Pub Date : 2024-09-07DOI: 10.1016/j.mtcomm.2024.110361
Wenling Wu, Yinghao Chen, Juan Ji, Xiaoyan Wang, Xuan Zhang, Yang cheng, Haoyuan Xi, Jiang Guo, Jianfeng Zhu
As a valuable symbol of human cultural heritage, bronze inevitably endures varying degrees of corrosion due to environmental change. Thus, developing an efficient protective coating for bronze is crucial to ensure bronze relics receive more protection. Herein, a multifunctional organic-inorganic hybrid composite coating of 1 H,1 H,2 H,2 H-Perfluorodecyltriethoxysilane (PFDTES), TiCT nanosheets and TiO nanoparticles (PFDTES@TiCT/TiO) are successfully prepared and coated the bronze, which exhibits excellent anti-corrosion, weathering stability and superhydrophobicity. The superhydrophobicity of coating is derived from introducing a low surface energy C-F bond. Furthermore, the corrosion protection ability can be improved by the barrier effect of TiCT nanosheets, and TiO nanoparticles can enhance the weathering stability of coatings by providing exceptional abrasion resistance and ultraviolet (UV) resistance capabilities. Morphological examination, X-ray photoelectron spectroscopy, an accelerated aging test, and electrochemical measurements, among other methods, were used to research the protective effect and anticorrosion performance of organic-inorganic hybrid coatings. It can be found that the composite coatings have a large water contact angle (153°) and form a superhydrophobic surface. Furthermore, electrochemical results show that the superhydrophobic PFDTES@TiCT/TiO coating has a higher low-frequency impedance modulus and lower current density than the uncoated substrate, indicating enhanced corrosion resistance. Based on solid and liquid pollutant tests, the PFDTES@TiCT/TiO coatings also showed good self-cleaning and antifouling properties. And coating maintained good transparency without changing the bronze color and appearance. In conclusion, the superhydrophobic PFDTES@TiCT/TiO composite coating has potential applications in the field of bronze protection.
{"title":"Novel fluorine-functionalized Ti3C2Tx/TiO2 hybrid coatings with enhanced weatherability, antifouling, and interfacial anticorrosion performances","authors":"Wenling Wu, Yinghao Chen, Juan Ji, Xiaoyan Wang, Xuan Zhang, Yang cheng, Haoyuan Xi, Jiang Guo, Jianfeng Zhu","doi":"10.1016/j.mtcomm.2024.110361","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2024.110361","url":null,"abstract":"As a valuable symbol of human cultural heritage, bronze inevitably endures varying degrees of corrosion due to environmental change. Thus, developing an efficient protective coating for bronze is crucial to ensure bronze relics receive more protection. Herein, a multifunctional organic-inorganic hybrid composite coating of 1 H,1 H,2 H,2 H-Perfluorodecyltriethoxysilane (PFDTES), TiCT nanosheets and TiO nanoparticles (PFDTES@TiCT/TiO) are successfully prepared and coated the bronze, which exhibits excellent anti-corrosion, weathering stability and superhydrophobicity. The superhydrophobicity of coating is derived from introducing a low surface energy C-F bond. Furthermore, the corrosion protection ability can be improved by the barrier effect of TiCT nanosheets, and TiO nanoparticles can enhance the weathering stability of coatings by providing exceptional abrasion resistance and ultraviolet (UV) resistance capabilities. Morphological examination, X-ray photoelectron spectroscopy, an accelerated aging test, and electrochemical measurements, among other methods, were used to research the protective effect and anticorrosion performance of organic-inorganic hybrid coatings. It can be found that the composite coatings have a large water contact angle (153°) and form a superhydrophobic surface. Furthermore, electrochemical results show that the superhydrophobic PFDTES@TiCT/TiO coating has a higher low-frequency impedance modulus and lower current density than the uncoated substrate, indicating enhanced corrosion resistance. Based on solid and liquid pollutant tests, the PFDTES@TiCT/TiO coatings also showed good self-cleaning and antifouling properties. And coating maintained good transparency without changing the bronze color and appearance. In conclusion, the superhydrophobic PFDTES@TiCT/TiO composite coating has potential applications in the field of bronze protection.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142268169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-07DOI: 10.1016/j.mtcomm.2024.110337
Marius Hoffmann, Zina Kallien, Eduardo Antunes Duda, Benjamin Klusemann
Friction surfacing (FS) is a solid state layer deposition technique with a simple setup, presenting advantages compared to fusion-based approaches. Previous investigations showed microstructural gradients along layer width and thickness. The current study provides new insight into the FS layer formation for aluminum and its relation with the microstructure evolution. Special consumable studs containing two different aluminum alloys were used to visualize the different materials in the resulting deposit. The investigation was performed at different process parameters, revealing some fundamental material flow characteristics. The layer center presents inner stud material, where advancing side and top are formed by outer stud material. The bottom and retreating side present a mixture of inner and outer stud material. The part of the layer that is formed by the outer material, presumably undergoes higher strain rates during deposition, presenting finer grains. The top of FS layers shows a pronounced texture, shear texture components, compared to the other parts with random texture. This phenomenon can be related to the shearing of the stud material between already deposited material below and the stud at its rear edge. Overall, the FS layer formation characteristics revealed in this study are directly related to local microstructural properties.
