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A Novel Despeckling Method for Medical Ultrasound Images Based on the Nonsubsampled Shearlet and Guided Filter
摘要： Porous maghemite (PM) was prepared by two-step calcinations. The crystallographic and magnetic changes of PM upon SO4^2? and CO3^2? adsorption were investigated. The crystallite size (~ 27 nm) and PM texture remain unchanged after adsorption. Fourier transform infrared spectra showed that SO4^2? and CO3^2? are adsorbed on the PM mainly through outer- and inner-sphere surface complexations, respectively. X-ray photoelectron spectra showed the increase and decrease of binding energy for Fe 2p3/2 electrons after SO4^2? and CO3^2? adsorption, respectively. Sulfate adsorption increases the magnetic susceptibility (χ) of PM by ~ 4.5%, and decreases the saturation magnetization (Ms) of PM by 24.6%. By comparison, carbonate adsorption decreases χ by ~ 3.7% and increases Ms by 17.8%. The magnetic changes upon SO4^2? and CO3^2? adsorption are attributed both to the electronegativity of anions and the size distribution of PM.
关键词： Adsorption,Electronegativity,Inorganic anion,Porous maghemite,Magnetic property
更新于2025-09-11 14:15:04
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A novel Co(II) based multifunctional metal-organic framework: synthesis, fluorescence sensing and magnetic analysis
摘要： A new coordination Co(II) complex, namely, [Co2(DIPT)4(PClA)2Cl2]·H2O ( NCl-1 ) ( DIPT= 2-(2,4-dichlorophenyl) -1H-imidazo [4,5-f]-[1,10]phenanthroline, HPClA=3-(2-chlorophenyl)acrylie ) has been synthesized under solvothermal conditions and structurally characterized by elemental analysis, IR spectroscopy, single-crystal X-ray diffraction analysis, nitrogen adsorption analysis and powder X-ray diffraction. NCl-1 constructed by six coordinated mode with metal center and connected different ligands and ions, exhibits a three-dimensional structure under interactions of hydrogen bond and π-π stacking interactions. The luminescence explorations demonstrated that NCl-1 exhibits highly selective and sensitive sensing for organic solvents ( MeOH ) and metal ion ( Fe3+ ). Furthermore, magnetic analysis indicated that NCl-1 also own the property of anti ferromagnetic.
关键词： Crystal structure,Magnetic property,Fluorescent sensing,Hydrothermal synthesis
更新于2025-09-11 14:15:04
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Syntheses, structures, photoluminescence, and magnetism of a series of 3,5-di(3,4-dicarboxylphenyloxy)benzoate-based complexes tuned by N-donor co-ligands and transition metal ions
摘要： Six transition metal–organic complexes based on 3,5-di(3,4-dicarboxylphenyloxy)benzoic acid (H5L) and different N-donor co-ligands, namely, Cu(H3L)(2,20-bpy)(cid:2)H2O (1), Zn2(HL)(2,20-bpy)2 (2), Cd2(HL)(2,20-bpy)2(H2O) (3), Cd2(HL)(phen)4(cid:2)5H2O (4), Cu(H3L)(phen) (5), and Cu(H3L)(4,40-bpy)(cid:2)H2O (6) (2,20-bpy = 2,20-bipyridine, phen = 1,10-phenanthroline, 4,40-bpy = 4,40-bipyridine), were successfully synthesized under hydrothermal conditions. Their structures were determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR, powder X-ray diffraction (PXRD), and thermogravimetric analyses (TGA). Complexes 1 and 5 possess discrete zero-dimensional (0D) structures which are further assembled into three-dimensional (3D) supramolecular frameworks by hydrogen-bonding interactions and p–p stacking interactions. Complexes 2 and 3 display similar 3D frameworks with different topologies. Complex 4 shows a one-dimensional (1D) chain which is further connected into a two-dimensional (2D) supramolecular layer via p–p stacking interactions. Complex 6 exhibits a 1D chain which is further extended into a 3D supramolecular network through hydrogen-bonding interactions. The H5L ligand is partially deprotonated in 1–6. The N-donor co-ligands and transition metal ions have important effects on the architectures of 1–6. The photoluminescent properties of 2–4 and the magnetic properties of 1 and 6 were also studied.
关键词： 3,5-Di(3,4-dicarboxylphenyloxy)benzoic acid,Magnetic property,N-donor co-ligand,Photoluminescent property,Transition metal
更新于2025-09-04 15:30:14