JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Dilare Halmurat,Xinyu Zhang,Litipu Aihaiti,Rong-Jun Xie
Eu 2+ -doped phosphors show broadband absorption, tunable emission and high quantum efficiency due to the parity-allowed 5d→4f transitions, allowing them to be used in solid-state lighting. To expand their applications in other fields such as detection and sensing technologies, the Eu 2+ emission needs to be tuned into the near-infrared region, but it is a big challenge to obtain Eu 2+ near-infrared region emitters due to the absence of host compounds with extremely large crystal-field splitting. In this work, we chose M 4 Li(BN 2 ) 3 (M = Ca, Sr, Ba) as a host and realize the near-infrared region emission of Eu 2+ in it. Among these phosphors, Ba 4 Li(BN 2 ) 3 :Eu 2+ exhibits the longest emission of 880 nm and the largest full-width at half maximum of 276 nm under 450 nm excitation, while Ca 4 Li(BN 2 ) 3 :Eu 2+ and Sr 4 Li(BN 2 ) 3 :Eu 2+ emit at 740 and 680 nm, respectively. We observe an interesting phenomenon that the energy shift of emission is linearly related to the radius difference between the alkaline earth cation and the activator Eu 2+ in this system.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
MARINE BIOTECHNOLOGY
·
2025
·Vol. 27
·期 6
·155
·
IF 2.8
Xiang Jionghua,Wu Qiming,Xu Kai,Liu Qun,Nie Yusen,Weng Wuyin,Zhang Yucang,Wang Haiqi
At present, shells have been used to incubate Pyropia haitanensis ( P. haitanensis ) shell-boring conchocelis. To develop a more convenient substrate for P. haitanensis conchocelis cultivation, a novel P. haitanensis shell-boring conchocelis culture substrate (CaCO 3 /LPE/CA) was developed from calcite, low-density polyethylene, and calcium alginate. The mechanical properties and stability of CaCO 3 /LPE/CA, including implanting density (ID) and Yield per unit area, were tested. The results showed that the CaCO 3 /LPE/CA met practical P. haitanensis shell-boring conchocelis breeding application requirements. P. haitanensis was successfully cultured on CaCO 3 /LPE/CA, and its life cycle was observed through biomicroscopy and scanning electron microscopy (SEM). After conchospores was succrssfully reseased from P. haitanensis conchosporangial branch, the movement and germination of conchospores were also observed. The yield of conchospores per unit area of optimized CaCO 3 /LPE/CA reached 369.6 × 10 3 conchospores/cm 2 , making it a suitable candidate for P. haitanensis shell-boring conchocelis cultivation. Overall, CaCO 3 /LPE/CA exhibits great potential as a marine bioactive material, and the process and cost of P. haitanensis culture breeding could be simplified due to its comprehensive characteristics.
研究领域:
藻类学
·
海洋生物技术
·
水产养殖
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energy Storage Materials
·
2019
·
IF 0
Liang Teng,Yimin Xuan,Yun Da,Xianglei Liu,Yulong Ding
The thermochemical energy storage based on Calcium looping (CaL) process shows great potential for the application in the 3 rd generation Concentrated Solar Power (CSP) compared to other high-Temperature heat storage schemes. However, due to the inherent low solar absorptance of CaCO 3 , the surface heating mode is widely adopted in the conventional CaL-CSP system, which causes large thermal resistance and severe radiative heat loss . Herein, we propose achieving direct solar absorption in the CaL-CSP system through enhancing the CaCO 3 ’s ability to capture thermal energy from the concentrated solar irradiation . Efforts are devoted to design and fabricate a modified CaL material by doping CaCO 3 with some materials with high solar absorptance . In order to obtain a highly stable CaL, the cyclic performance of the composite material is investigated and optimized. The calcium gluconate ((Ca(C 6 H 11 O 7 ) 2 )) was used as the precursor while fabricating the porous CaCO 3 , and the Mn–Fe oxides were doped into CaCO 3 through two different doping processes. The experimental results indicate that the proposed material obtains the solar absorptance of ∼90%. The heat release efficiency (equal to carbonation activity) remains over 92% in 60 cycles, which is much higher than that of the commercial CaCO 3 powder (20% after 60 cycles). The proposed calcium-based thermochemical energy storage material is expected to dramatically improve both the solar utilization efficiency and cyclic stability of the integrated CaL-CSP system.
