CATALYSIS COMMUNICATIONS
·
2020
·
IF 3.612
Jiyuan Li,Zhuxiu Zhang,Mifen Cui,Qing Liu,Zhaoyang Fei,Xian Chen,Jihai Tang,Xu Qiao
The acid-catalyzed Markovnikov addition of isobutene is affected by the concomitant isobutene oligomerization. Herein, a solid acid catalyst consisting of the sulfonated silica modified with crystalline ZrSiO 4 was prepared, and the ZrSiO 4 /SiO 2 -SO 3 H catalyst went beyond conventional acid catalysts in the hydroacetoxylation of isobutene. The structure of the catalyst was well-characterized, and the role of ZrSiO 4 in suppressing the dimerization of isobutene was discussed in terms of both kinetic study and in-situ DRIFT analysis. Moreover, this catalyst also showed general applicability for a broad substrate scope, further highlighting the necessity of ZrSiO 4 in the solid acid catalyst.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jiyuan Guo,Yihang Li,Bingbing Bao,Zishan Zhang,Rong Zhang,Hui Dan,Yi Ding
Developing new matrices capable of simultaneous immobilization of lanthanides and actinides are challenging. Herein, this paper reported the ZrSiO 4 -based borosilicate glass-ceramics with excellent immobilization capabilities of lanthanides and actinides. The phase evolution and microstructure transformation affected by the (Nd, Ce)-co-doping content were investigated systematically. The results indicated that the solubility limits of Nd and Ce in the obtained glass-ceramics decreased with increasing temperature, which were up to 18, 16 and 10 at% at 1400 °C, 1450 °C and 1500 °C, respectively. The formation rate of ZrSiO 4 increased with the increase of the (Nd, Ce)-co-doping content and temperature, which reached the highest value of 96.43 wt% with Nd and Ce content of 10 at% at 1500 °C. The densification of the obtained glass-ceramics also increased with the increase of the content of Nd and Ce. In addition, it was found that the immobilization mechanism of the resulting glass-ceramics was the synergistic immobilization effect of the ceramic crystal and glass network. This work indicated that the ZrSiO 4 -based borosilicate glass-ceramics might be promising matrices for immobilizing high-level radioactive wastes containing lanthanides and actinides.
研究领域:
材料科学
·
核废料管理
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jie Zhang,Kang-Bo Yu,Jia-Min Wu,Chun-Sheng Ye,Wen Zheng,Heng Liu,Shi-Feng Wen,Chun-Ze Yan,Yu-Sheng Shi
SiO 2 -based ceramic cores are widely used in the preparation of gas turbine engine hollow blades due to their excellent chemical stability and easy removal after casting. In this paper, ZrSiO 4 reinforced SiO 2 -based ceramics were fabricated using digital light processing (DLP) technology. The results showed that the addition of ZrSiO 4 reduced the cure depth due to its high UV light absorptivity and refractive index . When the content of ZrSiO 4 increased to 15 wt%, the cristobalite content reached the maximum, and radial shrinkage reached the minimum of 1.4%. ZrSiO 4 grains could hinder the propagation of cracks, enhancing the room-temperature flexural strength . At 1550 °C, fracturing across SiO 2 grains in SiO 2 -based ceramics led to the great improvement of high-temperature flexural strength. When the content of ZrSiO 4 reached 15 wt%, the flexural strength at room temperature and high temperature was 11.5 MPa and 36.7 MPa, respectively. Therefore, the SiO 2 -based ceramics prepared using DLP technology have good room temperature and high temperature properties, and are expected to be used for hollow blade casting.
研究领域:
材料科学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
Silicon
·
2019
·Vol. 12
·期 3
·585-594
·
IF 1.21
Wang Qikun,Wang Yongqing,Chang Qibing,Liu Han,Yang Yulong,Zhang Xiaozhen
To obtain the ultrafine pigment for ink-jet printing, ultrafine spherical Pr-ZrSiO 4 pigment was prepared by sol-gel-microemulsion method (S-G-M). In the emulsion, ZrO 2 and SiO 2 sols are used as water phase, cyclohexane serves as oil phase, Triton X-100 and 1-hexanol are chosen as surfactant and co-surfactant, respectively. The results show that without the introduction of demulsifier, the sol/oil microemulsion system is demulsified automatically due to the transformation of liquid/liquid to solid/liquid interface following the transformation from sol to gel. The obtained Pr-ZrSiO 4 pigment owns uniform spherical particles with the average particle size of about 0.785 μm, which is suitable for the ink-jet printing. The CIE coordination of the pigment is L* = 87.63, a* = −3.82, b* = 65.68, which shows bright lemon yellow. Hence, the ultrafine pigment in this work has the good application prospects.
