KEY ENGINEERING MATERIALS
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2018
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IF 0
Rui Wang,Yu Kun Sun,Bao Jia Qi Jiang,Hui Yang,Xing Zhong Guo
Macroporous Ca12Al14O33 (C12A7) mayenite monoliths have been successfully prepared via a sol-gel process in the presence of propylene oxide (PO) and poly (ethyleneoxide) (PEO). Gelation of CaO-Al2O3 binary system with nitrates salts as additional precursors is accelerated by PO as an acid scavenger, while PEO works as a phase separation inducer to mediate the phase separation of the system. Appropriate PO and PEO amounts allow the formation of monolithic xerogel with interconnected macropores and co-continuous skeletons. The resultant dried gels are amorphous and the single crystalline phase Ca12Al14O33 mayenite forms after heat-treatment at 1100 °C in air, while the macrostructure is preserved with a porosity as high as 78% and smoother and denser skeletons.
研究领域:
材料科学
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无机化学
✓ 已验证
产品关联
DOI
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Yaling Zhang,Lingcong Fan,Xuefeng Wang,Jiansheng Xie,Ying Shi
Rare earth doped 12CaO·7Al 2 O 3 (C12A7) glass-ceramics are one of attractive photonic materials due to their high transparency, high luminescent efficiency and eco-friendly nature. A series of C12A7 glasses with different Tb 3+ doping concentrations was prepared by aerodynamic levitation method. The C12A7:Tb glass-ceramics were obtained via in-situ growth from the glasses with the identical chemical composition at 800 °C. The microstructure observation demonstrates that the elemental distributions of Ca and Al are homogeneous in the glass-ceramics and the grain size of C12A7 is 4–70 nm. The in-line transmittance of glass-ceramics reaches as high as 82% at 1500 nm. The emission spectra of the C12A7:Tb glass-ceramics present characteristic Tb 3+ emission peaks at 486 nm ( 5 D 4 → 7 F 6 ), 541 nm ( 5 D 4 → 7 F 5 ), 585 nm ( 5 D 4 → 7 F 4 ) and 621 nm ( 5 D 4 → 7 F 3 ). The photoluminescence lifetime of C12A7:0.3%Tb glass-ceramic is 1.9 ms. Compared with the emission intensity of the glasses, that of the glass-ceramics increases due to the reducing in concentration of oxygen vacancy associated with network forming (NWF) cations. The highly transparent C12A7:Tb glass-ceramics may be a promising candidate for green light source in solid state lighting.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yaling Zhang,Shuai Chao,Xi Zhang,Junguo Li,Yiming Duan,Chunhui Gu,Jiale He
The iron and steel industry is facing two urgent needs of comprehensive utilization of bulk solid waste and CO 2 emission reduction. Using LF refining slag as raw material to prepare efficient calcium-based CO 2 adsorbents can achieve the goals of waste-to-resource conversion and cleaner production. In this study, LF refining slag-derived CaO/C 12 A 7 high-temperature calcium-based CO 2 adsorbent materials with abundant pore defects were synthesized by the co-precipitation method, which showed the optimal high-temperature adsorption performance at 700 °C and pure CO 2 atmosphere, with an adsorption capacity of up to 0.681 g/g, which is 1.58 times that of the adsorption capacity of commercial CaO. C 12 A 7 , as an inert skeleton of adsorbent material, can inhibiting the agglomeration of CaO particles and slowing down the sintering deactivation process. After 20 cycles of calcination-carbonation, the adsorption capacity degradation rate was 32.5 %, lower than that of commercial CaO at 37.8 %. The related research effectively enhances the added value of resource utilization from LF refining slag and holds the potential to achieve a balance among environmental, economic, and social benefits in the steel industry.