研究领域:
储能技术
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太阳能
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材料科学
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化学工程
·
可再生能源
✓ 已验证
产品关联
DOI
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Changhui Zhao,Huimin Gong,Gaoqiang Niu,Fei Wang
Sensitivity and selectivity of metal oxide semiconductor-based gas sensors are two crucial criteria. In this work, a highly sensitive and selective ethanol sensor has been prepared based on Ca-doped In 2 O 3 nanotubes (Ca-In 2 O 3 NTs). The products were synthesized by a simple electrospinning method with subsequent annealing in air. The crystal structure and morphology of as-obtained products are obviously affected by Ca-doping levels (1–10 mol%). X-ray diffraction and electron paramagnetic resonance results reveal that some Ca dopants (≤3 mol%) can enter the lattice of In 2 O 3 with the decreasing grain size, and an enrichment of the oxygen vacancies. In contrast, the grain size of Ca-In 2 O 3 NTs increases dramatically with further increase of Ca concentration (7–10 mol%), and the excessive Ca dopants tend to form a new CaIn 2 O 4 phase. Gas-sensing measurements demonstrate that the Ca-In 2 O 3 sensors exhibit enhanced ethanol sensing properties with respect to the pure In 2 O 3 sensor. Especially, the 3% Ca-In 2 O 3 sensor shows the highest response (183.3, at 100 ppm) with the excellent selectivity for ethanol detection at 240 °C. Such sensitive and selective ethanol detection is mainly based on the “doping effect” of Ca 2+ ions, suggesting an effective route to develop the ability of In 2 O 3 based gas sensors.
研究领域:
材料科学
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传感器技术
·
纳米科技
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 105
·60460-60466
·
IF 3.708
Shuxian Huang,Zuoyi Xiao,Shangru Zhai,Bin Zhai,Feng Zhang,Qingda An
To enhance the stability of a catalyst that uses alginate as a carrier, Ag nanoparticle-loaded glutaraldehyde-crosslinked calcium alginate (Ag/CA@GTA) hydrogel beads were prepared. The Ag/CA@GTA hydrogel beads were characterized by UV-visible spectroscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, transmission electron microscopy and X-ray photoelectron spectroscopy analyses. Given that the mechanical strength of the support was remarkably enhanced by crosslinking alginate with GTA, the resulting Ag/CA@GTA beads exhibited high stability and durable activity, with more than 97% conversion within 10 successive cycles, for the catalytic reduction of 4-nitrophenol to 4-aminophenol by NaBH4 in aqueous solution. These Ag/CA@GTA hydrogel beads were expected to have potential as a highly efficient, cost-effective and eco-friendly heterogeneous catalyst for industrial applications.
