JOURNAL OF CHEMICAL THERMODYNAMICS
·
2022
·
IF 3.269
Lingyan Gui,Dongdong Li,Jiangtao Wu,Xianyang Meng
The apparent molar heat capacities of LiBO 2 (aq), NaBO 2 (aq), KBO 2 (aq), Na 2 B 4 O 7 (aq) and K 2 B 4 O 7 (aq) solutions at molalities from 0.01 to 2.6 mol·kg −1 , and at temperatures T = (298.12, 313.13 and 328.14) K have been determined using a Picker flow calorimeter built in this work. Further, the standard heat capacities of these solutes were derived from the experimental data by extrapolation to infinite dilution using the Pitzer ion-interaction model. The group contribution method is used to calculate the standard molar heat capacities of tetraborate ion in three equilibria for different assumptions, among which the prediction on the assumption that the standard molar heat capacity of reaction for the association reaction is zero is the most reasonable, and the results are in good agreement with the experimental data.
研究领域:
物理化学
·
热力学
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产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2023
·
IF 3.2
Zhongyue Wang,Zhi Wang,Menghu Li,Cheng Tang,Kehan Yu,Peng Lv,Wei Wei
NASICON-type Na 3 Zr 2 Si 2 PO 12 (NZSP) is supposed to be one of the greatest feasible solid electrolytes due to its high electrochemical performance and safety. Herein, Na 2 B 4 O 7 (NBO) additive is proposed to enhance the grain connection and ionic conductivities , and reduce the sintering temperature . The grain boundary microstructure of Na 3.3 La 0.3 Zr 1.7 Si 2 PO 12 (NLZSP) is adjusted via introducing NBO additive to facilitate the densification sintering at 950 °C. NLZSP with 3 wt% NBO (NZSP(NBO3)) demonstrates an optimized total ionic conductivity ( σ t ) of 1.81 mS cm −1 at 25 °C and low activation energy ( E a ) of 0.22 eV. EIS and SEM analysis reveals that NBO additive promotes more intimate contact between NLZSP grains and extensively reduces the grain-boundary resistance ( R gb ) from 135 Ω cm 2 for NLZSP to 8 Ω cm 2 for NLZSP(NBO3). Besides, wide electrochemical stability window of 5 V vs Na + /Na and galvanostatic sodium stripping-plating up to 400 h reconfirms the super stability of NLZSP(NBO3)/Na interface, while small contact angle of 82° will bring better wettability and interface contact of NLZSP(NBO3)/Na. Solid-state sodium metal batteries (SMBs) based reduced graphene oxide wrapped NaTi 2 (PO 4 ) 3 (NTP@rGO) 3D conductive cathode and NLZSP(NBO3) ceramic electrolyte shown excellent rate performance and cycle stability (91.4% of capacity retention after 200 cycles at 1C). Hence, NLZSP(NBO) ceramic electrolyte exhibits a significant advantage in enhancing grain connection, regulating ionic conductivity and reducing sintering temperature, and is anticipated to be used in all solid-state sodium ions batteries (ASSSIBs).
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Shanshan Li,Fanyong Yan,Dongyang Liu,Yu Wang,Wen Li,Cuiyan Zhang,Yang Fu
To achieve room-temperature phosphorescence (RTP) emission, two effective approaches are constructing rigid microenvironments and enhancing intersystem crossing (ISC) efficiency. However, designing highly efficient RTP carbon dots (CDs) remains challenging. Herein, the RTP CDs were fabricated through a synergistic combination of heteroatom doping and matrix-assisted synthesis strategies. The obtained B, N-doped composite materials N-CDs@Na 2 B 4 O 7 exhibit long-lived and color-tunable RTP emission. N-doping with lone-pair electrons facilitates the ISC process, thereby enhancing RTP emission. The boron‑oxygen network in sodium tetraborate (Na 2 B 4 O 7 ) effectively shields RTP emission from environmental quenching. Characterizations including X-ray Photoelectron Spectroscopy (XPS) demonstrated C B and B N bonds, confirming successful encapsulation of N-CDs within the Na 2 B 4 O 7 matrix. The RTP lifetime was extended from 32.79 ms to 122.00 ms with the incorporation of the matrix. The wavelength-dependent RTP color variation under UV excitation enables its application in multi-level information encryption. The detection of berberine hydrochloride (BRH) was based on the inner filter effect (IFE) of the N-CDs@Na 2 B 4 O 7 composite. The combined strategy provides experimental evidence for RTP color regulation. The resulting CDs exhibit excitation-dependent RTP. The resulting CDs demonstrate excellent performance in multi-level information encryption applications. With tunable colors and long lifetimes, making them highly suitable for multi-level information encryption.
