Energies
·
2024
·Vol. 17
·期 2
·474
·
IF 3
Xiao Yang,Yuqi Ji,Haoyan Zhang,Bin Liu
Tetrabutylammonium bromide (TBAB) is considered a promising alternative cold energy storage material. Due to the high dissociation heat of phase transition at an atmospheric pressure of 278–293 K, which reaches 200–500 kJ/kg, this substance is considered an effective cold energy storage medium for air conditioning systems. In this paper, the cold storage crystallization process of TBAB solution with different concentrations was tested by conducting experiments and the phase transition’s temperature and latent heat were measured. Finally, the growth characteristics of TBAB hydrate crystals with different concentrations (10%, 20%, 30% and 40%) were analyzed. Considering the cold storage temperature, phase transformation temperature and latent heat, the cold storage effect is the best when 40% TBAB solution is used. Although single substance phase change materials have a long service life, they have problems with low thermal conductivity and high undercooling. Therefore, researchers usually improve the performance of phase change materials by adding other auxiliary materials, thereby enhancing their application prospects. Among these auxiliary materials, adding nano additives to phase change materials can significantly improve latent heat, thermal conductivity and nucleation ability, while also reducing undercooling. Therefore, we studied the influence of different nano-additives (Al2O3, SiC, TiO2and ZnO) on phase change materials. The composites with excellent properties were screened by cooling step cooling curve and differential scanning calorimeter (DSC). Compared with pure TBAB solution, the phase transition latent heat of the composite phase change materials (PCMs) prepared by adding nanoparticles were significantly increased. The results show that adding nano-SiC into 40% TBAB solution can obtain better performance. This work not only provides reference for the further research, but also a sight to design the phase change materials for the application of new phase change cold storage materials.
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高影响因子
CARBON
·
2025
·
IF 11.6
Hongsheng Liang,Tian Hou,Tiancheng Liu,Shengchong Hui,Zhaoyang Hou,Zhen Wang,Bin Shi,Limin Zhang,Hao Shen,Hongjing Wu
Comprehensively understanding the role of interfacial engineering in tailoring dielectric response is essential for the development of next-generation electromagnetic wave (EMW) absorbers. Rare-earth oxides, with their flexible valence states and localized 4f orbitals, hold great potential to mediate interfacial charge transfer and polarization, yet the electromagnetic loss mechanisms underlying such effects remain unclear. Here, we demonstrate a rare-earth oxide–regulated interfacial engineering strategy, where the incorporation of CeO 2 into NiCo 2 O 4 constructs abundant heterointerfaces with dynamic valence states. Such CeO 2 -induced interfacial polarization markedly strengthens dielectric response and facilitates impedance matching, thereby surpassing the limitations of single-phase components. Dielectric analysis reveals that polarization loss dominates (>88 %) within the absorption band, while conduction loss plays a secondary role. The results show that interfacial charge redistribution driven by Ce 3+ /Ce 4+ redox flexibility, which creates abundant interfacial polarization centers and enhances relaxation. As a result, the optimized NiCo 2 O 4 /CeO 2 –T3 delivers outstanding EMW absorption, achieving a broad effective absorption bandwidth of 6.37 GHz at 2.00 mm and reflection loss of −60.09 dB at 2.20 mm (>99.99 % attenuation). This study establishes rare-earth oxide–enabled interfacial engineering as a powerful paradigm for amplifying interfacial polarization and guides the rational design of high-performance, lightweight EMW absorbers.
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CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Zhuxuan Lin,Ying Qian,Zequn Li,Han Zhang,Guangyao Li,Song Li,Meiling Chen,Jeonghun Kim,Wenkai Zhu
Formaldehyde as a common indoor volatile organic compound (VOC) poses serious health risks to humans. Therefore, developing efficient formaldehyde adsorbents is essential for improving indoor air quality. Recently, zeolitic imidazolate framework (ZIF)-based adsorbents have attracted significant attention due to their high efficiency in formaldehyde removal. In this work, cellulose nanofiber (CNF) was used as biomass templates to in situ grow ZIF-8, forming a ZIF-8@CNF filter with enhanced adsorption capacity. The physical–chemical properties of ZIF-8@CNF were investigated using SEM, XRD, FTIR and XPS. The results demonstrate that the successful self-assembly of ZIF-8 crystals onto CNF results in a ZIF-8@CNF filter with a high specific surface area and abundant pore structures. Meanwhile, the ZIF-8@CNF filter demonstrated remarkable formaldehyde adsorption capacity, and achieved 88.32% removal of formaldehyde within 6 h. Additionally, the filter maintains stable structural integrity while retaining over 70% of the formaldehyde adsorption capacity after undergoing five adsorption–desorption cycles, demonstrating outstanding reusability. Furthermore, the adsorption of formaldehyde by the ZIF-8@CNF filter relies on its internal layered porous structure and noncovalent interactions with formaldehyde molecules. Therefore, the as-prepared ZIF-8@CNF filter offers an effective solution for indoor formaldehyde removal.
