MOLECULES
·
2025
·Vol. 30
·期 20
·4101
·
IF 4.6
Chengbo Ru,Yanchun Zhang,Aoyang Yu,Lihong Chen,Hongxing Wang,Hongguo Zhang,Yiming Shan,Yi Jin
Nanothermites are widely applied as specific power sources for microscale initiators and pyrotechnics. Increasing the charge density enhances energy storage within a confined combustion chamber, but it also alters the reaction kinetics. To systemically explore this phenomenon, the combustion and pressurization characteristics of electrosprayed nanothermite-based hybrid energetic materials (THEMs) with different metallic oxides (Fe2O3, CuO, and Bi2O3) and various energetic additives (nitrocellulose (NC), octogen (HMX), ammonium perchlorate (AP), and hexanitrohexaazaisowurtzitane (CL-20)) across various loading densities were tested. The results showed that increasing the loading density decreased the porosity of the loaded nanothermites and then rapidly decreased the convective heat transfer efficiency during the combustion propagation process. When the loading density exceeded a critical value, a dramatic decrease in the peak pressure, several orders-of-magnitude decrease in the pressurization rate, and an order-of-magnitude increase in the combustion duration occurred. Due to the dual effects of the porous microstructure on heat and mass transfer, the critical density of both the electrosprayed Al/CuO/NC/CL-20 composites and their physically mixed counterparts is between 37.9 and 43.9% theoretical maximum density (TMD). Because of the different synergistic catalytic effects, the fast reactivity at the high-loading-density maintaining capacity of the applied additives was AP > HMX ≈ CL-20 > NC. Owing to their intrinsic properties of low ignition temperature and high gas yield, the Bi2O3-THEMs could maintain high-speed reactivity even at 59.7% TMD. These results provide valuable insights into the rational design and tailoring of the reactivity of nanothermites for specific applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Bohan Zheng,Guangxu Yin,Shuang Yang,Lvping Fu,Meijie Zhang,Ao Huang,Huazhi Gu
Typically, advanced solar absorber coatings containing chromium (Cr) achieve high solar absorption efficiencies. However, large-scale applications raise concerns regarding the safety and cost due to the potential toxicity of Cr. This study develops a Cr-free (Fe x Co 0.25 Mn 0.25 Cu 0.25 ) 3 O 4 spinel coating based on tuning Fe content, which exhibits enhanced solar absorption and thermal stability. As Fe content increases, a single spinel structure is stabilized, accompanied by lattice expansion. Meanwhile, the covalent competition among cations at the tetrahedral sites in the structure is enhanced, facilitating the migration of Co and Mn ions from tetrahedral to octahedral sites. This process alters the valence distribution and lattice symmetry, leading to a reduction in oxygen vacancies (O V ) and an increase in the bandgap. Consequently, the solar absorptance was enhanced from 90.6 % to 93.2 % by decreasing Fe content in the single spinel structure, while infrared emissivity exhibits a significant increase in emissivity at 2.5–7.8 μm. After 60 thermal cycles at 750 °C, the (Fe 0.25 Co 0.25 Mn 0.25 Cu 0.25 ) 3 O 4 coating exhibits improved solar absorptance (94.9 %) and reduced thermal emissivity (90.2 %), ultimately enhancing the thermal efficiency to 89.3 %. This work provides a new option for Cr-free solar absorption coatings with tailored performance in high-temperature concentrated solar power (CSP) systems.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SYNCHROTRON RADIATION
·
2025
·Vol. 32
·期 6
·1569-1577
·
IF 3
Wang Y.,Tang K.,Liu S.,Ma C.,Zhao X.,Liu D.,Zhao Y.,Zheng L.
