The Experts below are selected from a list of 8460 Experts worldwide ranked by ideXlab platform
Zongping Shao - One of the best experts on this subject based on the ideXlab platform.
-
Ternary Phase Diagram facilitated rapid screening of double perovskites as electrocatalysts for the oxygen evolution reaction
Chemistry of Materials, 2019Co-Authors: Hainan Sun, Jie Dai, H J Lin, Tingshan Chan, Chiente Chen, L H Tjeng, Wei Zhou, Zongping ShaoAbstract:The development of cost-effective, non-noble metal electrocatalysts for the oxygen evolution reaction (OER) is of paramount importance for sustainable technologies. Efficient screening strategies for electrocatalysts can greatly increase the commercialization speed of these advanced technologies. Here, Ternary Phase Diagrams with large-scale tuning and designated-scale tuning strategies are applied for the first time to provide a new method for screening perovskite oxide-based electrocatalysts for OERs. Specifically, the family of double perovskites (SrFeCoNiMoO, 0 ≤ x, y ≤ 1.5) was utilized to understand the role of transition metals in perovskite oxides. Ternary Phase Diagrams can facilitate a rapid screening process, provide a straightforward relationship between Phase structures and catalytic activities, and help to confirm the effects of various combinations of transition metals on the OER activity. The Fe-Co system (SrFeCoMoO) improves the catalytic activities, as demonstrated by the reduced Tafel slope and enhanced stability, while the Fe-Ni system (SrFeNiMoO) improves the surface kinetic properties of the OER, as demonstrated by its reduced overpotential. Significantly, the Co, Ni, and Fe Ternary Phase systems can serve as the synergistic coactive sites (SrFeCoNiMoO) to catalyze the OER, resulting in an improved overall OER performance. This systematic study not only demonstrates a new strategy to allow the rapid screening of double perovskite OER catalysts based on large-scale tuning and designated-scale tuning strategies but, more importantly, also provides an insightful understanding of the use of multitransition metal-based double perovskites for catalysis of the OER.
Zhi Li - One of the best experts on this subject based on the ideXlab platform.
-
700 c isothermal section of the al ti si Ternary Phase Diagram
Journal of Phase Equilibria and Diffusion, 2014Co-Authors: Zhi Li, Conglai Liao, Manxiu Zhao, Yu Wu, Xinming Wang, Zhaohui LongAbstract:The 700 °C isothermal section of the Al-Ti-Si Ternary Phase Diagram has been determined experimentally by means of scanning electron microscopy coupled with energy dispersive x-ray spectroscopy and x-ray powder diffraction. Fourteen three-Phase regions have been determined experimentally in the isothermal section at 700 °C. The Ternary Phases τ1 (I41/amd, Zr3Al4Si5-type) and τ2 (Cmcm, ZrSi2-type) are confirmed in the system at 700 °C. The compositions of τ1 and τ2 are found as Al6.2-9.3Ti32.4-34.0Si57.5-60.9 and Al10.0-11.6Ti34.2-34.5Si53.9-55.6, respectively. The τ3 and Ti3Al5 Phases are not found in the section. The Ti-rich corner at 700 °C shows the presence of three three-Phase equilibriums, i.e., (TiAl + Ti3Al + Ti5Si3), (α-Ti + Ti3Si + Ti5Si3) and (α-Ti + Ti3Al + Ti5Si3). The maximum solubility of Al in Ti5Si3, Ti3Si and α-Ti is 6.0, 1.5 and 13.9 at.% at 700 °C, respectively. The maximum solubility of Si in L-Al, TiAl3, TiAl2, TiAl, Ti3Al and α-Ti is 24.1, 13.6, 1.5, 0.8, 2.3 and 2.3 at.%, respectively.
-
450 c isothermal section of the zn fe bi Ternary Phase Diagram
Journal of Alloys and Compounds, 2008Co-Authors: Xuping Su, Zhi Li, Yuehui HeAbstract:Abstract The 450 °C isothermal section of the Zn–Fe–Bi Ternary Phase Diagram has been determined experimentally using scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS) and X-ray powder diffraction (XRD). Five three-Phase regions exist in the 450 °C isothermal section. Experimental results indicate that Bi is almost insoluble in the four Fe–Zn intermetallic compounds and in α-Fe Phase, and the solid solubility of Fe in Bi-rich Phase is also limited at 450 °C.