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
OPTICS EXPRESS
·
2013
·Vol. 21
·期 13
·15728-15733
·
IF 3.546
Renping Cao,Fangteng Zhang,Chenxing Liao,Jianrong Qiu
RF2:Bi (R = Ca and Sr) phosphors were synthesized by solid state reaction method in air and their luminescence properties were investigated. Broad yellow-to-orange emissions peaking at ~550 nm (CaF2:Bi) and ~600 nm (SrF2:Bi) were observed under ~260 nm excitation. The emission centers inRF2:Bi (R = Ca and Sr) phosphors are Bi2+ ions, and the excitation and emission bands ofRF2:Bi (R = Ca and Sr) phosphors can be attributed to 2P1/2→2S1/2 and 2P3/2(1) →2P1/2 transitions of Bi2+ ions, respectively. The phosphors are promising for application in lighting due to broad yellow-to- orange emission.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2023
·Vol. 16
·期 4
·1568
·
IF 3.4
Feng Wang,Yaoqi Gu,Jianrui Zha,Shuya Wei
Ca(OH)2nanoparticles are effective materials for cultural heritage restoration, hazardous substance absorption and photocatalyst. However, many methods are complex, and the particle sizes are usually above 80–100 nm, involving mediocre efficacy for application in the stone restoration field. In this work, Nano Ca(OH)2with diameters less than 70 nm and composited with Graphene Quantum Dots (GQDs) were successfully synthesized in aqueous media. The morphology and structure of the nanoparticles were investigated with TEM, HRTEM, XRD, Raman and FTIR. The particle size distribution and relative kinetic stability of the Ca(OH)2in ethanol were performed using a laser particle size analyzer and spectrophotometer. Firstprinciple calculations based on the spin-polarized density functional theory (DFT) were carried out to study the reaction process and combination model. The nanoparticles, as prepared, are composed of primary hexagonal crystals and high ammoniated precursors, which have a positive effect on reducing the grain size, and interacted with the GQDs hybrid process. According to the First-principle calculations results, the energy variation of the whole reaction process and the bonding mode between Ca(OH)2and GQDs can be understood better.Keywords:Ca(OH)2;Graphene Quantum Dots;DFT;complex;nanoparticles
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yuqi Zhang,Di Zhang,Pengwei Lei,Ziyan Yang,Zhikun Zhang
Metal-organic frameworks (MOFs) are a promising material for CO 2 adsorption because of their great specific surface area, well-ordered porous structures ordered porous structure and various means available for functionalization. In this work, the calcium squarate (UTSA-280) was synthesized from carbide slag without pretreatment at room temperature by a rapid mechanochemical method, and then was further functionalized with tetraethylenepentamine (TEPA) to prepare CO 2 adsorbents. The effects of water content, ball milling frequency, adsorption temperature, and TEPA loading on CO 2 adsorption performance of various adsorbents were investigated. The results showed that the CO 2 adsorption of the synthesized MOFs increased firstly and then decreased with increasing water content and ball milling frequency. The synthesized MOFs with water content of 300 mmol and ball milling frequency of 15 HZ exhibited the best crystallinity. The addition of TEPA provided additional adsorption sites and led to the increase of CO 2 adsorption capacity. The UTSA-280–300-15-40TEPA demonstrated the highest CO 2 adsorption capacity (2.89 mmol/g) at 25 °C. The CO 2 adsorption kinetics analysis showed that the Avrami model fitted well with the experimental results. Furthermore, the UTSA-280–300-15-40TEPA exhibited excellent chemical stability during the adsorption–desorption cycles, with only a 14.53 % decrease in adsorption capacity after 10 cycles. This work demonstrated the possibility of preparing UTSA-280 using carbide slag for effective CO 2 adsorption.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Kepi Chen,Jinxu Ma,Chuanxi Tan,Cuiwei Li,Linan An
In this paper, we explored the possibility of forming single-phase high-entropy fluorite oxides (HEFOs) in the (Ce 0.2 Zr 0.2 Ti 0.2 Sn 0.2 M 0.2 )O 2-δ (M = Mg, Y, Yb, and Ca) system. The result showed that single-phase high-entropy fluorite can only be obtained from (Ce 0.2 Zr 0.2 Ti 0.2 Sn 0.2 Ca 0.2 )O 2-δ . Compared with other reported anion-deficient HEFOs, this material has the lowest rare earth element content, the smallest average cationic radius and the lowest theoretical density. The effects of cation radius and starting materials on the formation of single-phase HEFOs are discussed.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Bin Qi,Tiantian Chen,Zhifeng Liu,Jinqiu Qi,Qi Wang,Wenming Zhang,Xiaochen Li
