Metal-organic frameworks (MOFs) have been widely applied in the field of electromagnetic wave absorption (EMWA) on account of unique morphology, simple fabrication, and ultra-high porosity. Nevertheless, the facile method of protecting its structure from being destroyed remains challenging. Herein, we proposed a hydrothermal method combined with a carbonization strategy to construct the 0D/1D/2D Fe3C@NC@Mo2C/Fe3C composites. Owing to the incorporation of polydopamine (PDA), the carbon shell formed during high-temperature carbonization effectively protected the original MIL-88A rod-like structure, and the 2D Mo2C nano-sheets and 1D Fe3C nanoparticles were coated on the surface of 1D Fe3C nanorods. With the increase in carbonization temperature, the EMWA properties of the composites presented a trend of first increasing and then decreasing. Impressively, the composites (at 750 °C) exhibited praiseworthy EMWA performances with a minimum reflection loss value of −43.70 dB at 8.00 GHz, alongside a maximum effective absorption bandwidth of 6.08 GHz (11.20–17.28 GHz). Density functional theory calculations confirmed the distinctive charge distribution resulting from the heterointerface, which is beneficial to the polarization loss and conductive loss. As a result, the outstanding EMWA performance was credited to the distinctive hierarchical structure, appropriate impedance matching, numerous heterogeneous interfaces, and magnetic loss. Moreover, Radar cross-section calculations indicated that the composites have tremendous potential for practical application. Thus, this work may pave new avenues for designing high-performance and structure-controllable absorbing materials.
{"title":"Morphology engineering of MIL-88A-derived 0D/1D/2D nanocomposites toward wideband microwave absorption","authors":"Jie Mei, Juhua Luo, Tianyi Zhao, Shenyu Jiang, Yuhan Wu, Ziyang Dai, Yu Xie","doi":"10.1016/j.jmst.2024.12.012","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.12.012","url":null,"abstract":"Metal-organic frameworks (MOFs) have been widely applied in the field of electromagnetic wave absorption (EMWA) on account of unique morphology, simple fabrication, and ultra-high porosity. Nevertheless, the facile method of protecting its structure from being destroyed remains challenging. Herein, we proposed a hydrothermal method combined with a carbonization strategy to construct the 0D/1D/2D Fe<sub>3</sub>C@NC@Mo<sub>2</sub>C/Fe<sub>3</sub>C composites. Owing to the incorporation of polydopamine (PDA), the carbon shell formed during high-temperature carbonization effectively protected the original MIL-88A rod-like structure, and the 2D Mo<sub>2</sub>C nano-sheets and 1D Fe<sub>3</sub>C nanoparticles were coated on the surface of 1D Fe<sub>3</sub>C nanorods. With the increase in carbonization temperature, the EMWA properties of the composites presented a trend of first increasing and then decreasing. Impressively, the composites (at 750 °C) exhibited praiseworthy EMWA performances with a minimum reflection loss value of −43.70 dB at 8.00 GHz, alongside a maximum effective absorption bandwidth of 6.08 GHz (11.20–17.28 GHz). Density functional theory calculations confirmed the distinctive charge distribution resulting from the heterointerface, which is beneficial to the polarization loss and conductive loss. As a result, the outstanding EMWA performance was credited to the distinctive hierarchical structure, appropriate impedance matching, numerous heterogeneous interfaces, and magnetic loss. Moreover, Radar cross-section calculations indicated that the composites have tremendous potential for practical application. Thus, this work may pave new avenues for designing high-performance and structure-controllable absorbing materials.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"62 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142886807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fluorescence-based corrosion detection is an emerging method for surveillance in the early stages of metal corrosion. It is valued for its great responsiveness, non-invasive nature, and capability of in-situ and simultaneous detection. This review paper presents a thorough and up-to-date review of fluorescence-based methods for detecting metal corrosion. It introduces the underlying principles of these detection methods, aligned with the corrosion processes of metals. The paper categorizes fluorescent indicators into those sensitive to pH changes and those responsive to metal ions, both serving as early indicators of corrosion. It also discusses the factors influencing the sensitivity of fluorescence detection and various methods of incorporating fluorescent indicators. Lastly, the paper outlines critical future directions for the betterment of fluorescence-based corrosion diagnosis.
