MaterialsPub Date : 2025-02-06DOI: 10.3390/ma18030721
Alexandra Ioana Danila, Daniel Breban-Schwarzkopf, Ecaterina Daescu, Iustin Olariu, Stefania Dinu
{"title":"Systematic Review of the Quality of Stereolithographic Three-Dimensionally Printed Materials for Provisional Dental Restorations.","authors":"Alexandra Ioana Danila, Daniel Breban-Schwarzkopf, Ecaterina Daescu, Iustin Olariu, Stefania Dinu","doi":"10.3390/ma18030721","DOIUrl":"10.3390/ma18030721","url":null,"abstract":"<p><strong>Background and objectives: </strong>The use of stereolithographic (SLA) 3D printing technology in dentistry has expanded, particularly for the fabrication of provisional dental restorations. Understanding the mechanical properties and quality of SLA 3D-printed materials is essential to ensure clinical success and patient safety. This systematic review aims to critically evaluate and summarize the available evidence on the mechanical properties and quality of SLA 3D-printed materials.</p><p><strong>Methods: </strong>A comprehensive literature search was conducted in PubMed, Scopus, Embase, Cochrane, and Web of Science up to October 2024. Studies comparing the mechanical properties of SLA 3D-printed provisional restoration materials with those of milled, conventional, or other additive manufacturing methods were included. Nine studies met the inclusion criteria. Data on flexural strength, hardness, fracture resistance, surface roughness, marginal adaptation, accuracy, cement film thickness, shear bond strength, and biofilm formation were extracted and analyzed.</p><p><strong>Results: </strong>The findings from the included studies indicate that SLA 3D-printed materials exhibit varied mechanical properties. Some studies reported that SLA 3D-printed resins had significantly lower flexural strength and hardness compared to milled PMMA and bis-acrylic resins. Other studies found that SLA 3D-printed resins showed clinically acceptable marginal adaptation, surface roughness, and fracture strength comparable to those fabricated by subtractive manufacturing and conventional methods. In terms of accuracy, build orientation influenced the dimensional accuracy of SLA-printed restorations. Studies assessing cement film thickness found that SLA-printed provisional restorations had higher cement film thickness compared to other materials. Regarding repairability and fatigue resistance, limitations were observed in some SLA resins.</p><p><strong>Conclusions: </strong>The mechanical properties and quality of SLA 3D-printed materials for provisional dental restorations vary among studies. While SLA technology holds promise for efficient fabrication of provisional restorations, inconsistencies in material properties suggest a need for further research to optimize materials and printing parameters. Standardization of protocols is necessary to ensure reliable clinical performance of SLA 3D-printed provisional restorations.</p>","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11821132/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
MaterialsPub Date : 2025-02-06DOI: 10.3390/ma18030708
Julien Jaume, Marie-Line Délia, Régine Basséguy
{"title":"The Influence of Roughness on the Protective Layer Formation Induced by Marine Microorganisms on 5083 Aluminum Alloy.","authors":"Julien Jaume, Marie-Line Délia, Régine Basséguy","doi":"10.3390/ma18030708","DOIUrl":"10.3390/ma18030708","url":null,"abstract":"<p><p>This study investigates the formation of a protective layer on a 5083 aluminum alloy surface induced by microorganisms from salt marsh. The influence of the initial surface roughness was examined to identify optimal conditions for maximum coverage and thickness of the protective layer. As two opposing effects are suspected, where high surface roughness enhances bacterial adhesion but reduces the resistance to abiotic corrosion, various degrees of roughness were tested. Using electrochemical experiments (OCP measurement, 1/Rp determination, and pitting sensitivity), SEM/TEM observation and EDX characterization, a compromise was found on the initial roughness to obtain a thick protective layer through good bacterial adhesion while minimizing abiotic corrosion. The optimal roughness, achieved through 240-grit grinding, facilitates a uniform distribution of microorganisms and the development of a dense, evenly thick protective layer that significantly enhances the alloy's resistance to pitting corrosion. The passivity domain doubled when comparing the electrochemical behavior of electrodes immersed in the presence of microbial activity to those immersed without it.</p>","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11820449/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