{"title":"Insight into layer formation during friction surfacing: Relationship between deposition behavior and microstructure","authors":"Marius Hoffmann, Zina Kallien, Eduardo Antunes Duda, Benjamin Klusemann","doi":"10.1016/j.mtcomm.2024.110337","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2024.110337","url":null,"abstract":"Friction surfacing (FS) is a solid state layer deposition technique with a simple setup, presenting advantages compared to fusion-based approaches. Previous investigations showed microstructural gradients along layer width and thickness. The current study provides new insight into the FS layer formation for aluminum and its relation with the microstructure evolution. Special consumable studs containing two different aluminum alloys were used to visualize the different materials in the resulting deposit. The investigation was performed at different process parameters, revealing some fundamental material flow characteristics. The layer center presents inner stud material, where advancing side and top are formed by outer stud material. The bottom and retreating side present a mixture of inner and outer stud material. The part of the layer that is formed by the outer material, presumably undergoes higher strain rates during deposition, presenting finer grains. The top of FS layers shows a pronounced texture, shear texture components, compared to the other parts with random texture. This phenomenon can be related to the shearing of the stud material between already deposited material below and the stud at its rear edge. Overall, the FS layer formation characteristics revealed in this study are directly related to local microstructural properties.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142268174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-07DOI: 10.1016/j.mtcomm.2024.110365
Rupesh Kumar, R.K. Gautam
This research emphasizes the development of biocompatible Ti-xNb (0, 5, 10, 15, 20, and 25 wt.%) alloys through powder metallurgy to attain a lower elastic modulus, high strength, low wear, and high corrosion resistance appropriate for biomedical implants. The developed alloys were comprehensively analyzed through microstructural, physical, mechanical, electrochemical, biological, and tribological investigations to assess their suitability by comparing their properties with commercially pure titanium (cpTi). The outcomes demonstrate, powder metallurgy is an effective route for developing Ti-Nb alloys with several desirable properties. Incorporating niobium (Nb) into titanium (Ti) introduces the β phase within the alloys, which increases with Nb concentration and contributes to decreasing the elastic modulus to as low as 43.47 ± 4.9 GPa. All Ti-Nb alloys exhibits higher hardness and compressive strength than cpTi, with values of 403.23 ± 21.38 HV and 1322.45 ± 25.64 MPa obtained for the Ti-10Nb alloy. A lower concentration of Nb shows comparable corrosion resistance of the Ti-Nb alloys to cpTi, whereas a higher Nb concentration is unfavorable. Furthermore, the tribological findings demonstrate superior antifriction and antiwear properties in all Ti-Nb alloys compared to cpTi. Notably, Ti-10Nb displays outstanding wear resistance with a 41.82% lower friction coefficient in dry conditions and 31.11% in simulated body fluid (SBF), along with 81.08% reduction in wear volume in dry conditions and 63.11% in SBF compared to cpTi. Among all developed alloys, Ti-10Nb exhibits various desired properties, suggesting its potential as an alternative to cpTi for biomedical implant applications.
