Results in Materials最新文献

{"title":"Ultra-broadband microwave absorption in cobalt particle composites through nanoflake morphology and filler-gradient multilayer design","authors":"Y. Zare,&nbsp;M. Jazirehpour","doi":"10.1016/j.rinma.2025.100742","DOIUrl":"10.1016/j.rinma.2025.100742","url":null,"abstract":"<div><div>This research investigates the optimization of microwave absorption in cobalt particles containing composites through controlled particle morphology and multilayer absorber design. Flake-shaped Co particles were synthesized via a hydrothermal method using cobalt chloride, CTAB, NaOH, and hydrazine. X-ray diffraction (XRD) analysis confirmed the presence of Co phases, while field-emission scanning electron microscopy (FESEM) revealed a flaky morphology with an average thickness of 80 nm and diameter of 10 μm. The electromagnetic properties of composites containing paraffin wax and varying weight percentages (50 %, 60 %, and 70 %) of Co nanoflakes were measured from 1 to 18 GHz. Furthermore, a filler-gradient multilayer design, employing paraffin as an impedance-matching layer followed by layers of composites with varying Co concentrations, significantly improved absorption performance. This optimized multilayer structure achieved an exceptionally wide absorption bandwidth of 14.8 GHz (3.2–18 GHz) with a minimum absorption of −10 dB and a maximum absorption exceeding −150 dB at 4.1 GHz, demonstrating the synergistic effect of particle morphology control and multilayer design in achieving superior microwave absorption characteristics. These findings offer valuable insights for the design and fabrication of high-performance microwave absorbers for various applications.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"27 ","pages":"Article 100742"},"PeriodicalIF":0.0,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144517829","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}

{"title":"Eco-friendly particle boards from Triumfetta cordifolia stems: Adhesion with Aningeria altissima tannin and stabilization using natural rubber latex","authors":"Armel Edwige Mewoli ,&nbsp;Azemafac Desmond Nkapleweh ,&nbsp;Abel Emmanuel Njom ,&nbsp;Jean Jalin Eyinga Biwôlé ,&nbsp;Anatole Chengoue Mboyap ,&nbsp;Augustine Demze Nitidem ,&nbsp;Catherine Chrysalde Litet ,&nbsp;Ernest Martial Angoa ,&nbsp;Herman Lekane Assonfack ,&nbsp;Michel Mbere Taoga ,&nbsp;Fabien Betene Ebanda ,&nbsp;Lucien Raymond Meva’a ,&nbsp;Atangana Ateba","doi":"10.1016/j.rinma.2025.100741","DOIUrl":"10.1016/j.rinma.2025.100741","url":null,"abstract":"<div><div>This article presents the manufacturing of eco-friendly particle boards from <em>Triumfetta cordifolia</em> stems, bonded with a tannin-based resin from <em>Aningeria altissima</em> and stabilized with natural rubber latex. This combination aims to reduce the use of synthetic resins that emit formaldehyde, while improving the water resistance and mechanical properties of the boards. Four formulations were studied, with latex concentrations varying from 0 % to 15 %. The panels containing 15 % latex showed reduced swelling (17.3 %) after 24 h of immersion, compared to panels without latex (80.1 %), and a density that complies with medium-density board standards. The best flexural strength (20.6 MPa) was achieved with 5 % latex, while the addition of latex up to 15 % increased internal bonding, reaching 0.55 MPa, well above the standards for boards used in dry conditions. These results demonstrate the potential of tannin and latex-based bio-adhesives as an ecological alternative to synthetic resins, meeting industrial requirements and contributing to a circular economy in the composite materials sector. The results show that the tannin-based resin improves the mechanical strength and water resistance of the panels, with optimal performance observed at 5 % latex content. The internal bond strength increased significantly with tannin, reaching 0.55 MPa, exceeding industry standards for dry-use panels.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"27 ","pages":"Article 100741"},"PeriodicalIF":0.0,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144280696","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}

