Pub Date : 2022-09-06DOI: 10.1051/epjap/2022220208
Aiqiang Chen, Haoyan Zhang, Jianfei Song, Bin Liu, Chensi Zhang, P. Theodorakis
The liquid–vapor interface remains a key point for improving the heat transfer efficiency of heat exchangers. In this paper, we report experimental results on the evaporation of ethanol in capillary tubes of different internal cross-sections as the bulk meniscus recedes inside the tube, since the chosen conditions allow for the development of a liquid film along tube's internal corners due to the presence of capillary forces. To achieve our aims, we used 3D video microscopy to monitor the behavior of the meniscus during evaporation and, also, calculated the capillary pressures for three channels with different cross-sectional shapes each, namely circular, square and equilateral triangle cross-sections, for three solid–liquid contact angles, i.e., 30°, 60°, and 90°. At the same time, we have combined infrared thermal imaging technology with particle imaging velocimetry (PIV) visualization technology to analyze the severe Marangoni convection at the included angle. To this end, the interfacial temperature distribution of Marangoni convection was measured by means of an infrared camera and the flow pattern by means of PIV, respectively, through the plane in various views. For capillary tubes with included angle, the temperature gradient at the meniscus reaches its maximum at the included angle. Moreover, both temperature and convective gradients exist in the liquid film with included angle. When the angle of the capillary tube is smaller, the capillary effect will increase, leading to the formation of a thicker film. Our investigation constitutes an "extreme" experiment of Marangoni flow at the corners of the capillary tube. Due to the capillary forces, liquid films can rise in the corners of polygonal tubes up to the entrance of the tubes. Furthermore, the wetting force of ethanol at the angle of the triangle tube is much larger than that in the case of the square tube. Finally, the Marangoni vortex flows from the relatively high-temperature region in the center of the liquid towards the included angle, where evaporation is faster and the recharge of material and energy is more concentrated. We anticipate that our study sheds light into the meniscus shape and Marangoni flow in capillary tubes of with cross-sections of different shapes, which is of fundamental importance for various applications and in particular microfluidic systems.
{"title":"On the Meniscus Shape and Marangoni Flow in Capillary Tubes with Noncircular Cross-Section Shapes","authors":"Aiqiang Chen, Haoyan Zhang, Jianfei Song, Bin Liu, Chensi Zhang, P. Theodorakis","doi":"10.1051/epjap/2022220208","DOIUrl":"https://doi.org/10.1051/epjap/2022220208","url":null,"abstract":"The liquid–vapor interface remains a key point for improving the heat transfer efficiency of heat exchangers. In this paper, we report experimental results on the evaporation of ethanol in capillary tubes of different internal cross-sections as the bulk meniscus recedes inside the tube, since the chosen conditions allow for the development of a liquid film along tube's internal corners due to the presence of capillary forces. To achieve our aims, we used 3D video microscopy to monitor the behavior of the meniscus during evaporation and, also, calculated the capillary pressures for three channels with different cross-sectional shapes each, namely circular, square and equilateral triangle cross-sections, for three solid–liquid contact angles, i.e., 30°, 60°, and 90°. At the same time, we have combined infrared thermal imaging technology with particle imaging velocimetry (PIV) visualization technology to analyze the severe Marangoni convection at the included angle. To this end, the interfacial temperature distribution of Marangoni convection was measured by means of an infrared camera and the flow pattern by means of PIV, respectively, through the plane in various views. For capillary tubes with included angle, the temperature gradient at the meniscus reaches its maximum at the included angle. Moreover, both temperature and convective gradients exist in the liquid film with included angle. When the angle of the capillary tube is smaller, the capillary effect will increase, leading to the formation of a thicker film. Our investigation constitutes an \"extreme\" experiment of Marangoni flow at the corners of the capillary tube. Due to the capillary forces, liquid films can rise in the corners of polygonal tubes up to the entrance of the tubes. Furthermore, the wetting force of ethanol at the angle of the triangle tube is much larger than that in the case of the square tube. Finally, the Marangoni vortex flows from the relatively high-temperature region in the center of the liquid towards the included angle, where evaporation is faster and the recharge of material and energy is more concentrated. We anticipate that our study sheds light into the meniscus shape and Marangoni flow in capillary tubes of with cross-sections of different shapes, which is of fundamental importance for various applications and in particular microfluidic systems.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126909184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-02DOI: 10.1051/epjap/2022220105
M. Yessari, Najoua Fangachi, I. Salhi, M. Rguiti, A. Hajjaji
Vibration-based energy harvesting is a growing field for generating low-power electricity to use in wireless electronic devices. These applications are usually in an environment of abundant low frequency vibration, which can be collected through an appropriate energy conversion structure. However, traditional energy conversion architectures such as cantilever-cantilever type or spring-mass type have the problem of high working frequency and narrow bandwidth (limiting its use and far from the frequency found in the surrounding environment). To overcome these challenges, this work proposes a study of a piezoelectric vibration energy harvester based on a dual cantilever structure. The energy harvesting system is designed, analyzed and verified with the finite element analysis method and an experimental study. The results show that the bandwidth is enlarged of 30 Hz and a power is generated and equals to the sum of the power generated by each cantilever (190 nW) with an output voltage supplying a resistive load of 110 KΏ.
