JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2025
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IF 3.1
Yang Zhan-jun,Liu Hao,Das Oisik,Wang Xiao-qian,Li Mi,Han Zhong-xuan,Jiang Lin,Rotaru Andrei
This study contributes to advancing research in aluminium alloys employed as fuels for thermites (pyrotechnic compositions formed of metal and metal oxide powders). Aluminium alloys possess certain potential in regulating energy release and enhancing combustion efficiency; in order to explore better formulations for the aluminium alloy fuel thermite, PVDF-coated Al–Si samples with different proportions were prepared here by using the electrostatic spraying method. In this study, we are primarily addressing the energy release limitation problems which are imposed by the oxide layer formation during the combustion of aluminium–silicon alloy powders in air and explore the optimal formulation of aluminium–silicon fuel combined with fluoropolymer oxidants. Leveraging advanced electrostatic spraying technology, various PVDF (polyvinylidene fluoride)-coated Al–Si samples (Al–Si@PVDF) were successfully synthesized. Morphological characterization confirmed the complete encapsulation of Al–Si alloy powders by PVDF, yielding spherical core–shell structures with uniform elemental distribution and favourable microstructural characteristics. Further, by thermal analysis and calorimetry investigation, a two-stage reaction between Al–Si and PVDF was unveiled: an initial PVDF decomposition phase followed by an ignition reaction phase. To comprehensively evaluate the combustion performance of samples with varying proportions, high-speed and infrared cameras were employed for precise observations, enabling a deep dive into the combustion parameters and their disparities under two distinct spatial conditions. Through these combustion performance experiments and post-combustion product analysis, we deduced the micro-combustion process mechanism of Al–Si@PVDF. This works not only that it provides a scientific basis for optimizing the formulation of aluminium–silicon fuels and fluoropolymer oxidants, but also holds positive implications for advancing research and development in aluminium alloy-based metastable intermolecular composites. Last but not least, besides the high combustion rates, low ignition temperatures, stable combustion, and strong exothermic performance were obtained for these thermite composite materials.
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高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 38
·385705
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IF 2.9
Yongguang Xiao,Lisha Yang,Yong Jiang,Siwei Liu,Gang Li,Jun Ouyang,Minghua Tang
Lu doped Hf0.5Zr0.5O2 (HZO) ferroelectric films were prepared on Pt/TiN/SiO2/Si substrate by chemical solution deposition method, and an interfacial engineering strategy for improving the ferroelectric property was explored by capping the Lu doped HZO films with a cerium oxide layer. Compared with the Lu doped HZO film without the CeOx coating layer, the Lu doped HZO film with the CeOx coating layer has a larger remanent polarization (2Pr = 34.72 µC cm−2) and presents weaker wake-up behavior, which result from the higher orthogonal phase ratio and the lower oxygen vacancy of the CeOx coated Lu doped HZO film. In addition, the CeOx coating can remarkably improve the fatigue resistance and retention performance of the Lu doped HZO films. It is hoped that the results can provide an effective approach for the realization of high-performance and highly reliable hafnium oxide based ferroelectric thin films.
研究领域:
材料科学
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铁电材料
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薄膜
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高影响因子
RSC Advances
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2017
·Vol. 7
·期 47
·29378-29385
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IF 3.108
Leyan Nian,Junben Huang,Kui Wu,Zhi Su,Zhihua Yang,Shilie Pan
Five non-centrosymmetric (NCS) quaternary metal chalcogenides, BaCu2SiSe4, BaCu2GeS4, BaCu2GeSe4, BaCu2SnS4, and BaCu2SnSe4, were successfully synthesized by solid-state reaction in vacuum-sealed silica tubes. They crystallized in the three different space groups: Ama2 for BaCu2SnSe4, P3121 for BaCu2GeS4 and BaCu2GeSe4, and P3221 for BaCu2SiSe4 and BaCu2SnS4. Note that BaCu2GeS4 and BaCu2GeSe4 show the mirror symmetrical structures to those of BaCu2SiSe4 and BaCu2SnS4. In comparison with their structures, it can be found that the [CuSe4] units are connected together to form a two-dimensional (2D) layer structure in BaCu2SnSe4, which is different from the 3D framework structure formed by the interlinked [CuQ4] (Q = S and Se) units in other four title compounds. In addition, BaCu2SnSe4 exhibits only one type of tunnel structure with the isolated [BaSe8] units existing in each tunnel, which is also different from the other title compounds (two types of tunnels with the isolated [BaSe8] units and [BaSe6]n chains located). The interesting structural changes also indicate that slight change of cation size would result in different structure features, and future structure prediction should devote considerable attention to the different chalcogen atoms. Moreover, important optical properties (optical bandgap, infrared (IR) absorption edge, second harmonic generation (SHG) response) of the title compounds were systematically investigated. Among them, IR and Raman spectra indicate that all of them exhibit the wide IR absorption edges (∼22 μm). Powder SHG measurement shows that BaCu2SnS4 possesses good SHG response about 1.6 times that of benchmark AgGaS2 (AGS) at the particle size 55–88 μm. All results indicate that BaCu2SnS4 can be expected as a potential IR nonlinear optical (NLO) candidate. Theoretical calculation was also used to analyze the structure–property relationship and their electronic structures and origin of NLO effect were studied in detail.
