Russian Journal of Physical Chemistry A
·
2023
·Vol. 97
·期 7
·1368-1375
·
IF 0.7
Zhang Xueping,Liu Youquan,Zhou Lang,Pu Junhong
Abstract In this work, the isothermal dissolution equilibrium method was used to investigate the solid-liquid equilibrium of the quaternary system NaBr–KBr–CaBr 2 –H 2 O at 273.15 K. The isothermal solubility of three bromides in aqueous solution was measured, and the dry salt phase diagram and water diagram were constructed. The determination results indicate that the system is a simple co-saturation type, and the equilibrium crystals are all simple salts. The isothermal phase diagram of the quaternary system NaBr–KBr–CaBr 2 –H 2 O at 273.15 K contains three isothermal dissolution lines intersecting at an invariant point. The saturated salts at this point are: NaBr⋅2H 2 O, KBr, and CaBr 2 ⋅6H 2 O. The entire phase space of the dry salt phase diagram is divided into three parts by three isotherms, that is, the crystalline region of NaBr⋅2H 2 O that occupies most, the larger crystalline region of KBr and the narrow crystalline region of CaBr 2 ⋅6H 2 O. The invariant point characteristics of the system at different temperatures were compared, and the Pitzer model was used to theoretically predict the isothermal solubility of the quaternary system at 273.15 K. Since the selected parameters in the calculation program come from the temperature correlation equation reported in the literature, the reliability of the parameters is relatively strong. The predicted value of solubility has a small deviation from the experimental value, and the result proves that the reliability of the experimental data is strong. The results of the phase equilibrium study not only reveal the dissolution and crystallization rules of bromine salts in the brine of oil and gas fields in the Sichuan Basin, but also verify the applicability of the Pitzer model in predicting the solubility of low-temperature bromine-containing system.
研究领域:
化学工程
·
物理化学
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高影响因子
Water
·
2025
·Vol. 17
·期 19
·
IF 3
Trung-Kien Pham,Quynh-Trang Thi Hoang,Cham-Anh Thi Le,Thi-Huyen Tran,Koemhong Bun,Ngoc-Tuyet Thi Le,Van-Son Ho,Van-Hieu Ngo,Quang-Duyen Le,Madina Naukanova
Water shortage has been a serious issue for many years. Hydrate-based desalination (HBD) technology is a potential candidate for this solution. The present study investigates the use of Cyclopentane (CP) as a hydrate former for desalination through crystallization at low temperatures and atmospheric pressure. The primary objective of this work is to provide phase equilibrium data for CP hydrates (CPH) in the presence of novel salt systems, including NaBr, KBr, K2SO4, NaBr–KBr, NaCl–NaBr, KCl–KBr, Na2SO4–K2SO4, and CaCl2–MgCl2. Phase equilibrium temperatures were determined using both rapid and slow dissociation procedures. The van der Waals and Platteeuw-based Kihara (Kihara) approach, Hu-Lee-Sum (HLS) correlation, Standard Freezing Point Depression (SFPD) approach, and Activity-Based Occupancy Correlation (ABOC) were applied to model these new experimental data. The experimental results demonstrate that the differences between the quick and slow procedure data range from 0 °C to 1.2 °C. In addition, the increasing salt concentration enhances the inhibitory effect on hydrate formation. Furthermore, the influence of cations on the equilibrium temperature follows the decreasing order of Mg2+> Ca2+> Na+> K+. In terms of halide anions, Br−exhibits a stronger impact on equilibrium temperature compared to Cl−. The thermodynamic modeling results (for all four models) show good agreement with the experimental data with the average absolute deviation (AAD) of less than or equal to 0.79 °C. The ABOC approach proves to be the most effective among the four methods evaluated for accurately reproducing the equilibrium temperature of CPH, with AAD less than or equal to 0.38 °C.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Guo-Liang Nie,Rui-Zhi Cui,Wu Li
According to the composition characteristics of lithium, potassium, bromine, and other resources rich in the salt lake brine of the Qinghai–Tibet Plateau, the phase equilibria of the quaternary system LiBr-NaBr-KBr-H2O and its ternary subsystem LiBr-KBr-H2O at 323.15 K are studied by an isothermal dissolution equilibrium method. The solubility of each system in equilibrium solution at the corresponding temperature is measured, and the corresponding phase diagrams are drawn according to the phase equilibrium experimental data. The results show that there is no complex salt or solid solution in the ternary system LiBr-KBr-H2O at 323.15 K. The phase diagram contains one invariant point (E1), two univariate curves (AE1 and BE1), and two equilibrium solid crystallization regions (corresponding to LiBr·H2O and KBr), belonging to the simple cosaturated type. The quaternary system LiBr-NaBr-KBr-H2O also has no formation of complex salt and solid solution. The phase diagram contains two invariant points (F1 and F2), five univariate curves (E1F1, E3F1, F1F2, E2F2, and E4F2), and four equilibrium solid-phase crystallization regions (corresponding to LiBr·H2O, KBr, NaBr·2H2O, and NaBr). At the same time, to further explain the phase equilibrium relationship of each system at different temperatures and the change rule of each component, comparison and discussion are carried out.
