CHEMISTRY OF MATERIALS
·
2023
·
IF 8.6
Kai Zhang,Pan Xue,Jianghua Wu,Liyun Wu,Nanyang Wang,Tao Xu,Kaiping Zhu,Jun Pu,Qiulong Li,Yu Deng,Yagang Yao,Jin Zhang
Compared to other synthetic methods, the synthesis of boron nitride nanotubes (BNNTs) by the boron oxide chemical vapor deposition (BOCVD) method can balance the purity and quality of the product nanotubes. However, due to the solid reaction characteristics of boron monomers, the closed reaction system, and the synthesis temperature of over 1000 °C, growth studies of BNNTs have been in a dilemma. To this end, simultaneous thermal analysis combined with multi-atmosphere annealing experiments at corresponding temperatures is used to study the inorganic solid-state reaction of the classical BOCVD precursor B/Li2O in real time and confirmed by experimental results that lithium borate is the actual active component and catalyst. Further experiments reveal that the growth process of BNNTs and lithium borate not only consumes less of the precursor and ammonia but is also flexible in its configuration, showing exceptional efficiency and reactivity. Lastly, experiments have shown that the structure and activity of borate are equally applicable to alkali metals, alkaline earth metal, and transition metals.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Tao Zhang,Liwei Zhuang,Dan Li,Lingzong Meng,Tianlong Deng,Yafei Guo,Yong Ma
The solubilities of salts, refractive indices, and pH values of the equilibrium liquid phases in the quaternary system LiCl–LiBO2–Li2B4O7–H2O at 323.15 K were investigated by the isothermal dissolution method for the first time. The dry-salt diagram of the quaternary system consisted of one invariant point, three univariant curves and three crystallization fields corresponding to LiCl·H2O, LiBO2·2H2O, and Li2B4O7·3H2O. The solution refractive indices and pH values change regularly with the changing of concentration. Combining the equilibrium constants for different boron species, the distributions of six boron species in the mixed solution in the systems LiCl–LiBO2–H2O, LiBO2–Li2B4O7–H2O, and LiCl–Li2B4O7–LiBO2–H2O were calculated with the total boron concentration and pH values. The main boron species in the mixed solution of the quaternary system are B3O3(OH)4–, B4O5(OH)42–, B(OH)3, and B5O6(OH)4–. The boron species distributions are mainly affected by the pH values and the concentration of total boron and LiCl in the solution. The results of phase diagram and boron species distribution in the quaternary system can supply foundation data for separating lithium borate from brines.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Xiaoman Shi,Huimin Li,Ran Pang,Mekhrdod S. Kurboniyon,Lihong Jiang,Da Li,Su Zhang,Hongjie Zhang
Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) can enable material identification by leveraging the absorption differences of specific functional groups (e.g., C-H and O-H) in the NIR region. The basic requirement for organics detection of NIR pc-LEDs is broadband emission that covers the strong absorption range of the functional groups. This work reports a new double perovskite matrix Cr 3+ -doped BaLaMgTaO 6 (BLMTO:Cr 3+ ) with 800 nm - 1200 nm broadband NIR emission upon 467 nm excitation, effectively covering the absorption regions of C-H and O-H bonds. Utilizing the first-principles calculations, crystal field theory and a variety of characterization methods, the spectral properties, the site occupancy of Cr 3+ and the temperature and concentration dependent spectra are fully demonstrated. Notably, by introducing Li + as a charge compensator, the spectra emission intensity increased to 1.67 times and the QY enhanced to 1.36 times. It is speculated that the intervention of Li + may make the charge balance after 2Cr 3+ → Mg 2+ + Ta 5+ substitution and form a more stable lattice environment. Finally, the NIR pc-LEDs assembled with BLMTO:Cr 3+ , Li + enables multi-applications in organic solution detection, biological imaging and night vision, paving the way for the development and application of multifunctional NIR pc-LEDs.
