Results in Materials最新文献

{"title":"Spectral manifestation of the transformation of the crystal structure with substituted Bi by Sm in Bi1-xSmxFeO3 and their magnetic properties","authors":"Evgen Leonenko ,&nbsp;Andrii Yaremkevych ,&nbsp;Maxim Rallev ,&nbsp;Oleh Demianyk ,&nbsp;Igor Fesych ,&nbsp;Lesya Demchenko ,&nbsp;Andrii Bodnaruk ,&nbsp;Olena Fesenko","doi":"10.1016/j.rinma.2025.100768","DOIUrl":"10.1016/j.rinma.2025.100768","url":null,"abstract":"<div><div>Nano-sized BiFeO₃, BiFeO₃ doped with different amounts of Samarium, and SmFeO₃ were prepared by the solution combustion method. The obtained compounds have the general formula Bi_1-xSm_xFeO₃, where 0 ≤ x ≤ 0.2. To investigate and clarify the modifications in the crystal structure of the synthesized samples, X-ray diffraction, transmission electron microscopy, Raman spectroscopy, and Fourier-transform infrared spectroscopy were used. The compounds with gradual substitution of Bi³⁺ by Sm³⁺ are characterized by the sequence of the structural transformations from the rhombohedral phase <em>R</em>3<em>c</em> to the orthorhombic phase <em>Pbnm</em>. The concentration range corresponding to the coexistence of the rhombohedral (<em>R</em>3<em>c</em>) and orthorhombic (<em>Pbnm</em>) phases is observed in the interval 0.1 &lt; x &lt; 0.2. The compound Bi_0.85Sm_0.15FeO₃ has significant remanent magnetization, hysteresis loop and coercivity compared to other samples due to the coexistence of two crystalline phases orthorhombic (<em>Pbnm</em>) and rhombohedral (<em>R</em>3<em>c</em>) in a percentage ratio of 92 % and 8 %, i.e. a transformation of the crystalline phases occurs.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"28 ","pages":"Article 100768"},"PeriodicalIF":0.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221329","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":"Validity of crystallite size determination methods based on XRD peak broadening in pure and metal-doped nickel ferrites","authors":"Mst Ruknahe Jannat ,&nbsp;Bristy Biswas ,&nbsp;Md Lutfor Rahman ,&nbsp;Md Farid Ahmed ,&nbsp;Md Jakir Hossain ,&nbsp;Juliya Khanam ,&nbsp;Nahid Sharmin","doi":"10.1016/j.rinma.2025.100762","DOIUrl":"10.1016/j.rinma.2025.100762","url":null,"abstract":"<div><div>The current work is focused on a crystallographic investigation and comparative analysis of crystallite size estimation of pure and metal-doped (Co, Cu, Zn) nickel ferrite samples (J1–J4). Pure NF and doped-NF (Co-NF, Cu-NF, Zn-NF) were achieved through the sol-gel method at 700 °C and subjected to characterization using X-ray Diffraction. To calculate the crystallite size of pure NF and doped-NF, various methods, including the Classical Scherrer (C-S), Munshi Scherrer (M − S), Williamson-Hall (W-H), Linear Straight-Line Model (LSLM), Size Strain Plot (SSP), Halder Wagner (H-W), and Sahadat Scherrer Model (SSM) were employed. Depending on the method employed, satisfactory results have been obtained from all the listed models, excluding the LSLM. LSLM produced invalid outcomes for all the synthesized samples, particularly for sample J3 (797.08 nm). The C-S method yields the smallest sizes, ranging from 34.74 to 57.38 nm, whereas W-H, H-W, and SSP produced significantly larger sizes, up to 132.05 nm for J4, proving the crucial influence of microstrain on peak broadening. The Shahadat Scherrer method consistently reported intermediate values, suggesting a balance between simplicity and improved accuracy. The most consistent and relatively uniform microstructure crystallite sizes across most models (except LSLM) were exhibited by sample J1, while sample J4 showed the highest discrepancy, highlighting strain-induced effects. Overall, the Halder–Wagner and SSP methods appear to offer more robust and accurate size predictions, making them preferable tools for characterizing crystallite dimensions in strain-sensitive systems. All the crystallographic information obtained here is a potential source for estimating crystallite sizes of pure and metal-doped nickel ferrites for various technological applications.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"28 ","pages":"Article 100762"},"PeriodicalIF":0.0,"publicationDate":"2025-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221332","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":"Innovative Bi-functional carbon materials synthesis and characterization from hulls and zest of sclerocarya birrea (A. Rich) for possible biomedical applications","authors":"Moïse Godwé ,&nbsp;Blaise Niraka ,&nbsp;Haman Zara ,&nbsp;Nicolas Koï ,&nbsp;Gomdjé Valery Hambaté","doi":"10.1016/j.rinma.2025.100764","DOIUrl":"10.1016/j.rinma.2025.100764","url":null,"abstract":"<div><div>This work aims the synthesis of sclerocarya pseudo-carbon quantum dots (CDP) and sclerocarya