Results in Materials最新文献

{"title":"Ab-initio investigation of optical, structural and electronic properties of the cubic perovskite CsCdX3 (X= Cl, Br, I) for potential applications","authors":"Akram Aqili ,&nbsp;Anas Y. Al-Reyahi ,&nbsp;Said Al Azar ,&nbsp;Saber Saad Essaoud ,&nbsp;Mufeed Maghrabi ,&nbsp;Ahmad A. Mousa ,&nbsp;Mohammed Elamin Ketfi ,&nbsp;Nabil Al-Aqtash ,&nbsp;Marwan S. Mousa","doi":"10.1016/j.rinma.2025.100863","DOIUrl":"10.1016/j.rinma.2025.100863","url":null,"abstract":"<div><div>The present work falls within the framework of searching for suitable materials for use in the photovoltaic energy field to modernize solar cells more effectively. The various physical properties of the perovskite compound CsCdX₃ were investigated based on the effects induced by changing the type of the halogen atom Cl, Br or I. The dynamic stability of the structures was checked using phonon implemented in the VASP (Vienna Ab initio Simulation Package) code, where the computed frequencies show positive values for all vibrational modes, which means it is stable. The results demonstrate that all compounds exhibit mechanical stability. Ionic bonds predominate, and they are all isotropic and ductile. In addition, the <em>ab initio</em> calculation method was used to determine structural properties such as crystal cell constants as well as the compressibility coefficient. The electron behavior of the three compounds was identified using well-known approximations, namely GGA-PBE (Generalized Gradient Approximation - Perdew, Burke, and Ernzerhof), mBJ (modified Becke-Johnson), and YS-PBE0 (Yukawa Screened-PBE0 Hybrid Functional). The results show that the three compounds have semi-conductive behavior with a tangible effect of the type of halogen atom on the energy bandgap. The investigated materials show their highest absorption in the ultraviolet region. Thermoelectric analysis indicates that the compounds have a figure of merit of about 0.75 which remains fairly stable with increasing temperature. Thus, the material can be considered in the fabrication of thermoelectric devices or as an absorber layer in the ultraviolet region.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"29 ","pages":"Article 100863"},"PeriodicalIF":0.0,"publicationDate":"2025-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145799847","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":"Leveraging nanopolymer bio-coatings for biodegradable implant systems: An overview","authors":"Victor U. Agbogo ,&nbsp;Emmanuel R. Sadiku ,&nbsp;Lucey Mavhungu ,&nbsp;Williams K. Kupolati ,&nbsp;Moipone L. Teffo ,&nbsp;Oryina M. Injor","doi":"10.1016/j.rinma.2025.100868","DOIUrl":"10.1016/j.rinma.2025.100868","url":null,"abstract":"<div><div>Biodegradable magnesium (Mg) alloys hold great promise as temporary implant materials due to their biocompatibility and mechanical similarity to bone; however, their rapid corrosion in physiological environments limits clinical use. This paper reviews recent advances in nano-polymer bio-coatings designed to enhance the corrosion resistance and functionality of Mg-based implants. A systematic approach was adopted, examining bio-derived polymers reinforced with nanofillers such as carbon nanotubes, nanoclays, and hydroxyapatite. Quantitative findings from selected studies indicate that polymer–nanofiller hybrid coatings can reduce corrosion rates of Mg alloys by up to 65–80 % and improve adhesion strength by approximately 30–40 % compared with conventional coatings. Furthermore, hybrid bio-coatings demonstrated enhanced apatite formation, contributing to improved osseointegration. Conceptual and experimental insights are provided into electrochemical surface modification, bio-macromolecule integration, and the role of functionally graded coatings. The review concludes that nano-polymer coatings represent a sustainable and effective pathway for improving Mg-alloy implants, with future directions pointing toward 3D-printed coating systems, AI-driven coating design, and multifunctional biomedical platforms.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"29 ","pages":"Article 100868"},"PeriodicalIF":0.0,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145799767","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":"Three-dimensional tomographic characterization of nanostructures in aluminum alloy multilayers by small- and wide-angle X-ray scattering","authors":"Kyosuke Hirayama ,&nbsp;Tomoki Miyabe ,&nbsp;Jun Nakajima ,&nbsp;Shan Lin ,&nbsp;Hiroshi Okuda","doi":"10.1016/j.rinma.2025.100870","DOIUrl":"10.1016/j.rinma.2025.100870","url":null,"abstract":"<div><div>In order to enhance the performance and reliability of aluminum-based functionally graded materials (FGMs), it is essential to understand the spatial distribution of nanoscale precipitates and their influence on mechanical properties. In this study, Small-Angle X-ray Scattering Computed Tomography (SAXS-CT) and diffraction CT were applied to visualize and quantify the three-dimensional distribution of nanoscale precipitates and crystallographic orientations in