JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Yun-Yun Gao,Xiao-Feng Guo,Lan-Rong Zhao,Shi-Hua Sang
The stable phase equilibria of the ternary system MgBr2 + SrBr2 + H2O at 288 and 308 K were studied with the isothermal dissolution equilibrium method. The compositions of solutions and solid phases have been determined and the equilibrium solid phases at the invariant points were identified with the aid of the X-ray diffraction method. The phase diagrams of this system at 288 and 308 K were both constructed in terms of experimental results. Two stable phase diagrams show that this system is hydrate type I at two temperatures without formation of a solid solution or complex salt. Both the phase diagrams are composed of one invariant point, two univariate curves, and two crystallization regions (SrBr2·6H2O and MgBr2·6H2O). The equilibrium solid phases of the invariant point at 288 and 308 K are both SrBr2·6H2O and MgBr2·6H2O, respectively. Combining the Pitzer single-salt parameters of MgBr2 and SrBr2 reported in the literatures, the unreported mixing ion-interaction parameters θMg,Sr and ΨMg,Sr,Br at 288 and 308 K were fitted with the measured values in this study using the Pitzer equations. The agreement between the experimental values and calculated results in the ternary system MgBr2 + SrBr2 + H2O at 288 and 308 K shows that the parameters fitted with solubilities are reliable.
研究领域:
化学
·
物理化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 59
·37063-37066
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IF 3.361
Zhengyang Fan,Jie Chen,Huaming Mao,Jungang Yin,Wei Dai,Linlin He,Hongwei Yang
Synthesis of silver nanowires (Ag NWs) has been studied for decades. However, Ag NWs with diameters below 20 nm synthesised by simple and robust approaches are still rarely reported. In this work, Ag NWs with an average diameter of ∼15 nm and an aspect ratio of over 1000 have been prepared by using a Grignard reagent 5-chloro-2-thienylmagnesium bromide as an assistant additive. In particular, the presence of 5-chloro-2-thienylmagnesium bromide is proven to be beneficial for the in situ formation of smaller AgBr and AgCl particles step by step in comparison with traditional inorganic halide ions, and then promote the final growth of ultrafine Ag NWs.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER INTERNATIONAL
·
2015
·Vol. 64
·期 8
·979-985
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IF 2.409
Lijuan He,Zongbo Zhang,Xiaogan Yang,Lingling Jiao,Yongming Li,Caihong Xu
A series of liquid polycarbosilanes were successfully synthesized by a sequential Grignard coupling reaction of (chloromethyl)triethoxysilane and vinylmagnesium bromide, followed by reduction with lithium aluminium hydride. The use of non-corrosive, easily handleable and storage stable (chloromethyl)triethoxysilane as starting material is an attractive advantage for this route. The as-synthesized polymers containing Si−CH=CH 2 and Si − H groups are storage stable and can be easily cured in an inert atmosphere. The ceramic yield of the cured polycarbosilane and the C:Si ratio of the derived ceramic were varied by adjusting the mole ratio of starting materials in the feed. Among them, the polymer with a mole ratio of Si−CH=CH 2 to Si − H of 1:10 has the highest ceramic yield at 89.6% after curing at 220 °C and the C:Si ratio of the derived ceramic is 1.48. This kind of polycarbosilane shows high potential as an SiC ceramic precursor in the fabrication of an SiC matrix by the precursor infiltration pyrolysis process. © 2015 Society of Chemical Industry
研究领域:
材料科学
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化学工程
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Huiwang Lian,Rongyi Kuang,Meng Gao,Simin Gu,Siran Tao,Yang Li,Jing Wang,Jianxin Shi
The increasing demand for more efficient and stable scintillators in X-ray imaging applications has spurred extensive research on lead-halide perovskites, particularly Cs-Pb-Br systems. Encapsulating 3D CsPbBr 3 in 0D Cs 4 PbBr 6 matrices represents a promising strategy for enhancing luminescence efficiency. However, persistent lead toxicity impedes clinical and industrial translation, while complex exciton dynamics in these heterostructures complicate scintillation optimization. Here, we develop a liquid-solid interface cation exchange (LSICE) strategy to synthesize Zn-alloyed Cs 4 PbBr 6 /CsPbBr 3 (0D/3D) heterostructures, achieving an enhanced scintillation performance with concurrent lead reduction of 60 %. Unmodified 0D/3D perovskites exhibit abundant paramagnetic Pb (III) defect states, which act as hole-trapping centers, impairing energy transfer from the 0D to 3D phase and causing delayed fluorescence, severe nonradiative recombination, persistent afterglow, and a low scintillation yield of 7423 photons/MeV. In contrast, Zn-alloyed 0D/3D perovskites substantially suppress Pb (III) defects, enabling efficient energy transfer, low afterglow emission, and accelerated excitonic radiative recombination. The optimized scintillator exhibits exceptional performance metrics, achieving a light yield of 13,326 photons/MeV, a spatial resolution of 10.3 lp/mm, and an ultra-low radiation detection limit of 22 nGy air /s. This work addresses the toxicity-performance trade-off in perovskites and establishes B-site alloying as a universal paradigm for designing eco-friendly, high-efficiency radiation detectors.