{"title":"Performance of a dual piezoceramic cantilever for low frequency energy harvesting applications: modeling and experiment verification","authors":"M. Yessari, Najoua Fangachi, I. Salhi, M. Rguiti, A. Hajjaji","doi":"10.1051/epjap/2022220105","DOIUrl":"https://doi.org/10.1051/epjap/2022220105","url":null,"abstract":"Vibration-based energy harvesting is a growing field for generating low-power electricity to use in wireless electronic devices. These applications are usually in an environment of abundant low frequency vibration, which can be collected through an appropriate energy conversion structure. However, traditional energy conversion architectures such as cantilever-cantilever type or spring-mass type have the problem of high working frequency and narrow bandwidth (limiting its use and far from the frequency found in the surrounding environment). To overcome these challenges, this work proposes a study of a piezoelectric vibration energy harvester based on a dual cantilever structure. The energy harvesting system is designed, analyzed and verified with the finite element analysis method and an experimental study. The results show that the bandwidth is enlarged of 30 Hz and a power is generated and equals to the sum of the power generated by each cantilever (190 nW) with an output voltage supplying a resistive load of 110 KΏ.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129016978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-29DOI: 10.1051/epjap/2022220031
Meena Kumari Sahu, P. Mallick, S. K. Satpathy, B. Behera
The composite, BiFeO3-LiVO3 was synthesized through a solid-state reaction technique. The X-ray diffraction (XRD) confirmed the formation of the tetragonal structure at room temperature. The dielectric constant and dielectric loss increases with rise in temperature. The Nyquist plot projected the contribution of bulk effect and a slight indication of grain boundary effect. The presence of a temperature-dependent relaxation process occurred in the material. Electrical modulus confirmed the non-Debye type and indicated the asymmetric peak broadening for the spread of relaxation times. The activation energies were calculated from the ac conductivity by linear fitting. The activation energy calculated from the complex impedance plot and the fitted Johnscher power law was very close which implied a similar type of charge carrier which exists in the conduction mechanism for the system. Thermistor parameters were evaluated using the grain resistance for different temperatures.
{"title":"Structural, dielectric, and electrical study of bismuth ferrite-lithium vanadate","authors":"Meena Kumari Sahu, P. Mallick, S. K. Satpathy, B. Behera","doi":"10.1051/epjap/2022220031","DOIUrl":"https://doi.org/10.1051/epjap/2022220031","url":null,"abstract":"The composite, BiFeO3-LiVO3 was synthesized through a solid-state reaction technique. The X-ray diffraction (XRD) confirmed the formation of the tetragonal structure at room temperature. The dielectric constant and dielectric loss increases with rise in temperature. The Nyquist plot projected the contribution of bulk effect and a slight indication of grain boundary effect. The presence of a temperature-dependent relaxation process occurred in the material. Electrical modulus confirmed the non-Debye type and indicated the asymmetric peak broadening for the spread of relaxation times. The activation energies were calculated from the ac conductivity by linear fitting. The activation energy calculated from the complex impedance plot and the fitted Johnscher power law was very close which implied a similar type of charge carrier which exists in the conduction mechanism for the system. Thermistor parameters were evaluated using the grain resistance for different temperatures.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121979905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-26DOI: 10.1051/epjap/2022220117
Khadija Chakar, C. Ennawaoui, M. El Mouden, A. Hajjaji
Hybrid photovoltaic thermal (PVT) collectors have assumed considerable importance for their dual-energy applicability which is presented in thermal and electrical form. The thermal behavior of the hybrid collector plays an ameliorative role in dissipating the heat generated in the cell, and this increases the electrical efficiency accordingly with the help of a coolant fluid (nanofluids).The contribution of this study is to evaluate the potential interest of nanofluids in the cooling system of a photovoltaic thermal system (PVT) by modeling and comparing the thermal conductivity of TiO2-Water, Cu-Water nanofluids and of TiO2/Cu-Water hybrid nanofluid, also their thermal capacity and viscosity. Programs have been developed with volume concentrations from 0% to 4% and from 0% to 10% with constant temperature and nanoparticles diameter. The results show that all thermophysical properties characterizing the heat transfer are more important in a hybrid nanofluid compared to the simple nanofluid, such us for a nanoparticle volume fraction of 3%, the thermal conductivity and thermal capacity increased by 32% and 0.23% respectively, for a volume fraction range of 0 to 10%, while they show an increase of 12% and 0.22% respectively, for a range of 0 to 4%. Eventually the model agreed with experimental results.