micro-carbon quantum dots (CDC) from the fruits of <em>sclerocarya birrea</em> (SB). It represents a good recovery route. The methodology carried out consists of a method of synthesis by solvothermal carbonization under domestic microwave irradiation of peel and shell powders, activated in an acid medium and functionalized by a solution of <em>sorghum bicolor</em> stem ash concentrate (CSB). The various characterizations, such as XRD diffractograms, show semi-crystalline structures with a crystallinity rate of 70.43 % and mean sizes of 149.25 nm (CDP) and 5.51 μm for CDC (40.67 %). The EDX spectra reveal that the solids are made up of the elements C, O, P, Ca and Si, but the latter element is absent in CDC; the Boehm, pH_PCN and pH_eq methods showed the basic nature of the materials, as demonstrated by the FTIR spectra, which show C-O-C, C=O, C=C, C-H, O-H, P-O and Ca-O functions, with the exception of CDP, which has Si-O. The quantum yields were 15.8 % (CDP) and 9 % (CDC) and good thermal stability of CDC and CDP. The XTT test results highlighted the absence of cytotoxicity of the synthesized innovative materials as well as their biocompatibility. These results provide ample evidence that they are promising for biomedical use as cell markers, diagnostics or theragnostic.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"28 ","pages":"Article 100764"},"PeriodicalIF":0.0,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221330","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":"Remarkable improvement in the mechanical properties of TiAlCrNbVNi medium-entropy alloy through minor boron doping and thermomechanical treatment","authors":"Jason Shian-Ching Jang ,&nbsp;Yi-Cheng Huang ,&nbsp;Po-Sung Chen ,&nbsp;I-Yu Tsao","doi":"10.1016/j.rinma.2025.100761","DOIUrl":"10.1016/j.rinma.2025.100761","url":null,"abstract":"<div><div>This study investigated the effect of minor boron doping on the grain refinement and mechanical properties of the homogenized alloys. The alloy with the optimal yield strength–ductility combination was then processed using thermomechanical treatment to enhance its mechanical properties. X-ray diffraction revealed that as the amount of B doping was increased, the diffraction peaks tended to shift to the right due to B having a much smaller atomic radius than the other elements. The hardness increased from 335 Hv for the base alloy to 365 Hv for the alloy with 0.3 at% B content. B doping improved the post-homogenization yield strength from 963 MPa for the base alloy to 1022 and 1122 MPa for the alloys with 0.05 and 0.3 at% B content, respectively; by contrast, the ductility decreased drastically from 26.8 % to 11.9 %, respectively, due to the formation of plate-like TiB precipitates along the grain boundaries because of the excessive B. Of all the homogenized samples, the (Ti₆₅(AlCrNbV)₃₄Ni₁)_99.95B_0.05 alloy was found to achieve the optimal combination of 1022 MPa tensile yield strength and 26.8 % elongation, values approximately 7 % higher than and similar to those of the base alloy, respectively. The (Ti₆₅(AlCrNbV)₃₄Ni₁)_99.95B_0.05 alloy then underwent cold rolling to reduce its thickness by 70 %, and then rapid annealing up to 900 °C (15 °C/s heating rate). The optimal mechanical properties of (Ti₆₅(AlCrNbV)₃₄Ni₁)_99.95B_0.05, which achieved recrystallization annealing to 817 °C, were a yield strength of 1299 MPa, an ultimate tensile strength of 1491 MPa, and a ductility of 15.4 %.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"28 ","pages":"Article 100761"},"PeriodicalIF":0.0,"publicationDate":"2025-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145060996","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":"Schiff-base modified melamine foams: Tuning hydrophobicity and oleophilicity via benzaldehyde derivatives for selective oil adsorption","authors":"Yuel W. Abraha,&nbsp;Christo van Staden,&nbsp;Alice Brink,&nbsp;Marietjie Schutte-Smith,&nbsp;Hendrik G. Visser,&nbsp;Elizabeth Erasmus","doi":"10.1016/j.rinma.2025.100760","DOIUrl":"10.1016/j.rinma.2025.100760","url":null,"abstract":"<div><div>Melamine foam (MF) was chemically modified with various benzaldehyde (BA) derivatives via Schiff-base formation to enhance its hydrophobicity and oleophilicity for oil spill remediation. BA derivatives with nitro, chloro, methyl, or carboxy groups were grafted onto MF through acid-catalyzed condensation with surface amines, forming imine-linked (C=N) structures. SEM showed the foam's porous 3D network remained intact, while FTIR confirmed Schiff-base formation. Water contact angle measurements indicated significantly increased hydrophobicity in all modified foams except the carboxy-substituted variant (CBA-MF), which remained more hydrophilic due to hydrogen bonding. Hydrophobicity trends correlated inversely with substituent electronegativity. Modified MFs showed strong oil selectivity, efficiently absorbing nonpolar oils while repelling water—especially nitrobenzaldehyde-modified MF (NBA-MF), which floated and absorbed oil effectively. Adsorption tests showed high capacities (up to 149 g/g), correlating with surface hydrophobicity. Modified foams were durable, retaining over 90 % adsorption capacity after 10 reuse cycles. Paraffin oil adsorption followed zero-order kinetics, with rates increasing alongside hydrophobicity. Overall, Schiff-base modification successfully transformed MF into a reusable, highly effective sorbent for selective oil recovery in water.