International Journal of Mechanical and Materials Engineering最新文献

{"title":"Photocurrent generation using ZnO/CuO/Ag heterojunction films","authors":"Joseff Renato Mejia-Bernal,&nbsp;Christian Gómez-Solís,&nbsp;I. Juárez-Ramírez,&nbsp;G. Ortiz-Rabell,&nbsp;L. A. Díaz-Torres","doi":"10.1186/s40712-025-00217-8","DOIUrl":"10.1186/s40712-025-00217-8","url":null,"abstract":"<div><p>The preparation of heterojunctions in semiconductor films has generated great interest in the field of photocatalysis due to the unique physicochemical properties and a special electronic band structure formed. Particularly, in this work, we show the heterojunction synthesis of ZnO/CuO/Ag films deposited on glass substrates. These films were prepared by the sol–gel method coupled with the spin-coating technique, which is an easy, simple, and economical option to prepare films compared to other reported methods. According to the results obtained, the presence of CuO and Ag on the ZnO surface favored the better separation of the photogenerated electron–hole pair, as well as a better visible light absorbance compared to pure ZnO and CuO. The characterization of the films was carried out by X-ray diffraction and scanning electron microscopy techniques to know the structural and morphological parameters, respectively, while through UV–Vis analysis, it was possible to determine the bandgap energy value of the films through the Tau plot. Likewise, by means of photoluminescence analysis, it was possible to observe an improvement in charge transfer, thus avoiding the rapid recombination of the photogenerated electron–hole pair. Finally, photoelectrochemical tests (PEC) for photocurrent generation showed an improvement for the ZnO/CuO/Ag heterojunction film (0.78 mA/cm²), almost five times greater than ZnO (0.15 mA/cm²), respectively, which is caused by the increased electron transport that is linked to the longer lifetime of the charge carriers with an effective separation of the electron–hole pair and a fast diffusion rate.</p></div>","PeriodicalId":592,"journal":{"name":"International Journal of Mechanical and Materials Engineering","volume":"20 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://jmsg.springeropen.com/counter/pdf/10.1186/s40712-025-00217-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143612268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of mode of metal transfer on corrosion properties of duplex stainless steel welding","authors":"Chintan Bahadursinh Gohil,&nbsp;Sanjay Narhar Soman","doi":"10.1186/s40712-024-00194-4","DOIUrl":"10.1186/s40712-024-00194-4","url":null,"abstract":"<div><p>Gas metal arc welding process used to develop butt welding on 8-mm plates of EN 1.4462 (2205) grade to meet higher productivity and excellent corrosion properties by using the dip or short circuit, globular, and spray modes of metal transfer. General corrosion behavior was determined by potentiodynamic in 0.1%N H₂SO₄ solution, while pitting corrosion susceptibility was studied by cyclic polarization test in 6% FeCl₃ solution. Pitting and crevice corrosion tests were performed as per ASTM G48 method A and B, respectively. The findings demonstrate that the specimen welded with spray transfer mode was found without any pitting on the surface with the lowest weight loss of 0.000005 g/cm² and 0.000109 g/cm² in the pitting and crevice test, respectively. No intermetallic phase was observed in optical microscopy up to 500 × for all modes of metal transfer specimens. The dip transfer mode sample shows the lowest corrosion rate at 2.310 mpy and 37.91 in potentiodynamic and cyclic polarization studies demonstrating very good general corrosion and pitting potential. The highest volume ferrite % was observed in the heat-affected zone than weld and base metal for all samples. However, the dip transfer mode specimen shows the highest % ferrite of 68.21%, 59.37%, and 51.02% in the heat-affected zone and weld and base metal. Spray transfer mode is recommended to weld 8-mm plates for welding joints for welding similar types of applications and testing media.</p></div>","PeriodicalId":592,"journal":{"name":"International Journal of Mechanical and Materials Engineering","volume":"20 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://jmsg.springeropen.com/counter/pdf/10.1186/s40712-024-00194-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143602378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of EDTA at pH = 7 on oxidized NiMo/Zr-SBA-15 catalysts oriented to hydrodesulfurization processes","authors":"Diego Alejandro García-Ramos,&nbsp;Rebeca Silva-Rodrigo,&nbsp;Amelia Olivas-Sarabia,&nbsp;José Aarón Melo-Banda,&nbsp;Acela López-Benítez,&nbsp;Alfredo Guevara-Lara","doi":"10.1186/s40712-025-00244-5","DOIUrl":"10.1186/s40712-025-00244-5","url":null,"abstract":"<div><p>This study reports the beneficial effect of EDTA insertion at neutral pH on oxidized NiMo catalysts supported on Zr-SBA-15 with a theoretical molar ratio of Zr/Si = 0.07, synthesized by