{"title":"Strengthening of Ni-based superalloys using energy-intensive multifunction cavitation processing systems incorporating ionic liquids","authors":"Toshihiko Yoshimura ,&nbsp;Suguru Ito ,&nbsp;Yuto Maeda ,&nbsp;Masataka Ijiri","doi":"10.1016/j.rinma.2025.100740","DOIUrl":"10.1016/j.rinma.2025.100740","url":null,"abstract":"<div><div>This work developed an energy-intensive multifunction cavitation technology involving ionic liquids (ILs). This technology was used to process a single crystal of the Ni-based superalloy SC610, employing a mixture of the IL 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF₄]) and pure water. The intensity of this process was found to result in the formation of surface cracks and new chemical compounds that were deposited on the alloy surface. The application of this treatment to a columnar crystal of the Ni-based superalloy CM186LC provided a more uniform surface structure than that obtained from the same process without the IL. Incorporating the IL also reduced the processing time and increased the hardness that could be obtained. The ions comprising the IL were found to be incorporated into the cavitation bubbles. Multiphoton ionization was promoted by laser irradiation and collisions between bubbles were made more forceful by the Lorentz force associated with a magnetic field. These factors increased the number of bubbles available for processing.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"27 ","pages":"Article 100740"},"PeriodicalIF":0.0,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144330859","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}

{"title":"Enhancing microstructure and mechanical properties of FeNi1.5CrCu0.5 high-entropy alloy through precipitation treatment and cold rolling","authors":"Farideh Salimyanfard ,&nbsp;Mohammad Reza Toroghinejad ,&nbsp;Mehdi Alizadeh ,&nbsp;Parisa Moazzen ,&nbsp;Mohsen Mohammadi","doi":"10.1016/j.rinma.2025.100736","DOIUrl":"10.1016/j.rinma.2025.100736","url":null,"abstract":"<div><div>This study investigates how precipitation treatment affects the microstructure and mechanical properties of FeNi_1.5CrCu_0.5 high-entropy alloy, focusing on the role of precipitates during deformation. Homogenization followed by precipitation treatment formed Cr-rich precipitates, enhancing mechanical properties. After 80 % cold rolling, the homogenized sample (HR) developed uniform fine shear bands, while the homogenized and precipitated sample (HGR) showed a heterogeneous distribution of fine and coarse shear bands. In the HGR sample, rotational dynamic recrystallization within shear bands produced new strain-free grains during deformation. Mechanical testing indicated that precipitation treatment increased ultimate shear strength from 459 MPa to 488 MPa, the shear yield strength from 340 MPa to 347 MPa, and the Vickers hardness from 134 HV to 171 HV, due to Cr₂₃C₆ precipitates impeding dislocation motion. Following 80 % cold rolling, the HGR sample exhibited slightly lower strength (ultimate shear strength: 526 MPa; shear yield strength: 353 MPa) compared to the HR sample. However, a significantly improvement in ductility was observed, with shear elongation increasing from 10 % to 22 %, driven by strain-free grain formation. These results emphasize the critical role of precipitation treatments and cold deformation in optimizing the microstructure and mechanical properties of high entropy alloys for advanced engineering applications.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"27 ","pages":"Article 100736"},"PeriodicalIF":0.0,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144242513","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}

{"title":"Water adsorption properties of silica gel and hydroxyethyl cellulose composite coatings","authors":"Lucas Lovis,&nbsp;Andrew Maddocks,&nbsp;Priscilla Tremain,&nbsp;Behdad Moghtaderi","doi":"10.1016/j.rinma.2025.100734","DOIUrl":"10.1016/j.rinma.2025.100734","url":null,"abstract":"<div><div>Water scarcity is an increasingly significant global issue. Desiccant coated heat exchangers are a potential adsorption reactor for atmospheric water generation, which can alleviate water scarcity through the subsequent adsorption, desorption, and condensation of ambient humidity. Microporous and mesoporous silica gels are common and inexpensive desiccants that demonstrate moderate adsorption and desorption rates, and hence are suitable for multicyclic atmospheric water generation. To accurately model the behaviour of silica gel based desiccant coated heat exchanger-atmospheric water generation systems, the kinetic and equilibrium properties of silica gel were measured for varying coating thicknesses, hydroxyethyl cellulose binder concentrations, temperatures, and relative humidity conditions using thermogravimetric analysis. Additionally, the particle size, pore textural properties, and density of the samples were measured using scanning electron microscopy, nitrogen adsorption, and pycnometry respectively. The average particle size within the coatings increased with increasing hydroxyethyl cellulose concentration. The equilibrium uptake was lower for the coating samples compared to the powder sample and was not strongly dependant on the adsorption temperature. The kinetic constants and maximum ideal specific water production were inversely related to the coating thickness and were not strongly dependant on the hydroxyethyl cellulose concentration. The adsorption order and kinetic constant varied depending on whether monolayer adsorption, multilayer adsorption, pore filling, or capillary condensation were occurring. The effect of the change in adsorption mechanism on the kinetic constant was less significant for thicker layers and lower adsorption temperatures. The maximum ideal specific water production for the coating samples within the set of measured conditions was 57 L kg⁻¹ day⁻¹.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"27 ","pages":"Article 100734"},"PeriodicalIF":0.0,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144242514","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}