MaterialsPub Date : 2025-02-06DOI: 10.3390/ma18030718
Xuewen Chen, Qiang Li, Bingqi Liu, Shiqi Zhao, Lei Sun, Hao Yi
{"title":"Identification of Dynamic Recrystallization Model Parameters for 40CrMnMoA Alloy Steel Using the Inverse Optimization Method.","authors":"Xuewen Chen, Qiang Li, Bingqi Liu, Shiqi Zhao, Lei Sun, Hao Yi","doi":"10.3390/ma18030718","DOIUrl":"10.3390/ma18030718","url":null,"abstract":"<p><p>The microstructure of 40CrMnMoA during hot forging determines its macroscopic mechanical properties. Dynamic recrystallization (DRX) behavior is commonly used to refine grains and improve the microstructure of materials; therefore, it is important to be able to predict mechanical behavior during hot forging and the microstructure evolution during dynamic recrystallization. In order to accurately determine the DRX model parameters of 40CrMnMoA steel, an inverse optimization method is proposed in this work. The uniaxial isothermal compression experiment of 40CrMnMoA steel was carried out on a Gleeble-1500D thermal simulation tester (Dynamic Systems Inc. (DSI), Poestenkill, NY, USA) under the temperature range of 900~1200 °C and the strain rate range of 0.005 to 5 s<sup>-1</sup>. Based on the true stress-strain data obtained by a compression test, the DRX model of 40CrMnMoA was initially established using the traditional averaging method. Subsequently, the DRX model parameters calculated by the conventional averaging method were used as the initial values, the mean-square error between the experimental and calculated values of the DRX volume fraction was set as the objective function, and the DRX model parameters were optimized by the adaptive simulated annealing (ASA) algorithm. By comparing the correlation coefficient <i>R</i>, average absolute relative error (<i>AARE</i>), and the root mean square error (<i>RMSE</i>) of the predicted DRX percentage with the experimental values before and after optimization, it was found that the optimized model achieved an <i>R</i>-value of 0.992, with <i>AARE</i> and <i>RMSE</i> decreased by 34% and 2%, respectively, which verified the accuracy of the optimized DRX model. Through the program's secondary development, the optimized DRX model of 40CrMnMoA was integrated into finite element software Forge<sup>®</sup> 3.2 to simulate the isothermal compression process. The comparison between grain size from the central region of simulation results and actual samples revealed that the relative error is less than 3%. This result demonstrated that the inverse optimization method can accurately identify the DRX model parameters of 40CrMnMoA alloy steel.</p>","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11820613/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
MaterialsPub Date : 2025-02-06DOI: 10.3390/ma18030719
Haiping Tang, Yaping Ding, Guangyou Qiu, Pei Yi, Ziguang Liu
{"title":"Numerical Study on the In-Service Welding Stress of X80 Steel Natural Gas Pipeline.","authors":"Haiping Tang, Yaping Ding, Guangyou Qiu, Pei Yi, Ziguang Liu","doi":"10.3390/ma18030719","DOIUrl":"10.3390/ma18030719","url":null,"abstract":"<p><p>In this study, the welding stress of in-service welding on the X80 steel pipeline was investigated using the 3D finite element method. The parameters of heat source and axial and hoop welding stress were verified in the experiment. As shown in the results, in the heat-affected-zone (HAZ) location of the pipeline and sleeve, the outer wall was predominantly under compressive stress, while the inner wall was mainly subjected to tensile stress. The hoop stress (<i>σ<sub>h</sub></i>) is greater than the axial stress (<i>σ<sub>a</sub></i>). The maximum hoop stress is primarily concentrated at the connection point between the fillet weld and the sleeve, and its value exceeds the yield strength of X80 steel. Excluding the start-end region, the axial stress distributed in the circumferential direction remains at an almost constant value. The hoop stress values exhibit an approximately symmetric distribution, with relatively higher values at 0° and 180° and relatively lower values at 90° and 270°. Compared with axial stress, the influence of natural gas