The possibilities of magnetism induced by transition-metal atoms substitution in Bi2Te3 system are investigated by ab initio calculations. The calculated results indicate that a transition-metal atom substitution for ...The possibilities of magnetism induced by transition-metal atoms substitution in Bi2Te3 system are investigated by ab initio calculations. The calculated results indicate that a transition-metal atom substitution for a Bi atom produces magnetic moments, which are due to the spin-polarization of transition-metal 3d electrons. The values of magnetic moments are 0.92, 1.97, 2.97, 4.04, and 4.98 μB for 4% Ti-, V-, Cr-, Mn- and Fe-doped Bi2Te3 re- spectively. When substituting two transition-metal atoms, the characteristics of exchanging couple depend upon the distributions of the Bi atoms substituted. When two transition- metal atoms substituting for Bi atoms locate at the sites of Bil and Bi5, with the distance of 11.52A, the Bi1.84TM0.16Te3 system is energetically most stable and exhibits ferromagnetic coupling.展开更多
Halide perovskite materials have received considerable attention for solar cells,LEDs,lasers etc.owing to their controllable physicochemical properties and structural advantages.However,little research has focused on ...Halide perovskite materials have received considerable attention for solar cells,LEDs,lasers etc.owing to their controllable physicochemical properties and structural advantages.However,little research has focused on energy storage and conversion applications,such as use as anodes in lithium-ion batteries.In this paper,all-inorganic lead-free halide perovskite Cs_(3)Bi_(2)Cl_(9)powders were synthesized by the grinding method,and the lattice was successfully adjusted via introducing Mn^(2+).The characterization results show that Mn-ion substitution can cause local lattice distortion to restructure the lattice,which will cause a mixed arrangement of[BiCl_(6)]octahedra to improve the performance of the anode material.This new material can provide a feasible solution for solving the problem of low specific capacity anode materials caused by unstable crystal structures,and also indicates that such perovskites with unique crystal structures and lattice tunability have broad application prospects in lithium-ion batteries.展开更多
背景:许多研究将静电纺丝应用于人工硬膜替代物的研究中,设计了具有多功能的人工硬膜,不仅可以更好地模拟天然硬膜结构,还能发挥促愈合、防粘连、抗菌等生物学功能。目的:系统总结静电纺丝技术应用于人工硬膜替代物中的研究进展。方法:...背景:许多研究将静电纺丝应用于人工硬膜替代物的研究中,设计了具有多功能的人工硬膜,不仅可以更好地模拟天然硬膜结构,还能发挥促愈合、防粘连、抗菌等生物学功能。目的:系统总结静电纺丝技术应用于人工硬膜替代物中的研究进展。方法:以“静电纺丝硬膜,硬膜替代物,人工硬膜补片”为中文检索词,以“electrospinning dura mater,dura mater substitute,artificial dura mater patch”为英文检索词,分别检索中国知网、万方数据库和PubMed数据库,文献检索时限为各数据库建库至2024年9月,通过阅读题目和摘要进行初步筛选,排除与文章相关性较低的文献,最终纳入64篇文献进行归纳总结。结果与结论:人工硬膜主要分为不可降解和可降解两大类,在修复硬膜损伤中发挥重要作用,也是目前生物组织工程研究的热点。静电纺丝技术可通过结合化学、材料学、药学等学科从结构和功能需求上进行人工硬膜替代物的设计,制备出仿生取向纤维型、不对称双层型、多层复合型等一系列新型人工硬膜,同时还赋予人工硬膜密封、防粘连、抗菌和促进神经组织修复等多种重要的生物功能,使得人工硬膜由过去传统的单纯补片转变为多功能的组织生物支架。静电纺丝为以后开发和研究更加理想的人工硬膜替代物提供了帮助,也为解决硬膜损伤修复问题带来新的思路。展开更多
文摘The possibilities of magnetism induced by transition-metal atoms substitution in Bi2Te3 system are investigated by ab initio calculations. The calculated results indicate that a transition-metal atom substitution for a Bi atom produces magnetic moments, which are due to the spin-polarization of transition-metal 3d electrons. The values of magnetic moments are 0.92, 1.97, 2.97, 4.04, and 4.98 μB for 4% Ti-, V-, Cr-, Mn- and Fe-doped Bi2Te3 re- spectively. When substituting two transition-metal atoms, the characteristics of exchanging couple depend upon the distributions of the Bi atoms substituted. When two transition- metal atoms substituting for Bi atoms locate at the sites of Bil and Bi5, with the distance of 11.52A, the Bi1.84TM0.16Te3 system is energetically most stable and exhibits ferromagnetic coupling.
基金supported by the Foundation of Yunnan Province(Nos.202301AU070021,202201BE070001-027)the Test Foundation of KUST(No.2022T20210208).
文摘Halide perovskite materials have received considerable attention for solar cells,LEDs,lasers etc.owing to their controllable physicochemical properties and structural advantages.However,little research has focused on energy storage and conversion applications,such as use as anodes in lithium-ion batteries.In this paper,all-inorganic lead-free halide perovskite Cs_(3)Bi_(2)Cl_(9)powders were synthesized by the grinding method,and the lattice was successfully adjusted via introducing Mn^(2+).The characterization results show that Mn-ion substitution can cause local lattice distortion to restructure the lattice,which will cause a mixed arrangement of[BiCl_(6)]octahedra to improve the performance of the anode material.This new material can provide a feasible solution for solving the problem of low specific capacity anode materials caused by unstable crystal structures,and also indicates that such perovskites with unique crystal structures and lattice tunability have broad application prospects in lithium-ion batteries.
文摘背景:许多研究将静电纺丝应用于人工硬膜替代物的研究中,设计了具有多功能的人工硬膜,不仅可以更好地模拟天然硬膜结构,还能发挥促愈合、防粘连、抗菌等生物学功能。目的:系统总结静电纺丝技术应用于人工硬膜替代物中的研究进展。方法:以“静电纺丝硬膜,硬膜替代物,人工硬膜补片”为中文检索词,以“electrospinning dura mater,dura mater substitute,artificial dura mater patch”为英文检索词,分别检索中国知网、万方数据库和PubMed数据库,文献检索时限为各数据库建库至2024年9月,通过阅读题目和摘要进行初步筛选,排除与文章相关性较低的文献,最终纳入64篇文献进行归纳总结。结果与结论:人工硬膜主要分为不可降解和可降解两大类,在修复硬膜损伤中发挥重要作用,也是目前生物组织工程研究的热点。静电纺丝技术可通过结合化学、材料学、药学等学科从结构和功能需求上进行人工硬膜替代物的设计,制备出仿生取向纤维型、不对称双层型、多层复合型等一系列新型人工硬膜,同时还赋予人工硬膜密封、防粘连、抗菌和促进神经组织修复等多种重要的生物功能,使得人工硬膜由过去传统的单纯补片转变为多功能的组织生物支架。静电纺丝为以后开发和研究更加理想的人工硬膜替代物提供了帮助,也为解决硬膜损伤修复问题带来新的思路。
