JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Kui Wu,Yajun Li
The solid–liquid equilibrium data of o-toluenesulfonamide in 16 pure organic solvents, including methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, n-pentanol, isopentanol, acetone, ethyl acetate, acetonitrile, cyclohexanone, cyclopentanone, methyl acetate, ethyl formate, and dichloromethane, were measured by a static gravimetric method with the temperature ranging from 273.15 to 323.85 K under atmospheric pressure. The results showed that the solubility of o-toluenesulfonamide increased with the increasing temperature in all the solvents studied. The experimental solubility data were correlated by the modified Apelblat equation, λh equation, nonrandom two-liquid (NRTL) equation, and Wilson equation. All the models could be well employed, and the NRTL model gave the best fitting results.
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Molecular Catalysis
·
2022
·
IF 5.089
Ying Xiong,Xinwei Du,Peng Wang,Xiaogeng Feng,Junshuo Cui,Zhenning Lou,Weijun Shan,Haibiao Yu
This work aimed at elucidating the beneficial effect of the solid-phase grinding method on the catalytic performance of K- x Al for catalyzing γ-valerolactone to butene. Research indicated that a part of Al species was successfully introduced into the framework of KIT-6 support without destroying its original ordered mesoporous structure by the solid-phase grinding treatment method. Hence, Lewis and Brønsted acid sites were formed on the surface of the catalyst. By adjusting the amount of Al species, the content of weak acid sites (100-300 °C) on the catalyst surface can reach as much as 0.31 mmol·g −1 . Through the catalytic activity tested, the K-4Al catalyst exhibited optimum catalytic performance. The GVL conversion rate and butene yield can reach 96.2% and 90.1% at 300 °C, respectively. In addition, the K-4Al catalyst also showed satisfactory renewable performance in cycle tests. These findings will provide useful guidelines for further catalyst design for the preparation of butene from γ-valerolactone.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 47
·期 3
·118888
·
IF 6.3
Ji Huang,Liwen Qin,Yang Wu,Jingjing Chen,Xiangdong Ding,Changbai Long,Xue Chen,Laijun Liu
Calcium bismuth niobate (CBNO), known for its high Curie temperature ( T C ), has been investigated as a potential material for vibration sensor due to its ability to operate at elevated temperatures. However, the inherent weakness in piezoelectric response of CBNO has limited its sensing performance. This study successfully induced pseudo-tetragonal distortion in CBNO through the co-doping effects of K/Ce at A site and In/W at B site. This modification altered the interaction between the perovskite layer and the bismuth layer, thereby enhancing both piezoelectric and ferroelectric properties. The co-doped Ca 0.94 (K 0.5 Ce 0.5 ) 0.06 Bi 2 Nb 1.96 (In 1/3 W 2/3 ) 0.04 O 9 exhibits a significantly enhanced piezoelectric coefficient ( d 33 ) of 22.3 pC/N, compared to the 5~7 pC/N for pure CBNO ceramics, and the remanent polarization ( P r ) increased to 11.91 μC/cm 2 , compared to 3.83 μC/cm 2 for CBNO. Furthermore, the sample maintains a suitable resistivity ( ρ = 2.46 × 10 5 Ω·cm) even at 600°C. This work not only deepens the understanding of bismuth layer structure ferroelectrics (BLSFs) but also proposes a viable co-doping strategy, providing an effective approach for developing high-performance, high-temperature-resistant piezoelectric sensors.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Tingting Tang,Hua Huang,Chaoyang Li,Jian Shen
High performance and miniaturization are becoming increasingly important for practical microwave electronics and high-density communication systems. Here, LiNb 0.6 Ti 0.5- x (Zn 1/3 Nb 2/3 ) x O 3 (LNT- x ZN, x = 0, 2, 4, 6, 8 mol%) ceramics have been successfully prepared by a solid-phase reaction. The relationship between the physical structure, microscopic morphology, Raman spectroscopy , and microwave properties is revealed. The better microwave dielectric properties of the LNT-4ZN ceramic sintered at 1075 °C are ε r ∼59.9, Q× f ∼8261 GHz, and τ f ∼-7.4 ppm/°C. Using this ceramic, a miniaturized dielectric resonant antenna (DRA) is designed and demonstrated. The return loss, radiation efficiency, and realized gain of this device at the center frequency are −43.57 dB, 78.4 %, and 8.59 dB, respectively. The antenna, in addition to the good radiation performance, has a size advantage over similar devices (#Cylindrical sample, # R 3.1 mm × h 1.6 mm, @Square substrate, @ a = b = 18 mm × h 3.1 mm). This work exemplifies the great potential of LNT-4ZN materials in communication devices and promotes the application of microwave dielectric ceramics in antenna fields.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 40
·27606-27617
·
IF 3.3
Haiting Shi,Qingqing Wu,Jinxi Bao,Shuaitong Liang,Yanli Hu,Ruiqi Shao,Shuo Wang,Jie Shi,Zhiwei Xu
Fe2O3 is considered a potential electrode material owing to its high theoretical capacity, low cost, and non-toxic characteristics. However, the significant volume expansion and structural degradation during charging and discharging hinder its application in potassium ion batteries. The electrochemical properties of the electrode material are primarily influenced by the diffusion efficiency of ions and the mechanics of the object. From the construction of a one dimensional structure, a three-dimensional flower-like Fe2O3 with a high specific surface and low-dimensional spherical Fe2O3 were prepared. Considering the convenience and visualization of the research, micron-scale Fe2O3 was prepared, although the larger particle size will lose part of the capacity. Notably, compared with the spherical structure, the specific capacity of the flower structure was increased by about 100%. The von Mises stress distribution on the two structures was simulated by the finite element method, revealing the mechanism of electrode failure induced by volume expansion and confirming the vital role of the multidimensional system in relieving stress concentration and improving electrochemical performance. Furthermore, synchrotron radiation soft X-ray absorption spectrum and X-ray micro-tomography revealed the phase transformation process and reaction mechanism of Fe2O3 in potassium ion batteries. The dimensional structure construction strategy reported here can provide theoretical support for modifying transition metal oxides.