The Tender X-ray Beamline (TEX), using a bending magnet as a light source, is the first beamline of the High Energy Photon Source (HEPS) to undergo commissioning. It covers an energy range from 2.1 keV to 11 keV. Dynamic diagnostic tools have been installed and can measure the photon flux, energy resolution and position stability. By use of these tools, TEX was found to achieve a photon flux of up to 9 × 1011 photons s−1, with an energy resolution of 5904 @ 3203.6 eV and position stability lower than ±3 µm (horizontal) × 15 µm (vertical). In this paper, the diagnostic process of the beamline and its performance will be introduced in detail.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Qiannan Huang,Pengping Li,Yu Wei,Xinxing Zhang,Mingfeng Zhong,Pingan Liu,Hui Wang,Zhijie Zhang
Multilayer piezoelectric ceramics employing base metals such as copper as inner electrodes are ideal for components like micro-displacement actuators and ultrasonic motors, which require materials possessing high piezoelectric performance, high Curie temperature, and low sintering temperature. In this study, by introducing a ternary composite additive of Li₂CO₃-CuO-Nb₂O₅ into the 0.075Pb(Mn 1/3 Sb 2/3 )O 3 -0.925Pb(Zr 0.48 Ti 0.52 )O 3 (PMS-PZT) system, PMS–PZT ceramics with excellent overall properties were successfully fabricated at a sintering temperature of 950 °C, exhibiting d 33 = 361.2 pC/N, Tc= 339.8 ℃, tanδ= 0.6%, Q m = 668.8, k p = 0.65. The effects of sintering temperature on the structure and properties of the ceramics were systematically investigated. The synergistic action of Li 2 CO 3 and CuO effectively reduced the sintering temperature and facilitated the incorporation of Nb into the B-site at relatively low temperatures, thereby significantly enhancing the piezoelectric performance and Curie temperature of the material. This work not only provides an effective low‑temperature sintering approach for the PMS–PZT ceramic system, but also offers important references for the selection of material systems and additives in the development of multilayer piezoelectric devices.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2026
·
IF 5.2
Hui Liu,Shiyun Chen,Wei Wang,Jian Bian,Antai Chen
The breathing pyrochlore oxide LiInCr 4 O 8 exhibits coupled structural, magnetic, and dielectric functionalities, which motivates interest in multifunctional ceramic applications. Cu-substituted compositions, LiInCr 4- x Cu x O 8 ( x = 0, 0.2, 0.4, 0.5), were synthesized using a solid-state reaction route. In contrast to conventional polycrystalline methods, phase formation was achieved at a lower temperature of 1050°C and within a shorter duration of 24 h. X-ray diffraction confirmed single-phase formation when x ≤0.4 and existence of an impurity phase (In 2 O 3 ) at x = 0.5. Cu incorporation decreases lattice parameters from 8.4125(2) Å to 8.3823(6) Å and increases the breathing factor ( B f ) from 0.1 to 0.1017, attributable to oxygen vacancies and Jahn–Teller distortion. Scanning electron microscopy revealed reduced grain size (∼2 μm) due to lattice strain and suppressed growth. Magnetization measurements showed decreased negative Curie–Weiss temperature and effective magnetic moment. The magnetism indicates a weakened spin gap and emergence of cluster glass behavior, arising from competition between Cr–Cu ferromagnetic interactions and antiferromagnetic order. Detailed studies of dielectric and impedance properties, conducted over a frequency range of 20–3×10 7 Hz and temperature range of 30–350 o C, revealing some interesting behaviors. Dielectric spectroscopy showed an enhanced dielectric constant with frequency-dependent losses: reduced loss at ≤ 5 kHz and increased loss at > 5 kHz, governed by grain boundary contributions at low frequencies, bulk grain effects at high frequencies, and additional oxygen-vacancy-related losses. Impedance increased systematically with Cu substitution up to x = 0.4, followed by a reduction at x = 0.5, reflecting increased grain boundary density and carrier concentration. A low dielectric loss (∼0.01) at high frequencies underscores the potential of Cu-substituted LiInCr 4 O 8 ceramics for microelectronic applications.
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2026
·
IF 6
Bowen Hua,Shuai Han,Bin Liu,Feng Liu
Polymer-based composites typically suffer from a trade-off between thermal expansion and thermal conductivity due to the lack of continuous functional pathways. Herein, we propose a topological design strategy where Cu₂P₂O₇ is transformed from a passive filler into an active, tunable negative thermal expansion (NTE) skeleton to resolve this conflict. The scientific core of this work lies in regulating the sintering-mediated evolution of the porous skeleton to tailor the structure-property relationships. By precisely controlling sintering temperatures (1073 K–1373 K), we modulated the skeletal pore topology from a "particle-edge fusion" state to a highly densified network. This continuous NTE framework exerts a strong elastic constraint on the epoxy matrix, effectively suppressing its anharmonic vibration-induced expansion, while simultaneously eliminating phonon scattering at resin-particle interfaces to minimize interfacial thermal resistance. Consequently, the optimized CPO-1073/epoxy composite achieves a rare combination of near-zero thermal expansion (0.85 ppm K⁻¹) over a wide window (240–340 K) and high thermal conductivity (2.3 W m⁻¹ K⁻¹, seven times that of pure epoxy). Ideally, the low-temperature sintered skeleton preserves a high specific surface area for mechanical interlocking, ensuring robust structural integrity (∼80 MPa) unlike the brittle failure seen in dense ceramic networks. This work elucidates how preform-based microstructure engineering can independently tune thermal and mechanical functionalities, offering a generalizable principle for advanced composite design.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Shan Tang,Jiumei He,Chengcheng Wan,Li Jiang,Qianchun Zhang
