Materialia最新文献_第3页

Tensile properties and work hardening in Al0.3CoCrFeNi: The role of L12 precipitates and grain size Al0.3CoCrFeNi 的拉伸性能和加工硬化：L12析出物和晶粒大小的作用

IF 3

Materialia Pub Date : 2024-10-02 DOI: 10.1016/j.mtla.2024.102250

引用次数: 0

The cruciality of particle size and shape on fracture mechanism of aluminum matrix composites 粒度和粒形对铝基复合材料断裂机制的关键作用

IF 3

Materialia Pub Date : 2024-09-30 DOI: 10.1016/j.mtla.2024.102252

引用次数: 0

Severe plastic deformation of Mn-Al permanent magnets 锰铝永磁体的严重塑性变形

IF 3

Materialia Pub Date : 2024-09-29 DOI: 10.1016/j.mtla.2024.102251

引用次数: 0

Bi-functional hydrogen tungsten bronze/carbon composite catalysts towards biomass conversion and solar water purification 用于生物质转化和太阳能水净化的双功能氢钨青铜/碳复合催化剂

IF 3

Materialia Pub Date : 2024-09-27 DOI: 10.1016/j.mtla.2024.102249

{"title":"Bi-functional hydrogen tungsten bronze/carbon composite catalysts towards biomass conversion and solar water purification","authors":"","doi":"10.1016/j.mtla.2024.102249","DOIUrl":"10.1016/j.mtla.2024.102249","url":null,"abstract":"<div><div>We presented a novel bi-functional catalyst composed of H<sub>x</sub>WO<sub>3</sub> and carbon composites, which exhibits excellent catalytic activity in biomass conversion and can effectively purify water via a wide range of wavelengths in the light spectrum. The H<sub>x</sub>WO<sub>3</sub>/carbon composites were effectively produced from commercially available monoclinic tungsten trioxide (WO<sub>3</sub>) and polypropylene (PP) powders to a single-step mechanochemical reaction employing high-energy ball milling. We systemically investigated how different synthesis parameters, such as rotation speed, processing duration, and ball diameter, affect the mechanochemically-induced phase transformation to either tetragonal or cubic H<sub>x</sub>WO<sub>3</sub> during planetary ball milling. The crystal phase of H<sub>x</sub>WO<sub>3</sub> was controllable by altering the total impact energy in the ball milling. In addition, real-time monitoring of the pressure increment inside the pot and evaluation of the evolved gas revealed the degassing behavior through the oxidative degradation of PP assisted by WO<sub>3</sub>. The CV and Rietveld analysis proved that H<sub>x</sub>WO<sub>3</sub> exhibited significant enhancement by two orders of magnitude in the rate of <em>H</em><sup>+</sup> diffusion compared to monoclinic WO<sub>3</sub>. This enhancement would be attributed to the expansion of a mechanically-formed tunnel along the a-axis, which facilitates the migration of <em>H</em><sup>+</sup> ions. The H<sub>x</sub>WO<sub>3</sub>/carbon composites performed approximately 12-fold higher efficiency in generating soluble solids (glucose and furfural derivatives) compared to untreated WO<sub>3</sub> through the catalytic hydrolysis of cellulose, owing to the enhanced Brønsted acidity. Moreover, the composite particles showed broad light absorption in the UV–Vis–NIR range and demonstrated a considerable enhancement of over three orders of magnitude in the photocatalytic degradation of methyl orange pollutants when exposed to NIR and visible light.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142358020","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}

引用次数: 0

Thin microporous polydimethylsiloxane membrane prepared by phase separation and its applications for cell culture 通过相分离制备的微孔聚二甲基硅氧烷薄膜及其在细胞培养中的应用

