Materials Science最新文献_第10页

Mechanisms of Pitting Corrosion of Austenitic Steels of Heat Exchangers in Circulating Waters and its Prediction 热交换器奥氏体钢在循环水中的点蚀机理及其预测

IF 0.9 4区材料科学

Materials Science Pub Date : 2024-03-08 DOI: 10.1007/s11003-024-00773-y

O. E. Narivs’kyi, S. O. Subbotin, T. V. Pulina, S. D. Leoshchenko, M. S. Khoma, N. B. Ratska

{"title":"Mechanisms of Pitting Corrosion of Austenitic Steels of Heat Exchangers in Circulating Waters and its Prediction","authors":"O. E. Narivs’kyi, S. O. Subbotin, T. V. Pulina, S. D. Leoshchenko, M. S. Khoma, N. B. Ratska","doi":"10.1007/s11003-024-00773-y","DOIUrl":"https://doi.org/10.1007/s11003-024-00773-y","url":null,"abstract":"<p>Mathematical models of the dependence of the critical pitting temperature (CPT) of AISI 304, AISI 321, 12Kh18N10T and 08Kh18N10 steels on their chemical composition, structural heterogeneity, as well as pH and chloride concentration of circulating water were developed. Models were based on quadratic regressions with first order partial derivatives and on polynomials with a reduced number of signs. By applying mathematical models, it was established that the pitting resistance of these steels increases with an increase in the average distance between oxides, the average diameter of austenite grain, specific magnetic susceptibility, the decrease in the volume of δ-ferrite and the number of the smallest oxides up to 1.98 μm in size. The positive effect of Cr and Mn on the pitting resistance of the studied steels was studied. Probably this occurred due to the increase of the solubility of N in austenite, reduction of the Fe atoms diffusion intensity to the surface of stable pittings and the increase of Cr to metastable pittings, contributing to their repassivation, which increased the pitting resistance of steels. The developed mathematical models are recommended for choosing optimal grades of austenitic steels and predicting their pitting resistance during operation of heat exchangers in circulating waters.</p>","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140075829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation and Characterization of C@Fe3O4 Supported Pd Magnetic Nanoparticles for Degradation of Dye Wastewater 用于降解染料废水的 C@Fe3O4 支持钯磁性纳米粒子的制备与表征

IF 0.9 4区材料科学

Materials Science Pub Date : 2024-02-19 DOI: 10.5755/j02.ms.34915

Xue Fang, Yang Wang, Xianghong Cui, Shumeng Zhou, Haijian Jiang, Meihuui Song, Liming Yao, Xiaochen Zhang

{"title":"Preparation and Characterization of C@Fe3O4 Supported Pd Magnetic Nanoparticles for Degradation of Dye Wastewater","authors":"Xue Fang, Yang Wang, Xianghong Cui, Shumeng Zhou, Haijian Jiang, Meihuui Song, Liming Yao, Xiaochen Zhang","doi":"10.5755/j02.ms.34915","DOIUrl":"https://doi.org/10.5755/j02.ms.34915","url":null,"abstract":"The core-shell structure Fe3O4@C magnetic nanoparticles were synthesized with superparamagnetic Fe3O4 nanosphere as a magnetic core, and soluble starch resin as a carbon source via a solvothermal method. Silica-iron oxide and Fe3O4@C carriers with a core-shell structure were prepared by carbonization of organic material on the surface of Fe3O4 nanoparticles, Fe3O4@C supported Pd were processed into magnetic nano-catalysts with core-shell structure, and their catalytic properties were investigated. The resulting environmentally friendly magnetic material can be used to degrade dye wastewater. The structure of magnetic nanoparticles was characterized using TEM, XRD and VSM. The effects of preparation conditions in the structure of the Fe3O4@C magnetic nanoparticles were taken out. The results indicate that from XRD, the magnetic nano particles Fe3O4@C synthesized of carbon sources have amorphous carbon diffraction peak except for all the characteristic peaks of Fe3O4. The saturation magnetization Fe3O4, Fe3O4@SiO2 and Fe3O4@C – 59.14 emu/g, 49.12 emu/g and 27.95 emu/g, respectively.","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140450437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Luminescence of Tm3+, Yb3+ Co-doped CaLaAlO4/LaAlO3 Mixed Phase Phosphor for Solid-state Lighting Application 用于固态照明应用的 Tm3+、Yb3+ 共掺杂 CaLaAlO4/LaAlO3 混合相荧光粉的发光特性

