Results in Materials最新文献

{"title":"Recovery of deactivated γ-Al2O3 catalyst used in chlorination of benzene by a hybrid method: Acid washing and thermal treatment","authors":"Sh. Fallahi ,&nbsp;M. Kord ,&nbsp;M. Hajilari ,&nbsp;A. Heidary Moghadam ,&nbsp;T. Pirhoushyaran","doi":"10.1016/j.rinma.2025.100675","DOIUrl":"10.1016/j.rinma.2025.100675","url":null,"abstract":"<div><div>This study implements a hybrid method to revive the deactivated γ-Al₂O₃ catalyst used in the chlorination of waste-recycled benzene in vinyl chloride production by Arvand Petrochemical Company. The method includes chemical and thermal remedies: acid washing and heating under steam. The acidity strength of two different acids, HCl and HNO₃, and furnace temperature are perceived as influential variables in the reviving process in three levels of 0.5, 1, and 1.5 M, and 450, 500, and 550 °C. Characterization analyses including XRD, BET, SEM, and FTIR are employed to compare fresh, deactivated, and revived catalysts. The results suggested that HCl with a concentration of 0.5 M and a furnace temperature of 500 °C triggered the optimal conditions to recover the specific surface area. It is proven that HNO₃ even in the lowest concentration could destroy the catalyst structure. On the contrary, thermal treatment was insufficient to revive the deactivated catalyst.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"26 ","pages":"Article 100675"},"PeriodicalIF":0.0,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A systematic study on enhancing curing times and thermomechanical properties of SYLGARD™ 186","authors":"John R. Stockdale,&nbsp;Santosh Adhikari,&nbsp;Xavier M. Torres,&nbsp;Adam Pacheco,&nbsp;Shelbie A. Legett,&nbsp;Andrea Labouriau","doi":"10.1016/j.rinma.2025.100681","DOIUrl":"10.1016/j.rinma.2025.100681","url":null,"abstract":"<div><div>Sylgard 186 is a versatile polydimethylsiloxane (PDMS) elastomer that is cured via a hydrosilylation reaction. Its room temperature curing time is long, leaving much to be desired in terms of application timeframe. Curing the resin at higher temperatures overcomes this problem, but mechanical properties of the cured elastomer tend to deteriorate. Thus, the present work evaluated chemical modifications to the standard Sylgard 186 with the goal to decrease room temperature curing time while maintaining or improving thermomechanical properties. A modified Sylgard 186 formulation that combines the base component of Sylgard 186 with the curing agent of Sylgard 184 in a 30:1 ratio is introduced. The modified Sylgard 186 elastomer displays, after 4 h of curing at 25 °C, Shore A hardness of 29.5 ± 2.8. These results point to a new, readily available, fast curing Sylgard 186 formulation that has the potential to aid in a wide range of applications including potting within microelectronics, mechanobiology, and aerospace components.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"26 ","pages":"Article 100681"},"PeriodicalIF":0.0,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143776828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Aims and Scope","authors":"","doi":"10.1016/S2590-048X(25)00023-8","DOIUrl":"10.1016/S2590-048X(25)00023-8","url":null,"abstract":"","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"25 ","pages":"Article 100678"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrosion characteristics of heat-treated biomedical grade 316L stainless steel in simulated body fluids","authors":"Ngeleshi Michel Kibambe ,&nbsp;Babatunde Abiodun Obadele ,&nbsp;Bukola Joseph Babalola ,&nbsp;Ufoma Silas Anamu ,&nbsp;Peter Apata Olubambi","doi":"10.1016/j.rinma.2025.100676","DOIUrl":"10.1016/j.rinma.2025.100676","url":null,"abstract":"<div><div>In this study, we investigated the corrosion behaviour of heat-treated biomedical grade 316L Stainless Steel (SS 316L) in simulated body fluids. SS 316L is widely used in biomedical applications due to its excellent mechanical properties and biocompatibility. Nonetheless, concerns about its susceptibility to corrosion in physiological environments persist. To mitigate these concerns, heat treatment was employed to enhance the material's corrosion resistance by modifying its microstructure. Specimens underwent heat treatment at varying temperatures (1050–1200 °C) for 