Journal of Magnesium and Alloys
·
2022
·
IF 11.813
Yongyang Zhu,Mili Liu,liming Zeng,Yin Wang,Daifeng Wu,Rui Li,Qing Zhou,Renheng Tang,Fangming Xiao
The hydrolysis of MgH 2 delivers high hydrogen capacity (15.2 wt%), which is very attractive for real-time hydrogen supply. However, the formation of a surface passivation Mg(OH) 2 layer and the large excess of H 2 O required to ensure complete hydrolysis are two key challenges for the MgH 2 hydrolysis systems. Now, a low-cost method is reported to synthesize MgH 2 @Mg(BH 4 ) 2 composite via ball-milling MgH 2 with cheap and widely available B 2 O 3 (or B(OH) 3 ). By adding small amounts of B 2 O 3 , the in-situ formed Mg(BH 4 ) 2 could significantly promote the hydrolysis of MgH 2 . In particular, the MgH 2 –10 wt% B 2 O 3 composite releases 1330.7 mL·g −1 H 2 (close to 80% theoretical hydrogen generation H 2 ) in H 2 O and 1520.4 mL·g −1 H 2 (about 95%) in 0.5 M MgCl 2 in 60 min at 26 °C with hydrolysis rate of 736.9 mL·g −1 ·min −1 and 960.9 mL·g −1 ·min −1 H 2 during the first minute of the hydrolysis, respectively. In addition, the MgCl 2 solution allows repeated use by filtering and exhibits high cycle stability (20 cycles), therefore leading to much reduced capacity loss caused by the excess H 2 O. We show that by introducing B 2 O 3 and recycling the 0.5 M MgCl 2 solution, the system hydrogen capacity can approach 5.9 wt%, providing a promising hydrogen generation scheme to supply hydrogen to the fuel cells.
研究领域:
材料科学
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能源化学
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无机合成
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氢能技术
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表面工程
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DOI
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2024
·Vol. 49
·期 9
·e202400122
·
IF 1.7
Yang Qin,Jie Liu,Jiangbao Zeng,Jinbin Zou,Ye Song,Fengsheng Li
To improve the ignition and combustion performance of boron (B), the B@ potassium perchlorate (KP) composite micro-units are successfully prepared by recrystallization of solvent evaporation. The morphology and structural composition show that B@KP composite micro-units are formed by the gentle recrystallization of KP at the heterogeneous interface between B particles and solvents. It is shown by thermal analysis that the initial thermal decomposition temperature of KP is reduced by 49 °C due to the reduction of particle size. In addition, the heat of 420 J/g released by the thermal decomposition of KP is beneficial to the evaporation of the oxide boron (B 2 O 3 ) film on the surface of B, which reduces the initial oxidation temperature of B by 185 °C and improves the ignition performance of B. Interestingly, the oxygen (O 2 ) released by the thermal decomposition of KP quickly reacts with B to release heat of 3608 J/g, which improves the combustion performance of B. The optimal mass ratio of B to KP is 1: 5, which results in the ignition delay time of 641 ms, a reduction of 19 ms compared to the physical mixed sample. The ignition delay times of other samples are 724 ms, 680 ms and 650 ms respectively, and B could not be ignited successfully. In the combustion process, all samples emit a bright green flame of B combustion, and even a fierce combustion flame like a mushroom cloud appears. In a word, the B@KP composite micro-units have great potential for application in solid propellants.