IF 3

Materialia Pub Date : 2024-09-27 DOI: 10.1016/j.mtla.2024.102247

{"title":"Thin microporous polydimethylsiloxane membrane prepared by phase separation and its applications for cell culture","authors":"","doi":"10.1016/j.mtla.2024.102247","DOIUrl":"10.1016/j.mtla.2024.102247","url":null,"abstract":"<div><div>Animal experiments are often required for biological studies. However, in vitro cell culture models, such as cell-culture inserts and microphysiological systems, can provide a suitable alternative, making them essential tools in cell biology research, including the simulation of an organ environments closely related to the human body. Cell-culture inserts with porous membranes assist in recreating in vivo cell culture environments to study and process cell-culture assays. However, conventional cell culture membranes typically made of polyethylene terephthalate or polycarbonate cannot accommodate cell types that require deformable substrates. As such, this paper introduced a novel approach using spin-casting-assisted polymer-blend phase separation to create thin, flexible, and highly porous membranes for cell culture applications. Polydimethylsiloxane (PDMS) was selected as the material for the porous membrane, and polystyrene (PS) was used as a counter pair to induce phase separation with PDMS. PDMS facilitated the necessary reversible deformations during cell culture owing to its low elastic modulus. The thickness of the membrane and connectivity of the phase-separated PS domains can be adjusted, facilitating the fine-tuning of the pore size and density to improve the membrane performance. Therefore, this study successfully fabricated thin microporous PDMS membranes with improved performance over standard membranes for cell-culture inserts, namely a higher porosity, flexibility, and softness. The results of this study can enhance cell culture methodologies and contribute to a deeper understanding of cellular processes.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417699","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}

引用次数: 0

Diverse kinetic pathways in shock-compressed phase transitions of a metallic single crystal 金属单晶冲击压缩相变中的多种动力学途径

IF 3

Materialia Pub Date : 2024-09-26 DOI: 10.1016/j.mtla.2024.102245

引用次数: 0

Atomic scale investigation and cytocompatibility of copper and zinc-loaded phosphate-based glasses prepared by coacervation 共凝制备的铜锌负载磷酸盐玻璃的原子尺度研究和细胞相容性

IF 3

Materialia Pub Date : 2024-09-26 DOI: 10.1016/j.mtla.2024.102246

{"title":"Atomic scale investigation and cytocompatibility of copper and zinc-loaded phosphate-based glasses prepared by coacervation","authors":"","doi":"10.1016/j.mtla.2024.102246","DOIUrl":"10.1016/j.mtla.2024.102246","url":null,"abstract":"<div><div>Phosphate-based glasses (PBGs) are bioresorbable materials that find application in the field of controlled drug delivery and tissue engineering. The structural arrangements of the phosphate units in PBGs, along with the knowledge of how therapeutic metallic ions are embedded in the phosphate network are important in understanding the degradation and targeted release properties of these materials. Using a combination of Raman spectroscopy, high-energy X-ray diffraction and <sup>31</sup>P and <sup>23</sup>Na solid-state magic angle spinning nuclear magnetic resonance, the atomic structure of coacervate PBGs in the system P<sub>2</sub>O<sub>5</sub>-CaO-Na<sub>2</sub>O-MO<sub>x</sub> (M = Cu or Zn) with loadings of 2, 10 and 15 mol % of M<sup>2+</sup> have been studied as functions of composition and calcination temperature. After drying at room temperature, the structures of the phosphate network in PBG-Cu and PBG-Zn are quite similar, with that of PBG-Zn exhibiting slightly higher connectivity. Heating at 300 °C causes degradation of the polyphosphate chains, even though Q<sup>2</sup> species remain predominant. X-ray photoelectron spectroscopy demonstrates that Cu in calcined PBGs is present in both oxidation states +1 and +2, with a predominance of the +2 state. Cu and Zn ion release data after 24 h exposure of PBGs in deionized water and cell medium DMEM show that release is proportional to their loadings. Cytotoxicity MTT assays of dissolution products of PBG-Cu/ZnX calcined at 300 °C on human osteosarcoma cells (MG-63) and on human skin cells (HaCaTs) showed good cellular response for all compositions, indicating that PBGs have great potential for both hard and soft tissue regeneration.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417696","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}