混合光电热(PVT)集热器以热和电两种形式表现出双能适用性，因此具有相当重要的意义。混合集热器的热行为在消散电池中产生的热量方面起着改善作用，并在冷却液(纳米流体)的帮助下相应地提高了电效率。本研究的贡献是通过模拟和比较TiO2-水、cu -水纳米流体和TiO2/ cu -水混合纳米流体的导热性、热容量和粘度，来评估纳米流体在光伏热系统(PVT)冷却系统中的潜在价值。在恒定温度和纳米颗粒直径下，体积浓度从0%到4%和从0%到10%的程序已经开发出来。结果表明，与简单纳米流体相比，混合纳米流体中表征传热的所有热物理性质都更为重要，例如当纳米颗粒体积分数为3%时，在体积分数为0 ~ 10%的范围内，导热系数和热容量分别增加32%和0.23%，而在体积分数为0 ~ 4%的范围内，导热系数和热容量分别增加12%和0.22%。最终，模型与实验结果一致。
{"title":"Hybrid Nanofluids Multi performance optimizations for the Cooling System coupling with Hybrid Photovoltaic Thermal Collectors","authors":"Khadija Chakar, C. Ennawaoui, M. El Mouden, A. Hajjaji","doi":"10.1051/epjap/2022220117","DOIUrl":"https://doi.org/10.1051/epjap/2022220117","url":null,"abstract":"Hybrid photovoltaic thermal (PVT) collectors have assumed considerable importance for their dual-energy applicability which is presented in thermal and electrical form. The thermal behavior of the hybrid collector plays an ameliorative role in dissipating the heat generated in the cell, and this increases the electrical efficiency accordingly with the help of a coolant fluid (nanofluids).The contribution of this study is to evaluate the potential interest of nanofluids in the cooling system of a photovoltaic thermal system (PVT) by modeling and comparing the thermal conductivity of TiO2-Water, Cu-Water nanofluids and of TiO2/Cu-Water hybrid nanofluid, also their thermal capacity and viscosity. Programs have been developed with volume concentrations from 0% to 4% and from 0% to 10% with constant temperature and nanoparticles diameter. The results show that all thermophysical properties characterizing the heat transfer are more important in a hybrid nanofluid compared to the simple nanofluid, such us for a nanoparticle volume fraction of 3%, the thermal conductivity and thermal capacity increased by 32% and 0.23% respectively, for a volume fraction range of 0 to 10%, while they show an increase of 12% and 0.22% respectively, for a range of 0 to 4%. Eventually the model agreed with experimental results.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129492429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-25DOI: 10.1051/epjap/2022220088
Jean Luc Bodnar, K. Mouhoubi, Jean Marc Vallet
Stimulated infrared thermography has already shown its possibilities concerning the heritage mural paintings conservation. However, the different colors of the pictorial layer can, in certain unfavorable cases, lead to artefacts detection. Moreover, the fragility of these works of art requires the least energetic analyzes possible. In the work presented here, we show that the association of an SVD analysis with stimulated infrared thermography, seems to allow on the one hand, a notable reduction of this disturbing optical effect. We show on the other hand, that it seems to allow an early detection of these defects and therefore a lower energy deposit on studied works of art.
