Materials Chemistry and Physics最新文献

{"title":"Synthesis and characterization of a nanocatalyst consisting of tungsten (VI) oxide and ruthenium for potential use in the hydrogen generation via hydrolysis of methylamine-borane","authors":"","doi":"10.1016/j.matchemphys.2024.129944","DOIUrl":"10.1016/j.matchemphys.2024.129944","url":null,"abstract":"<div><p>The demand for effective and safe chemical storage systems as an alternative energy carrier is unabated. This study reports the analysis of methylamine-borane (MeAB) as a new, efficient, and widely applicable technological storage material for mobile applications. Here, we report the preparation of tungsten (VI) oxide (WO₃) supported ruthenium (Ru) nanoparticles (Ru/WO₃) by impregnation-reduction method and their use as a nanocatalyst in the hydrolysis of MeAB for hydrogen (H₂) production. Ru/WO₃ nanocatalyst was characterized by a combination of advanced analytical tools such as XRD, XPS, TEM, TEM-EDX, SEM, and SEM-EDX. Ru/WO₃ nanocatalyst, with an average particle size of 2.16 ± 0.23 nm obtained from TEM analysis, produces H₂ at 298 K with an initial turnover frequency (TOF_{<em>initial</em>}) value of 43.57 min⁻¹ in complete conversion in the hydrolysis of MeAB. In addition, the activation energy (<em>E</em>_<em>a</em>^#), activation enthalpy (<em>ΔH</em>^<em>#</em>) and activation entropy (<em>ΔS</em>^<em>#</em>) values of the Ru/WO₃ nanocatalyst were calculated as in MeAB hydrolysis are 51.54 kJ/mol, 3.7 kJ/mol and 184.57 J/mol × K, respectively, from the Arrhenius and Eyring-Polanyi equations. It was concluded that both the calculated TOF_{<em>initial</em>} value and activation parameters were quite valuable compared to previous catalysts used for MeAB hydrolysis.</p></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142171825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phase formation, microstructure and mechanical properties of TaB2–SiC composites synthesized by reaction hot pressing: Effects of SiC contents and oxygen impurity","authors":"","doi":"10.1016/j.matchemphys.2024.129949","DOIUrl":"10.1016/j.matchemphys.2024.129949","url":null,"abstract":"<div><p>TaB₂–SiC composites with 0–20 wt% SiC contents were prepared by reaction hot pressing using Ta, B and SiC powders as starting materials. Densification, constituent phases, microstructure and mechanical properties, namely Vickers hardness, fracture toughness and flexure strength, were evaluated by means of inspection of sintering shrinkage, density measurement, XRD, SEM, TEM, HRTEM, EDS, SAED, indentation and three-point bending tests. Phase formation, including dominant (TaB₂, SiC) and minor (TaC, glassy SiO₂) phases, was checked by thermodynamic assessment relevant with Ta₂O₅ and B₂O₃ impurities introduced into the reaction system by the starting powders. The results showed that mixtures of Ta, B and SiC powders would initiate self-propagating combustion synthesis (SPCS) at about 900 °C; a transient hold at 800 °C for 1 h could suppress this reaction. Volatilization of B₂O₃ impurity in association with local high temperature due to SPCS helped reduce the TaC and glassy SiO₂ minor phase formation. TaB₂–SiC composites could reach 99 % relative densities with 3 wt% SiC addition and above. Compositions with &lt;7.5 wt% SiC additions showed uniform dispersion of SiC particles at multi-TaB₂ grain junctions while compositions with higher SiC content revealed SiC segregation. Bending strength of 503 MPa and fracture toughness of 6.69 MPa⋅m^1/2 could be reached with 7.5–20 wt% SiC addition.</p></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142233781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of intermittent non-isothermal aging on the microstructure and properties of Al–Zn–Mg–Cu alloy","authors":"","doi":"10.1016/j.matchemphys.2024.129946","DOIUrl":"10.1016/j.matchemphys.2024.129946","url":null,"abstract":"<div><p>The proposition of an intermittent non-isothermal aging (IM-NIA) is an innovative approach to address the challenge of balancing the mechanical properties and corrosion resistance of Al–Zn–Mg–Cu alloys. The effects of IM-NIA on the hardness, corrosion resistance and microstructure morphology of Al–Zn–Mg–Cu alloys were investigated by hardness test, intergranular corrosion test (IGC), exfoliation corrosion test (EXCO), electrochemical corrosion test and combined with transmission electron microscopy (TEM) observation. The results showed that the hardness of the alloy was the highest at 186HV after intermittent post-tempering to 180 °C (IM-H180). The intergranular corrosion depth is the smallest, the corrosion rate is the slowest, and the exfoliation corrosion rating is EA. In addition, the alloy matrix precipitated phase has the smallest average diameter, the highest volume fraction, the strongest ability to repair the passivation film, and the strongest resistance to Cl⁻ erosion; At the same time, the grain boundary precipitation phase is intermittent and multilinear parallel distribution, PFZ is the widest, hindering the anodic corrosion channel, slow corrosion progress and improve corrosion resistance.