引用次数: 0

On tailored microstructure in AA 2024 alloy during in-situ microwave casting 原位微波铸造过程中 AA 2024 合金的定制微观结构

IF 3

Materialia Pub Date : 2024-09-26 DOI: 10.1016/j.mtla.2024.102244

{"title":"On tailored microstructure in AA 2024 alloy during in-situ microwave casting","authors":"","doi":"10.1016/j.mtla.2024.102244","DOIUrl":"10.1016/j.mtla.2024.102244","url":null,"abstract":"<div><div>In the present study, application of microwave energy was explored for tailoring the microstructure in AA 2024 alloy through directional solidification route. Microwave transparent (alumina) and absorbing (graphite) mould materials were utilized to investigate the effect of microwave interaction (electric and magnetic field components) with AA 2024 alloy on microstructure evolution in terms of dendrite size distribution and formation of eutectic phase. Results showed more pronounced eutectic phase gradient was developed using alumina mould. On the other hand, a more uniform distribution of eutectic phase and grain size was observed with graphite mould. The development of the eutectic phase gradient is attributed to the effective microwave interaction with the AA 2024 alloy melt during solidification. This is primarily associated with the formation of an additional flux at the solid-liquid (S/L) interface of the alloy under the effect of magnetic field and an enhancement in diffusion flux due to mass transport caused by electric field component of microwave. Formation of AlCu, Al<sub>2</sub>Cu, and Al<sub>2</sub>CuMg intermetallic phases in both alumina and graphite mould casts was confirmed. Significantly higher hardness was observed at the higher eutectic phase sites within the alumina mould cast, whereas graphite mould casts exhibited better tensile properties.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417701","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}

引用次数: 0

Laser energy-dependent processability of non-equiatomic TiNbMoTaW high-entropy alloy through in-situ alloying of elemental feedstock powders by laser powder bed fusion 通过激光粉末床熔融对元素原料粉末进行原位合金化，实现非等原子 TiNbMoTaW 高熵合金的激光能量加工性

IF 3

Materialia Pub Date : 2024-09-26 DOI: 10.1016/j.mtla.2024.102241

{"title":"Laser energy-dependent processability of non-equiatomic TiNbMoTaW high-entropy alloy through in-situ alloying of elemental feedstock powders by laser powder bed fusion","authors":"","doi":"10.1016/j.mtla.2024.102241","DOIUrl":"10.1016/j.mtla.2024.102241","url":null,"abstract":"<div><div>Pre-alloyed powder, which is primarily used in laser powder bed fusion (LPBF), has the disadvantages of requiring time and high manufacturing costs. To overcome these limitations, in-situ alloying, which mixes pure elemental powders and alloys them in real-time during the LPBF process, has attracted attention. In particular, manufacturing high entropy alloys (HEA) containing high-melting-point refractory elements through in-situ alloying presents considerable challenges. In this study, a non-equiatomic single body-centered cubic (BCC) solid-solution HEA was fabricated via in-situ alloying with Ti, Nb, Mo, Ta, and W powders through the LPBF process. Specifically, by applying a high volumetric energy density (VED), we successfully mitigated the segregation of constituent elements, leading to an enhanced crystallographic texture. Consequently, the reduction in the residual stress and high-angle grain boundary (HAGB) density progressed, contributing to an increased relative density. Thus, this study marks a pioneering endeavor for in-situ alloyed HEA fabrication via LPBF, illustrating the efficacy of in-situ alloying utilizing mixed powders.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417700","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}

引用次数: 0

In-melt electron analysis to accelerate process exploration of ceramics: Electron beam melting of TiB2 熔融电子分析加速陶瓷工艺探索：电子束熔化 TiB2

IF 3

Materialia Pub Date : 2024-09-26 DOI: 10.1016/j.mtla.2024.102243

引用次数: 0