The Experts below are selected from a list of 3762 Experts worldwide ranked by ideXlab platform
Nasrin Lotfibakhshaiesh - One of the best experts on this subject based on the ideXlab platform.
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sol gel synthesis and characterization of unexpected Rod Like Crystal fibers based on sio2 1 x cao xsro p2o5 dried gel
Journal of Non-crystalline Solids, 2012Co-Authors: Safa Taherkhani, Fathollah Moztarzadeh, Masoud Mozafari, Nasrin LotfibakhshaieshAbstract:Abstract Sol–gel technique has several benefits for the preparation of glass, and morphology can be better controlled compared to conventional methods. In this research, new sol–gel derived bioactive glasses based on SiO2–CaO–SrO–P2O5 dried-gel were synthesized and characterized. Herein, a series of 58S bioactive glasses with the composition of 60%SiO2–36%(CaO/SrO)–4%P2O5 (mol%) were synthesized, and the effect of adding strontium (Sr) to the glass structure SiO2–(1-x)CaO–xSrO–P2O5 (where x = 0, 0.5, 0.1, 0.25, 0.5 and 1) was investigated by gradually substitution of Sr with calcium (Ca). The obtained results indicated that the Sr free sample totally takes amorphous state indicative of the internal disorder, glassy nature and non-Crystalline states of this material. Surprisingly, after further addition of Sr to the glass structure, the X-ray diffraction (XRD) patterns and scanning electron microscopy (SEM) micrographs showed unexpected significant Rod-Like Crystal fibers, and the major diffraction peaks of Sr(NO3)2, SrCO3 and Sr2Si2O4 became sharper and more apparent up to the final addition of Sr. The complicated and contradictory results underscore the need for better knowledge of how impurities act upon by growing Rod-Like Crystals. In addition, totally understanding the effect of Sr on the morphology of samples from the bottom up is a daunting challenge.
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Sol–gel synthesis and characterization of unexpected Rod-Like Crystal fibers based on SiO2–(1-x)CaO–xSrO–P2O5 dried-gel
Journal of Non-Crystalline Solids, 2012Co-Authors: Safa Taherkhani, Fathollah Moztarzadeh, Masoud Mozafari, Nasrin LotfibakhshaieshAbstract:Abstract Sol–gel technique has several benefits for the preparation of glass, and morphology can be better controlled compared to conventional methods. In this research, new sol–gel derived bioactive glasses based on SiO2–CaO–SrO–P2O5 dried-gel were synthesized and characterized. Herein, a series of 58S bioactive glasses with the composition of 60%SiO2–36%(CaO/SrO)–4%P2O5 (mol%) were synthesized, and the effect of adding strontium (Sr) to the glass structure SiO2–(1-x)CaO–xSrO–P2O5 (where x = 0, 0.5, 0.1, 0.25, 0.5 and 1) was investigated by gradually substitution of Sr with calcium (Ca). The obtained results indicated that the Sr free sample totally takes amorphous state indicative of the internal disorder, glassy nature and non-Crystalline states of this material. Surprisingly, after further addition of Sr to the glass structure, the X-ray diffraction (XRD) patterns and scanning electron microscopy (SEM) micrographs showed unexpected significant Rod-Like Crystal fibers, and the major diffraction peaks of Sr(NO3)2, SrCO3 and Sr2Si2O4 became sharper and more apparent up to the final addition of Sr. The complicated and contradictory results underscore the need for better knowledge of how impurities act upon by growing Rod-Like Crystals. In addition, totally understanding the effect of Sr on the morphology of samples from the bottom up is a daunting challenge.
Safa Taherkhani - One of the best experts on this subject based on the ideXlab platform.
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sol gel synthesis and characterization of unexpected Rod Like Crystal fibers based on sio2 1 x cao xsro p2o5 dried gel
Journal of Non-crystalline Solids, 2012Co-Authors: Safa Taherkhani, Fathollah Moztarzadeh, Masoud Mozafari, Nasrin LotfibakhshaieshAbstract:Abstract Sol–gel technique has several benefits for the preparation of glass, and morphology can be better controlled compared to conventional methods. In this research, new sol–gel derived bioactive glasses based on SiO2–CaO–SrO–P2O5 dried-gel were synthesized and characterized. Herein, a series of 58S bioactive glasses with the composition of 60%SiO2–36%(CaO/SrO)–4%P2O5 (mol%) were synthesized, and the effect of adding strontium (Sr) to the glass structure SiO2–(1-x)CaO–xSrO–P2O5 (where x = 0, 0.5, 0.1, 0.25, 0.5 and 1) was investigated by gradually substitution of Sr with calcium (Ca). The obtained results indicated that the Sr free sample totally takes amorphous state indicative of the internal disorder, glassy nature and non-Crystalline states of this material. Surprisingly, after further addition of Sr to the glass structure, the X-ray diffraction (XRD) patterns and scanning electron microscopy (SEM) micrographs showed unexpected significant Rod-Like Crystal fibers, and the major diffraction peaks of Sr(NO3)2, SrCO3 and Sr2Si2O4 became sharper and more apparent up to the final addition of Sr. The complicated and contradictory results underscore the need for better knowledge of how impurities act upon by growing Rod-Like Crystals. In addition, totally understanding the effect of Sr on the morphology of samples from the bottom up is a daunting challenge.
