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Elsevier Science
Materials letters

Elsevier Science

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0167-577X

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    Carboxymethyl cellulose-assisted preparation of magnetic metal–organic framework nanocomposites with antifouling for efficient uranium enrichment

    Guo X.Gu T.Wang Q.Wang A....
    1.1-1.4页
    查看更多>>摘要：© 2024 Elsevier B.V.A magnetic metal–organic frameworks nanocomposite (FCMCZA) was prepared by solvothermal and in situ growth method for efficient antifouling and uranium enrichment. A series of characterization tests were carried out by SEM, XRD, XPS, FTIR and N2 adsorption–desorption analyses. The FCMCZA exhibited the distinct core–shell structure with high specific surface areas (793.86 m2/g) and abundant functional groups. The saturated magnetization and algae death rate of FCMCZA reached 33.5 emu/g and 41 %, respectively. The maximum adsorption capacity of FCMCZA was 238.66 mg/g at pH 8.0, calculated from Langmuir model. Importantly, the removal capacity of FCMCZA remained 87.29 mg/g after four cycles. The high removal rate (62.9 %) and uranium uptake (11.7 μg/g) in actual seawater further proved its application potentiality.
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    Improving the adsorption of cloud concrete stone porous aggregate to phase change materials by alkali modification

    Zhang D.Yang C.Liang W.
    1.1-1.5页
    查看更多>>摘要：© 2024In this paper, the pore structure of cloud concrete stone (CCS) was optimized by alkaline hydrothermal treatment to improve its adsorption capacity for phase change materials (PCMs), thus enhancing the heat storage effect of phase change composite aggregates. The results showed that the adsorption rate of CCS modified by alkaline solution for 36 h was 21.49 %, which increased by 30.64 % relative to that without modification. The macroscopic and microscopic morphology showed that the 24-hour modified CCS appeared small cracks in the surface and the internal pores became more numerous. The 48-hour modified CCS appeared exfoliated on the surface and the internal pores and cracks increased. Hydrothermal treatment changes the pore structure of CCS, making it more conducive to the adsorption of PCM.
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    Surface-dominated sodium storage enabled by TiO2 nanosheets with 84 % exposure of (0 0 1) facets for high-performance Na-ion battery anodes

    Li Y.Gao Y.Li X.Zhang J....
    1.1-1.5页
    查看更多>>摘要：© 2024 Elsevier B.V.Anatase titanium dioxide (TiO2) has garnered enormous attention as a promising anode material for sodium-ion batteries (SIBs), owing to its non-toxicity, superior structural stability, and cost-effectiveness. Nevertheless, its intrinsic low electrical conductivity poses a substantial challenge to its practical applications. Here, the ultrathin TiO2 nanosheets were obtained. The TiO2 nanosheets with a thickness of ∼8 nm and exposed 84 % (0 0 1) facet. The exposed (0 0 1) crystal facets and ultrathin nanosheet structure provide abundant active sites for Na-ion adsorption, shortens ion diffusion pathways, enhances reaction kinetics, and significantly boosts the pseudocapacitive effect. This synergistic strategy of exposed (0 0 1) facet with nanosheets structure leads to an exceptional capacity of 177.1 mAh/g at 0.1 A/g, and 59 % capacity retention at 5 A/g. This work will contribute to the understanding of facet-dependent electrochemical behavior anode materials for high-performance SIBs.
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    Ta alloy doped InSbTe ensuring high thermal stability and fast operation speed in phase change memory

    Sun T.Du G.
    1.1-1.4页
    查看更多>>摘要：© 2024 Elsevier B.V.The excellent performance of phase change memory (PCM) in non-volatile and storage density makes it one of the most attractive solutions for storage-class memory and neuromorphic computing, whereas the slow operation and low thermal stability limit its extensive applications. Here Ta-doped In0.43Sb2Te3 has been proposed, which enhances the amorphous stability without sacrificing its operating speed. Ta0.12(In0.43Sb2Te3)0.88 film possess excellent 10-year data retention temperature of 184.5 °C and the PCM based on Ta0.12(In0.43Sb2Te3)0.88 achieved an operating speed of 6 ns. Both experimental results indicate that Ta doping reduces grain size, enhances the ability to maintain face-center cubic phase, and improves phase separation caused by In doping. A long endurance of 1 × 106 has been achieved, which is originating from the small volume change of 1.71 %. Therefore, Ta0.12(In0.43Sb2Te3)0.88 material is a potential candidate for application in PCM.
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    Evading the strength-ductility trade-off dilemma in high-entropy alloy by lamellar structure

    Wang W.Lu Y.Qu L.
    1.1-1.4页
    查看更多>>摘要：© 2024 Elsevier B.V.Constructing lamellar structures in high-entropy alloys (HEAs) is an effective strategy for addressing the inherent trade-off between strength and ductility. However, conventional processing methods often struggle to achieve precise control over the microstructures and mechanical properties of the lamellar structures. Here, we employ laser remelting technology to successfully fabricate a lamellar structure within an HEA. The lamellar HEA shows an excellent yield strength of ∼547 MPa with a large uniform elongation of ∼41 %. Such enhanced strength-plasticity synergy is mainly attributed to the hetero-deformation of lamellar structures.
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    Tannic acid and trivalent iron modified Fe3O4 nanoparticles as a new adsorbent to remove uranium from wastewater

