Vapor deposition is a promising technique for industrializing perovskite solar cells,but limited understanding of crystallization mechanisms in vapor-phase processes hampers progress.This study reveals a top-down crys...Vapor deposition is a promising technique for industrializing perovskite solar cells,but limited understanding of crystallization mechanisms in vapor-phase processes hampers progress.This study reveals a top-down crystallization growth mechanism during a two-step vapor-solid reaction and introduces an accelerated diffusion-buried homogeneous seed(AD-BHS)strategy.By utilizing the rapid diffusion of methylammonium chloride and inducing crystallization with buried seeds,we eliminate residual lead iodide,reduce crystallization time disparities across the film,and enhance uniformity.As a result,we achieve efficiencies of 22.40%for small-area(0.148 cm^(2))cells and 19.75%for large-area(10.0 cm^(2))modules,both representing state-of-the-art performance for vapor-solid reaction-based perovskite solar cells.This study provides critical insights into regulating crystallization growth in vapor-deposited perovskite thin films.展开更多
Surgical repair with artificial chordae replacement has emerged asa standard treatment for mitral regurgitation. Expanded polytetrafluoroethylene (ePTFE) sutures are commonly employed asartificial chordae;however, the...Surgical repair with artificial chordae replacement has emerged asa standard treatment for mitral regurgitation. Expanded polytetrafluoroethylene (ePTFE) sutures are commonly employed asartificial chordae;however, they have certain limitations, such aspotential long-term rupture and undesired material/tissueresponse. This study introduces a novel approach to artificialchordae design, termed the New Artificial Chordae (NAC), whichincorporates a double-layered structure. The NAC comprises amulti-strand braided core composed of ultra-high molecularweight polyethylene (UHMWPE) fibers as the inner core, and anouter tube made of hydrophobic porous ePTFE. Compared totraditional ePTFE sutures, NAC exhibits increased flexibility,enhanced tensile strength, longer elongation and improved fatigue resistance. Moreover, NAC exhibits a more hydrophobic surface,which contributes to enhanced hemocompatibility. The study also includes in vivo investigations conducted on animal models to evaluate the biocompatibility and functional efficacy of the artificial chordae. These experiments demonstrate the enhanced durability andbiocompatibility of the NAC, characterized by improved mechanical strength, minimal tissue response and reduced thrombus formation.These findings suggest the potential application of NAC as a prosthetic chordae replacement, offering promising prospects to address thelimitations associated with current artificial chordae materials and providing novel ideas and approaches for the development of sustainable and biocompatible regenerative biomaterials.展开更多
基金financial support by the Joint Foundation for Innovation and Development of Hubei Natural Science Foundation(2023AFD032)Hubei Provincial Natural Science Foundation of China(2023AFA010)。
文摘Vapor deposition is a promising technique for industrializing perovskite solar cells,but limited understanding of crystallization mechanisms in vapor-phase processes hampers progress.This study reveals a top-down crystallization growth mechanism during a two-step vapor-solid reaction and introduces an accelerated diffusion-buried homogeneous seed(AD-BHS)strategy.By utilizing the rapid diffusion of methylammonium chloride and inducing crystallization with buried seeds,we eliminate residual lead iodide,reduce crystallization time disparities across the film,and enhance uniformity.As a result,we achieve efficiencies of 22.40%for small-area(0.148 cm^(2))cells and 19.75%for large-area(10.0 cm^(2))modules,both representing state-of-the-art performance for vapor-solid reaction-based perovskite solar cells.This study provides critical insights into regulating crystallization growth in vapor-deposited perovskite thin films.
基金supported by National Key Research and Development Program 2022YFC2409100Chinese Academy of Medical Sciences(CAMS)Innovation Fund for Medical Sciences[CIFMS,(no.2021-I2M-5-013)]111 Project[The Program of Introducing Talents of Discipline to Universities(no.B16033)].
文摘Surgical repair with artificial chordae replacement has emerged asa standard treatment for mitral regurgitation. Expanded polytetrafluoroethylene (ePTFE) sutures are commonly employed asartificial chordae;however, they have certain limitations, such aspotential long-term rupture and undesired material/tissueresponse. This study introduces a novel approach to artificialchordae design, termed the New Artificial Chordae (NAC), whichincorporates a double-layered structure. The NAC comprises amulti-strand braided core composed of ultra-high molecularweight polyethylene (UHMWPE) fibers as the inner core, and anouter tube made of hydrophobic porous ePTFE. Compared totraditional ePTFE sutures, NAC exhibits increased flexibility,enhanced tensile strength, longer elongation and improved fatigue resistance. Moreover, NAC exhibits a more hydrophobic surface,which contributes to enhanced hemocompatibility. The study also includes in vivo investigations conducted on animal models to evaluate the biocompatibility and functional efficacy of the artificial chordae. These experiments demonstrate the enhanced durability andbiocompatibility of the NAC, characterized by improved mechanical strength, minimal tissue response and reduced thrombus formation.These findings suggest the potential application of NAC as a prosthetic chordae replacement, offering promising prospects to address thelimitations associated with current artificial chordae materials and providing novel ideas and approaches for the development of sustainable and biocompatible regenerative biomaterials.