研究领域:
化学工程
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材料科学
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高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2017
·Vol. 24
·期 1
·16-24
·
IF 0
Sun Jinsheng,Wei Dongmei,Lv Hao
This study focuses on shape-controlled synthesis of gold nanoparticles, using the green reducing agent l -Tryptophan ( l -Trp), which is non-toxic and eco-friendly. This specific agent was investigated to realize certain morphology controlling effects by changing the relative growth rates among various crystal planes. Experimental samples were characterized by transmission electron microscope, UV–Vis spectrophotometer and X-ray diffraction (XRD) for size and morphological information. The effects of the specific additives of PVP ((C 6 H 9 NO)
n
), CTAB (C 16 H 33 (CH 3 ) 3 NBr), and KBr were examined for their morphological control individually and synergistically in this system. Hexagonal gold nanoparticles were successfully obtained via the PVP/CTAB and PVP/KBr systems. Particular amounts of PVP/KBr produced various polyhedron structures, such as cubes, and others with triangular and rhombic straight-side cross sections.
研究领域:
材料科学
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纳米生物学
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环境科学
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DOI
INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Jiayi Li,Hengtong Zhang,Hongcai Yang,Shudong Lin
Silver nanowires (AgNWs) exhibit excellent electrical conductivity and hold significant potential for usage in flexible electronics. AgNs can possess a suitable aspect ratio, uniformity, and flexibility that are essential for achieving high-performance flexible transparent conductive films. However, the synthesis of AgNWs presents a challenge in controlling its morphology, often resulting in varying lengths and aspect ratios that are difficult to regulate. Thus, the controlled preparation of AgNWs holds great significance. Herein, AgNWs were synthesized via a polyol method with FeCl 3 and KBr composite metal salt as control agents, silver nitrate as a silver source, ethylene glycol as a reducing agent and solvent, and polyvinylpyrrolidone (PVP) as a growth director. By adjusting the ratio and dosage of FeCl 3 and KBr, the morphology controllability of AgNWs was realized, and the obtained AgNWs can be straight or bendable. The surface morphology and microstructure of the AgNWs were analyzed by scanning electron microscopy (SEM). Due to the synergistic effect of FeCl 3 and KBr, flexible AgNWs with an average diameter of 25–35 nm, an average length of 35–45 um, and an aspect ratio of over 1000 can be obtained. Mechanism studies have shown that through electrostatic interactions, AgCl, AgBr, NO 3 − , and PVP in the reaction mixture can form binding sites for AgCl-PVP-NO 3 − and AgBr-PVP-NO 3 − , thus causing the silver nanowires to become flexible. Meanwhile, the strong polarization effect caused by Br − in the reaction causes the chain growth to become subject to the dual effects of electrostatic repulsion and external forces, resulting in the formation of flexible and soft silver nanowires.
