ENERGY & FUELS
·
2024
·
IF 5.2
Ziyi Li,Li Huang,Xiaoyang Yu,Kun Huang,Wenbo Cui,Hong Zhang
The development of stable and efficient ODS catalysts for achieving room-temperature catalytic oxidation desulfurization is one of the challenges in the field of catalytic oxidation desulfurization. This work successfully synthesized and evaluated a new type of composite catalyst, Mo8/h-BN, using the wet impregnation method to investigate its desulfurization performance under various conditions. ODS tests were conducted on DBT, BT, and 4,6-DMDBT using Mo8/h-BN as the catalyst, H2O2 as the oxidant, and [BMIM]PF6 as the extractant. Characterization and testing revealed that Mo8/h-BN exhibited excellent ODS activity, converting DBT completely at 60 °C in 10 min. This study not only explored the optimal desulfurization conditions but also investigated the desulfurization performance of the catalyst at room temperature. Additionally, it is speculated that there may be an electron transfer between Mo8 and h-BN, which enhances the stability of the catalyst. Finally, possible CODS mechanisms were inferred through GC-MS and free radical trapping experiments. In conclusion, the composite catalyst Mo8/h-BN provides a new pathway for developing low-energy consumption, sustainable, cost-effective, and efficient desulfurization catalysts.
研究领域:
催化化学
·
能源化学
·
环境科学
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产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Qingfu Ban,Yan Li,Yusheng Qin,Yaochen Zheng,Jie Kong
Hyperbranched star copolymers are important soft materials that have been employed for aqueous self-assembly and bioapplication, but their one-pot one-batch synthesis strategy and relevant topology are rarely discussed. In this contribution, we produce hyperbranched star poly(vinyl ether ester)s (mPEG- hb -PVEEs) amphiphiles with multimodal molecular weight distribution via one-pot one-batch Am+Bn+C1 (m ≥ 2, n ≥ 3) step-growth polymerization. Based on the topological analysis of these hyperbranched star copolymers, a convenient expression of the number ratio of monomeric structural units (N A /N B ) is deduced to describe the cyclic defect of intramolecular cyclization only by using proton nuclear magnetic resonance spectroscopy. The introduction of long-chain terminators and the change in the molar feed ratio of A 2 :B 3 :C 1 considerably affect the N A /N B so as to give rise to increased influence of number of macromolecules and decreased influence of intramolecular cyclization, which are then responsible for an aqueous self-assembly behavior of mPEG- hb -PVEEs amphiphiles. Overall, this study opens new possibilities for the precise description of intramolecular cyclization and controllable synthesis of hyperbranched star copolymers via one-pot Am+Bn+C1 step-growth polymerization.
研究领域:
高分子科学
·
材料科学
·
化学工程
·
生物技术
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Ruxia Song,Shihong Zhang,Yi He,Bo Liu,Hongjie Li,Zhifei Zhang,Yahui He
In this study, a novel Ni-Cu/OH-BN(h)-PA-Zn-DCD composite coatings with excellent wear resistance and corrosion resistance was developed, which may be used in the field of seawater corrosion. By the self-assembling of phytic acid, Zn 2+ and dicyandiamide to grow PA-Zn-DCD structure onto the surface of hydroxylated BN(h) nanosheets, obtained a hybrid denoted as OH-BN(h)-PA-Zn-DCD, which was doped into Ni-Cu coating by pulse electrodeposition. The results show that OH-BN(h) and OH-BN(h)-PA-Zn-DCD hybrids affect the surface morphology, roughness, microcrystals size and thickness of the composite coatings. Simultaneously, compared with NC coating and NC/HB-1.5 coating, NC/BP-1.5 coating has the highest microhardness (559.26 Hv), the lowest friction coefficient (0.172), and the best corrosion resistance (i corr is 3.551 × 10 −8 A·cm −2 , R ct is 1.098 × 10 6 Ω·cm 2 ). In addition, the EIS results of the immersed specimens showed that the NC/BP-1.5 composite coating still has good protective ability after soaking for 15 days in simulated seawater medium (R ct is 7.434 × 10 6 Ω·cm 2 ).