Al–Zn–Mg multilayer plates with compositional gradients. The analysis revealed a clear correlation between the distribution of Guinier radius, integrated scattering intensity, and Zn/Mg content, suggesting aging-dependent structural evolution and localized reversion phenomena in Zn-rich regions. The integration of Vickers hardness tests with SAXS-CT-derived structural parameters facilitated the prediction of local hardness through the application of Orowan and cut-through strengthening models. Furthermore, integration of the Schmid factor derived from diffraction CT allowed the construction of a yield strength map, identifying grains more prone to yielding. In conclusion, three-dimensional SAXS-CT of a three-layer sample with greater thickness confirmed nanoscale structural transitions along the gradient. This study demonstrates the potential of SAXS-CT as a powerful, non-destructive technique for guiding the microstructural design and mechanical optimization of aluminum-based FGMs.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"29 ","pages":"Article 100870"},"PeriodicalIF":0.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145799849","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 investigation of structural, electronic, elastic, thermodynamic, and optical characteristics of novel Fluoro-perovskites FrHF3 (H = Mg, Ca) using DFT calculations","authors":"Laila El haidami,&nbsp;Mohammed Afsi,&nbsp;Hamane Lemziouka,&nbsp;Lamiae Mrharrab","doi":"10.1016/j.rinma.2025.100862","DOIUrl":"10.1016/j.rinma.2025.100862","url":null,"abstract":"<div><div>This study investigates the structural, mechanical, electronic, optical, and thermodynamic properties of FrHF₃ (H = Mg, Ca) perovskites using Density Functional Theory (DFT) with the Generalized Gradient Approximation (GGA) and the Perdew-Burke-Ernzerhof (PBE) exchange-correlation functional. The structural and mechanical stability of these phases is confirmed by their negative formation enthalpy, tolerance factor, and positive phonon dispersion curves, indicating their potential for experimental synthesis. The compounds exhibit direct band gaps, with an increase from 5.932 eV (FrMgF₃) to 6.47 eV (FrCaF₃), influencing their optoelectronic behavior. The electronic structure was analyzed using partial (PDOS) and total (TDOS) density of states to assess electron localization across different energy bands. Additionally, the ELATE program was employed to evaluate elastic tensors and generate 2D and 3D representations. High bulk and Young's moduli suggest promising industrial applications for FrHF₃ (H = Mg, Ca). The analysis of mechanical properties, including Pugh's ratio, Poisson's ratio, and Cauchy pressure, reveals that FrMgF₃ is ductile (Poisson's ratio = 0.31), whereas FrCaF₃ is brittle (Poisson's ratio = 0.25). Both compounds exhibit anisotropic characteristics. Optical properties, including dielectric function, absorption coefficient, optical conductivity, loss function, refractive index, reflectivity, extinction coefficient, transmittance, and absorbance, were examined. The materials demonstrate strong UV absorption, 327,109.25 cm⁻¹ for FrMgF₃ and 302,462.55 cm⁻¹ for FrCaF₃, as well as high optical conductivity, with peak values of 6.66 (1/fs) and 6.30 (1/fs) for FrMgF₃ and FrCaF₃, respectively. Additionally, their significant absorption index makes them suitable for applications in sensors, photodetectors, optoelectronics, and other optical technologies.</div><div>Debye temperatures exceeding 200 K indicate high sound velocities, elevated melting points, and low minimum thermal conductivities, suggesting potential use in thermal barrier coatings (TBCs). Thermodynamic properties, such as specific heat capacity and entropy, were evaluated across a temperature range of 0–1000 K.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"29 ","pages":"Article 100862"},"PeriodicalIF":0.0,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145799769","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":"First principle studies of thermo-physical and optoelectronic properties of LiBP (B = Zn, Mg) Half-Heusler alloys for photovoltaic application","authors":"Kimurgor R. Justus ,&nbsp;Madallah Yusuf ,&nbsp;George S. Manyali ,&nbsp;Felix O. Saouma","doi":"10.1016/j.rinma.2025.100838","DOIUrl":"10.1016/j.rinma.2025.100838","url":null,"abstract":"&lt;div&gt;&lt;div&gt;This study employs first-principles density functional theory (DFT) calculations to investigate the thermophysical and optoelectronic properties of LiBP (B = Zn, Mg) Half-Heusler (HH) alloys, with a focus on their potential photovoltaic and thermoelectric applications. The key findings are their semiconducting nature with direct band gaps of &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;E&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;g&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;34&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mi&gt;eV&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; (LiZnP) and &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;E&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;g&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;34&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mi&gt;eV&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; (LiMgP), calculated using the PBE-GGA functional. Lithium Zinc Phosphide (LiZnP) demonstrates a higher refractive index (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;n&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;37&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;), and a larger dielectric constant, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;ɛ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;i&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;5&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;6&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, and stronger optical absorption and light interaction, making it a promising candidate for high absorption optoelectronic applications. In contrast, Lithium Magnesium Phosphide (LiMgP) offers advantages in transparency and lower thermal conductivity. It exhibits a slightly lower refractive index (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;n&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;29&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;), and a lower dielectric constant (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;ɛ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;i&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;5&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;27&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;). Both materials exhibit mechanical stability, with LiZnP displaying a higher Bulk modulus, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;B&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;637&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;408&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, and Shear modulus, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;G&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;507&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;533&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, making it more incompressible. Both alloys are dynamically stable, as indicated by the absence of imaginary frequencies in the Brillouin zone. LiZnP is particularly advantageous for high-absorption applications, while LiMgP excels in transparency and lower thermal conductivity, with a Debye temperature &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;Θ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;D&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;489&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;7&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; K and average sound velocity, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;V&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;4129&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;696&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mi&gt;m/s&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;. Both materials are brittle, with Pugh’s modulus ratio, &lt;span&gt;&lt;math&gt;&lt;mi&gt;k&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;, less than 1.75, and negative Cauchy pressure, &lt;span&gt;&lt;math&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mo&gt;′&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt;. LiZnP exhibits greater hardness, with a Vickers hardness, &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;H&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;ν&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; of 97.27 compared to 88.46","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"29 ","pages":"Article 100838"},"PeriodicalIF":0.0,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145750171","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":"Rheological insights: A comparative analysis of viscosity determination techniques for liquid silicone rubber injection moulding simulation","authors":"Maurício Azevedo ,&nbsp;Roman C. Kerschbaumer ,&nbsp;Ferdinand Gerstbauer ,&nbsp;Maximiliam Sommer ,&nbsp;Khalid Lamnawar ,&nbsp;Abderrahim Maazouz ,&nbsp;Clemens Holzer","doi":"10.1016/j.rinma.2025.100860","DOIUrl":"10.1016/j.rinma.2025.100860","url":null,"abstract":"<div><div>For successful injection moulding simulations, the viscosity change under shear and various temperatures must be reliably determined in a fashion that is as close as possible to the injection moulding reality. Within this context and motivated by it, this work presents a critical comparison among state-of-the-art methodologies currently employed to determine liquid silicone rubber’s resistance to shear flow: rotation-based (oscillatory and steady modes) and pressure-driven (based on the application of a high pressure capillary rheometer, HPCR). Among these methodologies, the steady shear rotational approach and the HPCR deliver viscosity values that are in accordance with each other. This fact is justified by the sample’s state under shear: the filler structure is disturbed during both experiments, reaching a common ground for viscosity determination. On the other hand, oscillatory experiments under linear viscoelastic conditions deal with a sample with intact filler network under mechanical equilibrium, giving rise to the Cox–Merz proposition disagreement. When non-linear viscoelastic conditions are met, i.e., high strain amplitudes are applied, causing a shift out of mechanical equilibrium, all methodologies lie in the same viscosity trend within a shear range. This correlation can serve as a shortcut for viscosity determination applied to material data characterization, leading to faster experiments and more accurate polymer processing simulations.