1 h, followed by rapid water cooling. The corrosion behaviour of both untreated and heat-treated samples was assessed using electrochemical techniques, including potentiodynamic polarization and electrochemical impedance spectroscopy, in simulated body fluids with 0.9 % NaCl. The specimen exhibiting optimal corrosion resistance in this solution was further evaluated in Hanks Balanced Salt Solution enriched with Mg²⁺ and Ca²⁺ ions (HBSS⁺). The results highlighted that the specimen subjected to heat treatment at 1200 °C, followed by water quenching (HT1200 °C/1hr/WQ), experienced deterioration due to galvanic effects between the γ-austenite and δ-ferrite phases. Conversely, the specimen heat-treated at 1100 °C, followed by water quenching (HT1100 °C/1hr/WQ), demonstrated the highest corrosion resistance in 0.9 % NaCl, even surpassing the untreated sample. This improved corrosion resistance was attributed to the combination of moderate and uniform grain size and complete transformation to the austenitic phase during heat treatment. However, when the (HT1100 °C/1hr/WQ) specimen was immersed in a more aggressive HBSS⁺ solution, its corrosion resistance deteriorated, suggesting the influence of the medium despite microstructural improvement.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"26 ","pages":"Article 100676"},"PeriodicalIF":0.0,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of compaction force on the mechanical properties of novel mixtures of naturally derived hydroxyapatite ceramics","authors":"Obinna Anayo Osuchukwu ,&nbsp;Emeka Obiora Anisiji ,&nbsp;Precious Osayamen Etinosa ,&nbsp;Ibitoye Opeyemi Isaac ,&nbsp;Peter Gbenga Oni ,&nbsp;Victor D. Aderibigbe ,&nbsp;Kazeem O. Rabiu ,&nbsp;Oladele O. Arogundade ,&nbsp;Oreoluwa Oginni ,&nbsp;David Olubiyi Obada","doi":"10.1016/j.rinma.2025.100672","DOIUrl":"10.1016/j.rinma.2025.100672","url":null,"abstract":"<div><div>The applications of hydroxyapatite (HAp) with remarkable chemical and physico-mechanical properties are important in biomedical engineering. This research studied the effect of compaction force (5,10, and 15 kN) on the crystallographic, physical, and mechanical, properties of ceramics produced from novel mixtures of non-separated animal bones and catfish derived HAp prepared through a sol-gel technique at temperatures of 1050 and 1150°C. The sintering temperatures (1050 and 1150°C) were used to process the powders for 2 h at the heating rate of 5°C/min. The nomenclature of the samples was such that the corresponding temperatures assigned were sometimes ascribed such as B100-1050°C, C100-1050°C, B100-1150°C, C100-1150°C, etc., and in some cases for simplicity, samples with the suffix A referred to variants sintered at 1050°C, while samples with the suffix B referred to variants sintered at 1150°C.The obtained porosities for the samples ranged from 38.22 % (B75/C25-1150°C) to 49.81 % (B100-1050°C). At 1050°C, the highest microhardness recorded for 5 kN was 0.48 GPa (B25/C75), for 10 kN was 0.48 GPa (B25/C75), and for 15 kN was 0.56 GPa (B50/C50). At 1150°C, the highest microhardness recorded for 5 kN was 1.00 GPa (B75/C25), for 10 kN was 0.93 GPa (B100), and for 15 kN was 0.92 GPa (B100). The compressive strengths of sample B100 were the highest at every point of measurement. From the results obtained, a compaction force of 5 kN is recommended to produce bioceramics with suitable physical and mechanical properties for biomedical applications.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"26 ","pages":"Article 100672"},"PeriodicalIF":0.0,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143776827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Crystallinity integration of anatase (TiO2) nanocrystal by whole powder pattern fitting (WPPF) method: A Rietveld refinement study","authors":"Shanawaz Ahmed ,&nbsp;Md. Khalid Hossain Shishir ,&nbsp;Md. Tarikul Islam ,&nbsp;Md. Ashikur Rahaman ,&nbsp;Sahil Aman ,&nbsp;Allah Rakha Aidid ,&nbsp;Sumaiya Islam Sadia ,&nbsp;Md. Masud Rana ,&nbsp;Md. Ashraful Alam","doi":"10.1016/j.rinma.2025.100673","DOIUrl":"10.1016/j.rinma.2025.100673","url":null,"abstract":"<div><div>High crystalline anatase synthesized by a unique simple route using titanium isopropoxide (TTIP) as precursor and isopropyl alcohol (IP) as