</p></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142229434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural, morphological, and chemical composition of ternary ZrHfN thin films deposited by reactive co-magnetron sputtering","authors":"","doi":"10.1016/j.matchemphys.2024.129940","DOIUrl":"10.1016/j.matchemphys.2024.129940","url":null,"abstract":"<div><p>This study focuses on a deposited ternary zirconium hafnium nitride (ZrHfN) thin film prepared using the reactive co-magnetron sputtering technique. The effect of the nitrogen (N₂) flow rate on the films' structural, morphological, and chemical composition was investigated. The gracing-incidence X-ray diffraction (GIXRD) showed that all ZrHfN thin films exhibited a crystalline face-centered cubic structure with a strong (111) orientation. With increasing the N₂ flow rate, the film's crystallography changed based on thermodynamic theory. The films demonstrated uniformity and homogeneity in their ternary nitride composition, as confirmed by transmission electron microscopy-energy dispersive X-ray spectroscopy (TEM-EDS) mapping and electron probe microanalyzer (EPMA). Chemical state analysis using X-ray photoelectron spectroscopy (XPS) indicated the presence of both nitride and oxynitride species in all samples. Notably, the atomic concentration of the main elements (Zr, Hf, and N) remained relatively stable over the controlled N₂ flow rate range. However, the N₂ flow rate played a crucial role in forming hafnium nitride and oxynitride chemical states, whereas it did not significantly influence the Zr phases, dominated by Zr oxides. Additionally, the hardness of the ternary ZrHfN thin films exhibited enhancement comparable to typical ternary nitrides.</p></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142162458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation of low-sensitivity explosive composite spheres via oil-in-oil emulsion","authors":"","doi":"10.1016/j.matchemphys.2024.129936","DOIUrl":"10.1016/j.matchemphys.2024.129936","url":null,"abstract":"<div><p>In order to reduce mechanical sensitivity and improve process performance of TKX-50, spherical TKX-50/TATB composite was prepared via the oil-in-oil emulsion method with TKX-50 (Dihydroxylammonium 5,5′-bistetrazole-1,1′-diolate) and TATB (1,3,5-triamino-2,4,6-trinitrobenzene) as raw materials. Based on the experimental results, the ideal circumstances for the emulsion to stabilize were obtained. The SEM results of spherical TKX-50/TATB composite exhibited an excellent spherical structure and size distribution. Furthermore, the SEM, XRD, and FT-IR results of spherical TKX-50/TATB composite demonstrated composite effect of the two basic materials was good. Compared to raw TKX-50 and TATB, the activation energies of spherical TKX-50/TATB composite decreased by 32.75 kJ mol⁻¹ and 33.61 kJ mol⁻¹, respectively. The TKX-50/TATB physical mixture was compared with spherical TKX-50/TATB composite, which had a higher bulk density and flowability. The impact sensitivity H₅₀ of spherical TKX-50/TATB composite was 66.1 cm, which was 50.6 cm higher than that of raw TKX-50, and its friction sensitivity was reduced from 32 % to 24 % compared with that of raw TKX-50.</p></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142169270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Surfactant effects in functionalized multiwall carbon nanotube-filled phase change materials","authors":"","doi":"10.1016/j.matchemphys.2024.129931","DOIUrl":"10.1016/j.matchemphys.2024.129931","url":null,"abstract":"<div><p>Energy storage using phase change materials (PCM) is an efficient way to harness thermal energy from solar energy due to its higher storage density, particularly for medium-temperature applications. However, the PCMs have lower thermal conductivity; owing to this, the thermal performance and heat transfer rate are inadequate. To address this challenge, the current work explores the integration of carbon-based nanoparticles into the PCM to enhance thermal conductivity and overall performance. In the present study, a novel functionalized multi-walled carbon nanotube (FMWCNT) dispersed in organic PCM in different weight fractions (0.1, 0.3, 0.5, 0.7 and 1.0 %) with and without surfactant is investigated. A two-step technique was employed to prepare nano enhanced phase change material (NePCM), with subsequent assessment of its thermophysical properties. Findings reveal a remarkable enhancement in thermal conductivity, with a staggering 150.7 % at 1.0 wt% FMWCNT without surfactant and a substantial 110.2 % improvement in the presence of surfactant. Furthermore, the Ultraviolet–visible spectrum (UV–Vis) demonstrates an 84.56 % reduction in transmittance compared to pure organic PCM. Furthermore, the prepared NePCM are thermally stable up to 405 °C and no chemical reaction takes place. Importantly, the best optimal nanocomposites chemical and thermal properties were evaluated for 500 heating and cooling cycles to ensure reliability. Remarkably, the inclusion of surfactant on FMWCNT enhanced PCM has minimal impact on thermophysical properties.