The characteristics of quartz-hosted fluid inclusions in fluvial sediments from five locations in the upstream,midstream,and estuary of the Changjiang River,China,are analyzed.The sources of sediments are discussed co...The characteristics of quartz-hosted fluid inclusions in fluvial sediments from five locations in the upstream,midstream,and estuary of the Changjiang River,China,are analyzed.The sources of sediments are discussed concerning their differences in the shape,size,number,gas percentage and genetic type of quartz-hosted fluid inclusions.From upstream to downstream,the characteristics of quartz-hosted fluid inclusions in sediments are different.The fluid inclusion types in the samples from upstream to estuary are gradually enriched.The sediment influx from the tributaries of the Changjiang River makes new types of quartz-hosted fluid inclusions in the downstream and estuary.In terms of the number and size,most quartz-hosted fluid inclusions are concentrated in the range of 2-4μm in diameters and 10-150 in number per 10^-3 mm^3.The number and size ranges of the fluid inclusions from different positions are also different.The fluid inclusions in the sample collected from the Shigu,upstream of the Changjiang River,are 2-18μm in size,with the number of 2-166 per 10^-3 mm^3.Among the samples collected from Yibin,Yichang and Wuhan,the sizes of fluid inclusions are 2-15,2-10,2-12μm,with the number of 1-270,2-220,and 1^-308 per 10^-3 mm^3,respectively.The proportion of primary fluid inclusions in the sample of the upstream(14%)is higher than that of the midstream(6%-8%)and the estuary(5%),suggesting that different types of source rocks have been input into the river by the tributaries.The characteristics of quartz-hosted fluid inclusions in the fluvial sediments could offer a new perspective for exploration of the source of sediments.展开更多
Enhancing the mechanical performance of synthetic fibers is pursued in aerospace,wearable devices,and protective textiles.However,current reinforcement methods rely on the chemical modification of polymer stock,introd...Enhancing the mechanical performance of synthetic fibers is pursued in aerospace,wearable devices,and protective textiles.However,current reinforcement methods rely on the chemical modification of polymer stock,introducing greater complexity and processing challenge.In this work,the mechanical properties of different aramid fibers and their composite fibers are improved through a cool spinning strategy.By reducing the coagulation temperature to -25℃,the interactions between polymer chains and solvent molecules are substantially enhanced,thereby improving the drawability of the polymer solution.The draw ratio markedly increases typically from 200% to 380%,leading to optimized oriented and crystalline structures.Consequently,the tensile strength,Young’s modulus and toughness of large-diameter heterocyclic para-aramid fibers increase by 112%,123% and 118%,respectively.The cool spinning proposal is further applied to 36-μm-thick heterocyclic paraaramid/graphene oxide composite fibers,realizing elevated tensile strength,Young’s modulus and toughness of 6.28 GPa,119.62 GPa and 172.7 MJ·m^(-3),respectively.This strategy is also applicable to meta-aramid fibers,where tensile strength increases up to 1.35 GPa.The simple and universal cool spinning approach opens an avenue towards the preparation of high-performance fibers and composite fibers for structural and functional applications.展开更多
基金This study was supported by the National Basic Research Program of China(No.2013CB956504).
文摘The characteristics of quartz-hosted fluid inclusions in fluvial sediments from five locations in the upstream,midstream,and estuary of the Changjiang River,China,are analyzed.The sources of sediments are discussed concerning their differences in the shape,size,number,gas percentage and genetic type of quartz-hosted fluid inclusions.From upstream to downstream,the characteristics of quartz-hosted fluid inclusions in sediments are different.The fluid inclusion types in the samples from upstream to estuary are gradually enriched.The sediment influx from the tributaries of the Changjiang River makes new types of quartz-hosted fluid inclusions in the downstream and estuary.In terms of the number and size,most quartz-hosted fluid inclusions are concentrated in the range of 2-4μm in diameters and 10-150 in number per 10^-3 mm^3.The number and size ranges of the fluid inclusions from different positions are also different.The fluid inclusions in the sample collected from the Shigu,upstream of the Changjiang River,are 2-18μm in size,with the number of 2-166 per 10^-3 mm^3.Among the samples collected from Yibin,Yichang and Wuhan,the sizes of fluid inclusions are 2-15,2-10,2-12μm,with the number of 1-270,2-220,and 1^-308 per 10^-3 mm^3,respectively.The proportion of primary fluid inclusions in the sample of the upstream(14%)is higher than that of the midstream(6%-8%)and the estuary(5%),suggesting that different types of source rocks have been input into the river by the tributaries.The characteristics of quartz-hosted fluid inclusions in the fluvial sediments could offer a new perspective for exploration of the source of sediments.
基金supported by the National Natural Science Foundation of China(Grant Nos.52090031,52090030 and 52272046)National Key Research and Development Program of China(Grant Nos.2022YFA1205300 and 2022YFA1205301)+4 种基金"Pioneer"and"Leading Goose"R&D Program of Zhejiang(Grant No.2023C01190)Natural Science Foundation of Zhejiang Province(Grant No.LR23E020003)Fundamental Research Funds for the Central Universities(Grant Nos.226-2024-00074 and 226-2024-00172)Shanxi-Zheda Institute of New Materials and Chemical Engineering(Grant Nos.2022SZ-TD011,2022SZ-TD012 and 2022SZ-TD014)the fellowship of China National Postdoctoral Program for Innovative Talents(Grant No.BX20230309).
文摘Enhancing the mechanical performance of synthetic fibers is pursued in aerospace,wearable devices,and protective textiles.However,current reinforcement methods rely on the chemical modification of polymer stock,introducing greater complexity and processing challenge.In this work,the mechanical properties of different aramid fibers and their composite fibers are improved through a cool spinning strategy.By reducing the coagulation temperature to -25℃,the interactions between polymer chains and solvent molecules are substantially enhanced,thereby improving the drawability of the polymer solution.The draw ratio markedly increases typically from 200% to 380%,leading to optimized oriented and crystalline structures.Consequently,the tensile strength,Young’s modulus and toughness of large-diameter heterocyclic para-aramid fibers increase by 112%,123% and 118%,respectively.The cool spinning proposal is further applied to 36-μm-thick heterocyclic paraaramid/graphene oxide composite fibers,realizing elevated tensile strength,Young’s modulus and toughness of 6.28 GPa,119.62 GPa and 172.7 MJ·m^(-3),respectively.This strategy is also applicable to meta-aramid fibers,where tensile strength increases up to 1.35 GPa.The simple and universal cool spinning approach opens an avenue towards the preparation of high-performance fibers and composite fibers for structural and functional applications.