{"title":"A review of advancement in fluorescence-based corrosion detection for metals and future prospects","authors":"Sharjeel Ahmed, Hongwei Shi, Mustehsin Ali, Imran Ali, Fuchun Liu, En-Hou Han","doi":"10.1016/j.jmst.2024.12.009","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.12.009","url":null,"abstract":"Fluorescence-based corrosion detection is an emerging method for surveillance in the early stages of metal corrosion. It is valued for its great responsiveness, non-invasive nature, and capability of in-situ and simultaneous detection. This review paper presents a thorough and up-to-date review of fluorescence-based methods for detecting metal corrosion. It introduces the underlying principles of these detection methods, aligned with the corrosion processes of metals. The paper categorizes fluorescent indicators into those sensitive to pH changes and those responsive to metal ions, both serving as early indicators of corrosion. It also discusses the factors influencing the sensitivity of fluorescence detection and various methods of incorporating fluorescent indicators. Lastly, the paper outlines critical future directions for the betterment of fluorescence-based corrosion diagnosis.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"12 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142886806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Advancement of Co-N-C materials for efficient oxygen reduction reaction (ORR) is essential, given their potential as highly attractive alternatives to Pt-based catalysts. Here, we propose a novel strategy for the controllable evolution of active Co sites via constructing a carbon substrate to fabricate a high-performance Co-N-C catalyst for ORR, which involves initiating a metallic Co phase adjacent to atomic Co sites to modify the electronic structures and promote synergistic effects. The resulting catalyst (C-SDB-Co) demonstrates exceptional ORR activity (E1/2=0.95 V vs. RHE) and zinc-air battery capability surpassing the benchmark catalysts in alkaline solutions. As evidenced by density functional theory (DFT) calculations, the remarkable ORR performance of C-SDB-Co originates from the synergy between the two Co phases that effectively regulates the electronic structure and lowers the energy barrier of intermediate adsorption. This study provides a new perspective on enhancing the catalytic activity of Co-N-C materials through innovative carbon substrate design and active site regulation.
考虑到Co-N-C材料作为pt基催化剂的极具吸引力的替代品的潜力，用于高效氧还原反应（ORR）的进展是必不可少的。在此，我们提出了一种新的策略，通过构建碳衬底来制造高性能的Co- n - c催化剂来实现活性Co位的可控演化，该策略涉及在原子Co位附近引发金属Co相来修饰电子结构并促进协同效应。该催化剂（C-SDB-Co）表现出优异的ORR活性（E1/2=0.95 V vs. RHE）和锌-空气电池性能，在碱性溶液中优于基准催化剂。密度泛函理论（DFT）计算表明，C-SDB-Co显著的ORR性能源于两Co相之间的协同作用，有效调节了电子结构，降低了中间吸附的能垒。本研究为通过创新碳衬底设计和活性位点调控来提高Co-N-C材料的催化活性提供了新的视角。
{"title":"Phase-controlled evolution of cobalt active sites assisted by carbon substrate for high-efficiency oxygen reduction reaction","authors":"Lili Fan, Xiaojie Dai, Fengting Li, Xuting Li, Zhanning Liu, Qingmeng Guo, Chongxi Zhang, Zixi Kang, Daofeng Sun","doi":"10.1016/j.jmst.2024.11.044","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.044","url":null,"abstract":"Advancement of Co-N-C materials for efficient oxygen reduction reaction (ORR) is essential, given their potential as highly attractive alternatives to Pt-based catalysts. Here, we propose a novel strategy for the controllable evolution of active Co sites via constructing a carbon substrate to fabricate a high-performance Co-N-C catalyst for ORR, which involves initiating a metallic Co phase adjacent to atomic Co sites to modify the electronic structures and promote synergistic effects. The resulting catalyst (C-SDB-Co) demonstrates exceptional ORR activity (<em>E</em><sub>1/2</sub>=0.95 V vs. RHE) and zinc-air battery capability surpassing the benchmark catalysts in alkaline solutions. As evidenced by density functional theory (DFT) calculations, the remarkable ORR performance of C-SDB-Co originates from the synergy between the two Co phases that effectively regulates the electronic structure and lowers the energy barrier of intermediate adsorption. This study provides a new perspective on enhancing the catalytic activity of Co-N-C materials through innovative carbon substrate design and active site regulation.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"5 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142887916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-26DOI: 10.1016/j.jmst.2024.12.010
