CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Wei Cai,Zhaoxin Li,Heng Xie,Wei Wang,Tianyang Cui,Bicheng Lin,Liangyuan Qi,Xin Hu,Yu Du,Yang Ming,Shuo Shi,Daming Chen,Bin Fei,Weiyi Xing,Yuan Hu
Seasonable and spontaneous replacement approach of daytime radiative cooling to solar thermal conversion is challenging yet imperative for year-round thermal management materials. Meanwhile, the fire safety of thermal management materials is extremely important but often overlooked. Herein, we report a bio-inspired and fireproof aerogel presenting dynamically self-switchable ability of daytime radiative cooling and solar thermal conversion, composed of thermochromic microcapsules (TC), boron nitride nanosheets (BN), and bio-based materials (alginate and phytate). In hot environments, TC/BN composite aerogel shows solar reflectivity of 91.8 % and IR emissivity of 84.3 %, promoting heat radiation to outer space and achieving an average temperature drop of ∼5.62 °C. Attributed to the thermochromic mechanism, TC/BN composite aerogel can harvest visible light of 87 % in the solar spectrum to increase the material temperature by 28.3 °C, under an environment of −8.8 °C. Based on the EnergyPlus simulation, the employment of TC/BN composite aerogel contributes to decreasing the energy consumption of buildings in both hot and cold regions, including Cairo, Singapore, Alaska, Yakutsk, and so on. Besides, the peak values of heat release rate and total heat release during the combustion of TC/BN composite aerogels are significantly decreased by 70.6 % and 58.4 %, compared to those of TC composite aerogel. The produced protective char layer enhanced by BN nanosheets is capable of isolating the fire and suppressing the fire propagation, improving the fire safety of composite aerogels designed. The TC/BN composite aerogels provide a smart thermal regulation mode for radiative cooling and solar heating, overcome the problems from changing weather and environment, and significantly promote the practical application by enhanced fire safety.
研究领域:
材料科学
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能源工程
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消防安全
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2020
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IF 3.408
Gongqing Chen,Bihe Yuan,Yuanyuan Zhan,Huaming Dai,Song He,Xianfeng Chen
Electrical fire is the most frequently occurred fire accident, and fire sensors with self-cutting and ultrasensitive fire-alarm response capability are urgent to be designed and developed. Herein, conductive reduced graphene oxide paper (RGOP) with hierarchical structure is prepared by a facile evaporation-assisted self-assembly of graphene oxide (GO) dispersion and then reduction by hydrazine hydrate vapor. The oxidative decomposition of RGOP containing sodium chloride (RGOP-NaCl) is promoted by the addition of NaCl. When being exposed to flame, RGOP-NaCl strips are readily ruptured. Based on this distinctive self-cutting performance of RGOP-NaCl under fire attacking, a novel fire detection and alarm device is designed by establishing controlling and operation circuits. Under fire encountering, an ultrafast warning response (approximately 5.3 s) of RGOP-NaCl is triggered. Fire-alarm time of RGOP-NaCl is adjustable by varying the content of NaCl. Furthermore, this RGOP-NaCl has the function of fuse and can cut off the conductive circuit timely under fire attacking. This finding will provide a novel thought for the design of advanced fire-alarm sensor and will also expand the application of graphene paper.
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
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2024
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IF 4.1
Faliang Gou,Wenwen Jiang,Ju Ke,Jingchen Chen,Xu Jiang
The copolymerization of polylactic acid with other monomers or polymers can enhance its performance and expand its range of applications. In this work, a range of metalloporphyrin catalysts featuring diverse substituents and metal coordination centers were synthesized and employed in conjunction with co-catalyst bis(triphenylphosphoranylidene) ammonium chloride (PPNCl) for the terpolymerization of phthalic anhydride (PA), propylene oxide (PO), and lactide (LA) ester without the use of initiators. The catalytic activity of the porphyrin ligand is significantly influenced by its substituents and different metal centers. Under optimal conditions, catalyst TOMePP-CoCl exhibits the most outstanding reactivity among all catalysts. In particular, this terpolymerization is a one-pot self-switching polymerization catalyzed by the metalloporphyrin/PPNCl system. PA selectively undergoes ring-opening copolymerization with PO first, while LA remains inert until PA totally consumed. Through continuous feeding experiments, a multiblock copolymer with fine structure controllability was successfully synthesized, which has been verified by DOSY NMR analysis.