{"title":"Modulated phase and morphology of bismuth oxyiodide supported on natural halloysite by alcoholic solvents","authors":"Indra Cipta ,&nbsp;Indriana Kartini ,&nbsp;Akhmad Syoufian ,&nbsp;Chotimah ,&nbsp;Kumala Dewi","doi":"10.1016/j.rinma.2025.100728","DOIUrl":"10.1016/j.rinma.2025.100728","url":null,"abstract":"<div><div>The study investigated the impact of three alcoholic solvents—ethanol (Et), ethylene glycol (EG), and glycerol (GLY)—on the solvothermal synthesis of the supported photocatalyst BiOI/natural halloysite. Characterization using FTIR, X-ray diffraction, SEM, TEM, DR-UV-Vis, and fluorescence spectroscopy provided insights into the structure, phase, morphology, and optical properties. Natural halloysite (HAL) was sourced from Gamalama volcanic soil. Consequently, varied BiOI and Bi₅O₇I phases, sizes, and morphologies were observed with different solvents. Ethylene glycol and ethanol produced spherical BiOI particles (1–5 μm in diameter), while glycerol yielded tube-shaped Bi₅O₇I particles (1 μm). The incorporation of halloysite hindered BiOI agglomeration, leading to an increase in the bandgap energy. The bandgap energy for BiOI (Et) was 1.98 eV, whereas for BiOI/HAL (Gly), it was 2.79 eV. Natural halloysite effectively reduced electron-hole recombination, as confirmed by fluorescence spectroscopy. This study elucidates how the selection of solvent and the addition of halloysite modulate the properties of the resulting photocatalyst. This study is the first to report the use of natural halloysite from Gamalama as a supporting material for Bismuth Oxyiodide (BiOI). Our findings reveal that natural halloysite can prevent BiOI agglomeration, increase bandgap energy, and reduce electron-hole recombination.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"27 ","pages":"Article 100728"},"PeriodicalIF":0.0,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144229830","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}

{"title":"Synthesis and characterization of polyvinyl alcohol-based bioplastic film incorporated with keratin extracted from duck feathers","authors":"Md. Lawshan Habib ,&nbsp;Md. Hanif Munshi ,&nbsp;Md. Kamruzzaman ,&nbsp;Tama Baul ,&nbsp;M. Mehedi Hasan","doi":"10.1016/j.rinma.2025.100735","DOIUrl":"10.1016/j.rinma.2025.100735","url":null,"abstract":"<div><div>The growing environmental impact of petroleum-based plastics has led to increased interest in biodegradable alternatives. However, many bioplastics still face limitations in terms of cost, mechanical properties, and degradability. To address these challenges, this study aims to develop an eco-friendly bioplastic film. Our methodology involves utilizing discarded feather keratin sourced from duck feathers, which is then incorporated into polyvinyl alcohol (PVA). The PVA matrix, along with the keratin filler, provides the bioplastic film with the necessary attributes for biodegradability as well as imparting mechanical and thermal properties that make it suitable for a wide range of sustainable applications. The keratin was successfully extracted from waste duck feathers, resulting in a commendable yield of 79 %. The bioplastic film was prepared using different concentrations of the constituents and subsequently analyzed using various characterization techniques. The thermal and mechanical properties of the bioplastic exhibited a notable enhancement when compared to pure PVA. The prepared film's optimal composition was determined to be P5K0.05 (PVA 5 wt% and Keratin 0.05 wt%). The other characterization techniques, such as FTIR, SEM, and TGA, also exhibit a commendable agreement with the obtained results. The results of the cytotoxicity assessment indicated that the prepared bioplastic exhibits biocompatibility.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"27 ","pages":"Article 100735"},"PeriodicalIF":0.0,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144229944","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}