Dongxiao Wen, Nan Wang, Jiahe Peng, Tetsuro Majima, Jizhou Jiang
Cu metal and its oxides have attracted much attention for photocatalytic CO2 reduction reaction (CO2RR), but the stability and effects of Cu oxidation states on CO2RR are not fully understood. Cux+/Cu0-loaded graphitic carbon nitride (g-C3N4) heterojunctions (Cu-CuOx/g-C3N4) are fabricated via a stepwise calcination method for efficient photocatalytic CO2RR. Cu2O is the main component of Cu-CuOx and the mixed valence Cu includes Cu0, Cu+, and Cu2+, which play the role of charge trapping sites and redox catalytic centers during the photocatalytic CO2RR process. The main products were CO and CH4 for the CO2RR with production rates of 14.45 and 0.66 μmol g−1 h−1 for CO and CH4, which were higher than those for g-C3N4 and Cu-CuOx, respectively. This photocatalytic CO2RR performance is attributed to the ultrafast switching of “Cux+−Cu0” and eCB−/hVB+ trapping transformation in Cu-CuOx benefited from the built-in IEF between Cu-CuOx and g-C3N4, increasing the efficient photogenerated eCB−, and enabling the stability of Cu-CuOx/g-C3N4. Cux+ adsorbed by H2O works as the electron trapping site to change to Cu0 and switch to the hole trapping site; Cu0 works as the hole trapping site to change to Cux+ and switch to the electron trapping site, causing the CO2RR of the adsorbed CO2. Moreover, the coordinated Cu0 and Cu+ species facilitate the activation of the adsorbed CO2 and *CO generation, these adsorbed *CO on Cu0 and Cu+ detected by in-situ DRIFTS quickly transformed to *CHO with a lower energy barrier benefited from the mixed Cu0/Cu+ active sites during CORR to produce CH4. This finding provides a new insight into the influence of mixed valence Cu during photocatalytic CO2RR.
{"title":"Unique Cux+/Cu0 active-site switches in Cu-loaded g-C3N4 nanosheets for efficient photocatalytic CO2 reduction","authors":"Dongxiao Wen, Nan Wang, Jiahe Peng, Tetsuro Majima, Jizhou Jiang","doi":"10.1016/j.jmst.2024.12.010","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.12.010","url":null,"abstract":"Cu metal and its oxides have attracted much attention for photocatalytic CO<sub>2</sub> reduction reaction (CO<sub>2</sub>RR), but the stability and effects of Cu oxidation states on CO<sub>2</sub>RR are not fully understood. Cu<em><sup>x</sup></em><sup>+</sup>/Cu<sup>0</sup>-loaded graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) heterojunctions (Cu-CuO<em><sub>x</sub></em>/g-C<sub>3</sub>N<sub>4</sub>) are fabricated via a stepwise calcination method for efficient photocatalytic CO<sub>2</sub>RR. Cu<sub>2</sub>O is the main component of Cu-CuO<em><sub>x</sub></em> and the mixed valence Cu includes Cu<sup>0</sup>, Cu<sup>+</sup>, and Cu<sup>2+</sup>, which play the role of charge trapping sites and redox catalytic centers during the photocatalytic CO<sub>2</sub>RR process. The main products were CO and CH<sub>4</sub> for the CO<sub>2</sub>RR with production rates of 14.45 and 0.66 μmol g<sup>−1</sup> h<sup>−1</sup> for CO and CH<sub>4</sub>, which were higher than those for g-C<sub>3</sub>N<sub>4</sub> and Cu-CuO<em><sub>x</sub></em>, respectively. This photocatalytic CO<sub>2</sub>RR performance is attributed to the ultrafast switching of “Cu<em><sup>x</sup></em><sup>+</sup>−Cu<sup>0</sup>” and e<sub>CB</sub><sup>−</sup>/h<sub>VB</sub><sup>+</sup> trapping transformation in Cu-CuO<em><sub>x</sub></em> benefited from the built-in IEF between Cu-CuO<em><sub>x</sub></em> and g-C<sub>3</sub>N<sub>4</sub>, increasing the efficient photogenerated e<sub>CB</sub><sup>−</sup>, and enabling the stability of Cu-CuO<em><sub>x</sub></em>/g-C<sub>3</sub>N<sub>4</sub>. Cu<em><sup>x</sup></em><sup>+</sup> adsorbed by H<sub>2</sub>O works as the electron trapping site to change to Cu<sup>0</sup> and switch to the hole trapping site; Cu<sup>0</sup> works as the hole trapping site to change to Cu<em><sup>x</sup></em><sup>+</sup> and switch to the electron trapping site, causing the CO<sub>2</sub>RR of the adsorbed CO<sub>2</sub>. Moreover, the coordinated Cu<sup>0</sup> and Cu<sup>+</sup> species facilitate the activation of the adsorbed CO<sub>2</sub> and *CO generation, these adsorbed *CO on Cu<sup>0</sup> and Cu<sup>+</sup> detected by in-situ DRIFTS quickly transformed to *CHO with a lower energy barrier benefited from the mixed Cu<sup>0</sup>/Cu<sup>+</sup> active sites during CORR to produce CH<sub>4</sub>. This finding provides a new insight into the influence of mixed valence Cu during photocatalytic CO<sub>2</sub>RR.