Search

Your search keyword '"JI Liudi"' showing total 33 results
Start Over Author "JI Liudi"
33 results on '"JI Liudi"'

7. Chiral Star-Shaped [Co III 3 Ln III ] Clusters with Enantiopure Schiff Bases: Synthesis, Structure, and Magnetism.

Author

Ji, Liudi, Wang, Juntao, Li, Zeyu, Zhu, Xiaoming, and Hu, Peng

Subjects
*SINGLE molecule magnets, *MAGNETIC structure, *MAGNETIC measurements, *SCHIFF base derivatives, *MAGNETIC crystals
Abstract

Two enantiomeric pairs of new 3d–4f heterometallic clusters have been synthesized from two enantiomer Schiff base derivatives: (R/S)-2-[(2-hydroxy-1-phenylethylimino)methyl] phenol (R-/S-H2L). The formulae of the series clusters are Co3Ln(R-L)6 (Ln = Dy (1R), Gd (2R)), Co3Ln (S-L)6 (Ln = Dy (1S), Gd (2S)), whose crystal structures and magnetic properties have been characterized. Structural analysis indicated that the above clusters crystallize in the chiral P213 group space. The central lanthanide ion has a coordination geometry of D3 surrounded by three [CoIII(L)2]– anions using six aliphatic oxygen atoms of L2− featuring a star-shaped [CoIII3LnIII] configuration. Magnetic measurements showed the presence of slow magnetic relaxation with an effective energy barrier of 22.33 K in the DyIII derivatives under a zero-dc field. Furthermore, the circular dichroism (CD) spectra of 1R and 1S confirmed their enantiomeric nature. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

22. Synthesis, Crystal Structure and Magnetic Property of a Terbium Cluster.

Author

WANG Qi, ZHU Xiaoming, WANG Juntao, LI Zeyu, JI Liudi, and HU Peng

Subjects
MAGNETIC structure, TERBIUM, MAGNETIC crystals, MAGNETIC properties, CRYSTAL structure, MAGNETIC tunnelling, QUANTUM tunneling
Abstract

In this paper, a new nonanuclear terbium cluster {Tb9 (L)4 (μ4-OH)2 (μ3-OH)8 (μ2-OCH3)4 (NO3)8 (H2O)8} (OH)·2H2O(1) was synthesized by 2,6-dimethoxyphenol (HL) and Tb(NO3)2·6H2O. The cluster was characterized via XRD, elemental analysis, infrared spectrum and thermogravimetric analysis. The magnetic property were also studied. X-ray single-crystal diffraction analysis indicates that the cluster is orthorhombic, the space group is I222, the crystal cell parameters are a = 1. 532 8 (3) nm, b = 1. 796 9 (4) nm, c = 1. 863 5 (4) nm, α = β = γ = 90°, V = 5. 132 6 (19) nm³. The nonanuclear skeleton formed by metal centers in the cluster that connected by μ4-OH and μ3-OH presents an interesting hourglass like topology. The central Tb ion has a slightly twisted tetragonal pyramid geometry, while the other Tb ions have a slightly deformed dodecahedral configuration. Magnetic investigations reveal that the weak antiferromagnetic interactions between adjacent metal ions exist in cluster 1, but no obvious slow magnetic relaxation behavior is shown due to the rapid magnetic quantum tunneling effect. [ABSTRACT FROM AUTHOR]

Published
2023

25. Largely enhanced energy storage performance in multilayered ferroelectric polymer nanocomposites with optimized spatial arrangement of ceramic nanofillers

Author

Hu Peng, Xiaoming Zhu, Xin Yang, Li Zeyu, and Ji Liudi

Subjects
Materials science, Nanocomposite, Polymer nanocomposite, Nanoparticle, 02 engineering and technology, Dielectric, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Energy storage, Electrospinning, 0104 chemical sciences, Mechanics of Materials, visual_art, Ceramics and Composites, visual_art.visual_art_medium, Ceramic, Composite material, 0210 nano-technology, Power density
Abstract

Dielectric materials with ultrahigh power density play an important role in modern electrical applications. Herein, we propose and demonstrate a class of newly designed multilayered polymer nanocomposites prepared via a systemically optimized electrospinning method. These multilayered nanocomposites are stacked with P(VDF-HFP) layers and P(VDF-HFP)/BaTiO3 layers alternately. Our results uncover that the heptalayered nanocomposites present superior breakdown strength among five different multilayered composites, which is owing to the increased layers interfaces. The further tailored spatial arrangement of BaTiO3 nanoparticles (BT NPs) in the hierarchical structure offers an additional increment in breakdown strength and energy density. The synergistic effects of hierarchical structure and gradient distribution of nanofillers furnish the resulting nanocomposites with much enhanced collective energy storage properties including a largely enhanced energy density of 17 J cm−3 and an ultrahigh breakdown strength of 635 MV m−1. This work provides a feasible route to improve the energy storage performance for dielectric nanocomposites.

Published
2020

26. Largely enhanced Piezoelectric-Fenton capability in rationally designed PVDF/Fe2O3flexible porous film

Author

Yang, Xin, Ye, Fei, Li, Zeyu, Liu, Xiaoling, Chu, Jiaying, Xie, Bing, Ji, Liudi, Hu, Peng, Wang, Juntao, Du, Jifu, and Zhu, Xiaoming

Abstract

The burgeoning piezocatalysts have attracted huge attentions due to their ability to convert natural mechanical energy to degrade water pollutants. However, traditional powder-based piezocatalysts still face an inevitable bottleneck of the secondary pollution because of the diffusion of nanoparticles during the piezocatalysis process. In this work, novel porous polymer-based composite films combining Fenton fillers (α-Fe2O3) and ferroelectric polymer (polyvinylidene fluoride, PVDF) are prepared by rationally designed solution-casted method with a sacrificial “hard template” of table salt. The as-prepared porous PVDF/Fe2O3film exhibits superior decomposition efficiency of organic pollutants under ultrasonication. Particularly, the easily recyclable porous film with optimized composition and spatial structure offers an ultrahigh rate constant of 0.0498 min−1, which means it can degrade 94.8% rhodamine B (RhB) in 60 min, exceeding that of most reported polymer-based piezocatalysts. Additionally, it has a comprehensive decomposition effect on dyes, antibiotics and natural water with a good cycle performance. The outstanding degradation performance is attributed to the massive hydroxyl radical generated from the enhanced Piezoelectric-Fenton effect, which is ascribed to the synergistic effect of improved piezoelectricity in PVDF, enhanced hydrophilicity and optimized spatial structures in the porous composite films.

Published
2024
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results