CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhuoqing An,Yuan Gao,Jiajing Chen
The CaO-MgO-Al 2 O 3 -SiO 2 (CMAS) glass-ceramics containing complex nucleation agents including La 2 O 3 and Fe 2 O 3 were prepared by melt process. The effects of these complex nucleation agents on the crystallization and microstructure of CMAS glass-ceramics were investigated through the thermal analysis (DSC), X-ray diffraction (XRD), optical microscopy, scanning electron microscopy (SEM) and Raman spectroscopy. The results indicated that the addition of La 2 O 3 and Fe 2 O 3 decreases viscosity and ion movement resistance. Furthermore, the La 2 O 3 can increase the crystallization peak temperature, while the Fe 2 O 3 has an inverse effect. The crystallization activation energy decreased from 298.87 to 264.26 kJ/mol as the mole ratio of La 2 O 3 increased to 2%. Conversely, when the mole ratio of Fe 2 O 3 increased to 2%, the crystallization activation energy increased from 298.87 to 347.21 kJ/mol. However, the addition of La 2 O 3 and Fe 2 O 3 decreased the Avrami parameter and promoted the surface crystallization within the CMAS glass system, as confirmed by the microstructure analysis. The crystal show branch-like crystal morphology when La 2 O 3 adding, whereas Fe 2 O 3 addition led to a compact, seaweed-like morphology with a fractal structure. With decreasing La 2 O 3 and increasing Fe 2 O 3 , the width of the dendritic branches increased. The major crystal phases detected on the surface were augite and diopside phase. Fe is predominantly present in the augite phase and La is primarily incorporated as a solid solution within the crystal phase.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2020
·Vol. 33
·期 5
·540-546
·
IF 1.067
Hong Jian,Zhou De-xia,Hao Hong-xing,Zhao Min,Bian Hong-tao
Hydrogels show versatile properties and are of great interest in the fields of
bioelectronics and tissue engineering. Understanding the dynamics of the water
molecules trapped in the three-dimensional polymeric networks of the hydrogels
is crucial to elucidate their mechanical and swelling properties at the
molecular level. In this report, the poly(DMAEMA-co-AA) hydrogels were
synthesized and characterized by the macroscopic swelling measurements under
different pH conditions. Furthermore, the microscopic structural dynamics of pH
stimulus-responsive hydrogels were studied using FTIR and ultrafast IR
spectroscopies from the viewpoint of the SCN − anionic solute as the
local vibrational reporter. Ultrafast IR spectroscopic measurements showed the
time constants of the vibrational population decay of SCN − were
increased from 14±1 ps to 20±1 ps when the pH of the hydrogels varied from 2.0
to 12.0. Rotational anisotropy measurements further revealed that the rotation
of SCN − anionic probe was restricted by the three-dimensional network
formed in the hydrogels and the rotation of SCN − anionic probe cannot
decay to zero especially at the pH of 7.0. These results are expected to provide
a molecular-level understanding of the microscopic structure of the cross-linked
polymeric network in the pH stimulus-responsive hydrogels.
研究领域:
生物材料学
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分子动力学
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2021
·Vol. 18
·期 4
·1153-1163
·
IF 1.968
Wenke Liang,Bin Meng,Qingfei Xiao,Xinyu Ping,Qian Zheng,Chen Li,Zhidong Xia
A second phase of Y 2 O 3 -stabilized Bi 2 O 3 (Bi 0.75 Y 0.25 O 1.5 ,YSB) is introduced into Y 2 O 3 -doped CeO 2 (Ce 0.8 Y 0.2 O 1.9 ,YDC) as a sintering additive and the composite ceramics of YDC-xYSB (x = 0, 5, 10, 20, 30, 40 wt%) are prepared through sintering at 1100°C for 6 h in air atmosphere. The YDC-xYSB ceramics are composed of both YDC and YSB with cubic fluorite structure, and no other impurity phases are detected in XRD patterns. The relative density of YDC-xYSB rises firstly for x ≤5 wt%, and then it declines with YSB addition from 5 to 40 wt%. The average grain size of YDC decreases from 270 nm to 85.7 nm with YSB addition from 0 to 40 wt%. The YSB phase segregates at the grain boundaries of YDC based on the TEM analysis result. The ionic conductivity of YDC-xYSB (x ≥5 wt%) is lower than that of YDC in the test temperature of 200°C–500°C, while it gradually exceeds that of YDC in 500°C–750°C. At 750°C, the conductivity of YDC-30%YSB (6.22 × 10 −2 S/cm) is 1.35 times higher than that of YDC (4.6 × 10 −2 S/cm). The YSB addition can improve the ionic conductivity of YDC in 500°C–750°C and decrease its sintering temperature.
