CONSPECTUS:The production of cement is a key indicator of a region’s level of development.As such,its use is essential for any society aiming to create healthy,comfortable,safe and secure living and working environme...CONSPECTUS:The production of cement is a key indicator of a region’s level of development.As such,its use is essential for any society aiming to create healthy,comfortable,safe and secure living and working environments.However,these benefits come at a price;Portland cement production accounts for≈8%of the total anthropogenic CO_(2)emissions.If cement fabrication was considered a country,it would rank as the third largest emitter,after China and the United States.Consequently,reducing the CO_(2)footprint of the construction industry is a societal need.Numerous low-carbon cement alternatives have been proposed,primarily involving the partial substitution of Portland clinker with materials that possess much lower CO_(2)footprints.However,these cements have not been widely adopted because they exhibit reduced mechanical strength at 1 day of hydration,failing to meet current practices for formwork stripping.Therefore,a primary objective is to elucidate the mechanisms of early age cement hydration to accelerate their hydration rates.展开更多
The difficulty of obtaining high-intensity localized light spots for optical probes leads to their lack of good applications in nanoimaging.Here we demonstrate a Fabry–Pérot resonance flat-based plasmonic fiber prob...The difficulty of obtaining high-intensity localized light spots for optical probes leads to their lack of good applications in nanoimaging.Here we demonstrate a Fabry–Pérot resonance flat-based plasmonic fiber probe(FPFP).The simulation results show that the probe can obtain a nanofocusing spot at the tip with the radially polarized mode.The Fabry–Pérot interference structure is used to control the plasmon propagation on the surface of the probe,it effectively improves the local spot intensity at the tip.Furthermore,the experimental results verify that the FPFP(tip curvature radius is 20 nm)prepared by chemical etching method can obtain a nanofocusing spot at the tip.The nanoimaging of the gold slit structure demonstrates the nanoimaging capability of the FPFP,the 36.9 nm slit width is clearly identified by the FPFP.展开更多
Tip-enhanced Raman spectroscopy(TERS)is a powerful surface analysis technique that can provide subnanometer-resolved images of nanostructures with site-specific chemical fingerprints.However,due to the limitation of w...Tip-enhanced Raman spectroscopy(TERS)is a powerful surface analysis technique that can provide subnanometer-resolved images of nanostructures with site-specific chemical fingerprints.However,due to the limitation of weak Raman signals and the resultant difficulty in achieving TERS imaging with good signal-to-noise ratios(SNRs),the conventional single-peak analysis is unsuitable for distinguishing complex molecular architectures at the subnanometer scale.Here we demonstrate that the combination of subnanometer-resolved TERS imaging and advanced multivariate analysis can provide an unbiased panoramic view of the chemical identity and spatial distribution of different molecules on surfaces,yielding high-quality chemical images despite limited SNRs in individual pixel-level spectra.This methodology allows us to exploit the full power of TERS imaging and unambiguously distinguish between adjacent molecules with a resolution of~0.4 nm,as well as to resolve submolecular features and the differences in molecular adsorption configurations.Our results provide a promising methodology that promotes TERS imaging as a routine analytical technique for the analysis of complex nanostructures on surfaces.展开更多
基金funding from the European Research Council(ERC-AdG)under the European Union’s Horizon Europe research and innovation program[grant agreement No.101139298,“Imaging the hydration of low-carbon CEMents with SYNchrotron X-rays(syn4cem)]”,2025/01−2029/12Partial funding from PID2020−114650RB-I00 grant(Agencia Estatal de Investigació,Spain)cofunded by ERDF.
文摘CONSPECTUS:The production of cement is a key indicator of a region’s level of development.As such,its use is essential for any society aiming to create healthy,comfortable,safe and secure living and working environments.However,these benefits come at a price;Portland cement production accounts for≈8%of the total anthropogenic CO_(2)emissions.If cement fabrication was considered a country,it would rank as the third largest emitter,after China and the United States.Consequently,reducing the CO_(2)footprint of the construction industry is a societal need.Numerous low-carbon cement alternatives have been proposed,primarily involving the partial substitution of Portland clinker with materials that possess much lower CO_(2)footprints.However,these cements have not been widely adopted because they exhibit reduced mechanical strength at 1 day of hydration,failing to meet current practices for formwork stripping.Therefore,a primary objective is to elucidate the mechanisms of early age cement hydration to accelerate their hydration rates.
基金the National Science Fund for Distinguished Young Scholars(No.52225507).
文摘The difficulty of obtaining high-intensity localized light spots for optical probes leads to their lack of good applications in nanoimaging.Here we demonstrate a Fabry–Pérot resonance flat-based plasmonic fiber probe(FPFP).The simulation results show that the probe can obtain a nanofocusing spot at the tip with the radially polarized mode.The Fabry–Pérot interference structure is used to control the plasmon propagation on the surface of the probe,it effectively improves the local spot intensity at the tip.Furthermore,the experimental results verify that the FPFP(tip curvature radius is 20 nm)prepared by chemical etching method can obtain a nanofocusing spot at the tip.The nanoimaging of the gold slit structure demonstrates the nanoimaging capability of the FPFP,the 36.9 nm slit width is clearly identified by the FPFP.
基金supported by the National Natural Science Foundation of Chinathe National Basic Research Program of China+1 种基金the Strategic Priority Research Program of the Chinese Academy of Sciencessupport from the NSFC’s 1000 Young Talents Recruitment Plan for Global Experts.
文摘Tip-enhanced Raman spectroscopy(TERS)is a powerful surface analysis technique that can provide subnanometer-resolved images of nanostructures with site-specific chemical fingerprints.However,due to the limitation of weak Raman signals and the resultant difficulty in achieving TERS imaging with good signal-to-noise ratios(SNRs),the conventional single-peak analysis is unsuitable for distinguishing complex molecular architectures at the subnanometer scale.Here we demonstrate that the combination of subnanometer-resolved TERS imaging and advanced multivariate analysis can provide an unbiased panoramic view of the chemical identity and spatial distribution of different molecules on surfaces,yielding high-quality chemical images despite limited SNRs in individual pixel-level spectra.This methodology allows us to exploit the full power of TERS imaging and unambiguously distinguish between adjacent molecules with a resolution of~0.4 nm,as well as to resolve submolecular features and the differences in molecular adsorption configurations.Our results provide a promising methodology that promotes TERS imaging as a routine analytical technique for the analysis of complex nanostructures on surfaces.
