JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Liang Zhou,Jianbao Hu,Yunhui Zhang,Min Tan,Chunjing Liao,Han Luo,Yanmei Kan,Xiangyu Zhang,Jinshan Yang,Xiaowu Chen,Shaoming Dong
The phase transition of thermally grown oxide (TGO) has been proven to be an important factor affecting the durability of EBCs. Yb 2 O 3 and Yb 2 SiO 5 can react with silica to form silicate, which can reduce the TGO thickness and extend the lifetime of EBCs. In this paper, the Yb 2 SiO 5 -Yb 2 O 3 -Si-SiC ceramic was prepared by tape casting combined with silicon reactive melt infiltration. The oxidation properties of the ceramic were evaluated at 1200–1400 °C. With the increase in temperature, the content of SiO 2 in the oxide layer decreased and the content of Yb 2 Si 2 O 7 increased. A dense and continuous Yb 2 Si 2 O 7 layer was formed at 1400 °C. Yb 2 Si 2 O 7 is formed at the edge of Yb 2 SiO 5 , then Yb 3+ diffuses outwards, Si 4+ diffuses inwards and gradually forms Yb 2 Si 2 O 7 from the outside to the inside.
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
Heliyon
·
2022
·
IF 3.776
Qi Zhang,Xueqin Zhang,Zhuang Ma,Ling Liu,Yanbo Liu,Wei Zheng
Thermal and environmental barrier coatings (TEBCs), an up-to-date concept, are introduced to protect silicon-based ceramic matrix composites (CMCs) from not only high-temperature water vapor but also alkali salts from volcanic ash and dust suspended in the atmosphere. Both high-temperature steam and CMAS will cause Si-based CMCs to deteriorate rapidly. By executing the corrosion test against high-temperature water vapor, we find that the Y 2 SiO 5 /Si double-layer TEBC can effectively protect SiC f /SiC CMCs from water vapor at 1300 °C for over 205 h. Almost all Y 2 SiO 5 transforms into Y 4.67 (SiO 4 ) 3 O after the corrosion test. It is also found that in the CMAS corrosion test, the reaction zone formed between the CMAS and Y 2 SiO 5 layers prevents the mutual diffusion of elements in the CMAS and Y 2 SiO 5 layers. The apparent activation energy of the reaction between CMAS and Y 2 SiO 5 in the 1200–1300 °C temperature range is calculated to be 713.749 kJ/mol. These findings provide a reference for selecting appropriate materials for TEBCs.
研究领域:
材料科学
·
高温腐蚀
✓ 已验证
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-9
·
IF 14.7
Xiao Kai,Wan Jing,Xie Hui,Zhu Yuxuan,Tian Tian,Zhang Wei,Chen Yingxin,Zhang Jinshu,Zhou Lihui,Dai Sheng,Xu Zihan,Bao Wenzhong,Zhou Peng
Embedded Dynamic RAM (eDRAM) has become a key solution for large-capacity cache in high-performance processors. A heterogeneous two transistor capacitorless eDRAM (2T-eDRAM) that combines silicon and molybdenum disulfide (MoS 2 ) is reported to address the short retention issue in conventional gain cell (GC) eDRAMs meanwhile eliminate the pillar capacitor in one transistor and one capacitor (1T1C) eDRAMs. The MoS 2 write transistor with low OFF current (I OFF ) enables long data retention, while the Si read transistor offers high drive current and logic compatibility. This combination enhances data retention by 1000 times and sense margin by 100 times respectively compared to full Si and MoS 2 counterparts. A three-dimensional (3D) design stacking MoS 2 on Si is demonstrated with back-end-of-line (BEOL) process to double integration density. With 6000 s data retention, 35 μA/μm sense margin, 5 ns access speeds, 3D integration and CMOS logic compatibility, this Si-MoS 2 eDRAM marks a significant advancement in memory technology.
研究领域:
半导体器件
·
存储技术
·
微电子
✓ 已验证
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2019
·Vol. 7
·期 10
·1900023
·
IF 7.125
Liang Chen,Wei Tian,Liangliang Min,Fengren Cao,Liang Li
Designing Si nanowire-based heterostructures provides a promising path to construct self-driven and broadband photodetectors, which are the key components for optoelectronic systems. Herein, the first fabrication of a p-CuIn 0.7 Ga 0.3 Se 2 nanoparticles/n-Si nanowire array core–shell structure through a simple two-stage process—spin coating and selenization treatment—and its integration into a self-driven photodetector are reported. The heterojunction photodetector is sensitive to broad wavelength range from UV light to visible and near-infrared light, with high detectivity of up to 1.6 × 10 13 Jones, large responsivity of 0.33 A W −1 , and an ultrafast response speed of 823/356 µs at zero bias. Additionally, this core–shell nanostructure exhibits good air stability and strong ability to detect weak light sources such as fluorescent lamp and lighter. The superior performance can be attributed to the strong light absorption of both Si and CuIn 0.7 Ga 0.3 Se 2 , the unique vertically standing core–shell structure, and effective photogenerated carriers' separation and transportation at the heterojunction interface.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
Journal of the American Chemical Society
·
2022
·
IF 16.383
Kang Ma,Tiantong Zhang,Ying Qin,Zhixin Hu,Zhixiang Sun,You Han,Dongbing Zhao,Hong-Ying Gao
Desilylative coupling involving C–Si bond cleavage has emerged as one of the most important synthetic strategies for carbon–carbon/heteroatom bond formation in solution chemistry. However, in on-surface chemistry, C–Si bond cleavage remains a synthetic challenge. Here, we report the implementation of C(sp2)–Si bond cleavage and subsequent C–C bond formation on metal surfaces. The combination of scanning tunneling microscopy and density functional theory calculation successfully reveals that the incorporation of the C–Br group on the arylsilanes is critical to the success of this desilylative coupling reaction on metal surfaces. Our study represents a promising approach for the removal of protecting silyl groups in on-surface chemistry.