研究领域:
材料科学
·
表面工程
·
腐蚀科学
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Shuquan Yang,Lan Zhang,Meihui Xiao,Lin Chen,Jun Sun,Jianjun Ding,Xiaoxiao Li,Yi Gong,Kang Zheng,Xian Zhang,Xingyou Tian
Microwave devices with reduced dielectric loss and electronic components with increased integration density necessitate the higher performance of electronic packaging materials. The h-BN/AlN/CaCO 3 -MgO-B 2 O 3 -SiO 2 -Li 2 CO 3 glass composites were prepared via tape-casting and then sintered by pressureless and hot-pressing, respectively. The thermal conductivity of pressureless sintered composite was increased to 6.55 W/(m·K) by incorporating 3 wt% h-BN, and the thermal expansion of 4.47 ppm/K was achieved along with low dielectric constant of 5.76 and dielectric loss of 7.02 × 10 −4 at 24 GHz. In contrast, the hot-pressing sintered composite containing 4 wt% h-BN exhibited higher thermal conductivity of 10.3 W/(m·K) and lower dielectric loss of 4.77 × 10 −4 . The microstructure characterization indicated the construction of heat conduction networks, and XRD analysis illustrated the formation of crystallization in the glass. Such low-temperature co-fired ceramic (LTCC) with high thermal conductivity and low dielectric loss would be a promising candidate for electronic packaging and 5G communication applications.
研究领域:
材料科学
·
电子工程
·
陶瓷工程
·
通信技术
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产品关联
DOI
高影响因子
Advanced Fiber Materials
·
2023
·Vol. 5
·期 5
·1657-1670
·
IF 16.1
Liu Yong,Zhao Ning,Xu Jian
As portable and wearable electronic devices are rapidly developing, there is an urgent need for flexible and robust thermally conductive electromagnetic interference shielding materials to address the associated electromagnetic pollution and overheating issues. Herein, multifunctional poly(p-phenyl-2,6-phenylene bisoxazole) nanofiber/boron nitride nanosheet/Ti 3 C 2 T x MXene nanosheet (PBO/BN/MXene) composite papers are prepared by a gel microparticle-mediated ordered assembly process with the aid of vacuum-assisted filtration. Nacre-like “brick and mortar” structure, segregated structure and sandwich structure are integrated into the composite paper, so that efficient thermally and electrically conductive networks have been established. When the BN and MXene contents are 29.2 wt% and 41.7 wt%, the 13 μm thick composite paper exhibits an EMI shielding performance of 31.8 dB and a thermal conductivity of 26.1 W/mK, markedly superior to those of the control samples without the ordered structures. Meanwhile, because of the unique architecture and inherent advantages of the building blocks, the composite paper exhibits extremely low coefficient of thermal expansion (~ 1.43 ppm/K), excellent mechanical properties, and outstanding thermal stability and flame retardance, making it highly advantageous for practical applications in electronic devices. This work offers a promising approach for fabricating high-performance multifunctional composites by constructing efficient filler networks. Graphical Abstract
研究领域:
材料科学
·
电气工程
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纳米技术
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复合材料
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热管理
·
电磁兼容
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zahoor Ahmad,Jianjun Chen,Hafsa,Zaheer Hussain,Muhammad Arfan,Tauseef Shahid,Fakhr e Alam
Chopped carbon fiber (CC f ) reinforced SiC ceramic matrix composites (CC f /SiC CMCs) hold potential as thermal structural materials. In this work, we investigated the impacts of dual protective interphases (pyrolytic carbon/boron nitride (PyC/BN)) deposited via chemical vapor deposition (CVD), along with the incorporation SiC whiskers (SiC w ) contents (20 wt%) on the structure and properties of as-fabricated CC f /SiC CMCs by NITE route. Structural and mechanical characteristics were explicated by the relevant advanced characterization tools. The introduction of PyC/BN dual protective interphase effectively preserved its integrity at elevated temperature and improved the toughness significantly via fiber pull-out and interfacial debonding mechanisms. Furthermore, incorporating 20 wt% SiC whiskers (SiCw) as secondary reinforcement yielded a synergistic toughening effect, promoting both the crack bridging and fiber pull-out behavior. This dual toughening mechanism led to a notable enhancement in mechanical performance, revealing an optimum bending strength of ∼356 ± 9.089 MPa, and toughness of ∼5.31 ± 0.194 MPa m 1/2 . Additionally, the inclusion of SiCw contributed to the creation of spatial network structure, potentially reducing the thermal expansion. The insights from this study advance the understanding of microstructural engineering in CC f /SiC composites, enabling future low-cost design and manufacturing of high-performance composites for extreme environments.