pressure and flow rate on the hoop stress of the pipeline is more pronounced. When the natural gas pressure increases from 0.5 MPa to 2.5 MPa and the flow rate increases from 1 m/s to 20 m/s, the hoop stress of the pipeline increases by 3.18% and 15.42%, respectively. Moreover, the influence of the preheating temperature on the axial stress of the sleeve is highly prominent. When the preheating temperature is elevated from 20 °C to 300 °C, the axial welding stress of the sleeve increases by 115.3%. These results indicate that maintaining the natural gas pressure at 1 MPa, keeping the flow rate below 12 m/s, and controlling the preheating temperature at approximately 50 °C can enhance the performance of the fillet weld during the in-service welding of X80 steel pipelines.</p>","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11819911/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
MaterialsPub Date : 2025-02-06DOI: 10.3390/ma18030726
Christina Kolokytha, Nektarios N Lathiotakis, Andreas Kaltzoglou, Ioannis D Petsalakis, Demeter Tzeli
{"title":"The Effect of A-Cation and X-Anion Substitutions on the Electronic and Structural Properties of A<sub>2</sub>ZrX<sub>6</sub> 'Defect' Perovskite Materials: A Theoretical Density Functional Theory Study.","authors":"Christina Kolokytha, Nektarios N Lathiotakis, Andreas Kaltzoglou, Ioannis D Petsalakis, Demeter Tzeli","doi":"10.3390/ma18030726","DOIUrl":"10.3390/ma18030726","url":null,"abstract":"<p><p>In the present work, nine 'defect' perovskites with the chemical formula A<sub>2</sub>ZrX<sub>6</sub> have been studied, where the A-site cations are a methylammonium cation, formamidinium cation, and trimethyl-sulfonium cation and the X-site anions are halogen, X = Cl, Br, and I. We employ periodic DFT calculations using GGA-PBE, MBJ, HSEsol, and HSE06 functionals. All studied compounds exhibit a wide-bandgap energy that ranges from 5.22 eV to 2.11 eV, while for some cases, geometry optimization led to significant structural modification. It was found that the increase in the halogen size resulted in a decrease in the bandgap energy. The choice of the organic A-site cation affects the bandgap as well, which is minimal for the methylammonium cation. Such semiconductors with organic cations may be utilized in optoelectronic devices, given the substantial benefit of solution processability and thin film formation compared to purely inorganic analogs, such as Cs<sub>2</sub>ZrX<sub>6</sub>.</p>","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11820960/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
MaterialsPub Date : 2025-02-06DOI: 10.3390/ma18030710
Xiaona Ren, Yao Wang, Zhenfan Wang, Peng Wang, Zihao Wang, Lebiao Yang, Weifeng Qi, Xinggang Li, Changchun Ge
{"title":"Properties of Electrode Induction Melting Gas Atomization- and Vacuum Induction Melting Atomization-Produced Powders and Their As-HIPed Blanks.","authors":"Xiaona Ren, Yao Wang, Zhenfan Wang, Peng Wang, Zihao Wang, Lebiao Yang, Weifeng Qi, Xinggang Li, Changchun Ge","doi":"10.3390/ma18030710","DOIUrl":"10.3390/ma18030710","url":null,"abstract":"<p><p>The main method for large-scaled preparing powder superalloys in the production process is inert gas atomization, particularly vacuum-induced gas atomization (VIGA). A novel technique called electrode-induced gas atomization (EIGA) with a crucible-free electrode was proposed to prepare non-inclusion superalloy powders. In this study, a Ni-based superalloy of FGH4096 powder was prepared using both the VIGA and EIGA methods, while blanks were prepared through direct hot isostatic pressing (as-HIPed) near-net-forming method. The particle size, morphology, microstructure, and mechanical properties of the powders and blanks were compared via a laser particle size analyzer, SEM, TEM, and room-temperature and 650 °C tensile tests. The results indicated that EIGA-prepared powders exhibited a finer particle size and better surface quality than the one prepared via VIGA, which showed reduced satellite powders. However, the as-HIPed blank of EIGA-prepared powders had a lower secondary γ' ratio and slightly reduced strength compared to the as-HIPed blank of VIGA-prepared powders due to its slightly lower secondary γ' phase ratio and less effective inhibition of dislocation movement. Furthermore, the overall performance of the two samples did not differ significantly due to the similar microstructural characteristics of the powders. However, the variation in particle size affects heat conduction during the HIP process, resulting in slight differences in blanks' properties.</p>","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11820209/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
