Abstract ：

In this paper, high transmittance glass-ceramics containing Zirconium Yttrium Oxide (Zr0.82Y0.18O1.91) nanocrystals were successfully prepared by melt cooling and crystallization heat-treatment method. The effects of Y2O3 concentration on the structure, crystallization performance, transmittance, and indentation fracture toughness of Na2O-Al2O3-B2O3-SiO2-ZrO2 glass and glass-ceramics were explored. The addition of Y2O3 improved the Vickers hardness (4.81 GPa-5.25 GPa) and indentation fracture toughness (0.78 MPam(1/2) to 0.95 MPam(1/2)) of the glasses. Y2O3 successfully facilitated the precipitation of the non-alkaline crystalline phase Zr0.82Y0.18O1.91 at low heat-treatment temperatures. The precipitation of Zr0.82Y0.18O1.91 nanocrystals improves the Vickers hardness (5.17 GPa-5.56 GPa) and indentation fracture toughness (0.90 MPam(1/2) to 1.01 MPam(1/2)) in glass-ceramics, while concurrently preserving a high level of visible light transmittance (similar to 90 %). This demonstrates its potential applications in the field of protective covers for electronic displays.

Keyword ：

Glass-ceramic Zr0.82Y0.18O1.91 Nanocrystal Indentation fracture toughness

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Abstract ：

Background: The separation of tungsten and molybdenum has always been a significant challenge. Metal organic frameworks (MOFs) has potential to solve the problem. In this study, the adsorption and separation performance of UiO-66 for tungsten and molybdenum and adsorption mechanism were investigated. Methods: UiO-66 was synthesized by solvothermal method. The physical and chemical properties of UiO-66 and adsorption mechanism were characterized and analyzed by XRD, SEM-EDS, FT-IR, Zeta-potential, XPS and thermodynamic analysis, the adsorption and separation performance of Mo/W using UiO-66 were evaluated by ICP-OES. Significant findings: UiO-66 with uniform pore size could be obtained under the conditions of crystallization for 24 h at 180 degrees C. This study revealed superior Mo/W separation performance under acidic conditions, where the adsorption capacity for Mo (QMo) of UiO-66 was 219.4 mg center dot g-1 and the highest separation factor (beta Mo/W) was 52.3. It was found that the mechanism involved the effect of pore size, electrostatic attraction and the metal point Zr had stronger affinity for Mo. This material was expected to serve as an eco-friendly and reusable adsorbent for separation of tungsten and molybdenum in resource recovery, aiming for high-quality regeneration of both metals.

Keyword ：

Tungsten Separation UiO-66 Molybdenum Adsorption

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Abstract ：

Halide perovskite presents great competitive advantages in the new generation of stimuli-responsive materials, while the tuning of fluorescence emission is still limited by irritative factors and external conditions. Herein, antisolvent assisted crystallization and in-situ synthesis are innovatively combined to accomplish the fiberized selfassembly of copper-based perovskite quantum dots economically and environmentally, which makes humidity a novel stimulus for luminescence regulation. Under the excitation of medium-wave UV, the original Cs3Cu2I5CsCu2I3@polyacrylonitrile (CCI@PAN) fibers exhibit a main emission peak of 460 nm with a shoulder at 550 nm, and the intensity of shoulder peak is gradually increased with the continuous addition of moisture. Switching from blue to yellow fluorescence is achieved in CCI@PAN fiber membrane by the introduction of water, which is attributed to the ultra-high solubility of CsI in water. Moreover, owing to the spatial limitation of the nanofibers, the unique incomplete reversibility exhibited by the nanofiber membrane during water removal predicts that the nanofiber membrane can be used as a permanent recording material. Overall, this work deeply explores the influence of humidity on the fluorescence and structure of perovskite quantum dots, providing a method to synthesize innovative perovskite nanofiber composites based on emission conversion, which has broad prospects in advanced anti-counterfeiting, biological protection display, information encryption and smart wearable devices.

