JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Rongrong Si,Honggang Luo,Junwen Pu
Wood-conducting polymer materials have been widely used as supercapacitor electrode; however, it remains challenging to achieve a simple method to improve the homogeneity of the conductive material on wood and to reach high mass loading. Herein, a novel “pore-making, active substance-filling, densification (dissolution, in-situ polymerization of polyaniline (PANI), self-shrinking)” strategy is proposed for the preparation of wood electrodes with a high mass loading (41.4 wt%) and homogeneity. Ingeniously, ZnCl 2 as a dissolving agent and pore-making agent to treat delignified wood can generate more pores on the wood, which is more conducive to the penetration of aniline small molecules, besides, the dissolved fine fibers can be entangled with more PANI, which can improve the loading and homogeneity of PANI. After drying treatment, there will be shrinkage again, playing a certain physical densification effect on the large lumen. The optical electrode was RWP2 showing high electrochemical performance (2328.9 mF/cm 2 , 1 mA/cm 2 ), and stability (5000 cycles, 89.3 %). Moving forward, the RWP2//RWP2 SSC showed an excellent energy density of 164.24 μwh/cm 2 at a power density of 250 μw/cm 2 . Remarkably, the simple and versatile strategy of designing wood-based materials with high mass loading provides new research ideas for realizing multifunctional applications.
研究领域:
材料科学
·
能源技术
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Huifeng Hu,Qihang Wang,Huailing Gao,Pengfei Wang,Hang Ping,Jingjing Xie,Zhengyi Fu,Zhaoyong Zou
Ceramics are usually obtained by powder sintering at a temperature higher than 1000 °C. By contrast, living organisms can use hydrated amorphous precursors to produce biominerals with high inorganic content and excellent mechanical properties under mild conditions. Here, inspired by the biomineralization process, aragonite ceramic composed of densely packed nanocrystals is manufactured by in situ crystallization and densification of amorphous calcium carbonate (ACC) under pressure at low temperature (80 °C). It is demonstrated that the structural water played critical roles in promoting the fusion of nanoparticles, nucleation of aragonite nanocrystals, and further densification. More importantly, strong nacre-like aragonite ceramic is constructed by introducing cellulose films as the organic layers, where a gradient interface is achieved by water-promoted fusion of nanocrystals into cellulose. Notably, the hardness and Young's modulus of the artificial nacre from nanoindentation can reach 3.76 and 63.38 GPa, respectively, which are comparable to natural nacre. The macroscopic mechanical analysis gave a Vickers hardness of 258.26 Kgf mm −2 and Young's modulus of 5.94 GPa. Besides, the flexural strength and fracture toughness can reach 158.0 MPa and 3.35 MPa m 1/2 , respectively. Thus, the study provides a new bioprocessing-inspired strategy for the fabrication of ceramics with excellent mechanical properties at low temperatures.
研究领域:
材料科学
·
生物矿化研究
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xinwen Liu,Bingchu Mei,Guolong Tan
Given the downsizing and high integration of laser diodes in recent decades, Yb: Sr 5 (PO 4 ) 3 F (S-FAP) crystal materials are predicted to be employed as an all-solid laser medium to produce more energy for inertial nuclear fusion. The effects of various sintering conditions on the microstructure evolution and properties of 2 at. % Yb: S-FAP transparent ceramics by hot pressing sintering were systematically investigated in this work, which including sintering temperature , sintering pressure, heating rate, and holding time. When other sintering variables are held constant, the results reveal that a sintering temperature of up to 1050 °C results in visible grain development, substantial optical scattering, and even a significant carburizing impact at 1100 °C. Excessive sintering dwell time will result in grain development, and a high sintering holding time will result in the emergence of intergranular pores, lowering the optical quality of ceramics. The optimal heating rate range for as-synthesized ceramic is found to be 5–15 °C/min. Moreover, the grain development process of Yb: S-FAP transparent ceramics is determined to be grain boundary diffusion, with an activation energy of 239.4 kJ/mol during hot pressing sintering. Meanwhile, the as-prepared sample has excellent mechanical properties such as Vickers hardness of 7.47 ± 0.045 GPa, which are highly competitive when compared to other Yb-doped optical ceramic media such as Y 2 O 3 , YAG, Lu 2 O 3 , and so on. Finally, the transmittance was interpreted based on the microstructures of the as-synthesized ceramic samples and the Rayleigh-Gans-Debye scattering theory.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
Coatings
·
2026
·Vol. 16
·期 2
·219
·
IF 3.4
Renjuan Sun,Yan Wang,Yanhua Guan,Chuanyi Ma,Chuan Wang,Yao Ran
