Pub Date : 2024-10-16DOI: 10.1016/j.matchemphys.2024.130052
Md Aftabuzzaman , Hwan Kyu Kim
This study focuses on the synthesis and electrochemical characterization of nickel diselenide (NiSe2) as a promising electrode material for supercapacitors. NiSe2 was synthesized through a facile solid-state process involving the mixing of nickel acetylacetonate and selenous acid, followed by drying and sintering at 500 °C under inert conditions. The resulting NiSe2 exhibited a granular structure with worm-like surface architecture and particle size ranging from 20 to 100 nm. The electrochemical performance of NiSe2 was evaluated using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) in a 6 M KOH electrolyte. NiSe2 demonstrated a high specific capacitance of 744.7 F g−1 at a discharge rate of 1 A g−1, with an outstanding rate capability retaining the capacitance of 483.6 F g−1 at 10 A g−1, and exceptional long-term cycling stability. The kinetic analysis revealed that the energy storage mechanism in NiSe2 primarily involves diffusion-controlled charge storage. EIS further confirmed the favorable charge transfer properties of the NiSe2 electrode. Overall, NiSe2 synthesized via the proposed method shows great promise for application in high-performance supercapacitors.
本研究的重点是二硒化镍（NiSe2）的合成和电化学特性，它是一种很有前途的超级电容器电极材料。NiSe2 是通过一种简便的固态工艺合成的，该工艺涉及乙酰丙酮镍和亚硒酸的混合，然后在 500 °C 的惰性条件下进行干燥和烧结。得到的 NiSe2 呈颗粒状结构，表面结构呈蠕虫状，粒径在 20 纳米到 100 纳米之间。在 6 M KOH 电解液中，使用循环伏安法（CV）、电静态充放电法（GCD）和电化学阻抗谱法（EIS）对 NiSe2 的电化学性能进行了评估。NiSe2 在放电速率为 1 A g-1 时的比电容高达 744.7 F g-1，在 10 A g-1 时的比电容保持率为 483.6 F g-1，并且具有出色的长期循环稳定性。动力学分析表明，NiSe2 的储能机制主要涉及扩散控制的电荷存储。EIS 进一步证实了 NiSe2 电极良好的电荷转移特性。总之，通过所提出的方法合成的 NiSe2 在高性能超级电容器中的应用前景广阔。
{"title":"Solid-state synthesis of nickel selenide for high-performance supercapacitors","authors":"Md Aftabuzzaman , Hwan Kyu Kim","doi":"10.1016/j.matchemphys.2024.130052","DOIUrl":"10.1016/j.matchemphys.2024.130052","url":null,"abstract":"<div><div>This study focuses on the synthesis and electrochemical characterization of nickel diselenide (NiSe<sub>2</sub>) as a promising electrode material for supercapacitors. NiSe<sub>2</sub> was synthesized through a facile solid-state process involving the mixing of nickel acetylacetonate and selenous acid, followed by drying and sintering at 500 °C under inert conditions. The resulting NiSe<sub>2</sub> exhibited a granular structure with worm-like surface architecture and particle size ranging from 20 to 100 nm. The electrochemical performance of NiSe<sub>2</sub> was evaluated using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) in a 6 M KOH electrolyte. NiSe<sub>2</sub> demonstrated a high specific capacitance of 744.7 F g<sup>−1</sup> at a discharge rate of 1 A g<sup>−1</sup>, with an outstanding rate capability retaining the capacitance of 483.6 F g<sup>−1</sup> at 10 A g<sup>−1</sup>, and exceptional long-term cycling stability. The kinetic analysis revealed that the energy storage mechanism in NiSe<sub>2</sub> primarily involves diffusion-controlled charge storage. EIS further confirmed the favorable charge transfer properties of the NiSe<sub>2</sub> electrode. Overall, NiSe<sub>2</sub> synthesized via the proposed method shows great promise for application in high-performance supercapacitors.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130052"},"PeriodicalIF":4.3,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533477","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}
Pub Date : 2024-10-16DOI: 10.1016/j.matchemphys.2024.130042
M'bark Elhaid , Hamid Ahchouch , Bouchra Es-Sounni , Omar Id El Mouden , Rachid Salghi , M'hammed Belkhaouda , Mohamed Bakhouch , Siti Fatimah , Mohammed Fahim , Maryam Chafiq , Abdelkarim Chaouiki , Young Gun Ko
Synthesis of transition metal complexes (TMC) having specific characteristics is advantageous for combining their organic and inorganic properties, to help prevent metals from corrosion. In this study, the corrosion inhibition behavior of [N, N′-bis(salicylidene)-2,2-dimethyl-1,3-propanediaminato] copper (II) (CuL) on the surface of XC18 steel surface immersed in 1.0 M HCl was investigated. The thermodynamic and kinetic corrosion parameters were determined using the mass loss (ML) and electrochemical measurement methods. CuL exhibited a good corrosion inhibition efficiency of 96.72 %. The adsorption behavior of CuL followed the Langmuir isotherm model, indicating both physical and chemical interactions. Morphological structural analysis demonstrated that CuL formed a protective film between the surface of XC18 steel and the corrosives elements, thus confirming its adsorption onto XC18 steel surface. Theoretical calculations were consistent with the experimental findings, thereby confirming that the adsorption of CuL onto the steel surface comprises both physisorption and chemisorption processes. These calculations elucidate the specific bonding nature and emphasize the significant inter- and intra-molecular interactions that enhance the stability and adsorption capability of the CuL inhibitor. The successful formation of a protective layer on the surface of XC18 steel using a TMC signifies exciting prospects for the development of advanced materials with diverse applications.