研究领域:
材料科学
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能源材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhengfei Xiang,Zhaoting Zeng,Tengfei Deng
In this study, 0.6Y 2 O 3 -0.4YCr 0.5 Mn 0.5 O 3 negative temperature coefficient (NTC) ceramics doped with different ZrO 2 contents were prepared using a two-step sintering method. The effects of Zr 4+ content on the microstructure and electrical properties of 0.6Y 2 O 3 -0.4YCr 0.5 Mn 0.5 O 3 were mainly investigated. For the microstructure, X-ray diffraction (XRD) reveals the presence of two main crystalline phases in the samples: Y 2 O 3 and YCr 0.5 Mn 0.5 O 3 . Scanning electron microscopy (SEM) reveals a clear two-phase appearance, and the porosity tends to decrease with the addition of ZrO 2 . Combined with energy dispersive spectrometer (EDS) to derive the distribution of the elements, Zr 4+ is mainly present in the Y 2 O 3 phase, with a small amount in the YCr 0.5 Mn 0.5 O 3 phase. In addition, the grain sizes of different groups were counted, and the grain size of Y 2 O 3 decreased from 2.73 ± 1.80 μm to 1.65 ± 0.93 μm with the increase of ZrO 2 content. For the electrical properties, the resistance-temperature curves were measured from 298.15 K to 1073.15 K, and all the samples exhibited NTC characteristics. And with the increase of ZrO 2 content, the resistivity increased from 1.91 × 10 7 Ω cm to 1.96 × 10 8 Ω cm, and the B 25/100 value decreased from 3315 K to 1310 K. In addition, the chemical state forms of the elements on the surface of the samples were analysed by X-ray photoelectron spectroscopy (XPS), and the valence states as well as the occupancy of the transition elements Cr and Mn were analysed in detail according to the principle of multiple splitting. Finally, the mechanism of influence on microstructure and electrical properties is explained by combining the theory of grain boundary migration and thermal ceramic conductivity.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Metals
·
2018
·Vol. 8
·期 9
·698
·
IF 1.704
Guobo Yang,Baoqiang Xu,Heli Wan,Fengkang Wang,Bin Yang,Zhijun Wang
The compound CaCl2plays a significant role in the process of direct calciothermic reduction of Ti2O3to prepare porous titanium. In this paper, the effect of CaCl2on reduction products by calciothermic reduction of Ti2O3was investigated. Results show that the distribution of CaCl2in reduction preform influences particle size and morphology differences in reduction products both on the surface and the inside. The CaCl2is transferred to the surface of the Ti2O3preform due to its volatilization before and throughout reduction. The content of CaCl2in the surface zone of Ti2O3preform is significantly higher than that in the interior during the reduction process, contributing to the formation of large Ti particles with a smooth shape on the surface, and small Ti particles with inherited morphology of Ti2O3inside. More CaCl2causes the aggregation of Ti particles to form large Ti particles which are advantageous as they connect and form a more solid porous titanium structure. The presence of a small amount of CaCl2in the interior also results in the coexistence of small Ti and CaO particles, forming a loose structure with uniform distribution.Keywords:CaCl2;calciothermic reduction;Ti2O3;microstructure;morphology;Ti particles
研究领域:
材料科学
·
冶金工程
✓ 已验证
DOI
高影响因子
Journal of Superconductivity and Novel Magnetism
·
2018
·Vol. 32
·期 5
·1279-1284
·
IF 1.142
Hu Hao,Niu Xiaofei
Magnetoplumbite-type (M-type) barium ferrites doped with different Y–Co doping content Ba 0.95 Y 0.05 Fe 12− x Co x O 19 ( x = 0, 0.1, 0.2, 0.3, 0.4, and 0.5) were successfully prepared by ceramic process and investigated in this paper for the first time. X-ray diffraction were used to analyze the phase of the prepared sample. The scanning electron microscopy (SEM) was used to measure the morphology, and magnetic properties were measured by vibrating sample magnetometer (VSM). The results of XRD show that the single phase of M-type barium ferrites was obtained with the increase of Co content ( x ), but α -Fe 2 O 3 occurred when x exceeds 0.3. The SEM results exhibit the uniform plane hexagonal structures of M-type ferrites with all range of Co doping content. VSM results display that magnetization ( M s ) and coercivity ( H c ) show the same tendency that their values first increase and then decrease with the increase of Co content.