To overcome the shortcomings of separation and recovery difficulties of powdered catalysts in practical applications, a novel flexible catalyst film (2D-WO 3 /CA) was formed by combining 2D-WO 3 with cellulose acetate (CA), and successfully applied in degrading organic pollutants in water under real solar irradiation. The structure, morphology and optical properties of the new photocatalytic film were characterized by using X-ray diffraction, scanning electron microscope and UV–vis diffuse reflectance spectra technology , respectively. The results showed that the absorption edges of 2D-WO 3 /CA film shifted remarkably to the longer wavelength compared with 2D-WO 3 , indicating that 2D-WO 3 /CA film could broaden the spectral response range. Furthermore, the photocatalytic capacity of the film was explored by degrading methylene blue (MB) in aquatic solution under real sunlight in the continuous baffled photo-reactor (CBPR). The film exhibited excellent degrading properties with an average removal rate of 85% for MB, and the processing load corresponded to 478.13 mg/(m 2 ·d). The film still had high activity and flexibility after treating wastewater for seven consecutive days. Therefore, the new 2D-WO 3 /CA film is promising in actual dye wastewater treatment . Based on the above analysis, MB degradation mechanism in the photocatalytic system with 2D-WO 3 /CA film was proposed finally.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Case Studies in Thermal Engineering
·
2023
·
IF 6.8
Huan Li,Xiaoyang Yu,Ke Qiu,Bing Bo,Qian Li,Shouxiang Lu
The active ingredients for aqueous film-forming foam (AFFF) are supplied as a concentrate, and the water used to dilute AFFF concentrates generally come from water sources around the fire site including seawater and river water. However, the effects of salt in water on fire-extinguishing performance of AFFF remain unclear. In this paper, we investigated the relationship between the interfacial properties, foam stability, and fire-extinguishing performance of three homemade AFFFs (nonionic AFFF APG , amphoteric AFFF CAB and anionic AFFF SDS ) and four commercial AFFFs. The seawater, firefighting water from different regions of China and deionized water were used to dilute AFFF concentrates. The results showed that AFFF APG and AFFF CAB had a better performance than AFFF SDS in resisting the negative effects of salts on interfacial properties and foaming ability. In the fire-extinguishing tests, we found that dilution of AFFF with water samples containing high concentrations of Ca 2+ and Mg 2+ would weaken the fire-extinguishing performance. The traditional indicators characterizing the properties of foam (surface tension, liquid drainage rate, and spreading coefficient) could not explain the trend of fire extinguishing performance. The stability of AFFF in the presence of oil could be used to explain the difference in fire-extinguishing time of AFFF.
研究领域:
火灾科学
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Chuan-Fu Deng,Shi-Hao Yang,Rui Xie,Xiao-Jie Ju,Zhuang Liu,Da-Wei Pan,Jianhong Xu,Guangsheng Luo,Wei Wang,Liang-Yin Chu
Modular microfluidic integration, which is powerful for controllable mass production of droplets, usually suffers from limited dimension choice and complicated calculations. Here, a generalized and simple strategy based on stepwise nesting of basic fractal networks to create nested flow distribution networks for modular microfluidic integration is proposed. The H-shaped fractal network with a symmetrical flow-resistance setup and the widely used ladder network are respectively used as the typical basic fractal network and the control group. Compared to the control group, the nested fractal networks enable more flexible choices of microchannel dimensions for uniform flow distribution. The integrated fractal modular device with 256 flow-focusing microchannels can massively produce droplets with size monodispersity remarkably better than those from the control group device and can create monodisperse Ca-alginate microspheres from viscous liquids. This strategy provides a rational scale-up guideline to create modular devices with uniform flow distributions for mass production of monodisperse microdroplets.
研究领域:
生物工程
·
微流控技术
·
材料科学
✓ 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）