{"title":"Surface functionalization of XC18 steel using a new transition metal complex for remarkable corrosion performance: Empirical and theoretical studies","authors":"M'bark Elhaid , Hamid Ahchouch , Bouchra Es-Sounni , Omar Id El Mouden , Rachid Salghi , M'hammed Belkhaouda , Mohamed Bakhouch , Siti Fatimah , Mohammed Fahim , Maryam Chafiq , Abdelkarim Chaouiki , Young Gun Ko","doi":"10.1016/j.matchemphys.2024.130042","DOIUrl":"10.1016/j.matchemphys.2024.130042","url":null,"abstract":"<div><div>Synthesis of transition metal complexes (TMC) having specific characteristics is advantageous for combining their organic and inorganic properties, to help prevent metals from corrosion. In this study, the corrosion inhibition behavior of [N, N′-bis(salicylidene)-2,2-dimethyl-1,3-propanediaminato] copper (II) (CuL) on the surface of XC18 steel surface immersed in 1.0 M HCl was investigated. The thermodynamic and kinetic corrosion parameters were determined using the mass loss (ML) and electrochemical measurement methods. CuL exhibited a good corrosion inhibition efficiency of 96.72 %. The adsorption behavior of CuL followed the Langmuir isotherm model, indicating both physical and chemical interactions. Morphological structural analysis demonstrated that CuL formed a protective film between the surface of XC18 steel and the corrosives elements, thus confirming its adsorption onto XC18 steel surface. Theoretical calculations were consistent with the experimental findings, thereby confirming that the adsorption of CuL onto the steel surface comprises both physisorption and chemisorption processes. These calculations elucidate the specific bonding nature and emphasize the significant inter- and intra-molecular interactions that enhance the stability and adsorption capability of the CuL inhibitor. The successful formation of a protective layer on the surface of XC18 steel using a TMC signifies exciting prospects for the development of advanced materials with diverse applications.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130042"},"PeriodicalIF":4.3,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533481","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}
Pub Date : 2024-10-16DOI: 10.1016/j.matchemphys.2024.130045
Yunfei Yan , Yongbo Li , Jingxiang You , Kaiming Shen , Wanyi Chen , Lixian Li
Magnetic hyperthermia therapy (MHT) represents an innovative approach to cancer treatment, harnessing the therapeutic capabilities of magnetic nanoparticles. Fe3O4 nanoparticles are often considered ideal candidates for MHT because of their biocompatibility. However, the clinical application of Fe3O4 nanoparticles is hindered by their low heating efficiency and concerns regarding potential toxicity linked to the high concentrations required to achieve therapeutic effects. In this study, two unique structures, hollow spherical and nanoflower Fe3O4, were successfully synthesized to enhance their magnetothermal conversion efficiency. The results indicate that Fe3O4 nanoflowers exhibit an intrinsic loss power (ILP) value of 6.52, which is 1.83 times greater than the ILP of hollow spherical Fe3O4 (3.55), indicating its enhanced potential for MHT applications. The COMSOL simulation demonstrated that higher magnetic field frequencies and intensities elevate tissue temperature and damage in tumor cells, particularly at 100 kHz and 400 kHz, with tumor tissue damage scores rising to 0.28 and 0.93, respectively. Shorter heating durations, such as 6 min, minimize harm to healthy tissue and are ideal for treatments requiring multiple sessions. After 12 min, tumor scores rose to 0.85, while normal tissue scores were 0.34, suggesting that longer durations improve therapeutic effects on tumors but also heighten the risk to healthy cells. This research provides a scientific foundation for selecting materials in the context of MHT for cancer treatment, potentially paving the way for more effective and safer therapeutic strategies.
