Journal of Nanoanalysis
Volume:6 Issue: 3, Sep 2019

This research has been done to study characteristic and biocompatible evaluation of a nano-biocompositeceramic with the bioglass (BG) as a first phase. In this regard, synthesis of S53P4 (53% SiO2, 4% P2O5,23% Na2O and 20% CaO) bioglass has been considered as the first phase and flourapatite (FA) consideredas the second phase. Afterwards, nanocomposite with the base of S53P4 bioglass has been synthesizedby sol-gel method. The synthesized nanoparticles and nanocomposite have been characterized with thehelp of different techniques, using field emission scanning electron microscope (FESEM), X-ray diffraction(XRD), Fourier transforms infrared spectroscopy (FT-IR), X-ray fluorescence (XRF) to evaluate crystalstructure, microstructure, and morphology. The results showed that the crystallite size and the crystallinityof S53P4 bioglass-fluorapatite nanocomposites were about 20-30 nm and 70-90%, respectively.The FT-IR analyses displayed that the purity in the structure of this nanocomposite. The result of MTT(3-(4,5-Dimethylthiazol-2-Yl)-2,5-Diphenyltetrazolium Bromide) assay indicated the nontoxicity and alsodecreasing of cell viability in 7 days compared with the first day.

For the therapeutic application and drug delivery of AgNPs in medicine, pharmacy and cosmeticproducts, it is essential to know the distribution and local or systemic toxicity associated with them.For this purpose, this study was carried out to assess the potential consequences of skin injection ofnanochelating based synthesized AgNPs on the mice models. Nanochelating technology used to designand synthesize the AgNPs. The histopathological findings in skin and tissue of micemodels have assessedvia histopathological analysis.All samples were visualized by an independent pathologist. The results ofeach sample have reported as follows, micrograph of the skin cells have shown the normal architectureand cells in all samples. Moreover, histopathological evaluation of samples have shown normal withoutany significant pathological changes compared to control groups in volume of derm and epiderm, andthe number of fibroblast, neutrophil, and macrophage.In summary, this study has observed no obviousdecline of immunological performance and morphological signs of skin damage in the mice caused bynanochelating based AgNPs exposure. These findings could provide a fundamental understanding of theintrinsic toxicity associated with nanochelating based AgNPs on biological models. Moreover, this studywould arisetypical attentions on the future applications of nanochelating based AgNPs on human, whichis valuable for short-term and low dose treatment in nanomedicines.

h6-benzne, h6-garphyne) was studied with MPW1PW91 quantum chemical computations. Quantumtheory of atoms in molecules (QTAIM) was applied to elucidate these complexes Cr-CO bonds. Theellipticity (e) and h values of the Cr-CO bonds were calculated. The amount of pp-dp back-donation ofCr-CO bonds were illustrated by calculation of the magnitude of the quadrupole polarization of carbonatoms. Delocalization index values of C-C bonds of the six-member rings was calculated. Percentagecomposition in terms of the specified groups of frontier orbitals was found in these complexes to theinvestigation of the feature in metal-ligand bonds. The nature of chemical bond between the p-ring andCr(CO)3 fragments was demonstrated through energy decomposition analysis (EDA).

The application of porous bio-nanocomposites polymer has greatly increased in the treatment of boneabnormalities and bone fracture. Therefore, predicting the mechanical properties of these bio-nanocompositesare very important prior to their fabrication. Investigation of mechanical properties like (elasticmodulus and hardness) is very costly and time-consuming in experimental tests. Therefore, researchershave focused on mathematical methods and new theories to predict the artificial synthetic bone for orthopedicapplication. In this paper, porous bio-nanocomposites synthetic bone including nanocrystallineHydroxyapatite (HA) nanoparticles and Titanium oxide (TiO2) containing (0 wt%, 5 wt%, 10 wt%, and 15wt% of TiO2) as reinforcements and the biocompatible polycaprolactone (PCL) polymer as the matrix hasbeen used for the fabrication of PCL-HA-TiO2. Then, the mechanical test was conducted on the samplesand the extracted value of the experimental test was compared with the analytical model using moleculardynamics (MD) method. Finally, these properties were compared with the Dewey micromechanicstheory, and the error rate between the experimental method and the Dewey theory was reported. It wasfound that as the porosity percentage increased in the sample three-phase in composites, the model hasa higher error in this theory. Then, due to the importance of hydroxyapatite in the fabrication of bonescaffolds, the obtained results of mechanical properties (Elastic modulus and Poisson’s ratio) have beenanalyzed statistically. The application of these equations in the rapid prediction of Elastic Modulus andPoisson’s ratio of the synthetic bone scaffolds made of hydroxyapatite is highly recommended.

