Results in Materials最新文献

{"title":"Sustainable synthesis and characterization of silver nanoparticles through Juncus acutus flowers and evaluation of their ability to detect NO2 and NH3 gases","authors":"Mohammed B. AbdulWahid ,&nbsp;Osama H. Abdullah ,&nbsp;Othman Hamad Farhan ,&nbsp;Maytham Imad Ahmed ,&nbsp;Ahmed Mishaal Mohammed ,&nbsp;Yousif Hendi Khalaf","doi":"10.1016/j.rinma.2025.100723","DOIUrl":"10.1016/j.rinma.2025.100723","url":null,"abstract":"<div><div>In this effort, the Juncus acutus plant's flowers were used to create silver nanoparticles (AgNPs). Using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and energy dispersive X-ray (EDX), the characteristics of the prepared silver nanoparticles were evaluated. The size of the silver nanoparticles was 38.40 nm. At various temperatures and times, the silver nanoparticles were assessed as gas sensors for the gases NO₂ and NH₃. At 100 °C, the highest sensitivity response to NO₂ gas was 15.09 %. However, in the case of the NH₃ gas, the highest sensitivity response was 25 % at 200 °C. For NO₂, the sensor displayed the smallest response and recovery times at various temperatures: 19.71s at 300 °C and 33.3s at 100 °C, respectively, and for NH₃ gas, 16.74s at 200 °C and 20.25s at 300 °C, respectively. These outcomes highlight the sensor's exceptional response and recovery abilities.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"26 ","pages":"Article 100723"},"PeriodicalIF":0.0,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143932027","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":"Theoretical analysis of an annular fin with power law temperature-dependent emissivity: A minimization approach","authors":"R.A. Oderinu,&nbsp;A.D. Ohaegbue,&nbsp;S. Alao,&nbsp;A.A. Oyewumi,&nbsp;A.A. Yahaya","doi":"10.1016/j.rinma.2025.100714","DOIUrl":"10.1016/j.rinma.2025.100714","url":null,"abstract":"<div><div>This study focused on examining the distribution of temperature and thermal stress in annular fins. This was done by developing an energy balance equation that incorporated temperature-dependent emissivity, using a power law to account for both linear and non-linear relationships. The energy equation was scaled using appropriate dimensional variables, and the resulting dimensionless equation was solved using a partition minimization technique, yielding results in the form of a polynomial. In order to assess the efficacy of the solution approach, the acquired results were compared with those documented in the literature and were found to be highly consistent. The influence of different thermo-physical properties on temperature distribution and thermal stress were investigated. It was observed that these properties have a direct impact on both temperatures of the fin and stress associated. The study demonstrated that an increase in the order of nonlinearity in emissivity results in more heat dissipation from the system as well as causing more radial stress to the fin, thereby accurately reflecting the practical phenomenon of emissivity that a constant form may not capture. Therefore, engineers are advised to consider these parameters, such as emissivity, which varies with temperature, when designing.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"26 ","pages":"Article 100714"},"PeriodicalIF":0.0,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143912970","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":"Defluoridation through the utilization of unmodified precipitate derived from a mucilaginous agricultural plant material","authors":"Mukhethwa P. Mannzhi,&nbsp;Joshua N. Edokpayi","doi":"10.1016/j.rinma.2025.100719","DOIUrl":"10.1016/j.rinma.2025.100719","url":null,"abstract":"<div><div>Fluoride is naturally abundant at varying levels globally, although its present in trace levels (&lt;1.5 mg/L) is often associated with health benefits but elevated levels is known to cause dental and skeletal fluorosis. In this study, precipitate derived from the mucilaginous plant materials were characterised and tested for its potential to reduce excess fluoride from both aqueous solution and real groundwater samples. The precipitate was characterised using standard protocols. The effects of several operating parameters on the sequestration of fluoride from aqueous solution was reported. The precipitate was found to have N-H and O-H (Functional groups), porous and flaky (morphology), macroporous (surface area) and calcium oxide as the highest chemical composition which could be responsible for deflouridation. From the sorption batch experiment a maximum fluoride sorption capacity of 84.07 % from 10 mg/L concentration solution at 303.15 K was recorded. The maximum adsorption capacity recorded was 24.15 mg/g. The Langmuir equilibrium model best described the sorption reaction while the pseudo-second-order kinetic model best described the kinetics of the sorption process. The process was spontaneous, feasible and exothermic in nature.