研究领域:
材料科学
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纳米技术
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高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 9
·期 9
·1879-1889
·
IF 6.569
Xiao-Kai Gong,Xiao-Song Zhang,Lan Li,Jian-Ping Xu,Ru-Kun Ding,Hao Yin,Zhao-Wei Zhang,Qian Li,Long Liu
With the addition of Na+ and Bi3+ to the lead-free double perovskite Cs2AgInCl6, high photoluminescence quantum yields (PLQYs) can be achieved, making Cs2AgInCl6 more promising; however, it is still difficult to achieve blue-light-excited narrowing emission. In this study, Cs2−xKxAg0.6Na0.4In0.8Bi0.2Cl6−xBrx was developed with K+ and Br−, realizing blue-light-excited narrowing red photoluminescence under cryogenic temperatures. The transitional non-localized donor energy level was formed by KBr addition, changing the exciton excitation and transition process. With the increase in the x value, Cs2−xKxAg0.6Na0.4In0.8Bi0.2Cl6−xBrx can be excited by blue light at 150 K and emit a narrowing red light. When 1 : 1 KBr was added, the full width at half maximum (FWHM) of Cs2−xKxAg0.6Na0.4In0.8Bi0.2Cl6−xBrx red light emission was further narrowed to only 73 nm, when excited by 467 nm blue light at 10 K. This study will stimulate further research on lead-free double perovskites in the field of display technologies.
研究领域:
材料科学
·
光学
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DOI
高影响因子
MOLECULES
·
2020
·Vol. 25
·期 4
·914
·
IF 3.267
Ligeng Wang,Chun Feng,Yan Zhang,Jun Hu
The regioselective mono-bromination of phenols has been successfully developed with KBr and ZnAl–BrO3−–layered double hydroxides (abbreviated as ZnAl–BrO3−–LDHs) as brominating reagents. The para site is much favorable and the ortho site takes the priority if para site is occupied. This reaction featured with excellent regioselectivity, cheap brominating reagents, mild reaction condition, high atom economy, broad substrate scope, and provided an efficient method to synthesize bromophenols.Keywords:phenol;bromination;regioselecitvity
研究领域:
有机化学
·
材料化学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 12
·4485-4489
·
IF 8.262
Wei Hong,Peiyan Bi,Changshuai Shang,Jin Wang,Erkang Wang
A simple one-pot synthesis of multi-walled carbon nanotube supported Pd nanocubes is described in this work. Pd nanocubes were in situ grown on carbon nanotubes. The Pd nanocubes show a single-crystal nanostructure and an average diameter of about 9.6 nm. The use of KBr is essential for the formation of Pd nanocubes; without KBr, only irregular Pd nanoparticles can be generated. The structural properties and electronic states of the prepared Pd nanocubes were studied by transmission electron microscopy and X-ray photoelectron spectroscopy, respectively. The developed nanomaterials present enhanced electrocatalytic activity which is 1.3 times and 1.75 times higher than that of their counterpart multi-walled carbon nanotube supported Pd nanoparticles and a commercial Pd/C reagent, respectively, for formic acid electrooxidation.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xin Tong,Hongquan Yu,Xiangping Li,Sai Xu,Baojiu Chen
Owing to their environmental friendliness, structural tunability, and ability to emit self-trapped excitons, lead-free halide double perovskites (DPs) have demonstrated significant potential for applications in light-emitting diodes (LEDs) and photodetectors. However, their chemical and thermal stability is generally insufficient. These limitations hinder their practical application in LEDs, as these devices typically generate considerable heat under high operating currents and prolonged usage, particularly in the case of infrared LEDs. In this work, Er 3+ -doped double perovskites (Cs 2 NaYCl 6 and the Cs 2 NaYCl 6 @0.6 KBr composite) were synthesized via a hydrothermal method. The emission intensity of Cs 2 NaYCl 6 :2 % Er 3+ @0.6 KBr is five times greater than that of Cs 2 NaYCl 6 :2 % Er 3+ within the wavelength range of 1400–1600 nm. In the Cs 2 NaYCl 6 :Er 3+ @0.6 KBr composite, the surface defects of Cs 2 NaYCl 6 :Er 3+ were modified by the introduction of KBr, leading to an increase in the external quantum efficiency (EQE) of Cs 2 NaYCl 6 :Er 3+ from 9.5 % to 30.0 %. Under a 150 mA working current, the operating temperatures of the near-infrared (NIR) LED devices based on the Cs 2 NaYCl 6 :2 %Er 3+ and Cs 2 NaYCl 6 :2 %Er 3+ @0.6 KBr composite are 53.2 and 47.4 °C, respectively. After working for 2 h, the temperatures of the NIR LEDs based on Cs 2 NaYCl 6 :2 %Er 3+ and Cs 2 NaYCl 6 :2 %Er 3+ @0.6 KBr were 60.3 °C and 46.0 °C, respectively, under a 100 mA operating current.
