Journal of Materials Chemistry C
·
2024
·
IF 5.7
Qiao Qu,Haiyan Zhang,Haipeng Ji
The parity-selection rule for the Mn4+ d→d intra-configurational transition, if being relaxed, would generate Mn4+-doped red-emitting phosphor with short fluorescence lifetime, a desired feature when a phosphor is used in a white light-emitting diode (WLED) lamp applied as backlight in displays. We design non-equivalent substitution of Mn4+ for Mo6+ coordinated with F−/O2− mixed-anions, and obtained K3Na(MoO2F4)2·H2O:Mn4+ red phosphor which exhibits fast decay (luminescence lifetime of ~2 ms) and intense zero phonon line (ZPL) emission at 623 nm (ZPL/ν6 intensity ratio of 65.7% at 300 K) under 470 nm excitation. The local octahedron distortion accounting for the luminescence features was discussed and the crystal field strength and nephelauxetic effect were compared with analogues. The increasing trend of the ZPL/ν6 intensity ratio from 300 K to 80 K was explained, and the luminescence decay of a series of Mn4+ doping concentrations was studuied. The K3Na(MoO2F4)2·H2O:3%Mn4+, when encapsulated with garnet green phosphor on a blue LED, produced a WLED backlight with a wide color gamut above 103.5% of the NTSC standard.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Pengtao Lei,Xiangyang Xu,Chenyu Huang,Dongsheng Chen,Zhenkun Jiang
To optimize the proton transport performance of polyvinylidene fluoride (PVdF), a proton exchange membrane (PEM) material, carbon nanotube (CNT), and zirconium hydrogen phosphate (ZrP) have been blended into the PVdF matrix. Adopting a hydrothermal synthesis route, the acidic ZrP can be better conjugated with the positively charged CNT functionalized by cetyltrimethylammonium bromide (CTAB). As visualized using electroscopes, ZrP nanocrystallines are intimately dotted and homogeneously distributed on CNT. The ZrP–PVdF interaction can be attributed to hydrogen bonding between hydroxyl and F-terminal groups. By incorporating well CNT/ZrP into PVdF via solution casting, the pore architecture can be regulated; namely, the macro-voids in PVdF are greatly reduced. The composite membranes exhibit tensile stress of 48–52 MPa while sustaining the thermal stability of PVdF. The incorporated CNT/ZrP can suppress void porosity and enhance film hydrophilicity. With improved wettability, the methanol permeability can be reduced to less than 2 × 10 −9 cm 2 ∙s −1 , ca. one-sixth that of pure PVdF. The proton conductivity for PVdF-CNT 0.03 -ZrP 0.06 , with CNT and ZrP mass content respectively 3 and 6 wt% that of PVdF, attains 0.089 S·cm −1 at 100°C, showing upgraded conducting capability. The membrane selectivity can be remarkably enhanced, verifying that CNT/ZrP blending is a facile and profitable approach for PEM optimization.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2010
·
IF 1.695
Xueqiao Xie,Juan Han,Yun Wang,Yongsheng Yan,Guowu Yin,Weisheng Guan
Experimental liquid−liquid equilibrium (LLE) binodal curves, tie-lines, and plait points were obtained for the PPG400 + salt (K3PO4, K2CO3, and K2HPO4) + H2O systems at T = 298.15 K. The Merchuk equation was used to correlate the binodal data of the investigated systems. Also, the effect of salt on the phase-forming ability has been studied based on the effective excluded volume (EEV) values from fitting the binodal data to the binodal model developed by Guan, and the salting-out abilities of the anions are in the order of PO43− > HPO42− > CO32−, which may be related to the Gibbs free energy of hydration of the ions (ΔhydG). Furthermore, tie-line compositions were correlated using the Setschenow-type, Othmer−Tobias, and Bancroft equations, and the parameters are reported.