研究领域:
表面科学
·
材料化学
·
理论化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2024
·
IF 5.9
Kaini Ma,Kai Li,Ping Ning,Jiayu Feng,Jiacheng Bao,Lei Shi,Xiangyu Wang,Xin Sun
This study employed a wet impregnation method to synthesize five types of Cu/HZSM-5 adsorbents with Si/Al ratios of 25, 50, 85, 200, and 300, used for the removal of H 2 S in low-temperature, low-oxygen environments. The impact of different Si/Al ratios on the adsorption oxidative performance of Cu 30 /HZSM-5–85 adsorbents was investigated. According to the performance test results, Cu 30 /HZSM-5–85 exhibited the highest breakthrough capacity, reaching 231.75 mg H 2 S/g sorbent . Cu/HZSM-5 sorbent maintains a strong ability to remove H 2 S even under humid conditions and shows excellent water resistance. XRD , BET, and XPS results revealed that CuO is the primary active species, with Cu 30 /HZSM-5–85 having the largest surface area and highest CuO content, providing more active sites for H 2 S adsorption. H 2 -TPR and O 2 -TPD results confirmed that Cu 30 /HZSM-5–85 sorbent exhibits outstanding redox properties and oxygen storage capacity, contributing to excellent oxygen transferability in the molecular sieve adsorption-oxidation process. With notable characteristics such as a large surface area, high desulfurization efficiency, and water resistance, Cu 30 /HZSM-5–85 sorbents hold significant importance for industrial applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Jiangang Kang,Haihong Zhang,Yuehui He,Liang Wu,Hengdi Ye,Jinchao Wei
The novel Ni-Si intermetallic compounds are fabricated by elemental powder metallurgy. This study explores the synthesis of a series of catalysts (Ni-Si-M, M=Co, Fe, Mn) by alloying to augment the low-temperature efficiency of CO oxidation using Ni-Si intermetallic compounds. It is found the low-temperature catalytic activity of Ni-Si-Co, Ni-Si-Fe, and Ni-Si-Mn catalysts are significantly enhanced compared to the original Ni-Si. The catalytic activity among the catalysts ranks as follows: Ni-Si-Co > Ni-Si-Fe > Ni-Si-Mn > Ni-Si. The apparent activation energy (Ea) for Ni-Si-Co was the lowest at 57.3 kJ/mol, suggesting its efficient catalytic oxidation of CO. Additionally, the addition of Co, Fe and Mn elements actually promotes the generation of Ni 2+ as the CO adsorption site in the original Ni-Si. The addition of Co element also leads to the formation of Co 2+ as the adsorption site of O 2 in the process of CO oxidation reaction. The synergistic adsorption of Ni 2+ and Co 2+ to CO and O 2 promotes the CO oxidation reaction. Additionally, the catalysts demonstrate robust long-term stability in atmospheres containing H 2 O and SO 2 , with CO conversion initially suppressed but subsequently recovering and stabilizing at over 90%. This investigation offers novel insights into enhancing the low-temperature activity and stability of catalysts.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 35
·15892-15900
·
IF 3.591
Shengjie Guan,Fan Wu,Qian Wu,Zhichao He,Jing Jiang,Yudong Huang,Li Liu
A series of new types of modified hydrosilanes were synthesized, using hydrosilanes and nitrogen heterocycles (triethoxysilane, 2-aminopyrimidine, 1,2,4-triazin-3-amine, benzylamine and 2-aminobenzothiazole), by Si–N cross-dehydrocoupling catalyzed by Ru3CO12. The results of the synthesis were then demonstrated by 1H nuclear magnetic resonance and GPC testing. Furthermore, modified silicone resins were obtained by a hydrolytic condensation reaction catalyzed by tetramethylammonium hydroxide and characterized by TGA, DSC and FT-IR. Next, excellent thermal stabilities were determined (best initial decomposition temperature was approximately 400 °C, T95% was 595 °C, the mass residue rate at 800 °C was 87.2%). Carbon fiber reinforced silicone matrix composites were manufactured according to the technical process developed using DSC and rotary viscometer test results, and the mechanical property (ILSS) showed great improvement from 34.8 to 45.8 MPa because of the modification of Si–N cross-dehydrocoupling. After pyrolysis up to 1000 °C, the composites still showed a superior ILSS value (19.6 MPa) and the modified silicone resins had a more regular and rounded microstructure and appeared to have ceramic-like particles of Si3N4. This work indicated that the silicone resin (Si–N) modified by cross-dehydrocoupling had greater competitiveness in the field of resin matrix composites.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Wanli Zhu,Ge Zhang,Jianxun Bao,Congcong Cui,Conghui Guo,Wei Li,Chuanxiang Xu,Wei Zhang
