Materials Today Sustainability
·
2023
·
IF 7.8
B. Chen,X. Yi,W. Zhan,L. Gao,Z. He,J. Zhang
Blast furnace dust (Zn–Fe dust) containing high heavy metal contents is a hazardous waste, and it is derived from the gravity dust removal system and bag dust removal system of a blast furnace. This study elucidated the underlying reasons for the poor separation of Zn and Fe and recommended conditions for the carbothermic reduction roasting process. The results indicated that the poor efficiencies for Zn and Fe separation from Zn–Fe dust were caused by the formation and gradient reduction of wustite (Fe y Zn 1-y O). A higher reduction temperature, longer reduction time and basicity created an advantageous environment for reduction of the wustite intermediate phase and enabled synergistic catalytic reduction of the wustite phase (Fe y Zn 1-y O and Fe y Ca 1-y O). The formation and reduction of the wustite phase (Fe y Zn 1-y O and Fe y Ca 1-y O) are crucial steps in reduction roasting of olivine (Zn y Fe 2-y SiO 4 ) and Zn x Fe 3−x O 4 with a spinel crystal structure. After adjusting the experimental parameters, the efficiencies for recovery of Zn and Fe from the Zn–Fe dust reached 95.12 % and 96.55 %, respectively.
研究领域:
冶金工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Wei Wang,Hang Yang,Meiqian Fu,Xinyang Zhang,Mengyu Guan,Yi Wei,Chun Che Lin,Guogang Li
Thermal quenching is still a pivotal challenge for phosphor materials in white light emitting diodes lighting applications. Herein, we propose an effective strategy to design a near zero-thermal-quenching green emission in zero-thermal-expanding Zn 4 B 6 O 13 host based on unique 3D isotropic cage structure. The integrated emission intensity of Zn 4 B 6 O 13 :Mn 2+ could maintain 103% of initial intensity at 150 °C and 98% at 250 °C under blue light excitation. During the low-frequency vibrations, the unchanged bonds and angles induce the zero thermal expansion, and the unaffected lattice and coordination environment contribute the nearly unchanged emission intensity during the heating process. In addition, an efficient self-reduction of activators in the studied system is ascribed to vacancy and interstitial oxygen defects act as donors to provide electrons. This work initiates a novel strategy to construct thermally-stable and self-reductive phosphors for multiple optical applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Xiaofeng Dai,Wen Xu,Teng Zhang,Tao Wang
Copper nanoparticles (Cu NPs) are a potential material for conductive inks because of their low price, high conductivity, and high electromigration resistance. However, Cu NPs are prone to be oxidized in air, which is lethal to conductivity. In this work, we report on the self-reduction of Cu NPs which are synthesized by the thermal decomposition of copper formate (Cuf) using oleylamine (OAM) as the complexing ligand and stabilizing agent. Although the particle surface partially oxidized to Cu2O in air, the cuprous oxide could be reduced to copper during sintering, because of the release of H2 through the decomposition of OAM adsorbed on Cu NPs. This self-reduction ability without the help of additional reduction agent makes the Cu NPs a promising material for conductive inks. The feasibility to formulate conductive ink with the prepared Cu NPs is demonstrated.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
J. Zhang,G.X. Zhang,G.M. Cai,Z.P. Jin
Due to the high sensitivity of the unshielded 5d orbit to the host environment, Ce 3+ has a wide-spread emission ranging from near ultraviolet to the red light region, making it a favorable choice for being UV-emitting phosphor activator and sensitizer of other co-doped lanthanide ions in luminescent materials. In present work, Ce 4+ →Ce 3+ self-reduction phenomenon in the layered phosphate MgIn 2 P 4 O 14 was observed. Noting that self-reduction ability is a valuable characteristic of new host materials, a new viewpoint underlying mechanism was put forward. Structure-, composition-, and temperature-dependence of photoluminescence of the new UV-emitting MgIn 2 P 4 O 14 : Ce x phosphors were investigated, with the relative mechanism discussed. Moreover, the sensitization of Dy 3+ by Ce 3+ was observed in Ce 3+ /Dy 3+ co-doped MgIn 2 P 4 O 14 phosphors. The excitation region of Dy 3+ in MgIn 2 P 4 O 14 : CeDy (220–460 nm) is markedly broadened compared to that of the Dy 3+ single-doped phosphor (270–460 nm) on account of the Ce 3+ →Dy 3+ energy transfer process . Present work shows that the MgIn 2 P 4 O 14 : CeDy phosphor can be promising phosphor using for fabrication of both light-emitting diodes (LEDs) and fluorescent lamps (FLs).