研究领域:
材料科学
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环境科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2018
·
IF 2.687
Yannan Qian,Xunze Tang,ZhengYu Zhang,Haiyan Zhang,Maxim Ivanov,Qibai Wu
A novel multicolor-tunable lanthanide doped 12CaO·7Al 2 O 3 (Ln 3+ :C12A7; Ln 3+ = Yb 3+ , Tm 3+ and Er 3+ ) synthesized by solid-state reaction method would greatly enhance the scope of its applications ranging from infrared solar cells to field emission display . The scanning electron microscopy (SEM) was used to characterize the morphology of Ln 3+ :C12A7. Under 980 nm excitation, the emission color was tuned from green-yellow to red region through adjusting the concentrations of Ln 3+ ions. The obtained near infrared upconversion (UC) emissions in Ln 3+ :C12A7 was corresponded to “window of optical transparency”. All blue, green and red UC emissions were populated by one-photon process, and the proposed UC mechanisms were studied in Ln 3+ :C12A7.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 42
·15484-15488
·
IF 4
Xiangyu Zhang,Yunlei Chen,Yongfang Sun,Fei Wang,Xiao-Dong Wen,Tian-Nan Ye
Wide application of novel materials often requires low-cost preparation methods. In this study, we present a simplified and facile preparation method for the [Ca24Al28O64]4+(e−)4 electride material (C12A7:e−). Successful preparation of the C12A7:e− electride was confirmed by XRD patterns and magnetic behavior analysis. The concentration of electrons in the prepared C12A7:e− powder was calculated to be approximately 2.23 × 1021 cm−3, as evaluated by iodometry and TPD. DFT calculations provided insight into the unique electronic structure of C12A7:e−. Additionally, the substitution of the Ca reductant with CaH2 led to a reduction in the solid-state reaction temperature from 1100 to 950 °C, which can be attributed to thermodynamic effects such as a reduction in ΔG°.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 21
·8315-8324
·
IF 3.069
Hui Yang,Rui Wang,Yaozu Wang,Jianzhong Jiang,Xingzhong Guo
Macroporous europium-doped Ca12Al14O33 (C12A7:Eu3+) was prepared via a sol–gel method followed by heat-treatment, and the crystal structure, luminescence performance and metal ion luminescence sensing of C12A7:Eu3+ were investigated and evaluated in detail. The process of the sol–gel method and heat-treatment promotes the formation of a single mayenite phase C12A7:Eu3+, and the Eu3+ ions are incorporated into the crystal lattice and replace the position of the Ca2+ ions without destroying the lattice structure of C12A7. The interconnected macropores not only increase the lighting area but also reduce the concentration quenching effect, leading to a significant enhance of luminescence intensity. The resultant macroporous C12A7:Eu3+ can be used as a luminescence performance sensor and displays the potential practical application for metal ion detection. The macroporous C12A7:Eu3+ sensor has a good response to Pb2+ ions, whose linear equation between concentration (CPb) and luminescence intensity (F) of (F0 − F)/F0 = 1.412 + 0.3428 log10(CPb) can be obtained.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 43
·24276-24285
·
IF 2.936
Karim Khan,Ayesha Khan Tareen,Sayed Elshahat,Naseer Muhammad,Jia Li,Israa Aboodd,Luigi Bibbò,Ashish Yadav,Rizwan Ur Rehman Sagar,Usman Khan,Zhengbiao Ouyang
In the present study we synthesized conductive nanoscale [Ca24Al28O64]4+(4e−) (hereafter denoted as C12A7:e−) material, and reduced graphene oxide (rGO) was produced, which was unexpected; graphene oxide was removed after melting the sample. The conductivity of C12A7:e− composites synthesized at 1550 °C was 1.25 S cm−1, and the electron concentration was 5.5 × 1019 cm−3. The estimated BET specific surface area of the highly conductive sample was 20 m2 g−1. Pristine C12A7:e− electride was obtained by melting the composite powder, but the nano size of C12A7:e− particles could not be preserved; the value of conductivity was ∼28 S cm−1, electron concentration was ∼1.9 × 1021 cm−3, and mass density was 93%. For C12A7−xVx:e−, where x = 0.25 to 1, the conductivity improved to a maximum value of 40 S cm−1, and the electron density improved to ∼2.2 × 1021 cm−3; this enhancement in conductivity was also proposed by a theoretical study but lacked any associated experimental support.
研究领域:
材料科学
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电气工程
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）