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"1 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142886998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this work, silicon-carbon hybrid materials were adopted as an example to illustrate the novel strategy to in situ construct heterostructure with adjustable microstructure. Based on the temperature-dependent thermodynamics and kinetics of reaction between Si and C, the processes for Si nanocrystals growth and C decoration were coupled at different zones of plasma flame according to its temperature and velocity fields by theoretical modeling, aiming to intentionally suppress the formation of undesirable carbide, and enable adjusting the microstructure of each counterpart separately in transient process. As a result, well-controlled Si/C nanocomposites, including nanospheres and nanowires with core-shell structures, were achieved, and this continuous and in-flight route is also potential for large-scale production. Further investigation on the electrochemical properties highlights the advantage of as proposed strategy to efficiently construct heterostructures with superior performance for various applications.
{"title":"In situ constructing heterostructure by synergizing the reaction thermodynamics and kinetics in thermal plasma: a case of silicon-carbon hybrid material","authors":"Xinyu Gong, Qinqin Zhou, Xiao Han, Yongfeng Cai, Yunfei Yang, Peng Hu, Jinshu Wang","doi":"10.1016/j.jmst.2024.11.042","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.042","url":null,"abstract":"In this work, silicon-carbon hybrid materials were adopted as an example to illustrate the novel strategy to in situ construct heterostructure with adjustable microstructure. Based on the temperature-dependent thermodynamics and kinetics of reaction between Si and C, the processes for Si nanocrystals growth and C decoration were coupled at different zones of plasma flame according to its temperature and velocity fields by theoretical modeling, aiming to intentionally suppress the formation of undesirable carbide, and enable adjusting the microstructure of each counterpart separately in transient process. As a result, well-controlled Si/C nanocomposites, including nanospheres and nanowires with core-shell structures, were achieved, and this continuous and in-flight route is also potential for large-scale production. Further investigation on the electrochemical properties highlights the advantage of as proposed strategy to efficiently construct heterostructures with superior performance for various applications.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"132 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142884110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-24DOI: 10.1016/j.jmst.2024.11.033
Lang Liu, Jiazhen He, Liejun Li, Zhiyuan Liang, Zhengwu Peng, Jixiang Gao, Mingxin Huang, Zhichao Luo
The low damage resistance and fracture toughness hinder the widespread application of ultrahigh-strength dual phase (DP) steels. In this work, we propose a novel strategy to improve the fracture toughness of ultrahigh-strength DP steels by an order of magnitude without sacrificing the tensile strength. Six ultrahigh-strength DP steels with varying microstructure but comparable tensile strength (>1400 MPa) were prepared via tailoring the heat treatment process after cold rolling. Additionally, finite element (FE) method incorporated with Gurson-Tvergaad-Needleman (GTN) model and cohesive zone model (CZM) is established to simulate the fracture behaviour of DP steel. Twelve model DP steels with different ferrite sizes and F/M strength differences are constructed. The combined experiment and simulation results demonstrate that (i) ferrite/martensite (F/M) interface decohesion prevails in all steels, (ii) the ferrite morphology has a strong influence on the fracture toughness of ultrahigh-strength DP steels, (iii) the effects of matrix type, ferrite size, and F/M hardness difference on the fracture toughness are relatively weak, (iv) the exceptional high fracture toughness of plate-like DP steel can be attributed to the crack deflection, crack divider and crack arrester mechanisms induced by F/M interface decohesion.