{"title":"Aims and Scope","authors":"","doi":"10.1016/S2590-048X(25)00082-2","DOIUrl":"10.1016/S2590-048X(25)00082-2","url":null,"abstract":"","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"26 ","pages":"Article 100737"},"PeriodicalIF":0.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144223562","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}

{"title":"Multi scale modelling of the hygro-mechanical behavior of Rhecktophyllum camerunense vegatable fibers","authors":"Noutegomo Boris ,&nbsp;Betene Ebanda Fabien ,&nbsp;Atangana Ateba","doi":"10.1016/j.rinma.2025.100733","DOIUrl":"10.1016/j.rinma.2025.100733","url":null,"abstract":"<div><div>The study of <strong><em>Rhecktophyllum Camerunense</em></strong> (RC) fibers as reinforcement of polymer matrix began in 2008 and has already demonstrated their ability to replace the glass fibers. In this paper, the influence of humidity on the mechanical behavior of plant fiber is studied and a multiscale model is proposed. The moisture absorption of RC fibers is studied through a multi concentric cylinder model developed based on the work of Marklund. Using mechanical properties of the three main components of natural fibers; cellulose, hemicelluloses and lignines, the mechanical properties and hygroscopic coefficients of layers S1, S2 and S3 of RC fiber are calculated following the relative humidities of 23 %, 54 % and 75 %. The results lead to the conclusion that there is an influence of relative humidity on the mechanical properties whether at the microscopic level of constituents or the mesoscopic scale of layers and the macroscopic scale of RC fiber structure. That influence is negative because it drops the mechanical properties of the fiber. This work permitted to validate the experimental study done on the RC fiber for the same relative humidities.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"27 ","pages":"Article 100733"},"PeriodicalIF":0.0,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144229831","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}

{"title":"Effect of curing procedure on mechanical properties and pore structure characteristics of three different concrete types","authors":"Dina A. Emarah,&nbsp;Mostafa A. Mostafa,&nbsp;M. Anwar","doi":"10.1016/j.rinma.2025.100732","DOIUrl":"10.1016/j.rinma.2025.100732","url":null,"abstract":"<div><div>This study investigates the influence of curing methods on the mechanical properties and pore structure characteristics of concretes including Sulphate-Resisting Cement (SRC), Ordinary Portland Cement (OPC), and Blast-Furnace Slag Cement (BFSC). Two curing regimes were applied: water immersion (Method I) and controlled humidity (Method II) at 22 °C and 80 % RH, with twice-daily water sprinkled for 7 days. Concrete mixtures with a 0.4 water-to-cement ratio and 400 kg/m³ cement content were assessed in terms of fresh properties, including slump, air content, and unit weight. The hardened properties were evaluated through compressive, flexural, and tensile strength tests, in addition to pulse velocity and dynamic elastic modulus measurements. To examine the impact of curing conditions on porosity, Mercury Intrusion Porosimetry (MIP) was used to quantify cumulative intrusion volume, porosity, pore surface area, and average pore diameter. Unlike previous studies that primarily focus on compressive strength, this research uniquely investigates mechanical performance with pore structure variations induced by curing conditions, filling a critical gap in the existing literature. The findings confirm that Method I significantly improves mechanical properties, particularly for SRC, which achieved the highest compressive strength of 741 kg/cm² at 180 days. OPC exhibited the highest flexural strength (86.0 kg/cm² at 28 days), whereas SRC outperformed in tensile strength under Method I. MIP analysis revealed that water immersion curing reduced the average pore diameter of SRC to 0.0266 μm, resulting in denser concrete, making it ideal for aggressive Sulphate-rich and chloride-laden environments. The study further validates nondestructive testing methods, as pulse velocity and dynamic elastic modulus correlated well with compressive strength results, reinforcing their reliability in assessing concrete quality without destructive testing. Additionally, this research provides a practical comparison between standard curing and field-applicable curing methods, addressing real-world construction constraints where continuous water immersion is often impractical. These findings contribute to global research by offering practical insights into curing efficiency, particularly for Sulphate-resistant and blended cementitious systems. Future research should explore extended durability assessments beyond 180 days, alternative curing techniques, and machine learning-based predictive modeling to enhance curing optimization for high-performance concrete in harsh environmental conditions.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"27 ","pages":"Article 100732"},"PeriodicalIF":0.0,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144229940","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}