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 MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 7
·1-11
·
IF 2.8
Feng Jingmin,Zhang Yajuan,Lu Yang,Shan Yiting,Guo Xiang,Zhou Hongqing
In this study, CaO–B 2 O 3 –SiO 2 (CBS) glass–ceramics were prepared and compounded with different contents of ZrSiO 4 . The sintering behavior, phase composition, microstructure, dielectric properties, thermal properties, and mechanical properties of this CBS glass–ceramic composite ZrSiO 4 ceramic system were investigated. The results show that CBS glass–ceramic can be sintered densely at 750 °C. However, the crystallinity is unexpectedly low and the dielectric properties are greatly damaged. Surprisingly, the addition of ZrSiO 4 improved the dielectric constant of the composites and achieved a dielectric adjustable in the range of 6.0–7.8. When the composite was sintered at 830 °C for 15 min with 35% ZrSiO 4 addition, the bulk density of the composite increased to 2.93 g/cm 3 . The dielectric constant measured at a high frequency of 13 GHz was 6.93 and the dielectric loss of 1.66 × 10 –3 . Accordingly, the addition of ZrSiO 4 reduced the thermal expansion coefficient of the composite to 6.1 ppm/°C and increased the flexural strength of the composite to 248 MPa.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Chao Wang,Qikun Wang,Kun Liu,Jianlei Liu,Yongqing Wang,Yulong Yang,Qibing Chang
High-performance submicron ZrSiO 4 powder is prepared by a sol-gel-microemulsion-hydrothermal method (S-G-M-H). In this method, the transformation from sol to gel is constrained in the droplets of the microemulsion and accelerated by the hydrothermal process. The interface change of sol/oil to gel/oil makes the emulsion automatic demulsificate without demulsifiers, which means that the organic solvents can be recycled. The preparation process is low-cost and environmentally friendly. The results show that the synthesized ZrSiO 4 powder owns the optimized median diameter (D50) of 0.67 μm under the optimized preparation condition of hydrothermal treatment at 150 °C for 7 h. The ZrSiO 4 particles are the agglomeration of the primary particles with a size of about 100 nm. As an opacifier , 15 wt% submicron ZrSiO 4 powder added give a whiteness value of 85 to the opaque glaze, which is significantly better than commercial ZrSiO 4 powder with the same amount added. Meanwhile, the obtained submicron powder has excellent sintering activity. After sintered at 1300 °C for 2 h, the ZrSiO 4 pellets has the density of 4.32 g cm −3 and the porosity of 0.31%.
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 SOL-GEL SCIENCE AND TECHNOLOGY
·
2015
·Vol. 75
·期 1
·198-205
·
IF 1.532
Liu H. F.,Dai W. B.,Wang H.,Zeng L. K.,Wang Y. M.
Abstract The color of the CdS
x
Se 1− x
@ZrSiO 4 red ceramic pigment is associated with the condensed CdS
x
Se 1− x
particles, which is incorporated into zirconium silicate microcrystals as a robust inclusion body. The pigments were prepared via the gel co-precipitation method. The as-prepared pigments were characterized by X-ray diffraction, CIE-L*a*b* color measurement, scanning electron microscopy, acoustic particle sizer, dynamic laser scattering particle size analysis and polarized optical microscopy, respectively. The results indicate that the pigments prepared in ethanolamine solution show a more intensive tinting capacity, superior thermal stability and the finer particle size than those prepared in prevailing pure water. The prepared red pigments can be potential applied as a promising ink material for inkjet printing. Graphical Abstract Diagram of acid picking pores on pigment encapsulation
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Feng Jiang,Wen Li,Tao Wang,Junling Yu,Junxiong Zhang,Qian Wu,Quan Zhang,Xiaojun Zhang,Qing Hu,Guo Feng,Jianmin Liu,Yun Yu
Novel pressure field assisted non-hydrolytic sol-gel method is developed for the in-situ synthesis of novel seed-pulp-structured C@ZrSiO 4 pigments. The obtained pigments, which are composed of in-situ carbon derived from leaving organic groups as core and zircon as shell, were characterized via DSC-TG, XRD , FT-IR, Raman, XPS , SEM , TEM, UV–Vis, and automatic colorimeters. It was found that the pressure field promotes the non-hydrolytic sol-gel heterogeneous polycondensation reaction and the direct transformation of reaction groups into in-situ spherical carbon. Meanwhile, the in-situ spherical carbon was enclosed by heterogeneous condensation bonds wrap and formed a dense structure. The as-prepared pigments exhibited excellent color rendering performance ( L* = 21.07, a* = 0.48, b* = 0.75) and thermal stability.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Wenhao Du,Fanhao Zeng,Yafang Gao,Ziwei Wang,Meiyan Chen,Zhi Li
Increasing the high-temperature anti-oxidation time of Carbon/carbon(C/C) composites faces significant challenges for conventional coatings. Herein, a unique bi-layer coating of HfC-TaC-B 4 C-SiC(HTBS)/ZrSiO 4 -glass(ZA) was proposed and prepared through slurry sintering method, and their oxidation behavior and mechanism were investigated. The results show that after oxidation at 1673 K in air for 750.5 h, the mass loss of the coated C/C was only 3.48% with about 720 h of weight gain oxidation, indicating that the anti-oxidation time has increased by two or three times compared to traditional coatings. The improved oxygen resistance performance was mainly attributed to the hinder layer of Si/Hf-Ta-Si-O during oxidation, which grew with the simultaneous carbothermal reduction reaction of SiO near matrix and oxidation reaction of HTBS. This is beneficial to lowering the thermal mismatch of coating system, reducing the connected thermal stress cracks as oxygen permeation channels. Our findings provide a new insight on improving the long-time thermal protection performance of C/C composites.
