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Open Access Article
1 - Effect of Solvents on the Synthesis of SrAl2O4 Nanoparticles by Reverse Micelle Process
Azita Moheb Saeid Abedini Khorramie Shahram Moradi Dehagi -
Open Access Article
2 - Strontium: a Standard for Understanding Social Organization
Tahereh Azizipour Seyed Ali Asghar Mirfatah Mousa SabziArchaeologists always pay attention to human and animal remains to understand manners of living in prehistoric societies. Rate concentration of Strontium in human skeletons from prehistoric societies is one of sources to study these societies. Rate concentration of this MoreArchaeologists always pay attention to human and animal remains to understand manners of living in prehistoric societies. Rate concentration of Strontium in human skeletons from prehistoric societies is one of sources to study these societies. Rate concentration of this element in archeological skeletons gives us information about social conditions of prehistoric societies’ inhabitants. For many years, archaeological human skeletons had been studied for understanding social situation in human societies. Manuscript profile -
Open Access Article
3 - Photocatalytic degradation of Malachite Green by Sr3MxAl2O6+δ ﴾M=None, Sm3+, Eu3+, Ho3+ and Yb3+) nanomaterial as an excellent and recyclable photocatalyst
Alireza Hakimyfard shahin khademinia -
Open Access Article
4 - Simple solvothermal synthesis of a novel Er3+ and Nd3+ doped Sr2As2O7 nanomaterials and investigation of catalytic performance for synthesis of organic compounds
shahka Ekhtiyari leila kafi ahmadi shahin khademinia -
Open Access Article
5 - Facile Synthesis of Pd/Cu2O Octahedral with Enhanced Photocatalytic Activity and Its Application of Degradation of Direct Red 278
Shahla Ekhtiyari Leila Kafi-Ahmadi Shahin Khademinia -
Open Access Article
6 - Effects of strontium and copper substitution on the catalytic performance of LaCoO3 in the combustion of methane: an optimization study
Hamzeh Rezaei Shadegan Sarah Maghsoodi Bijan Ghanavati Amirhossein Shahbazi Kootenaei Alireza Azimi -
Open Access Article
7 - The Importance of Arsenic, Vanadium, Cobalt and Strontium in Poultry, A Review
ب. نویدشاد م. محمدرضایی -
Open Access Article
8 - Synthesis and modification of ZSM-22 zeolite surface by Fe, Zr and Sr metals and studying their catalytic properties in biodiesel production reaction
maryam haghighi Mehranoosh FereidooniIn this study, zeolite ZSM-22 was synthesized via hydrothermal method. The obtained precipitate and ammonium nitrate solution were mixed together under reflux condition and the hydrogen was loaded into its structure. Zeolite synthesis conditions such as pH, synthesis ti MoreIn this study, zeolite ZSM-22 was synthesized via hydrothermal method. The obtained precipitate and ammonium nitrate solution were mixed together under reflux condition and the hydrogen was loaded into its structure. Zeolite synthesis conditions such as pH, synthesis time, and Si/Al ratio were also optimized during synthesis. Subsequently, to enhance the catalytic efficiency of the zeolites, Fe, Zr, and Sr were loaded onto the H-ZSM-22 structure during synthesis. Also, the activity of the synthesized catalysts and their effect on the process of esterification of oleic acid was investigated. To increase the efficiency of the esterification process, parameters such as temperature, reaction time, catalyst weight, molar ratio of oil to alcohol, and pH were optimized using potassium hydroxide salt. The results show that the yield of oleic acid at optimum conditions such as 0.3 g catalyst, temperature 70 ℃, 1:10 mmol molar ratio of oil to alcohol, 48 h duration and absence of potassium hydroxide, and using of the 22-Zr-H-ZSM catalyst is 48% that is more than of the other synthesized catalysts. Manuscript profile -
Open Access Article
9 - Synthesis of three-component nanocomposite zero-valent iron-strontium hexaferrite-graphene for the removal of ceftriaxone antibiotic from aqueous solution and optimization of conditions using Box Behnken design
