Aim and Background: Generally, reducing the particle size in the nanoscale particles increases the surface to volume ratio and the impact of the behavior of the material surface atoms compared to the behavior of the mass of atoms. The most important effect of the surface increase is the extreme reactivity of nanomaterials due to high concentration of the surface atoms or molecules in comparison with the mass of the surface atoms or molecules which causes the nanoparticles agglomeration or cluster. To prevent the reactions, a stabilizer should be used to protect particles against abrasion and corrosion.Material and methods: This process is performed using Tetra-Ethyl-Ortho-Silicate. The obtained nanoparticles were characterized by Scanning electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD) and Vibrating Sample Magnetometer (VSM).Results: According to the analysis carried out, particles 40 nm were obtained and silica-coated magnetite nanoparticles were well synthesized. In addition, the nanoparticles MAGNETIC saturation decrease after coating significantly and reduce ability to absorb nanoparticles in MAGNETIC separation process well as.Conclusion: In this article, coating iron oxide MAGNETIC nanoparticles with very thin layer of the silica coating is investigated. According to this method, after stabilization of iron oxide MAGNETIC nanoparticles with silica, in addition to stabilizing the MAGNETIC nanoparticles, MAGNETIC properties of nanoparticles are not decreased.

The synthesis of nanostructures cobalt through a controlled chemical process followed by heat treating at various temperatures is studied. The product is characterized by ICP, XRD, FESEM, and TEM, indicating that the as- synthesized particles have an amorphous structure with 1.76 for Co/B ratio, an average size of 50 nm. The transformation of intermediate phases into single phase nanocrystalline metallic cobalt during the heat treatment is investigated by DSC analysis. The mean crystallite size of obtained cobalt was 30 nm. The decrease in coercivity (4344.93A/mf) with the sharp increase in saturation magnetization (1.41×10-4 Am2/kg) presents excellent ferroMAGNETIC properties for nano- crystallite cobalt.

The title complex, [Ce (DMSO)2 (H2O) Fe (CN)6] (1), was obtained by solution reactions and structurally characterized by X-ray diffraction. The title complex is characteristic of a novel cyano-bridged two-dimensional stair-like layered structure. The MAGNETIC PROPERTY of the title complex is reported herein.The cMT value at 300 K is ca. 0.92 emu K mol-1. The temperature dependence behavior of molar MAGNETIC susceptibility of the complex clearly indicates the presence of an antiferroMAGNETIC interaction.

Background: MAGNETIC resonance imaging (MRI) using nanostructures has been a proper method for tumor targeting purposes. Different MRI nanomaterials, targeting agents and anticancer drugs have been used for targeting of tumors. Objectives: This study aims to consider the MRI PROPERTY of doxorubicin (DOX)-loaded gadolinium/13X zeolite/folic acid (Gd3+/13X/FA) nanocomposite. Material and Methods: In this in vitro study, Gd3+/13X/FA/DOX nanocomposite was prepared and the X-ray diffraction, scanning electron microscopy and MTT assay were conducted to evaluate the physicochemical properties of the nanocomposite. MRI was performed at 25° C using a 1. 5 T clinical system to determine the T1 relaxation times and subsequently, the T1 relaxivity. Results: The size of the nanocomposite was in the range of 80-200 nm. The nanocomposite without DOX loading (Gd3+/13X/FA) showed compatibility for A549 cells for all concentrations while DOX-loaded nanocomposite was toxic for 62% of the cells at the concentration of 0. 4 mg/ml. The T1 relaxivity of Gd3+/13X/FA/DOX nanocomposite was 4. 0401 mM-1s-1. Conclusion: Gd3+/13X/FA/DOX nanocomposite shows a T1 relaxivity similar to the conventional gadolinium chelates, and a successful DOX loading.

Background and Aims: Disc displacement is the most common temporomandibular joint disorder and MAGNETIC resonance imaging (MRI) is the gold standard in its diagnosis. This disorder can lead to changes in signal intensity of MAGNETIC resonance (MR). The purpose of this study was evaluation of correlation between relative signal intensity of MR images of retrodiscal tissue, superior and inferior head of lateral ptrygoid muscle with type of anterior disk displacement and condylar head flattening in patients with temporomandibular disorder (TMD).Materials and Methods: In this retrospective study, 31 MR images of patients who had anterior disc displacement were evaluated. After relative signal intensity measurement for retrodiscal tissue, superior and inferior head of lateral ptrygoid muscle, the correlation between relative signal intensity and type of anterior disc displacement was evaluated with repeated measure ANOVA test. In each of these 3 areas, t-test was used to compare the groups with and without condylar head flattening.Results: The correlation between relative signal intensity of MR images and type of anterior disc displacement in retrodiscal tissue, superior and inferior head of lateral ptrygoid muscle was not significant. There was also no statistically significant correlation between relative signal intensity of MR images and flattening of condylar head in retrodiscal tissue, superior and inferior head of lateral ptrygoid muscle (P>0.05).Conclusion: According to findings of this study, relative signal intensity of MR images in retrodiscal tissue, superior and inferior head of ptrygoid muscle is not a good predictor for type of anterior disc displacement and flattening of condylar head. It seems that this cannot be used as a diagnostic marker for TMD progression.

In this paper, Bi0.85-xLa0.15YxFeO3 [BL0.15YxFO, (x=0, 0.03, 0.1, 0.15)] nanoparticels were synthesized by the tartaric acid modified sol-gel technique. This materials have perovskite structure. In perovskite lattice, such distortions change the B-O-B bond angles and there fore are expected to affect MAGNETIC and electronic properties of this lattice. The crystallographic phase analysis was performed for x = 0.1 and x = 0.15 with the help of FULLPROF program and showed the crystal structure transition from rhombohederal to the orthorhombic. The results of VSM analysis showed that remnant magnetization and maximum magnetization decreases with increasing the percent of doping.

IIn this research, MNPs were fabricated and coated by the co-precipitation method. The study of this process was performed in a two-level factorial design framework. The effect of a polymeric agent, the strength of the alkaline solution, and the temperature on the MAGNETIC properties MNPs were studied in this design. the structure, morphology, size, appearance, and MAGNETIC behavior of modified MNPs were investigated using XRD, FT-IR, TEM, and VSM. The results obtained from the spectra show the modified MNPs have superparaMAGNETIC behavior with high saturation magnetization ( ) and small coercivity ( ). The mean size of coated MNPs was determined 10 nm, saturation magnetization 60.98 emu/g, and MAGNETIC coercivity 8.26 G.