    Yang J.Li W.Liu Q.Zhao G....
    1.1-1.5页
    查看更多>>摘要：© 2024 Elsevier B.V.This study reports the preparation and application of Fe3O4 nanoparticles modified by tannic acid and trivalent iron for U(Ⅵ) removal. The phenolic hydroxyl group on the tannic acid molecule can be complexed with U(Ⅵ), so as to achieve the goal of adsorping uranium from wastewater, and the maximum adsorption capacity of TA-FeIII@Fe3O4 can reach 98.2 mg/g. Through the research on pH, dosage, adsorption kinetics and adsorption thermodynamics indicted that it were excepting as a new green adsorbent for removing U(Ⅵ) from wastewater.
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    Structural and electronic properties of monolayers: Enhancing computational accuracy

    Javed A.Asif M.Ali S.A.Ullah R....
    1.1-1.4页
    查看更多>>摘要：© 2024 Elsevier B.V.Matching theoretical and experimental lattice constants is essential for accurately simulating real-life materials. DFT optimizations often yield lattice constants that deviate from experimental values, especially in 2D materials. For instance, databases like C2DB rely on these theoretical values, which might not always reflect experimental data. Furthermore, PBE-based calculations can misclassify the band gap type while also underestimating its magnitude. A notable example is hexagonal boron nitride, where PBE predicts a direct band gap, although experimentally, it is indirect. This work aims to identify functionals that produce lattice constants and electronic properties more aligned with experimental results for monolayers, thereby enhancing the accuracy of machine learning models in materials discovery.
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    An economically viable hybrid additive manufacturing process for the fabrication of hierarchically controlled porous biodegradable Fe-Mn scaffolds

    Sharma P.Kumar A.
    1.1-1.5页
    查看更多>>摘要：© 2024 Elsevier B.V.The present work aims to develop a novel hybrid additive manufacturing (AM) route for fabricating biodegradable hierarchically controlled porous (HCP) Fe-Mn alloy-based scaffolds. Specifically, a systematic combination of polymer AM and loose powder sintering was used. The morphological, mechanical, magnetic and electrochemical properties of the Fe-30Mn scaffold were evaluated and compared with pure Fe. Proper bonding of particles with some random porosity was observed in the sample. XRD spectrum shows the presence of austenite (γ) and martensite (ε) phases in the sample. The prepared Fe-30Mn samples exhibited porosity = 23.08%, compressive yield stress = 127.28 MPa, modulus of elasticity = 25.9 GPa and corrosion rate = 0.75 mmpy. Moreover, the Fe30Mn sample showed weak magnetic properties, thereby making it MRI-friendly. Better properties of the prepared Fe30Mn sample as compared to pure Fe with close compatibility to the human bone were obtained. Additionally, complex structures of Fe30Mn using the developed methodology were fabricated to establish the efficacy of the process for biodegradable implant application.
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    High energy density supercapacitor based on Ag doped MoO3 nanorods on a flexible carbon cloth

    Sharma S.Chauhan S.S.Chappanda K.N.Rahman M.R....
    1.1-1.5页
    查看更多>>摘要：© 2024 Elsevier B.V.In this study, the plain MoO3 and Ag-doped MoO3 nanorods are anchored on a flexible fibrous carbon cloth using a hydrothermal method, and their performances are thoroughly evaluated by fabricating the supercapacitors using both types of nanorods. The doped substrate shows drastic enhancement in specific capacitance which is nearly four times greater than undoped MoO3 nanorods at a current density of 0.5 mA/cm2. Additionally, the Ag doped MoO3 shows an excellent energy density of 43 µWh/cm2. The superior performance of the doped nanorods is attributed to its pseudocapacitive behaviour, higher conductivity, and improved charge kinetics at the electrode–electrolyte interface, enabling a more efficient and potential supercapacitor-based energy storage system to drive future low power flexible and wearable electronic devices.
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    Integration of Bi2S3 nanoflowers into TiO2 nanorods for enhanced photoelectrochemical water splitting performance

    Li A.Liu L.Han M.Jiao Z....
    1.1-1.4页
    查看更多>>摘要：© 2024 Elsevier B.V.Herein, TiO2/Bi2S3 composite photoanode was prepared by loading Bi2S3 nanomaterials on the surface of TiO2 nanorods to promote the separation and transfer of charge carriers. By controlling the concentration of precursors, the morphology of Bi2S3 was modulated from nanosheets to nanoflowers then to nanorods. Benefited from the advantaged three-dimensional structure, TiO2 decorated with Bi2S3 achieved the elevated charge carrier transport. Moreover, the constructed type II heterojunction between TiO2 and Bi2S3 facilitated the separation of photogenerated electrons and holes. With the synergistic effect of structure modulation and heterojunction construction, TiO2/Bi2S3 composite photoanode obtained the optimal photocurrent density of 0.25 mA/cm2, which is 5 times that of pristine TiO2.
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