Exfoliated polyurethane/montmorillonite nanocomposites with both high elongation at break and high tensilestrength were studied by dynamic-infrared spectroscopy (dynamic-IR). The results show that crystallization indu...Exfoliated polyurethane/montmorillonite nanocomposites with both high elongation at break and high tensilestrength were studied by dynamic-infrared spectroscopy (dynamic-IR). The results show that crystallization induced byadditional stress is impeded by the nano-layered organo montmorillonite.展开更多
The Hot deformation and martensitic transformation behaviors of Fe-32%Ni alloy was investigated by measurements of electrical resistance and X-ray diffraction. With the increase in strain, the austenite goes through f...The Hot deformation and martensitic transformation behaviors of Fe-32%Ni alloy was investigated by measurements of electrical resistance and X-ray diffraction. With the increase in strain, the austenite goes through from the work-hardened to the partial dynamcally re-crystallized and then to the completed dynamically re-crystallized. The martensitic transformation characteristics depend on the austenite states. The work-hardening in small strain is helpful to martensitic transformation due to the low dislocation density and little lattice distortion, while the high dislocation density and severe lattice distortion by the increase in strain will hinder the martensitic nucleation. Once dynamic re-crystallization （ DRX ） takes place, the martensitic transformation will be enhanced again, which is related to the heterogeneous dynamic substructures. The growing DRX grain can enhance the martensitic nucleation due to the low dislocation density near its grain boundary.展开更多
Tin-containing metal halide perovskites have enormous potential as photovoltaics,both in narrow band gap mixed tin−lead materials for all-perovskite tandems and for lead-free perovskites.The introduction of Sn(II),how...Tin-containing metal halide perovskites have enormous potential as photovoltaics,both in narrow band gap mixed tin−lead materials for all-perovskite tandems and for lead-free perovskites.The introduction of Sn(II),however,has significant effects on the solution chemistry,crystallization,defect states,and other material properties in halide perovskites.In this perspective,we summarize the main hurdles for tin-containing perovskites and highlight successful attempts made by the community to overcome them.We discuss important research directions for the development of these materials and propose some approaches to achieve a unified understanding of Sn incorporation.We particularly focus on the discussion of charge carrier dynamics and nonradiative losses at the interfaces between perovskite and charge extraction layers in p-i-n cells.We hope these insights will aid the community to accelerate the development of high-performance,stable single-junction tincontaining perovskite solar cells and all-perovskite tandems.展开更多
Comprehensive Summary In this work,we have successfully obtained a series of novel copper(I)–iodide clusters(CuI NCs)based assembly materials by combining supramolecular pseudorotaxane ligands{[Mebpe^(+)]PF_(6)^(–)@...Comprehensive Summary In this work,we have successfully obtained a series of novel copper(I)–iodide clusters(CuI NCs)based assembly materials by combining supramolecular pseudorotaxane ligands{[Mebpe^(+)]PF_(6)^(–)@CB[6](CB[6]=cucurbit[6]uril),L’·PF_(6)}and linkers{BPHF@CB[6],[BPHF=C_(14)H_(20)N_(4)(PF_(6))_(2)],L·PF_(6)},including discrete cluster CuI 1 and extended cluster organic frameworks MORF 1 and MORF 2.CuI 1 can be described as a dumbbell-shaped molecule with its body-centered site and two vertexes respectively occupied by one[Cu_(5)I_(6)]^(–)cluster and two CB[6]held together by two L’·PF_(6) ligands.The crystal structures of MORF 1 and MORF 2 are 1D anionic chain and four-fold interpenetrated 3D cationic diamondoid structure,respectively,which all featured intriguing alternating CB[6]and CuI NCs.展开更多
基金This work was supported by the National Natural Science Foundation of China (No. 20174048).
文摘Exfoliated polyurethane/montmorillonite nanocomposites with both high elongation at break and high tensilestrength were studied by dynamic-infrared spectroscopy (dynamic-IR). The results show that crystallization induced byadditional stress is impeded by the nano-layered organo montmorillonite.
基金the National Natural Science Foundation of China （No. 50471017）.
文摘The Hot deformation and martensitic transformation behaviors of Fe-32%Ni alloy was investigated by measurements of electrical resistance and X-ray diffraction. With the increase in strain, the austenite goes through from the work-hardened to the partial dynamcally re-crystallized and then to the completed dynamically re-crystallized. The martensitic transformation characteristics depend on the austenite states. The work-hardening in small strain is helpful to martensitic transformation due to the low dislocation density and little lattice distortion, while the high dislocation density and severe lattice distortion by the increase in strain will hinder the martensitic nucleation. Once dynamic re-crystallization （ DRX ） takes place, the martensitic transformation will be enhanced again, which is related to the heterogeneous dynamic substructures. The growing DRX grain can enhance the martensitic nucleation due to the low dislocation density near its grain boundary.
基金supported by JST-Mirai Program(JPMJMI22E2),NEDO,International Collaborative Research Program of ICR,Kyoto University,JSPS for a Research Fellowship for Young Scientists(21J14762)the China Scholarship Council(CSC)the UK Engineering and Physical Sciences Research Council(EPSRC)under projects EP/V027131/1 and EP/S516119/1 and the US Office of Naval Research(ONR)under award number N00014-20-1-2587.
文摘Tin-containing metal halide perovskites have enormous potential as photovoltaics,both in narrow band gap mixed tin−lead materials for all-perovskite tandems and for lead-free perovskites.The introduction of Sn(II),however,has significant effects on the solution chemistry,crystallization,defect states,and other material properties in halide perovskites.In this perspective,we summarize the main hurdles for tin-containing perovskites and highlight successful attempts made by the community to overcome them.We discuss important research directions for the development of these materials and propose some approaches to achieve a unified understanding of Sn incorporation.We particularly focus on the discussion of charge carrier dynamics and nonradiative losses at the interfaces between perovskite and charge extraction layers in p-i-n cells.We hope these insights will aid the community to accelerate the development of high-performance,stable single-junction tincontaining perovskite solar cells and all-perovskite tandems.
基金the National Natural Science Foundation of China(Nos.U21A20277,21975065,22101264,21825106)the China Postdoctoral Science Foundation(No.2021TQ0292)the Excellent Youth Foundation of Henan Scientific Committee(No.232300421022).
文摘Comprehensive Summary In this work,we have successfully obtained a series of novel copper(I)–iodide clusters(CuI NCs)based assembly materials by combining supramolecular pseudorotaxane ligands{[Mebpe^(+)]PF_(6)^(–)@CB[6](CB[6]=cucurbit[6]uril),L’·PF_(6)}and linkers{BPHF@CB[6],[BPHF=C_(14)H_(20)N_(4)(PF_(6))_(2)],L·PF_(6)},including discrete cluster CuI 1 and extended cluster organic frameworks MORF 1 and MORF 2.CuI 1 can be described as a dumbbell-shaped molecule with its body-centered site and two vertexes respectively occupied by one[Cu_(5)I_(6)]^(–)cluster and two CB[6]held together by two L’·PF_(6) ligands.The crystal structures of MORF 1 and MORF 2 are 1D anionic chain and four-fold interpenetrated 3D cationic diamondoid structure,respectively,which all featured intriguing alternating CB[6]and CuI NCs.