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FLUID PHASE EQUILIBRIA
·
2020
·
IF 2.838
Lan Yang,Lele Chen,Tao Zhang,Dan Li,Lingzong Meng,Tianlong Deng,Yafei Guo
The solubilities and the refractive indices in the ternary system LiBO 2 −Li 2 B 4 O 7 −H 2 O at 298.15 K and 323.15 K were determined with the isothermal dissolution method. The phase diagrams and refractive index diagrams were drawn with the experimental values. The phase diagrams at 298.15 K and 323.15 K consist of one invariant point, two univariant curves and two crystallization regions corresponding to Li 2 B 4 O 7 ·3H 2 O, LiBO 2 ·8H 2 O (at 298.15 K) and LiBO 2 ·2H 2 O (at 323.15 K). Based on the Pitzer model, the mixing ion-interaction parameters ( θ B ( O H ) 4 − , B 4 O 5 ( OH ) 4 2 − and Ψ L i + , B ( O H ) 4 − , B 4 O 5 ( O H ) 4 2 − ) at 298.15 K and 323.15 K were fitted with the solubility data. A comparison shows that the calculated solubilities in the ternary system at 298.15 and 323.15 K agree well with the experimental data. The phase diagram and Pitzer model for the ternary system were then used to conduct isothermal evaporation simulation. Different salt will be obtained if the original solution point in different unsaturated regions.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Dazhao Wang,Jianbei Qiu,Dacheng Zhou,Songhan Hu,Yugeng Wen,Ke Zhang,Qi Wang,Yong Yang,Hao Wu,Zhangwen Long,Xizheng Li,Jiacheng Pi,Enhao Cao
All-inorganic CsPbBr 3 nanocrystal (NC) has been extensively studied because of its excellent optical properties . However, its poor stability restricts further practical applications. Glass as a carrier can solve this problem well while still maintaining excellent luminescent properties. The traditional CsPbBr 3 NC glass is obtained by melt-quenching and heat treatment. In this paper, we first propose LiBr-induced the self-crystallization of CsPbBr 3 NC in borosilicate glass without heat treatment. We demonstrated that the lithium changes the glass network structure, resulting in a higher aggregation state in the glass. At the same time, the lithium doping increases the degree of phase separation of the glass. Both of these two factors benefit the formation of the CsPbBr 3 NC. The self-crystallized CsPBbr 3 NC glass has better luminescent properties than NC glass obtained by heat treatment. What is more, the self-crystallized CsPbBr 3 NC glass shows good environmental and water stability, especially thermal stability. We combined blue and red phosphors to construct a white light-emitting diode (WLED), which has excellent application prospects. Our work paves a new path for the research of perovskite nanocrystals, and provides promising development for future optoelectronic applications.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Lan Yang,Lingzong Meng,Tongjie Ge,Dan Li,Tianlong Deng,Yafei Guo
The solubilities in the MCl–M2B4O7–H2O (M = Li, Na) systems at 323.15 K were studied with the isothermal solid–liquid equilibrium method. Both the phase diagrams in the above systems belong to the simple eutectic type. Combining the Pitzer binary parameters of LiCl and NaCl obtained from the literatures, the lacking Pitzer binary parameters of Li2B4O5(OH)4 and Na2B4O5(OH)4, Pitzer mixing parameters θCl–,B4O5(OH)42–, ψLi+,Cl–,B4O5(OH)42–, and ψNa+,Cl–,B4O5(OH)42–, and the solubility product constants of Li2B4O5(OH)4·H2O and Na2B4O5(OH)4·8H2O at 298.15 and 323.15 K were fitted with the experimental solubility data by the Pitzer model. The agreement between the experimental water activities and calculated results with parameters fitted with solubilities in the system LiCl–Li2B4O7–H2O at 298.15 K shows that the parameters fitted with solubilities are reliable. The comparison between the experimental and calculated solubilities of the two systems at 298.15 and 323.15 K shows that calculated solubility data are in agreement with 0.03 of experimental results in the two systems.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2016
·Vol. 99
·期 4
·1151-1154
·
IF 2.787
Jun Qu,Xuewei Li,Zhiwu Lei,Zhao Li,Min Chen,Qiwu Zhang
Tetraborate pillared Li–Al layered double hydroxide was synthesized for the first time by a mechano-hydrothermal process in which gibbsite (Al(OH) 3 ) sample was first activated by a ball milling, followed by hydrothermal treatment with Li 2 B 4 O 7 in water at 95°C. Activation of gibbsite Al(OH) 3 induced by mechanochemical process was essential for the formation of thin disk-like Li–Al LDH intercalated with borate anion. When in excess the activated Al(OH) 3 was transformed into bayerite phase during the hydrothermal process.