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"29 ","pages":"Article 100860"},"PeriodicalIF":0.0,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145750080","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":"Adsorption of salicylic acid from ethanol solutions onto activated carbon: Kinetics and equilibrium studies","authors":"Nataliya Korol ,&nbsp;Yuliya Zhukova ,&nbsp;Diana Kulia ,&nbsp;Olha Haleha ,&nbsp;Viktor Yankovych","doi":"10.1016/j.rinma.2025.100866","DOIUrl":"10.1016/j.rinma.2025.100866","url":null,"abstract":"<div><div>This work examines the removal of salicylic acid (SA) from ethanol solutions by activated carbon (AC). Batch adsorption experiments were conducted to determine adsorption kinetics and equilibrium. The adsorption capacity <em>q</em>_<em>e</em> was calculated from concentration changes, and kinetics were analyzed using pseudo-first-order and pseudo-second-order models. Equilibrium data were fitted to Langmuir and Freundlich isotherms. Results showed rapid uptake of SA: over 90 % adsorption occurred within 60 min, reaching equilibrium by ∼180 min. The pseudo-second-order model fitted the kinetic data exceptionally well (R² ~ 0.995), whereas the pseudo-first-order model was poorer (R² ~ 0.86), indicating that chemisorption controls the adsorption rate. Equilibrium behavior followed the Langmuir isotherm (R² ~ 0.993), yielding a high monolayer capacity (∼85 mg g⁻¹). The Freundlich model was less suited (R² ~ 0.89), suggesting relatively uniform binding sites on the carbon. A Weber–Morris diffusion plot showed a two-stage uptake (initial film diffusion and slower intraparticle diffusion). These findings demonstrate that activated carbon effectively adsorbs SA from ethanol, with kinetics and capacity comparable to aqueous systems.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"29 ","pages":"Article 100866"},"PeriodicalIF":0.0,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145799895","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":"Comparative analysis of structural, physicochemical, and electrochemical properties of graphene oxide derived from commercial graphite and rice husk biomass for sensing applications","authors":"Brice Alain Kabore ,&nbsp;Walter K. Njoroge ,&nbsp;Eric Masika ,&nbsp;Matthias M. Minjauw ,&nbsp;Jolien Dendooven ,&nbsp;Christophe Detavernier ,&nbsp;Mieke Adriaens","doi":"10.1016/j.rinma.2025.100867","DOIUrl":"10.1016/j.rinma.2025.100867","url":null,"abstract":"<div><div>This study presents a sustainable route to synthesize graphene oxide (GO) from rice husk biochar (RHB) without hazardous HF/NaOH pretreatment, using a modified Hummers' method. We showed that natural silicate minerals in RHB significantly alter the structure and properties of rice husk-derived GO (RHGO), reducing its electrochemical sensing performance compared to commercial graphite-derived GO (CGGO). Importantly, we demonstrated that a simple, eco-friendly process, decantation followed by electrodeposition, can reduce the adverse effects of silica in RHGO, boosting its sensing performance without needing traditional desilication methods. XPS analysis revealed that RHGO exhibited a higher silicon content of 28 % and oxygen content of 59 %, along with a lower carbon content of 12 %. In contrast, CGGO contained no silicon, 35 % oxygen, and 61 % carbon. These compositional differences indicate that CGGO had a typical GO structure, while RHGO reflected a hybrid SiO2-GO structure. RHGO also showed a larger BET surface area of 83 m²/g and a total pore volume of 0.12 cm³/g, whereas CGGO displayed a surface area of 31 m²/g and a pore volume of 0.02 cm³/g. Electrochemical tests revealed that silicates in RHGO reduced surface functionality and electron transfer between the RHGO carbon paste electrode (CPE) and ferro/ferricyanide ions in KCl solution. However, decantation and electrodeposition of RHGO onto CPE enhanced the peak current by 1.5 times, reduced the peak-to-peak separation by 1.75-fold, and reduced the charge-transfer resistance by 2.6-fold compared with bare CPE, thereby improving electron-transfer kinetics and sensing response. However, CGGO still outperformed RHGO, showing residual silicate effects persist.