研究领域:
材料科学
·
陶瓷基复合材料
·
机械工程
·
热结构材料
·
微观结构工程
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Zixuan Li,Dequan Bao,Wei Zhao,Wenxuan Xu,Yingheng Huang,Xiyong Chen,Hao Zhang,Xuhui Sun
Gel polymer electrolytes (GPEs) have emerged as a highly promising alternative to conventional liquid electrolytes for stable lithium-metal batteries (LIBs). However, their inherent poor mechanical properties and limited interfacial compatibility with lithium metal usually lead to unexpected growth of lithium dendrites , hindering commercial viability. Herein, an asymmetric polymer electrolyte with h-BN (HGPE) as protective layer was fabricated via a facile one-step coating strategy. Compared to pure GPE, the asymmetric polymer electrolytes exhibit significantly enhanced mechanical strength from 4.4 MPa to 7.4 MPa, effectively suppressing lithium dendrite growth. Furthermore, the HGPE improves interfacial compatibility with the anodes by preventing direct contact between GPE and lithium metals. The addition of h-BN also enhances the lithium-ion transfer number (t Li+ ), reaching 0.87 compared to 0.53 for pure GPE, attributed to the hindrance of anion movement by the protective layer. Consequently, the Li symmetric battery assembled with HGPE demonstrate exceptional long-term stability, maintaining performance over 1600 h at 0.1 mA cm −2 . Furthermore, the assembled Li|LiFePO 4 battery can deliver a high-capacity retention rate of 93.8 % after 500 cycles at room temperature, showcasing the promising potential of asymmetric polymer electrolytes for high-performance LMBs.
研究领域:
材料科学
·
电化学
·
能源存储
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DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2025
·
IF 4.9
Jiandong Hao,Ling Li,Tingwei Yan,Jinchang Meng,Zhenxing Liu
Boron nitride (BN) is suitable for ultraviolet (UV) photodetection with its wide bandgap and high absorption coefficient. The research on fabrication process and performance optimization is urgent with the development of UV detection technology. In this work, the band structure, work function, charge distribution and transfer, and optical absorption coefficients of BN/Au and BN/Al interfaces are calculated based on the density functional theory. The results show that the BN monolayer gets more charges with the influence of Au. The charge transfer is 0.025e and 0.015e for BN/Au and BN/Al. The absorption coefficients of BN/Au is higher than that of BN/Al in the DUV region, which enhances the light absorption of BN. In addition, BN/Au and BN/Al DUV detector is fabricated by dry transfer method. The highest photo-dark current ratio (PDCR) of 115.04 and 29.09 are obtained for BN/Au and BN/Al at an optical power density of 1.21 mW/cm 2 ( V bias =10 V). The responsivity (R) and detectivity (D*) is up to 0.70μA/W and 1.55 × 10 8 Jones for the BN/Au. The rise and fall times (T r /T f ) are 0.12 s and 0.11 s, respectively. The DUV detector is fabricated with easy process, low cost and fast response. This provides theoretical support and technical reference for the next generation of high-performance devices.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
Electronic Materials Letters
·
2022
·Vol. 19
·期 2
·201-211
·
IF 3.151
Zhang Yanting,Cai Cheng,Chen Tao,Wu Chonggang,Gong Xinghou,Hong Jiang,Hu Tao
As microelectronics technology advances and develops, issues such as heat management and reliability of electronic components will become more exposed. Here, this paper explored a green biomass modification method for preparing composites with both good thermal conductivity and dielectric properties. Namely, boron nitride (BN) was first surface coated with the copolymerization product of tea polyphenols and theophylline, both of which can be extracted from tea leaves. Then, through solution blending the coated-BN (BN@TPP) with silicone rubber (SR), the BN@TPP/SR composites were obtained. Owing probably to the coated layer, BN@TPP were more evenly dispersed within the SR matrix, which effectively reduced the interfacial thermal resistance and improved the thermal conductivity of composites. The thermal diffusion coefficient and thermal conductivity of 40 wt% BN@TPP/SR composites reached 0.216 mm 2 /s and 0.462 W/mK, which are higher than BN/SR composites (0.155 mm 2 /s, 0.349 W/mK), respectively. Meanwhile, the 40 wt% BN@TPP/SR composite maintained dielectric constant (3.9 at 1 kHz) and low dielectric loss (0.005 at 1 kHz). In conclusion, this green biomass modification method not only provides a simple and environmentally friendly modification method for BN, but also offers a novel idea that can be applied to the practical preparation of thermally conductive materials for electronic devices. Graphical Abstract
