The development of degradable and recyclable polymers is an attractive strategy to tackle the post-consumption pollution issue of commercial ***-acyclic monomers metathesis polymerization(CAMMP)has been recently repor...
详细信息
The development of degradable and recyclable polymers is an attractive strategy to tackle the post-consumption pollution issue of commercial ***-acyclic monomers metathesis polymerization(CAMMP)has been recently reported to produce degradable thermoset,thermoplastic and elastomeric polymers,and their degradability is enabled with addition of various *** this contribution,we demonstrate that the utilization of diene comonomers containing photodegradable moiety can give access to thermoset and thermoplastic materials bearing photo-degradation *** copolymerization of a series easily accessible diene comonomers bearing photodegradable ortho-nitrobenzyl moieties with dicyclopentadiene(DCPD)or cyclooctene(COE)leads to the formation of photodegradable p DCPD thermosets and p COE thermoplastic polymers with mechanical properties comparable to their non-degradable *** importantly,their photo-degradation properties can be efficiently tuned with the addition of ultraviolet absorber during in-situ polymerization.
Two polyamides (PAs) (PA1 and PA2) with three electroactive nitrogen atoms within triphenylamine (TPA)-containing structures were synthesized from two diamine monomers, 4,4′-bis[(2,4-dimethoxyphenyl)(4-aminophenyl)am...
详细信息
Elastomers with high mechanical toughness can guarantee their durability during service ***-healing ability,as well as recyclability,can also extend the life of materials and save the consuming cost of the *** efforts...
详细信息
Elastomers with high mechanical toughness can guarantee their durability during service ***-healing ability,as well as recyclability,can also extend the life of materials and save the consuming cost of the *** efforts have been dedicated to promoting the mechanical toughness as well as the self-healing capability of elastomers at the same time,while it remains a challenge to balance the trade-off between the above properties in one *** we proposed a molecular design driven by dual interactions of acylsemicarbazide hydrogen bonding and Cu^(2+)-neocuproine coordination *** introducing the reversible multiple hydrogen bonds and strong coordination bonds,we successfully fabricated an extremely tough and self-healing *** elastomer can achieve an impressive top-notch toughness of 491 MJ/m^(3).Furthermore,it boasted rapid elastic restorability within 10 min and outstanding crack tolerance with high fracture energy(152.6kJ/m^(2)).Benefiting from the combination of dynamic interactions,the material was able to self-repair under 80℃conveniently and could be reprocessed to restore the exceptional mechanical properties.
Metal-nitrogen-carbon complexes are emerging as efficient electrocatalysts for the oxygen evolution reaction (OER) owing to the excellent activity, stability, natural abundance, and cost-effectiveness of these complex...
详细信息
Two new ratiometric hypoxia probes(Ir-C343 and Ir-GFP)are synthesized by covalently incorporating florescent internal standard molecules coumarin 343(C343)and green fluorescent protein(GFP)into bis[1-(9,9-dimethyl-9H-...
详细信息
Two new ratiometric hypoxia probes(Ir-C343 and Ir-GFP)are synthesized by covalently incorporating florescent internal standard molecules coumarin 343(C343)and green fluorescent protein(GFP)into bis[1-(9,9-dimethyl-9H-fluoren-2-yl)-isoquinoline](succinylacetone)Ir(Ⅲ)(Ir-fliq),*** connecting with internal standard molecules,the Ir-fliq moiety still exhibits high sensitivity to oxygen concentration,while the fluorescence intensity of the internal standard remains relatively constant under different oxygen *** a result,a ratiometric response is realized that is only related to oxygen *** addition,Ir-GFP shows more promising applications in the ratiometric hypoxia imaging of cells due to its long excitation wavelength,good water solubility,high biocompatibility,and low relative fluorescence intensity compared with the phosphorescent emitter Ir-fliq.
Development and understanding of highly mechanically robust and electronically conducting hydrogels are extremely important for ever-increasing energy-based *** mixing/blending of conductive additives with hydrophilic...
详细信息
Development and understanding of highly mechanically robust and electronically conducting hydrogels are extremely important for ever-increasing energy-based *** mixing/blending of conductive additives with hydrophilic polymer network prevents both high mechanical strength and electronic conductivity to be presented in polymer ***,we proposed a double-network(DN)engineering strategy to fabricate PVA/PPy DN hydrogels,consisting of a conductive PPy-PA network via in-situ ultrafast gelation and a tough PVA network via a subsequent freezing/thawing *** resultant PVA/PPy hydrogels exhibited superior mechanical and electrochemical properties,including electrical conductivity of~6.8 S/m,mechanical strength of~0.39 MPa,and elastic moduli of~0.1 *** further transformation of PVA/PPy hydrogels into supercapacitors,they demonstrated a high capacitance of~280.7 F/g and a cycle life of 2000 galvanostatic charge/discharge cycles with over 94.3%capacity retention at the current density of 2 mA/cm2 and even subzero temperatures of−20℃.Such enhanced mechanical performance and electronic conductivity of hydrogels are mainly stemmed from a synergistic combination of continuous electrically conductive PPy-PA network and the two interpenetrating DN *** in-situ gelation strategy is applicable to the integration of ionic-/electrical-conductive materials into DN hydrogels for smart-soft electronics,beyond the most commonly used PEDOT:PSS-based hydrogels.
Progress in the fast charging of high-capacity silicon monoxide(SiO)-based anode is currently hindered by insufficient conductivity and notable volume *** construction of an interface conductive network effectively ad...
详细信息
Progress in the fast charging of high-capacity silicon monoxide(SiO)-based anode is currently hindered by insufficient conductivity and notable volume *** construction of an interface conductive network effectively addresses the aforementioned problems;however,the impact of its quality on lithium-ion transfer and structure durability is yet to be ***,the influence of an interface conductive network on ionic transport and mechanical stability under fast charging is explored for the first time.2D modeling simulation and Cryo-transmission electron microscopy precisely reveal the mitigation of interface polarization owing to a higher fraction of conductive inorganic species formation in bilayer solid electrolyte interphase is mainly responsible for a linear decrease in ionic diffusion energy ***,atomic force microscopy and Raman shift exhibit substantial stress dissipation generated by a complete conductive network,which is critical to the linear reduction of electrode residual *** study provides insights into the rational design of optimized interface SiO-based anodes with reinforced fast-charging performance.
Nanopore sequencing harnesses changes in ionic current as nucleotides traverse a nanopore,enabling real-time decoding of DNA/RNA *** instruments for the dynamic behavior of substances in the nanopore on the molecular ...
详细信息
Nanopore sequencing harnesses changes in ionic current as nucleotides traverse a nanopore,enabling real-time decoding of DNA/RNA *** instruments for the dynamic behavior of substances in the nanopore on the molecular scale are still very limited *** study employs all-atom molecular dynamics(MD)simulations to explore the impact of charge densities on graphene nanopore in the translocation of single-stranded DNA(ssDNA).We find that the magnitude of graphene’s charge,rather than the charge disparity between ssDNA and graphene,significantly influences ssDNA adsorption and translocation ***,high negative charge densities on graphene nanopores are shown to substantially slow down ssDNA translocation,highlighting the importance of hydrodynamic effects and electrostatic *** indicates translocation is crucial for achieving distinct ionic current blockades,which plays a central role for DNA sequencing *** findings suggest that negatively charged graphene nanopores hold considerable potential for optimizing DNA sequencing,marking a critical advancement in this field.
暂无评论