This study addresses the urgent demand for simple and sensitive online gas monitoring technologies in the field of environmental safety by developing a high-performance cataluminescence (CTL) sensor based on oxygen-vacancy-rich microporous titanium dioxide (Ovm-TiO 2 ) for detecting trace isobutyraldehyde (IBL). The Ovm-TiO 2 material, synthesized via a two-step heating process combined with a KBH 4 treatment, features abundant oxygen vacancy defects on its surface, which are pivotal to enhancing sensor performance. Density functional theory (DFT) calculations unravel the surface-mediated mechanism, the oxygen vacancies serve as active sites, drastically enhancing the chemical adsorption and activation of O 2 on the Ovm-TiO 2 surface, which is the key to boosting the cataluminescence efficiency. The developed sensor exhibits outstanding detection performance for IBL, with a wide linear range (0.0100–5.00 mg/L, R 2 = 0.9997), a low detection limit (3 μg/L), and achieved recovery rates of 87.6%–107% with good reproducibility (relative standard deviation, RSD: 5.3%–9.0%) in practical sample analysis. This work not only provides a viable online monitoring solution for IBL but also elucidates the CTL enhancement mechanism at the atomic level, offering important theoretical foundations and practical insights for designing highly sensitive gas sensors.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Pengfei Wang,Jintang Chen,Zhijiang Zhou,Shuai Tong,Tao Wang,Junjie Xiong,Xilei Zhou,Min Jia,Xiaoyu Zhang
Sodium-ion batteries (SIBs) are now viewed as a prospective energy storage system for grid applications. As one of the representative cathode materials, Ni-Fe-Mn-based ternary layered oxides (NFM) have attracted extensive attention due to the extensive commercialization practices. However, the modification of NFM with multiple dopants, especially using the high-entropy structures, usually results in residual impurity phases, which could lead to an obstacle to the production consistency during commercialization. This can be ascribed to the Gibbs free energy with the correlated formation energy of the system with complex and diverse elements. To address this challenge, herein, a pure phase O3-type Na 0.95 Li 0.06 Ni 0.2 Cu 0.1 Fe 0.12 Al 0.03 Mn 0.39 Ti 0.1 O 2 (denoted as NFMLCTA) is successfully synthesized via a high-entropy strategy with the assistance of ‘high-entropy agent’ Al element. Theoretical studies discloses that the existence of Al with certain threshold can effectively promote the formation of a pure phase by reducing in formation energy. The synergistic effect of multiple dopants is also unveiled systematically. Electrochemical performance tests show that NFMLCTA delivers a reversible capacity of 178.02 mAh g −1 at 0.1C within the voltage range of 2.0–4.2 V. At a high rate of 20C, it maintains a capacity of 72.29 mAh g −1 with a capacity retention of 80.6% after 500 cycles. Structure evolution study using in-situ X-ray diffraction (XRD) as the implementation discloses that high-entropy doping could markedly restrain the detrimental P3 → O3’ phase transition at high-voltages with the formation of OP2 phase at the end of charging, which contributes to the cycling stability. This study offers a novel insight for designing pure phase high-entropy SIBs cathodes and opens an innovative avenue for promoting the advancement of high-performance SIBs.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Chong Wan,Suhang Chen,Li Ding,Qingguang Zhu,Qilong Yan,Fengqi Zhao,Kangzhen Xu
To address the challenges of nano-active component agglomeration and incomplete energy release of boron/copper oxide metastable intermixed composites (B/CuO MICs). In this work, the energetic polyvinyl pyrrolidone- nitrocellulose- cyano modified graphitic carbon nitride semi-interpenetrating-polymer-networks (PVP-NC-g-C 3 N 4 -CN sIPNs) were constructed and utilized as substrate to fabricate high energy B/CuO MICs, in which the nanoparticles can evenly disperse on the constructed sIPNs via various covalent and non-covalent interaction due to strong polar of cyano group. The constructed sIPNs can maximize the interface contact area between nano-sized B and CuO particles, and supply more active sites for exothermic redox reaction. Meanwhile, the generated gases will blow away the formed molten B 2 O 3 and other impurities, thereby facilitating interface contact between active B core and oxygen. Thus, the B/CuO shows the highest combustion heat value (10743.8 ± 191.7 J·g −1 ) when the contents of PVP, NC and g-C 3 N 4 -CN-2 are 1.25 wt%, 5.0 wt% and 5.0 wt%, respectively, and the calculated B combustion efficiency greatly increase from 25.9% to 99.6%. Besides, the thermal stability, microwave ignition delay times, burn rate, maximum pressure and pressurization rate values were also evaluated and compared with the effect of PVP-NC and PVP-NC-g-C 3 N 4 on B/CuO. This work will improve the application of B-based MICs in the fields of military and civilian.
