MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2025
·
IF 7
Yunwei Shi,Qianglong He,Aiyang Wang,Hao Wang,Weimin Wang,Zhengyi Fu
Textured Si 3 N 4 /BN composite ceramics are prepared via combination of PHIP sintering and gas pressure sintering. The mechanical properties of composite ceramics gradually decrease with the increase of BN content. However, the bimodal texture of Si 3 N 4 /BN composite ceramics exhibits a synergistic effect on the anisotropy of thermal and mechanical properties. When the BN content is 20 vol%, The anisotropy of fracture toughness along different testing direction reaches 51.0 %. By the proper regulation of the bimodal texture, Si 3 N 4 /BN composite ceramics could simply realize a high thermal conductivity (99.2 W m −1 k −1 ) and thermal anisotropy (2.1) at low sintering temperature (1800 °C) for short preparation period (4 h). This bimodal texture breaks through the inhibition of the high thermal conductivity of Si 3 N 4 -based ceramics by the amorphous phase of low thermal conductivities. Thus, this new material designs have great advantages in large-scale preparation and directional heat dissipation in the next-generation electric devices.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Microbiology
·
2025
·
IF 4.5
Tongshu Liu,Yanli Zheng,Litao Wang,Xu Wang,Haiyan Wang,Yongqiang Tian
Introduction: Surfactins, a class of lipopeptide biosurfactants secreted by plant growth-promoting rhizobacteria (PGPR), have garnered significant attention due to their dual functionality in promoting plant growth and controlling plant diseases. Their potential as biopesticides is underscored by their unique physicochemical properties and biological activities. However, the practical application of surfactin is currently limited by its low yield in natural strains.Methods: This study aimed to optimize the culture conditions for Bacillus velezensis BN, a strain with exceptional biocontrol properties, to enhance its surfactin yield. Critical factors, including nitrogen sources and amino acid supplementation, were systematically investigated to determine their impact on surfactin production.Results: The study revealed that nitrogen sources and amino acid supplementation were pivotal factors influencing surfactin yield. Compared to the baseline, these factors resulted in a remarkable 5.94-fold increase in surfactin production. Furthermore, a positive correlation was established between surfactin yield and biocontrol efficacy. Enhanced surfactin yield was associated with improved antifungal activity, biofilm formation, and rhizosphere colonization capacity of B. velezensis BN on potato plantlets.Discussion: These findings provide novel insights into the practical application of surfactin and establish a scientific foundation for the development of innovative and eco-friendly antifungal agents suitable for agricultural use. The results demonstrate that optimizing culture conditions can significantly enhance surfactin yield and biocontrol efficacy, thereby highlighting the potential for sustainable agricultural practices.
研究领域:
微生物学
·
农业科学
·
植物病理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 12
·8293-8302
·
IF 3.9
Yanchun Tong,Chunmiao Liu,Chang Liu,Haibin Sun,Yurun Feng,Qiangqiang Hu,Hongying Zhang,Yujun Zhao,Xue Guo,Shigang Wu
In this paper, the SiCN(Ni)/BN ceramic with excellent electromagnetic wave (EMW) absorption performance was successfully prepared. The Ni and Ni3Si were in situ formed by the introduction of nickel acetylacetonate (NA), which effectively improved the impedance matching performance of SiCN(Ni)/BN ceramics. The EMW absorption properties of the SiCN(Ni)/BN ceramics showed a trend of first increasing and then decreasing with the increase in content of NA. When the NA content reached 7 wt%, the impedance matching range of SiCN-7 was optimal. The minimum reflection loss (RLmin) of SiCN-7 reached −53.47 dB at 4.2 