IF 0.9 4区材料科学

Materials Science Pub Date : 2024-02-15 DOI: 10.5755/j02.ms.35356

V. Igba, Marco Antonio GARCIA LOBATO, Carlos Eduardo Rodríguez García, Alejandro GARZA SANTIBÁÑEZ, J. OLIVA UC, E. HERNÁNDEZ-HERNÁNDEZ, E. VIESCA-VILLANUEVA

{"title":"Luminescence of Tm3+, Yb3+ Co-doped CaLaAlO4/LaAlO3 Mixed Phase Phosphor for Solid-state Lighting Application","authors":"V. Igba, Marco Antonio GARCIA LOBATO, Carlos Eduardo Rodríguez García, Alejandro GARZA SANTIBÁÑEZ, J. OLIVA UC, E. HERNÁNDEZ-HERNÁNDEZ, E. VIESCA-VILLANUEVA","doi":"10.5755/j02.ms.35356","DOIUrl":"https://doi.org/10.5755/j02.ms.35356","url":null,"abstract":"CaLaAlO4/LaAlO3: 0.5%Tm3+, xYb3+ upconversion phosphors were prepared via the combustion method. The Tm3+ dopant concentration was constant (Tm=0.5mol%), while the concentration of Yb3+ co-dopant was varied (Yb = 1 – 10 mol%). The X-ray diffraction studies indicated a mixture of phases (tetragonal and hexagonal of CaLaAlO4 and LaAlO3 respectively). The optical absorption spectra of the upconversion phosphors have two absorption bands centered at 253 nm, and another band at 440 nm. The band at 253 nm is ascribed to the charge transfer band (CTB) between the ligand (O2-) and Yb3+ ions, while the broad band located at 440 nm was related to defect states in the lattice. The energy bandgap and refractive index of the optimized phosphor were 4.73 eV and 1.76 respectively. The upconversion emission peaks centered at 478 nm (1G4 → 3H6), 654 nm (1G4 → 3F4), and 801 nm (3H4 → 3H6) are associated to the electronic transitions of Tm3+ ions. As the Yb concentration increases, the colour emission is tuned from bluish white to blue light. The CCT and CIE coordinate of (0.2419, 0.2463) showed that the phosphor doped with 10 mol% of Yb3+ produces a bluish-white and its colour purity was 80%. Thus, the strong bluish-white light emission produced by the CaLaAlO4/LaAlO3: 0.5%Tm3+, xYb3+ phosphors could be used for solid-state lighting (SSL) or in multicolour displays.","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139833989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Near-infrared Spectrum Characteristics of Micro-Nano Material Based Diffraction Optical Devices 基于微纳米材料的衍射光学器件的近红外光谱特性

IF 0.9 4区材料科学

Materials Science Pub Date : 2024-02-15 DOI: 10.5755/j02.ms.35151

Zhao Jin, Qiyao Xiao, Yue ZHANG, Cheng-Yuan Sun, Yongbo Deng, Chengmiao WANG, Qiang Fu, Yingchao Li, Huilin Jiang

{"title":"Near-infrared Spectrum Characteristics of Micro-Nano Material Based Diffraction Optical Devices","authors":"Zhao Jin, Qiyao Xiao, Yue ZHANG, Cheng-Yuan Sun, Yongbo Deng, Chengmiao WANG, Qiang Fu, Yingchao Li, Huilin Jiang","doi":"10.5755/j02.ms.35151","DOIUrl":"https://doi.org/10.5755/j02.ms.35151","url":null,"abstract":"Diffractive optics devices are optical devices in which the amplitude or phase of the incident light is spatially modulated periodically by a micro-nanomaterial based structure. The study of diffractive optics devices in the field of micro and nano can change the spectroscopic behavior of micro and nano diffractive optics devices by varying the microstructure of the structure and the optical wave properties, which can effectively and reasonably modulate the optical wave signal. To study the effect of different parameter structures on the performance of micro-nano diffraction optical devices, in this paper, two three-dimensional array structures of diffractive optical devices are proposed, which are a vertex-intersecting regular tetrahedron structure and a base-intersecting regular frustum structure. Using the Finite-Difference Time-Domain method, the spectroscopic images of the diffractive optics of the constructed micro-nano diffractive devices are studied in the near-infrared band by varying the height of the constructed structures, the type of structures, the wavelength of the incident light waves, and the polarization direction of the light waves in different 3D height coordinates. The effects of different parameter changes on the performance of the micro-nano diffractive optics devices were analyzed by image comparison. The results show that the best diffraction effect is achieved at a structure height of 0.9 μm for both models with different structure types. The study of both structures at this structure height reveals that the location of diffraction occurrence and the intensity of diffraction can be tuned by varying the structure and the relevant parameters such as the polarization of the light wave. This paper has some theoretical applications for the study of high-performance diffractive optics.","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139775030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Near-infrared Spectrum Characteristics of Micro-Nano Material Based Diffraction Optical Devices 基于微纳米材料的衍射光学器件的近红外光谱特性

