AMONG THE VARIOUS METHODS FOR THE PREPARATION OF THE NANOMATERIALS, USE OF MICROEMULSIONS IS ONE OF THE RELATIVELY ALL-ROUND TECHNIQUE, WHICH HAS THE ABILITY TO CONTROL THE PROPERTIES SUCH AS SIZE, SHAPE, MORPHOLOGY, SIZE DISTRIBUTION AND SURFACE AREA OF THE SYNTHESIZED NANOPARTICLES. THE PREPARATION OF THE VARIOUS TYPES OF Core-shell NANOPARTICLES BY THIS METHOD HAS BEEN REPORTED [1].DURING THE RECENT YEARS, USE OF UREA-FORMALDEHYDE RESIN (UF) AS THE shell MATERIAL IN THE PREPARATION OF THE MICROCAPSULES USED FOR DIFFERENT PURPOSES SUCH AS CONTROLLED DRUG RELEASE, FOOD ADDITIVES, COATINGS, PAINTS, CATALYSTS, SELF-CLEANING SURFACES, AND ELECTRONIC INKS HAS BEEN GAINED A GREAT ATTENTIONS. INSIDE MICROCAPSULES WERE FILLED WITH SUBSTANCES SUCH AS DRUGS, OILS, VARIOUS REAGENTS AND ETC, WHICH WERE PROTECTED BY THE shell MATERIAL FROM ENVIRONMENTAL DAMAGES AND CAN BE RELEASED IN CONTROLLED WAY AND IN DESIRED MEDIA. [2].THE AIM OF THE PRESENT WORK IS TO PREPARE HYBRID Core-shell NANOPARTICLES WITH TIO2 Core AND UF RESIN AS shell MATERIAL VIA TWO MICROEMULSIONS TECHNIQUE. STARTING WITH COMMERCIAL TIO2 NANOPARTICLES BY USING TWO MICROEMULSIONS METHOD, UREA AND FORMALDEHYDE MONOMERS CONTAINED INSIDE OF ADEQUATE MICELLES WERE POLYMERIZED OVER THE TIO2 NANOPARTICLES TO OBTAIN TIO2 NANOPARTICLES ENCAPSULATED INSIDE OF UF RESIN. IT IS EXPECTED THAT THE PRODUCT OF THIS METHOD MAY EXHIBIT A GOOD STABILITY AND UNIFORM SIZE DISTRIBUTION OF THE MICROCAPSULES.THE PREPARED Core shell NANOPARTICLES WILL BE CHARACTERIZED VIA ADEQUATE TECHNIQUES SUCH AS SCANNING ELECTRON MICROSCOPY (SEM) OR TRANSMISSION ELECTRON MICROSCOPY (TEM) AND ALSO SPECTROSCOPIC TECHNIQUES SUCH AS UV-VIS, FT-IR AND THERMAL ANALYSIS TECHNIQUES SUCH AS DSC AND TGA, AND THEIR structure WILL BE CONFIRMED.

IN THIS STUDY, CO@RU/G-AL2O3 Core shell CATALYST WAS SUCCESSFULLY SYNTHESIZED VIA SURFACE DISPLACEMENT REACTION. THIS ROUTE WAS INCLUDING REDUCTION OF CO Core BY NABH4 ON THE SUPPORT AND THEN SUBSTITUTION OF CO SPECIES WITH RU. THE CATALYSTS WERE CHARACTERIZED WITH TECHNIQUES X-RAY DIFFRACTION (XRD), HIGH RESOLUTION TRANSMISSION ELECTRON MICROSCOPY (HRTEM), TEMPERATURE PROGRAMMED REDUCTION (TPR). USING CO@RU/G-AL2O3 CATALYST SHOWED THE REMARKABLE CO CONVERSION TOWARDS FISHER-TROPSCH SYNTHESIS (FTS) IN COMPARISON WITH CO/Γ-AL2O3. THIS INDICATED THE SPECIAL Core-shell structure FORMATION. CO@RU/G-AL2O3 CATALYST EXHIBITED EXCELLENT ABILITIES IN THE CASES OF INCREASING FORMATION OF LONG-CHAIN HYDROCARBONS AND SUPPRESSING SELECTIVITY TO LIGHTER HYDROCARBONS.