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Sol–gel synthesis and characterization of unexpected Rod-Like Crystal fibers based on SiO2–(1-x)CaO–xSrO–P2O5 dried-gel
Journal of Non-Crystalline Solids, 2012Co-Authors: Safa Taherkhani, Fathollah Moztarzadeh, Masoud Mozafari, Nasrin LotfibakhshaieshAbstract:Abstract Sol–gel technique has several benefits for the preparation of glass, and morphology can be better controlled compared to conventional methods. In this research, new sol–gel derived bioactive glasses based on SiO2–CaO–SrO–P2O5 dried-gel were synthesized and characterized. Herein, a series of 58S bioactive glasses with the composition of 60%SiO2–36%(CaO/SrO)–4%P2O5 (mol%) were synthesized, and the effect of adding strontium (Sr) to the glass structure SiO2–(1-x)CaO–xSrO–P2O5 (where x = 0, 0.5, 0.1, 0.25, 0.5 and 1) was investigated by gradually substitution of Sr with calcium (Ca). The obtained results indicated that the Sr free sample totally takes amorphous state indicative of the internal disorder, glassy nature and non-Crystalline states of this material. Surprisingly, after further addition of Sr to the glass structure, the X-ray diffraction (XRD) patterns and scanning electron microscopy (SEM) micrographs showed unexpected significant Rod-Like Crystal fibers, and the major diffraction peaks of Sr(NO3)2, SrCO3 and Sr2Si2O4 became sharper and more apparent up to the final addition of Sr. The complicated and contradictory results underscore the need for better knowledge of how impurities act upon by growing Rod-Like Crystals. In addition, totally understanding the effect of Sr on the morphology of samples from the bottom up is a daunting challenge.
Yitai Qian - One of the best experts on this subject based on the ideXlab platform.
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Formation of semiconductor Cu2−xSe Rod-Like Crystals through a solvothermal reaction
Materials Research Bulletin, 2002Co-Authors: Yuanfang Liu, Jinghui Zeng, Jinbo Cao, Yuanyuan Wang, Yitai QianAbstract:Micron-sized Rod-Like Crystals of Cu{sub 2-x}Se were successfully grown for the first time by a hydrothermal reaction from CuCl{sub 2}{center_dot}2H{sub 2}O and Se powder at 60 deg. C for 2 h. X-ray powder diffraction patterns (XRD), X-ray photoelectron spectra (XPS), scanning electron microscopy (SEM) images, and transmission electron microscope (TEM) images show that the pRoduct is cubic Cu{sub 2-x}Se Rod-Like Crystal and well Crystallized. Hydrazine hydrate was used as solvent in the process and played an important role in the formation of Rod-Like Cu{sub 2-x}Se Crystals. The optical properties of Cu{sub 2-x}Se, such as absorption spectra, photoluminescence (PL) spectra, and Raman spectrum are also reported for the first time.
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Room temperature growth of Rod-Like nanoCrystalline Ag2Te in mixed solvent
Journal of Crystal Growth, 2001Co-Authors: Yang Jiang, Zhiping Yang, Yi Xie, Yitai QianAbstract:Abstract Rod-Like nanoCrystalline Ag 2 Te has been prepared via a room temperature reaction between AgCl and element Te in the mixed solvent of ethylenediamine and hydrazine hydrate. The pRoduct was characterized through XRD, TEM, and XPS. The results showed that the pRoduct was the monoclinic phase Ag 2 Te with high purity, and was well Crystallized as a uniform Rod-Like Crystal with a length of 120 nm and a diameter of 30 nm on average. The possible mechanism for the formation of the Ag 2 Te nanoCrystals in mixed solvent was discussed.
W Abd H Majid - One of the best experts on this subject based on the ideXlab platform.