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"29 ","pages":"Article 100867"},"PeriodicalIF":0.0,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145799897","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":"Congo red loaded carbon aerogel/polypyrrole spent adsorbent in combination with polypyrrole supported carbon aerogel composite adsorbent for removal of Congo red dye from wastewater and for the reuse of latent fingerprint detection","authors":"Eswaran Prabakaran,&nbsp;Kriveshini Pillay","doi":"10.1016/j.rinma.2025.100864","DOIUrl":"10.1016/j.rinma.2025.100864","url":null,"abstract":"<div><div>In this study, a Congo red loaded carbon aerogel/polypyrrole (CR-CA/PPy) spent adsorbent in combination with a polypyrrole supported carbon aerogel composite adsorbent was used for more effective removal of Congo red (CR) dye from wastewater and for reuse in latent fingerprint detection. By wrapping CA in the PPy polymer, a carbon aerogel coated polypyrrole (CA/PPy) composite was created by an adsorption process. To verify the successful formation of the CA/PPy composite various instrument methods were used including Ultraviolet–visible spectroscopy (UV–visible), Fourier Transform Infrared Spectroscopy (FT-IR), X-ray diffraction patterns (XRD), scanning electron microscope (SEM), Transmission electron microscopy (TEM), and Brunauer-Emmett-Teller (BET). The results showed that the specific surface area (7.68 m²/g) of the CA/PPy composite was greater than that of the base materials. Congo red (CR) dye was removed using a batch adsorption approach with this CA/PPy composite as the adsorbent, reaching adsorption equilibrium at pH 6.5 in 180 min. Additionally, the Freundlich isotherm model provided a good fit to the adsorption process occurring on the CA/PPy composite's heterogeneous surface. It was shown that the Freundlich isotherm model more accurately depicted the adsorption processes than the Langmuir isotherm model, with a maximum adsorption capacity of 324.64 mg/g, a high coefficient of determination (R² = 0.9999), and an adsorption intensity factor (1/n = 0.9905). The pseudo-second-order kinetic model most closely matched the adsorption kinetics data. The adsorption of CR dye utilizing the CA/PPy composite showed that the adsorption process was both spontaneous and endothermic, as indicated by the ΔG⁰ and ΔH⁰ values respectively, and the endothermic nature was clearly evident by the most favorable adsorption of CR at 45 °C. It is interesting to note that the CA/PPy composite demonstrated superior reusability during four repeated adsorption/desorption cycles. In order to control pollution, this composite is practically applicable for the adsorptive removal of contaminants such as CR dye from wastewater. Additionally, by employing the powder dusting approach under visible light irradiation, CR-CA/PPy spent adsorbent powder was used for latent fingerprint detection on various porous and non-porous substrates. Moreover, aged and multiple LFP detection tests were conducted on this spent adsorbent powder. As a result, it has been determined that CR-CA/PPy spent adsorbent powder is superior to other fingerprint powders and lowers environmental secondary pollution caused by adsorption treatment methods.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"29 ","pages":"Article 100864"},"PeriodicalIF":0.0,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145939584","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 geosynthetics on embankment performance using finite element modelling - a case study","authors":"Shadman Rahman Sabab ,&nbsp;Hasan Muhommed Ashiq ,&nbsp;Mozaher Ul Kabir ,&nbsp;Syed Shadman Sakib","doi":"10.1016/j.rinma.2025.100869","DOIUrl":"10.1016/j.rinma.2025.100869","url":null,"abstract":"<div><div>Embankment stability is a critical concern in geotechnical engineering, particularly in regions with challenging soil conditions. This study employs finite element modelling using Plaxis2D to evaluate the effectiveness of geotextiles in enhancing embankment performance. The research focuses on embankments with 18°, 27°, and 45° slopes in Teknaf, Bangladesh, an area characterized by soft, clay-rich soils. Expanded Polystyrene (EPS) and Polyethylene Terephthalate (PET) geotextiles were strategically incorporated into the embankments to improve stability. Key factors, including embankment height, slope angle, geotextile properties, and loading conditions, were analyzed in the simulations. The results demonstrated that the geotextile combinations reduce settlement by 48 % and were particularly effective on steeper slopes (45°), increasing embankment stability by 35 %. These findings highlight the potential of geotextiles to significantly reduce settlement and enhance overall stability compared to unreinforced embankments. The study also underscores the critical role of slope angle, showing that steeper slopes demand more reinforcement. This research contributes to a deeper understanding of geotextile applications in embankment construction and offers practical insights for optimizing design and stability in engineering projects.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"29 ","pages":"Article 100869"},"PeriodicalIF":0.0,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145799841","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}