mm and the effective absorption bandwidth (EAB) was 2.32 GHz at 3.48 mm. Through the analysis of electrical conductivity, it was found that the proportion of polarization loss in dielectric loss was more than 99%. It is worth noting that the radar cross section (RCS) value of SiCN-7 absorber was lower than that of the perfect electrical conductor (PEC) plate in the range of −90–90°, and showed a larger coverage angle, indicating that it possessed a good practical application prospect in the field of electromagnetic wave absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Optical Materials
·
2024
·
IF 0
Lei Jin,Shuting Liu,Haoran Zhang,Wei Li,Jianle Zhuang,Chaofan Hu,Yingliang Liu,Mingtao Zheng,Xuejie Zhang,Bingfu Lei
The development of laser-driven lighting is progressing toward achieving high-power and high-brightness capabilities. However, all-inorganic color converters still face significant challenges arising from heat accumulation. Herein, we propose an effective approach to enhance the thermal conductivity of the light converter by closely sintering Y3Al5O12:Ce3+ (YAG:Ce3+) phosphor-glass films on a highly thermally conductive BN substrate (abbreviated as PBNC) for localized heat dissipation. This results in a significant increase in the luminescence saturation threshold when exposed to blue laser irradiation. The laser bearing capacity of PBNC is effectively optimized by adjusting the ratio of phosphor to glass and the thickness of the BN substrate. Under a laser irradiation level of 4.47 W/mm2 for 3 min, the maximum surface temperature of the PBNC is 92 °C, representing a significant reduction of 44 °C compared to that of the phosphor-glass film on the AlN substrate (136 °C). A laser-driven lighting device employing a PBNC with a thickness of 2.5 mm gives a luminous flux of 590.4 lm and luminous efficacy of 173.6 lm/W under a laser power density of 5.07 W/mm2. These findings confirm that the BN substrate enhances the thermal conductivity of phosphor-glass films, enabling them to become highly promising color converters for laser-driven lighting.
研究领域:
光学工程
·
材料科学
·
照明技术
✓ 已验证
DOI
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Wei Li,Xiao Wang,Qiong Ma,Fei Wang,Xiao-shan Chu,Xue-chuan Wang,Chuan-yi Wang
Solar light driven hydrogen evolution is a prospective strategy to solve the energy problem. However, the poor photoresponse, low photocurrent density and easy electron-hole recombination remarkably restrict the HER activity of the conventional photocatalyst. Herein, we constructed a CdS@hexagonal boron nitride (h-BN) heterostructure on reduced graphene oxide (rGO) to synthesize a ternary CdS@h-BN/rGO catalyst via a structural reconstruction strategy. The CdS@h-BN heterointerface promoted the electrons transferring to the CdS active centers from the valence band of h-BN under photoinduction, overcoming the wide bandgap defect of pristine h-BN. The easily photoexcited property of CdS cocatalyst resulted in superhigh photocurrent density (2.7·μA cm −2 ) under simulated solar light, which was 3.3-fold greater of pristine CdS NPs. Meanwhile, the interfacial interactions of three components remarkably restrained the carriers recombination. Hence, the resultant ternary hybrid catalyst presented remarkably improved photoresponse and interfacial conductivity, thereby the optimal catalyst represented remarkably enhanced HER activity (6465.33 μmol h −1 g −1 ) under simulated solar light, which was about 10.9-fold greater of the pristine CdS NPs and 218.3-fold greater of the optimal h-BN/rGO hybrid. About 19.8 % of apparent quantum yield was achieved under illumination of λ =420 nm, and the excellent regenerability and durability were represented during six cycles and 20 h of continued illumination. Thereby, this study provides a prospective idea for constructing low-cost nonprecious metal based photocatalyst with highly efficient HER performance.