{"title":"Making ultrahigh-strength dual-phase steels tough: experiment and simulation","authors":"Lang Liu, Jiazhen He, Liejun Li, Zhiyuan Liang, Zhengwu Peng, Jixiang Gao, Mingxin Huang, Zhichao Luo","doi":"10.1016/j.jmst.2024.11.033","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.033","url":null,"abstract":"The low damage resistance and fracture toughness hinder the widespread application of ultrahigh-strength dual phase (DP) steels. In this work, we propose a novel strategy to improve the fracture toughness of ultrahigh-strength DP steels by an order of magnitude without sacrificing the tensile strength. Six ultrahigh-strength DP steels with varying microstructure but comparable tensile strength (>1400 MPa) were prepared via tailoring the heat treatment process after cold rolling. Additionally, finite element (FE) method incorporated with Gurson-Tvergaad-Needleman (GTN) model and cohesive zone model (CZM) is established to simulate the fracture behaviour of DP steel. Twelve model DP steels with different ferrite sizes and F/M strength differences are constructed. The combined experiment and simulation results demonstrate that (i) ferrite/martensite (F/M) interface decohesion prevails in all steels, (ii) the ferrite morphology has a strong influence on the fracture toughness of ultrahigh-strength DP steels, (iii) the effects of matrix type, ferrite size, and F/M hardness difference on the fracture toughness are relatively weak, (iv) the exceptional high fracture toughness of plate-like DP steel can be attributed to the crack deflection, crack divider and crack arrester mechanisms induced by F/M interface decohesion.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"288 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142880106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-22DOI: 10.1016/j.jmst.2024.12.006
Yuhan Lin, Lin Tang, Lei Cheng, Xiaoxi Zeng, Junliang Zhang, Yusheng Tang, Jie Kong, Junwei Gu
Poly(p-phenylenebenzobisoxazole) nanofibers (PNF), as a novel kind of nanofibers, have attracted significant attention from researchers. However, their poor ultraviolet (UV) resistance limits their potential applications. In this work, zinc oxide (ZnO) was uniformly coated on the surface of PNF-containing polysilsesquioxane (POSS) via in-situ growth to obtain (POSS-PNF)@ZnO. Subsequently, (POSS-PNF)@ZnO wave-transparent composite paper was then fabricated using a “vacuum filtration-assisted hot-pressing” method. Based on the coordination interaction between O–C=O groups of PNFs and ZnO, as well as the UV absorption/shielding capability of ZnO, the (POSS-PNF)@ZnO wave-transparent composite paper exhibited superior mechanical properties and UV resistance. At a hydrothermal reaction temperature of 80°C, the prepared (POSS-PNF)@ZnO wave-transparent composite paper exhibited the highest tensile strength (204.5 MPa) and toughness (12.3 MJ m³), which represents increases of 23.7% and 32.3%, respectively, compared to POSS-PNF wave-transparent paper. After 288 h of UV aging, the tensile strength retention rate was 77.4%, significantly higher than the 53.7% of POSS-PNF wave-transparent composite paper. Moreover, it exhibited excellent wave-transparent performance with a dielectric constant (ε) of 2.15 and a dielectric loss tangent (tanδ) of 0.044 at 10 GHz, resulting in a wave-transparent coefficient of 95.9%.