Cross-linked sulfonated polyacrylamide (Cross-PAA-SO3H) attached to nano-Fe3O4 as an efficientheterogeneous solid acid catalyst has been used for the preparation of spiro[pyrazoloquinoline-oxindoles]and spiro[chromenopyrazolo-oxindoles] through a four-component reactions of phenylhydrazineor hydrazine hydrate, isatins, ketoesters and naphthylamine or 2-naphthol under reflux conditions inethanol. The remarkable advantages of this methodology are easy work-up, short reaction times, highto excellent product yields, operational simplicity, low catalyst loading and reusability of the catalyst.

Superior electronic properties of graphene make it a substitute candidate for beyond-CMOSnanoelectronics in electronic devices such as the field-effect transistors (FETs), tunnel barriers, andquantum dots. The armchair-edge graphene nanoribbons (AGNRs), which have semiconductor behavior,are used to design the digital circuits. This paper presents a new design of ternary half adder basedon graphene nanoribbon FETs (GNRFETs). Due to reducing chip the area and integrated circuit (IC)interconnects, ternary value logic is a good alternative to binary logic. Extensive simulations have beenperformed in Hspice with 15-nm GNRFET technology to investigate the power consumption and delay.Results show that the proposed design is very high-speed in comparison with carbon nanotube FETs(CNTFETs). The proposed ternary half adder based on GNRFET at 0.9V exhibiting a low power-delayproduct(PDP) of ~10-20 J, which is a high improvement in comparison with the ternary circuits basedon CNTFET, lately proposed in the literature. This proposed ternary half adder can be advantageous incomplex arithmetic circuits.

The effect of ball milling on kinetics of the thermite reaction of 3Fe2O3 + 8Al powder mixture to synthesizeFe3Al-Al2O3 nanocomposite was investigated using differential thermal analysis. A model-free methodwas applied to the non-isothermal differential calorimetry (DSC) data to evaluate the reaction kineticsaccording to the Starink method. The activation energy of the thermite reaction in the Fe2O3-Al systemin ball milled 3Fe2O3 + 8Al powder mixture was determined to be 97 kJ/mole, which is smaller thanthat for non-milled powder mixture indicating the change of reaction mechanisms. The change in thereaction mechanism could be resulted from the formation of short-circuit diffusion paths occurring inthe precursors during milling. The change in the reaction mechanism of such nanostructured 3Fe2O3 +8Al powder mixture could be reason of the formation of desired phases (Fe3Al and Al2O3), which suchstoichiometric phases cannot be achieved by conventional molten state thermite reaction.

In this study, the solution combustion method as a simple, fast, and cost-effective method was utilizedfor the fabrication of spinel nickel aluminate as a stable material to use in the esterification reaction.The effect of fuel amount (urea) as an important parameter of the solution combustion method on thestructure, properties, and performance of the sample was evaluated. The results of characterizationanalyses revealed the highest crystallinity with the desired diffusion of nickel cations in alumina latticewas obtained for the sample prepared at a fuel ratio of 1.5. Moreover, a large pore size without anyagglomerated particle was observed because of releasing a huge amount of gases and high reactiontemperature formed during the combustion reaction. The sulfate groups were impregnated on theNiAl2O4 surface to increase the sample activity in the esterification reaction. The chelating bidentatestructure can confirm suitable bonding of sulfate groups with the surface of NiAl2O4. Evaluating thenanocatalyst activity in the esterification reaction of oleic acid confirmed the high activity of SO42-/NiAl2O4 nanocatalyst (94.2%) at the optimum condition of 120℃, 6 molar ratio of methanol/oleic acid,3 wt.% of catalyst, and 3 h reaction time. In addition, stability assessment of nanocatalyst with andwithout post-treatment after each run exhibited that the porosity blocking and poisoning of the surfacefunctional group were the major reasons for reducing the activity of the nanocatalyst. This activity wasincreased more than two times when the nanocatalyst was treated by washing and calcination (fivecycles) after each use.