الفهرس 
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Abstract
Ferrite nanoparticle of ZnxCo1-xAl0.5Fe1.46La0.04O4;0.0≤x≤0.6 has been prepared using flash nitrate autocombustion method. XRD analysis indicatedsingle phase formation of all the samples.TEM morphology clarified that, theparticles have sphericalshapes with rangedsize 12-26nm for the samples with x =0.0 and 0.1 while largequantities of nanowire-bundle filaments was obtained at x=0.2, 0.4, 0.5. The sample Zn0.4Co0.6Al0.5Fe1.46La.04O4 has the highest Curie temperature TC, the highest effective magnetic moment meffand the lowest activation energies whichenhances the use of this nanocomposite in magnetic applications effectively.
The samples ZnxCo1-xAl0.5Fe1.46R0.04O4; (R= La, Sm, pr and Ce) were successfully synthesized in the nanometric scale, with a cubic spinel structureusing the flash autocombustion method.The role of rare earth ions in improving the physical properties of this type of ferrites has been studied. The obtained results were ascribed to therare earth element ionic radius. Lanthanum dopedferrite showed the highest conductivity, highest Curie temperature and lowest effective magnetic moment.
The amplesZn0.5Co0.5Al0.5Fe1.46La0.04O4 has been chosen to be incorpated within different polymeric materials to investigate the effect of different polymer ratios and polymer types on the electric and magnetic properties of (polymer/ferrite) nanocomposites in form of core-shell structure.The conductivity of thecore-shell nanocomposoite sample pVp/ Zn0.5Co0.5Al0.5Fe1.46La0.04O4 with ratio (1:1) showed enhanced conductivity value 7 time more than that of pure ferrite(Zn0.5Co0.5Al0.5Fe1.46La0.04O4), while, the effective magnetic moment decreased by about 50%.Also, there is a notable decrease in the Curie temperature forthecore-shell nanocomposoiteprepared by the use of pVA and pVAc as compared to the value for the pure ferrite.
The investigated samples have been examined to apply on the nanotechnology environmental field. It is obtained that, the sample Zn0.3Co0.7Al0.5Fe1.46La0.04O4 has the highest efficiency to purify theindustry west water.
Allpreparedsamples have been applied to the purification of waste water and de-inking were all samples showed good response in this important environmental problem. The sampleZn0.3Co0.7Al0.5Fe1.46La0.04O4, showed the best waterpurification in group (1), with 94% whileZn0.3Co0.7Al0.5Fe1.46pr0.04O4,showed purification percentage of 90%.The use of polymers in thecore-shell structure resulted in 89%, of waterpurification de coloring of the being 76% in case of sample with x= 0.5.