研究领域:
材料科学
·
光电子学
·
辐射探测
·
纳米材料
·
钙钛矿化学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2026
·
IF 6.3
Yaqi Liu,Yun Ju,Hong Zhang,Jing He,Jie Jiang,Jing Zhao,Mingyi Wang
Sea spray aerosol (SSA) contains abundant anions, which significantly impact CO 2 fixation at the air-water interface in atmospheric microdroplets. However, the underlying molecular mechanism remains unclear. Herein, we simulated SSA using nebulized saltwater microdroplets and investigated the common SSA anions (Cl − , Br − , I − , and SO 4 2− ) intervening in the abiotic carboxylation of succinate with CO 2 at the interface. The combination of online and offline analyses revealed that the SSA anions inhibited the interfacial carboxylation of succinate, with an inhibitory effect inversely proportional to their concentration. Kinetic studies confirmed that the carboxylation reaction occurred at a relatively high rate in the presence of the SSA anions. Furthermore, a mechanistic investigation was performed, which showed that SSA anions inhibited the interfacial carboxylation of succinate by modulating the interfacial electric field. Additionally, the formation of adducts between halogen anions from SSA and succinate suggests a potential pathway for the accumulation of succinate in the early marine environment. This work advances our understanding of air-water interfacial chemistry and provides new insights into prebiotic chemistry in the marine atmosphere.
✓ 已验证
产品关联
DOI
高影响因子
OPTICS COMMUNICATIONS
·
2024
·
IF 2.2
QianRu Ma,Yi Ma,ZeShuai Ren,Lin Chen
A terahertz plasmonic metasensor is demonstrated for simultaneous measurement of relative humidity (RH) and temperature at the first time. Double golden rings can excite electromagnetic induced transparency (EIT) with dual plasmonic resonances. By studying the relationship between resonance frequencies at both resonance dips and environmental parameters, the RH sensitivities are 0.14 GHz/% (−282 nm/%) at low frequency (dip A) and 0.27 GHz/% (−210 nm/%) at high frequency (dip C), while the temperature sensitivities are 1.35 GHz/°C (−2718 nm/°C) at dip A and 2.45 GHz/°C (−1906 nm/°C) at dip C. Additionally, the influences of temperature and RH are proven independent on frequency shifts, indicating a suitability with RH and temperature changes simultaneously. The proposed metasenor covers advantages of polarization-incident insensitivity, high sensitivity, easy integration and low cost, making wide applications in industrial manufacturing, clinical medicine, weather forecasting and human health.
研究领域:
传感器技术
·
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2020
·
IF 16.602
Yudi Wang,Xiya Yang,Xueping Yu,Jialong Duan,Qianming Yang,Yanyan Duan,Qunwei Tang
The in-depth understanding on the electrification behavior of dielectric materials is a prerequisite to improve their surface triboelectric charge density in triboelectric nanogenerators (TENGs). Herein, triboelectric charging affinities and polarities of all-inorganic cesium lead tri-bromine (CsPbBr 3 ) and alkaline earth ions doped CsPb 1- x M x Br 3 (M = Mg 2+ , Ca 2+ , Sr 2+ , Ba 2+ , x = 0–1) perovskites are systematically investigated by assembling into vertical contact-separation TENGs. An enriched triboelectric series supplemented with pristine CsPbBr 3 and CsPb 1- x M x Br 3 perovskites with quantified triboelectric charging polarity is presented through analyzing the electrical output performances, figure-of-merits (FOM), dielectric property , work function, bond energy and electron binding energy. Systematical analyses of three different configurations of dielectric/perovskite TENG, carbon/perovskite TENG and perovskite solar cell are compared in dark and under illumination. It is found that the photoinduced charges play significant role in enhancing the triboelectrification charges and altering charging polarity of perovskite. Our work supplements inorganic perovskites to triboelectric series and provides new insights on inorganic perovskite in the foundation of tribo-photovoltaic theory and triboelectric devices.
