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Open Access Article
1 - Investigation of the Structural and Electrical Properties of Star Shape Manganese Thin Films with 3-fold and 4-fold Symmetries
Fatemeh AbdiManganese star shape sculptured thin films with 3-fold and 4-fold symmetries were formed on glass substrates using glancing angle deposition method. The cross section of the structures was observed by field emission scanning electron microscopy. Atomic force microscopy MoreManganese star shape sculptured thin films with 3-fold and 4-fold symmetries were formed on glass substrates using glancing angle deposition method. The cross section of the structures was observed by field emission scanning electron microscopy. Atomic force microscopy and X-ray diffraction patterns were used to investigate the surface morphology and crystalline degree of the samples. The grain size and surface roughness of the samples were obtained using Nova software. The results showed that the porosity percentage of the star shape thin films depended on the grain size andshape of the structures. The electrical resistance of the star shape sculptured thin films was obtained using a four-point probe technique. Finally, electrical resistance dependence on the porosity percentage was investigated. Manuscript profile -
Open Access Article
2 - Fe3O4@SiO2/Kit-6 as a Magnetic Nano-Catalyst for the Synthesis of New Coumarin Fused Pyrrole Derivatives
Elham Sadr Hossein Anaraki-Ardakani Soheil Sayyahi Farzaneh HosseiniA series of new coumarin fused pyrrole derivatives were successfully synthesized through a one-pot multi-component reaction between 4-aminocoumarin, aryl glyoxals, and amides (thioacetamide) in the presence of Fe3O4@SiO2/Kit-6 in ethanol under reflux conditions. Further MoreA series of new coumarin fused pyrrole derivatives were successfully synthesized through a one-pot multi-component reaction between 4-aminocoumarin, aryl glyoxals, and amides (thioacetamide) in the presence of Fe3O4@SiO2/Kit-6 in ethanol under reflux conditions. Further advantages to this synthesis include excellent yields, mild reaction conditions, atom economy, environment-friendly, magnetically reusable catalyst, and no need for chromatographic separations. Manuscript profile -
Open Access Article
3 - The Effect of Carbon Nanotube on Improving Catalytic G-quadruplex Sensing Properties
Fahimeh Otovat Mohammad Reza Bozorgmehr Ali Mahmoudi Ali MorsaliIn the use of G-quadruplex as DNAzyme, the background signal corresponding to Hemin is high.Therefore, it limits the application of DNAzyme. If carbon nanotubes are added to the system containing G-quadruplex and Hemin, this problem will be solved. However, the mechanis MoreIn the use of G-quadruplex as DNAzyme, the background signal corresponding to Hemin is high.Therefore, it limits the application of DNAzyme. If carbon nanotubes are added to the system containing G-quadruplex and Hemin, this problem will be solved. However, the mechanism of the nanotube effect on DNAzyme is not known. In this work, molecular dynamics simulation was used to clarify this mechanism. The interaction between G-quadruplex and Hemin was simulated in the presence and absence of carbon nanotubes. The calculated distance between the center of mass ofG-quadruplex and Hemin during the simulation time shows that the nanotube increases the affinity of hemin to G-quadruplex. Also, the calculation of the conformational factor of the G-quadruplex residues shows that Hemin is bonded to the G-quadruplex from the top and side. The obtained results are in good agreement with the available experimental evidence. Manuscript profile -
Open Access Article
4 - Investigation of the Drug Delivery Potential of a Transdermal Patch Based on Buprenorphine Templated Molecular Imprinted Polymer