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"26 ","pages":"Article 100719"},"PeriodicalIF":0.0,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143912971","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":"Chemical and biological assessment of biosynthesized Magnetite (Fe3O4) nanoparticles (NPs) mediated quercetin extracted from Allium cepa","authors":"Hussein Hadi Mossa Mishbak ,&nbsp;Muna S. Merza ,&nbsp;Estabraq Tareq Shanshool ,&nbsp;Ehsan kianfar","doi":"10.1016/j.rinma.2025.100712","DOIUrl":"10.1016/j.rinma.2025.100712","url":null,"abstract":"<div><div>Bioactive phytochemicals derived from plant extracts have drawn considerable interest due to their potential for the creation of novel medications and for the ‘environmentally friendly’ synthesis of ‘nanoparticles.’ In the present study, a variety of techniques, including LC-Mass, NMR, and CHNOS elements, were used to identify quercetin, which was extracted from chopped onion and later utilized as a reducing agent for the “biosynthesis of Fe3O4 nanoparticles”. The obtained Fe₃O₄ was characterized by zeta potential (Z-P), field emission scanning electron microscopy, EDs, TEM, and zeta potentials. Air-dried chopped onion (2 kg) was extracted and purified, yielding 24.0 %. The structure of the isolated quercetin was determined using column chromatography, spectroscopic techniques, and elemental analysis. In this study, Fe₃O₄ nanoparticles were prepared using quercetin extract. The antiviral and antibacterial activities of Quercetin, and Fe₃O₄ NPs were determined using the well diffusion method against pathogenic microbes, <em>Staphylococcus aureus</em> and <em>Escherichia coli.</em> It was observed that the greatest effect against influenza virus and bacterial strains was Quercetin combined with Fe₃O₄ nanoparticles compared with Quercetin and Fe³O₄ NPs alone. Our findings suggest that Fe₃O₄ NPs, and Quercetin may be used in the future as a synergistic model for more biomedical applications.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"26 ","pages":"Article 100712"},"PeriodicalIF":0.0,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143902307","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":"Mechanical properties and suitability of PLA for 3D-printed dental implants: Experimental and simulation analysis","authors":"Ahmed M. Abdelrhman ,&nbsp;Maryam Sabea ,&nbsp;Iftikhar Ahmad ,&nbsp;Nesrine Gaaliche ,&nbsp;Yasir Hassan Ali","doi":"10.1016/j.rinma.2025.100713","DOIUrl":"10.1016/j.rinma.2025.100713","url":null,"abstract":"<div><div>This study investigates the mechanical properties of Polylactic Acid (PLA) in 3D-printed medical implants, focusing on dental applications. PLA, significantly lighter than traditional titanium implants, reduces stress on the jawbone and surrounding tissues, improving patient comfort. The research evaluates PLA's mechanical and structural properties through computational simulations, experimental studies, and data analysis. Mechanical testing, including tensile and compressive strength assessments, was conducted to determine PLA's suitability for dental applications. Finite Element Analysis (FEA) was used to simulate mechanical behavior under various loading conditions. Results indicate that while PLA demonstrates good biocompatibility and ease of fabrication, its mechanical strength is insufficient for permanent dental implants. However, its properties make it a promising material for temporary dental applications. The findings provide valuable insights into the relationship between PLA's properties and implant performance, guiding future research on material modifications to enhance its applicability in medical implants.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"26 ","pages":"Article 100713"},"PeriodicalIF":0.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903513","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 effect of fabrication methods on the physical properties of Sumberejo kenaf fiber - Polyurethane foam core sandwich composite for sustainable building construction","authors":"Ilva Zahrotin ,&nbsp;Ariadne L. Juwono ,&nbsp;Januar P. Siregar ,&nbsp;Seto Roseno ,&nbsp;Saeful Rohman ,&nbsp;Eryanti Kalembang","doi":"10.1016/j.rinma.2025.100718","DOIUrl":"10.1016/j.rinma.2025.100718","url":null,"abstract":"<div><div>Sandwich composites made of natural fibers are currently being investigated for use in buildings. Kenaf fiber is an environmentally friendly material that is widely used in cement and polymer composites owing to its strength and support. The purpose of this study was to investigate the fabrication method and physical properties of a Sumberejo kenaf fiber-polyurethane foam core sandwich composite (KF/EP-PU foam) for sustainable building construction. Sumberejo kenaf/epoxy laminate composites (KF/EP) were used as the skin layer in sandwich composites, with polyurethane foam (PU foam) as the core of the sandwich composites. Sandwich composites were