Journal of Applied Research in Chemistry
Year:2015 | Volume:8 | Issue:4|Papers Count:9

In this study, in order to improve the sustainability and thermal stability of the insulin, magnetic polyurethane elastomers were used as the carrier. Magnetic iron oxide nanoparticles were used to synthesis waterborne magnetic polyurethane nanocomposite and to avoid aggregation of nanoparticles in the human body as well as to increase the half-life durability, the nanoparticles were modified by using dipodal silane (ECA) which is the reaction product of 3-aminopropyltriethoxysilane (APTS) and 3-glycidyloxy-propyltrimethoxysilane (GPTS). The resultant nanoparticles were used in combination with waterborne polyurethane elastomers in order to increase the biocompatibility and biodegrability synthesized magnetic nanocomposites. Successful synthesis of these compounds was confirmed by Fourier Transform Infrared Spectroscopy (FTIR), Nuclear Magnetic Resonance (NMR), Thermo Gravimetric Analysis (TGA), and Scanning and Transmission Electron Microscopy (SEM/TEM).

Generally, curing system and type of fillers are two factors that influence on the abrasion resistance of tread tires. In this study, mixture of carbon black and nanoclay for reinforcement of compounds were used, also electron beam irradiation and sulfur have used as curing systems. According to the lower necessity of nanoclay for reinforcement of compounds and also use of electron beam irradiation for cross linking in rubbers, rubber compounds based on natural rubber (NR) and styrene butadiene rubber (SBR) with weight ratio of 70/30 and 25 phr carbon black containing 4 and 7%wt of modified nanoclay were prepared by melt mixing method and conventional sulfur curing system. Also, for investigation the effect of irradiation dose on the properties of samples, electron beam irradiation with three doses, 100, 150 and 200 KGy were used. As comparison, rubber blend samples that containing 35 and 50 phr carbon black without nanoclay were prepared as basis samples. The effect of nanoclay content and irradiation dose on the abrasion loss of samples was investigated by applying abrasion test. Also, other properties such as hardness and percentage of resilience were characterised. The results showed addition of 4 and 7 %wt nanoclay, abrasion loss reduced but sample containing 4%wt nanoclay has better properties than sample containing 7%wt nanocaly. Also, increase in irradiation dose, abrasion resistance and hardness increased while resilience percent decreased that is probably due to decrease in polysulfide and disulfide bonds and increase in monosulfide and carbon-carbon bonds as well as cross linking density. These results confirmed with ATR-IR and swelling tests.

In this study, the graphene oxide was synthesized according to Staudenmeier method and then characterized using FT-IR, XRD, and SEM analyses. The halloysite nanotubes/ grapheneoxide (HNTs/GO) nanocomposites were synthesized and characterized. The prepared composites as nano-adsorbents were applied for the Pb2+ removal from aqueous solution. The results indicated that the adsorption quantity of Pb2+ onto HNTs/GO composite was dependent on pH, contact time, temperature pH, mixing speed, concentration of Pb2+ and amount of adsorbent. The nano-adsorbent demonstrates extremely fast lead removal from aqueous solution with high removal efficiency for HNTs/GO (92.8%±0.35) within 60 min. The HNTs/GO nanocomposite was stable and easily recovered. The developed nanocomposite could be good candidates for efficient Pb2+ removal from waste-water.

one-pot three-component condensation reaction of aromatic aldehydes, acetophenones, and NH4OAc has been achieved in the presence of catalytic amount of silica phospho sulfonic acid as a novel environmentally safe heterogeneous solid acid under solvent-free conditions. The present protocol offers several advantages including simple work-up procedure, high yields, and ease of catalyst isolation with suitable recyclability.

The clarity of non alcoholic beverages is commonly considered as an attractive characteristic for consumers. To achieve these characteristics, membrane separation technology has been used widely in food processing industries. The potential of cross-flow microfiltration as a proper separation technique for brewing is a subject of intensive study. Clarification of rough nonalcoholic beer (RB) and pasteurization of clarified beer (CB) by cross flow microfiltration (CFMF) stand as potential applications of membrane in the food industry. In this study, the effect of important parameters on filtration such as temperature, pressure, type, and pore size of membrane, and cross flow microfiltration for the clarification of beer were investigated. For the tested membranes the proper flux with less fouling were observed. The microfiltration of process with these membranes resulted in a clean beer with almost free of turbidity. The experimental results were confirmed by using scanning electrom microscopy (SEM).

Oxovanadium (IV) symmetrical complexes have been papered from the reaction of VO (acac)2 with tetradentate schiff bases. The compounds were characterized by elemental analyses, 1H-NMR, 13C-NMR, infrared, and thermal analysis (DSC). The thermal characteristic data of the complexes were determined from differential scanning calorimetry (DSC). The DSC data indicated that these complexes had very large decomposition enthalpy and released a lot of energy. Thus, thermal decomposition kinetics of these compounds was studied using DSC technique. The results showed that g-Fe2O3 nanoparticles catalyzed decomposition rate of synthesized complexes.

In this paper, clay/chitosan/multi wall carbon nanotube nanocomposite was prepared by a simple method via solution mixing and influence in the interlayers of clay. The synthesized nanocomposite was then used in a batch process for removal of Lead from water. The results showed that the remaining concentration of metal ions decreased significantly by using the nanocomposite at room temperature and pH=7 for 180 minutes. Also in comparison with pure nanoclay, the synthesized nanocomposite showed enhanced effects (percent of adsorption and adsorption capacity) in the removal of Lead. This nanocomposite was also characterized by scanning electron microscopy (SEM) to evaluate the morphology.

In this study, the metal-organic framework MOF-199 has been synthesized as hydrogen adsorbent. This nano-structure has been modified by the reduced Pd nanoparticles on the single wall nanotubes for enhancing hydrogen storage capacity at ambient temprature. The modified compound was characterizd by BET, SEM, XRD, and TGA techniques. The amount of hydrogen storage capacity was measured by volumetric methods at 298 K and 15 bar hydrogen pressure. The result showed that about 90% increase in hydrogen storage capacity of the MOF-199 compound after modification by Pd/SWCNTs.