{"title":"Morphology-dependent magnetic hyperthermia characteristics of Fe3O4 nanoparticles","authors":"Yunfei Yan , Yongbo Li , Jingxiang You , Kaiming Shen , Wanyi Chen , Lixian Li","doi":"10.1016/j.matchemphys.2024.130045","DOIUrl":"10.1016/j.matchemphys.2024.130045","url":null,"abstract":"<div><div>Magnetic hyperthermia therapy (MHT) represents an innovative approach to cancer treatment, harnessing the therapeutic capabilities of magnetic nanoparticles. Fe<sub>3</sub>O<sub>4</sub> nanoparticles are often considered ideal candidates for MHT because of their biocompatibility. However, the clinical application of Fe<sub>3</sub>O<sub>4</sub> nanoparticles is hindered by their low heating efficiency and concerns regarding potential toxicity linked to the high concentrations required to achieve therapeutic effects. In this study, two unique structures, hollow spherical and nanoflower Fe<sub>3</sub>O<sub>4</sub>, were successfully synthesized to enhance their magnetothermal conversion efficiency. The results indicate that Fe<sub>3</sub>O<sub>4</sub> nanoflowers exhibit an intrinsic loss power (ILP) value of 6.52, which is 1.83 times greater than the ILP of hollow spherical Fe<sub>3</sub>O<sub>4</sub> (3.55), indicating its enhanced potential for MHT applications. The COMSOL simulation demonstrated that higher magnetic field frequencies and intensities elevate tissue temperature and damage in tumor cells, particularly at 100 kHz and 400 kHz, with tumor tissue damage scores rising to 0.28 and 0.93, respectively. Shorter heating durations, such as 6 min, minimize harm to healthy tissue and are ideal for treatments requiring multiple sessions. After 12 min, tumor scores rose to 0.85, while normal tissue scores were 0.34, suggesting that longer durations improve therapeutic effects on tumors but also heighten the risk to healthy cells. This research provides a scientific foundation for selecting materials in the context of MHT for cancer treatment, potentially paving the way for more effective and safer therapeutic strategies.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130045"},"PeriodicalIF":4.3,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533478","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}
Pub Date : 2024-10-16DOI: 10.1016/j.matchemphys.2024.130044
Ali Soleimani, Mehdi Delshad Chermahini, Sobhan Yavari
The lead-free x NiFe2O4 – (1-x) BaTiO3 (x = 0, 0.05, 0.1, 0.15) multiferroic composites were prepared via the solid-state sintering technique. Microstructure, multiferroic, and magnetodielectric properties of composites were investigated. According to the XRD data (from x = 5 to 15 wt%), the tetragonality factor (cT/aT) and unit cell volume of the BaTiO3 (BTO) crystal system diminished. Based on SEM images, ferromagnetic NiFe2O4 (NFO) grains are uniformly dispersed in the ferroelectric BTO matrix without additional reaction in the interfaces of two phases. The highest values of dielectric (dielectric constant (εr) ∼ 1905 and dielectric loss factor (tan δ) ∼ 0.049) and ferroelectric properties (saturation polarization (PS) ∼ 13 μC/cm2 and remnant polarization (Pr) ∼ 10 μC/cm2) are attained for x = 5 wt% due to the lowest NFO (non-ferroelectric) concentration. Also, with increasing ferrite concentration (up to 15 wt%), the ferroelectric properties of the composites show a gradual decrease. The saturation magnetization (MS) values rise due to increasing ferrite concentration (from 2 to 5 emu/g for x = 5 to 15 wt%). Moreover, coercivity (HC) drops from 150 to 110 Oe. The simultaneous observation of the ferroelectric and ferromagnetic characteristic hysteresis loops confirmed the multiferroic effect for x = 5, 10, and 15 wt%. The highest magnetodielectric constant (3 %) is obtained for x = 15 wt% multiferroic composite at the applied magnetic field of 6 kOe.