研究领域:
材料科学
·
光学工程
·
固态照明技术
·
稀土发光材料
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高影响因子
Optical Materials Express
·
2022
·Vol. 12
·期 4
·1708-1716
·
IF 3.074
Yaning Luo,Yaning Luo,Lingmei Kong,Lingmei Kong,Lin Wang,Lin Wang,Shuanghe Guo,Xuyong Yang,Xuyong Yang
Perovskite light-emitting diodes (PeLEDs) are regarded as exceptional candidates for next-generation high-definition displays. Despite the fact that the all-inorganic perovskites possess an advantage in structural stability among the perovskite family, the electroluminescence (EL) performance of their corresponding PeLEDs are still challenged by the difficulties in depositing smooth, uniform perovskite films and realizing chare balance under working voltages. Here, we report an efficient and stable CsPbBr3 based PeLED, which is enabled by a hole transport layer (HTL) of KBr doped poly(3,4,-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS). The KBr dopant can not only improve the charge balance by boosting the hole injection, but also suppress the exciton quenching through passivating halide defects in perovskites. The resulting PeLED exhibits a maximum current efficiency (CE) of 35.09 cd A−1 and a maximum external quantum efficiency (EQE) of 10.02%, which are over 12-fold higher than those of the control device based on undoped HTL, respectively. Our work provides an easy and efficient strategy to boost the EL performance of all-inorganic perovskites.
研究领域:
材料科学
·
光电子学
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高影响因子
Journal of Physical Chemistry C
·
2025
·
IF 3.2
Youtong Liu,Linlin Guan,Fang Zhao,Yuhan Jiang,Lingmu Zeng,Luwei Yang,Xiaobin Luo,Yang Ren,Xiaowei Zhou,Zhu Liu
All-inorganic CsPbBr3 perovskite films (band gap: 2.33 eV) were fabricated via a two-step electrochemical deposition (ECD) approach with controlled alkali halide codoping (KBr/KCl). Structural and morphological analyses (X-ray diffraction (XRD) and field-emission scanning electron microscopy (FE-SEM)) show that 0.5 mg/mL KBr doping suppresses CsPb2Br5 formation, refines the grain size, and smooths film surfaces, reducing the charge-transfer resistance and extending the carrier lifetime from 3 to 8.3 ns. Compared to the undoped control, these changes deliver more than a 2-fold improvement in power conversion efficiency (PCE), driven by enhanced short-circuit current (JSC) and open-circuit voltage (VOC). KCl doping at 0.3 mg/mL concentration reduces the defect density by about 23% and yields 50% efficiency improvement. These findings show that targeted doping during electrochemical deposition can tune defect-phase interactions in CsPbBr3 perovskite and offers a scalable way to optimize its device performance.
研究领域:
材料科学
·
光伏技术
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半导体器件
·
纳米技术
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DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 25
·9385-9391
·
IF 5.7
Yue Zhai,Kecheng Dai,Tongtong Xuan,Wenhao Bai,Shuchen Shi,Hong Zhang,Rongjun Xie,Le Wang
All-inorganic cesium lead halide perovskite materials have potential applications in mini/micro-LED display applications due to their excellent photoelectric properties. However, these materials have an uncontrollable tendency to form large-sized crystals and poor stability, which is not conducive to miniaturized optoelectronic applications. Herein, a novel Cs4PbBr6@KBr color conversion film (Cs4PbBr6@KBr CCFs) with both excellent luminescence properties and high stability was in situ constructed by using inkjet printing technology. The improvement in performance is attributed to the reduction in perovskite defects within the structure and the isolation of oxygen and water by the surface modification layer, which is related to the higher solubility product of KBr. The Cs4PbBr6@KBr CCFs printed on a PET flexible substrate present a high-resolution dot matrix of 16.7 μm and a homogeneous and bright green emission with a high photoluminescence quantum yield of 94%. Moreover, the Cs4PbBr6@KBr CCFs retain 65% of their initial intensity after being aged at 70 °C for 16 h, which is superior to that of perovskite CCFs without the coating of KBr. These results indicate that the Cs4PbBr6@KBr composite has excellent potential in realizing mini/micro-LED displays with high resolution and anti-counterfeiting lables.
研究领域:
材料科学
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光电子学
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显示技术
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纳米技术
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高影响因子
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