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hot plate annealing at a low temperature of a thin ferroelectric p vdf trfe film with an improved Crystalline structure for sensors and actuators
Sensors, 2014Co-Authors: Rahman Ismael Mahdi, W Abd H MajidAbstract:Ferroelectric poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) copolymer 70/30 thin films are prepared by spin coating. The Crystalline structure of these films is investigated by varying the annealing temperature from the ferroelectric phase to the paraelectric phase. A hot plate was used to pRoduce a direct and an efficient annealing effect on the thin film. The dielectric, ferroelectric and pyroelectric properties of the P(VDF-TrFE) thin films are measured as a function of different annealing temperatures (80 to 140 °C). It was found that an annealing temperature of 100 °C (slightly above the Curie temperature, Tc) has induced a highly Crystalline β phase with a Rod-Like Crystal structure, as examined by X-ray. Such a Crystal structure yields a high remanent polarization, Pr = 94 mC/m2, and pyroelectric constant, p = 24 μC/m2K. A higher annealing temperature exhibits an elongated needle-Like Crystal domain, resulting in a decrease in the Crystalline structure and the functional electrical properties. This study revealed that highly Crystalline P(VDF-TrFE) thin films could be induced at 100 °C by annealing the thin film with a simple and cheap method.
Fathollah Moztarzadeh - One of the best experts on this subject based on the ideXlab platform.
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sol gel synthesis and characterization of unexpected Rod Like Crystal fibers based on sio2 1 x cao xsro p2o5 dried gel
Journal of Non-crystalline Solids, 2012Co-Authors: Safa Taherkhani, Fathollah Moztarzadeh, Masoud Mozafari, Nasrin LotfibakhshaieshAbstract:Abstract Sol–gel technique has several benefits for the preparation of glass, and morphology can be better controlled compared to conventional methods. In this research, new sol–gel derived bioactive glasses based on SiO2–CaO–SrO–P2O5 dried-gel were synthesized and characterized. Herein, a series of 58S bioactive glasses with the composition of 60%SiO2–36%(CaO/SrO)–4%P2O5 (mol%) were synthesized, and the effect of adding strontium (Sr) to the glass structure SiO2–(1-x)CaO–xSrO–P2O5 (where x = 0, 0.5, 0.1, 0.25, 0.5 and 1) was investigated by gradually substitution of Sr with calcium (Ca). The obtained results indicated that the Sr free sample totally takes amorphous state indicative of the internal disorder, glassy nature and non-Crystalline states of this material. Surprisingly, after further addition of Sr to the glass structure, the X-ray diffraction (XRD) patterns and scanning electron microscopy (SEM) micrographs showed unexpected significant Rod-Like Crystal fibers, and the major diffraction peaks of Sr(NO3)2, SrCO3 and Sr2Si2O4 became sharper and more apparent up to the final addition of Sr. The complicated and contradictory results underscore the need for better knowledge of how impurities act upon by growing Rod-Like Crystals. In addition, totally understanding the effect of Sr on the morphology of samples from the bottom up is a daunting challenge.
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Sol–gel synthesis and characterization of unexpected Rod-Like Crystal fibers based on SiO2–(1-x)CaO–xSrO–P2O5 dried-gel
Journal of Non-Crystalline Solids, 2012Co-Authors: Safa Taherkhani, Fathollah Moztarzadeh, Masoud Mozafari, Nasrin LotfibakhshaieshAbstract:Abstract Sol–gel technique has several benefits for the preparation of glass, and morphology can be better controlled compared to conventional methods. In this research, new sol–gel derived bioactive glasses based on SiO2–CaO–SrO–P2O5 dried-gel were synthesized and characterized. Herein, a series of 58S bioactive glasses with the composition of 60%SiO2–36%(CaO/SrO)–4%P2O5 (mol%) were synthesized, and the effect of adding strontium (Sr) to the glass structure SiO2–(1-x)CaO–xSrO–P2O5 (where x = 0, 0.5, 0.1, 0.25, 0.5 and 1) was investigated by gradually substitution of Sr with calcium (Ca). The obtained results indicated that the Sr free sample totally takes amorphous state indicative of the internal disorder, glassy nature and non-Crystalline states of this material. Surprisingly, after further addition of Sr to the glass structure, the X-ray diffraction (XRD) patterns and scanning electron microscopy (SEM) micrographs showed unexpected significant Rod-Like Crystal fibers, and the major diffraction peaks of Sr(NO3)2, SrCO3 and Sr2Si2O4 became sharper and more apparent up to the final addition of Sr. The complicated and contradictory results underscore the need for better knowledge of how impurities act upon by growing Rod-Like Crystals. In addition, totally understanding the effect of Sr on the morphology of samples from the bottom up is a daunting challenge.