{"title":"Investigation of sliding wear, electrochemical corrosion, and biocompatibility of Ti-Nb alloys for biomedical applications","authors":"Rupesh Kumar, R.K. Gautam","doi":"10.1016/j.mtcomm.2024.110365","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2024.110365","url":null,"abstract":"This research emphasizes the development of biocompatible Ti-xNb (0, 5, 10, 15, 20, and 25 wt.%) alloys through powder metallurgy to attain a lower elastic modulus, high strength, low wear, and high corrosion resistance appropriate for biomedical implants. The developed alloys were comprehensively analyzed through microstructural, physical, mechanical, electrochemical, biological, and tribological investigations to assess their suitability by comparing their properties with commercially pure titanium (cpTi). The outcomes demonstrate, powder metallurgy is an effective route for developing Ti-Nb alloys with several desirable properties. Incorporating niobium (Nb) into titanium (Ti) introduces the β phase within the alloys, which increases with Nb concentration and contributes to decreasing the elastic modulus to as low as 43.47 ± 4.9 GPa. All Ti-Nb alloys exhibits higher hardness and compressive strength than cpTi, with values of 403.23 ± 21.38 HV and 1322.45 ± 25.64 MPa obtained for the Ti-10Nb alloy. A lower concentration of Nb shows comparable corrosion resistance of the Ti-Nb alloys to cpTi, whereas a higher Nb concentration is unfavorable. Furthermore, the tribological findings demonstrate superior antifriction and antiwear properties in all Ti-Nb alloys compared to cpTi. Notably, Ti-10Nb displays outstanding wear resistance with a 41.82% lower friction coefficient in dry conditions and 31.11% in simulated body fluid (SBF), along with 81.08% reduction in wear volume in dry conditions and 63.11% in SBF compared to cpTi. Among all developed alloys, Ti-10Nb exhibits various desired properties, suggesting its potential as an alternative to cpTi for biomedical implant applications.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142268413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-07DOI: 10.1016/j.mtcomm.2024.110373
Xiu Ye, Xiaojie Shi, Xiaojin Miao, Peipei Lu, Meiping Wu
In order to meet the various performance requirements of bone implants, it is necessary to design a porous structure with multi-scale pores. In this paper, a set of 2-level fractal porous structures and 1-level porous structures P80 and P85 were designed based on the sheet-Gyroid porous structure. The influence of porosity and fractal design on the forming quality, mechanical properties and corrosion resistance of the porous structures was investigated. The results showed that the porosity deviation of the 2-level porous structures was in the range of 17.88–20.79 %, which was about twice that of the 1-level porous structures. The elastic gradient of 2-level fractal porous structures varied from 1.654 GPa to 3.636 GPa, the compressive offset strength ranged from 50.9 MPa to 111.5 MPa, and the first maximum compressive strength was in the range of 57.8 MPa to 136.6 MPa, all of which were lower than those of 1-level porous structures with similar porosity, which extended the design range of mechanical properties of porous structures to a certain extent, and was conducive to avoiding the stress shielding effect of implants. Based on the study of mechanical properties of 2-level fractal porous structures, the mechanical properties prediction models were constructed based on the improved G-A model. In addition, it was found that the corrosion resistance of 2-level fractal porous structures was much higher than that of 1-level porous structures, and the corrosion resistance decreased with the increase of porosity. The fractal design of TPMS structure can effectively expand the design space of porous bone implants.
{"title":"The influence mechanism of fractal design method on mechanical properties and corrosion behavior of sheet Gyroid porous structures formed by LPBF","authors":"Xiu Ye, Xiaojie Shi, Xiaojin Miao, Peipei Lu, Meiping Wu","doi":"10.1016/j.mtcomm.2024.110373","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2024.110373","url":null,"abstract":"In order to meet the various performance requirements of bone implants, it is necessary to design a porous structure with multi-scale pores. In this paper, a set of 2-level fractal porous structures and 1-level porous structures P80 and P85 were designed based on the sheet-Gyroid porous structure. The influence of porosity and fractal design on the forming quality, mechanical properties and corrosion resistance of the porous structures was investigated. The results showed that the porosity deviation of the 2-level porous structures was in the range of 17.88–20.79 %, which was about twice that of the 1-level porous structures. The elastic gradient of 2-level fractal porous structures varied from 1.654 GPa to 3.636 GPa, the compressive offset strength ranged from 50.9 MPa to 111.5 MPa, and the first maximum compressive strength was in the range of 57.8 MPa to 136.6 MPa, all of which were lower than those of 1-level porous structures with similar porosity, which extended the design range of mechanical properties of porous structures to a certain extent, and was conducive to avoiding the stress shielding effect of implants. Based on the study of mechanical properties of 2-level fractal porous structures, the mechanical properties prediction models were constructed based on the improved G-A model. In addition, it was found that the corrosion resistance of 2-level fractal porous structures was much higher than that of 1-level porous structures, and the corrosion resistance decreased with the increase of porosity. The fractal design of TPMS structure can effectively expand the design space of porous bone implants.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142268409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Two-dimensional (2D) (110)-oriented cubic carbon and boron nitride (C/BN) heterogeneous sandwich structures are composed of three layers. Owing to the relaxation of the structures' unsaturated surface, they have a residual magnetic moment and exhibit distinct paramagnetic properties. Hydrogenation and fluorination can help maintain the cubic structure and shift the structure from an indirect band gap semiconductor to a direct band gap semiconductor. The band gap value and work function can be controlled following the intermediate C or BN layer increase for such BN-(C)n-BN or C-(BN)n-C structures. The structures have high optical absorption in the ultraviolet region, and the maximum absorption peak of the H-C-BN-C-H structure is slightly bigger than that of H-BN-C-BN-H. They exhibit a low static refractive index, implying that light propagates faster than in the bulk. The results represent an emerging new area of intensive research, covering a broad spectrum of materials, physics, and applications.