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
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Huidong Tang,Qing Hu,Feng Jiang,Weihui Jiang,Jianmin Liu,Ting Chen,Guo Feng,Tao Wang,Wei Luo
The zircon-based encapsulation carbon black (C@ZrSiO 4 ) inorganic pigments with controllable size were successfully prepared by non-aqueous sol-gel method with the assistance of soft mechano-chemistry (SMC) activation precursors. The XRD and FT-IR results showed that the SMC activation enhanced the reactivity of precursors and facilitated the formation of ZrSiO 4 phase with the calcination temperature at 900–1050 °C, indicating the successfully synthesis of pure ZrSiO 4 phase. The average size of C@ZrSiO 4 inorganic pigments significantly declined from 45.20 to 4.50 μm with the increase of SMC activation time of precursors, however, the L* values of pigments increased from 24.11 to 46.35. It was mainly because of the decreased amounts of protected carbon in ZrSiO 4 matrix and the enhanced light reflectance, which lead to the slight color change from deep black to gray black tone. The colored glaze samples presented a black hue after applied in the ceramic glaze at 1200 °C. Moreover, the black hue intensity of glazed samples was higher than that of the corresponding C@ZrSiO 4 inorganic pigments, indicating the prepared pigments have excellent tinctorial strength and hiding power. These results ensure that the obtained C@ZrSiO 4 inorganic pigments possess the outstanding chromatic performance, excellent high-temperature stability, high chemical stability and suitable particle size, and exhibit great potential in the application of the industrial ceramic decoration.
研究领域:
材料科学
·
无机化学
✓ 已验证
DOI
高影响因子
IEEE TRANSACTIONS ON MAGNETICS
·
2019
·Vol. 55
·期 12
·1-7
·
IF 1.651
Wentao Hu,Xi’an Fan,Zigui Luo,Fan Luo,Guangqiang Li,Yawei Li,Jian Wang
Fe/ZrSiO4 composite compacts with high thermal stability and excellent soft magnetic performance were prepared successfully by mechanical milling and spark plasma sintering. The effect of ZrSiO4 content on microstructure and magnetic properties of the Fe/ZrSiO4 composite compacts was investigated in detail. ZrSiO4 could be coated uniformly on the surface of Fe particles. With the increasing ZrSiO4 content, the core losses are effectively reduced, but the effective permeability and the saturation magnetic magnetization gradually decrease, while the coercivity has shown the opposite trend accordingly. The composite compact with 7.5 wt% ZrSiO4 has shown the superior structure and soft magnetic properties such as high saturation magnetic magnetization (202.20 emu/g), stable effective magnetic permeability (29.39), and lower core loss (4.53 W . kg-1 at 5 kHz). The results indicated that the Fe/ZrSiO4 composite compacts had potential application prospects in electromagnetic conversion equipment at medium and high frequencies.
研究领域:
材料科学
·
磁性材料
·
粉末冶金
·
复合材料
·
功能材料
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2020
·
IF 6.289
Feng Xu,Shizhen Zhu,Zhuang Ma,Yanbo Liu,Hezhang Li,Jingdan Hu
The using performance of carbon fabric reinforced phenolic composites in the aerospace industry is determined by the fibre/matrix interfaces performance and ablation resistance. To enhance these properties, a functionalized ZrSiO 4 sol was prepared and sprayed onto carbon fabric, and then the coated fabric was impregnated with resin to fabricate the composite. The ablation resistance and interlaminar shear strength of the composite were investigated. Results showed that the functionalized ZrSiO 4 sol had positive effect on composite modification. Due to the improved interfacial adhesion between the carbon fabric and resin, the shear strength of the functionalized ZrSiO 4 sol modified composite increased by 11% compared to the unmodified composite. Furthermore, the mass ablation ratio of the functionalized ZrSiO 4 sol modified composite was 30% lower than that of the unmodified composite. The surface ceramic layer with a main phase composition of ZrO 2 provided an oxygen insulating effect and protected the inner material from serious oxidative ablation. These results confirm that the interlaminar shear strength and ablation resistance of the composite were both significantly enhanced, making this composite be suitable for more severe ablation environments.
研究领域:
航空航天工程
·
材料科学
·
复合材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）