研究领域:
材料科学
·
能源技术
·
纳米科技
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Yan Ouyang,Yanpeng Guo,Dian Li,Yaqing Wei,Tianyou Zhai,Huiqiao Li
The dendritic lithium formation and sustained lithium consumption caused by the uncontrollable side reactions between lithium and electrolytes seriously restrict the applications of lithium anodes in high-energy density batteries, especially in carbonate electrolytes. Ameliorating the surface status of lithium anodes is critical for modulating lithium deposition behavior and improving the cycling stability of lithium metal batteries. Herein, magnesium chloride salt is first reported as a carbonate electrolyte additive for lithium surface modification by in situ reaction. It is proved that both Cl– and Mg2+ play important roles in building a stable electrode/electrolyte interface with a fast Li+ diffusion property. The coexistence of inorganic LiCl and metallic Mg species in the interface can effectively decrease the surface side reactions, lower interphase resistance, promote Li ions diffusion, and result in uniform lithium deposition. The electrochemical tests show that the reversible utilization rate of lithium for Li/Cu asymmetrical cells increases by 10% and the polarization of Li/Li symmetrical cells is reduced noteworthily with such an additive. Furthermore, a significant improved cycling performance of Li/Li4T5O12 full cells is also achieved.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Chemistry
·
2023
·
IF 5.5
Cui Ruizhi,Peng Changwei,Nie Guoliang,Sang Shihua,Ren Hongbao,Li Wu
In view of the composition characteristics of lithium, calcium and bromine rich in Nanyishan oil and gas field brine of western Qaidam Basin, Qinghai Province, as well as based on the results reported in relevant literature, the phase equilibrium relationship of ternary system LiBr-CaBr2-H2O at 298.15 K was studied by isothermal dissolution equilibrium method. The equilibrium solid phase crystallization regions, as well as the compositions of invariant point, in phase diagram of this ternary system were clarified. On basis of the above ternary system research, the stable phase equilibria of quaternary systems (LiBr-NaBr-CaBr2-H2O, LiBr-KBr-CaBr2-H2O and LiBr-MgBr2-CaBr2-H2O), as well as quinary systems (LiBr-NaBr-KBr-CaBr2-H2O, LiBr-NaBr-MgBr2-CaBr2-H2O and LiBr-KBr-MgBr2-CaBr2-H2O) were further carried out at 298.15 K. According to the above experimental results, the corresponding phase diagrams at 298.15 K were drawn, which revealed the phase relationship of each component in solution and the law of crystallization and dissolution, and meanwhile summarized changing trends. The research results of this paper lay a foundation for further research on the multitemperature phase equilibria and thermodynamic properties of lithium and bromine containing high-component brine system in later stage, and also provide basic thermodynamic data for guiding the comprehensive development and utilization of this oil and gas field brine resource.
研究领域:
化学
·
热力学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 13
·5021
·
IF 4.6
Xinlan Han,Jinhua Li,Siyu Tao,Guowei Dou,Sanawar Mansur,Xinqian Zhang
The specific structure and diverse properties of hybrid organic–inorganic perovskite materials make them suitable for use in photovoltaic and sensing fields. In this study, environmentally stable organic–inorganic hybrid perovskite luminescent materials using Pb–MOF as a particular lead source were prepared using a mechanochemical method. Based on the fluorescence intensity of the MAPbBr3/MOF composite, the mechanized chemical preparation conditions of Pb–MOF were optimized using response surface methodology. Then, the morphological characteristics of the MAPbBr3/MOF composite at different stages were analyzed using electron microscopy to explore its transformation and growth process. Furthermore, the composite form of MAPbBr3with Pb–MOF was studied using XRD and XPS, and the approximate content of MAPbBr3in the composite material was calculated. Benefiting from the increase in reaction sites generated from the crush of Pb–MOF during mechanical grinding, more MAPbBr3was generated with a particle size of approximately 5.2 nm, although the morphology of the composite was significantly different from the initial Pb–MOF. Optimal performance of MAPbBr3/MOF was obtained from Pb–MOF prepared under solvent-free conditions, with a milling time of 30 min, milling frequency of 30 Hz and ball–material of 35:1. It was also confirmed that the mechanochemical method had a good universality in preparing organic–inorganic hybrid perovskite/MOF composites.Keywords:Pb–MOF;organic–inorganic hybrid perovskite/MOF composites;mechanochemical method;optical properties
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Chemical Science
·
2023
·Vol. 14
·期 33
·8914-8923
·
IF 8.4
Keqiang Chen,Zixin Gu,Zhiqing Wang,Mengyu Guan,Xiu Tan,Wanqing Xu,Xinyu Ji,Weiqi Lu,Yueli Liu,Guogang Li
Recently, the polarization effect has been receiving tremendous attention, as it can result in improved stability and charge transfer efficiency of metal-halide perovskites (MHPs). However, realizing the polarization effect on CsPbX3 NCs still remains a challenge. Here, metal ions with small radii (such as Mg2+, Li+, Ni2+, etc.) are introduced on the surface of CsPbX3 NCs, which facilitate the arising of electric dipole and surface polarization. The surface polarization effect promotes redistribution of the surface electron density, leading to reinforced surface ligand bonding, reduced surface defects, near unity photoluminescence quantum yields (PLQYs), and enhanced stability. Moreover, further introduction of hydroiodic acid results in the in situ formation of tert-butyl iodide (TBI), which facilitates the successful synthesis of pure iodine-based CsPbI3 NCs with high PLQY (95.3%) and stability under ambient conditions. The results of this work provide sufficient evidence to exhibit the crucial role of the surface polarization effect, which promotes the synthesis of high-quality MHPs and their applications in the fields of optoelectronic devices.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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