</p></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0254058424010599/pdfft?md5=eb587f2629b0d1fc8016e841fff483fe&pid=1-s2.0-S0254058424010599-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142162457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Method for evaluating healing state of self-healing ceramics using acoustic emission","authors":"","doi":"10.1016/j.matchemphys.2024.129922","DOIUrl":"10.1016/j.matchemphys.2024.129922","url":null,"abstract":"<div><p>Previous studies have evaluated the volume expansion rate of oxidation products and healing temperature and time. However, the bonding strength between the product and the matrix is yet to be appropriately evaluated. To develop a self-healing agent selection method for ceramics, this study proposed a method for examining the healing state and fracture behavior of self-healing ceramics through acoustic emissions (AE) generated during three-point bending tests. This study fabricated completely and incompletely healed SiC30 vol%/Al₂O₃ composite specimens by adjusting the healing time, and the crack length was assessed employing linear fracture mechanics, and effect of healing state on cumulative AE energy and AE frequency. The crack lengths were compared with those of the kinetic model of crack healing. The crack lengths of the 5-h healed specimens were estimated by linear fracture mechanics to be 12.5 μm for incomplete and 10.4 μm for complete healing, while that estimated by the kinetic model were 13.5 μm, indicating the usefulness of the kinetic model in the initial stages of crack healing. Furthermore, while the AE frequency at the initial stage of fracture was dominated by peaks below 100 kHz in damaged or incompletely healed specimen, there was a relatively high frequency peak of over 200 kHz in smooth and completely healed specimen, The average cumulative AE energies of smooth, damaged, 5 h-healed (incompletely), 5 h-healed (completely), and 24 h-healed specimens were 395, 0.89, 26.8, 189, and 318 V・μs, respectively. Thus, the AE energy that accumulated until rupture tended to increase as healing progressed, these findings suggest that the AE method can be used to determine healing conditions. These results will help establish a method for selecting self-healing agents according to the environment in which they are used.</p></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142169269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Composite of Organo-LDH and biochar for diclofenac sodium removal from aqueous solutions","authors":"","doi":"10.1016/j.matchemphys.2024.129919","DOIUrl":"10.1016/j.matchemphys.2024.129919","url":null,"abstract":"<div><p>Classic layered double hydroxides (LDHs) and their composites with biochar are promising adsorbents for removing emerging contaminants like diclofenac sodium (DFS) from water. However, the use of organo-LDHs in these composites remains unexplored and could enhance their adsorption properties for organic molecules. This study investigates the synthesis, characterization, and application of an organo-LDH based on sodium dodecyl sulfate as intercalating agent (SDS-LDH) and its composite with tangerine peel biochar (SDS-LDH/BC) for the removal of DFS from water. The adsorption performance of these materials was compared with those of a composite of SDS-LDH and tangerine peel biomass (SDS-LDH/Bio) and the layered double oxides (LDOs) obtained from the pyrolysis of SDS-LDH and SDS-LDH/Bio, referred to as SDS-LDO and SDS-LDO/Bio, respectively. The materials were characterized by FTIR, XRD, SEM, TG, and pH point of zero charge analyses, and the adsorption of DFS was evaluated in aqueous medium under different conditions. XRD and FTIR demonstrated the successful incorporation of sodium dodecyl sulfate into the interlamellar space of the SDS-LDH, which was preserved in the SDS-LDH/BC and SDS-LDH/Bio composites. SEM analysis revealed that the SDS-LDH structures, with varied shapes and sizes, were dispersed on the matrix of the biochar, while TG analysis showed that the SDS-LDH/BC