-
The 480 °C and 405 °C isothermal sections of the Phase Diagram of Fe–Zn–Si Ternary system
Journal of Alloys and Compounds, 2005Co-Authors: Jianhua Wang, Zhi Li, Xuping Su, Manxiu ZhaoAbstract:Abstract The 480 °C and 405 °C isothermal sections of the Fe–Zn–Si Ternary Phase Diagram have been determined experimentally using scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS) and X-ray diffractometry. The research of the work has concentrated on the Zn-rich corner, which is relevant to general galvanizing. The present studies have confirmed the existence of equilibrium state between the liquid, the ζ Phase and the FeSi Phase at the 480 °C isothermal section. There exist some changes in the Phase relationships compared with the isothermal section at 450 °C. Experimental results indicate that Si solubility in all four Zn–Fe compounds is also limited at 480 °C and 405 °C.
Manxiu Zhao - One of the best experts on this subject based on the ideXlab platform.
-
700 c isothermal section of the al ti si Ternary Phase Diagram
Journal of Phase Equilibria and Diffusion, 2014Co-Authors: Zhi Li, Conglai Liao, Manxiu Zhao, Yu Wu, Xinming Wang, Zhaohui LongAbstract:The 700 °C isothermal section of the Al-Ti-Si Ternary Phase Diagram has been determined experimentally by means of scanning electron microscopy coupled with energy dispersive x-ray spectroscopy and x-ray powder diffraction. Fourteen three-Phase regions have been determined experimentally in the isothermal section at 700 °C. The Ternary Phases τ1 (I41/amd, Zr3Al4Si5-type) and τ2 (Cmcm, ZrSi2-type) are confirmed in the system at 700 °C. The compositions of τ1 and τ2 are found as Al6.2-9.3Ti32.4-34.0Si57.5-60.9 and Al10.0-11.6Ti34.2-34.5Si53.9-55.6, respectively. The τ3 and Ti3Al5 Phases are not found in the section. The Ti-rich corner at 700 °C shows the presence of three three-Phase equilibriums, i.e., (TiAl + Ti3Al + Ti5Si3), (α-Ti + Ti3Si + Ti5Si3) and (α-Ti + Ti3Al + Ti5Si3). The maximum solubility of Al in Ti5Si3, Ti3Si and α-Ti is 6.0, 1.5 and 13.9 at.% at 700 °C, respectively. The maximum solubility of Si in L-Al, TiAl3, TiAl2, TiAl, Ti3Al and α-Ti is 24.1, 13.6, 1.5, 0.8, 2.3 and 2.3 at.%, respectively.
-
The 480 °C and 405 °C isothermal sections of the Phase Diagram of Fe–Zn–Si Ternary system
Journal of Alloys and Compounds, 2005Co-Authors: Jianhua Wang, Zhi Li, Xuping Su, Manxiu ZhaoAbstract:Abstract The 480 °C and 405 °C isothermal sections of the Fe–Zn–Si Ternary Phase Diagram have been determined experimentally using scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS) and X-ray diffractometry. The research of the work has concentrated on the Zn-rich corner, which is relevant to general galvanizing. The present studies have confirmed the existence of equilibrium state between the liquid, the ζ Phase and the FeSi Phase at the 480 °C isothermal section. There exist some changes in the Phase relationships compared with the isothermal section at 450 °C. Experimental results indicate that Si solubility in all four Zn–Fe compounds is also limited at 480 °C and 405 °C.
Pornsak Sriamornsak - One of the best experts on this subject based on the ideXlab platform.
-
enhancement of solubility and oral bioavailability of manidipine by formation of Ternary solid dispersion with d α tocopherol polyethylene glycol 1000 succinate and copovidone
Drug Development and Industrial Pharmacy, 2017Co-Authors: Benchawan Chamsai, Sontaya Limmatvapirat, Srisagul Sungthongjeen, Pornsak SriamornsakAbstract:Context: Low bioavailability of oral manidipine (MDP) is due to its low water solubility.Objective: The objective of this study was to increase the solubility and bioavailability of MDP by fabricating Ternary solid dispersion (tSD) with d-α-tocopherol polyethyleneglycol-1000-succinate and copovidone.Methods: In this study, solid Ternary Phase Diagram was applied in order to check the homogeneity of tSD prepared by melting and solidifying with dry ice. The physicochemical properties of different formulations were determined by differential scanning calorimetry (DSC), powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR) and hot stage microscopy. Their solubility, dissolution, stability and bioavailability were also investigated.Results and discussion: The results demonstrated that tSD obtained from Ternary Phase Diagram divided into homogeneous and non-homogeneous regions. In the homogenous region, the transparent characteristics of tSD was observed and considered as a gla...