研究领域:
材料科学
·
燃烧与推进
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DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Ruifen Sun,Jie Chen,Weiwei Zhang,Yun Huang,Jingcheng Zheng,Yuwu Chi
As recently emerging nanomaterials, boron nanosheets (BNSs) have attracted more and more attention in various fields such as supercapacitors, photodetectors, bioimaging, and electrocatalysis due to their advantages of good biological compatibility, environmental friendliness, and good electro-optical properties. However, the study and application of BNSs in chemical and biological sensing are still in the infant stage, mainly due to the requirement of complicated, high-cost, and time-consuming preparation strategies. In this work, a new class of BNSs, namely oxidized-BNSs (i.e., ox-BNSs), were easily and rapidly synthesized by chemically treating boron powder with diluted HNO3 in a very short time (less than 15 min). The composition, morphology, optical property, and peroxidase mimetic activity of obtained ox-BNSs were investigated in detail. The prepared ox-BNSs were several-layered nanosheets with abundant oxygen-containing groups, emitted blue fluorescence, and possessed good intrinsic peroxidase mimetic activity, based on which a sensitive and selective colorimetric sensor was developed for detection of H2O2 and glucose. The new easy preparation strategy and good sensing performances of the prepared ox-BNSs would greatly stimulate the study and application of BNSs in chemo- and biosensing.
研究领域:
材料科学
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分析化学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Xingmei Li,Xingyu Liu,Yingying Zhao,Jingxia Zheng,Lin Chen,Yongzhen Yang,Xuguang Liu
Carbon dots (CDs) as afterglow materials have advantages including easily available raw materials, cost effectiveness, low toxicity, facile surface functionalization, and tunable spectra, demonstrating potential applications in anti-counterfeiting, information encryption, optoelectronics, sensing, and bioimaging. However, most current CD-based afterglow materials exhibit either room-temperature phosphorescence (RTP) or thermally activated delayed fluorescence (TADF) emission, with few demonstrating both properties simultaneously. Their short afterglow lifetimes further limit practical applications. Herein, a long-lifetime dual-mode afterglow F, N-CDs@BA composites were prepared by fluorine doping strategy using boron oxide (B 2 O 3 ) as the matrix. The TADF emission wavelength of F, N-CDs@BA is 430 nm, the lifetime is 1.21 s, and the afterglow is visible to the naked eye for about 11 s. The RTP emission wavelength is 510 nm, the lifetime is 0.47 s, and the afterglow is visible to the naked eye for about 13 s. Structural and optical characterizations revealed that the afterglow sources of F, N-CDs@BA composites at 430 and 510 nm originate from F, N-CDs and B 2 O 3 matrices, respectively. Comparative analysis of structural and optical properties, combined with density functional theory calculations of electronic bandgap changes, confirmed that fluorine incorporation reduces the band gap and prolong the afterglow lifetime. All F, N-CDs embedded in different matrices exhibit afterglow emission, demonstrating their matrix universality. Finally, F, N-CDs@BA composites show potential application value in graphic anti-counterfeiting.
研究领域:
材料科学
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纳米技术
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光电子学
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发光材料
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化学合成
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Yaping Wang,Yike Li,Jingli Zhao,Jianshe Wang,Zhongjun Li
Developing high activity and eco-friendly photocatalysts for water splitting is still a challenge in solar energy conversion . In this paper, B doped g-C 3 N 4 quantum dots (BCNQDs) were prepared via a facile molten salt method using melamine and boron oxide as precursors. By introducing BCNQDs onto the surface of g-C 3 N 4 , g-C 3 N 4 /BCNQDs heterojunction was constructed via hydrothermal treatment . The resulting g-C 3 N 4 /BCNQDs heterojunction exhibits enhanced hydrogen evolution performance for water splitting under visible light irradiation . The mechanism underlying the improved photocatalytic activity was explored and discussed based on the formation of heterojunction between g-C 3 N 4 and BCNQDs with well-matched band structure .
研究领域:
材料科学
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化学
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能源科学
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环境科学
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产品关联
DOI
高影响因子
Journal of Cleaner Production
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2020
·
IF 7.246
Bo Lei,Yanhong Feng
Thermoplastic bio-based materials from lignocellulosic fibers are of great importance in a sustainable society. To enhance their preparation to an industrial scale, a facile strategy is proposed that combines continuous steam explosion (CSE) with periodate oxidation/borohydride reduction to modify sisal fibers . In the CSE pretreatment , the aldehyde content of oxidized products was increased by a maximum of ∼17%, and the yield of oxidized/reduced products was increased by a maximum of 25%. Furthermore, the tensile strength of hot-pressed sheets was increased to 42.2 MPa, representing a 175% improvement compared with sheets without CSE pretreatment, and a decreased glass transition temperature of ∼132 °C. Results indicated that CSE pretreatment was favorable for improving the modification efficiency and uniformity of sisal fibers, simultaneously achieving much better mechanical properties and thermoplasticity . Appropriate oxidation level of sisal fibers also achieved the better performances. The combined strategy was facile and scalable, and might significantly impact the widespread preparation and utilization of thermoplastic bio-based materials.