研究领域:
材料科学
·
磁性材料
·
无机功能材料
✓ 已验证
DOI
高影响因子
Foods
·
2025
·Vol. 14
·期 4
·643
·
IF 5.1
Kumayl Hassan Akhtar,Ziwu Gao,Zeyu Zhang,Xiangxiang Sun,Yumei Yu,Jiale Ma,Dequan Zhang,Zhenyu Wang
Preheating and reheating play key roles in enhancing the nutritional and sensory qualities of stir-fried chicken. Thus, this study investigated the effect of preheating (D1) and reheating (D30) after 30 days of storage on the protein profile, lipid oxidation, flavor, texture, color, sensory properties, protein digestibility, and microstructure of household stir-fried chicken. Four doneness levels of preheating (medium rare (T1 = 62 °C), medium (T2 = 65 °C), medium well (T3 = 68 °C), and well done (T4 = 71 °C) and reheating (72 °C) were selected. Results revealed that preheating and reheating enhanced protein and lipid oxidation, while the unfolding of α-helix improved quality and digestibility. GC-MS identified 59 volatile compounds, including β-phellandrene and 1-octen-3-ol in preheating and anethole and benzaldehyde in reheating. Texture analysis showed decreased hardness, chewiness, and gumminess at T3. Lightness (L*) and redness (a*) were largely unaffected, except for the well done (D1T4, D30T4) doneness level, although yellowness (b*) increased with the increasing doneness levels. Sensory evaluation highlighted improved appearance, tenderness, and overall acceptability, particularly for D30T3. Digestibility enhanced with reheating, reaching up to 80% intestinal digestibility at D30T3. Microstructural analysis unveiled structural deformation, which was most pronounced at T4. Preheating followed by reheating enhanced meat quality attributes, with D30T3 emerging as the optimal doneness level for the industrial production of stir-fried chicken.
研究领域:
食品科学
·
营养学
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2013
·
IF 1.789
Lin Gan,Zhi-Yong Mao,Yi-Fei Wang,Fang-Fang Xu,Ying-Chun Zhu,Qing Huang,Xue-Jian Liu
Cerium-doped Ca–α-SiAlON phosphors with Ca n −1.5 x Si 12− m − n Al m + n O n N 16− n :Ce x ( m =2 n , 0.8≤ m ≤2.4, and 0.02≤ x ≤0.40) nominal compositions have been synthesized by gas pressure sintering (GPS). The photoluminescence (PL) properties were studied in relation to phase composition, particle morphology , and microstructure. Continuous addition of Ce rare-earth (RE) could enhance the emission intensity of phosphors, which was partially attributed to the formation of increased amount of planar defects where dense doping of Ce ions is achieved. Such enhancement could hold up to x =0.32, above which the emission intensity fell slightly due to the formation of more secondary phases and a surface glassy phase rather than concentration quenching. Finally, possible ways to improve the luminescence properties of Ce-doped α-SiAlON phosphors were discussed through tailoring the composition and microstructure.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2014
·
IF 3.377
Qiwei Yang,Huabin Xing,Zongbi Bao,Baogen Su,Zhiguo Zhang,Yiwen Yang,Sheng Dai,Qilong Ren
The basicity of ionic liquids (ILs) underlies many important IL-based processes including the dissolution and conversion of cellulose, the capture of CO2, and metal catalysis. In this work, we have disclosed the nature of the basicity of ILs, i.e., the difference between the basicity of IL and the basicity of the molecular solvent and inorganic salt, through a quantitative electrostatic and electronic analysis of the molecular surface for the first time. The results reveal one of the distinctive properties of ILs (enhanced basicity over molecular solvents and inorganic salts with the same basic site) stemming from their special electrostatic environment and microstructure. The enhancement is significant, from either the electrostatic aspect or the covalent aspect of basicity. The peculiar electrostatic environment of ILs leads to stronger basicity than similar molecular solvents, and the relatively freer microstructure of ILs contributes to the enhancement of basicity over their inorganic analogues. These results are highly instructive for better understanding the unique value of ILs and designing novel ILs to improve the efficiency of basicity-related processes.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Miao Zhou,Yun Liu,Xiaolei Li,Tianyi Sui,Dong Su,Huiming Ji