the sol–gel method. The support was impregnated with the precursor solutions of nickel nitrate and ammonium molybdate in order to obtain NiMo bimetallic catalysts with a theoretical molar ratio of Ni/(Ni + Mo) = 0.3. In addition, EDTA was incorporated as a chelating agent during the impregnation step with a theoretical molar ratio of Ni: EDTA = 1:1 adjusting the pH to neutral. The bimetallic catalysts were characterized at each step of the preparation (drying and calcination). XRD, N₂ physisorption, and TEM analyses demonstrated that the incorporation of metals did not considerably affect the mesoporous morphology, as evidenced by the persistence of the support’s characteristic reflections. Both synthesized catalysts demonstrate adsorption–desorption isotherms type IV and H1-type hysteresis characteristic of mesoporous materials with uniform morphology. Likewise, EDTA at neutral pH increased the NiMoE/ZS07 catalyst’s specific surface area near 615 m²/g, 73% more than that of the catalyst without a chelating agent. FTIR analysis suggests the adsorption of nickel nitrate and ammonium molybdate salts and the thermal decomposition of EDTA. UV–Vis DRS and Raman spectroscopy analyses described that the addition of EDTA at neutral pH together with the calcination conditions significantly reduced the support-deposited species interaction and increased the interaction between metals. The use of the material as a hydrodesulfurization catalyst was enhanced by the modification of the oxidation state of the deposited oxidic molybdenum, as reported by XPS spectra analysis.</p><h3>Graphical Abstract</h3><p>Schematic representation of the effect of EDTA at pH = 7 that promotes a significant contribution to the dispersion of Mo species in the oxide phase on the ZS07 support</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":592,"journal":{"name":"International Journal of Mechanical and Materials Engineering","volume":"20 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://jmsg.springeropen.com/counter/pdf/10.1186/s40712-025-00244-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143583436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of titanium on the catalytic activity of Zn–BDC and Cu–BDC thin films in the photoreduction of CO₂","authors":"Espinoza–Tapia Julio César,&nbsp;Hernández–Pérez Isaías,&nbsp;Becerril–Landero Luis Alberto,&nbsp;González–Reyes Leonardo,&nbsp;Huerta–Arcos Lázaro,&nbsp;Barrera–Calva Enrique,&nbsp;Falcony–Guajardo Ciro","doi":"10.1186/s40712-025-00237-4","DOIUrl":"10.1186/s40712-025-00237-4","url":null,"abstract":"<div><p>The present text deals with the study of thin films of metal–organic frameworks (MOF) materials based on Zn–BDC, Cu–BDC, and their modified versions with titanium incorporations at 5 and 10% mol. These materials were synthesized by chemically assisted vapor deposition (AACVD) technique and characterized by various techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, band gap determination, and photoluminescence spectroscopy.</p><p>The results indicated that the incorporation of titanium modifies the structural, optical, and electronic properties of these MOFs, decreasing their band gap and altering their light absorption and emission characteristics. Furthermore, their efficiency as photocatalysts in the photoreduction of CO₂ in an aqueous system was evaluated, using liquid chromatography (HPLC) to analyze the products.</p><p>It was found that Cu–BDC exhibited higher efficiency compared to Zn–BDC, and the incorporation of titanium significantly improved the catalytic activity of both materials. The 10% Ti–Cu–BDC showed the highest efficiency, with a total yield of 344 mmol/L of products and a conversion efficiency of 56.4%. These results suggest that modification of MOFs with titanium is an effective strategy to optimize their performance in CO₂ photoreduction and other environmental and energy applications.</p></div>","PeriodicalId":592,"journal":{"name":"International Journal of Mechanical and Materials Engineering","volume":"20 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://jmsg.springeropen.com/counter/pdf/10.1186/s40712-025-00237-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143570996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrothermally synthesized CuO/NiO composites as a promising photocatalyst for sunlight-driven organic pollutant degradation","authors":"Gudiguntla Ravi,&nbsp;Niranjan Patra","doi":"10.1186/s40712-025-00246-3","DOIUrl":"10.1186/s40712-025-00246-3","url":null,"abstract":"<div><p>This study investigates the synthesis, characterization, and photocatalytic performance of Copper Oxide/Nickel Oxide (CuO/NiO) hybrid composites, produced via a hydrothermal method. X-ray diffraction (XRD) confirmed the successful formation of CuO/NiO hybrids, highlighting distinct peaks indicative of both CuO and NiO phases. Scanning electron microscopy (SEM) displayed well-defined, uniformly distributed particles, while energy-dispersive X-ray spectroscopy (EDX) validated the stoichiometric composition of the hybrids. The photocatalytic efficacy of the CuO/NiO composites was evaluated under sunlight, demonstrating significantly enhanced degradation of methylene blue (MB) dye compared to pure CuO. This improvement is attributed to the synergistic interaction between CuO and NiO, which facilitates efficient organic pollutant breakdown. Our findings suggest that CuO/NiO hybrids are promising candidates for advanced water treatment technologies, offering a sustainable and efficient approach to mitigating organic pollutants using sunlight-driven photocatalysis.