Concrete is widely employed in structural engineering; however, its porous nature renders it vulnerable to chloride ingress and salt freezing cycles, ultimately compromising its durability. To address this, a penetrating primer based on tetraethyl orthosilicate (TEOS) was prepared in an ethanol-water co-solvent system, and a hydrophobic topcoat of isooctyltriethoxysilane (IOTES) was obtained via emulsification. A layered application on concrete surfaces yielded a TEOS–IOTES dual-coating protection system designed to enhance water repellency and thereby improve resistance to chloride penetration and salt freeze–thaw damage. Test results show that the dual coating markedly increased hydrophobicity, giving a water contact angle of 130° and reducing water absorption rate to below 0.01 mm/min0.5. Compared with single-layer treatments, the dual coating significantly lowered the free chloride diffusion coefficient (reached 83.74%). In terms of salt freezing cycle resistance, the dual-coating protection delayed surface scaling and increased the critical number of freeze–thaw cycles required for damage by 40%. Microstructural analyses indicate that the TEOS primer generates nano-SiO2and C-S-H gels, refining pores and densifying the matrix, while the IOTES topcoat forms a durable hydrophobic layer that suppresses moisture and deleterious ion transport. The synergistic “densification–hydrophobization” mechanism substantially enhances concrete durability, offering a cost-effective and efficient surface-protection strategy with promising application potential.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xiaofei Wang,Jinping Li,Cheng Yang,Hui Zhang,Songhe Meng
It is difficult to achieve densification for metastable ceramics at ultra-low temperatures sintering due to insufficient sintering kinetics. Here, one strategy is proposed to enhance ceramic densification based on the principles of grain refinement and interface modification, in conjunction with a cold sintering process (CSP, 190 °C, 1 − 240 min, and 350 MPa) to achieve ceramic fabrication in a solid-liquid coexistence sintering environment. ZrW 2 O 8 @ZrO 2 metastable composites as an example to demonstrate the effect of surfactant on grain tailoring and interfacial structure design during the hydrothermal assembly. The results show that the densities and mechanical strengths of the composite ceramics were significantly improved after the shape tailoring. Furthermore, the shape-tailored strawberry-like nanostructure enables the ZrW 2 O 8 to be split into smaller individual units, which allows the composites to achieve a high-level of zero thermal expansion ( α ‾ = 0.045 × 10 −6 °C −1 [-10 − 300 °C]). Such a methodology can effectively solve ceramic densification in ultra-low temperature sintering and provide a practical path for the fabrication of metastable ceramics.
研究领域:
材料科学
·
无机化学
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DOI
高影响因子
OPTICAL MATERIALS
·
2016
·
IF 2.183
Lin Ge,Jiang Li,Haiyun Qu,Juntao Wang,Jiao Liu,Jiawei Dai,Zhiwei Zhou,Binglong Liu,Huamin Kou,Yun Shi,Zheng Wang,Yubai Pan,Qingsong Gao,Jingkun Guo
The sintering behavior and doping concentration profile of the planar waveguide YAG/Nd:YAG/YAG ceramics by the tape casting and solid-state reaction method were investigated on the basis of densification trajectory, microstructure evolution, and Nd 3+ ions diffusion . The porosity of the green body by tape casting and cold isostatic pressing is about 38.6%. And the green bodies were consolidated from 1100 °C to 1800 °C for 0.5–20 h to study the densification and the doping diffusion behaviors. At the temperature higher than 1500 °C, pure YAG phase is formed, followed by the densification and grain growth process. With the increase of temperature, two sintering stages occur, corresponding to remarkable densification and significant grain growth, respectively. The mechanism controlling densification at 1550 °C is grain boundary diffusion. The diffusion of Nd 3+ ions is more sensitive to temperature than the sintering time, and the minimum temperature required for the obvious diffusion of Nd 3+ ions is higher than 1700 °C. Finally, planar waveguide YAG/1.5 at.%Nd:YAG/YAG transparent ceramics with in-line transmittance of 84.8% at 1064 nm were obtained by vacuum-sintering at 1780 °C for 30 h. The fluorescence lifetime of 4 F 3/2 state of Nd 3+ in the specimen is about 259 μs. The prepared ceramic waveguide was tested in a laser amplifier and the laser pulse was amplificated from 87 mJ to 238 mJ, with the pump energy of 680 mJ.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Yingchun Shan,Cun Wei,Liya Ma,Haoran Guo,Xiaoguang Han,Jiangtao Li,Jiujun Xu
By co-doping 0.15 wt% Y 2 O 3 and 0.60 wt% MgO , AlON ceramics with high transmittance in visible and infrared range (the maximum transmittance of 81.8%@3600 nm, 78.1%@400 nm) were successfully fast fabricated via pressureless sintering at 1880 °C for 2.5 h. The phase assemblage, microstructure and densification process of samples doped (Y 2 O 3 /MgO single- and co-doped) and undoped additives during heating were monitored to explore the densification mechanism. MgO was found to be an exceptional inhibitor for both AlON decomposition and grain growth. By incorporating MgO as one constituent of additives, the content of α-Al 2 O 3 that decomposed from AlON in samples during heating was significantly reduced and Mg 2+ illustrated inhibition to grain boundary migration, resulting in particle aggregation/coarsening were effectively suppressed at ≤ 1600 °C. Based on the obtained microstructure with compacted small particles and negligible particle aggregation/coarsening at early stage of sintering, facilitated by the acceleration of Y 3+ on mass transfer, rapid densification of AlON was achieved.