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DOI
PubMed
高影响因子
Coatings
·
2022
·Vol. 12
·期 5
·578
·
IF 3.236
Su Pan,Xiaohua Tu,Jianxing Yu,Yang Zhang,Chengping Miao,Yaling Xu,Rui Fu,Jiayou Li
The optimization of NaOH-Na2SiO3-Na2B4O7electrolyte for the plasma electrolytic oxidation of AZ31B magnesium alloy was investigated through orthogonal tests. The properties of the anodized films were evaluated by film thickness, roughness measurements, salt spray tests, scanning electron microscopy (SEM), X-ray diffraction (XRD) and potentiodynamic polarization tests, respectively. The orthogonal tests revealed that the optimal formulation of the electrolyte comprised NaOH 45 g/L, Na2SiO350 g/L, and Na2B4O790 g/L. NaOH exhibited the most significant effect on film thickness, while Na2SiO3had the greatest effect on corrosion resistance. Moreover, the optimal electrical parameters were also obtained with the values of current density 1 A /dm2, oxidation time 15 min, pulse frequency 200 Hz and duty cycle of 10%. The surface morphology of the anodized coating formed under optimal conditions was uniform and compact. Furthermore, the phase compositions of all samples were mainly composed of MgO and Mg2SiO4. The corrosion potential, corrosion current density and polarization resistance of the prepared coating by plasma electrolytic oxidation improved remarkably compared with that of the substrate.
研究领域:
材料科学
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表面工程
·
腐蚀与防护
·
电化学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Yinghui Chen,Meng Peng,Hualiang Huang
This study investigated the collaborative corrosion inhibition behavior of sodium lauryl diphenyl ether disulfonate (SLDED) and Na₂B₄O₇ on AZ91D magnesium alloy in a 3.5 wt% NaCl solution at 30 °C, combining electrochemical experiments, surface characterization techniques, and theoretical calculations. The results showed that the corrosion inhibition efficiency of the compound corrosion inhibitor consisting of SLDED and Na₂B₄O₇ was significantly higher than that when they were used as a single corrosion inhibitor. When the concentrations of both SLDED and Na₂B₄O₇ were 5 g/L, the corrosion inhibition efficiency reached 87.50 %. This might be because the hydrophobic effect of adsorbed SLDED provided a guarantee for the complete precipitation of BO₂⁻, forming a dense insoluble borate precipitation film (MgBO₂(OH) + Mg₂B₂O₅), while the formation of the precipitation film induced by Na₂B₄O₇ could prevent the desorption of adsorbed SLDED and filled the tiny defects in the SLDED film, thereby enhancing the overall protective effect.
研究领域:
材料科学
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腐蚀工程
·
电化学
·
表面化学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2020
·
IF 2.888
Lele Chen,Xiuxiu Yang,Yafei Guo,Tianlong Deng,Dan Li,Lingzong Meng
The solubility corresponding solution physicochemical properties (densities, refractive indices and pH) in the quaternary system (NaCl + NaBO 2 + Na 2 B 4 O 7 + H 2 O) were investigated at 298.15 K by the isothermal dissolution equilibrium method. The dry-salt phase diagram, water content diagram, refractive index diagram and pH diagram were drawn. There are four crystallization fields corresponding to NaCl, NaBO 2 ·4H 2 O, Na 2 B 4 O 7 ·10H 2 O, NaCl·NaBO 2 ·2H 2 O, five univariant curves and two invariant points in the phase diagram of the quaternary system. The solubility, concentrations of boron species B(OH) 3 , B(OH) 4 − , B 3 O 3 (OH) 4 − , B 4 O 5 (OH) 4 2− and OH − in the system were calculated using the Pitzer model. The variation trends for calculated solubility curves and pH curves are consistent with the experimental results. The distributions of different boron species were obtained in the mixed borate solution. The distributions of four boron species were obtained in the mixed borate solution. The main boron species in the mixed borate solution are B(OH) 4 − and B 4 O 5 (OH) 4 2− . The mole fractions of the four boron species are mainly affected by m (B) in the solution but less by m (Cl − ).
研究领域:
化学热力学
·
无机化学
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 104
·期 2
·785-792
·
IF 3.502
Jinhua Zhang,Si Xiong,Jingran Wang,Yue’e Ni,Changming Ke
Phase pure and nano-sized hafnium diboride (HfB 2 ) fine powder was prepared via a novel sustainable silicothermic route at 1100°C from inexpensive raw materials HfO 2 , Na 2 B 4 O 7 and Si. By introducing sodium oxysalts as source of Na 2 O into the batch mixtures, the SiO 2 / Na 2 O modulus in the melt were reduced from 5:1 to 2:1, and the original water-insoluble byproduct SiO 2 was taken by the melt at test temperature and converted into water soluble sodium silicate (Na 2 Si 2 O 5 ) which was easily removed from the reacted mass via simple hot water washing. Consequently, the aqua sodium silicate could be readily recycled and used as a precursor for preparing many other valuable materials due to absence of foreign salts (eg halides, especially in the molten salt-assisted synthesis process) in the synthesis process, and the relevant environmental concerns could be alleviated. Using excessive amount of 20 wt% Si and 15 wt% Na 2 B 4 O 7 as compensation for the evaporation loss of silicon, in the form of SiO (g), and B 2 O 3 in the reduction process, a high reaction extent was achieved and HfO 2 and Na 2 B 4 O 7 were completely converted into HfB 2 at 1100°C.
研究领域:
材料科学
·
化学工程
·
可持续化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）