IN RECENT YEARS, Core/shell structureD COMPOSITE MATERIALS HAVE DROWNED SIGNIFICANT ATTENTION BECAUSE OF THEIR POTENTIAL FOR COMBINING PROPERTIES THAT ARE DIFFICULT TO ATTAIN SEPARATELY WITH THE INDIVIDUAL COMPONENTS. Core/shell MATERIALS COMPRISING OF A FERROMAGNETIC COMPONENT AND A CONDUCTING POLYMER HAVE RECENTLY BEEN INVESTIGATED IN SEVERAL STUDIES [1]. AMONG THE VARIOUS CONDUCTING POLYMERS, POLYANILINE HAS EMERGED AS THE MOST PROMISING CONDUCTING POLYMER DUE TO ITS UNIQUE PROPERTIES [2]. ON THE OTHER HAND, MAGNETIC NANOPARTICLES OF SPINEL FERRITES WERE FOCUSED BY MANY RESEARCHERS BECAUSE OF THEIR INTERESTING ELECTRICAL AND MAGNETIC PROPERTIES. CONSIDERING THESE PROPERTIES, SYNTHESIS OF VARIOUS Core/shell structureD BASED ON FERRITES WHICH SHOWED HARD MAGNETIZATION ARE ONE OF THE INTERESTING RESEARCH SUBJECTS.IN THIS WORK, COBALT FERRITE (COFE2O4) NANOPARTICLES WERE PREPARED BY COMBUSTION METHOD USING GLYCINE AS A FUEL [3]. IN ORDER TOCOAT COBALT FERRITE WITH POLYANILINE AND THE SYNTHESIS OF COFE2O4@PANI WITH CHROMATE COUNTER ION, IN-SITU OXIDATIVE POLYMERIZATION OF ANILINE WITH CRO3, AS AN OXIDANT, WAS CARRIED OUT IN THE PRESENCE OF COFE2O4. THIS IS THE FIRST EXAMPLE OF PANI COATING WHICH CONTAINS CHROMATE COUNTER ION.THE AS-FABRICATED COFE2O4@PANI-CHROMATE NANOCOMPOSITE, WHICH CONTAINS CENTRAL MAGNETIC Core WITH A STRONG RESPONSE TO EXTERNAL FIELD, WAS CHARACTERIZED BY FT-IR, XRD AND SEM TECHNIQUES. MAGNETIC CHARACTERIZATION OF THE COMPOSITE WAS CARRIED OUT USING A VIBRATING SAMPLE MAGNETOMETER. BY APPLYING THIS TECHNIQUE, MAGNETIC PARAMETERS, SUCH AS SATURATION MAGNETIZATION (MS), COERCIVITY (HC) AND REMNANT MAGNETIZATION (MR) CAN BE DEDUCED. THE MS AND MR VALUES OF THE NANOCOMPOSITE ARE LESS THAN THOSE OBTAINED FOR NAKED COFE2O4 WHILE THE HC VALUE IS HIGHER THAN THAT OF UNCOATED COFE2O4. THE INCREASED COERCIVITY (HC) VALUE OF THE NANOCOMPOSITE IS DUE TO THE SURFACE ANISOTROPY UPON COATING [4]. THE HIGH VALUE OF COERCIVITY (HC=1484.8OE) REVEALS THAT THE SYNTHESIZED COMPOSITE CAN BE CONSIDERED AS A HARD MAGNETIC MATERIAL. THIS COMPOSITE WHICH CONTAINS CHROMATE COUNTER ION WAS ALSO STUDIED FOR ITS CATALYTIC ACTIVITY FOR SOME ORGANIC AND INORGANIC REACTIONS.