{"title":"Examples of SVD decomposition contributions to the non-destructive testing of cultural heritage mural paintings using stimulated infrared thermography","authors":"Jean Luc Bodnar, K. Mouhoubi, Jean Marc Vallet","doi":"10.1051/epjap/2022220088","DOIUrl":"https://doi.org/10.1051/epjap/2022220088","url":null,"abstract":"Stimulated infrared thermography has already shown its possibilities concerning the heritage mural paintings conservation. However, the different colors of the pictorial layer can, in certain unfavorable cases, lead to artefacts detection. Moreover, the fragility of these works of art requires the least energetic analyzes possible. In the work presented here, we show that the association of an SVD analysis with stimulated infrared thermography, seems to allow on the one hand, a notable reduction of this disturbing optical effect. We show on the other hand, that it seems to allow an early detection of these defects and therefore a lower energy deposit on studied works of art.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123199680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-23DOI: 10.1051/epjap/2022220130
Hefdh aldeen Al-sharabi, F. Bouhlal, Khalid Bouiti, Meriem Bensmlali, N. Labjar, Ghita Amine Benabdellah, Abdelwahed Dahrouch, S. Laasri, M. El Mahi, El Mostapha Lotfi, Bouchaib El Otmani, S. El hajjaji
The efficacy of Rumex Nervosus Vahl Leaves Ethanolic extract (RNVLE) to inhibit C38 steel corrosion in one molar hydrochloric acid medium was examined using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. Polarization measurements revealed mixed-type inhibitor behavior. The inhibitory efficacy assessed by both polarization and (EIS) techniques was consistent, with an IE value of (96.0 %) and (95.5 %) at 2g/L of RNVLE, respectively. The RNVLE adsorption on the C38 metal surfaces in 1M HCl follows the Langmuir adsorption isotherm. The calculated free energy (G°ads equal to -16.1 KJ mol-1) explained that RNVLE controls the corrosion process by physisorption. The effect of immersion time was also investigated. This study demonstrated that RNVLE can be considered an excellent inhibitor up to 6 hours and after this time; it is considered a lower quality inhibitor although it still has sufficient inhibitory ability. SEM-EDX (Scanning Electron Microscopy and X-ray Energy Dispersive Spectroscopy) analysis revealed that the extract molecules adsorb on the metal's surface. These findings indicate that RNVLE can be used as an effective corrosion inhibitor for C38 steel in 1M HCl solution.
{"title":"Study of the corrosion inhibition of C38 steel in a 1M HCl medium by the etanoic extract of Rumex Nervosus Vahl leaves","authors":"Hefdh aldeen Al-sharabi, F. Bouhlal, Khalid Bouiti, Meriem Bensmlali, N. Labjar, Ghita Amine Benabdellah, Abdelwahed Dahrouch, S. Laasri, M. El Mahi, El Mostapha Lotfi, Bouchaib El Otmani, S. El hajjaji","doi":"10.1051/epjap/2022220130","DOIUrl":"https://doi.org/10.1051/epjap/2022220130","url":null,"abstract":"The efficacy of Rumex Nervosus Vahl Leaves Ethanolic extract (RNVLE) to inhibit C38 steel corrosion in one molar hydrochloric acid medium was examined using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. Polarization measurements revealed mixed-type inhibitor behavior. The inhibitory efficacy assessed by both polarization and (EIS) techniques was consistent, with an IE value of (96.0 %) and (95.5 %) at 2g/L of RNVLE, respectively. The RNVLE adsorption on the C38 metal surfaces in 1M HCl follows the Langmuir adsorption isotherm. The calculated free energy (G°ads equal to -16.1 KJ mol-1) explained that RNVLE controls the corrosion process by physisorption. The effect of immersion time was also investigated. This study demonstrated that RNVLE can be considered an excellent inhibitor up to 6 hours and after this time; it is considered a lower quality inhibitor although it still has sufficient inhibitory ability. SEM-EDX (Scanning Electron Microscopy and X-ray Energy Dispersive Spectroscopy) analysis revealed that the extract molecules adsorb on the metal's surface. These findings indicate that RNVLE can be used as an effective corrosion inhibitor for C38 steel in 1M HCl solution.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122419888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-17DOI: 10.1051/epjap/2022220197
D. Drissi, F. Goumrhar, R. Ahl Laamara
In this paper, we investigate, for the rst time, the effect of Rhoduim (Rh) and Technetium (Tc) on the electronic and magnetic properties of dilute magnetic semiconductor CeO2 using the Korringa-Kohn-Rostoker (KKR) method combined with the generalized gradient approximation (GGA). Three differents concentrations (x = 0:05; 0:10; 0:15) are considered. The energy diagram of density of states reveals that the dopent changes CeO2 from a non magnetic semaicondtor to ferromegnetic half metals. Furthermore, the energy variation ensures the stability of the ferromagnetic phase due to double exchange mechanism. The Curie of temperature are evaluated and are ell found to be above room temperature. The present findings model new potential candidates for spintronics.