{"title":"Predicting the structures and properties of 2D (110)-oriented cubic carbon and boron nitride (C/BN) heterogeneous sandwich structures by first principal studies","authors":"Jia Li, Xuhao He, Miao Zhang, Jian Zhang, Jiajia Mu, Chao Zhang, Yibo Ma","doi":"10.1016/j.mtcomm.2024.110354","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2024.110354","url":null,"abstract":"Two-dimensional (2D) (110)-oriented cubic carbon and boron nitride (C/BN) heterogeneous sandwich structures are composed of three layers. Owing to the relaxation of the structures' unsaturated surface, they have a residual magnetic moment and exhibit distinct paramagnetic properties. Hydrogenation and fluorination can help maintain the cubic structure and shift the structure from an indirect band gap semiconductor to a direct band gap semiconductor. The band gap value and work function can be controlled following the intermediate C or BN layer increase for such BN-(C)n-BN or C-(BN)n-C structures. The structures have high optical absorption in the ultraviolet region, and the maximum absorption peak of the H-C-BN-C-H structure is slightly bigger than that of H-BN-C-BN-H. They exhibit a low static refractive index, implying that light propagates faster than in the bulk. The results represent an emerging new area of intensive research, covering a broad spectrum of materials, physics, and applications.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142268177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-06DOI: 10.1016/j.mtcomm.2024.110316
Xu Lu, Wei Hong, Tingyu Liu, Huifang Li, Jianghai Wang
The defect formation energy, electronic structures and optical properties of paraelectric phase (PE-KDP) and ferroelectric phase (FE-KDP) crystals with Y substitute K(Y) defects have been investigated using density function theory. The doping of Y atoms leads to changes in bond lengths around the defects for the different charged defect. The most pronounced changes occur in the O-H and O-Y bond lengths, which disrupts the geometrical symmetry of the original crystals. According to the defect formation energy, defects are likely to be most stable in the +2 charged state. The conduction band shifts down and band gap reduces caused by Y defect. New defect states in the bandgap mainly arise from the interaction between 2p orbitals of O and 4d orbitals of Y. The calculated absorption peaks are at 1.715(723 nm), 6.907 eV(180 nm), 3.178(390 nm), and 6.299 eV(197 nm) for PE-KDP. The 197 nm absorption band is close to the absorption of the experimental samples at 190–250 nm. The absorption bands of FE-KDP presents in the UV and visible range.