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Mao Chen,Bingbing Fan,Haoyuan Lei,Zijie Song,Shaojun Zhang,Hailong Wang,Rui Zhang,Hongxia Li,Yongqiang Chen
Large size high density h-BN/ZrO 2 composites (ø = 110 mm, h = 15 mm) were rapidly prepared by spark plasma sintering (SPS) with sintering cycle 20 min. The effects of additives on the mechanical properties , microstructure evolution, and corrosion resistance of the h-BN/ZrO 2 composites were studied. The Al 2 O 3 , MgO , SiO 2 , La 2 O 3 and ZrO 2 rapidly formed heterogeneous eutectic crystals under the action of SPS. The low eutectic compounds significantly promoted the diffusion of h-BN or ZrO 2 , also increased the density. The flexural strength of h-BN/ZrO 2 composites could reach 196.31 MPa, and the apparent porosity was only 0.42 %. The additives are combined with zirconia to form a high viscosity eutectic, whose corrosion resistance to molten steel is obviously better than that of single ZrO 2 . The corrosion depth of h-BN/ZrO 2 composites was only 114 µm after corroded in molten steel at 1550 °C for 80 min. The comprehensive properties of h-BN/ZrO 2 composites were obviously improved by appropriate additives.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2025
·
IF 9.1
Tingyu Bi,Tiantian Yang,Zhaoyang Ju,Chengyu Dong,Ning Li,Lujiang Xu,Wei Chen,Zhen Fang,Chunxiao Gong
Densification facilitates the utilization of lignocellulosic biomass by overcoming its limitations of low density and associated processing costs. In this study, acid- and alkali-assisted pelletization of corn stover was performed to investigate the synergistic effects of chemicals and mechanical compression on the physicochemical properties of the pellets and their enzymatic hydrolysis. Results from confocal Raman microscopy revealed that densification caused significant rupture and collapse of plant cell walls. The combined effects of chemicals, pressure, and heat during pelletization reduce biomass particle size and effectively degrade its components. Pelletization also lowers the water absorption capacity of biomass, enabling enzymatic hydrolysis slurries to stay well-mixed at high solid loadings. Acid-assisted pelletization hydrolyzed hemicelluloses into xylose, oligoglucose, and xylooligosaccharides, whereas alkali-assisted pelletization primarily degraded lignin. Enzymatic hydrolysis of pellets without further pretreatment demonstrated that H 2 SO 4 -treated pellets achieved glucose and xylose yields of 48.2 % and 72.8 %, respectively, while NaOH-treated pellets yielded 76.8 % glucose and 63.8 % xylose. These findings could facilitate the application of acid- and alkali-assisted biomass pelletization in large-scale biorefineries.