研究领域:
材料科学
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晶体学
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光学
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高影响因子
CERAMICS INTERNATIONAL
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2025
·
IF 5.6
Yong Zhang,Yuchang Qing,Junjie Yang,Chuanyang Jiang
SiC, with outstanding oxidation stability and tunable dielectric property, has been regarded as a promising microwave absorption material for high-temperature applications. However, the application of pristine SiC is restricted by its inadequate dielectric response and weak loss capability. Herein, a novel strategy is proposed to construct Cr-Si-C conductive shell on SiC surface via molten salt method is proposed to introduce heterogeneous interfaces and enhance dielectric loss. The optimal SiC@Cr-Si-C core-shell sample achieves a minimum reflection loss (RL m ᵢ n ) of −36.7 dB at a matching thickness of 1.4 mm. Meanwhile, it exhibits an effective absorption bandwidth (EAB) of 2.41 GHz. Notably, even after heat treatment at 600 °C in air for 5 h, the core-shell absorber maintains an intact core-shell structure and its RL m ᵢ n remains as high as −34.4 dB, demonstrating superior high-temperature stability. This work provides an effective method for high-performance microwave absorption materials targeted at high-temperature applications.
研究领域:
材料科学
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电磁功能材料
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介电材料
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高温材料
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复合材料
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高影响因子
JOURNAL OF POWER SOURCES
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2025
·
IF 7.9
Jiao Ma,Qin Zhu,Zhihui Qian,Wei Bai,Rui Liu,Long Shi,Yongsheng Yang,Yujiao Guo,Mingwu Xiang,Junming Guo
The drawbacks of Jahn-Teller (J-T) effect, capacity decay at high temperature and the dissolution of Mn generated at elevated current density limit the large-scale application of LiMn 2 O 4 batteries . Herein, a Si 4+ /Al 3+ co-doping strategy of LiMn 2 O 4 is carefully developed to stabilize the [MnO 6 ] framework, thereby inhibiting the J-T distortion and ultimately alleviating Mn dissolution. The incorporation of Si 4+ and Al 3+ in LiMn 2 O 4 promotes the formation of a single-crystal truncated octahedral structure, with preferential grain growth along the {111}, {100} and {110} crystal plane, which decreases Mn dissolution and enhances the Li + transfer pathways. Furthermore, the integration of Si 4+ /Al 3+ co-doping producing smaller particles can shorten the migration paths of electrons and ions. Consequently, the optimized LiSi 0.05 Al 0.09 Mn 1.86 O 4 displays a decent initial discharge specific capacity of 103.2 mAh·g −1 and an excellent capacity storage percentage of 79.7 % after 1000 cycles at 10 C. Meanwhile, the optimal sample also exhibits respectable first discharge capacities of 91.9 mAh·g −1 and 61.8 mAh·g −1 at ultra-high rates of 20 C and 40 C, along with superior capacity storage ratios of 70.9 % and 70.7 % after 1000 cycles. More importantly, the optimized sample shows remarkable first discharge specific capacity of 107.1 mAh·g −1 at 55 °C and 10 C and exciting capacity storage rate of 61.9 % after 500 cycles. This study serves as a guide for advancing high-performance, high-stability LiMn 2 O 4 cathode materials for use in lithium-ion batteries.
研究领域:
材料科学
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电化学
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能源存储
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无机化学
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固态化学
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锂离子电池
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高影响因子
Small
·
2017
·Vol. 13
·期 18
·1604033
·
IF 8.643
Shuo Chen,Xuemei Liu,Xvsheng Qiao,Xia Wan,Khurram Shehzad,Xianghua Zhang,Yang Xu,Xianping Fan
An effective colloidal process involving the hot-injection method is developed to synthesize uniform nanoflowers consisting of 2D γ-In 2 Se 3 nanosheets. By exploiting the narrow direct bandgap and high absorption coefficient in the visible light range of In 2 Se 3 , a high-quality γ-In 2 Se 3 /Si heterojunction photodiode is fabricated. This photodiode shows a high photoresponse under light illumination, short response/recovery times, and long-term durability. In addition, the γ-In 2 Se 3 /Si heterojunction photodiode is self-powered and displays a broadband spectral response ranging from UV to IR with a high responsivity and detectivity. These excellent performances make the γ-In 2 Se 3 /Si heterojunction very interesting as highly efficient photodetectors.