MaterialsPub Date : 2025-02-06DOI: 10.3390/ma18030727
Eri Yoshida
{"title":"Protein Cage-like Vesicles Fabricated via Polymerization-Induced Microphase Separation of Amphiphilic Diblock Copolymers.","authors":"Eri Yoshida","doi":"10.3390/ma18030727","DOIUrl":"10.3390/ma18030727","url":null,"abstract":"<p><p>Highly symmetric protein cages represent one of the most artistic architectures formed by biomolecules. However, the underlying reasons for the formation of some of these architectures remain unknown. The present study aims to investigate the significance behind their morphological formation by fabricating protein cage-like vesicles using a synthetic polymer. The vesicles were synthesized by combining polymerization-induced self-assembly (PISA) with polymerization-induced microphase separation (PIMS), employing an amphiphilic poly(methacrylic acid)-<i>block</i>-poly(<i>n</i>-butyl methacrylate-<i>random</i>-cyclohexyl methacrylate-<i>random</i>-methacrylic acid) diblock copolymer, PMAA-<i>b</i>-P(BMA-<i>r</i>-CMA-<i>r</i>-MAA). The copolymer, with a 60 mol% molar ratio of CMA to the BMA units, produced clathrin-like vesicles with angular windows in their shell, resulting from the segregation of the hard CMA units from the soft BMA matrix in the hydrophobic phase of the vesicle. These vesicles were highly stable against rising temperatures. In contrast, the vesicles with a 30 mol% CMA ratio dissociated upon heating to 50 °C into triskelion-like segments due to intramolecular microphase separation. These findings indicate that designing synthetic polymers can mimic living organ morphologies, aiding in elucidating their morphological significance and inspiring the development of new materials utilizing these morphologies.</p>","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11820364/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
MaterialsPub Date : 2025-02-06DOI: 10.3390/ma18030725
Xi Xu, Yuewu Wang
{"title":"Vibration Control of AFG Beam with Moving Load in Thermal Environment.","authors":"Xi Xu, Yuewu Wang","doi":"10.3390/ma18030725","DOIUrl":"10.3390/ma18030725","url":null,"abstract":"<p><p>Forced vibrations resulting from moving loads, along with efficient vibration control, are essential in transportation engineering, earthquake engineering, and aerospace engineering. In this study, the vibrational response of an axially functionally graded (AFG) beam subjected to a moving harmonic load within a thermal environment was investigated. The primary aim was to explore the potential of controlling this vibration by incorporating a nonlinear energy sink (NES). A model for the AFG beam, with clamped-clamped boundary conditions, was developed using Euler-Bernoulli beam theory and the Lagrange method, accounting for the effects of the thermal environment and the moving load. The numerical simulations were performed using the Newmark method to solve the governing equations. The results demonstrated the effectiveness of the NES in mitigating the vibrational response of the beam under thermal and dynamic loading conditions. The effective reduction of maximum deflection caused by moving loads was set as the optimization objective to identify the most optimal parameters of the NES. The results were presented through a series of parameter analyses, revealing that the nonlinear damper can quickly dissipate the beam's energy when the loads exit the structure. Furthermore, a properly designed NES can result in a 2.4-fold increase in suppression efficiency.</p>","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11820467/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143409095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
MaterialsPub Date : 2025-02-06DOI: 10.3390/ma18030707
Dongyun Wang, Xuan Shen, Zhiyan Wang, Xiucheng Zhang, Xue-Fei Chen