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 7
·1009
·
IF 4.034
Juanjuan Yin,Lun Zhang,Tifeng Jiao,Guodong Zou,Zhenhua Bai,Yan Chen,Qingrui Zhang,Meirong Xia,Qiuming Peng
With development of the society, the problem of environmental pollution is becoming more and more serious. There is the urgent need to develop a new type of sustainable green material for degradable pollutants. However, the conventional preparation method is limited by conditions such as cumbersome operation, high energy consumption, and high pollution. Here, a simple method named self-reduction has been proposed, to synthesize highly efficient catalytic nitro compounds and morin self-assembled MXene-Pd nanocomposites. Palladium nanoparticles were grown in situ on MXene nanosheets to form MXene@PdNPs. MXene@PdNPs composites with different reaction times were prepared by adjusting the reduction reaction time. In particular, MXene@PdNPs20 exhibited a high catalytic effect on 4-NP and 2-NA, and the first-order rate constants of the catalysis were 0.180 s−1and 0.089 s−1, respectively. It should be noted that after eight consecutive catalytic cycles, the conversion to catalyze 4-NP was still greater than 94%, and the conversion to catalyze 2-NA was still greater than 91.8%. Therefore, the research of self-assembled MXene@PdNPs nanocomposites has important potential value for environmental management and sustainable development of human health, and provides new clues for the future research of MXene-based new catalyst materials.Keywords:nanocomposites;catalyst;MXene;self-reduction;palladium nanoparticles
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 12
·126586
·
IF 1.449
Zhuangzhi Wu,Xin Liu,Dezhi Wang
A traditional preparation process of Mo powder is generally time-consuming and leads to coarse particles. In this work, we propose a short-flow strategy, in which the intermediate product of MoO2 is prepared by a one-step self-reduction method in air instead of a mixture of decomposition and hydrogen reduction processes. And the reaction mechanism of self-reduction is investigated and the consequent sintering performance of Mo powder is also compared with the traditional one. The obtained results demonstrate that the finally synthesized Mo–La2O3 powder prepared by the self-reduction strategy are spherical with an average particle size of 2.03 μm, exhibiting an excellent sintering performance with a relative density of 95.3% and a hardness of 260.6 (HV), better than those by a traditional one (93.4% and 232.4 (HV)), which can be attributed to smaller particle size and better shapes. This work provides a new route for the synthesis of Mo–La2O3 powder, indicating a possible industrial application.
研究领域:
材料科学
·
冶金工程
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Pan Liang,Lianqing Li,Tong Shen,Wenli Lian,Zhihong Liu
In this work, through a facile method of low-temperature (only 350 °C) self-reduction, 1D nano-sized M 2 B 5 O 9 Cl:Eu 2+ (M = Sr, Ca) blue phosphors with highly efficient performance can be obtained. The crystal structure, morphology and photoluminescence (PL) properties including thermal stability of M 2 B 5 O 9 Cl:Eu 2+ (M = Sr, Ca) phosphors were investigated. The M 2 B 5 O 9 Cl:Eu 2+ (M = Sr, Ca) phosphors show broad band excitation spectra and narrow band emission spectra . The photoluminescence quantum yields (PLQY) of M 2 B 5 O 9 Cl:Eu 2+ (M = Sr, Ca) are as high as 98% and 87.2%, respectively. Furthermore, the color purities of M 2 B 5 O 9 Cl:Eu 2+ (M = Sr, Ca) can reach 99.1% and 93.2%, respectively. When heated up to 150 °C, the emission intensities of M 2 B 5 O 9 Cl:Eu 2+ (M = Sr, Ca) phosphors can still keep 72.7% and 80.0%, respectively. Finally, the above-mentioned phosphors exhibit outstanding performance when manufacturing WLEDs.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 16
·2966-2975
·
IF 3.756
Shuang-Yin Zhu,Dan Zhao,Shao-Jie Dai,Rui-Juan Zhang,Lin-Ying Shi
For Mn-activated phosphors, the luminescent performance is strongly dependent on the oxidation state of Mn. In this paper, a series of red phosphors NaMg(PO3)3:xMn2+ (NMP:xMn2+) were synthesized by high temperature solid-state reaction in the open atmosphere. The single oxidation state of Mn2+ was confirmed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and photoluminescence spectroscopy (PL). We suspected that a self-reduction process occurred to prevent the oxidation of Mn2+. The doped Mn2+ ions occupy the strong crystal field environment of the Mg site (octahedral point), forming a red luminescence center with a peak position centered at 630 nm and a full width at half maximum (FWHM) of 80 nm. The thermal stability and quenching luminescence are explained by the temperature dependence of the PL spectrum. The results show that the NaMg(PO3)3:Mn2+ red phosphor has potential applications in LED backlight display areas.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zhicong Chen,Peishan Shao,Puxian Xiong,Yao Xiao,Bingjun Liu,Zhiduo Wang,Sheng Wu,Dongliang Jiang,Kang Chen,Jiulin Gan,Dongdan Chen,Zhongmin Yang