shadan amiri mahmoodreza sohrabi fereshteh motieeIn this study, for the first time, zero-valent iron - strontium hexaferrite-graphene nanocomposite was synthesized and it was investigated as an adsorbent for removing ceftriaxone drug from aqueous solution. Synthesized adsorbents were analyzed by scanning electron micr MoreIn this study, for the first time, zero-valent iron - strontium hexaferrite-graphene nanocomposite was synthesized and it was investigated as an adsorbent for removing ceftriaxone drug from aqueous solution. Synthesized adsorbents were analyzed by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). Response Surface Methodology (RSM) based on Box–Behnken Design (BBD) were used to achieve the optimal experimental conditions. Accordingly, the effects of parameters such as adsorbent dosage (0.05-0.15 g L-1), pH (5-9), and initial concentration of ceftriaxone (5-15 mg L-1) on removal efficiency were investigated. A mathematical model was surveyed to predict the performance of drug removal. The results indicated that the second-order polynomial model is an efficient model for the removal of the intended drug. Finally, the Box–Behnken Design predicted that the adsorbent dosage of 0.15 g L-1, pH =5, and the initial drug concentration of 10 mg L-1 with 99% efficiency was the best condition for the removal of ceftriaxone from the aqueous solution. Manuscript profile -
Open Access Article
10 - Application of strontium ferrite nanoparticles for electrochemical determination of hydrazine at nanomolar level
محمد علی شیخ محسنی قاسم مرندیDue to the importance of the amount of hydrazine in water samples from the environmental point of view as well as frequent usage of this matter, the concentrations of this substance were to be measured in different samples. In this study, a new and simple electrode was MoreDue to the importance of the amount of hydrazine in water samples from the environmental point of view as well as frequent usage of this matter, the concentrations of this substance were to be measured in different samples. In this study, a new and simple electrode was fabricated for measuring hydrazine. The electrode was a carbon paste electrode modified by strontium ferrite nanoparticles. The electrode showed good sensitivity and selectivity for the electroanalysis of hydrazine due to the presence of nanoparticles. Voltammetric and chronoamperometric techniques proposed a good catalytic oxidation of hydrazine at the electrode surface. The hydrazine sensor was showed two linear calibration range which covers 0.5 to 20 micromolar and 20 to 600 micromolar. The selectivity of the electrode for measuring the hydrazine was good. Also the repeatability, reproducibility, and lifetime of the electrodes were acceptable. Determination of hydrazine in aqueous samples such as tap water and well water were performed. The obtained recovery percentages showed that the ability of the electrode in determination of real samples is reliable Manuscript profile -
Open Access Article
11 - Synthesis and Characterization of SrFe12O19/SiO2/TiO2 Composite Powder with Core/Shell/Shell Nanostructure
fatemeh bavarsiha Mehdi Montazeri-Pour Masoud Rajabi samira Gholami Naeimeh MozaffariIn this research study, the coating of titania particles on the SrFe12O19/SiO2 composite was successfully accomplished by the sol-gel process. For this purpose, first, the strontium hexaferrite particles were prepared by co-precipitation route with Fe3+/Sr2+ molar ratio MoreIn this research study, the coating of titania particles on the SrFe12O19/SiO2 composite was successfully accomplished by the sol-gel process. For this purpose, first, the strontium hexaferrite particles were prepared by co-precipitation route with Fe3+/Sr2+ molar ratios of 11 and 12 and subsequent calcination treatment. The formation of single phase strontium hexaferrite particles, as hard magnetic cores of the composite, was attained in the molar ratio of Fe3+/Sr2+=12 after calcination at 950 °C. In the next step, the silica coating of hexaferrite particles was performed using the tetraethyl orthosilicate (TEOS) precursor via the Stöber method. In the end, the covering of titania particles on the SrFe12O19/SiO2 composite was carried out by utilizing titanium n-butoxide (TNBT) precursor. The as-prepared composites were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy dispersive X-ray (EDX) and vibrating sample magnetometry (VSM) analyses. The results confirmed the core/shell/shell structure of the synthesized SrFe12O19/SiO2/TiO2 composite. The analysis of the magnetic properties showed that saturation magnetization (Ms) of strontium hexaferrite powder was obtained as 58 emu/g. After the successive coating of SiO2 and TiO2 shells, this amount has reached to 56 emu/g and 37 emu/g, respectively. Manuscript profile -