-
improved stability of solid dispersions of manidipine with polyethylene glycol 4000 copovidone blends application of Ternary Phase Diagram
Drug Development and Industrial Pharmacy, 2017Co-Authors: Benchawan Chamsai, Sontaya Limmatvapirat, Srisagul Sungthongjeen, Pornsak SriamornsakAbstract:AbstractContext: Manidipine (MDP) is generally used clinically as an antihypertensive agent; however, the bioavailability of orally administered MDP is limited due to their very low water solubility.Objective: The objectives of this research were, therefore, to increase the solubility of MDP by the formation of Ternary solid dispersions (tSD) with polyethylene glycol 4000 (PEG4000) and copovidone and to improve their stability.Methods: Solid Ternary Phase Diagram was constructed to find homogeneous solid dispersion region after melting and solidifying at low temperature with different quenching substances. The pulverized powder of solid dispersions was then determined, for their physicochemical properties, by differential scanning calorimetry, powder X-ray diffractometry, Fourier transform infrared (FTIR) spectroscopy and hot stage microscopy. The solubility and dissolution of MDP from the tSD were investigated. The physical stability of tSD was also determined under accelerated condition at 40 °C/75% rel...
-
Enhancement of solubility and oral bioavailability of manidipine by formation of Ternary solid dispersion with d-α-tocopherol polyethylene glycol 1000 succinate and copovidone
2017Co-Authors: Benchawan Chamsai, Sontaya Limmatvapirat, Srisagul Sungthongjeen, Pornsak SriamornsakAbstract:Context: Low bioavailability of oral manidipine (MDP) is due to its low water solubility. Objective: The objective of this study was to increase the solubility and bioavailability of MDP by fabricating Ternary solid dispersion (tSD) with d-α-tocopherol polyethyleneglycol-1000-succinate and copovidone. Methods: In this study, solid Ternary Phase Diagram was applied in order to check the homogeneity of tSD prepared by melting and solidifying with dry ice. The physicochemical properties of different formulations were determined by differential scanning calorimetry (DSC), powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR) and hot stage microscopy. Their solubility, dissolution, stability and bioavailability were also investigated. Results and discussion: The results demonstrated that tSD obtained from Ternary Phase Diagram divided into homogeneous and non-homogeneous regions. In the homogenous region, the transparent characteristics of tSD was observed and considered as a glass solution, which have a higher MDP solubility than that in non-homogenous region. The hot stage microscopy, DSC and PXRD confirmed that solid dispersion was formed in which MDP was molecularly dispersed in the carriers, especially in the homogenous region of Phase Diagram. FTIR analysis demonstrated strong hydrogen bonding between amine groups of MDP and carbonyl groups of copovidone, which supported a higher solubility and dissolution of tSD. The pharmacokinetic study in Wistar rats showed that the tSD had the greatest effect on oral bioavailability. Immediate hypotensive effect of tSD was also observed in vivo. Conclusions: The improvement of stability, dissolution and oral bioavailability of MDP could be achieved by using tSD technique.
F Goutenoire - One of the best experts on this subject based on the ideXlab platform.
-
investigation of the la2o3 nb2o5 wo3 Ternary Phase Diagram isolation and crystal structure determination of the original la3nbwo10 material
ChemInform, 2015Co-Authors: Maud Barre, Karim Adil, A Jouanneaux, Emmanuelle Suard, F GoutenoireAbstract:Based on investigations of the La2O3-WO3-Nb2O5 Ternary Phase Diagram, La3NbWO10 is newly discovered in samples prepared from stoichiometric amounts of La2O3, Nb2O5, and WO3 (alumina crucible, complex heating schedule with max.
-
investigation of the la2o3 nb2o5 wo3 Ternary Phase Diagram isolation and crystal structure determination of the original la3nbwo10 material
Journal of Solid State Chemistry, 2015Co-Authors: Maud Barre, Karim Adil, A Jouanneaux, Emmanuelle Suard, F GoutenoireAbstract:Abstract In the course of the exploration of the La2O3–WO3–Nb2O5 Ternary Phase Diagram, a new compound with the formula La3NbWO10 was discovered. Its structure was determined from a combination of powder X-ray and neutron diffraction data. It crystallizes in the tetragonal space group P42/nmc (no. 137) with the lattice parameters: a=10.0807(1) A; c=12.5540(1) A. The structure is built up from infinite ribbons of octahedra (W/Nb)O5 which are perpendicular to each other, lanthanum ions being distributed around these ribbons. The electrical properties of this compound were investigated on sintered pellets by means of complex impedance spectroscopy.