Keyword ：

Super flexibility Incomplete reversibility Fiberized self-assembly Copper-based perovskites Hydrochromic materials

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Perovskite light-emitting diodes (PeLEDs) have attracted widespread interest owing to their tunable emissions, high color purity and cost effective fabrication processes. It is widely recognized that high quality perovskite nanocrystal (PeNC) films are crucial for obtaining efficient PeLEDs. However, due to the fast crystallization rate of perovskite precursors, it is a great challenge to achieve precise control of the size and dimension of the PeNC film using a single ligand additive. Here, two types of ligands with different effects, phenethylamine bromide (PEABr) and benzoic acid (BZA), are together introduced for fabrication of formamidine lead bromide (FAPbBr(3)) NC films. By systematically investigating the formation process of FAPbBr(3) crystals using dual ligands, the regulation mechanism and the ligand synergistic effect are revealed. Then, highly luminescent and uniform FAPbBr(3) NC films with a well confined three dimensional structure are fabricated through finely tuning the ratio of PEABr and BZA. Efficient electroluminescent (EL) devices are further achieved based on these obtained high quality FAPbBr(3) NC films with the maximum current efficiency of 39.0 cd A(-1) and an external quantum efficiency of 9.5%. Besides, the ligand synergistic effect on improving the device performance is explained and clarified. Moreover, EL devices fabricated using FAPbBr(3) NC films based on dual ligands exhibit a significantly prolonged operation lifetime and better adaptability for large scale displays, showing potential advantages for future LED applications.

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Solar-driven interfacial evaporation stands out as a low-energy, environmentally-friendly desalination approach with substantial potential for clean water recovery and resource harvesting. However, the stability of the system is compromised by an undesirable increase in salt accumulation. Herein, we designed a modular structure to separate functional areas. The whole structure contains an evaporator and a collector: the evaporator mainly takes on the function of evaporation and the collector is mainly used for the crystals collection. Operating under one sun illumination, the system attained a high evaporation rate of 2.34 kg m-2h- 1 and a high solar-water evaporation efficiency of 133.19 %. Owing to the replaceable collector, the evaporation system maintained a consistently high evaporation rate even after 240 h of continuous operation, and up to 97 % of the solute was enriched in the collector. Furthermore, we investigated the impact of natural organic matter (NOM) on both evaporation and crystallization within the system. This study provides a new perspective on the design of solar interfacial evaporation and crystallization systems.

Keyword ：

Evaporator fouling Solar -driven interfacial evaporation isolated salt harvest Spatially Removable salt collector

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This review aims to provide an insight into the imidazolium ionic liquids (ILs) as novel phase change materials (PCMs) for low and medium temperature thermal energy storage, with a focus on their multi-dimensional thermophysical/nucleation features within encapsulation for defect regulation during solid-liquid transition. Imidazolium ILs have been emerging as novel phase transition-based energy storage material due to unique properties of wide liquidous range, rich crystallization behavior, small thermal volumetric expansion and environmental-friendly properties, but suffer from defects of low enthalpy and large supercooling. To meet the challenge acting as PCMs, the work first gave a brief overview on supercooling regulation and enthalpy elevation of imidazolium ILs, and proposed micro-encapsulation with crystallization-promoting porous shell to regulate their defects. Then discussion regarding multi-dimensional thermophysical features of imidazolium ILs were given, including features within micro-confined capsule core (phase transition, melting point, thermal stability, specific heat capacity and thermal conductivity), nano-confined nucleation within the mesoporous shell, and mesoporous interfacial nucleation. Finally, the future applications of imidazolium ILs and microencapsulation in the fields of infrared stealthy, solar thermal utilization, thermal management in extreme environment and green energy-saving building were highlighted. The study provides a timely review of the imidazolium ILs acting as thermal energy storage (TES) materials, and future suggestion like functional ILs with more hydrogen bonds or supercooling utilization for seasonal TES may help concentrate efforts on solving the key issues in urgent need.

Keyword ：

Supercooling Phase chagne materials Phase transition behavious Thermal energy storage Imidasolium ionic liquids

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Fluidity of Ti-4Mo-3V-4Cr-0.5Fe-3.5Al-xO alloy with different contents of oxygen addition has been studied. The fluidity of alloy displays obviously improvement with the enhancement of oxygen contents up to 0.6 wt%.The influence of oxygen on the microstructure and thermophysical parameters is analyzed and discussed. With increase of the oxygen content, the changes of superheat, solidification interval width, viscosity, and density exhibit negative effects on the fluidity of alloy melt. However, the refined grains, enhanced crystallization latent heat, and declined thermal conductivity play positive effects on the evolution of fluidity for alloy melt. And positive effects dominate the evolution of fluidity. Therefore, the addition of oxygen can improve the fluidity of Ti-4Mo-3V-4Cr-0.5Fe-3.5Al.