Nasrin Behnia Parviz Aberoomand Azar Maryam Shekarchi Mohammad Saber Tehrani Noushin AdibTo synthesize the molecular imprinted polymer (MIP), the well-known precipitation polymerization method was used. To do this, Methacrylic acid (MAA; as the functional monomer), ethylene glycol dimethacrylate (EGDMA; as the cross-linker), and 2,2-azobisissobutyronitrile MoreTo synthesize the molecular imprinted polymer (MIP), the well-known precipitation polymerization method was used. To do this, Methacrylic acid (MAA; as the functional monomer), ethylene glycol dimethacrylate (EGDMA; as the cross-linker), and 2,2-azobisissobutyronitrile (AIBN; as the initiator), were used. In addition, to control the release rate of Buprenorphine (BUP) from the patch, the bacterial cellulose (BC) was applied. The release process of the drug was investigated by high performance liquid chromatography(HPLC) system, which was showed to be fitted with the Higuchi expression. Moreover, the results have indicated that the obtained MIP-BC is a suitable candidate for the control released transdermal drug delivery. The work revealed that using MIP is more suitable compared to non-imprinted polymer (NIP). In addition, those results indicated that the MIP could be used as a patch for drug delivery application at least in the case of BUP drug. Manuscript profile -
Open Access Article
5 - Synthesis, characterization and Microwave Absorption Properties of Novel Hard-soft Ferrite and Polyaniline-loaded Nanocomposite
Tolou Pourashraf Mohammad Yousefi Saeid Shokri َAbbas Ahmadi Parviz Aberoomand AzarNanocomposites of hard-soft ferrites (SrFe12O19) (1-x)/(Ni0.4Mn0.2Zn0.4Fe2O4) x with x = 0.2, 0.4, 0.6,and 0.8 are synthesized by the auto-combustion sol-gel method. In-situ polymerization is used to create polyaniline and hard-soft ferrite nanocomposites. X-ray powder MoreNanocomposites of hard-soft ferrites (SrFe12O19) (1-x)/(Ni0.4Mn0.2Zn0.4Fe2O4) x with x = 0.2, 0.4, 0.6,and 0.8 are synthesized by the auto-combustion sol-gel method. In-situ polymerization is used to create polyaniline and hard-soft ferrite nanocomposites. X-ray powder diffractometers (XRD), field emission scanning electron microscopes (FESEM), Fourier transform infrared spectra (FTIR),vibrating sample magnetometers (VSM), and vector network analyzers (VNA) have all been used to evaluate the structure, morphology, magnetic properties, and microwave absorption ofnanocomposites. FT-IR spectra are used to confirm and validate the existence of both tetrahedral and octahedral complexes, as well as the interactions between polymer chains and hard and soft nanoparticles, which show that ferrite nanocomposites are coated with polymers. In hard-soft and polymeric nanocomposites, XRD analysis reveals the presence of pure hard and soft phase characteristics as well as PANI characteristics. SEM images show that the particles agglomerate in hard-soft composites as the soft phase rises as a result of being magnetic, and images for polymericcomposites show cohesive PANI particles that surround the hard-soft ferrite particle's surface.These findings demonstrate that PANI and hard-soft ferrites can be properly connected. VSM analysis revealed that by adding polymers, the magnetic properties of hard-soft composites dropped significantly due to the nonmagnetic effects of PANI. The VNA test shows that PANI/(SrFe12O19)0.4/(Ni0.4Mn0.2Zn0.4Fe2O4)0.6 exhibits optimized reflection loss from -1.84 to -16.53 in the X-Band (8-12.5 GHz frequency range) when compared to (SrFe12O19)0.4/ (Ni0.4Mn0.2Zn0.4Fe2O4) 0.6 with a matching thickness of 3 mm. Manuscript profile -
Open Access Article
6 - Designed a Resonance Rayleigh Scattering (RRS) Spectroscopic Technique for the Selective Determination of Acetaminophen Drug in Human Fluid Samples by Using Chitosan-capped Gold Nanoparticles
Kobra Moteabbed Jafar Burromandpiroze Vahid Zare- Shahabadi Soheil SayyahiThe interaction of acetaminophen drug by chitosan-capped gold Nanoparticles was investigated using a resonance Rayleigh scattering (RRS) spectroscopic technique. The standard deviation of (1.1 %), and detection limit of the method (0.5 ng mL-1 in time 6 min, 325 nm) wer MoreThe interaction of acetaminophen drug by chitosan-capped gold Nanoparticles was investigated using a resonance Rayleigh scattering (RRS) spectroscopic technique. The standard deviation of (1.1 %), and detection limit of the method (0.5 ng mL-1 in time 6 min, 325 nm) were obtained for sensor level response chitosan-capped AuNPs with (97%) confidence evaluated. The results indicated that this method had good selectivity in the presence of coexisting compounds. The scattering intensity (ΔIRRS) was linearly dependent on acetaminophen drug concentration over the range (0.5 to 200.0 ng mL-1) with a determination coefficient (r) of 0.998. This method could be suitably used for analysis of acetaminophen drug in pharmaceutical, human fluid, and other drugs, and hospital samples. Manuscript profile
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