研究领域:
材料科学
·
能源科学
·
光催化技术
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Xiangyue Wei,Yixin Pan,Jisheng Kou,Rui Huang
The removal of selenium (IV) from aqueous solutions was the focus of research that led to the discovery of a novel type of composite adsorbent called FeS@h-BN nanocomposite . This adsorbent was studied, characterized, and put to use in a fixed bed column. SEM, FTIR, XRD, and XPS analyses were conducted to learn more about the coated layer's surface properties. The effect of several adsorbent materials on the remediation of Se(IV) in dynamic water was examined. The Adams-Bohart model, the Thomas model, and the Yoon-Nelson model were all utilized to get optimal fits to the kinetic data obtained from the adsorption process. Moreover, the Adams-Bohart model was only applicable to the beginning portion of the dynamic behavior of the FeS and FeS@h-BN columns. The Thomas and Yoon-Nelson models were sufficient for describing the breakthrough curve under all experimental conditions. For this dynamic process, the theoretical breakthrough curve profile was compared to an experimentally derived profile. It was discovered that FeS@h-BN nanocomposites are the most effective at removing Se(IV), and the adsorption of Se(IV) by a variety of adsorbent materials is enough for all three dynamic models.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Zhao Du,Huayi Cai,Zhonglu Guo,Zhiyuan Zhao,Jing Lin,Yang Huang,Chengchun Tang,Guifeng Chen,Yi Fang
Herein, a series of novel Ti 3 C 2 T x /p-BN heterojunctions with excellent photocatalytic activity have been prepared by combining one-dimensional (1D) porous BN fibers (p-BN) with high aspect ratio and two-dimensional (2D) ultrathin Ti 3 C 2 T x MXenes for photocatalytic conversion of CO 2 -to-CO. Our results show that the optimized photocatalyst can photo-reduce CO 2 to generate CO under UV light with CO yield of 22.53 μmol g −1 h −1 , which is 4.3 and 20.1 times of p-BN (5.23 μmol g −1 h −1 ) and Ti 3 C 2 T x (1.23 μmol g −1 h −1 ), respectively. We demonstrate that the Ti 3 C 2 T x /p-BN heterojunction can combine the efficient CO 2 adsorption of porous p-BN and excellent electronic conductivity of Ti 3 C 2 T x . Moreover, the interfacial Ti-O-B bonds lead to strong interaction between p-BN and Ti 3 C 2 T x , resulting in the formation of Schottky heterojunction. The synergistic effect not only enables the adsorption of CO 2 by Ti 3 C 2 T x /p-BN heterojunction higher than p-BN, but also accelerates the transfer and separation of photogenerated carriers in p-BN, which finally exhibits promoted CO 2 photocatalytic activity. The present work pioneer the application of Ti 3 C 2 T x /p-BN heterojunction in photocatalytic CO 2 reduction and further guides the design of noble-metal-free photocatalysts.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2014
·
IF 2.269
Zibin Guo,Zhe Liu,Li Ye,Kaikai Ge,Tong Zhao
Lignin-phenol-formaldehyde resin (LPF) derived submicron carbon fibers were successfully prepared by using LPF which was synthesized by using lignin as partial substitution of phenol in phenol-formaldehyde resin as precursor. The carbon fibers were obtained through electrospinning the LPF/polyvinylpyrrolidone (PVP)/dimethylformamide (DMF) solution followed by successive stabilization with BN preceramic polymer and carbonization processes. The chemical structure of LPF resin was studied by Fourier transform infrared spectroscopy (FTIR) and the morphology properties of carbon fibers were studied by scanning electron microscopy (SEM). The results showed that stabilized by immerging in BN precursor solution and then stabilized at 250 °C in the air, the morphology generated during the electrospinning processing was successfully retained throughout the stabilization and carbonization processes. LPF derived carbon fibers exhibited homogeneous diameter distribution and smooth surface.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Mao chen,Fan Zhang,Hailong Wang,Gang Shao,Bingbing Fan,Rui Zhang,Hongxia Li,Yongqiang Chen
The dense h-BN/ZrO 2 (30 wt%) composites without additives were rapidly fabricated by spark plasma sintering . The relative density, apparent porosity, fracture toughness, flexural strength , phase composition and microstructure of h-BN/ZrO 2 composites were systematically investigated. Besides, the corrosion resistance of h-BN/ZrO 2 composites in molten steel was also studied in detail. Especially, the h-BN/ZrO 2 composites were sintered at 1800 °C exhibiting a relative density of 96.6% and the flexural strength of ≈ 157 MPa. The corrosion of h-BN/ZrO 2 composites was mainly due to the oxidative decomposition of BN, and the corrosion process was clarified by a parabolic law. The excellent corrosion resistance of the h-BN/ZrO 2 composites was attributed to ZrO 2 residual layer formed at the interface. The corrosion thickness of h-BN/ZrO 2 composites was only ∼116 µm even using the longest corrosion time (80 min). The composites could be a promising candidate material applied to fabricated thin strip continuous casting side sealing plates.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2023