{"title":"Tuning half metallic ferromagnetic character in Rh and Tc doping Cerium dioxide for spintronic applications","authors":"D. Drissi, F. Goumrhar, R. Ahl Laamara","doi":"10.1051/epjap/2022220197","DOIUrl":"https://doi.org/10.1051/epjap/2022220197","url":null,"abstract":"In this paper, we investigate, for the rst time, the effect of Rhoduim (Rh) and Technetium (Tc) on the electronic and magnetic properties of dilute magnetic semiconductor CeO2 using the Korringa-Kohn-Rostoker (KKR) method combined with the generalized gradient approximation (GGA). Three differents concentrations (x = 0:05; 0:10; 0:15) are considered. The energy diagram of density of states reveals that the dopent changes CeO2 from a non magnetic semaicondtor to ferromegnetic half metals. Furthermore, the energy variation ensures the stability of the ferromagnetic phase due to double exchange mechanism. The Curie of temperature are evaluated and are ell found to be above room temperature. The present findings \u0000model new potential candidates for spintronics.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133018680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-09DOI: 10.1051/epjap/2022220201
K. Bria, M. Ait El Fqih, A. Afkir, L. Jadoual, A. Kaddouri
The sputtering of vanadium particles at normal incidence wassimulated. The SRIM-code combined to a new ANGULAIR and SDTrimSPsimulation was employed to obtain the sputtering yields and the angular distribution of the atoms. The simulation was made for a large number of incident Kr+ions with 5 keV energy, letting the computer count the number of emitted particles in the solid angle. The angular distribution of differential sputtering yields of vanadium shows an over-cosine tendency.
{"title":"Angular Distribution of Particles Sputtered from the Vanadium Target by 5 keV Kr Ions: Simulation Study","authors":"K. Bria, M. Ait El Fqih, A. Afkir, L. Jadoual, A. Kaddouri","doi":"10.1051/epjap/2022220201","DOIUrl":"https://doi.org/10.1051/epjap/2022220201","url":null,"abstract":"The sputtering of vanadium particles at normal incidence wassimulated. The SRIM-code combined to a new ANGULAIR and SDTrimSPsimulation was employed to obtain the sputtering yields and the angular distribution of the atoms. The simulation was made for a large number of incident Kr+ions with 5 keV energy, letting the computer count the number of emitted particles in the solid angle. The angular distribution of differential sputtering yields of vanadium shows an over-cosine tendency.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126676922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The crystal structure, microstructure, dielectric properties and energy storage properties of Ba0.85Ca0.15Zr0.1Ti0.9O3 (BCZT) ceramics with various TiO2 (0%, 1%, 8%, 40%, 50%, 60%) addition ceramics were discussed. Although the perovskite structure remained in samples with low content of TiO2, the secondary phase Ba2Ti5.5O13 appeared in samples with high TiO2 content. According to SEM results, the addition of TiO2 resulted in a significant decrease in the average grain size. Wtih the addition of TiO2, the phase transition temperature, corresponding to Curie temperature (Tc) of BCZT ceramics shifts to lower temperature. Compared with the pure BCZT ceramic, the higher impedance and slimmer hysteresis loops were realized in ceramics with high TiO2 content. The relatively large energy storage density (Wrec ~0.52 J/cm3) together with energy storage efficiency (η ~74.84%) were achieved in ceramic with 40% TiO2 content. When the contentration of TiO2 further increases, the energy storage efficiency increased, but the energy storage density declined. The present research provides a method to improve the energy storage performance of BCZT ceramics.