Keyword ：

Oxygen content Fluidity Metals and alloys Microstructure Thermophysical parameters

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Aluminoborate glass, recognized for its remarkable crack resistance, presents significant potential as a cover material for portable electronic devices. Nevertheless, its relatively low hardness has been a limiting factor. This study synthesized a series of 11 Li2O-30 Al2O3-(55-x) B2O3-2 TiO2-2 P2O5-xCaO (wt%), with x varying from 0 to 10, employing the melt-cast method. The resultant glass-ceramics were produced via heat treatment at 590 degrees C for 2 h, followed by a systematic examination of their structural and mechanical properties. The investigation demonstrated that an increase in CaO content diminishes crystallization and induces a morphological transition in the crystalline phases from granular and short rod-like structures to lath-like formations, which subsequently impacts the coordination environment of Al and B atoms. With a CaO content of 2 %, the GC2 sample precipitated Li(Al7B4O17) and Li2AlB5O10 phases, achieving a compressive strength (CR) value of 15.0 N, a hardness of 7.51 GPa, and a fracture toughness of 1.50 MPa m0.5. This glass-ceramic exhibited optimal scratch resistance and visible light transmittance exceeding 85 %, underscoring its considerable promise for application as smartphone cover glass due to its impressive overall damage resistance.

Keyword ：

Transmittance Calcium oxide Glass-ceramics Aluminoborate glass Damage resistance

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Li2O-Al2O3-SiO2 (LAS) glass-ceramics are commercially significant due to their unique microstructure and exceptional properties, including near-zero thermal expansion coefficient, making them suitable for a wide range of applications. However, the content of SiO2 and Al2O3 in the composition of LAS glass is very high, which leads to high viscosity and very difficult melting of this type of glasses. In order to reduce the melting temperature of the glass, use of relatively high Na2O in the basic glass composition allows high-quality glass to melt. Employing a simplified heat-treatment method, LAS glass-ceramics are prepared with Australian spodumene as the primary material. By exploring the effect of crystallization temperature on the structures and properties of the resulting LAS glass-ceramics, samples with excellent comprehensive properties are achieved. The prepared glass-ceramics are thoroughly characterized using DSC, XRD, FTIR, SEM, and TEM, along with assessments of their viscosity, thermal, optical, and mechanical properties. Relatively more Na2O is introduced into the glass compositions, which can lower the melting temperature of the glass to below 1600 degrees C. The basic glass is annealed at 700 degrees C for 2 h, nucleation phenomenon Nucleation phenomenon can be generated in the LAS glasses. When the microcrystalline temperature of glasses increases from 835 degrees C to 910 degrees C, the main crystalline phase of glass-ceramics changes from beta-quartz solid solution to beta-spodumene solid solution. The change in the main crystal phase has significantly affected the properties of glass-ceramics. When the crystallization temperature is below 860 degrees C, the glass-ceramics exhibit a low negative expansion coefficient (<-0.5 x 10(-6) K-1), high visible light transmittance (>85 %), and excellent average flexural strength (173.3 MPa).

Keyword ：

Simplified heat-treatment LAS glass-ceramics Crystallization temperature Low thermal expansion

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The recovery of spent hydrogenation catalysts occupies advantages in both alleviating environmental burden and resource shortage. Whereas, the development of conventional hydrometallurgical recovery of molybdenum (Mo) and nickel (Ni) from spent MoNi/Al2O3 catalysts has been limited by the numerous processes and the accompanying generation of waste liquids and residues. Herein, A new recycling route for the preparation of spent hydrogenation catalysts with low thermal expansion coefficients (CTE) was proposed, which has the advantages of short process, green environment and high value utilization. The Li2O-Al2O3-SiO2-B2O3 (LASB) parent glass containing Mo and Ni were obtained by melting with different contents of the spent catalysts. The thermal expansion coefficient of the glass was minimized to 6.08 x 10-6/degrees C at an addition of 25 wt% of the spent catalysts. Moreover, according to the crystallization peak in DTA curve, glass-ceramics were prepared by onestep crystallization heat treatment at different crystallization temperatures. The main crystalline phase of the glass-ceramic precipitated by heating at 685 degrees C is beta-quartz (Li2Al2Si3O10), which gives the glass-ceramics the lowest coefficient of thermal expansion (0.96 x 10-6/degrees C) of glass-ceramic as well as the maximum density (2.45 g/cm3) and Vickers hardness (705.8 Hv). Furthermore, the activation energy (354.65 +/- 17.42) kJ/mol) and Avrami index (5.39) associated with crystallization were extracted from the fitting of different theoretical model, indicating the three-dimensional crystallization of the LASB glass-ceramics. This technology provides a waste-tomaterial strategy for hazardous waste and a clean production route for the preparation of the functional glassceramics.

Keyword ：

Low thermal expansion coefficient Glass -ceramics Spent hydrogenation catalysts Li2O-Al2O3-SiO2-B2O3

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