Silicon nitride (Si 3 N 4 ) ceramics were prepared by gas-pressure sintering using Y 2 O 3 –MgSiN 2 as a sintering additive. The densification behavior, phase transition, and microstructure evolution were investigated in detail, and the relevance between the microstructure and the performance (including thermal conductivity and mechanical properties) was further discussed. A significant change from a bimodal to a homogeneous microstructure and a decreased grain size occurred with increasing Y 2 O 3 –MgSiN 2 content. When the small quantity of preformed β-Si 3 N 4 nuclei grew preferentially and rapidly in a short time, an obvious bimodal microstructure was obtained in the sample with 4 mol% and 6 mol% Y 2 O 3 –MgSiN 2 . When more β-Si 3 N 4 nuclei grew at a relatively rapid rate, the sample with 8 mol% Y 2 O 3 –MgSiN 2 showed a microstructure consisting of numerous abnormally grown β-Si 3 N 4 grains and small grains. When more β-Si 3 N 4 nuclei grew simultaneously and slowly, there was a homogeneous microstructure and smaller grains in the sample containing 10 mol% Y 2 O 3 –MgSiN 2 . Benefitting from the completely dense, significant bimodal microstructure, low grain boundary phase, and excellent Si 3 N 4 –Si 3 N 4 contiguity, the sample containing 6 mol% Y 2 O 3 –MgSiN 2 exhibited great comprehensive performance, with a maximum thermal conductivity and fracture toughness of 84.1 W/(m⋅K) and 8.97 MPa m 1/2 , as well as a flexural strength of 880.2 MPa.
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
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2025
·
IF 4.6
Zhongyou Que,Xingyu Li,Lin Zhang,En Mei,Chenguang Guo,Haishen Sun,Junming Liu,Mingli Qin,Gang Chen,Xuanhui Qu
The in-situ synthesis of finely dispersed second phases with high melting points and thermal stability is an effective strategy to address the high cost, inadequate high-temperature performance, and reduced thermal conductivity of tungsten‑rhenium (W Re) alloys. In this study, we employed a novel nitridation-denitridation (NDN) process to synthesize W-10Re-HfN nano powder, in-situ synthesizing nano HfN particles to strengthen and toughen the W Re alloy. Compared to W 10Re, the hardness of W-10Re-2HfN increased significantly from 604 HV to 977 HV, the compressive strength was improved from 1366 MPa to 2181 MPa, and fracture strain increased from 3.6 % to 32 %. Statistical results indicate that HfN particles within the grains or with sizes below ∼36 nm exhibit completely coherent interfaces with the W Re matrix. By combining in-situ synthesis of nitrides with a two-step sintering process, we successfully retained 63 % of HfN particles within the grains and controlled the average particle size of HfN particles at the grain boundaries to be 36 nm, thereby enhancing grain boundary strengthening and coherent interface strengthening. This study innovatively incorporates finely dispersed and highly stable nitrides into W Re alloys through in-situ doping, offering a novel strategy for reinforcing refractory metals.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Ruxia Liu,Wei Zhao,Ye Tian,Jian Zhang,Guoqiang Luo,Qiang Shen
TaC enhancement particles and Re alloy were used to improve the strength and ductility of the tungsten alloy. The synergetic effect of TaC addition and Re alloying on relative density, microstructure, and mechanical properties of tungsten alloy were investigated. The results indicated that a W-based composite with 2.5 wt% TaC addition and 25 wt% Re alloying exhibited yield stress of 1.23 GPa, the ultimate compressive stress of 2.86 GPa, bending strength of 1.30 GPa and strain capacity of 42 %, which was increased by 114 %, 140 %, 226 %, and 133 % than those of pure W. Further analysis revealed that the grain boundary purification, grain refinement, and kinematic strain gradient contribution because of the addition of TaC, lattice distortion, and the generation of dislocations because of the addition of Re alloying are the main strengthening mechanisms in W–TaC-Re composite.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）