peptizing agent. The Rietveld refinement analysis showed that the synthesized material is composed of 99.0 % anatase and 1.0 % brookite phases of titanium dioxide (TiO₂). XRD characterized the prominent crystalline phase, providing insights into lattice parameters where a=b= 3.79068 Å, c= 9.50400 Å; α=β=γ= 90.0°; lattice strain 0.718, lattice volume 136.565 Å³, specific surface area 429.26 m²/g, dislocation density 0.0755 nm^{− 2}, preference growth 0.119 and packing efficiency 70.09 %. The most intense diffraction was attributed to the (101) plane at 2θ = 25.39°. The average crystallite size through six identical models those were 3.64 nm (Scherrer equation), 6.47 nm (Williamson-Hall plot) confirming the formation of nano-crystalline anatase. Furthermore, the synthesized anatase exhibited a higher degree of crystallinity at 67.21 % compared to the ICDD standard of 65.06 %. This enhanced crystallinity and other crystallographic data, confirm the successful synthesis of the highly crystalline anatase with improved properties compared to the standard material. The Z-average size of 342.05 nm indicates the hydrodynamic diameter and 63.05 mV zeta potential depicted excellent stability of synthesized anatase in colloidal. The TEM images revealed the uniform crystal growth and average crystallite size ranges in size 8.712 nm. The SAED pattern computed the high crystalline anatase diffracted in individual crystal planes as well as HR-TEM revealed d-spacing 0.3501 nm corresponding to the (101) planes and TEM couple EDS confirmed 100.0 % unified anatase crystal. This research advances the understanding of the controlled synthesis of anatase nanoparticles and demonstrates the effectiveness of characterizing their crystalline structure.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"26 ","pages":"Article 100673"},"PeriodicalIF":0.0,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of calcium and phosphorus base compounds on the characteristic and morphology of in situ synthesized hydroxyapatite-reduced graphene oxide nanocomposite","authors":"Erfan Mohammadipour,&nbsp;Mohammad Ghorbani","doi":"10.1016/j.rinma.2025.100674","DOIUrl":"10.1016/j.rinma.2025.100674","url":null,"abstract":"<div><div>In this investigation, hydroxyapatite/reduced Graphene Oxide (HA/rGO) nanocomposite was synthesized from different methods of calcium and phosphate ions, calcium acetate-calcium glycerophosphate, and calcium nitrate-diammonium hydrogen phosphate. Scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), X-ray powder diffraction (XRD), and Fourier Transform Infrared Spectrometer (FTIR) were used to investigate surface morphology, chemical compositions, phase structures, and chemical structural composition of the powder, respectively. Raman spectroscopy was selected to analyze structural characteristics, which confirms the existence of reduced graphene oxide in the composite. The combination of calcium acetate and calcium glycerophosphate has been used to synthesize HA/rGO nanopowder, which has not been used in previous investigations. This work aims to evaluate the dissimilarities due to the use of diverse precursors of calcium and phosphate ions with the presence of various rGO concentrations, and the modifications in morphology and crystallinity of the HA/rGO composites. We found that, as the graphene concentration in HA/rGO nanocomposites increases, the Ca/P ratio increases due to increasing nucleation sites. Additionally, the interaction between HA and rGO was influenced by the calcium precursor, with calcium acetate-based powders showing stronger hydrogen bonding but increased defects and reduced crystallinity.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"25 ","pages":"Article 100674"},"PeriodicalIF":0.0,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"None-emission carbon nanomaterial derived from polystyrene plastic waste for the adsorption of carbon dioxide","authors":"Kigozi Moses ,&nbsp;Ibrahim Karume ,&nbsp;Simon Bbumba ,&nbsp;Kalakonda Parvathalu ,&nbsp;Gabriel Kasozi ,&nbsp;Emmanuel Tebandeke","doi":"10.1016/j.rinma.2025.100671","DOIUrl":"10.1016/j.rinma.2025.100671","url":null,"abstract":"<div><div>The hydrothermal treatment of polystyrene (P.S.) in the presence of potassium hydroxide resulted in a carbon-based nanomaterial