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"28 ","pages":"Article 100760"},"PeriodicalIF":0.0,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145050128","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":"The impact of lignin as soil stabilizer on the characteristics of treated base through full-depth recycling of pavement","authors":"Mohammad Hosein Dehnad,&nbsp;Zainab Alleheawi","doi":"10.1016/j.rinma.2025.100754","DOIUrl":"10.1016/j.rinma.2025.100754","url":null,"abstract":"<div><div>This study explores the application of calcium lignosulfonate (CLS), derived from paper mill waste, as a sustainable stabilizing agent in Full Depth Reclamation (FDR) of asphalt pavement. The use of conventional stabilizing agents in FDR poses environmental challenges, while CLS offers a sustainable alternative by reducing the use of bitumen and cement, minimizing greenhouse gas emissions, and energy consumption. The paper evaluates the performance of CLS in FDR, comparing its use alone and in combination with Portland cement. Assuming the same thickness, two mix designs were considered in this study. One mix design consisted of 85 % RAP and 15 % base soil, while the other mix design comprised 60 % RAP and 40 % base soil. Various combinations of cement and lignin were then considered. Each combination included a percentage of the optimal cement (100 %, 75 %, 50 %, 25 %, and 0 %) and a percentage of the optimal lignin (0 %, 25 %, 50 %, 75 %, and 100 %). Through various tests, it was found that CLS, when combined with Portland cement, enhances the performance of stabilization and increases the Unconfined Compressive Strength (UCS) compared to using only Portland cement or CLS. The study concludes that CLS, especially when combined with Portland cement, significantly improves the environmental and mechanical performance of FDR, making it a more sustainable maintenance and repair method. Moreover, the findings indicate that a higher RAP content leads to a rise in the optimal cement percentage while reducing the optimal percentage of CLS. Also, for the 28-day cured samples, 85 % RAP with 50 % cement and 50 % lignin, and 60 % RAP with 75 % cement and 25 % lignin, have UCS values that are 10.6 % and 5.8 % higher, respectively, compared to the samples stabilized only with the optimal percentage of cement without lignin.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"27 ","pages":"Article 100754"},"PeriodicalIF":0.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144919742","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)00102-5","DOIUrl":"10.1016/S2590-048X(25)00102-5","url":null,"abstract":"","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"27 ","pages":"Article 100757"},"PeriodicalIF":0.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145009955","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":"Photocatalytic activity of TiO2 microtubes fabricated via ZnO rods dissolution on stainless-steel meshes","authors":"Shuji Nomura,&nbsp;Keita Yamamoto,&nbsp;Masaru Shimomura,&nbsp;Naoki Shimosako","doi":"10.1016/j.rinma.2025.100755","DOIUrl":"10.1016/j.rinma.2025.100755","url":null,"abstract":"<div><div>In this study, the photocatalytic performance of TiO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> microtubes synthesized on stainless-steel meshes (SSMs) was investigated with the aim of combining a high surface area with substrate permeability. ZnO rods were first produced on SSMs using a water bath method and then dissolved during a liquid-phase deposition process that simultaneously deposited TiO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>, resulting in TiO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> microtubes. Photocatalytic activity tests showed that the microtubes annealed at 500–700 °C achieved the highest activity within the 300–900 °C range, comparable to that of the standard TiO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> photocatalyst (P25), even though the mesh structure allowed only approximately 70% of the incident UV light to reach the sample. When normalized to the actual irradiated area, the TiO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> microtubes were approximately 1.6 times more active than P25. These findings indicate that TiO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> microtubes on SSMs are promising for photocatalytic applications requiring both high reactivity and permeability, such as water purification and air cleaning.