</p></div>","PeriodicalId":592,"journal":{"name":"International Journal of Mechanical and Materials Engineering","volume":"20 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://jmsg.springeropen.com/counter/pdf/10.1186/s40712-025-00246-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of residual stress on the flexural strength and microstructure of Al2O3-ZrO2 composites fabricated by different methods","authors":"Hai-Yan Li,&nbsp;Lei Zhang,&nbsp;Xiao-gen Liu,&nbsp;Detian Wan,&nbsp;Yiwang Bao","doi":"10.1186/s40712-025-00216-9","DOIUrl":"10.1186/s40712-025-00216-9","url":null,"abstract":"<div><p>Due to the mismatch of coefficients of thermal expansion between ZrO₂ and Al₂O₃, thermal residual stress would be induced to the Al₂O₃-ZrO₂ composites during the cooling process. However, Al₂O₃-ZrO₂ composites fabricated by different methods have various stress distribution and stress states, which result in different mechanical properties. In this work, the prestressed coating reinforcement method and the particle enhancement method have been carried out to fabricate Al₂O₃-reinforced ZrO₂ composites (the corresponding specimens marked as AcZs pre-stressed ceramics and Al₂O_3,P/ZrO₂ composites), respectively. The effects of residual stress on flexural strength and microstructure were investigated. Results show that, in the AcZs pre-stressed ceramics, the residual compressive stress exists in the coating, while the tensile stress exists in the substrate. However, the residual stress in Al₂O_3,P/ZrO₂ composites is hydrostatic stress because of the isostatic presses on Al₂O₃ particle in all directions. Furthermore, owing to the residual compressive stress in the surface layer could prevent crack propagation, the flexural strength of AcZs pre-stressed ceramics is higher than that of Al₂O_3,P/ZrO₂ composites with different content of Al₂O₃ particle additions. Generally, the prestressed coating reinforcement method is an effective and low-cost way to improve the mechanical strength of brittle materials, which is more suitable for the preparation of ZrO₂ based ceramics with high strength in this work.</p></div>","PeriodicalId":592,"journal":{"name":"International Journal of Mechanical and Materials Engineering","volume":"20 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://jmsg.springeropen.com/counter/pdf/10.1186/s40712-025-00216-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural, optical, electrical and photocatalytic properties Ce-doped SnO2 nanoparticles for photoelectrochemical applications","authors":"Hamid Khan,&nbsp;Muhammad Noman Khan,&nbsp;Matiullah Khan,&nbsp;Yaseen Iqbal,&nbsp;Syed Muhammad Ahsan,&nbsp;Hafeez Ullah","doi":"10.1186/s40712-025-00220-z","DOIUrl":"10.1186/s40712-025-00220-z","url":null,"abstract":"<div><p>SnO₂ nanoparticles accompanied by various concentrations of Ce as dopant material were prepared to extend the optical absorption spectrum near the visible spectrum. The Ce-doped SnO₂ NPs at 0.5% (w/w) exhibit significantly higher photocatalytic ability compared to pure SnO₂. This enhancement has potential applications in environmental remediation, energy storage, and optoelectronic devices. The microstructures and optical properties of the prepared samples were characterized by XRD, FTIR, EDS, SEM, and UV–vis DRS. The results showed that the nanoparticles are in the tetragonal rutile SnO₂ phase. Increasing Ce concentration (over 0.5% (w/w)) shifted the absorption edge towards higher wavelengths and the band gap energy drops from 3.620 to 3.031 eV. The FTIR spectrum confirmed the O–Sn–O bond information in the synthesized samples. The SEM images showed the formation of nearly spherical nanoparticles. Ce-doped SnO₂ NPs have smaller primary particles than SnO₂ NPs. Reduction in the band gap due to an increase in defects by Ce doping is found and confirmed by the UV–Vis spectra. The existence of Sn and O elements was confirmed by the observed EDS spectra. A plausible photocatalytic mechanism was proposed for the degradation of Methylene blue under UV light to examine the photocatalytic activity of SnO₂ and Ce-doped SnO₂ NPs photocatalyst. The Ce-doped SnO₂ NPs display improved photocatalytic activity compared to SnO₂. The influence of Ce concentration doping on the electrical properties was observed at room temperature. Impedance decreases with the frequency and Ce concentration while ac conductivity is increases with the frequency and Ce concentration. The dielectric constant and the dielectric loss rise up with the Ce doping and decrease with the frequency. Among the synthesized samples, the Ce-doped SnO₂ depict improved ability of photodegradation and the optimal ability of SnO₂ nanoparticles was achieved at 0.5% Ce doping.