利用密度函数理论研究了带有 Y 替代 K(Y) 缺陷的副电相（PE-KDP）和铁电相（FE-KDP）晶体的缺陷形成能、电子结构和光学特性。掺入 Y 原子会导致不同带电缺陷周围的键长发生变化。最明显的变化发生在 O-H 和 O-Y 键长上，这破坏了原始晶体的几何对称性。根据缺陷形成能量，+2 电荷态的缺陷可能最稳定。Y 缺陷导致导带下移，带隙减小。带隙中的新缺陷态主要来自于 O 的 2p 轨道和 Y 的 4d 轨道之间的相互作用。PE-KDP 的计算吸收峰分别位于 1.715（723 nm）、6.907 eV（180 nm）、3.178（390 nm）和 6.299 eV（197 nm）处。197 nm 吸收带与实验样品在 190-250 nm 处的吸收相近。FE-KDP 的吸收带在紫外和可见光范围内。
{"title":"First-principles study on the optical and electronic properties of YK defects in KH2PO4 crystals","authors":"Xu Lu, Wei Hong, Tingyu Liu, Huifang Li, Jianghai Wang","doi":"10.1016/j.mtcomm.2024.110316","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2024.110316","url":null,"abstract":"The defect formation energy, electronic structures and optical properties of paraelectric phase (PE-KDP) and ferroelectric phase (FE-KDP) crystals with Y substitute K(Y) defects have been investigated using density function theory. The doping of Y atoms leads to changes in bond lengths around the defects for the different charged defect. The most pronounced changes occur in the O-H and O-Y bond lengths, which disrupts the geometrical symmetry of the original crystals. According to the defect formation energy, defects are likely to be most stable in the +2 charged state. The conduction band shifts down and band gap reduces caused by Y defect. New defect states in the bandgap mainly arise from the interaction between 2p orbitals of O and 4d orbitals of Y. The calculated absorption peaks are at 1.715(723 nm), 6.907 eV(180 nm), 3.178(390 nm), and 6.299 eV(197 nm) for PE-KDP. The 197 nm absorption band is close to the absorption of the experimental samples at 190–250 nm. The absorption bands of FE-KDP presents in the UV and visible range.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142268180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The issues of electromagnetic wave pollution and electromagnetic interference (EMI) are becoming worse due to the quick growth of wireless communication and the enormous desire for portable, intelligent devices. The development of materials with strong electromagnetic shielding capability and ultra-thin flexibility is urgently needed. The goal of this study was to develop and create a flexible, ultra-thin FeO/Wood/Cu composite film with high EMI shielding performance using in-situ impregnation of FeO and electroless Cu method, followed by densification. The FeO/Wood/Cu-40 composite film exhibits good EMI shielding performance of 56.62 dB and strong conductivity of 188.7 S cm at just 150 μm in thickness. Notably, the FeO/Wood/Cu-40 composite film's specific electromagnetic shielding effectiveness (SSE/t) in the X-band is 4919.60 dB cm g, which is higher than the majority of the hardwood electromagnetic shielding materials that have been reported to date. Because FeO and metal copper provide wood its electromagnetic double loss properties, the FeO/Wood/Cu-40 composite film has a high absorption coefficient (A=0.54), suggesting effective electromagnetic wave absorption. Furthermore, the FeO/Wood/Cu composite sheet has outstanding mechanical qualities and a smooth surface. The developed flexible ultrathin FeO/Wood/Cu composite material may be used for wearing smart devices and has a wide range of potential applications in the area of electromagnetic shielding.
由于无线通信的快速发展和人们对便携式智能设备的巨大需求，电磁波污染和电磁干扰（EMI）问题日益严重。开发具有强大电磁屏蔽能力和超薄柔性的材料迫在眉睫。本研究的目标是利用原位浸渍氧化铁和无电解铜方法，开发并制造出具有高电磁干扰屏蔽性能的柔性超薄氧化铁/木材/铜复合薄膜，然后进行致密化处理。厚度仅为 150 μm 的 FeO/Wood/Cu-40 复合薄膜具有 56.62 dB 的良好 EMI 屏蔽性能和 188.7 S cm 的强导电性。值得注意的是，FeO/Wood/Cu-40 复合薄膜在 X 波段的比电磁屏蔽效能（SSE/t）为 4919.60 dB cm g，高于目前已报道的大多数硬木电磁屏蔽材料。由于氧化铁和金属铜为木材提供了电磁双损耗特性，FeO/Wood/Cu-40 复合薄膜具有较高的吸收系数（A=0.54），表明它能有效吸收电磁波。此外，FeO/Wood/Cu 复合薄膜还具有出色的机械性能和光滑的表面。所开发的柔性超薄 FeO/Wood/Cu 复合材料可用于佩戴智能设备，在电磁屏蔽领域具有广泛的潜在应用。