had similar thermal stability to SDS-LDH. SDS-LDH achieved 90 % DFS removal at pH 8.0 and 25 °C, while SDS-LDH/BC reached 81 % removal under the same conditions, with maximum DFS adsorption capacities of 247 and 169 mg g⁻¹, respectively, outperforming pristine biochar (no removal). Under the same conditions, SDS-LDH/Bio, SDS-LDO/Bio, and SDS-LDO removed 55 %, 36 %, and 36 % of DFS, respectively. These results revealed the pivotal role of the interlamellar structure of SDS-LDH in DFS adsorption, as confirmed by XRD and FTIR, which indicated that DFS interacted with dodecyl sulfate anion in the SDS-LDH interlamellar space, specially through hydrophobic interaction. Kinetics studies revealed that DFS adsorption on SDS-LDH/BC followed the pseudo-first-order model, while adsorption on SDS-LDH followed the pseudo-second-order model, with equilibrium reached in approximately 30 min. The Redlich-Peterson model satisfactorily fitted the adsorption equilibrium isotherms for both SDS-LDH and SDS-LDH/BC. Although no synergistic effect was observed between biochar and SDS-LDH/BC regarding the adsorption capacity, the formation of the SDS-LDH/BC composite improved the preservation of the SDS-LDH structures, allowing for a lower loss of adsorption capacity upon reuse. These findings suggest that the study of such advanced material can contribute to the development of more effective biochar-LDH composite-based adsorbents, specifically for the removal of organic pollutants.</p></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142229433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An approach to fabricate nanomaterials using a closed low-temperature growth system","authors":"","doi":"10.1016/j.matchemphys.2024.129930","DOIUrl":"10.1016/j.matchemphys.2024.129930","url":null,"abstract":"<div><p>This work presents a method for fabricating metallic nanostructures and metal oxides using a closed, low-temperature growth system. The technique uses vacuum thermal evaporation, enabling nanostructure formation under controlled conditions. The growth system features a double-crucible arrangement within a vacuum chamber, allowing precise control of deposition parameters such as temperature, time, and pressure. This innovative approach has successfully produced a variety of nanostructures, including nanoparticles, nanowires, and nanotowers, with materials such as Au, Ge, and Al and oxides such as SnO₂, ZnO, and Al₂O₃. The results emphasize the critical role of substrate temperature in determining the morphology and size of nanostructures, with particular attention paid to the ratio of substrate temperature to the melting point of the fabricated nanomaterial. The work finds that this ratio significantly influences whether the resulting nanostructures form nanoparticles, nanowires, or more complex shapes. Characterization techniques, including field-emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD), confirm the successful fabrication and crystallization of the nanostructures. The ability of the method to control the formation of nanostructures through simple modifications of experimental parameters makes it a promising approach for producing tailor-made nanomaterials for various technological applications.</p></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142151029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nanostructured MnMoO4 as a trifunctional electrocatalyst for overall water splitting and CO2 reduction","authors":"","doi":"10.1016/j.matchemphys.2024.129927","DOIUrl":"10.1016/j.matchemphys.2024.129927","url":null,"abstract":"<div><p>Electrochemical water splitting and CO₂ reduction are important processes to produce hydrogen and low–carbon fuels as renewable energy sources. Here, nanostructured MnMoO₄, prepared by the reflux precipitation method, was investigated as a trifunctional electrocatalyst for overall water splitting and CO₂ reduction reactions. Using a combination of diffuse reflectance spectroscopy and electrochemical impedance spectroscopy results, a direct band gap of 3.05 eV was obtained experimentally for the prepared MnMoO₄. An overpotential of 0.36 V at a current density of 5 mA cm⁻² and a Tafel slope of 58 mV dec⁻¹ were obtained for the oxygen evolution reaction. At a current density of 3 mA cm⁻², overpotentials of 0.39 V and 0.58 V were achieved in the absence and presence of CO₂ bubbling into a 0.1 M KOH solution, respectively, emphasizing the poisoning effect of CO₂ reduction intermediates for the hydrogen evolution reaction. Based on the obtained results, MnMoO₄ could be a promising electrocatalyst for water splitting and CO₂ reduction reactions.</p></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142151088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}