{"title":"A study on BaTiO3 – NiFe2O4 composite; microstructure, multiferroic and magnetodielectric properties","authors":"Ali Soleimani, Mehdi Delshad Chermahini, Sobhan Yavari","doi":"10.1016/j.matchemphys.2024.130044","DOIUrl":"10.1016/j.matchemphys.2024.130044","url":null,"abstract":"<div><div>The lead-free <em>x</em> NiFe<sub>2</sub>O<sub>4</sub> – <em>(1-x)</em> BaTiO<sub>3</sub> (<em>x</em> = 0, 0.05, 0.1, 0.15) multiferroic composites were prepared via the solid-state sintering technique. Microstructure, multiferroic, and magnetodielectric properties of composites were investigated. According to the XRD data (from <em>x</em> = 5 to 15 wt%), the tetragonality factor (<em>c</em><sub><em>T</em></sub><em>/a</em><sub><em>T</em></sub>) and unit cell volume of the BaTiO<sub>3</sub> (BTO) crystal system diminished. Based on SEM images, ferromagnetic NiFe<sub>2</sub>O<sub>4</sub> (NFO) grains are uniformly dispersed in the ferroelectric BTO matrix without additional reaction in the interfaces of two phases. The highest values of dielectric (dielectric constant (<em>ε</em><sub><em>r</em></sub>) ∼ 1905 and dielectric loss factor (tan δ) ∼ 0.049) and ferroelectric properties (saturation polarization (<em>P</em><sub><em>S</em></sub>) ∼ 13 μC/cm<sup>2</sup> and remnant polarization (<em>P</em><sub><em>r</em></sub>) ∼ 10 μC/cm<sup>2</sup>) are attained for <em>x</em> = 5 wt% due to the lowest NFO (non-ferroelectric) concentration. Also, with increasing ferrite concentration (up to 15 wt%), the ferroelectric properties of the composites show a gradual decrease. The saturation magnetization (<em>M</em><sub><em>S</em></sub>) values rise due to increasing ferrite concentration (from 2 to 5 emu/g for <em>x</em> = 5 to 15 wt%). Moreover, coercivity (<em>H</em><sub><em>C</em></sub>) drops from 150 to 110 Oe. The simultaneous observation of the ferroelectric and ferromagnetic characteristic hysteresis loops confirmed the multiferroic effect for <em>x</em> = 5, 10, and 15 wt%. The highest magnetodielectric constant (3 %) is obtained for <em>x</em> = 15 wt% multiferroic composite at the applied magnetic field of 6 kOe.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130044"},"PeriodicalIF":4.3,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533483","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}
Present study aimed at experimental investigation of microstructural evolution, microhardness profile, tensile and impact properties of friction stir welded (FSW) joints of 2219Al alloys microalloyed with varying (up to 0.1 wt%) Cd contents. FSW was performed on the cast and homogenized alloys. Microstructural analysis from weld line up to base metal, identified three sequential heat affected weld zones having separate grain morphologies, namely Weld Nugget Zone (WNZ), Thermo-Mechanical Affected Zone (TMAZ) and Heat Affected Zone (HAZ). Vickers microhardness value increased from weld line towards the WNZ, then decreased towards the TMAZ, and finally increased through HAZ towards the base metal, which exhibited higher hardness compared to all the heat affected weld zones. Microhardness, yield and tensile strengths of the FSW joint of 2219Al alloy increased, due to microalloying with 0.06 wt% of Cd contents, which was attributed to continuous grain refinement. While tensile ductility and toughness, and impact toughness of the welded joint reduced, resulting from trace additions of Cd. Investigated alloys retained significant mechanical strength, ductility and toughness, on the respective joints, following to the FSW operation. Cd was observed to be a potential microalloying element to control the microstructure, refine grain size and improve mechanical strength and hardness of the welded joint of 2219Al alloy. Present experimental results established a structure-property correlation, in order to validate potential application of FSW technique on investigated 2219Al alloys with trace additions of Cd, to attain desirable weld-quality avoiding welding imperfections.