{"title":"Flexible and ultrathin Fe3O4/Wood/Cu composite films for efficient electromagnetic interference shielding","authors":"Mayin Dai, Xin Zheng, Qiang Guo, Shuaiqi Hu, Fengqi Qiu, Yanfei Pan","doi":"10.1016/j.mtcomm.2024.110351","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2024.110351","url":null,"abstract":"The issues of electromagnetic wave pollution and electromagnetic interference (EMI) are becoming worse due to the quick growth of wireless communication and the enormous desire for portable, intelligent devices. The development of materials with strong electromagnetic shielding capability and ultra-thin flexibility is urgently needed. The goal of this study was to develop and create a flexible, ultra-thin FeO/Wood/Cu composite film with high EMI shielding performance using in-situ impregnation of FeO and electroless Cu method, followed by densification. The FeO/Wood/Cu-40 composite film exhibits good EMI shielding performance of 56.62 dB and strong conductivity of 188.7 S cm at just 150 μm in thickness. Notably, the FeO/Wood/Cu-40 composite film's specific electromagnetic shielding effectiveness (SSE/t) in the X-band is 4919.60 dB cm g, which is higher than the majority of the hardwood electromagnetic shielding materials that have been reported to date. Because FeO and metal copper provide wood its electromagnetic double loss properties, the FeO/Wood/Cu-40 composite film has a high absorption coefficient (A=0.54), suggesting effective electromagnetic wave absorption. Furthermore, the FeO/Wood/Cu composite sheet has outstanding mechanical qualities and a smooth surface. The developed flexible ultrathin FeO/Wood/Cu composite material may be used for wearing smart devices and has a wide range of potential applications in the area of electromagnetic shielding.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142268178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-06DOI: 10.1016/j.mtcomm.2024.110298
Na Xu, Chi Pang, Wenfang Tong, Jiangmei Liu, Long Li, Peng Xu
Biomedical titanium alloys exhibit limitations in their application within the medical field as a result of insufficient bioactivity, potential allergic reactions, and constrained mechanical properties. Surface modification is regarded as an effective method to enhance the interaction between implants and biological systems. In this study, β-type TiNbZr alloy coatings with varying Zr content were successfully fabricated on Ti6Al4V (TC4) using laser cladding modification technology, with the objective of enhancing the mechanical interlocking between the matrix and bone tissue. The mechanical properties and biological activity of the coating were deeply investigated to assess its viability as an implant material. The results indicate that the surface of the matrix has been successfully coated with a metallurgically bonded layer, exhibiting an average thickness of 844.596 ± 51.208 μm. An increase in Zr content facilitated the transformation of the duplex α+β structure into a β-phase structure. The average hardness of the coating was 381.42 HV, with the hardness of the duplex structure surpassing that of the single-phase structure; notably, the hardness value for 5 wt% Zr (406 HV) was the highest. The corrosion current was reduced by two orders of magnitude, and primarily localized corrosion occurs, with microcracks and corrosion pits forming. The surface roughness exhibited an inverse relationship with the contact angle, and the surface hydrophilicity and micron-level roughness (0.726–0.945 μm) were conducive to cell adhesion. Furthermore, the formation of the Ca/P phase during the biomineralization test substantiated that the coating exhibits biological activity conducive to promoting cell growth. This research offers novel perspectives for the design and optimization of β-type TiNbxZr alloy coating materials with excellent corrosion resistance, higher hardness, and biological activity.