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高影响因子
Advanced Industrial and Engineering Polymer Research
·
2026
·
IF 18.4
Feng Yang,Jiye Jia,Yingang Xiao,Pei Feng,Cijun Shuai
Mechanism by which process parameters affect the shape memory properties of 4D-printed objects remains unclear. In this study, laser powder bed fusion (LPBF) was employed as the printing technique to systematically investigate the relationship from poly(L-lactic acid) (PLLA) raw material preparation to process-properties mapping. It was found that increasing the laser energy density led to a lower shape recovery ratio of PLLA scaffold with a lower crystallization, wherein the crystalline phase acted as netpoints remembering the permanent shape. And the phenomenon that crystalline phases were breaking down into fewer and smaller crystalline phases under a high laser energy density was intuitively observed. The mechanism was proposed that the laser broke the crystalline phase of PLLA powder during printing and enabling control over the netpoints and thereby influencing the shape memory properties of PLLA scaffold. Furthermore, based on the above mechanism, multi-phase composite scaffolds with pixel-level distribution of amorphous and semi-crystalline phases were fabricated using a single semi-crystalline PLLA as the raw material by tailoring LPBF process parameters. In conclusion, this study revealed that laser-induced breaking of PLLA crystalline phase governed the shape memory properties and provided a new paradigm for multi- phase printing via LPBF.
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ACS Sustainable Chemistry & Engineering
·
2026
·Vol. 14
·期 30
·13689-13698
·
IF 7.6
Xu Yanling,Zhou Yue-Wen,Cai Zhen-Feng,Liu Qinlei
Imines are valuable intermediates and building blocks in fine chemicals and pharmaceutical synthesis. Oxidative coupling of amines represents an attractive route to imine formation. However, conventional methods rely on metal catalysts, external oxidants, or thermal and photochemical activation, involving multistep processes, harsh conditions, and environmental concerns. Here, we report that amines undergo oxidative coupling to imines within aqueous microdroplets at room temperature, without any catalyst or oxidant. The molecular structures of products were confirmed by mass spectrometry, UV–vis spectroscopy, and 1 H NMR analysis. Substrate scope studies revealed that the microdroplet system enables both self-coupling and cross-coupling of amines, highlighting its broad generality. Radical trapping experiments and density functional theory calculations suggest reactive oxygen species, including hydroxyl radicals and hydrogen peroxide, are likely involved in the oxidative process occurring at the microdroplet interface. This work introduces a simple, rapid, and environmentally benign strategy for imine synthesis and underscores the unique potential of microdroplet chemistry in advancing green oxidative coupling reactions.
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CARBON
·
2026
·
IF 12.7
Hanjun Wei,Zhiyong Chen,Yuxiang Lai,Siyu Chen,Lianyang Chen,Jimei Xue,Zhijun Wang,Ying Li
The rapid development of artificial intelligence and next-generation high-frequency communication technologies has increased the demand for electromagnetic (EM) wave-absorbing materials capable of operating under complex environments while maintaining multiple functionalities. In this work, hierarchically porous carbon was prepared using Ganoderma as a natural precursor through carbonization, activation, and heat treatment. The obtained carbon framework inherits the intrinsic biological channels of the Ganoderma scaffold, forming an interconnected porous structure composed of longitudinal macropores and abundant meso/micropores. The optimized GA-800 (heat-treated at 800 °C) sample exhibits efficient microwave absorption performance at a filler loading of 20 wt%, with a minimum reflection loss (RL min ) of −39.6 dB at a thickness of 1.55 mm and a maximum effective absorption bandwidth (EAB) of 5.7 GHz at 1.50 mm. Radar cross-section (RCS) simulations further demonstrate significant scattering suppression. In addition to microwave attenuation, the hierarchically porous carbon also displays hydrophobic behavior (contact angle of 127.5°), thermal insulation capability, and a stable photothermal response. These multifunctional properties originate from the biologically inherited hierarchical porous architecture, which simultaneously regulates EM wave propagation, thermal transport, and surface hydrophobic behavior. This study demonstrates that natural biomass structures can serve as effective templates for constructing lightweight multifunctional EM materials. Download: Download high-res image (346KB) Download: Download full-size image
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ADVANCED MATERIALS
·
2026
·
IF 29.1
Lvtong Duan,Jinkai Jia,Junchen Liu,Yijie Liu,Weimeng Chu,Jintang Zhou,Jiaqi Tao,Yi Yan,Weize Wang,Zhenyu Cheng,Yucheng Wang,Wenjian Zheng,Haiyan Zhuang,Tianjing Huang,Zhengjun Yao