{"title":"Structure-property correlation for friction stir welded joints of 2219Al alloys microalloyed with Cd","authors":"Sanjib Gogoi , Sanjib Banerjee , Rakesh Bhadra , Arpan Kumar Mondal , Priyam Roy","doi":"10.1016/j.matchemphys.2024.130051","DOIUrl":"10.1016/j.matchemphys.2024.130051","url":null,"abstract":"<div><div>Present study aimed at experimental investigation of microstructural evolution, microhardness profile, tensile and impact properties of friction stir welded (FSW) joints of 2219Al alloys microalloyed with varying (up to 0.1 wt%) Cd contents. FSW was performed on the cast and homogenized alloys. Microstructural analysis from weld line up to base metal, identified three sequential heat affected weld zones having separate grain morphologies, namely Weld Nugget Zone (<em>WNZ</em>), Thermo-Mechanical Affected Zone (<em>TMAZ</em>) and Heat Affected Zone (<em>HAZ</em>). Vickers microhardness value increased from weld line towards the <em>WNZ</em>, then decreased towards the <em>TMAZ</em>, and finally increased through <em>HAZ</em> towards the base metal, which exhibited higher hardness compared to all the heat affected weld zones. Microhardness, yield and tensile strengths of the FSW joint of 2219Al alloy increased, due to microalloying with 0.06 wt% of Cd contents, which was attributed to continuous grain refinement. While tensile ductility and toughness, and impact toughness of the welded joint reduced, resulting from trace additions of Cd. Investigated alloys retained significant mechanical strength, ductility and toughness, on the respective joints, following to the FSW operation. Cd was observed to be a potential microalloying element to control the microstructure, refine grain size and improve mechanical strength and hardness of the welded joint of 2219Al alloy. Present experimental results established a structure-property correlation, in order to validate potential application of FSW technique on investigated 2219Al alloys with trace additions of Cd, to attain desirable weld-quality avoiding welding imperfections.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130051"},"PeriodicalIF":4.3,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533583","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}
This research highlights the novelty of using dolomite as an Mg(OH)2 source for synthesizing GO/Mg(OH)2 nanocomposite, a dye adsorbent and supercapacitor material. So far, dolomite has only been conventionally used as fertilizer and building material. By utilizing dolomite as Mg(OH)2 raw materials, this nanocomposite shows high efficiency in removing methylene blue (MB) up to 97 % with adsorption kinetics following a pseudo-second-order model. At an optimal pH of 5, this material can be used repeatedly with satisfactory results. For supercapacitor applications, GO/Mg(OH)2 has a specific capacitance of 117.80 F g−1 at a current density of 0.5 A g−1 and 90 % cyclic capacity retention, making it an excellent candidate in modern energy storage technology.
{"title":"Graphene oxide modified with magnesium hydroxide derived from dolomites for dyes adsorptions and supercapacitor","authors":"Fariz Irkham Muadhif , Murni Handayani , Muhammad Aulia Anggoro , Yosephin Dewiani Rahmayanti , Desinta Dwi Ristiana , Khusnul Khotimah , Isa Anshori , Agung Esmawan , Achiar Faris , Lytha Rizqika Lailia , Gagus Ketut Sunnardianto , Grace Gita Redhyka , Wahyu Bambang Widayatno , Riesca Ayu Kusuma Wardhani , Lydia Rohmawati","doi":"10.1016/j.matchemphys.2024.130041","DOIUrl":"10.1016/j.matchemphys.2024.130041","url":null,"abstract":"<div><div>This research highlights the novelty of using dolomite as an Mg(OH)<sub>2</sub> source for synthesizing GO/Mg(OH)<sub>2</sub> nanocomposite, a dye adsorbent and supercapacitor material. So far, dolomite has only been conventionally used as fertilizer and building material. By utilizing dolomite as Mg(OH)<sub>2</sub> raw materials, this nanocomposite shows high efficiency in removing methylene blue (MB) up to 97 % with adsorption kinetics following a pseudo-second-order model. At an optimal pH of 5, this material can be used repeatedly with satisfactory results. For supercapacitor applications, GO/Mg(OH)<sub>2</sub> has a specific capacitance of 117.80 F g<sup>−1</sup> at a current density of 0.5 A g<sup>−1</sup> and 90 % cyclic capacity retention, making it an excellent candidate in modern energy storage technology.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130041"},"PeriodicalIF":4.3,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532962","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}
Pub Date : 2024-10-15DOI: 10.1016/j.matchemphys.2024.130046
Mingjin Wu , Bingqian Li
The microstructure evolution, micro-arc oxidation (MAO) performance, and corrosion behavior of Al–Mg-Sc alloy friction stir welded (FSW) joint were investigated. The microstructure observations indicated that compared with the base metal (BM), the stirring zone (SZ) and thermo-mechanical affected zone (TMAZ) showed notable grain defects and an enormous number of high angle grain boundaries (HAGBs). Additionally, a more conspicuous presence of non-uniform recrystallized grains and HAGBs was noticed in the thickness direction within the SZ. FSW process induced the precipitation of Al3Mg2 (β phase) at grain boundaries in the heat-affected zone (HAZ) of joint. The microstructural changes and precipitation induced by the FSW process influenced the electrical conductivity, resulting in the differences in micro-arc discharge in various zones of the FSW joint in MAO process, which in turn affected the thickness, porosity, and corrosion resistance of MAO ceramic film. HRTEM observation suggested that a transition layer composed of nanocrystalline and amorphous Al2O3 with average thickness of 2–4 nm was found at the film/substrate interface. Electrochemical tests suggested that a heterogeneous structure in various regions of FSW joint resulted in varying susceptibility to localized corrosion. HAZ/TMAZ had the worst anti-corrosion performance. After MAO treatment, the anti-corrosion performance of SZ and HAZ/TMAZ in FSW joint was significantly improved, especially SZ.
