Using a new approach based on the NMR spectroscopic analysis of the entire, unpurified spider venom,we identified a family of unusual sulfated nucleoside derivatives from the venom of the hobo spider,Tegenaria agresti...Using a new approach based on the NMR spectroscopic analysis of the entire, unpurified spider venom,we identified a family of unusual sulfated nucleoside derivatives from the venom of the hobo spider,Tegenaria agrestis.These compounds are ribonucleoside mono- and disulfates derived from guanosine and xanthosine, some of which are glycosylated, bearing one or two D-fucose units. The use of NMR spectroscopy to characterize the unfractionated venom was central to the discovery of this heretofore overlooked class of venom components.展开更多
Lithium metal is commonly regarded as the“Holy Grail”anode material for high energy density rechargeable batteries.However,the uncontrollable growth of Li dendrites has posed safety concerns and thus greatly hindere...Lithium metal is commonly regarded as the“Holy Grail”anode material for high energy density rechargeable batteries.However,the uncontrollable growth of Li dendrites has posed safety concerns and thus greatly hindered its large-scale application.Here we have modified the surface of a commercial anode current collector,Cu foil,with a thin layer of Zn by a facile electroplating method,in order to regulate the Li nucleation and the following growth processes.Because of the formation of a solid solution buffer layer and Li-Zn alloy phases,the Li nucleation overpotential was dramatically reduced,realizing a uniform Li nucleation and a smooth Li plating morphology.As a result,significantly improved long-term cycling performance with a high Coulombic efficiency was achieved by the lithiophilic Zn coated Cu foil as a current collector.Full cells of Li-LiFePO4 and Li-S using the Li deposited on the Zn modified Cu as the anode,showed increased capacity with low voltage hysteresis and greatly enhanced cycling stability,ascribed to the uniform Li deposition and formation of a stable SEI layer.This work demonstrates the feasibility of employing lithiophilic modified Cu foils as Li metal current collectors for practical applications.展开更多
Polaritons are quasi-particles composed of a superposition of excitons and photons that can be created within a strongly coupled optical microcavity.Here,we describe a structure in which a strongly coupled microcavity...Polaritons are quasi-particles composed of a superposition of excitons and photons that can be created within a strongly coupled optical microcavity.Here,we describe a structure in which a strongly coupled microcavity containing an organic semiconductor is coupled to a second microcavity containing a series of weakly coupled inorganic quantum wells.We show that optical hybridisation occurs between the optical modes of the two cavities,creating a delocalised polaritonic state.By electrically injecting electron–hole pairs into the inorganic quantum-well system,we are able to transfer energy between the cavities and populate organic-exciton polaritons.Our approach represents a new strategy to create highly efficient devices for emerging‘polaritonic’technologies.展开更多
文摘Using a new approach based on the NMR spectroscopic analysis of the entire, unpurified spider venom,we identified a family of unusual sulfated nucleoside derivatives from the venom of the hobo spider,Tegenaria agrestis.These compounds are ribonucleoside mono- and disulfates derived from guanosine and xanthosine, some of which are glycosylated, bearing one or two D-fucose units. The use of NMR spectroscopy to characterize the unfractionated venom was central to the discovery of this heretofore overlooked class of venom components.
基金the Cornell Center for Materials Research(CCMR)Shared Facilities with funding from the NSF MRSEC program[DMR-1719875].
文摘Lithium metal is commonly regarded as the“Holy Grail”anode material for high energy density rechargeable batteries.However,the uncontrollable growth of Li dendrites has posed safety concerns and thus greatly hindered its large-scale application.Here we have modified the surface of a commercial anode current collector,Cu foil,with a thin layer of Zn by a facile electroplating method,in order to regulate the Li nucleation and the following growth processes.Because of the formation of a solid solution buffer layer and Li-Zn alloy phases,the Li nucleation overpotential was dramatically reduced,realizing a uniform Li nucleation and a smooth Li plating morphology.As a result,significantly improved long-term cycling performance with a high Coulombic efficiency was achieved by the lithiophilic Zn coated Cu foil as a current collector.Full cells of Li-LiFePO4 and Li-S using the Li deposited on the Zn modified Cu as the anode,showed increased capacity with low voltage hysteresis and greatly enhanced cycling stability,ascribed to the uniform Li deposition and formation of a stable SEI layer.This work demonstrates the feasibility of employing lithiophilic modified Cu foils as Li metal current collectors for practical applications.
基金funding this paper via the Programme Grant‘Hybrid Polaritonics’(EP/M025330/1)。
文摘Polaritons are quasi-particles composed of a superposition of excitons and photons that can be created within a strongly coupled optical microcavity.Here,we describe a structure in which a strongly coupled microcavity containing an organic semiconductor is coupled to a second microcavity containing a series of weakly coupled inorganic quantum wells.We show that optical hybridisation occurs between the optical modes of the two cavities,creating a delocalised polaritonic state.By electrically injecting electron–hole pairs into the inorganic quantum-well system,we are able to transfer energy between the cavities and populate organic-exciton polaritons.Our approach represents a new strategy to create highly efficient devices for emerging‘polaritonic’technologies.