used for an efficient carbon sorbent with a pores volume of 0.068 cm³/g. The material was characterized by different techniques that showed excellent physical and chemical properties. The sorbent's CO₂ capacity at 25 °C is 3.8 mmol/g at 1 bar and 3.0 mmol/g at 0.1 bar, and it regenerates when the temperature reaches 80 ± 5 °C. As a result, this PS-derived organic carbon-related compound exhibited the potential to absorb CO₂ from high-emissions sources. The conversion of plastic waste into carbon-based materials is a promising method for reducing plastic pollution and creating new value from waste. These methods have the potential to make a significant contribution when converted at a large scale as the best sustainable method for waste management.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"26 ","pages":"Article 100671"},"PeriodicalIF":0.0,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143726138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fabrication and characterization of tetra-calcium phosphate from natural wastes of eggshell and cockle shell","authors":"Kaison Harisaeng ,&nbsp;Patamaporn Chaikool ,&nbsp;Yoshiharu Mutoh ,&nbsp;Prinya Chindaprasirt ,&nbsp;Teerawat Laonapakul","doi":"10.1016/j.rinma.2025.100670","DOIUrl":"10.1016/j.rinma.2025.100670","url":null,"abstract":"<div><div>This study focused on the utilization of natural waste materials, specifically eggshell and cockle shell, for extracting calcium carbonate (CaCO₃) as calcium-rich feedstocks for the synthesis of tetra-calcium phosphate (TTCP) via a solid-state reaction. The synthesized TTCP powders were compared with those produced using commercially available CaCO₃. The CaCO₃ powders derived from eggshells and cockle shells were found to exhibit characteristic calcite structures with a high calcium content of 95–96 % and a combination of irregularly shaped amorphous and crystalline morphologies. The TTCP powders synthesized from eggshell- and cockle shell-derived CaCO₃ demonstrated a characteristic high-intensity peak, along with minor phases of hydroxyapatite (HAp) and calcium oxide (CaO). These powders were fine and white with a light-blue tint. It is speculated that the fabricated TTCP powders hold potential for medical applications, such as bone cement.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"25 ","pages":"Article 100670"},"PeriodicalIF":0.0,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of process parameters and material composition of Al2O3-HAP composite using powder metallurgy","authors":"Muhammad Tayyab Bhutta ,&nbsp;Sadaqat Ali ,&nbsp;Malik Adeel Umer ,&nbsp;Aamir Mubashar ,&nbsp;Emad Ud Din ,&nbsp;Adnan Munir ,&nbsp;Abdul Basit","doi":"10.1016/j.rinma.2025.100669","DOIUrl":"10.1016/j.rinma.2025.100669","url":null,"abstract":"<div><div>This work used vacuum sintering and powder metallurgy (PM) to manufacture alumina (Al2O3) and hydroxyapatite (HAP) composite. Alumina's bio-inertness prevented bone ingrowth since it is not osteoinductive. Alumina (Al₂O₃) and hydroxyapatite (HAP) composites with bioinertness and biocompatibility have been created in order to provide a new material for load-bearing biomedical applications with comparatively low lower modulus, appropriate strength, and high biocompatibility. Four composite compositions with alumina concentrations of 60, 70, 80, and 90 % and hydroxyapatite concentrations of 40, 30, 20, and 10 % of the total volume were created for accurate characterization. A ball mill was used to mix the powders, and a hydraulic press was used for cold compaction. The green pellets were vacuum sintered for two, three, and 4 h at temperatures of 1300 °C and 1350 °C. The created composite compositions were examined utilizing elemental analysis to quantify the components and microstructure, as well as OM, FESEM, and XRD methods. The study's findings indicate that adding more HAP reduces the mechanical characteristics of the composites while adding more Al2O3 increases them. Furthermore, it was determined that the composition containing 70 % alumina and 30 % HAP, sintered for 4 h at 1350 °C, was optimal for use in biomedical applications.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"25 ","pages":"Article 100669"},"PeriodicalIF":0.0,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}