研究领域:
材料科学
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光电子学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Danhua Liu,Xin Liu,Jian Wang,Xinhua Mao,Xiaochang Xu,Xi’an Fan
The effect of Fe nanoparticles with mass fraction of 0-7 wt% on the microstructure and soft magnetic properties of the Fe-6.5 wt%Si soft magnetic composites (SMCs) was investigated. The results show that the pores between Fe-6.5 wt%Si powders can be effectively filled by Fe nanoparticles , thereby correspondingly increasing the density of the SMCs. At the same time, the magnetic permeability of the SMCs mixed with different mass fraction of Fe nanoparticles has improved significantly and exhibits good frequency stability compared with the absence of Fe nanoparticles. It also reveals that the addition of 1 wt% Fe nanoparticles can reduce the eddy current loss of the SMCs by decreasing its intra-particle eddy current loss. When the addition of Fe nanoparticles is 3 wt%, the SMCs exhibits good magnetic properties with high magnetic permeability (increased by 24%) and relatively low core loss.
研究领域:
材料科学
·
磁学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Hongye Zhao,Xiangyang Xu,Yunfei Yao,Yina Li
Si/graphene composite has been considered as a promising structure to limit the volume expansion and improve poor conductivity of silicon anode. Herein, a novel method to prepare Si/reduced graphene oxide (Si/rGO) composite anode was proposed. With this approach, nickel shell was pre-coated on Si particles via electroless deposition before used as a template to in-situ reduce GO. During the reduction process, the nickel template can as well promote the self-assembly of graphene sheets on the surface of Si nanoparticles. Following these facile and convenient processes, a Si/rGO hybrid-structure can be directly fabricated. Compared with pure Si anode, this Si/rGO composite displays a greatly improved electrochemical performance in both cycling stability and rate capability. It delivers a reversible capacity as high as 975 mA h g −1 and 717 mA h g −1 after 300 cycles under the current densities of 1 A g −1 and 3 A g −1 , respectively. Meanwhile, its capacity can still maintain at 602 mA h g −1 even at a rather higher current of 5 A g −1 .
研究领域:
材料科学
·
能源存储
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高影响因子
Polymers
·
2026
·Vol. 18
·期 15
·1890
·
IF 5.8
Ley Boon Sim,Jia Han,Yongming Zeng,Haoqi Wang,Yujia Qin,Weiwei Wang,Haiping Yang,Aygul Kadir
Numerous previous investigations have exploited single-component aluminum hydroxide, silica, or phosphorus-containing organic agents to improve the fire resistance of epoxy resin. Existing literature confirms that ATH relies on endothermic dehydration and inorganic barrier layers to suppress combustion, while phosphorus organics exert radical quenching effects in the gas phase. However, separate use of these fillers generally requires high loading to achieve satisfactory flame retardancy, which inevitably weakens the mechanical properties of the epoxy matrix; few studies integrate N, P, and Si elements into ATH via chemical grafting to realize synergistic flame retardancy at low filler dosage, and the dual heat-transfer regulation effect of formed SiO2-Al2O3inorganic residues has rarely been systematically discussed in prior reports. This study presents an organic–inorganic hybrid flame retardant, SPDP-PTMS@ATH, synthesized by grafting N,P,Si-containing organic groups onto Al(OH)3. The modified ATH retained its layered structure, as confirmed by FTIR, XPS, SEM, and XRD. At only 5 wt.% loading in epoxy, the additive significantly enhanced flame retardancy and smoke suppression: LOI increased to 33.5% (34% higher than pure EP), UL-94 reached V-0 rating, and peak HRR, THR, COPR, TSR, CO2PR, and SPR are reduced by 30.2%, 30.8%, 33.1%, 26.9%, 25.86%, and 15%, respectively. Char analysis revealed a denser, more graphitized structure with fewer defects. Moreover, tensile strength and elongation at break improved by 22.0% and 47.5%, respectively. This work demonstrates that low-loading SPDP-PTMS@ATH simultaneously boosts fire safety, smoke suppression, and mechanical performance, offering a cost-effective and sustainable route to high-performance epoxy composites.