·
IF 17.1
Yingying Niu,Xin Zhou,Wei Gao,Maixia Fu,Yule Duan,Jiandong Yao,Bing Wang,Mengmeng Yang,Zhaoqiang Zheng,Jingbo Li
Driven by the rapid development of autonomous vehicles, ultrasensitive photodetectors with high signal-to-noise ratio and ultraweak light detection capability are urgently needed. Due to its intriguing attributes, the emerging van der Waals material, indium selenide (In2Se3), has attracted extensive attention as an ultrasensitive photoactive material. However, the lack of an effective photoconductive gain mechanism in individual In2Se3 inhibits its further application. Herein, we propose a heterostructure photodetector consisting of an In2Se3 photoactive channel, a hexagonal boron nitride (h-BN) passivation layer, and a CsPb(Br/I)3 quantum dot gain layer. This device manifests a signal-to-noise ratio of 2 × 106 with responsivity of 2994 A/W and detectivity of 4.3 × 1014 Jones. Especially, it enables the detection of weak light as low as 0.03 μW/cm2. These performance characteristics are ascribed to the interfacial engineering. In2Se3 and CsPb(Br/I)3 with type-II band alignment promote the separation of photocarriers, while h-BN passivates the impurities on CsPb(Br/I)3 and promises a high-quality carrier transport interface. Furthermore, this device is successfully integrated into an automatic obstacle avoidance system, demonstrating promising application prospects in autonomous vehicles.
研究领域:
材料科学
·
电子工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
High Voltage
·
2025
·Vol. 10
·期 1
·219-227
·
IF 4.9
Zeyu You,Ling Weng,Lizhu Guan,Xiaorui Zhang,Zijian Wu,Hao Chen,Wei Zhao
Epoxy resin (EP), as a resin material with excellent insulation performance, has been widely applied in fields such as electronics, coatings, ships etc. However, epoxy resins generally have poor thermal conductivity, which limits their application in the field of new generation of electronic packaging. To address the key issues mentioned above, the BN@Fe 3 O 4 particles with positive out-of-plane thermal conductivity were successfully prepared in this study, having a core-shell structure with rough surfaces as well. As a thermal conductive powder, the disadvantage of hexagonal boron nitride being easily agglomerated in resin has been improved. By applying an external magnetic field, three-dimensional thermal conduction pathways were constructed in the matrix. The physical and chemical properties of the BN@Fe 3 O 4 powder and its composite materials were analysed and tested. The experiment indicates that the thermal conductive magnetic powder BN@Fe 3 O 4 had been successfully prepared. When the filling amount of BN@Fe 3 O 4 reached 27.5 vol%, the out-of-plane thermal conductivity of the composite material was 1.758 W m −1 K −1 , which was 982.12% that of pure EP. At this point, the mechanical behaviour and insulation performance of EP composite materials can be effectively guaranteed at the same order of magnitude as pure EP performance.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 20
·6752
·
IF 3.4
Weidong Zhang,Haoliang Wen,Yaping Gou,Yun Zhao,Zhiqiang Zhang,Yali Qiao
The challenge of developing a high-efficiency microwave absorbent remains, because of the compatibility between microwave absorption and high-temperature-resistant performance in practical application. Herein, a facile method is used to obtain serial MXene/BN-zxy composites, where zx:y indicates the weight ratio of MXene and boron nitride (BN) in the composites, with adjustable microwave absorption performance (MAP) which can be regulated by the ratio of MXene and the BN nanosheet. In particular, the as-prepared absorbents with supercapacitance-like structure significantly enhanced the MAP and could be served more than 900 °C. The results of MAP reveal that the minimum reflection loss (RL) can reach −20.94 dB with a MXene/BN-101 composite coating thickness of 4.0 mm; the effective attenuation bandwidth (RL< −10 dB, i.e., 90% microwave energy is attenuated) is up to 9.71 GHz (7.94–17.65 GHz). From a detailed analysis, it is observed that attenuation is the critical limiting factor for MAPs rather than impedance mismatch, which can be assigned to the poor MAP of BN nanosheets. In any case, as-prepared absorbents have potential applications in the field of heating components.
研究领域:
材料科学
·
电磁材料
·
复合材料
·
微波工程
✓ 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）