ZnFe2O4/α-Fe2O3/ZnO ternary transition metal oxides nanocomposite powder was successfully synthesized by facile coprecipitation method directly from metalorganic precursors within 4 hours processing time considerably shorter than other reported methods. To study post-synthesis thermal treatment effects on physical properties calcination process was applied at 500 °C, 600 °C and 700 °C individually in furnace for one hour. The structure, phase formation, morphology and optical features of the samples were characterized by means of powder X-ray diffraction, scanning electron microscopy and UV-Visible spectroscopy. The results show formation of pure and homogeneous composites comprised of nanoparticles with good crystallization in narrow range of crystallite size between 25 nm-39 nm. The particle sizes were also estimated to be in the range of 48 nm -93 nm. The optical property was studied by recording the absorbance spectrum in the range of 200 nm -700 nm. The absorption pattern illustrated that the product can be driven by both UV and visible wavelengths with a good efficiency which is more desirable for intended applications like photocatalytic activities compare to the individual components. By using Tauc's method the allowed direct band gap energy and indirect band gap energy of the prepared nanocomposite was estimated to be around 2.28 eV and 2.75 eV, respectively.
ZnFe 2 O 4 /α-Fe 2 O 3 /ZnO ternary transition metal oxides nanocomposite powder was successfully synthesized by facile coprecipitation method directly from metalorganic precursors within 4 hours processing time considerably shorter than other reported methods. To study post-synthesis thermal treatment effects on physical properties calcination process was applied at 500 °C, 600 °C and 700 °C individually in furnace for one hour. The structure, phase formation, morphology and optical features of the samples were characterized by means of powder X-ray diffraction, scanning electron microscopy and UV-Visible spectroscopy. The results show formation of pure and homogeneous composites comprised of nanoparticles with good crystallization in narrow range of crystallite size between 25 nm-39 nm. The particle sizes were also estimated to be in the range of 48 nm - 93 nm. The optical property was studied by recording the absorbance spectrum in the range of 200 nm - 700 nm. The absorption pattern illustrated that the product can be driven by both UV and visible wavelengths with a good efficiency which is more desirable for intended applications like photocatalytic activities compare to the individual components. By using Tauc's method the allowed direct band gap energy and indirect band gap energy of the prepared nanocomposite was estimated to be around 2.28 eV and 2.75 eV, respectively.
We employ electroless etching to disperse silicon on insulator (SOI) wafers in ionic silver HF into wirelike silicon nanostructures. The procedure allows detachment of the nanowires at the oxide interface and enables easy recovery of dispersions for subsequent controlled delivery. Nanowires 10 μm long and 50–100 nm thick are demonstrated using an SOI substrate of 10 μm device thickness. Direct material analysis shows no silver contamination after a wet-etch silver clean. Anodization treatment of the wires was conducted. Our measurements and analysis show that the wires are not amenable to anodization resulting from the fact that the nanowire radius is less than the thickness of depletion layer. The procedure has the potential of providing dispersions of arbitrarily long wirelike nanostructures which are useful for composite and energy applications.
ovid-19 is one of the diseases that has become very common in Iran since 2019, which is associated with symptoms such as fever above 38 degrees Celsius, fatigue and shortness of breath. In addition to having physical characteristics, the patient also suffers from psychological C Introduction: Women with multiple sclerosis have always faced many challenges, and their mental and sexual health are important concerns for health systems. So the present study aims to determine the effect of treatment based on acceptance and commitment on the mental health and sexual desire of women with MS during Covid-19 pandemic. Materials and Methods:The method of the current research was semi-experimental with a pretest-post-test design with a control group. The statistical population of the research was made up of women suffering from MS in Hamadan city in 2019. The sampling method was the available method, based on which 40 people were randomly placed in two groups of 20 people, experimental and control. Then the treatment based on acceptance and commitment was implemented on the experimental group during eight 90-minute sessions, but the control group did not receive the intervention. The research tools included two questionnaires of sexuality by Halbert and Apt (1992) and mental health by Goldberg (1979). In order to analyze the data, univariate and multivariate covariance analysis was used. Results:The analysis of the results showed that the treatment based on acceptance and commitment causes a significant increase in the average sexual desire of women with MS. Also, the average physical dysfunction, anxiety and social dysfunction also decreased significantly. But it had no effect on the depression of women with MS. Conclusion:Acceptance and commitment therapy can play an important role in improving the level of mental health, sexual desire and, as a result, the quality of life of women with MS in the difficult conditions of the Covid-19 pandemic.
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