fabricated using two methods: cold press and vacuum-assisted resin infusion (VARI). The water absorption, burning rate, and sound absorption coefficient of the sandwich composite production process were investigated. The results demonstrated that sandwich composites employing the VARI method had a lower percentage of water absorption (3.95 ± 0.38 %) than cold press method (7.21 ± 0.67 %). This indicates a more effective epoxy resin wetting procedure for covering the kenaf and polyurethane foam. The horizontal burning test showed no significant difference between the KF/EP-PU foam VARI (18.5 ± 1.3 mm/min) and KF/EP-PU foam cold press (18.9 ± 0.4 mm/min). The highest peak sound absorption coefficient of the KF/EP-PU foam cold press was 0.168 at 1000 Hz, whereas KF/EP-PU foam VARI sample had a sound absorption coefficient of 0.169 at 1128 Hz. It is recommended to consider the use of suitable fabrication methods for building application. The fiber and matrix weight fractions also need to be explored further.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"26 ","pages":"Article 100718"},"PeriodicalIF":0.0,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143932026","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 effect of first and repetitive inter-pass annealing during severe plastic deformation on microstructure and mechanical properties of low carbon steel","authors":"Mohammad Abdian,&nbsp;Mohsen Kazeminezhad","doi":"10.1016/j.rinma.2025.100721","DOIUrl":"10.1016/j.rinma.2025.100721","url":null,"abstract":"<div><div>In this study, we used the severe plastic deformation (SPD) technique, called constrained groove pressing (CGP), to investigate the effect of first and repetitive inter-pass annealing on the mechanical and microstructural properties of a low carbon steel. The main purpose of this study was to increase the imposed strain while reducing the reported decline in ultimate tensile stress (UTS) in the CGP process of the low carbon steel sheet. To achieve the objectives of this study, two distinct annealing modes—repetitive inter-pass annealing and first-stage inter-pass annealing—were applied between the CGP passes. These annealing treatments were conducted at 300 °C, 400 °C, and 500 °C for 20 min. The differences between these annealing modes were then thoroughly investigated. Using hardness and tensile tests, we found that, by performing both the repetitive and first inter-pass annealing process, the hardness remains approximately constant, 160–170 Vickers, by increasing the CGP number of passes; in addition, the rate of reduction of elongation (%) decreases with an increase in the number of passes. Besides, as the number of CGP passes increases, the UTS reduction following the second CGP pass becomes less significant compared to the non-annealed condition. The UTS of the inter-pass annealed samples after the second CGP pass ranges between 350 and 400 MPa, which is 10–20 % higher than that of the non-annealed condition <strong>(</strong>326 MPa<strong>)</strong>. Notably, in the study of first inter-pass annealing, we could process up to four passes for low carbon steel without tearing the sample, a significant achievement for low carbon steel. Moreover, for the first time, the differences between first and repetitive inter-pass annealing were investigated, revealing that first inter-pass annealing yields a higher UTS, up to 7 %, and greater elongation (%), up to 41 %, compared to repetitive inter-pass annealing. As a matter of fact, inter-pass annealing during the CGP process could lead to an improvement in the microstructure and mechanical properties of low carbon steel.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"26 ","pages":"Article 100721"},"PeriodicalIF":0.0,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143912973","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":"Design and development of motorcycle helmet using carbon fiber reinforced epoxy resin hybrid composite","authors":"Nuzhat Aqila Tushe ,&nbsp;Syed Tanjib Mahmud ,&nbsp;Nafiul Islam ,&nbsp;Golam Mostofa ,&nbsp;Noshin Tasnim Tuli ,&nbsp;Adib Bin Rashid","doi":"10.1016/j.rinma.2025.100716","DOIUrl":"10.1016/j.rinma.2025.100716","url":null,"abstract":"<div><div>Motorcycle helmets are crucial for rider safety, and there's a high need for affordable helmets that provide optimal safety to the riders. This research focuses on manufacturing motorcycle helmets by applying carbon fiber, Kevlar, and fiberglass reinforced with epoxy resin. Carbon fiber helmets provide durability, comfort, and affordability. Kevlar is lightweight, offers excellent ballistic protection, reduces fatigue, and is resistant to certain threats, whereas fiberglass is strong and resists bending and compression. This research aims to design a motorcycle helmet following the regulations provided by the Department of Transportation (DOT). Samples with different stacking sequences, sample A (CFCFC), sample B (FCFCF), and sample C (FCKCF), were