Open Access Article
12 - Comparative Study of the Effects of Strontium and Magnesium Ions on Physical and Chemical Properties of Calcium Phosphate-Gelatin Biomimetic Scaffolds in Bone Tissue Engineering
Amirhossein Moghanian Majid Raz Fathollah MoztarzadehIn this study, biomimetic scaffolds were designed to study the formation of calcium phosphate deposits by using a double diffusion method into gelatin hydrogel in temperature and pH similar to body conditions. Moreover, the effect of magnesium (Mg) and strontium (Sr) io MoreIn this study, biomimetic scaffolds were designed to study the formation of calcium phosphate deposits by using a double diffusion method into gelatin hydrogel in temperature and pH similar to body conditions. Moreover, the effect of magnesium (Mg) and strontium (Sr) ions on properties was investigated. Five different types of specimens with different Sr and Mg ions percentage were synthesized and then porous scaffolds were prepared by freeze-drying method. The scaffolds microstructures were examined by scanning electron microscopy (SEM), which showed a smooth and needle-shaped surface of specimens. Fourier transform infrared spectroscopy (FTIR) results indicated the presence of phosphate and hydroxyl bonds in the structure of the scaffolds, due to the formation of calcium phosphate phases such as HA. The presence of metal ions in the structure caused the displacement of the peaks in X-ray diffraction (XRD) analysis and lattice parameters. Additionally, osteoblast cell culture results also demonstrated M10 and S10 specimens had proper biocompatibility. Additionally, alkaline phosphate (ALP) activity revealed the optimal amount of 10 mol. % Mg and Sr (M10 and S10), which led to the significantly (**p< 0.01, ***p <0.001) growth, proliferation, and differentiation of 292G osteoblasts cells in scaffolds. Moreover, the presence of calcium phosphate improved the biological properties of the specimens. Finally, the results of various analyses confirmed the high capability of the synthesized scaffold as a promising substitute for bone tissue. Manuscript profile -
Open Access Article
13 - Investigation of the Effect of Strontium Ion Content on Thermal, Bioactivity, Antibacterial Properties and Behavior of MC3T3-E1 Osteoblast Cells in Silicate-Based Bioactive Glass
Noushin Nankali Amirhossein Moghanian Morteza Saghafi YazdiBioactive glass (BG), is able to bind to body tissues, in this regard, it can be considered suitable material for applications such as bone tissue engineering. In this study, we first synthesized and studied the structural changes, biocompatibility, in vitro bioactivity MoreBioactive glass (BG), is able to bind to body tissues, in this regard, it can be considered suitable material for applications such as bone tissue engineering. In this study, we first synthesized and studied the structural changes, biocompatibility, in vitro bioactivity, biological behavior and antibacterial properties of silicate-based BG containing with strontium. To evaluate the bioactivity, the BG powder was placed in a simulated body fluid (SBF) solution for 1, 3, 7 and 14 days and then before and after the mentioned time periods, the changes and the process of forming a hydroxyapatite (HA) layer on their surface was studied by using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), release rates of various ions elements, pH changes and scanning electron microscopy (SEM). The results of X-ray diffraction tests and infrared spectroscopy studies confirmed the formation of crystalline HA layer on the BG surface. Moreover, the results of live/dead assay, nucleus microstructure and actin microfilaments of MC3T3-E1 osteoblast cells showed that 5% of strontium in silicate-based bioactive glass led to the growth, proliferation and activity of MC3T3-E1 osteoblast cells. The results of cytotoxicity test and evaluation of alkaline phosphate activity showed that substitution of strontium instead of calcium in silicate-based bioactive glass composition not only did not cause cytotoxicity but also caused significant proliferation and activity of MC3T3-E1 osteoblast cells. Meanwhile, improvements in the antibacterial properties of strontium-containing bioactive glass against MRSA bacteria were observed in comparison with strontium-free bioactive glass. Manuscript profile -