To preserve the structural and interfacial integrity of diamond, diamond/SiC composites were fabricated by Si infiltration under gas flow guidance. The characteristics of these materials are significantly affected by the interfacial reaction between Si and diamond. The interface formation was studied extensively by locally analyzing the microstructure of the interfacial regions via transmission electron microscopy (TEM), field-emission scanning electron microscopy (FE-SEM), Raman spectroscopy, and X-ray diffraction (XRD). The results demonstrated that the extent of reactive erosion of diamond by Si weakened as the gas velocity increased during the infiltration process. Nanocrystalline Si 5 C 3 and β-SiC grains with an orientation relationship were observed at the diamond/SiC interface. Furthermore, by employing gas flow guidance, the diamond/SiC composites exhibited a better specific stiffness, measuring up to 183.3 × 10 6 m 2 s −2 , which represents an exceptional 18 % improvement compared with the control group.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2025
·
IF 6.3
Jinbiao Zhao,Huimin Duan,Xinxin Xu,Shangchao Ji,Hao Yang,Zhichao Huang,Qi Zhong,Dongming Qi
Reactive polyurethane (RPU) films in a solvent-free medium exhibit exceptional stability and mechanical properties due to their highly cross-linked structure. Achieving inherent fire resistance, waterproofing, and high mechanical performance in RPUs is challenging. Here, we prepared an intrinsic flame retardant, waterproof, and flexible RPU using a P/Si synergistic system with hydroxylated ammonium polyphosphate aAPP/Si-RPU via in-situ polyaddition of NCO-double capped prepolymer and polyol components, including polydimethylsiloxane (PDMS) and aAPP. The aAPP was synthesized through cation exchange between diethylene glycol amine (DGA) and ammonium polyphosphate (APP). Compared to pure RPU, aAPP/Si 15% -RPU showed a 60.3 % reduction in peak heat release rate (pk-HRR) and a 14.1 % reduction in total heat release (THR), with the limiting oxygen index (LOI) increasing from 18.2 % to 27.8 %. Mechanical properties and hydrophobicity improved, with tensile strength at 31.9 ± 1.9 MPa, elongation at break at 522.7 ± 20.3 %, and a water contact angle of 127.1°. The balance of properties was due to ordered microphase separation from the organic–inorganic hybrid structure of aAPP and PDMS, where aAPP particles enhanced microstructure and crosslinked interactions, and the Si-O bond in PDMS provided flexibility and water resistance. This study presents a strategy to resolve the conflict between rigidity and toughness, offering design ideas for intrinsic flame retardant polyurethane.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Australian Ceramic Society
·
2024
·
IF 1.8
Lin Jia,Wang Shuai,Yang Yihang,Huang Guimei,Wang Jinhuo
In this study, Zr-modified Si-O-C precursor ceramics were prepared using three-dimensional (3D) printing. Ceramic sintering was completed by printing four precursors containing different zirconium acetylacetone contents. Comparative analysis was conducted on the ceramic yield, size shrinkage, mechanical properties, and microstructure. The results showed that the ceramic yield and size shrinkage of the four samples were increased with the increasing zirconium acetylacetone contents. The sample containing 30 wt% zirconium acetylacetone exhibited good compressive performance, with a compressive strength of 50.2 ± 0.6 MPa. Cracks were observed on the surface of samples containing 40 wt% zirconium acetylacetone, while those containing 10, 20, and 30 wt% zirconium acetylacetone were relatively intact. Therefore, a stable Si-Zr-O-C precursor ceramic with good mechanical properties, which can be used for 3D printing, was obtained.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Lei Jia,Linwen Jiang,Wenli Zheng,Jingwu Wu,Junli Feng
FeCoNiMnSi x (x = 0.1, 0.2, 0.3, 0.4, and 0.5) HEAs were synthesized by utilizing a novel high-energy ball-milling technique. When the Si content reached 0.3, the phase structure will transform from FCC to BCC. In terms of high-temperature oxidation resistance, Si may dramatically minimize the oxidation level of the alloys at high temperatures, hence improving the high-temperature oxidation resistance . The addition of Si to the alloys had slight influence on the corrosion resistance . Additionally, incorporating an appropriate amount of Si may also reduce magnetic loss, promote impedance matching, and improve electromagnetic-wave loss capabilities. FeCoNiMnSi 0.3 exhibits good electromagnetic-wave absorption capability with a minimum reflection loss value of − 48.6 dB at 4.24 GHz and an effective absorption width of 4.81 GHz at 2.03 mm thickness. This study is necessary for the investigation of electromagnetic-wave materials with practical applications at high temperatures.
研究领域:
材料科学
·
电磁学
✓ 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）