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DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2026
·
IF 8.4
Meng Tian,Shijie Zhou,Yi Tian,Xuan Luo,Luhan Wang,Miaomiao Xu,Linlin Hu
Silicon-carbon composite material (Si/C) with high specific capacity is regarded as the most promising alternative to graphite and has been commercialized gradually. However, the practical implementation of Si/C anodes remains challenging due to electrode structure disintegration and interfacial instability induced by the substantial volume change of the internal Si-based particles. Herein, we synthesized a hydro-soluble binder with modulated mechanical properties by radical polymerization between acrylic acid (AA) as hard monomer and 2-methoxyethyl acrylate (MEA) as soft monomer simply for Si/C anodes. The as-developed binder exhibits the trade-off mechanical properties between elasticity and rigidness, excellent adhesivity and enhanced lithium-ion diffusion compared with PAA, which is conducive to accommodate the significant volume variation of Si/C during cycling and keeping the integrity of electrode structure. The Si/C anode with P(AA-co-MEA) binder manifests the improved cycling stability (502 mAh g −1 and 82.6% capacity retention rate after 500 cycles at 0.5C) and rate capability compared to that with PAA binder. This work offers valuable insights into the pursuit of high-capacity lithium-ion batteries (LIBs) with enhanced cycling stability.
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高影响因子
Materials Today Communications
·
2026
·
IF 4.9
Kun Zhang,Boran Wang,Yu Chen,Ze Wu,Jiachen Liu,Liwen Yan,Anran Guo
Ceramic cores are critical components for the fabrication of single-crystal alloy blades in aero-engines. At present, the preparation of ceramic cores with complex structures via vat photopolymerization (VPP) 3D printing technology is a major research focus in the relevant field. However, during the VPP 3D printing of ceramics, ultraviolet light scatters easily under the influence of ceramic particles, making the overcuring of ceramic slurries inevitable, which increases the overcuring width of the system and significantly impairs the forming accuracy of ceramic cores. To solve the above problem, this study inhibits overcuring by adding pre-oxidized nano-silicon powder and systematically investigates the effect of pre-oxidized nano-silicon powder content on the forming accuracy and properties of silicon-based ceramic cores. The results show that when the addition amount of pre-oxidized nano-silicon powder is 5 wt% and the slice thickness is 100 μm, the overcuring phenomenon of the prepared ceramic components is negligible. When the sintering temperature is 1200 °C, the ceramic core with 5 wt% pre-oxidized nano-silicon powder exhibited excellent mechanical properties. Under this condition, the flexural strength of the ceramic core reached 13.4 MPa, with a shrinkage rate of 4.21%. This study provides an effective scheme for the additive manufacturing of high-precision ceramic cores.
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高影响因子
Applied Materials Today
·
2026
·
IF 7
Tongtong Kang,Changyong Lan,Shuren Zhou,Xinyi Luo,Xiaoqi Gao,Haodong Fan,Yi Yin,Chun Li
1T’-MoTe 2 /flat-Si and 1T’-MoTe 2 /pyramidal-Si heterojunction photodetectors were in-situ fabricated. • The MoTe 2 /pyramidal-Si heterojunction photodetector exhibits 31% enhancement in responsivity compared with the MoTe 2 /flat-Si counterpart. • The MoTe 2 /pyramidal-Si heterojunction photodetector exhibits broadband spectral response (400-1550 nm), high responsivity (451 mA/W), high specific detectivity (7.8 × 10 11 Jones), and fast response (4 μs). • An 8 × 8 photodetector array is fabricated and demonstrates good imaging capability. Mixed van der Waals (vdW) heterojunction photodetectors have attracted considerable attention in recent years due to synergistic effects of component materials with different dimensions, which enable enhanced performance. Among these mixed vdW heterojunctions, two-dimensional (2D) material/Si heterojunction photodetectors hold great promise, combining the superior optoelectronic properties of 2D materials with the mature processing technology of Si. In this work, we report the fabrication of a 1 T′-MoTe 2 /pyramidal-Si heterojunction photodetector via sputtering and subsequent in-situ thermal conversion. Compared with the MoTe 2 /flat-Si counterpart, the MoTe 2 /pyramidal-Si photodetector shows a 31% enhancement in responsivity, reaching 451 mA/W at 820 nm. In addition, it exhibits excellent photodetection performance in terms of specific detectivity (7.8 × 10 11 Jones at 850 nm under zero bias), broadband spectral response (400–1550 nm), large linear dynamic range (162 dB), and fast response (4 μs at 850 nm under a bias voltage of −5 V). An 8 × 8 photodetector array is fabricated and demonstrates good imaging capability. Our work provides a novel approach for developing high-performance mixed vdW heterojunction photodetectors. Download: Download high-res image (207KB) Download: Download full-size image
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危险品化学品经营许可证（带存储）