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PubMed
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Shi Feng,Jing Guo,Fucheng Guan,Jianbin Sun,Xuecui Song,Jiahao He,Qiang Yang
Advances in conductive hydrogels are responding to the emerging need for flexible strain sensors. However, achieving an excellent combination of injectability, conductivity, and sensing characteristics is challenging. For this purpose, suitable 3D printing inks are required to generate hydrogels with the desired morphological and functional characteristics. We composited thermosensitive kC with PVA using borax as a cross-linking agent and a source of conductive ions (Na + ) to obtain borax cross-linked PVA and kC conductive hydrogel inks. And then, the corresponding conductive hydrogels (B-PVA/kC) were successfully prepared using their thermal response behavior and freeze-thaw method. The results show that kC enables B-PVA/kC to undergo a rapid sol-gel transition when cooled from 70 °C to room temperature . The B-PVA/kC hydrogels show a fast, sensitive, and accurate response to movement. After a freeze-thaw cycle (1 F-T), the hydrogels still have good electrical conductivity and strain-sensing properties, with better strength and increased structural stability . More excitingly, this hydrogel can be printed in different shapes to fit the body better and also exhibits good sensing signals when compressed by external forces, which is expected to facilitate the personalization of flexible strain sensors.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Lu Dong,Shui Wang,Wenchao Ma,Dongxu Wang,Yixin Qu
In this paper, the solubility of levodropropizine, an important cough suppressant drug, in 13 pure solvents (including 8 alcohol solvents and 5 acetate solvents) was studied with the aid of a laser dynamic solubility-monitor device at a temperature from 283.15 to 323.15 K and atmosphere pressure. In the measured temperature range, the solubility of LVDP increases with increasing temperature and follows the following order: iso-butanol > iso-pentanol > n-hexanol ≈ n-heptanol > n-pentanol > n-propanol > n-butanol > iso-propanol > ethyl acetate > n-propyl acetate > n-butyl acetate > n-pentyl acetate > iso-propyl acetate. Three semiempirical models (modified Apelblat, three-parameter van’t-Hoff, and λh) and two activity coefficient models (Wilson and NRTL) were used to correlate solubility of LVDP as a function of temperature and the mixing thermodynamic properties of the 13 solutions were evaluated based on measured solubility and the parameter values of Wilson’s model.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Mengmei Liu,Zhihua Li,Yibo Zhang
The safety and low toxicity of aqueous zinc-ion batteries (ZIBs) are piqueing intense scientific interest. Slow reaction kinetics and substantial structural degradation of the cathode materials, however, prevent the creation of ZIBs. As a better cathode for ZIBs, tunnel-structured V 2 O 5 hierarchical with a high preintercalated K cation content (K-V 2 O 5 ) are proposed here. The K-V 2 O 5 are specifically made using a self-sacrificial template approach that also involves hydrothermal intercalation in a neutral solvent and phase change during annealing. A subsequent H + and Zn 2+ intercalation procedure at various voltage platforms is clarified when tested as cathodes for ZIBs. Prior to the subsequent insertion of Zn 2+ into V 2 O 5 , the water-solvated H + first enters tunnel cavities, which partially transforms the V 2 O 5 phase from a tunnel-type structure to a layered-type structure. The pre-intercalated K cations with a high content that act as pillars in the layered-type matrix stabilize the layered structures and widen the migration channels for Zn 2+ , which can aid in the diffusion of Zn 2+ in the V 2 O 5 cathodes.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Xinghui Wu,Lina Yang,Mingjie Xia,Kejin Yu,Wenqi Cai,Taiyuan Shi,Mengxi Xie,He Liu
The stable energy barrier of mucin and soy hull polysaccharide (SHP) is established at the air/water interface in the intestinal fluid and is conducive to the absorption and transportation of nutrients. This study aimed to investigate the effect of different concentrations (0.5 % and 1.5 %) of Na + and K + on the energy barrier through the digestive system model in vitro . The interaction between ions and microwave-assisted ammonium oxalate-extracted SP (MASP)/mucus was characterized by particle size, zeta potential, interfacial tension, surface hydrophobicity, Fourier transform infrared spectroscopy, endogenous fluorescence spectroscopy, microstructure, and shear rheology. The results showed that the interactions between ions and MASP/mucus included electrostatic interaction, hydrophobic interaction, and hydrogen bond. The MASP/mucus miscible system was destabilized after 12 h, and the ions could improve the system stability to some extent. MASP aggregated continuously with the increase in the ion concentration, and large MASP aggregates were trapped above the mucus layer. Furthermore, the adsorption of MASP/mucus at the interface increased and then decreased. These findings provided a theoretical basis for an in-depth understanding of the mechanism of action of MASP in the intestine.