聚对苯并苯并异恶唑纳米纤维（PNF）作为一种新型的纳米纤维受到了广泛的关注。然而，它们较差的抗紫外线性限制了它们的潜在应用。在本研究中，通过原位生长将氧化锌（ZnO）均匀涂覆在含pnf的聚硅氧烷（POSS）表面，得到（POSS- pnf）@ZnO。随后，采用“真空过滤辅助热压”方法制备了（POSS-PNF）@ZnO波透明复合纸。基于pnf的O - c =O基团与ZnO的配位相互作用，以及ZnO的紫外吸收/屏蔽能力，（POSS-PNF）@ZnO波透明复合纸具有优异的力学性能和抗紫外性能。在80℃的水热反应温度下，制备的（POSS-PNF）@ZnO波透明复合纸的抗拉强度为204.5 MPa，韧性为12.3 MJ m³，比POSS-PNF波透明纸分别提高了23.7%和32.3%。经UV老化288 h后，抗拉强度保持率为77.4%，显著高于POSS-PNF波透明复合纸的53.7%。在10 GHz时，其介电常数ε为2.15，介电损耗正切tanδ为0.044，具有良好的波透明性能，其波透明系数为95.9%。
{"title":"Mechanically strong PBO wave-transparent composite papers with excellent UV resistance and ultra-low dielectric constant","authors":"Yuhan Lin, Lin Tang, Lei Cheng, Xiaoxi Zeng, Junliang Zhang, Yusheng Tang, Jie Kong, Junwei Gu","doi":"10.1016/j.jmst.2024.12.006","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.12.006","url":null,"abstract":"Poly(p-phenylenebenzobisoxazole) nanofibers (PNF), as a novel kind of nanofibers, have attracted significant attention from researchers. However, their poor ultraviolet (UV) resistance limits their potential applications. In this work, zinc oxide (ZnO) was uniformly coated on the surface of PNF-containing polysilsesquioxane (POSS) via in-situ growth to obtain (POSS-PNF)@ZnO. Subsequently, (POSS-PNF)@ZnO wave-transparent composite paper was then fabricated using a “vacuum filtration-assisted hot-pressing” method. Based on the coordination interaction between O–C=O groups of PNFs and ZnO, as well as the UV absorption/shielding capability of ZnO, the (POSS-PNF)@ZnO wave-transparent composite paper exhibited superior mechanical properties and UV resistance. At a hydrothermal reaction temperature of 80°C, the prepared (POSS-PNF)@ZnO wave-transparent composite paper exhibited the highest tensile strength (204.5 MPa) and toughness (12.3 MJ m³), which represents increases of 23.7% and 32.3%, respectively, compared to POSS-PNF wave-transparent paper. After 288 h of UV aging, the tensile strength retention rate was 77.4%, significantly higher than the 53.7% of POSS-PNF wave-transparent composite paper. Moreover, it exhibited excellent wave-transparent performance with a dielectric constant (<em>ε</em>) of 2.15 and a dielectric loss tangent (tan<em>δ</em>) of 0.044 at 10 GHz, resulting in a wave-transparent coefficient of 95.9%.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"41 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142869990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-21DOI: 10.1016/j.jmst.2024.12.007
Yingbin Chen, Xiaohong Shao, Ze Zhang, Jiangwei Wang
Grain boundary (GB) deformation and twinning behavior have been recognized as important contributors to the plasticity of polycrystalline materials. However, a comprehensive understanding of dynamic interplay between GB deformation and twinning behavior remains largely elusive. Using in situ nanomechanical testing, we reveal that GB plasticity and twinning plasticity can be strongly coupled in the context of various deformation characteristics, including lamellae-type twinning from GBs, GB splitting-associated twinning, twinning from triple junctions (TJs), and GB-mediated hierarchical twinning. These GB/TJ-associated twinning modes often arise from the combined effect of macroscopic (geometry-dominated) and microscopic (excess volume-dominated) degrees of freedom of GBs/TJs as an effective way to alleviate local stress concentration, which in turn provides a chance of adjusting GB mobility and enhancing the coordinated evolution of entire interface network in three-dimensional space. Such coupling between GB plasticity and twinning plasticity should represent a general deformation mode in different metallic materials, holding important implications for preventing premature GB cracking and enhancing material ductility.