研究领域:
材料化学
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高分子科学
✓ 已验证
产品关联
DOI
高影响因子
FISH & SHELLFISH IMMUNOLOGY
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2023
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IF 4.7
Ju Li,Jinmei Zuo,Xiaoyan Lv,Jiahe Ma,Xiaohong Li,Simiao Fu,Jinsheng Sun
Tissue autotomy is a unique adaptive response to environmental stress, followed by regeneration process compensating for the loss of body parts. The crustaceans present remarkable activity of appendage autotomy and regeneration, however, the molecular mechanism is still unclear. In this study, the Eriocheir sinensis Hedgehog ( EsHH ) and Smoothened ( EsSMO ) were identified in the regenerative limbs, and the function of Hedgehog signaling pathway on limb regeneration was evaluated. At the blastema growth stage of limb regeneration, the expression of EsHH and EsSMO was up-regulated in response to limb autotomy stress, and down-regulated at blastema differentiation stage. To clarify the effect of Hedgehog pathway during limb regeneration, the regenerative efficiency was evaluated with Smoothened inhibitor cyclopamine or RNAi ( ds-HH ) injection. We observed that the regenerative efficiency was significantly repressed with blockage of Hedgehog pathway at both the basal growth stage and the proecdysial growth stage, which was indicated by the delay of wound healing and blastema growth, as well as a decrease in the size of newly formed limbs. In addition, gene expression and BrdU incorporation assay showed that the proliferation and myogenic differentiation of blastema cells were suppressed with either cyclopamine or ds- HH injection. Thus, these results suggest that Hedgehog signaling pathway is essential for the establishment of limb regeneration in E. sinensis through promoting the proliferation and myogenic differentiation of blastema cells.
研究领域:
发育生物学
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分子生物学
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再生医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
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2025
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IF 26.8
Jinru Liu,Xiuyan Yan,Wei Wu,Bolin Ji,Yi Zhong,Linping Zhang,Bijia Wang,Xueling Feng,Hong Xu,Zhiping Mao
Passive radiative cooling offers zero-energy heat dissipation, yet static photonic structures fail in multi-scenario applications due to distinct or even incompatible requirements of infrared emission spectra across different thermal environments. Herein, a self-switching dynamic infrared radiative cooler (DIRC) is proposed that achieves triple-mode temperature regulation, including sub-ambient, near-ambient, and above-ambient cooling application. By leveraging temperature-triggered directional migration of broadband emission water molecules within thermoresponsive hydrogel, the spectral conversion between infrared selective emission for sub-ambient cooling and broadband emission for above-ambient cooling is realized. The resulting DIRC exhibits an average broadband emissivity of 94.1% across 2.5–25 µm and adaptively switches to a selective emissivity of 81.6% within the 8–13 µm, solar reflectivity maintains ≈90% during spectral conversion. The spectral transition is rapid and autonomous, with response times between 85.6 and 37.3 s across 35–45 °C temperature range. Notably, triple-mode thermal-regulated DIRC achieves a sub-ambient cooling of 9.5 °C for building thermal management, near-ambient cooling of 7.0 °C for enhanced personal comfort, and above-ambient cooling of 6.9 °C for photovoltaic panels. By overcoming the single-scenario and weather conditions limitations of static designs, the proposed DIRC represents a versatile strategy for triple-mode thermal regulation across a wide applications.
研究领域:
材料科学
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热物理学
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能源工程
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建筑节能
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光伏技术
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纳米光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
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2014
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IF 6.451
Lu Lu,Jing Cao Si,Zhong Feng Gao,Yu Zhang,Jing Lei Lei,Hong Qun Luo,Nian Bing Li
A dual strategy that combines the adenosine triphosphate (ATP)-dependent enzymatic ligation reaction with self-cleaving DNAzyme-amplified electrochemical detection is employed to construct the biosensor. In this design, the methylene blue-labeled hairpin-structured DNA was self-assembled onto a gold electrode surface to prepare the modified electrode through the interaction of Au–S bond. In the procedure of ATP-dependent ligation reaction, when the specific cofactor ATP was added, the two split oligonucleotide fragments of 8-17 DNAzyme were linked by T4 DNA ligase and then released to hybridize with the labeled hairpin-structured DNA substrate. The linked 8-17 DNAzyme catalyzes the cleavage of the hairpin-structured substrate by the addition of Zn 2+ , causing the methylene blue which contains high electrochemical activity to leave the surface of the gold electrode, therefore generating a dramatic decrease of electrochemical signal. The decrease of peak current was readily measured by square wave voltammetry and a relatively low detection limit (0.05 nM) was obtained with a linear response range from 0.1 to 1000 nM. By taking advantage of the highly specific cofactor dependence of the DNA ligation reaction, the proposed ligation-induced DNAzyme cascades demonstrate ultrahigh selectivity toward the target cofactor ATP. A catalytic and molecular beacons strategy is further adopted to amplify the electrochemical signal detection achieved by cycling and regenerating the 8-17 DNAzyme to realize enzymatic multiple turnover, thus one DNAzyme can catalyze the cleavage of several hairpin-structured substrates, which improves the sensitivity of the newly designed electrochemical sensing system.
研究领域:
生物化学
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电化学
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生物传感器
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纳米技术
✓ 已验证
DOI
PubMed
高影响因子
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