IF 0.9 4区材料科学

Materials Science Pub Date : 2024-02-15 DOI: 10.5755/j02.ms.35151

Zhao Jin, Qiyao Xiao, Yue ZHANG, Cheng-Yuan Sun, Yongbo Deng, Chengmiao WANG, Qiang Fu, Yingchao Li, Huilin Jiang

{"title":"Near-infrared Spectrum Characteristics of Micro-Nano Material Based Diffraction Optical Devices","authors":"Zhao Jin, Qiyao Xiao, Yue ZHANG, Cheng-Yuan Sun, Yongbo Deng, Chengmiao WANG, Qiang Fu, Yingchao Li, Huilin Jiang","doi":"10.5755/j02.ms.35151","DOIUrl":"https://doi.org/10.5755/j02.ms.35151","url":null,"abstract":"Diffractive optics devices are optical devices in which the amplitude or phase of the incident light is spatially modulated periodically by a micro-nanomaterial based structure. The study of diffractive optics devices in the field of micro and nano can change the spectroscopic behavior of micro and nano diffractive optics devices by varying the microstructure of the structure and the optical wave properties, which can effectively and reasonably modulate the optical wave signal. To study the effect of different parameter structures on the performance of micro-nano diffraction optical devices, in this paper, two three-dimensional array structures of diffractive optical devices are proposed, which are a vertex-intersecting regular tetrahedron structure and a base-intersecting regular frustum structure. Using the Finite-Difference Time-Domain method, the spectroscopic images of the diffractive optics of the constructed micro-nano diffractive devices are studied in the near-infrared band by varying the height of the constructed structures, the type of structures, the wavelength of the incident light waves, and the polarization direction of the light waves in different 3D height coordinates. The effects of different parameter changes on the performance of the micro-nano diffractive optics devices were analyzed by image comparison. The results show that the best diffraction effect is achieved at a structure height of 0.9 μm for both models with different structure types. The study of both structures at this structure height reveals that the location of diffraction occurrence and the intensity of diffraction can be tuned by varying the structure and the relevant parameters such as the polarization of the light wave. This paper has some theoretical applications for the study of high-performance diffractive optics.","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139834706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of Novel Wear Equation of AA7050/SiC-Steel Interface for High Temperature Application 为高温应用开发新的 AA7050/SiC 钢界面磨损方程

IF 0.9 4区材料科学

Materials Science Pub Date : 2024-02-15 DOI: 10.5755/j02.ms.34486

Varghese Thaya Vijumon, J. J. JEBEEN MOSES, Poniface JOSE ALOYSIUS, Muthu Nadar FELIX XAVIER MUTHU

{"title":"Development of Novel Wear Equation of AA7050/SiC-Steel Interface for High Temperature Application","authors":"Varghese Thaya Vijumon, J. J. JEBEEN MOSES, Poniface JOSE ALOYSIUS, Muthu Nadar FELIX XAVIER MUTHU","doi":"10.5755/j02.ms.34486","DOIUrl":"https://doi.org/10.5755/j02.ms.34486","url":null,"abstract":"AA7050 aluminium alloy used for the main landing gear link was reinforced with SiC particles utilizing stir casting and uniform dispersion of reinforced particles was analyzed through SEM with EDS mapping. Wear test were performed on pin on disc apparatus by varying the process parameters and experimental runs were designed using response surface methodology. The influence of SiC particles on wear resistance at high temperatures was explored and the findings led to the development of a novel wear equation. The hardness of composites increased due to impediments of dislocation movement, and it declines with an increase in temperature owing to a reduction of Pierls stresses. The formation of a Mechanically Mixed Layer (MML) enhances wear resistance with the inclusion of reinforced particles, and the breakdown of this layer swifts the wear from moderate to severe. The mode of wear was a combination of shearing and abrasive at room temperature, shearing and adhesive until the temperature 200ᵒC, and plastic deformation when the temperature exceeded 200 °C, which was confirmed by worn surface morphology.","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139776316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of Novel Wear Equation of AA7050/SiC-Steel Interface for High Temperature Application 为高温应用开发新的 AA7050/SiC 钢界面磨损方程