研究领域:
材料科学
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生物质能
·
化学工程
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Zhewen Ma,Yuanhao Feng,Alex Y. Song,Toan Dinh,Min Hong,John Bell,Boyou Hou,Pingan Song,Wei Zheng
Passive radiative cooling (PRC) coatings play a significant role in reducing energy consumption by cooling buildings. Unfortunately, due to the lack of an integrated design, most existing PRC coatings are susceptible to UV aging and rain, and fail to resist aperiodic fire attacks, restricting their practical applications for buildings in the wildland-urban interface (WUI). To fill this research gap, an integrated composition design strategy is proposed to develop a scalable, durable, and fire-safe PRC coating comprising of a molecularly engineered fire-retardant copolymer adhesive, hollow glass microspheres (HGMs), and boron oxide (B 2 O 3 ). Besides intrinsic fire retardancy, the copolymer endows the coating with a strong adhesion to diverse substrates. HGMs enable the coating to show good thermal insulation and a high solar reflectance (>94%), and B 2 O 3 promotes the in situ formation of a robust non-combustible ceramic char layer in fires. The coating achieves an unparalleled fire resistance (UL-94 V-0 rating, LOI: 88.5 vol.%), a high mid-infrared emissivity (>95%) for efficient heat dissipation, and exceptional durability against UV-aging and rain. The performance integration makes as-developed PRC coatings outperform most existing PRC counterparts. This work offers an integrated design solution to developing fire-safe PRC coatings toward safe and sustainable buildings.
研究领域:
材料科学
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建筑技术
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消防安全工程
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可持续能源
·
高分子科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Huilin Lun,Yi Zeng,Xiang Xiong,Houbu Li,Ziming Ye,Xiaoxu Liu
This work introduces fabricating single-phase ternary-anion carbide solid solution via solid-state diffusion of B and N. Initially, non-stoichiometric (Zr,Hf,Ti)C x with carbon vacancies was synthesized by modified spark plasma sintering. Then, using B 2 O 3 and g -C 3 N 4 as sources, (Zr 0.3 Hf 0.5 Ti 0.2 )(C 0.87 B 0.03 N 0.07 ) with face-centered-cubic structure was produced via B diffusion at 1100 °C and N diffusion at 1600 °C. Trace B (0.23 wt%) and N (0.71 wt%) in (Zr 0.3 Hf 0.5 Ti 0.2 )(C 0.87 B 0.03 N 0.07 ) was found to significantly enhance the oxidation resistance (higher onset temperature 520 ± 3 °C (particle size 2.5 ± 1.3 μm) than 475 ± 3 °C of (Zr 0.3 Hf 0.5 Ti 0.2 )C 0.85 and improve structural stability with more negative binding energy.