{"title":"Grain boundary plasticity and twinning plasticity can be strongly coupled","authors":"Yingbin Chen, Xiaohong Shao, Ze Zhang, Jiangwei Wang","doi":"10.1016/j.jmst.2024.12.007","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.12.007","url":null,"abstract":"Grain boundary (GB) deformation and twinning behavior have been recognized as important contributors to the plasticity of polycrystalline materials. However, a comprehensive understanding of dynamic interplay between GB deformation and twinning behavior remains largely elusive. Using <em>in situ</em> nanomechanical testing, we reveal that GB plasticity and twinning plasticity can be strongly coupled in the context of various deformation characteristics, including lamellae-type twinning from GBs, GB splitting-associated twinning, twinning from triple junctions (TJs), and GB-mediated hierarchical twinning. These GB/TJ-associated twinning modes often arise from the combined effect of macroscopic (geometry-dominated) and microscopic (excess volume-dominated) degrees of freedom of GBs/TJs as an effective way to alleviate local stress concentration, which in turn provides a chance of adjusting GB mobility and enhancing the coordinated evolution of entire interface network in three-dimensional space. Such coupling between GB plasticity and twinning plasticity should represent a general deformation mode in different metallic materials, holding important implications for preventing premature GB cracking and enhancing material ductility.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"111 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142867154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bacterial biofilm infections, characterized by high mortality and challenging recovery, pose a significant global health risk. Developing innovative antibacterial materials and therapies, particularly those that mitigate resistance, is essential for effectively addressing biofilm-associated infections. Chemical dynamic therapy (CDT), which relies on hydroxyl radicals (·OH) generated from hydrogen peroxide (H2O2) to eliminate bacteria, has demonstrated potential in treating planktonic infections. However, traditional CDT is less effective against biofilm-related infections due to limited endogenous H2O2 and the protective extracellular polymeric matrix within biofilms. In this study, a composite nanoplatform based on CuO2 with self-supplying H2O2 capabilities and Fe3O4 with photothermal properties was designed to improve CDT efficacy for biofilm eradication. The Fe3O4/CuO2 composite nanoparticles (FC NPs) were synthesized by incorporating CuO2 into hollow mesoporous Fe3O4 using an in-situ growth technique. Within the mildly acidic biofilm microenvironment, CuO2 decomposes to release Cu2+ and H2O2. The Cu2+ subsequently catalyzes the Fenton-like conversion of the released H2O2 into ·OH. Concurrently, near-infrared (NIR) irradiation of Fe3O4 generates significant heat, boosting ·OH production and increasing bacterial membrane permeability, thereby enhancing bacterial vulnerability to ·OH. This nanoplatform demonstrated remarkable CDT efficacy, eradicating over 99.99% of methicillin-resistant Staphylococcus aureus (MRSA) and 99.97% of Pseudomonas aeruginosa biofilms within five minutes of NIR irradiation in vitro. Furthermore, in vivo experiments validated the nanoplatform's ability to eradicate biofilms and facilitate the healing of MRSA-infected wounds without adverse effects. This H2O2 self-supplying and heat-enhancing approach presents a promising strategy to overcome the limitations of CDT in biofilm-related infection treatment.