Mechanoluminescence (ML) is the nonthermal luminescence generated in the process of force-to-light conversion, which has broad prospects in stress sensing, wearable devices, biomechanics, and multiple information anticounterfeiting. Multivalence emitter ions utilize their own self-reduction process to realize multiband ML without introducing another dopant, such as Eu3+/Eu2+, Sm3+/Sm2+, and Mn4+/Mn2+. However, self-reduction-induced ML in bismuth-activated materials has rarely been reported so far. In this work, a novel visible-to-near-infrared (vis–NIR) ML induced by the self-reduction of Bi3+ to Bi2+ in the spinel-type compound (MgGa2O4) is reported. The photoluminescence (PL) spectra, PL excitation (PLE) spectra, and PL lifetime curves demonstrate that Bi3+/Bi2+ ions are the main luminescence centers. Notably, the possible self-reduction model is proposed, where a magnesium vacancy (VMg″) is considered as the driving force for the self-reduction of Bi3+ to Bi2+. Furthermore, an oxygen vacancy (VO••) is confirmed by electron paramagnetic resonance (EPR) spectroscopy. Combined with thermoluminescence (TL) glow curves and ML spectra, a plausible trap-controlled ML mechanism is illustrated, where electron–hole (VO••/VMg″) pairs play a significant role in capturing electrons and holes. It is worth noting that the proof-of-concept dual-mode electronic signature application is implemented based on the flexible ML film, which improves the capabilities of signature anticounterfeiting for high-level security applications. Besides, multistimulus-responsive luminescence behaviors of the ML film are realized under the excitation of a 254 nm UV lamp, thermal disturbance, 980 nm laser, and mechanical stimuli. In general, this study provides new insights into designing vis–NIR ML materials toward wider application possibilities.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Ying Li,Jiaqi Ou,Shuangqiang Fang,Jiali Yu,He Lin,Haoliang Cheng,Xiulan Shui,Renjie Xu,Zhijie Ye,Le Wang
Due to the wide and adjustable emission range, Ce 3+ is an indispensable luminous center for full spectrum lighting. However, it needs to be sintered at high temperature in a reducing atmosphere, resulting in difficulty to coexisting with other multivalent activated ions (such as Eu 3+ , Tm 3+ ), which greatly hinders the formation of full spectrum. In this study, a calcium vacancy enhanced self-reduction of Ce 4+ is realized in CaNaSb 2 O 6 F (CNSOF) host under air atmosphere sintering, through which Ce 3+ , Tm 3+ and Eu 3+ coexisting in a single-phase full spectrum phosphor was prepared. Notably, the artificial introduction of a calcium vacancy was designed to verify this self-reduction mechanism. Moreover, the energy transfer kinetics among Tm 3+ , Ce 3+ and Eu 3+ were explored. Finally, combined with a 340 nm UV chip, a full spectrum phosphor-converted light-emitting diode (pc-LED) was fabricated, showing a broad emission range from 400 to 750 nm, Commission Internationale de I’Eclairage (CIE) of (0.3485, 0.3673), Ra of 92 and correlated color temperature (CCT) of 4933 K. Utilizing the variation in emission colors of this phosphor under different UV wavelengths, a dual encryption method combining point character code and fluorescent encryption technique is proposed. This work provides an effective path for Ce 4+ self-reduction to apply in full spectrum pc-LED and information encryption.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Surface Topography-Metrology and Properties
·
2022
·Vol. 10
·期 1
·015039
·
IF 2.185
Xiaolin Li,Gang Kong,Jingwen Zhang,Delin Lai,Chunshan Che,Bo Yang,Shuanghong Zhang,Jiayu Gu
Conductive metals can speed up the self-assembly and reduction process of graphene oxide (GO) in liquid media, but there is little available information about the effect of this process on the corrosion rate of metal substrates. The corrosion performance of Q235 steel in GO aqueous solution was studied by comparing the influence of different GO concentrations and immersion times on the corrosion rate of steel. The result found that a GO layer will be formed on the surface of steel when immersing in the GO aqueous dispersion, which has a shielding effect on the diffusion process of ions and electrons, and effectively inhibits the steel corrosion. However, this inhibition effect of GO layer will disappear with the self-reduction of GO, which increasing the defect density and conductivity of the sedimentary layer on steel and thus the corrosion rate of steel will increase with the immersion time and the GO concentration in solution.
研究领域:
材料科学
·
腐蚀工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Yulei Yuan,Houya Wu,Junjie Li,Pengli Zhu,Rong Sun
The development of WBG (wide bandgap) semiconductors has put forward higher requirements for packaging and interconnection technology. Cu sintering is widely considered as an advanced interconnection technology which can be used in high temperature and high power density service. In this paper, a new type of self-reducible Cu nanoparticle paste was proposed to solve the problems of easy oxidation and high sintering temperature of normal Cu nanoparticles. The proposed Cu paste was developed by mixing formic acid treated Cu nanoparticles, reducing solvents and MOD (metal organic decomposition) solutions. Based on the new type of self-reducible Cu nanoparticle paste, Cu-Cu bonding experiments were carried out with different bonding temperature and time, and a reliable Cu-Cu joint with a high shear strength of 52.01 MPa can be achieved at 250 °C under ambient condition, without any assistance of reducing or inert atmosphere. In addition, the MOD assisted self-reduction and sintering mechanism was proposed after shear strength testing, element composition analyzing, cross-sectional morphology and fracture structure observation, which can provide an effective theoretical support for the practical application of Cu-Cu bonding.
研究领域:
材料科学
·
电子封装技术
✓ 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）