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Reaction Kinetics Mechanisms and Catalysis
·
2018
·Vol. 124
·期 2
·683-699
·
IF 1.515
Zhu Min,Chen Changlin
A series of Pt–yLi 2 B 4 O 7 /WO x /ZrO 2 (y = 0, 0.5, 1, 2 wt%) catalysts were prepared by varying the content of Li 2 B 4 O 7 through the method of coimpregnation-calcination. The obtained catalysts were used for the selective hydrogenolysis of glycerol to 1,3-propanediol. Meanwhile, these catalysts were characterized by N 2 adsorption and desorption (BET), CO chemisorption, X-ray diffraction (XRD), NH 3 -temperature programmed desorption (NH 3 -TPD), H 2 -temperature programmed reduction (H 2 -TPR), Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). The results showed that Pt–1Li 2 B 4 O 7 /WO x /ZrO 2 achieved the highest activity with glycerol conversion of 90.7% at 150 °C and 4 MPa and exhibited excellent stability over 200 h. Pt/WO x /ZrO 2 catalyst modified with Li 2 B 4 O 7 was able to enhance catalytic activity and stability, since Li 2 B 4 O 7 promoted the dispersion of Pt, increased the acid amount of the catalyst and strengthened the interaction between active components and support.
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Materials Science & Engineering C-Materials for Biological Applications
·
2018
·
IF 5.08
Yada Li,Weiqiang Wang,Huiying Liu,Jingwu Lei,Jingying Zhang,Hongzhi Zhou,Min Qi
A novel “cortex-like” micro/nano dual-scale structured TiO 2 coating was prepared on a titanium surface by micro-arc oxidation (MAO) with tetraborate electrolytes. This structure, which combines microslots with nanopores, exhibits super hydrophilicity. This coating modified the surface structure, chemistry, and hydrophilicity in a one-step treatment. Evolution of the coating together with its surface and structure properties was studied. We propose a forming mechanism of the dual-scale structure in which the oxides formed during the MAO discharge dissolve in the tetraborate electrolytes, leaving little or no deposition outside the discharge channels. We performed in vitro tests using human bone marrow-derived mesenchymal stem cells (hBMSCs) that compared this coating with a “volcano-like” MAO coating and a commercial sandblasted, large-grit and acid-etched (SLA) coating. The adhesion, morphology, proliferation, and differentiation of hBMSCs, together with the matrix mineralization, were investigated. Results suggest that the “cortex-like” structure significantly promotes the adhesion, spreading, and differentiation of cells and increases the matrix mineralization. In vivo tests with mongrel dogs showed an excellent osseointegration of the “cortex-like” coating. The combination of the dual-scale structure and the hydrophilicity of the “cortex-like” TiO 2 coating synergistically resulted in an outstanding cytocompatibility and osseointegration, which may facilitate a higher level of implant success.
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PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2025
·
IF 2.1
Hongyu Qi,Jiaxin Han,Lin Xing,Jia Xu,Yushan Liu,Xun Wang,Tao Zhang,Yong Ma,Lingzong Meng
The phase equilibrium of the quinary system LiCl–Li2SO4–LiBO2–Li2B4O7–H2O at 323.15 K was studied with an isothermal dissolution method. The dry-salt phase diagram of the quinary system consists of one invariant point saturated with LiCl·H2O, Li2B4O7·3H2O, and LiBO2·2H2O, three univariant curves, and three crystallization regions saturated with Li2SO4·H2O corresponding to LiCl·H2O, Li2B4O7·3H2O, and LiBO2·2H2O. The J(H2O), J(Li2SO4), refractive index, and pH value change gradually with the changing concentration. Combining the equilibrium constants for boron-containing species, the pH values, and concentration of total boron, the boron-containing species distributions in the mixed solution in the system were calculated. The concentrations of B3O3(OH)52– and B5O6(OH)4– are very low and can be neglected. The boron-containing species distributions are mainly affected by m(LiCl) in the solution but less by m(Li2SO4). The results of the phase diagram and boron-containing species distribution in the quinary system can provide fundamental thermodynamic data for the extraction of lithium borate from brines.
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高影响因子
危险品化学品经营许可证（带存储）