研究领域:
化学
·
生物学
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NANOTECHNOLOGY
·
2020
·Vol. 31
·期 14
·145717
·
IF 3.551
Wei Yue,Meifeng Hao,Bin Yu,Ruizhuo Ouyang,Yuqing Miao
The synthesis of inorganic micro-/nano-materials by dry combustion is somewhat dangerous since it is performed under high temperature. The ultrathin Bi nanofilms with 3D structures were synthesized using a safe approach of non-combustion explosion in H2O/DMF solution at room temperature and atmospheric pressure. The violent reaction between H2O2 and NH3 · H2O resulted in a non-combustion explosion due to the fast evolution of gases. Then under high temperature and high pressure during solvothermal process, the further slight explosion occurred where the oxygen-containing molecules of H2O2 and NO3− acted as oxidants, while the hydrogen-containing molecules of NaBH4, NH3 · H2O and DMF acted as reductants. The release of gases was accompanied with BiIII reduction by NaBH4. The 3D structure of ultrathin Bi nanofilms with many void spaces formed due to the explosive force and foams from the sharp liberation of gases. Such ultrathin Bi nanofilms with 3D structure exhibited outstanding catalytic activity for p-nitrophenol hydrogenation which is important to treat the environmental pollution from p-nitrophenol discharge. Within only several seconds p-nitrophenol hydrogenation was completed without delay. The non-combustion explosion exhibits potential applications for the synthesis of 3D ultrathin film materials as high efficient catalysts.
研究领域:
材料科学
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环境科学
·
化学工程
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JOURNAL OF SOLUTION CHEMISTRY
·
2025
·Vol. 55
·期 2
·290-305
·
IF 1.3
Cui Rui-Zhi,Nie Guo-Liang,Ren Hong-Bao,Yang Qiu-Ye,Li Wu
Based on mother liquor rich in lithium, strontium and bromine obtained from the brine of underground oil–gas field in Qaidam Basin after pre-treatment, the isothermal dissolution equilibrium method was used to study the stable solid–liquid equilibria and phase diagrams of the quinary system LiBr − NaBr − KBr − SrBr 2 − H 2 O and its subsystems at 298.15 K. The solubilities of solids in each system were determined, respectively, and the equilibrium solid phases were determined. In order to clearly reflect the regularities and characteristics of phase equilibria of multi-component systems, the corresponding phase diagrams were also plotted and analyzed. The Pitzer model for the quinary system was parameterized by using relevant experimental thermodynamic data. The solubilities of solids in this quinary system and its subsystems were calculated and compared with experimental results. The results not only help to reveal the thermodynamic behavior of relevant bromides in the process of brine concentration, but also provide some theoretical support for the comprehensive utilization of its brine resources.
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高影响因子
CRYSTENGCOMM
·
2026
·
IF 2.4
Pengfei Ouyang,Weiwei Li,Dingshan Zheng,Nian Cheng,Han Pan
All-inorganic CsPbBr3 perovskite solar cells exhibit excellent humidity and thermal stability compared with organic-inorganic hybrid perovskite solar cells. However, the proposed two-step spin-coating method for fabricating CsPbBr3 film using highly concentrated CsBr/H2O solution in the second step is prone to result in CsPbBr3 film with high defect density, which greatly limits the performance of CsPbBr3 perovskite solar cells. In this study, appropriate amount of NH4Ac is used as additive in the CsBr/H2O solution. The interaction of NH4Ac with CsPbBr3 could contribute to smooth and densified CsPbBr3 perovskite films with suppressed defect density. When carbon electrode based CsPbBr3 perovskite solar cells are fabricated, an optimized photovoltaic conversion efficiency of 8.77% is achieved using 0.50 mg mL-1 NH4Ac in CsBr/H2O solution, which is 23.35% higher than that of the reference perovskite solar cell (champion PCE = 7.11%). Furthermore, the optimized CsPbBr3 perovskite solar cell exhibits better long-term stability, which can maintain more than 85% of its initial efficiency after being placed for 30 days at an ambient temperature of 25 °C and a relative humidity of 30%~40%.