fabricated with a 3 mm thickness and tested for tensile strength, flexural bending, and impact to ensure the efficacy of the helmet. After analyzing the results, it was observed that in the tensile test, sample B achieved the highest tensile strength (124.7 MPa), followed by sample A (89.78 MPa) and sample C (59.01 MPa). In the flexural test, sample A demonstrated a remarkable flexural strength of 0.767 MPa and a flexural modulus of 6.60 MPa, which is much higher than sample B and C. The results indicate that the arrangement of the reinforcement fibers in composite materials plays a vital role in determining the flexural strength and modulus exhibited by the composites. In the impact test, sample C, incorporating Kevlar fiber, demonstrated the highest impact energy absorption, followed by samples A and B. This trend can be attributed to the inherent properties of Kevlar fiber, which possesses a notably higher capacity to absorb energy when subjected to high forces. With scanning electron microscope (SEM), the structural morphology of hybrid composites is examined to understand the complex microstructures and interfaces present in the composite materials.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"26 ","pages":"Article 100716"},"PeriodicalIF":0.0,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143948798","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":"Polyethylene glycol-magnetite composite encapsulated concrete as a thermal energy storage","authors":"Achmad M.S. Sebayang ,&nbsp;Syahrul Humaidi ,&nbsp;Timbangen Sembiring ,&nbsp;Anggito P. Tetuko ,&nbsp;Erna Frida ,&nbsp;Perdamean Sebayang ,&nbsp;Martha Rianna ,&nbsp;Amdy Fachredzy ,&nbsp;Muhammad A.H. Nabawi ,&nbsp;Muhammad Fauzi ,&nbsp;Eko A. Setiadi ,&nbsp;Nining S. Asri ,&nbsp;Ayu Yuswita Sari","doi":"10.1016/j.rinma.2025.100720","DOIUrl":"10.1016/j.rinma.2025.100720","url":null,"abstract":"<div><div>Polyethylene glycol (PEG), as an organic PCM, has great potential for Thermal Energy Storage (TES) applications, particularly in concrete. PEG has high latent heat, wide transition temperature range, thermal stability, and biocompatibility. However, the low thermal conductivity of PEG is a disadvantageous. In this study, magnetite (Fe₃O₄) was added as a filler to improve the thermal performance of PEG. The synthesis and homogenization were performed via sonication and magnetic stirring. XRD characterization showed that the PEG-magnetite composite did not undergo any chemical reaction or form new phases. The addition of 45 vol% of magnetite increased the magnetization saturation to 29.84 emu/g and decreased the latent heat to 79.73 %. Thermogravimetric analysis showed an increase in the decomposition temperature of up to 18.54 %. The PEG85 composite sample, with a latent heat of 128.06 J/g and thermal conductivity of 0.407 W/m⋅°C is the most suitable for TES. The novel configuration of tubes encapsulation media to store PEG-magnetite composite improves the capability of the concrete to act as a thermal energy storage.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"26 ","pages":"Article 100720"},"PeriodicalIF":0.0,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090574","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":"Biochar from municipal organic waste: A low-cost adsorbent for Pb2+ and Cu2+ removal from aqueous solutions","authors":"Karen Garces-Porras ,&nbsp;Jessika Corahua Ordoñez ,&nbsp;Veronika Vera-Marmanillo","doi":"10.1016/j.rinma.2025.100715","DOIUrl":"10.1016/j.rinma.2025.100715","url":null,"abstract":"<div><div>Heavy metal contamination is a critical environmental issue, posing severe risks to human health and ecosystems. Adsorption has emerged as a cost-effective and efficient technique for heavy metal removal. This study evaluates the adsorption capacity of biochar produced in a pilot pyrolysis plant using organic waste from Machupicchu, Cusco, Peru, for the removal of lead (Pb²⁺) and copper (Cu²⁺) from aqueous solutions. The biochar was characterized using FTIR, SEM, BET analysis, ICP-MS, and TGA. Adsorption experiments were conducted at different pH values, with an optimal pH of 5. The effects of adsorbent dosage (50–100 mg), contact time (20–60 min), and agitation speed (50–150 rpm) on adsorption capacity were analyzed. ANOVA results confirmed that all factors significantly influenced adsorption. The highest adsorption capacity was obtained at 1.5 g/L biochar dosage, 40 min contact time, and 100 rpm agitation speed, with maximum adsorption capacities of 52.28 ± 1.2 mg/g for Pb²⁺ and 43.73 ± 0.30 mg/g for Cu²⁺, based on the Langmuir isotherm model. These results highlight the potential of biochar from municipal organic waste as a low-cost adsorbent for heavy metal removal.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"26 ","pages":"Article 100715"},"PeriodicalIF":0.0,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903512","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}