IF 0.9 4区材料科学

Materials Science Pub Date : 2024-02-15 DOI: 10.5755/j02.ms.34486

Varghese Thaya Vijumon, J. J. JEBEEN MOSES, Poniface JOSE ALOYSIUS, Muthu Nadar FELIX XAVIER MUTHU

{"title":"Development of Novel Wear Equation of AA7050/SiC-Steel Interface for High Temperature Application","authors":"Varghese Thaya Vijumon, J. J. JEBEEN MOSES, Poniface JOSE ALOYSIUS, Muthu Nadar FELIX XAVIER MUTHU","doi":"10.5755/j02.ms.34486","DOIUrl":"https://doi.org/10.5755/j02.ms.34486","url":null,"abstract":"AA7050 aluminium alloy used for the main landing gear link was reinforced with SiC particles utilizing stir casting and uniform dispersion of reinforced particles was analyzed through SEM with EDS mapping. Wear test were performed on pin on disc apparatus by varying the process parameters and experimental runs were designed using response surface methodology. The influence of SiC particles on wear resistance at high temperatures was explored and the findings led to the development of a novel wear equation. The hardness of composites increased due to impediments of dislocation movement, and it declines with an increase in temperature owing to a reduction of Pierls stresses. The formation of a Mechanically Mixed Layer (MML) enhances wear resistance with the inclusion of reinforced particles, and the breakdown of this layer swifts the wear from moderate to severe. The mode of wear was a combination of shearing and abrasive at room temperature, shearing and adhesive until the temperature 200ᵒC, and plastic deformation when the temperature exceeded 200 °C, which was confirmed by worn surface morphology.","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139835945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Luminescence of Tm3+, Yb3+ Co-doped CaLaAlO4/LaAlO3 Mixed Phase Phosphor for Solid-state Lighting Application 用于固态照明应用的 Tm3+、Yb3+ 共掺杂 CaLaAlO4/LaAlO3 混合相荧光粉的发光特性

IF 0.9 4区材料科学

Materials Science Pub Date : 2024-02-15 DOI: 10.5755/j02.ms.35356

V. Igba, Marco Antonio GARCIA LOBATO, Carlos Eduardo Rodríguez García, Alejandro GARZA SANTIBÁÑEZ, J. OLIVA UC, E. HERNÁNDEZ-HERNÁNDEZ, E. VIESCA-VILLANUEVA

{"title":"Luminescence of Tm3+, Yb3+ Co-doped CaLaAlO4/LaAlO3 Mixed Phase Phosphor for Solid-state Lighting Application","authors":"V. Igba, Marco Antonio GARCIA LOBATO, Carlos Eduardo Rodríguez García, Alejandro GARZA SANTIBÁÑEZ, J. OLIVA UC, E. HERNÁNDEZ-HERNÁNDEZ, E. VIESCA-VILLANUEVA","doi":"10.5755/j02.ms.35356","DOIUrl":"https://doi.org/10.5755/j02.ms.35356","url":null,"abstract":"CaLaAlO4/LaAlO3: 0.5%Tm3+, xYb3+ upconversion phosphors were prepared via the combustion method. The Tm3+ dopant concentration was constant (Tm=0.5mol%), while the concentration of Yb3+ co-dopant was varied (Yb = 1 – 10 mol%). The X-ray diffraction studies indicated a mixture of phases (tetragonal and hexagonal of CaLaAlO4 and LaAlO3 respectively). The optical absorption spectra of the upconversion phosphors have two absorption bands centered at 253 nm, and another band at 440 nm. The band at 253 nm is ascribed to the charge transfer band (CTB) between the ligand (O2-) and Yb3+ ions, while the broad band located at 440 nm was related to defect states in the lattice. The energy bandgap and refractive index of the optimized phosphor were 4.73 eV and 1.76 respectively. The upconversion emission peaks centered at 478 nm (1G4 → 3H6), 654 nm (1G4 → 3F4), and 801 nm (3H4 → 3H6) are associated to the electronic transitions of Tm3+ ions. As the Yb concentration increases, the colour emission is tuned from bluish white to blue light. The CCT and CIE coordinate of (0.2419, 0.2463) showed that the phosphor doped with 10 mol% of Yb3+ produces a bluish-white and its colour purity was 80%. Thus, the strong bluish-white light emission produced by the CaLaAlO4/LaAlO3: 0.5%Tm3+, xYb3+ phosphors could be used for solid-state lighting (SSL) or in multicolour displays.","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139774439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improvement of Microwave Dielectric Properties by Impact of Sodium Ion Doping in Complex Oxides for Polymer Composites 通过在聚合物复合材料的复合氧化物中掺入钠离子改善微波介电性能