✓ 已验证
产品关联
DOI
高影响因子
MICROELECTRONICS RELIABILITY
·
2026
·
IF 2.5
Tao Yang,Guoyou Gan,Xianglei Yu,Hu Sun,Junpeng Li
This study investigates the electrical properties and stability of resistor pastes formulated from RuO 2 –CuO composites doped with La 2 O 3 . The pastes exhibit an approximately linear positive temperature coefficient (PTC) of resistance behavior, referred to as near-linear positive temperature coefficient of resistance (TCR) in this work, to emphasize the linearity of the resistance-temperature relationship, with optimal performance achieved at 1.2 wt% La 2 O 3 doping. Microstructural analyses indicate that La 2 O 3 promotes densification of the resistive layer, enhancing the stability of the conductive network. After 1000 h of storage at room temperature, the resistance change rate is approximately 0.5%. Under high-temperature conditions (150 °C for 240 h), the rate increases slightly to about 2%, demonstrating satisfactory preliminary stability.
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2026
·
IF 18.1
Xu Shao-Wen,Liu Wei,Zhu Xu,Hong Zhuozheng,Qian Lisheng,Cheng Chen,Chen Kai,Zhang Liang,Ma Chuansheng,Liu Mengting,Shi Le,Xiao Yao,Dou Shi-Xue,Cheng Yonghong,Wang Peng-Fei
Fast-charging capabilities of sodium-ion batteries have emerged as a pivotal objective within the energy storage fields. Sodium layered P2-type oxide positive electrodes are considered promising for fast charging due to their inherent fast Na + mobility. However, their electrochemical polarization and interfacial charge transfer especially at high state of charge are limiting factors in quick kinetic response for large current. Herein, we demonstrate that a typical P2-type positive electrode (Na 0.7 Ni 0.27 Mn 0.53 Cu 0.04 Fe 0.08 Ti 0.08 O 2 ) achieves high-rate capacities through avoiding octahedral stacking faults, maintaining lattice oxygen activity and controlling anion-specific adsorption. The intermediate Z-phase intergrowth structure mitigates kinetic polarization and thermodynamic hysteresis by simultaneously suppressing the unfavorable phase evolution from P2-type to O2-type and irreversible oxygen redox. The potential-dependent competitive adsorption mechanism between anions and solvent molecules is revealed within the inner Helmholtz plane, where optimized anion-specific adsorption elevates potential difference between electrodes and inner Helmholtz plane, accelerating charge transfer across the electrode/electrolyte interface. Furthermore, the F-rich cathode/electrolyte interphase generated from inner Helmholtz plane mitigates transition metal dissolution and surface lattice collapse for stable long-term cycling. This study highlights the synergistic coupling interaction between bulk phase stability and interfacial environment optimization in ensuring fast Na + /charge transport kinetics for sodium-ion batteries.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Yunlong Hu,Sanqi Yang,Wenyan Zhong,Zhiguo Wang,Zhenggang Rao,Longlong Shu,Chunchun Li
Two garnet-type microwave dielectric ceramics, Ca 3 M 2 GeV 2 O 12 (M = Zn, Cu), were successfully synthesized via the conventional solid-state reaction method. Their sintering behavior, microstructural characteristics, and microwave dielectric properties were systematically investigated. Phase purity was confirmed through XRD pattern analysis and Rietveld refinement, which indicated single-phase formation for both compositions. Scanning electron microscopy (SEM) observations revealed that both samples achieved dense microstructures with relative densities >96% at their respective optimal sintering temperatures. The Ca 3 Zn 2 GeV 2 O 12 ceramic sintered at 1120 °C exhibited excellent microwave dielectric properties with a relative permittivity ( ε r ) of 11.66 ± 0.2, a quality factor ( Q × f ) of 61,849 ± 500 GHz, and a temperature coefficient of resonant frequency (τ f ) of −73.41 ± 0.7 ppm/°C. In comparison, the Ca 3 Cu 2 GeV 2 O 12 ceramic demonstrated a significantly lower sintering temperature of 930 °C and inferior dielectric properties, yielding ε r = 10.4 ± 0.2, Q × f = 13,057 ± 500 GHz, and τ f = −89.2 ± 0.7 ppm/°C. Furthermore, Ca 3 Cu 2 GeV 2 O 12 showed good chemical compatibility with silver electrodes, indicating its potential as a promising candidate material for low-temperature co-fired ceramic (LTCC) applications.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）