{"title":"Enhanced chemodynamic therapy for biofilm eradication: A self-supplied H2O2 nanoplatform with integrated photothermal property","authors":"Dongxu Jia, Haixin Zhang, Wei Yang, Xinyan Zheng, Hu Xu, Yanxia Zhang, Qian Yu","doi":"10.1016/j.jmst.2024.11.040","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.040","url":null,"abstract":"Bacterial biofilm infections, characterized by high mortality and challenging recovery, pose a significant global health risk. Developing innovative antibacterial materials and therapies, particularly those that mitigate resistance, is essential for effectively addressing biofilm-associated infections. Chemical dynamic therapy (CDT), which relies on hydroxyl radicals (·OH) generated from hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) to eliminate bacteria, has demonstrated potential in treating planktonic infections. However, traditional CDT is less effective against biofilm-related infections due to limited endogenous H<sub>2</sub>O<sub>2</sub> and the protective extracellular polymeric matrix within biofilms. In this study, a composite nanoplatform based on CuO<sub>2</sub> with self-supplying H<sub>2</sub>O<sub>2</sub> capabilities and Fe<sub>3</sub>O<sub>4</sub> with photothermal properties was designed to improve CDT efficacy for biofilm eradication. The Fe<sub>3</sub>O<sub>4</sub>/CuO<sub>2</sub> composite nanoparticles (FC NPs) were synthesized by incorporating CuO<sub>2</sub> into hollow mesoporous Fe<sub>3</sub>O<sub>4</sub> using an in-situ growth technique. Within the mildly acidic biofilm microenvironment, CuO<sub>2</sub> decomposes to release Cu<sup>2+</sup> and H<sub>2</sub>O<sub>2</sub>. The Cu<sup>2+</sup> subsequently catalyzes the Fenton-like conversion of the released H<sub>2</sub>O<sub>2</sub> into ·OH. Concurrently, near-infrared (NIR) irradiation of Fe<sub>3</sub>O<sub>4</sub> generates significant heat, boosting ·OH production and increasing bacterial membrane permeability, thereby enhancing bacterial vulnerability to ·OH. This nanoplatform demonstrated remarkable CDT efficacy, eradicating over 99.99% of methicillin-resistant <em>Staphylococcus aureus</em> (MRSA) and 99.97% of <em>Pseudomonas aeruginosa</em> biofilms within five minutes of NIR irradiation <em>in vitro</em>. Furthermore, <em>in vivo</em> experiments validated the nanoplatform's ability to eradicate biofilms and facilitate the healing of MRSA-infected wounds without adverse effects. This H<sub>2</sub>O<sub>2</sub> self-supplying and heat-enhancing approach presents a promising strategy to overcome the limitations of CDT in biofilm-related infection treatment.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"76 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142867155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-21DOI: 10.1016/j.jmst.2024.11.039
Shiyu Jia, Cai Qi, Shengduo Xu, Lei Yang, Qiang Sun
Thermoelectric (TE) materials, with the ability to convert heat into electrical energy, can generate micro-electrical fields at electronic interfaces with biological systems, making them applicable in electric-catalyzing as nanozymes, and modulate the infected microenvironment of skin wounds. Thereby, by harnessing temperature differences in vitro or in vivo, TE nanomaterials can provide antimicrobial reactive oxygen species (ROS) by catalyzing redox reactions, thereby accelerating wound healing by suppressing infection. However, despite their promising potential, there is still a lack of comprehensive understanding of the antimicrobial mechanisms, biocompatibility, and practical applications of TE nanomaterials in wound healing, as this is a newly-emerged sub-area of energy-related biomedical applications. This review aims to address this gap by highlighting the emerging progress of TE materials in wound healing, clarifying their mechanism and advances, emphasizing their potential challenges for commercialization and clinical use, and proposing novel design strategies of TE nanomaterials for effective antibacterial performance.
{"title":"Advancements of thermoelectric nanomaterials in ROS-mediated broad-spectrum antibacterial therapies for wound healing","authors":"Shiyu Jia, Cai Qi, Shengduo Xu, Lei Yang, Qiang Sun","doi":"10.1016/j.jmst.2024.11.039","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.039","url":null,"abstract":"Thermoelectric (TE) materials, with the ability to convert heat into electrical energy, can generate micro-electrical fields at electronic interfaces with biological systems, making them applicable in electric-catalyzing as nanozymes, and modulate the infected microenvironment of skin wounds. Thereby, by harnessing temperature differences <em>in vitro</em> or <em>in vivo</em>, TE nanomaterials can provide antimicrobial reactive oxygen species (ROS) by catalyzing redox reactions, thereby accelerating wound healing by suppressing infection. However, despite their promising potential, there is still a lack of comprehensive understanding of the antimicrobial mechanisms, biocompatibility, and practical applications of TE nanomaterials in wound healing, as this is a newly-emerged sub-area of energy-related biomedical applications. This review aims to address this gap by highlighting the emerging progress of TE materials in wound healing, clarifying their mechanism and advances, emphasizing their potential challenges for commercialization and clinical use, and proposing novel design strategies of TE nanomaterials for effective antibacterial performance.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"83 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142867156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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