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POLYMER COMPOSITES
·
2025
·
IF 4.7
Yifeng Lai,Jun Liu,Xiaowei Hu,Yiju Zhu,Yuting Yang,Xuan Yang,Guowen Peng,Songbo Tan
The development of efficient gamma-ray shielding materials is crucial for addressing increasingly complex radiation environments. In this study, (BiO) 4 CO 3 (OH) 2 (BCH) and (BiO) 4 CO 3 (OH) 2 @Gd 2 O(CO 3 ) 2 ·H 2 O (BG) fillers were synthesized via a hydrothermal method. After being dispersed into epoxy resin by mechanical stirring, the mixtures were molded using a vacuum-assisted thermal curing process. Under 59.5 keV gamma irradiation, the linear attenuation coefficient (LAC) of BG/EP-50 reached 5.8 cm −1 , representing an 84% increase compared to BCH/EP-50 (3.15 cm −1 ) and about 33 times that of pure EP (0.17 cm −1 ). In addition, the temperature at 50% weight loss (T 50% ) of BG/EP-50 increased to 637.9〬C, which is 60.9% higher than that of the epoxy matrix, indicating improved thermal stability. The BG filler, constructed through a simple two-step hydrothermal route, demonstrated a synergistic effect between Bi and Gd components, which not only compensated for the limitations of Bi in the low-energy region but also enhanced the gamma shielding capability of the epoxy resin at higher energies. Compared to several shielding materials reported in recent years, BG/EP-50 shows superior performance and offers a promising strategy for lightweight and environmentally friendly polymer-based gamma shielding materials.
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 34
·18221-18229
·
IF 8.867
Chu Liang,Sheng Liang,Yang Xia,Yun Chen,Hui Huang,Yongping Gan,Xinyong Tao,Jun Zhang,Wenkui Zhang
Hierarchical porous carbon (HPC) has attracted much attention in tackling global environmental and energy problems. For the state-of-the-art routes to synthesize HPC from organic compounds, the emission of carbon dioxide (CO2) and gaseous pollutants is inevitable during thermal carbonization. Herein, we report an environmentally benign and high-yield route to synthesize HPC from CO2via H2O-induced self-propagating reactions. By introducing an initiator of H2O, CO2 can react with lithium hydride (LiH) to produce HPC in 13 seconds at low temperatures. The as-synthesized HPC exhibits an interconnected micro–meso–macropore network structure with a high porosity of 83%. The formation mechanism of HPC is discussed on the basis of the conversion reactions from CO2 to C and the gas blowing effect in producing hierarchical porosity. The HPC evaluated as an anode material for lithium-ion batteries not only delivers a high reversible capacity of ∼1150 mA h g−1 at a current density of 0.2 A g−1, but also exhibits superior rate capability (∼825 mA h g−1 at 1.0 A g−1) and excellent cycling properties (up to 2000 cycles). This research opens a new avenue both to synthesize HPC from CO2 on a large scale and to mitigate greenhouse gas from the atmosphere.
研究领域:
材料科学
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环境科学
·
能源科学
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yingnan Wang,Yiyuan Liu,Shujuan Jiang,Shaoqing Song
The decreased reaction activation energy and energetic carrier transfer kinetics behavior for H 2 O overall splitting concerning with the conducive chemisorption, and oriented conversion of *H and *OH are significantly important for efficiency and separation of H 2 generation. Herein, the concerns are addressed with crystal strain engineering induced by regulating Mo S and Ce O bonding lengths of CeO 2 /MoS 2 hetero photocatalysts to boost carrier transfer behavior and synergistically activate surface sites for eminent H 2 photocatalytic evolution. Ultrafast spatiotemporal atomic scale characterizations verify that CeO 2 /MoS 2 hetero photocatalysts endow an amplified polarization field pointing from the hexagonal MoS 2 {002} to cubic-phase CeO 2 {200} with an enlarged intensity to ~2.22 times, so prolonging the lifetime of charge carrier up to ~457 % on surface sites. Also, Mo 3 d and Ce 3 d as exposed surface redox sites by extending Mo S and Ce O promote chemisorption of *H and *OH, respectively, along with activation energy of H 2 O splitting down to ~73 %. Efficiencies for solar to H 2 from 1.30 % at 25 °C to 3.53 % at 60 °C under AM 1.5G are achieved, with the release of many H 2 bubbles. Our study highlights crystal strain engineering to synergistically regulate charge transfer behavior and surface site activation for photocatalytic H 2 production efficiency and releasing.