The rapid growth of electronic devices has intensified electromagnetic wave pollution. Electromagnetic wave absorption (EWA) materials provide a green solution by converting electromagnetic energy into thermal energy. Achieving high-performance EWA requires a fine balance between impedance matching and energy dissipation, demanding precise control of microstructure, interfaces, and electronic states of the materials. However, complex multiscale structures involve strongly coupled structural evolution, which reduces controllability and hinders clear structure–performance correlation. Here, a cobalt-based metal–organic framework (Co-MOF) is employed as the precursor. By regulating the contents of Ni 2 + and Fe 3 + , the structural evolution and the modulation of localized electronic states during the etching process are systematically elucidated. In addition, the in situ competitive coordination and etching-competitive coordination systems reveal the mechanistic differences between atomic-scale induced reconstruction and directional destructive reconstruction. Benefiting from synergistic regulation spanning atomic, nanoscale, and microscale levels, the obtained FeNi/C composite achieves an effective absorption bandwidth of 7.13 GHz at an ultrathin thickness of 1.97 mm. Combining DFT, COMSOL, and CST simulations, the role of etching engineering in enhancing EWA performance is elucidated from electronic, local-field, and macroscopic perspectives, providing a theoretical basis for its controllable application and the rational design of high-performance absorbers.
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PubMed
高影响因子
MATERIALS CHARACTERIZATION
·
2026
·
IF 6.2
Ehsan Ghasali,Hamidreza Ghadami Karder,Congya Zhu,Ayesha Sadiqa,Li Jie,Yasin Orooji
Novel Dy₂Ho₂Er₂Tm₂Yb₂O₁₅ high-entropy oxide successfully synthesized via conventional sintering. • Single-phase cubic bixbyite structure (Ia-3) formed across all sintering conditions. • Higher sintering time/temperature promoted grain growth, strain relaxation and homogeneity. • Bandgap narrowed to 4.45 eV due to high-entropy induced lattice distortion. characters). • Promising photoluminescence properties indicating potential photocatalytic activity. A bixbyite-structured rare-earth high-entropy oxide with the composition Yb₂Tm₂Er₂Dy₂Ho₂O₁₅ was synthesized by a conventional compaction–sintering route. The effects of sintering temperature and time on phase formation, microstructure, chemical homogeneity, and optical properties were systematically investigated. XRD confirmed the formation of a cubic bixbyite structure with the space group , while Williamson–Hall analysis indicated improved crystallinity and strain relaxation with increasing sintering severity. SEM/TEM observations and EDS mapping revealed progressive grain growth, densification, and homogeneous distribution of the constituent rare-earth elements. XPS results confirmed the predominance of trivalent rare-earth cations and a stable oxygen environment, with no major chemical-state changes after sintering. UV–Vis analysis showed a band gap of 4.45 eV, which is lower than those of the individual constituent oxides, suggesting that lattice distortion and compositional complexity influence the electronic structure. PL results further indicated reduced electron–hole recombination in the UV region. Overall, the results demonstrate that conventional compaction and sintering can produce chemically homogeneous bixbyite-type rare-earth HEOs with tunable microstructural and optical characteristics.
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Materials
·
2026
·Vol. 19
·期 14
·2977
·
IF 3.7
Anjie Qi,Yunjia Liang,Bingjie Ge,Guodong Jiang,Shanglin Xiang,Dongyu Cai
HighlightsDeveloped a self-catalytic water/castor oil system for PET depolymerization.Achieved spontaneous precipitation of oligoesters without cooling crystallization.Upcycled the oligoesters into polyurethane adhesives with high peel strength.This study presents a green approach for polyethylene terephthalate (PET) upcycling using a biphasic system of subcritical water and castor oil. This system enables efficient conversion without an external catalyst and facilitates product separation. Hydrolysis of castor oil generates fatty acids in situ, which catalyze PET conversion to selectively produce low-molecular-weight oligoesters (Mn ≈ 1500 g/mol). These oligoesters are inherently immiscible with the bio-medium at room temperature, allowing straightforward separation by centrifugation. Orthogonal experiments show that temperature is the dominant factor affecting PET conversion, with the optimal conditions being 200 °C, a water-to-oil mass ratio of 1:5, and a reaction time of 10 h for complete conversion. Under the practical optimum condition, the castor oil phase remained highly effective over five consecutive depolymerization cycles. The functionalized oligoesters were used in polyurethane synthesis. At 6% loading, they gave adhesives with a T-peel strength of 8.09 N/15 mm and tensile strength of 25.14 MPa, and excellent damp-heat stability (only 0.62% loss in T-peel and 0.47% in 180° peel after aging). Thermogravimetric analysis confirmed enhanced thermal stability, with increases of 19.52 °C in T5%and 16.50 °C in T50%compared with the unmodified system. These results demonstrate the practical potential of the obtained oligoesters in high value adhesive applications.