研究领域:
材料科学
·
绿色化学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·Vol. 49
·期 14
·23538-23545
·
IF 5.2
Jianbo Zhu,Jing Lin,Chao Yu,Yi Fang,Zhenya Liu,Zhonglu Guo,Chengchun Tang,Yang Huang
Boron nitride (BN) aerogels is a class of three-dimensional (3D) hierarchical network structure assembled from BN micro/nanostructures. The construction of BN/BN composite aerogel by introducing of BN micro/nano-structural units into the 3D BN aerogel scaffold provides an effective strategy for obtaining BN aerogel with improved all-round properties. Here, a novel kind of BN/BN composite aerogels has been developed by vacuum impregnation of ammonia borane (AB) into fiber-based BN aerogels, followed by high-temperature pyrolysis . The introducing of AB into BN aerogels makes the formation of unique AB/BN composite aerogels, and the high-temperature decomposition of AB results in the obtaining of a series of multifunctional composites, i.e. BN/BN composite aerogels. As compared with the porous BN microfibers in original BN aerogel, the self-assembled fibers in BN/BN composite aerogel are densely covered with high crystalline BN nanoflakes, which are generated by the AB decomposition. The obtained BN/BN composite aerogels have shown excellent thermal stability, significantly improved hydrophobic effect and heat transfer capability. This work provides a new idea for the future research and development of BN composite aerogels.
研究领域:
材料科学
·
纳米材料
·
热功能材料
·
多孔材料
·
复合材料
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2022
·Vol. 43
·期 6
·3846-3857
·
IF 3.531
Wenhao Luo,Jinling Zeng,Yanrong Chen,Wenbin Dai,Yingbang Yao,Bing Luo,Fuzeng Zhang,Tingting Wang
Hexagonal boron nitride (h-BN) micro-platelets were surface-functionalized by sulfuric acid (SA). Such modified h-BN powders were mixed with thermoplastic polyether imide (PEI) to prepare flexible composite films using a solution casting method. After surface modification, the h-BN powders were uniformly dispersed in the PEI matrix. The thermal conductivity of the flexible composite materials was significantly improved, with a 60% increase over that of pure PEI. The mechanical properties of the composites were also measured and discussed. The Young's modulus of the h-BN/PEI composites was increased from 1.15 GPa for pure PEI to 1.62 GPa for the h-BN/PEI composite with a filling ratio 10 vol%. As compared to pure PEI film, the electrical breakdown strength of the composites with 5 vol% h-BN increased from 45.3 to 55.3 kV/mm. Our results show that the surface-modified h-BN filler is effective in improving the thermal conductivity and insulation performance of PEI-based composites.
研究领域:
材料科学
·
热管理材料
·
高分子复合材料
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 28
·9714-9720
·
IF 4
Sirui Liu,Yuxin Shi,Lingling Xu,Weican Zhan,Meixi Chen,Xiaoyue Pan,Yuqing Yao,Jiajie Cai,Mingyi Zhang,Xinzhi Ma
Designing an excellent OER catalyst in an alkaline environment is severe yet essential for industrial H2 application under the electrochemical technique. This study has achieved multiple modifications on CoN nanowires, the classic OER catalyst, via a facile room-temperature NaBH4 spontaneous hydrolysis. This facile process simultaneously generates oxygen vacancies and robust BN species. It wraps hydrophilic BOx motifs on the OER response CoN nanowires, producing OER active Co–N–B species, increasing active numbers and guaranteeing structural stability. It suggests that a low NaBH4 concentration (0.1 mol L−1) treatment endows CoNNWAs/CC with excellent OER performance and robust structure, which can drive a current density of 50 mA cm−2 with only 325 mV overpotentials with more than 24 hours’ durability. Even, the catalyst can drive 1000 mA cm−2 around 480 mV overpotential. This study allows a novel strategy for designing high-performance OER catalysts.
研究领域:
材料科学
·
电化学
·
催化反应
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）