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高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Xiao-Bao Li,Chun-Li Hu,Fang Kong,Jiang-Gao Mao
Two new antimonous phosphates, namely Ba3Sb2(PO4)4 and Cd3Sb2(PO4)4(H2O)2, have been successfully prepared through mild hydrothermal reactions. Ba3Sb2(PO4)4 features a 1D [Sb(PO4)2]3– chain structure separated by Ba2+ cations while Cd3Sb2(PO4)4(H2O)2 presents a 2D [Sb(PO4)2]3– layered structure with Cd2+ located at the interlayer space. The [Sb(PO4)2]3– chain in Ba3Sb2(PO4)4 is the first example of 1D antimonous phosphate structure, and Cd3Sb2(PO4)4(H2O)2 represents the first d10 transition metal antimonous phosphate. Based on UV–vis–NIR spectra, both Ba3Sb2(PO4)4 and Cd3Sb2(PO4)4(H2O)2 can display large optical band gaps (4.30 and 4.36 eV, respectively). But their transparent ranges are quite different because of the coordination water of Cd3Sb2(PO4)4(H2O)2 (500–2000 and 500–1300 nm for Ba and Cd compounds). The anhydrous Ba3Sb2(PO4)4 shows high thermal stability in the nitrogen atmosphere (900 °C). Because of the incorporation of the lone pair cation of Sb(III), the birefringence of Ba3Sb2(PO4)4 and Cd3Sb2(PO4)4(H2O)2 has been enhanced to 0.086 and 0.053 at 532 nm, respectively.
研究领域:
无机化学
·
材料科学
·
光学材料
·
晶体学
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Shuyang Shi,Baozhong Ma,Shuang Shao,Yongqiang Chen,Chengyan Wang
An original technology named HNO3 pressure leaching has been proposed by our team to leach Al from coal gangue and fly ash. Although the preliminary separation of Al and Fe had been achieved during leaching, a small amount of Fe impurity was still unavoidably dissolved into the leach liquor. To obtain pure Al2O3 during subsequent pyrolysis, it is imperative to synchronously remove Fe3+ during the crystallization of Al(NO3)3·9H2O. Herein, the phase equilibria of the Al(NO3)3–Fe(NO3)3–H2O(−HNO3) system at 25–40 °C and 0–8.12 mol kg–1 of HNO3 molality were investigated. The results indicated that the ternary system was a simple cosaturated type consisting of an immutable point, two univariate curves, and two crystallization regions. Notably, the solubility and crystallization region of Al(NO3)3·9H2O were barely impacted by acidity, while the opposite was true for Fe(NO3)3·9H2O. This finding was instructive for the crystallization of Fe(NO3)3·9H2O from the liquor with high Fe and low Al. Moreover, a high crystallization yield could be obtained at low temperatures. Finally, an appropriate crystallization procedure was provided. This study is expected to provide basic data and theoretical support for the crystallization and separation of mixed nitrates containing Al and Fe.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Zhongshu Li,Yuli Xue,Xiaoling Tan,Wenqing Li,Shaonan Xu,Ziyan Wang,Jian Wang,Lina Li,Shiding Miao
It is of great importance to separate potassium salts from carbonate-based lakes, especially the low-[K+] but high-[Na+] brine which has been discovered around the world. Here the phase diagram of the quaternary system Na+, K+//Cl–, CO32––H2O was experimentally studied at 298.15 K via the method of isothermal evaporation, and the results corrected the previous diagram reported by Blasdale (J. Am. Chem. Soc.1923, 45, 2935–2946). The type of salts appeared and their solubility during the evaporation, and the density vs composition diagram and the pH values were plotted based on the experimental data. It was found that there were six invariant points, seven univariant curves, and five crystallization fields in the equilibrium phase diagram. To extract single-salt of potassium, certain areas in the Na+, K+//Cl–, CO32––H2O diagram were chosen to be acidified by the compressed CO2, and potassium in the form of KHCO3 was precipitated from the mother solution. The compressed CO2 was able to avoid formation of NaKCO3·6H2O during evaporation of the original system Na+, K+//Cl–, CO32––H2O. Based on experiment data, the region area for potassium salt extraction was determined, and this area was suitable for extracting K+ salts from brines with a [Na+/K+] ratio even lower than 0.44. This strategy opened a new way to recovery of potassium with a maximum yield of 59.88% from the carbonate-chloride-based brine.
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