研究了铝镁钪合金搅拌摩擦焊（FSW）接头的微观组织演变、微弧氧化（MAO）性能和腐蚀行为。显微组织观察结果表明，与母材（BM）相比，搅拌区（SZ）和热机械影响区（TMAZ）出现了明显的晶粒缺陷和大量高角度晶界（HAGB）。此外，在 SZ 内的厚度方向上，非均匀再结晶晶粒和 HAGB 的存在更为明显。在接头热影响区（HAZ）的晶界处，FSW 过程诱发了 Al3Mg2（β 相）的析出。FSW 过程引起的微观结构变化和析出影响了导电性，导致 MAO 过程中 FSW 接头不同区域的微弧放电存在差异，进而影响了 MAO 陶瓷膜的厚度、孔隙率和耐腐蚀性。HRTEM 观察表明，在薄膜/基底界面上发现了由纳米晶和无定形 Al2O3 组成的过渡层，平均厚度为 2-4 nm。电化学测试表明，FSW 接头不同区域的异质结构导致对局部腐蚀的敏感性不同。HAZ/TMAZ 的抗腐蚀性能最差。经过 MAO 处理后，SZ 和 HAZ/TMAZ 在 FSW 接头中的抗腐蚀性能明显改善，尤其是 SZ。
{"title":"Microstructure, MAO performance, interfacial characteristics and corrosion behavior of FSW joint of Al–Mg-Sc alloy","authors":"Mingjin Wu , Bingqian Li","doi":"10.1016/j.matchemphys.2024.130046","DOIUrl":"10.1016/j.matchemphys.2024.130046","url":null,"abstract":"<div><div>The microstructure evolution, micro-arc oxidation (MAO) performance, and corrosion behavior of Al–Mg-Sc alloy friction stir welded (FSW) joint were investigated. The microstructure observations indicated that compared with the base metal (BM), the stirring zone (SZ) and thermo-mechanical affected zone (TMAZ) showed notable grain defects and an enormous number of high angle grain boundaries (HAGBs). Additionally, a more conspicuous presence of non-uniform recrystallized grains and HAGBs was noticed in the thickness direction within the SZ. FSW process induced the precipitation of Al<sub>3</sub>Mg<sub>2</sub> (β phase) at grain boundaries in the heat-affected zone (HAZ) of joint. The microstructural changes and precipitation induced by the FSW process influenced the electrical conductivity, resulting in the differences in micro-arc discharge in various zones of the FSW joint in MAO process, which in turn affected the thickness, porosity, and corrosion resistance of MAO ceramic film. HRTEM observation suggested that a transition layer composed of nanocrystalline and amorphous Al<sub>2</sub>O<sub>3</sub> with average thickness of 2–4 nm was found at the film/substrate interface. Electrochemical tests suggested that a heterogeneous structure in various regions of FSW joint resulted in varying susceptibility to localized corrosion. HAZ/TMAZ had the worst anti-corrosion performance. After MAO treatment, the anti-corrosion performance of SZ and HAZ/TMAZ in FSW joint was significantly improved, especially SZ.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130046"},"PeriodicalIF":4.3,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142444636","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}
Pub Date : 2024-10-15DOI: 10.1016/j.matchemphys.2024.130003
Danielle Assis , Olavo Cardozo , Ricardo Maia Jr. , Severino Alves Jr. , Celso Pinto de Melo , Romário Justino , Andreas Stingl , Patricia M.A. Farias
Chitosan thin films doped with varying concentrations (0, 2, 5, 7, and 10 %) of silver-doped zinc oxide (Ag@ZnO) nanoparticles (NPs) were synthesized using the Solution Casting method. Analyses revealed that increased doping enhanced the films’ physical, electrical, and structural properties. X-ray diffraction (XRD) confirmed the wurtzite hexagonal structure of Ag@ZnO NPs. Photoluminescence showed charge transfer between chitosan and NPs, with emissions in the blue and violet ranges. UV–VIS spectroscopy indicated improved barrier effects, while Tauc plot analysis showed a decrease in the band gap with higher doping. Fourier-transform infrared (FT-IR) analysis confirmed strong interactions between chitosan and nanoparticles. Impedance testing demonstrated increased conductivity with higher Ag@ZnO NP concentrations. These results suggest that doping chitosan films with Ag@ZnO NPs effectively modulates impedance and conductivity while maintaining flexibility, making them suitable for efficient electrolyte separators in supercapacitors.