Open Access Article
14 - Characterization and investigation of biocompatibility of bioactive glass 60 mol%SiO2-36 mol%CaO-4 mol%P2O5-5 mol%SrO containing zinc
Amirhossein Moghanian Noushin Nankali Morteza SaghafiyazdiIn this research, bioactive glasses 60mol%SiO2-36mol%CaO-4mol%P2O5-5mol%SrO containing 0, 5, and 8 mol% zinc were synthesized by sol-gel method, and the effect of adding ZnO microstructure, in vitro bioactivity and biocompatibility was investigated. To investigate the i MoreIn this research, bioactive glasses 60mol%SiO2-36mol%CaO-4mol%P2O5-5mol%SrO containing 0, 5, and 8 mol% zinc were synthesized by sol-gel method, and the effect of adding ZnO microstructure, in vitro bioactivity and biocompatibility was investigated. To investigate the in vitro bioactivity, glass powders were placed in the simulated body solution (SBF) for 14 days, and before and after the mentioned periods, the changes and process of hydroxyapatite (HA) phase formation on BGs surfaces, using characterization methods. Fourier transform infrared (FTIR), checking the release rate of different ions by inductively coupled plasma spectroscopy (ICP_AES), pH changes, and microstructure studies using a scanning electron microscope (SEM) were investigated. In the infrared Fourier transform spectroscopic analysis of the surface of the synthesized bioactive glasses after immersion in SBF solution, phosphate and carbonate bands were detected, indicating the synthesized glasses' bioactivity. Also, the scanning electron microscope images showed that the microstructure of HA created was spherical. Finally, among all the bioactive glasses synthesized in this research, S5Z5 bioactive glass was introduced as a new multi-functional biological bio-material in bone tissue engineering due to its osteogenic, biocompatibility, and bioactivity in vitro properties. Manuscript profile -
Open Access Article
15 - Evaluation of wear properties and radiopacity of strontium oxide-coated polyether ether ketone implant for the treatment of anterior cruciate ligament rupture
Mahboobeh MahmoodiOne of the most common orthopedic clinic referrals is direct and indirect traumas to the knee that lead to anterior cruciate ligament rupture. The use of titanium implants is one of the ways to treat and reconstruct the cruciate ligament, which has limitations, includin MoreOne of the most common orthopedic clinic referrals is direct and indirect traumas to the knee that lead to anterior cruciate ligament rupture. The use of titanium implants is one of the ways to treat and reconstruct the cruciate ligament, which has limitations, including the release of toxic ions such as aluminum and vanadium from the titanium alloy. In the present study, the polyether ether ketone (PEEK) implant was fabricated using a CNC machine. Then the surface of the implant was coated with strontium oxide (SrO) by dip spin coating method in two temperature conditions, including ambient temperature and 70 ℃ to produce a radiopaque polymer. After coating, the wear and surface properties of the implant were evaluated. The surface morphology, microstructure, and distribution of elements on the implant surface were evaluated by scanning electron microscope (SEM), X-Ray Diffraction (XRD), X-ray energy diffraction spectroscopy(EDS), and MAP analysis, respectively. The radiographic images indicated the good radiopacity level of the SrO-coated PEEK implant. The amount of weight loss for the PEEK implant and the SrO-coated PEEK implant was 0.0006 g and 0.0004 g in 1500 cycles, respectively. Good wear resistance was observed in two cycles of 500 and 1500 for the pores and surface of the SrO-coated PEEK implant. The results of the cell culture and live/dead staining showed 98% growth and proliferation of cells on the SrO-coated PEEK implant. Therefore, the findings of this study demonstrated that the SrO-coated PEEK implant can be used as a suitable alternative for the Endobutton. Manuscript profile