibrous Cerium Phosphate-Silver-Polyethylene Nanocomposites for Antibacterial Applications


Authors: S. K. Shakshooki ; N. Greesh ; R. Alghazeer ; F. Hebail ; A. Elhamadi ; A. Elouzi ; W. Elharari ; A. Shebani
Pages: 65-73
Abstract
Fibrous cerium phosphate silver nanocomposite , Ce(H)0.7 (PO4)2(Ag)1.3. 2.97H2O(CePAg), was prepared by ion exchange method  from reaction of Ce(HPO4)2.2.9H2O(nCePf)  with 0.1M AgNO3  in 0.1M HNO3 solution. Fibrous cerium phosphate-silver nanocomposite(CePAg) was dispersed in polyethylene by  melt process using twin extruder at different loading : 2 , 5 and 10 %  in wt., with respect to polyethylene(PE), to obtain  cerium phosphate-silver-polyethylene nanocomposites (CePAg-PE). The resultant products were characterized by FTIR, XRD, SEM and  TGA.  The antimicrobial resistance of CePAg–PE was studied by measuring the diameter of inhibition zone of growths of Escherichia coli and Salmonella typhimurium. The results showed that CePAg-PE exhibited efficacy in the inhibition of bacterial growth especially at 10 w% content.

Molar Conductivities, Salinity and Total Dissolved Solids of KBr and KCl in Aqueous Solution


Authors: Maduelosi N. J. ; Bagshaw  A. P. ; Ekezie C. M.
Pages: 61-64
Abstract
The molar conductivity, salinity and total dissolved salt (TDS), were measured using electrical conductivity meter (Extech instrument DO 700). Different concentrations of KBr and KCl solutions (0.01, 0.02, 0.03, 0.04, 0.05 M)l were prepared separately by dissolving appropriate amount of each salt in distilled water. The results obtained showed that the molar conductivities, salinity and total dissolved solid values of KBr were higher than that of KCl. This observation was attributed to change in concentration, ion-solvent interactions, solubility and ionic size effects. The limiting molar conductivity at infinite dilution was determined graphically.