IF 0.9 4区材料科学

Materials Science Pub Date : 2024-02-13 DOI: 10.5755/j02.ms.35582

L. Faeq, S. Farid, F. A. Hashim

{"title":"Improvement of Microwave Dielectric Properties by Impact of Sodium Ion Doping in Complex Oxides for Polymer Composites","authors":"L. Faeq, S. Farid, F. A. Hashim","doi":"10.5755/j02.ms.35582","DOIUrl":"https://doi.org/10.5755/j02.ms.35582","url":null,"abstract":"The research presented in this study focuses on the dielectric properties of complex oxide-filled epoxy, polyurethane, and silicone rubber composites. Specifically, we investigated various compositions of (1-x) CaWO4-xNa2WO4 (x = 0, 0.2, 0.4), in addition to Na0.5Bi0.5Mo0.5W0.5O4 and Bi2Mo0.5W0.5O6. These complex oxide materials were meticulously synthesized through a solid-state reaction, and their distinct phases were confirmed via rigorous X-ray diffraction (XRD) characterization. We then proceeded to create the composites by manually blending these complex oxides with epoxy, polyurethane, and silicone rubber matrices. The central focus of the study was to examine the impact of varying volume fractions of the complex oxide fillers on the dielectric properties of the composites in the frequency range of 4 – 8 GHz.Our observations revealed a direct correlation between the content of the complex oxide filler and the dielectric properties, including the dielectric constant and dielectric loss. Specifically, the addition of 10 % by volume fraction of (1-x) CaWO4-xNa2WO4 (x = 0, 0.4), Na0.5Bi0.5Mo0.5W0.5O4, or Bi2Mo0.5W0.5O6 fillers to the respective polymer matrices led to a significant enhancement in both the dielectric constant and the loss tangent. Promising results were particularly evident in three composite formulations: the 10 % 0.4Na2WO4-0.6CaWO4/silicone rubber composite demonstrated a dielectric constant (εr) of 2.02 ´ 102 and a loss tangent (tanδ) of -4.07 ´ 10-1 at 7.1 GHz; the 10 % Na0.5Bi0.5Mo0.5W0.5O4/epoxy composite exhibited a dielectric constant of 1.37 ´ 102 and a loss tangent of -6.43 ´ 10-1 at 7.22 GHz; and the 10 % Bi2W0.5Mo0.5O6/polyurethane composite displayed favorable properties with a dielectric constant (ϵr) of 8.37x101 and a loss tangent (tanδ) of -3.4 ´ 10-1 at 7.12 GHz.These results suggest the suitability of these composite materials for a wide range of microwave technology applications, including wireless communication, radar systems, and various microwave devices.","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139780816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Additively Manufactured Stress-strain Dependant Frequency Reconfigurable Antenna for Pressure Sensor Applications 用于压力传感器应用的增材制造应力应变相关频率可重构天线

IF 0.9 4区材料科学

Materials Science Pub Date : 2024-02-13 DOI: 10.5755/j02.ms.34879

Deepa Nivethika Sivasubramani

{"title":"Additively Manufactured Stress-strain Dependant Frequency Reconfigurable Antenna for Pressure Sensor Applications","authors":"Deepa Nivethika Sivasubramani","doi":"10.5755/j02.ms.34879","DOIUrl":"https://doi.org/10.5755/j02.ms.34879","url":null,"abstract":"A novel additive-manufactured antenna for stretchable sensor application is designed, simulated and measured. The fully transparent antenna has air as a substrate and a conductive aluminium metal sheet as a patch. The layers are defined with thin Thermo Poly Urethane (TPU) material, as its flexible/stretchable property doesn't disturb the actual property of air. The air substrate is locked within the flexible TPU with a thickness of 200 microns, and the conducting patch is also dimensioned with the 3D printing method. The stretchable antenna is fabricated with 3D printing technology, considered a dielectric medium, and the conducting medium is a conducting aluminium sheet. Re-configurability is achieved with the pressure level applied over the air–substrate antenna. Hence, the minimal change in shape changes the dielectric constant, thus changing the antenna parameter and radiation pattern. The antenna achieves improved size and performance with a gain of 7.2 dB, a directivity of 7.574 dB, a radiation efficiency of 95.67 %, and a 12:509 front-to-back ratio. The fabricated antenna is tested for its resonant characteristics and radiation properties. This reconfigurable antenna can be used for various applications, including Wireless Local Area Network (WLAN) communication.","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139840507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0