研究领域:
生物能源
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生物质转化
·
可再生能源
·
生物炼制
·
生物化学工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 17
·23302-23308
·
IF 5.6
Jingwen Feng,Hao Ju,Hengcheng Wan,Lei Miao
Because of their antibacterial and aesthetic properties, zirconia (ZrO 2 ) ceramics are gradually replacing traditional dental restoration metals and metal ceramic materials. Herein, densified 3 mol% Y 2 O 3 –stabilized tetragonal polycrystalline ZrO 2 (3Y-TZP) ceramics doped with ZnO , termed 3Y-TZP-x:Zn (x denotes the mass percentage of the ZnO functional agent), is rapidly prepared using spark plasma sintering (SPS). Results indicate that dense 3Y ceramics can be rapidly prepared via SPS at 1500 °C for 3 min, with a density of >99 % and the maximum doping content of the ZnO functional agent being 0.3 %. Scanning electron microscopy analysis shows that the 3Y ceramic is dense and the particles are uniform and small. This small particle size can enhance the diffusion of ZnO into bacterial cell membranes . 3Y-TZP-x:Zn (x = 0.1, 0.2, and 0.3) ceramics show certain antibacterial properties , with the antibacterial activity being strongest (74.55 %) at x = 0.3. The ZnO functional agent exerts antibacterial effects through a synergistic effect between (1) the contact adsorption mechanism by which reactive oxygen species are generated to inactivate the bacterial cell and (2) the dissolution mechanism by which the stability of metal cations in cells is destroyed. Therefore, SPS may be considered a promising technique for the preparation of antibacterial ceramics at lower temperatures.
研究领域:
材料科学
·
陶瓷
·
抗菌材料
·
牙科材料
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Lan-Yue Cui,Han-Bing Chen,Bai-Ning Shi,Shuo-Qi Li,Cheng-Bao Liu,Hai-Ming Yu,Yu Wang,Fen Zhang,Wei-Xiang Sun,Rong-Chang Zeng
Biodegradable magnesium (Mg) alloys have received widespread attention as bone fixation implants due to their excellent biocompatibility and mechanical compatibility. However, their rapid corrosion rate in solutions containing Cl − ions and the risk of postoperative bacterial infections limit their application. Herein, a quercetin (Qu) loaded polyelectrolyte complex was fabricated on the micro-arc oxidation coated AZ31 alloy (referred to as the PVP/PEI-ICG/Qu coating) to regulate the degradation of the Mg matrix and avoid bacterial infections. The results displayed that the PVP/PEI-ICG/Qu coated substrate significantly reduced the corrosion current density to (2.86 ± 1.89) × 10 −7 A·cm −2 , which was an order of magnitude lower than that of the AZ31 alloy [(8.86 ± 1.35) × 10 −6 A·cm −2 ], due to the combined physical barriers provided by the PVP/PEI complex, the underlying MAO layer and the self-densification effect. Qu was loaded in a single step and protected by polyelectrolyte network, allowing for its release in response to near-infrared light (NIR) irradiation. Additionally, the antibacterial rate of the PVP/PEI-ICG/Qu coating reached 99.8 % ( S. aureus ) and 99.9 % ( E. coli ), thanks to the synergistic effects of Qu and its photothermal and photodynamic properties stimulated by 808 nm NIR irradiation, with a photothermal conversion efficiency of 45.2 %. Moreover, the coating demonstrated excellent biocompatibility, enhancing cell viability by up to 120.8 %. This antibacterial composite coating with good corrosion resistance and antibacterial activity provides a promising strategy for developing antibacterial Mg-based orthopedic implants.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Fei Liu,Lijin Cheng,Hao Li,Shaojun Liu
The dielectric properties of titanate-based microwave ceramics are usually degraded by oxygen vacancies induced by prolonged sintering at high temperature. In this study, the activation sintering and improvement of dielectric properties for 0.7CaTi 1-x O 3 -0.3NdAlO 3 ceramics could be achieved by slight adjusting the stoichiometric ratio of Ti 4+ ions at B-site (CTNA, x = 0.0000, 0.0025, 0.0050, 0.0075). As x increasing from 0.0000 to 0.0050, the relative densities, maximum densification rate, and maximum densification rate temperature all increase. This is attributed to the generation of oxygen vacancy defects that can facilitate atomic diffusion. When x further increase to 0.0075, even though the number of oxygen vacancies continues to increase, the substitution of Nd 3+ with larger ionic radius (1.27 Å) at B-site, compared to Ti 4+ (0.605 Å), induce significant lattice distortion. Consequently, the relative densities of CTNA ceramics (x = 0.0075) remains comparable to that of CTNA ceramics (x = 0.0050). The substitution of Ti 4+ by smaller Al 3+ (0.535 Å) at B-site in CTNA ceramics (x = 0.0050) result in a reduced lattice constant and unti cell volume, which is conducive to the reduction of intrinsic loss and the improvement of dielectric properties: ε r = 45.92; Q × f = 43,900 GHz, and τ f = 2.88 ppm/°C.
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）