{"title":"Electrical properties of Ba0.85Ca0.15Zr0.1Ti0.9O3 ceramics with TiO2 addition","authors":"Xianwei Wang, Shuying Chen, Yifan Liang, Bihui Zhang, Xiaoling Shi, Ruoyu Zhang, Yujia Shi, Ziyi Ren, R. Liu, Yanchun Hu, J. Shang, Shaoqian Yin","doi":"10.1051/epjap/2022220151","DOIUrl":"https://doi.org/10.1051/epjap/2022220151","url":null,"abstract":"The crystal structure, microstructure, dielectric properties and energy storage properties of Ba0.85Ca0.15Zr0.1Ti0.9O3 (BCZT) ceramics with various TiO2 (0%, 1%, 8%, 40%, 50%, 60%) addition ceramics were discussed. Although the perovskite structure remained in samples with low content of TiO2, the secondary phase Ba2Ti5.5O13 appeared in samples with high TiO2 content. According to SEM results, the addition of TiO2 resulted in a significant decrease in the average grain size. Wtih the addition of TiO2, the phase transition temperature, corresponding to Curie temperature (Tc) of BCZT ceramics shifts to lower temperature. Compared with the pure BCZT ceramic, the higher impedance and slimmer hysteresis loops were realized in ceramics with high TiO2 content. The relatively large energy storage density (Wrec ~0.52 J/cm3) together with energy storage efficiency (η ~74.84%) were achieved in ceramic with 40% TiO2 content. When the contentration of TiO2 further increases, the energy storage efficiency increased, but the energy storage density declined. The present research provides a method to improve the energy storage performance of BCZT ceramics.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115699220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-02DOI: 10.1051/epjap/2022220110
El mahdi Bouiri, R. Farhan, N. Chakhchaoui, K. Oumghar, Cenk Denktaş, A. Eddiai, M. Meddad, M. Mazroui, O. Cherkaoui, Lhaj El Hachemi Omari
Although polylactic acid (PLA) is widely identified as a biodegradable polymer, its use is limited due to the inherently poor mechanical properties. Therefore, the strengthening of PLA with microscale particles like lead zirconate titanate (PZT) is a promising field of research that has only just begun to be explored. Piezoelectric polymer-PZT films are encouraging materials for modern applications. PLA/PZT composites have been elaborated with diverse content of PZT employing a solvent casting technique. The mechanical characteristics and dielectric properties of the considered films were investigated. X-ray Diffraction (XRD). Fourier Transform Infrared (FTIR) Spectroscopy and Scanning Electron Microscopy (SEM) were used to examine the influence of these fillers at the molecular level, crystal structural change, micro charges dispersion inside the polymer matrix, and Thermogravimetric Analysis (TGA) was used to examine the stability and thermal degradation of the films. The change in these properties as a function of content (0.1–1 wt. %) of PZT has also been investigated. It is found that the PZT incorporation induces a considerable influence on the transformation of the α→β phase. The result can lead to a significant improvement in the dielectric and piezoelectric properties of PLA/PZT composite.
{"title":"Improving dielectric properties of composites thin films with polylactic acid and PZT microparticles induced by interfacial polarization","authors":"El mahdi Bouiri, R. Farhan, N. Chakhchaoui, K. Oumghar, Cenk Denktaş, A. Eddiai, M. Meddad, M. Mazroui, O. Cherkaoui, Lhaj El Hachemi Omari","doi":"10.1051/epjap/2022220110","DOIUrl":"https://doi.org/10.1051/epjap/2022220110","url":null,"abstract":"Although polylactic acid (PLA) is widely identified as a biodegradable polymer, its use is limited due to the inherently poor mechanical properties. Therefore, the strengthening of PLA with microscale particles like lead zirconate titanate (PZT) is a promising field of research that has only just begun to be explored. Piezoelectric polymer-PZT films are encouraging materials for modern applications. PLA/PZT composites have been elaborated with diverse content of PZT employing a solvent casting technique. The mechanical characteristics and dielectric properties of the considered films were investigated. X-ray Diffraction (XRD). Fourier Transform Infrared (FTIR) Spectroscopy and Scanning Electron Microscopy (SEM) were used to examine the influence of these fillers at the molecular level, crystal structural change, micro charges dispersion inside the polymer matrix, and Thermogravimetric Analysis (TGA) was used to examine the stability and thermal degradation of the films. The change in these properties as a function of content (0.1–1 wt. %) of PZT has also been investigated. It is found that the PZT incorporation induces a considerable influence on the transformation of the α→β phase. The result can lead to a significant improvement in the dielectric and piezoelectric properties of PLA/PZT composite.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129585935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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