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"28 ","pages":"Article 100755"},"PeriodicalIF":0.0,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145011307","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":"Study of statistical and technological size effects in cast brass","authors":"Martin Benedikt Klaushofer,&nbsp;Michael Stoschka,&nbsp;Bernd Maier,&nbsp;Florian Grün","doi":"10.1016/j.rinma.2025.100756","DOIUrl":"10.1016/j.rinma.2025.100756","url":null,"abstract":"<div><div>This study aims to quantify the effect of grain size and specimen volume on the static and fatigue strength of the cast brass alloy CuZn35Mn2Al1Fe1-C-GS. Specimens were extracted from a large cast component, where variations in cooling rates resulted in grain sizes ranging from about 1 mm (fine-grained) to 9 mm (coarse-grained). To evaluate the statistical size effect, tensile and uniaxial fatigue tests under pulsating tension were performed on specimens with different highly stressed volumes. Fine-grained specimens showed up to a 34% increase in fatigue strength and a 19% increase in tensile strength compared to coarse-grained ones. Similarly, smaller specimens outperformed larger ones, with fatigue strength improvements of about one-third, dependent on the microstructure. The Hall-Petch relation was used to quantify the influence of grain size, and further incorporated into a volumetric statistical size effect model. The Weibull exponent is expressed as a function of grain size and highly stressed volume, thus extending design recommendations such as the FKM-guideline towards size effects in cast brass alloys.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"27 ","pages":"Article 100756"},"PeriodicalIF":0.0,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144911898","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":"Nanofluids for advanced thermal management: A multi-criteria review of performance, cost, and environmental impacts","authors":"Hamid-Reza Bahrami ,&nbsp;Omid Allahdadi ,&nbsp;Hamid Saffari","doi":"10.1016/j.rinma.2025.100753","DOIUrl":"10.1016/j.rinma.2025.100753","url":null,"abstract":"<div><div>Nanofluids—engineered suspensions of nanoparticles in conventional fluids—have emerged as next-generation coolants due to their exceptional thermal properties. This review synthesizes recent progress in nanofluid research with a multi-criteria evaluation of thermophysical performance, cost-efficiency, and environmental impacts. Carbon-based nanofluids, particularly graphene and multi-walled carbon nanotubes (MWCNTs), dominate current research (36 %) owing to their ultrahigh thermal conductivities (∼4000–6000 W/m·K) and favorable dispersion stability. In contrast, metal-based (28 %) and metal oxide-based (24 %) nanofluids offer a trade-off between performance and affordability, with Al₂O₃ (44 %) emerging as the most studied oxide. Hybrid nanofluids, although representing only 12 % of studies, demonstrate synergistic thermal enhancements—boosting thermal conductivity up to 42.7 % and reducing peak battery temperatures by as much as 26.4 % in advanced battery thermal management systems. Despite their performance gains, nanofluids face economic and operational challenges. Costs range widely—from $180 for 4L of 2 % Al₂O₃ nanofluid to $85,000 for gold-based formulations. Viscosity models show that even small increases in nanoparticle concentration significantly elevate flow resistance, demanding greater pumping power. Environmental concerns remain significant, as certain nanoparticles commonly used in thermal applications—such as Al₂O₃ and Ni—have extremely low reference dose thresholds (e.g., &lt;0.01 mg/kg/day), indicating that even minimal exposure could pose toxicological risks to human health and the environment. A nanoparticle scoring framework integrating thermal performance, cost, and environmental impact identifies graphene and low-grade MWCNTs as optimal additives. This review concludes that while nanofluids hold transformative potential for energy, electronics, and transportation sectors, further efforts are required to enhance their economic viability, environmental safety, and long-term stability for widespread industrial adoption.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"27 ","pages":"Article 100753"},"PeriodicalIF":0.0,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144890439","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}