{"title":"Evaluation of microstructure, mechanical properties and osseointegration capacity of laser cladding β-type TiNbZr coatings","authors":"Na Xu, Chi Pang, Wenfang Tong, Jiangmei Liu, Long Li, Peng Xu","doi":"10.1016/j.mtcomm.2024.110298","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2024.110298","url":null,"abstract":"Biomedical titanium alloys exhibit limitations in their application within the medical field as a result of insufficient bioactivity, potential allergic reactions, and constrained mechanical properties. Surface modification is regarded as an effective method to enhance the interaction between implants and biological systems. In this study, β-type TiNbZr alloy coatings with varying Zr content were successfully fabricated on Ti6Al4V (TC4) using laser cladding modification technology, with the objective of enhancing the mechanical interlocking between the matrix and bone tissue. The mechanical properties and biological activity of the coating were deeply investigated to assess its viability as an implant material. The results indicate that the surface of the matrix has been successfully coated with a metallurgically bonded layer, exhibiting an average thickness of 844.596 ± 51.208 μm. An increase in Zr content facilitated the transformation of the duplex α+β structure into a β-phase structure. The average hardness of the coating was 381.42 HV, with the hardness of the duplex structure surpassing that of the single-phase structure; notably, the hardness value for 5 wt% Zr (406 HV) was the highest. The corrosion current was reduced by two orders of magnitude, and primarily localized corrosion occurs, with microcracks and corrosion pits forming. The surface roughness exhibited an inverse relationship with the contact angle, and the surface hydrophilicity and micron-level roughness (0.726–0.945 μm) were conducive to cell adhesion. Furthermore, the formation of the Ca/P phase during the biomineralization test substantiated that the coating exhibits biological activity conducive to promoting cell growth. This research offers novel perspectives for the design and optimization of β-type TiNbxZr alloy coating materials with excellent corrosion resistance, higher hardness, and biological activity.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142268181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-06DOI: 10.1016/j.mtcomm.2024.110348
Xuelin Li, Zhuangzhuang Li, Zhuoyu Guo, Yue Zhou, Jiahui Lin, Zongtao Guo, Zonglai Mo, Jun Li
A novel crossed star-shaped honeycomb (CSSH) is obtained by replacing the horizontal and vertical walls of a classical star-shaped honeycomb (SSH) with crossed inclined walls. Two reinforced crossed star-shaped honeycombs (RCSSH) were further constructed by tailoring the cross-connecting ligaments. In this paper, to reveal the mechanical properties of these honeycombs under inclined loads, tilted specimens of the SSH and the three kinds of CSSHs were fabricated based on the additive manufacturing technique, and quasi-static compression experiments were conducted on them. The experimental results show that all four honeycombs exhibit a significant negative Poisson's ratio phenomenon under inclined loading. Notably, the RCSSH-1 exhibits optimal deformation stability and the strongest energy absorption, with a specific energy absorption (SEA) 165.6 % higher than that of classical SSH. Afterward, to explore the deformation mode, compressive strength, and energy absorption of SSH and three kinds of CSSH under inclined dynamic load, the corresponding numerical models were established, and the numerical methods were validated using experimental data. Then, the relationship between the wall thickness and crashworthiness of the honeycomb with the best energy absorption effect in CSSH was analyzed based on numerical simulations. The results show that both the oblique angle and the wall thickness have a large effect on the compressive strength and energy absorption of the honeycomb. The energy absorption capacity of a honeycomb does not necessarily deteriorate at smaller oblique angles for low-velocity impacts. While at larger oblique angles, all four honeycombs showed unstable deformation, which drastically reduced their mechanical properties; at medium-velocity impact, the compressive strength and energy absorption capacity of the remaining three honeycombs, excluding RCSSH-2, fluctuated less with the increase of the oblique angle; at high-velocity impact, the compressive strengths of the four honeycombs showed a tendency to increase with the increase of the oblique angle, but there was not much difference in their SEA.
{"title":"Mechanical response and stability of a novel crossed star honeycomb under inclined loading","authors":"Xuelin Li, Zhuangzhuang Li, Zhuoyu Guo, Yue Zhou, Jiahui Lin, Zongtao Guo, Zonglai Mo, Jun Li","doi":"10.1016/j.mtcomm.2024.110348","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2024.110348","url":null,"abstract":"A novel crossed star-shaped honeycomb (CSSH) is obtained by replacing the horizontal and vertical walls of a classical star-shaped honeycomb (SSH) with crossed inclined walls. Two reinforced crossed star-shaped honeycombs (RCSSH) were further constructed by tailoring the cross-connecting ligaments. In this paper, to reveal the mechanical properties of these honeycombs under inclined loads, tilted specimens of the SSH and the three kinds of CSSHs were fabricated based on the additive manufacturing technique, and quasi-static compression experiments were conducted on them. The experimental results show that all four honeycombs exhibit a significant negative Poisson's ratio phenomenon under inclined loading. Notably, the RCSSH-1 exhibits optimal deformation stability and the strongest