</p></div>","PeriodicalId":592,"journal":{"name":"International Journal of Mechanical and Materials Engineering","volume":"20 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://jmsg.springeropen.com/counter/pdf/10.1186/s40712-025-00220-z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143496886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation of high-performance Ag2Se NWs/PEDOT:PSS composite films and influence of PEDOT:PSS content on thermoelectric properties","authors":"Ruoxi Wang,&nbsp;Rongke Sun,&nbsp;Yanmei Ren,&nbsp;Yanqing Ma,&nbsp;Lei Ma","doi":"10.1186/s40712-025-00235-6","DOIUrl":"10.1186/s40712-025-00235-6","url":null,"abstract":"<div><p>There is still limited research on the influence of polymer content in inorganic/organic materials on thermoelectric properties. In this study, we systematically investigated the influence of the content of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) in the Ag₂Se nanowires/PEDOT:PSS (Ag₂Se NWs/PEDOT:PSS) composite films on the thermoelectric properties. When the content of PEDOT:PSS is 1.54 wt%, the composite film achieved the highest power factor (PF) of ~ 2074.0 µW m⁻¹ K⁻² at room temperature. The maximum output power (<i>P</i>_max) of the single-leg thermoelectric device based on the composite film is approximately 49.42 nW, and the maximum power density (PD_max) is 4.28 W m⁻² at a temperature difference of 25 K. Furthermore, the film exhibits superior flexibility with 94.3% of the original performance retention after 2000 bending cycles around a rod with a diameter of 5 mm. This work provides valuable guidance for the design and fabrication of high-performance flexible inorganic/organic composite thermoelectric materials.</p></div>","PeriodicalId":592,"journal":{"name":"International Journal of Mechanical and Materials Engineering","volume":"20 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://jmsg.springeropen.com/counter/pdf/10.1186/s40712-025-00235-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143489425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of exhaust catalytic manifold of internal combustion engine","authors":"Vladimir K. Nikolaev,&nbsp;Arkady A. Skvortsov,&nbsp;Zamir F. Khudayarov,&nbsp;Roman S. Nikolaev","doi":"10.1186/s40712-025-00238-3","DOIUrl":"10.1186/s40712-025-00238-3","url":null,"abstract":"","PeriodicalId":592,"journal":{"name":"International Journal of Mechanical and Materials Engineering","volume":"20 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://jmsg.springeropen.com/counter/pdf/10.1186/s40712-025-00238-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tribology technologies for gears in loss of lubrication conditions: a review","authors":"Lorenz Braumann,&nbsp;Virginia Sáenz de Viteri,&nbsp;Bernd Morhard,&nbsp;Thomas Lohner,&nbsp;Jaime Ochoa,&nbsp;Hanns Amri","doi":"10.1186/s40712-024-00204-5","DOIUrl":"10.1186/s40712-024-00204-5","url":null,"abstract":"<div><p>Transmission systems for the aviation industry are continuously pushed to new and extreme limits. Gears in rotorcraft transmissions or geared turbofans must withstand considerable torques while operating at high rotational speeds and temperatures. Such high-power density makes continuous lubricant supply indispensable for the transmission to operate safely. However, loss of lubrication events can occur during operation, potentially leading to gear failure and, consequently, to catastrophic events. The research community is striving to propose alternative solutions for increasing the lifetime of gears in loss of lubrication conditions. Surface and lubricant technologies, such as tribological coatings or ionic liquid additives, have shown great potential to reduce friction and wear and to increase the lifetime of gears under loss of lubrication. This paper reviews the main progress in surface technologies, such as coatings, surface texturing, and thermochemical treatments, with a focus on gear surface treatments. Furthermore, ways to decrease friction in the gear contact to increase wear and scoring resistance by lubricants and additives are discussed. The main findings highlighted in this review can support the future design of new transmission systems for aircraft and helicopters to reduce the need for the yet required secondary lubrication supply, thereby reducing space, cost, weight, and most importantly, CO₂ emissions.</p></div>","PeriodicalId":592,"journal":{"name":"International Journal of Mechanical and Materials Engineering","volume":"20 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://jmsg.springeropen.com/counter/pdf/10.1186/s40712-024-00204-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}