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PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2026
·
IF 3.8
Xiao Cheng,Hao Zhang,Zixu Chen,Haozhuo Dong,Ting Yu,Ruifang Guan
Room-temperature phosphorescent carbon dots (RTP-CDs) exhibit exceptional biocompatibility and tunable luminescence but are limited by short lifetimes and exciton quenching. Herein, we develop a one-step pyrolysis strategy using m-phenylenediamine and boric acid to fabricate boron-doped RTP-CDs (M-CDs) with ultralong green afterglow (16 s) and extended lifetime (37.03 ms). The rigid polycrystalline boron oxide matrix effectively confines molecular motion, isolates quenchers, and stabilizes triplet excitons, while boron doping reduces the singlet-triplet energy gap (ΔE ST = 0.206 eV) to promote intersystem crossing (ISC). Further heavy-atom doping (Cl/Br) enhances spin-orbit coupling, boosting afterglow to 18 s and lifetime to 41.16 ms, whereas iodine disrupts the matrix. Leveraging tunable afterglow dynamics, we demonstrate dynamic information encryption with visible/UV-switchable patterns. This work provides a cost-effective route to high-performance RTP-CDs and clarifies synergistic regulation mechanisms for advanced optoelectronic applications.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 7
·e70972
·
IF 4.2
Ding-shun She,Shao-rong Bie,Yantao Gong
Laser ablation of diamond involves coupled thermal and chemical processes sensitive to intrinsic defects and ambient environments. Here, the color-dependent ablation behavior of diamonds is systematically investigated under nitrogen, air, and oxygen atmospheres. Ablation efficiency increases from colorless to black diamonds, attributed to enhanced laser absorption and localized thermal accumulation induced by higher defect densities. Meanwhile, atmospheric conditions regulate carbon transformation pathways. Raman results show a decrease in the ID/IG ratio from nitrogen to oxygen, indicating suppressed accumulation of disordered sp 2 carbon in oxidative environments. In contrast, XPS reveals increased C═C bonding and oxygen-containing functional groups with higher oxygen content. This discrepancy arises because Raman and XPS probe structural disorder and chemical composition, respectively. A competitive mechanism is proposed, where graphitization dominates in inert atmospheres, while oxidation removes unstable carbon and promotes surface reconstruction in oxygen-rich environments.
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Journal of Environmental Chemical Engineering
·
2026
·
IF 7.5
Yang Li,Yaling Zeng,Zhendong Ouyang,Yunxiao Wen,Jian Yang,Ximei Fan
The complete mineralization of aromatic VOCs via photocatalysis remains a grand challenge, limited by severe photogenerated carrier recombination and the easy formation of toxic refractory phenolic intermediates. Here, we demonstrate a solvent-mediated crystal facet engineering strategy to construct a Bi 2 WO 6 -BiOCl S-scheme heterojunction with oriented exposure of high-activity facets and abundant surface hydroxyl sites. The facet-tailored heterojunction achieves efficient spatial separation of photogenerated carriers via a strong built-in electric field, while retaining the strong redox capacity to generate abundant reactive oxygen species. The optimal catalyst delivers over 95% gaseous toluene removal and 94.9% mineralization efficiency within 1 h irradiation, with 99.7% of removed toluene converted to CO 2 , exceeding the aqueous-synthesized control, pure-phase counterparts, and most reported bismuth-based photocatalysts. In-situ diffuse reflectance infrared Fourier transform spectroscopy combined with theoretical calculations reveals that facet-induced surface hydroxyl sites act as specific adsorption and activation centers for toluene molecules, steering the degradation toward a benign benzyl alcohol-benzaldehyde-benzoic acid pathway and inhibiting the generation of toxic phenolic byproducts. This work clarifies the critical role of crystal facet engineering in coordinating heterojunction charge transfer and surface reaction pathway modulation, providing a new avenue for designing high-performance photocatalysts for the complete mineralization of aromatic VOCs.
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高影响因子
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