energy absorption, with a specific energy absorption (SEA) 165.6 % higher than that of classical SSH. Afterward, to explore the deformation mode, compressive strength, and energy absorption of SSH and three kinds of CSSH under inclined dynamic load, the corresponding numerical models were established, and the numerical methods were validated using experimental data. Then, the relationship between the wall thickness and crashworthiness of the honeycomb with the best energy absorption effect in CSSH was analyzed based on numerical simulations. The results show that both the oblique angle and the wall thickness have a large effect on the compressive strength and energy absorption of the honeycomb. The energy absorption capacity of a honeycomb does not necessarily deteriorate at smaller oblique angles for low-velocity impacts. While at larger oblique angles, all four honeycombs showed unstable deformation, which drastically reduced their mechanical properties; at medium-velocity impact, the compressive strength and energy absorption capacity of the remaining three honeycombs, excluding RCSSH-2, fluctuated less with the increase of the oblique angle; at high-velocity impact, the compressive strengths of the four honeycombs showed a tendency to increase with the increase of the oblique angle, but there was not much difference in their SEA.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The research and development of next generation amorphous aluminosilicate glass is hampered by the absence of reasonable minimum structural unit model, which should display more satisfactory mechanical strength and better production process compatibility. In this report, the minimum structural unit of Corning gorilla series of amorphous aluminosilicate glass is explored by the cluster-plus-glue-atom (CPGA) model, preliminarily. Taking typical -tridymite () as the parent phase material, the cluster formula (CF) and unit cluster of are established as [Si-O]Si and [(CF)-(CF)](CF). The metal cations (MC, 2≤≤5 and ≠4) are the network former, which are introduced into [Si-O]MC structure. Besides, MC is also introduced into the amorphous aluminosilicate glass as network external, which keeps the sum valence of MC and MC as 4. In case of Corning gorilla series of amorphous aluminosilicate glass, the composition is firstly measured by Special Glass Key Laboratory of Hainan Province. Then, the unit clusters of Corning gorilla series of amorphous aluminosilicate glass are analyzed by CPGA model. The results reveal that the development trend mainly depends on the improvement of MC content, which is gradually improved from 4 to 10. Besides, CPGA unit clusters results of six generations amorphous aluminosilicate glass correspond well with the measurement results, which reflect the rationality of CPGA model. Based on CPGA unit cluster [(CF)-(CF)](CF), the upper limit of MC content for amorphous aluminosilicate glass is 12. So, CPGA unit clusters for next generation of amorphous aluminosilicate glass are designed, which could further improve MC content from 10 to 11. With the guidance of CPGA model, the amorphous aluminosilicate glass enterprise, as well as other kinds of glass enterprise, could avoid the huge research and development costs, as well long research and development time.
{"title":"Preliminarily exploration of the minimum structural unit of amorphous aluminosilicate glass by cluster-plus-glue-atom model","authors":"Qizhen Wang, Shuang Zhang, Yanping Ma, Wanyu Ding, Chuang Dong","doi":"10.1016/j.mtcomm.2024.110355","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2024.110355","url":null,"abstract":"The research and development of next generation amorphous aluminosilicate glass is hampered by the absence of reasonable minimum structural unit model, which should display more satisfactory mechanical strength and better production process compatibility. In this report, the minimum structural unit of Corning gorilla series of amorphous aluminosilicate glass is explored by the cluster-plus-glue-atom (CPGA) model, preliminarily. Taking typical -tridymite () as the parent phase material, the cluster formula (CF) and unit cluster of are established as [Si-O]Si and [(CF)-(CF)](CF). The metal cations (MC, 2≤≤5 and ≠4) are the network former, which are introduced into [Si-O]MC structure. Besides, MC is also introduced into the amorphous aluminosilicate glass as network external, which keeps the sum valence of MC and MC as 4. In case of Corning gorilla series of amorphous aluminosilicate glass, the composition is firstly measured by Special Glass Key Laboratory of Hainan Province. Then, the unit clusters of Corning gorilla series of amorphous aluminosilicate glass are analyzed by CPGA model. The results reveal that the development trend mainly depends on the improvement of MC content, which is gradually improved from 4 to 10. Besides, CPGA unit clusters results of six generations amorphous aluminosilicate glass correspond well with the measurement results, which reflect the rationality of CPGA model. Based on CPGA unit cluster [(CF)-(CF)](CF), the upper limit of MC content for amorphous aluminosilicate glass is 12. So, CPGA unit clusters for next generation of amorphous aluminosilicate glass are designed, which could further improve MC content from 10 to 11. With the guidance of CPGA model, the amorphous aluminosilicate glass enterprise, as well as other kinds of glass enterprise, could avoid the huge research and development costs, as well long research and development time.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142269741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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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