研究领域:
材料科学
·
陶瓷
·
固态化学
·
高温材料
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2025
·
IF 3.3
Yanhui Zhang,Jiajia Li,Yaqing Ding,Kaitong Liu,Xiaofeng Gu
The mixed-anionic compounds are attractive hunting grounds for probing optical crystals due to their interesting physiochemical properties. Herein, the first barium fluoroaluminophosphate, BaAlPO4F2, was synthesized by high temperature reactions in the closed system for the first time. In the structure, the PO4 group bonds with [Al2O6F5] dimers to form the unusual [Al2PO5F4]∞ 2D layers and the Ba2+ cations reside in the interlayer space. This paper discusses the flexibility and diversity of the assembly s
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Mengdi Ye,Yongmin Duan,Zhaojing Kuang,Wenyan Zheng,Junjie Zhang
With the advancement of modern optics and information technology, luminescent reversible photochromic transparent glasses have attracted considerable attention due to their potential for multimodal data storage. Cadmium-based glasses exhibit excellent photochromic performance, however, their underlying mechanism remains insufficiently elucidated. In this work, Tb 3+ -doped transparent cadmium glass was fabricated, which underwent a rapid transition from transparent to dark brown within 60 s under 365 nm UV irradiation, and completely recovered to transparency upon thermal treatment at 200 ℃, demonstrating high reversibility and cycling stability. X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) analyses revealed that the photochromism is primarily governed by oxygen-vacancy-related color centers, wherein Cd sites serve as electron-enriched centers while Pb-O environments accommodate localized holes. Their spatially coupled charge compensation stabilizes the color centers and sustains reversibility. On this basis, reversible modulation of Tb 3+ luminescence was achieved, with a maximum emission contrast of 93.9 %. This study clarifies the mechanism of cadmium-based photochromic glass from the perspective of defect-charge compensation and provides insights into the design of multifunctional glasses for optical information storage.
研究领域:
材料科学
·
光学材料
·
光子学
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固态化学
·
信息存储技术
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产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Junping Shi,Lielin Wang,Qibiao Wang,Chao Deng,Xiuqi Pu,Shidi Yao,Liang Jiang,Qiuyi Wang
Present study reveals the effects of varying concentrations of Pr 2 O 3 on the Spectral characteristics of 35PbO-60-xB 2 O 3 -5ZnO-xPr 2 O 3 (x = 0.5–3mol%) glasses, which were prepared using the melt-quench technique. The XRD and Raman results confirm that the glasses possessed the amorphous nature with borate complexes as the main structure units. From the absorption spectrum , the glass has a strong absorbance in the visible and infrared regions. The theoretical and experimental oscillator strengths ( f exp and f c a l ), phenomenological parameters (Ω 2 , Ω 4 , Ω 6 ) of Pr 3+ were calculated using the Judd-Ofelt theory. Strong emissions in the reddish orange region at 600 nm was observed due to the transitions of Pr 3+ ions from 1 D 2 → 3 H 4 at 444 nm excitation. The optimal concentration of Pr 2 O 3 in the glass is 1 mol%, exhibiting the highest photoluminescence intensity and the second longest decay time (microsecond order). The decay time reduction with increasing Pr 2 O 3 content, indicates the presence of resonant energy transfer between Pr 3+ ions. Therefore, the Pr 3+ -dope lead zinc borate glasses could be used for red LED.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 10
·12663-12672
·
IF 5.6
Jiali Li,Hanlu Xing,Shijie Xue,Tao Ma,Jun Sun,Kun Hu,Lin Chen,Xiaoxiao Li,Yi Gong,Xian Zhang,Xingyou Tian
The application field of low temperature co-fired ceramics (LTCC) has been further expanded with the development of electronic packaging technology. Nevertheless, during the preparation process, solvents often volatilize leading to toxicity to humans and environmental pollution. Furthermore, in certain applications, LTCC materials must possess higher strength and thermal conductivity . Herein, we developed a kind of Bi 2 O 3 -B 2 O 3 -SiO 2 -CuO-Al 2 O 3 (BBSCA)/Al 2 O 3 /Al 2 O 3 fibers LTCC composites, synthesized by aqua-based molding and hot-press solid-state reaction method. The addition of Al 2 O 3 fibers can construct the two-dimensional structure and enhance thermal conductivity of the composites. When the Al 2 O 3 fibers content reaches 2 wt%, the resulting composite exhibits a significant bending strength of 308 MPa and an elevated thermal conductivity of 9.31 W/(m·K). Additionally, the composites exhibit excellent dielectric properties , with a dielectric constant of 10.17 and tanδ = 1.24 × 10 −3 at 13 GHz. This work provides a novel approach to construct high-strength and high thermal conductivity LTCC based on environmentally friendly preparation processes.
研究领域:
材料科学
·
陶瓷与复合材料
·
电子封装
·
热管理
·
介电材料
✓ 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）