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Greenhouse Gases-Science and Technology
·
2023
·Vol. 13
·期 5
·689-698
·
IF 2.2
Xuewei Tu,Luping Zhang,Yutong Chen,Shouxin Zhu,Can Sun,Jiali Jin,Min Liu,Hui Zheng
The conversion of CO 2 into valuable chemicals to reduce greenhouse gas emissions has received extensive attention. Converting CO 2 into pharmaceutical intermediates via graphitic carbon nitride (CN) at atmospheric pressure is a challenge. In this work, a series of novel graphitic carbon nitrides (K-CN) catalysts with different doping ratios of K were synthesized by post-treatment of CN with KOH as a dopant under magnetic stirring. Herein, substrates of o -phenylenediamine with different electron-donating/withdrawing groups were employed to convert CO 2 into high-value heterocyclic benzimidazoles. The optimal reaction conditions were determined by a single factor optimization approach. A series of benzimidazole derivatives were synthesized with a yield of up to 96% under atmospheric pressure, indicating that the catalyst can efficiently fix CO 2 . This work not only designs a simple and low-cost K-CN catalyst but also provides a new pathway for converting CO 2 into valuable benzimidazole derivatives at atmospheric pressure. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 18
·6162-6172
·
IF 6.4
Zhe Zhang,Peng He,Wenjun Ma,Peiyuan Zuo,Xiaoyun Liu,Qixin Zhuang
In order to solve the problem of signal delay and crosstalk caused by the miniaturization of VLSI circuits, it is urgently required to further reduce the dielectric constant (k) of materials. To date, porous low-dielectric materials still have shortcomings such as difficulty in controlling the pore volume and large fluctuation of k over a wide temperature range. Herein, a novel and controllable selective etching strategy to fabricate yolk–multishell mesoporous silica nanoparticles (YS-CSSs@3S-mSiO2) is reported. This strategy allows precise control of the number of spherical shell layers, diameter, cavity size, mesoporous structure and core size, coupled with the closed-pore silica spheres (CSSs) as the core so that the obtained YS-CSSs@3S-mSiO2 nanoparticles have a high pore volume (0.95 cm3 g−1), low specific surface area (144 m2 g−1), uniform diameter and excellent monodispersity. We found that the corresponding 8 wt%-YS-CSSs@3S-mSiO2/fluorinated polybenzoxazole (6FPBO) composite film possesses an ultralow dielectric constant (k = 1.87) that is very competitive among the low-k materials reported. Moreover, the nanocomposite films maintain great stability with almost unchanged k values over a wide temperature range up to 200 °C. The 5% weight loss temperature of nanocomposites reaches a maximum value of 540 °C. Accordingly, our current work provides a promising candidate for ultralow-k materials and lays a solid foundation for advanced material applications in the 5G communication and semiconductor field.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Xiaotong Yang,Jidong Wang,Miao Ma,Dongxu Wang,Jinliang Wu,Zhong Zhao
In this paper, the solubility of terbinafine hydrochloride in 13 mono-solvents was measured in the temperature range from 283.15 K to 323.15 K at ambient pressure with the assistance of a laser-based dynamic solubility-monitoring device. It was concluded that the solubility of terbinafine hydrochloride in these mono-solvents increases with rising temperature. At 323.15 K, the molar solubility shows the following order: cyclohexanol (7.739 × 10–2) > n-propyl alcohol (7.351 × 10–2) > n-amyl alcohol (6.967 × 10–2) > iso-butanol (6.932 × 10–2) > n-butanol (6.850 × 10–2) ≈ ethanol (6.778 × 10–2) > isoamyl alcohol (4.926 × 10–2) >1-hexanol (4.689 × 10–2) > dimethyl sulfoxide (4.010 × 10–2) > sec-butanol (2.878 × 10–2) > isopropyl alcohol (2.452 × 10–2) > isooctyl alcohol (2.211 × 10–2) > acetonitrile (0.532 × 10–2). Subsequently, the relationship between the solubility of terbinafine hydrochloride and temperature was correlated by six models (Apelblat, van’t Hoff, λh, Wilson, NRTL, and Jouyban models), and the mixing thermodynamic properties of the solutions were evaluated with the solubility and the parameters simulated by the Wilson model. In addition, the solvent effect on the solubility of terbinafine hydrochloride was discussed based on the Kamlet–Abboud–Taft linear solvation energy relationships.
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