{"title":"Effect of Quicklime Substitution for Cement on the Physical and Mechanical Properties of Autoclaved Fly Ash Aggregates via Hydrothermal Synthesis.","authors":"Dongyun Wang, Xuan Shen, Zhiyan Wang, Xiucheng Zhang, Xue-Fei Chen","doi":"10.3390/ma18030707","DOIUrl":"10.3390/ma18030707","url":null,"abstract":"<p><p>Herein, we synthesized fly ash aggregates (FAAs) through a hydrothermal synthesis process utilizing fly ash, quicklime, and cement under saturated steam conditions at 180 °C. We systematically investigated the influence and mechanisms governing the physical and mechanical properties of autoclaved FAAs by incrementally replacing cement with quicklime in 5% equal mass intervals. Our results revealed that the substitution of cement with quicklime yielded lightweight aggregates (LWAs) exhibiting water absorption ranging from 1.33% to 22.88% after 1 h and 1.67% to 26.22% after 24 h, loose bulk densities between 847 kg/m<sup>3</sup> and 1043 kg/m<sup>3</sup>, apparent densities spanning from 1484 kg/m<sup>3</sup> to 1880 kg/m<sup>3</sup>, and cylinder compressive strengths varying from 11.9 MPa to 18.5 MPa. Notably, as the proportion of quicklime substitution for cement increased, there was a corresponding augmentation in water consumption during granulation, resulting in an elevated water-cement ratio ranging from 27.5% to 51.39%. This led to an enhancement in the water absorption of the FAAs, accompanied by a decrement in cylinder compressive strength and overall density. The hydration products, including tobermorite and calcium silicate hydrate, contributed to the creation of a dense microstructure within the FAAs. However, with higher quantities of quicklime replacing cement, the content of hydration products increased while the proportion of unreacted fly ash particles decreased significantly. The resultant weakening micro-aggregate effect emerged as a pivotal factor contributing to the observed decrement in the strength of these FAAs. The findings of this research are anticipated to provide significant theoretical insights and technical support for the selection of calcareous materials in the resource-recycling process of fly ash.</p>","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11821106/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
MaterialsPub Date : 2025-02-06DOI: 10.3390/ma18030717
Besarta Cheliku Ramadani, Jeta Sela, Leon Stojanov, Sofija Popovska, Valentin Mirčeski, Miha Bukleski, Sandra Dimitrovska-Lazova, Arianit A Reka, Slobotka Aleksovska
{"title":"Synthesis, Characterization, and Electrocatalytic Properties of PrMn<sub>0.5</sub>M<sub>0.5</sub>O<sub>3</sub> (M = Cr, Fe, Co, Ni) Perovskites.","authors":"Besarta Cheliku Ramadani, Jeta Sela, Leon Stojanov, Sofija Popovska, Valentin Mirčeski, Miha Bukleski, Sandra Dimitrovska-Lazova, Arianit A Reka, Slobotka Aleksovska","doi":"10.3390/ma18030717","DOIUrl":"10.3390/ma18030717","url":null,"abstract":"<p><p>In this paper, the synthesis, characterization, and investigation of electrocatalytic properties of perovskites of general formula PrMn<sub>0.5</sub>M<sub>0.5</sub>O<sub>3</sub> (M = Cr, Fe, Co, Ni) are presented. The synthesis was conducted by the solution combustion method using glycine as a fuel. The perovskite with the formula PrMn<sub>0.5</sub>Fe<sub>0.5</sub>O<sub>3</sub> was also synthesized by the sol-gel combustion method with citric acid as fuel. The obtained perovskites were investigated by X-ray powder diffraction (XRPD), scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDX), infrared spectroscopy, and cyclic voltammetry. The XRPD patterns showed that the compounds are pure and isostructural within the series. The unit cell parameters of the compounds were determined within the <i>Pnma</i> space group, and several crystallochemical parameters were calculated and discussed. The recorded SEM images of the perovskites revealed a porous morphology, while the EDX analysis confirmed the 2:1:1 atomic percentage ratio of Pr:Mn:M. Within this investigation, the electrocatalytic properties of the obtained perovskites towards oxidation of OH<sup>-</sup> ions and H<sub>2</sub>O<sub>2</sub> oxidation in phosphate buffer were studied by cyclic voltammetry, using a paraffin-impregnated graphite electrode (PIGE) modified with microcrystals of the investigated perovskites. PrMn<sub>0.5</sub>Fe<sub>0.5</sub>O<sub>3</sub> showed high electrocatalytic activity for OH<sup>-</sup> oxidation, while both PrMn<sub>0.5</sub>Fe<sub>0.5</sub>O<sub>3</sub> and PrMn<sub>0.5</sub>Co<sub>0.5</sub>O<sub>3</sub> exhibited significant efficiency for H<sub>2</sub>O<sub>2</sub> oxidation, with a distinct oxidation peak with a peak potential of 0.6 V.</p>","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11820077/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}