{"title":"Enhanced physical, electrical, and structural properties of chitosan thin films doped with Ag@ZnO nanoparticles for energy storage applications","authors":"Danielle Assis , Olavo Cardozo , Ricardo Maia Jr. , Severino Alves Jr. , Celso Pinto de Melo , Romário Justino , Andreas Stingl , Patricia M.A. Farias","doi":"10.1016/j.matchemphys.2024.130003","DOIUrl":"10.1016/j.matchemphys.2024.130003","url":null,"abstract":"<div><div>Chitosan thin films doped with varying concentrations (0, 2, 5, 7, and 10 %) of silver-doped zinc oxide (Ag@ZnO) nanoparticles (NPs) were synthesized using the Solution Casting method. Analyses revealed that increased doping enhanced the films’ physical, electrical, and structural properties. X-ray diffraction (XRD) confirmed the wurtzite hexagonal structure of Ag@ZnO NPs. Photoluminescence showed charge transfer between chitosan and NPs, with emissions in the blue and violet ranges. UV–VIS spectroscopy indicated improved barrier effects, while Tauc plot analysis showed a decrease in the band gap with higher doping. Fourier-transform infrared (FT-IR) analysis confirmed strong interactions between chitosan and nanoparticles. Impedance testing demonstrated increased conductivity with higher Ag@ZnO NP concentrations. These results suggest that doping chitosan films with Ag@ZnO NPs effectively modulates impedance and conductivity while maintaining flexibility, making them suitable for efficient electrolyte separators in supercapacitors.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130003"},"PeriodicalIF":4.3,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533585","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}
Pub Date : 2024-10-15DOI: 10.1016/j.matchemphys.2024.130016
Mohamad Hasan Aleinawi , Eminenur Saritas , Maria Stefan , Ameen Uddin Ammar , Abdalla Hroub , Feray Bakan Misirlioglu , Amelia Bocirnea , Sergiu Macavei , Septimiu Tripon , Emre Erdem , Rostas Arpad Mihai
Recently, perovskites have become a hotspot for researchers attempting to exploit metal and oxygen vacancies in structures of the form MTiO3, facilitating the convenient electron/hole migration, thus displaying interesting properties. Magnesium Titanate (MgTiO3) is a prominent part of the perovskite class, exhibiting remarkable electrical, thermal, and chemical properties. Undoped and Mn-doped MgTiO3 samples were obtained using a solid-state reaction starting from previously synthesized MgO and TiO2 powders, which were separately doped with different Mn ion concentrations. The resulting multiphase materials with a major MgTiO3 phase were thoroughly morpho-structurally analyzed employing XRD, STEM, Raman, PL, XPS, and EPR spectroscopy. The electrochemical results indicate that they show superior performance when used as electrode materials for supercapacitor application due to the high defect concentration as shown in EPR and PL spectroscopy and the ferroelectric behavior observed in XPS and XRD. When used in symmetric and asymmetric supercapacitor devices, they show promising results, with specific capacity values reaching up to 109 F/g for the symmetric and 609 F/g for the asymmetric devices, while energy and power density values reached 84.7 Wh/kg and 90.8 kW/kg respectively, proving a great potential in the energy storage field.
{"title":"Supercapacitor devices based on multiphase MgTiO3 perovskites doped with Mn2+ ions","authors":"Mohamad Hasan Aleinawi , Eminenur Saritas , Maria Stefan , Ameen Uddin Ammar , Abdalla Hroub , Feray Bakan Misirlioglu , Amelia Bocirnea , Sergiu Macavei , Septimiu Tripon , Emre Erdem , Rostas Arpad Mihai","doi":"10.1016/j.matchemphys.2024.130016","DOIUrl":"10.1016/j.matchemphys.2024.130016","url":null,"abstract":"<div><div>Recently, perovskites have become a hotspot for researchers attempting to exploit metal and oxygen vacancies in structures of the form MTiO<sub>3</sub>, facilitating the convenient electron/hole migration, thus displaying interesting properties. Magnesium Titanate (MgTiO<sub>3</sub>) is a prominent part of the perovskite class, exhibiting remarkable electrical, thermal, and chemical properties. Undoped and Mn-doped MgTiO<sub>3</sub> samples were obtained using a solid-state reaction starting from previously synthesized MgO and TiO<sub>2</sub> powders, which were separately doped with different Mn ion concentrations. The resulting multiphase materials with a major MgTiO<sub>3</sub> phase were thoroughly morpho-structurally analyzed employing XRD, STEM, Raman, PL, XPS, and EPR spectroscopy. The electrochemical results indicate that they show superior performance when used as electrode materials for supercapacitor application due to the high defect concentration as shown in EPR and PL spectroscopy and the ferroelectric behavior observed in XPS and XRD. When used in symmetric and asymmetric supercapacitor devices, they show promising results, with specific capacity values reaching up to 109 F/g for the symmetric and 609 F/g for the asymmetric devices, while energy and power density values reached 84.7 Wh/kg and 90.8 kW/kg respectively, proving a great potential in the energy storage field.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130016"},"PeriodicalIF":4.3,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533579","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}
Nowadays, biomaterial composites for bone tissue engineering are developing rapidly. Many research studies have been done on hydroxyapatite (HA) and collagen because these materials are biomimetic and can be used in human bones. This study aimed to characterize a three-dimensional (3D) printed hydroxyapatite/collagen composite slurry material with a ratio of 99.84 % (w/v) and 0.16 % (w/v). The composite material was printed using 3D printing with a print speed of 10 mm/min and a layer height of 0.5 mm. Characterization layers were investigated using a scanning electron microscope (SEM), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), energy dispersive X-ray (EDX), and thermogravimetric analysis (TGA). SEM showed the occurrence of overlapping between layers, which was investigated by the reduction in layer dimensions after printing (layer size 432 μm). Moreover, there were no boundaries between layers; the connection between layers occurred, and porosity and the rough surface were presented. FTIR analyses showed spectrum peaks at 559.36, 628.79, 1022.27, 1562.34, and 1639.49 cm−1 which was confirmed as hydroxyapatite and amide (indicates the presence of spectrum collagen). The XRD pattern peaks show the crystallinity of HA/collagen composite (41 %) and HA (42 %). The Ca/P ratio of the material composite was 1.77. The ratio was osteoconductive, and this characteristic was the main requirement for bone grafts. From TGA, the weight loss occurred between temperatures of 25 °C and 1000 °C with three stages: water absorption (1.844 %), removal of organic content (2.854 %), and decomposition of inorganic compounds (3.517 %).
{"title":"Characterization of three-dimensional printed hydroxyapatite/collagen composite slurry","authors":"Nurbaiti , M.K. Herliansyah , A.E. Tontowi , M.G. Widiastuti , H.V. Hoten , D.P. Perkasa","doi":"10.1016/j.matchemphys.2024.130047","DOIUrl":"10.1016/j.matchemphys.2024.130047","url":null,"abstract":"<div><div>Nowadays, biomaterial composites for bone tissue engineering are developing rapidly. Many research studies have been done on hydroxyapatite (HA) and collagen because these materials are biomimetic and can be used in human bones. This study aimed to characterize a three-dimensional (3D) printed hydroxyapatite/collagen composite slurry material with a ratio of 99.84 % (w/v) and 0.16 % (w/v). The composite material was printed using 3D printing with a print speed of 10 mm/min and a layer height of 0.5 mm. Characterization layers were investigated using a scanning electron microscope (SEM), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), energy dispersive X-ray (EDX), and thermogravimetric analysis (TGA). SEM showed the occurrence of overlapping between layers, which was investigated by the reduction in layer dimensions after printing (layer size 432 μm). Moreover, there were no boundaries between layers; the connection between layers occurred, and porosity and the rough surface were presented. FTIR analyses showed spectrum peaks at 559.36, 628.79, 1022.27, 1562.34, and 1639.49 cm<sup>−1</sup> which was confirmed as hydroxyapatite and amide (indicates the presence of spectrum collagen). The XRD pattern peaks show the crystallinity of HA/collagen composite (41 %) and HA (42 %). The Ca/P ratio of the material composite was 1.77. The ratio was osteoconductive, and this characteristic was the main requirement for bone grafts. From TGA, the weight loss occurred between temperatures of 25 °C and 1000 °C with three stages: water absorption (1.844 %), removal of organic content (2.854 %), and decomposition of inorganic compounds (3.517 %).</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"329 ","pages":"Article 130047"},"PeriodicalIF":4.3,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533480","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}
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