APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Ruiming Fang,Zhongqing Yang,Zukhra C. Kadirova,Ziqiang He,Ziqi Wang,Jingyu Ran,Li Zhang
The visible-light photocatalytic reduction of CO 2 becomes a vital breakthrough to alleviate the greenhouse effect and achieve carbon neutrality. In this paper, ultrathin g-C 3 N 4 nanosheets of 1.74 nm were constructed, and K + was successfully doped between layers. The yields of CO and CH 4 are 1.65 μmol·g −1 ·h −1 and 0.15 μmol·g −1 ·h −1 , which are 4.70 and 7.27 times higher than the original g-C 3 N 4 , respectively. The ultra-thin nano-lamellar structure shortens the carrier transmission distance, and the intercalation of K + not only promotes the electron transport between g-C 3 N 4 layers but also changes the original hybrid mode of the catalytic system, thus shortening the band gap and adjusting the energy band structure. In addition, the CO 2 adsorption center of the K + intercalated g-C 3 N 4 is transferred from the coordinated carbon atom to the center of the triazine unit, and the binding energy is obviously increased, which strengthens the CO 2 adsorption. Finally, through in-situ DRIFT characterization, it is speculated that the reaction enhancement mechanism is that the modified catalyst promotes the adsorption and activation of CO 2 , resulting in the production of more intermediates, especially more hydrocarbon intermediates, which is more conducive to the photocatalytic reduction of CO 2 .
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Shenguang Ge,Yan Zhang,Lina Zhang,Linlin Liang,Haiyun Liu,Mei Yan,Jiadong Huang,Jinghua Yu
A trimetallic dendritic Au@PdPt nanparticles (Au@PdPt NPs) with intrinsic peroxidase-like catalytic activity were fabricated by a facile method. Au@PdPt NPs catalyzed the reduction of H 2 O 2 with the help of the electron mediator (thionine), which produced the electrochemical signals dramatically amplified. A sandwiched sensor was designed and implemented in the paper chip device for the determination of K-562 cells. The surface of dendritic Au@PtPd NPs was linked with folic acid by click chemistry. Folic acid was attached to the folate receptor (FR) of cell surface with high affinity. So, K-562 cells could be assayed based on folic acid-functionalized Au@PtPd NPs. On the other hand, folic acid-functionalized Au-paper working electrode on origami electrochemical device was fabricated, which could be used to capture K-562 cells. The twice utilization of folic acid for the capture of K-562 cells as well as the attachment of dendritic Au@PtPd NPs nanoprobe, which enhanced the selectivity of sensor for the determination of cells. The proposed biosensor exhibited excellent analytical performance toward the cytosensing of K562 cells with a wide detection linear range from 1.0 × 10 2 to 2.0 × 10 7 cells mL −1 and a detection limit of 31 cells mL −1 . Further, the proposed electrochemical sensor was applied to monitor cells. Au@PtPd NPs nonenzymatic catalysts could be used as signal-amplifying nanoprobes for ultrasensitive electrochemical sensing.
研究领域:
生物医学工程
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分析化学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Shuai Yu,Yan Cheng,Wenguo Xing,Fumin Xue
The solubility of gliclazide in five different binary solvent mixtures , (i.e. acetone-water, tetrahydrofuran-water, N , N -dimethylformamide-water, acetone-ethanol, and chloroform-ethanol) was measured in the temperature rang 278.15–318.15 K and at atmospheric pressure by a gravimetric method. The results show that the solubility of gliclazide increases with an increase in temperature and an increase in the mole fraction of nonpolar aprotic solvent . The combined nearly ideal solvent / Redlish-Kister (CNIBS/R-K) model, modified Jouyban-Acree model, non-random two-liquid (NRTL) model, and the Wilson model were selected to correct the solubility data. It was found that, solvent polarity has a critical effect on the solubility of gliclazide. The CNIBS/R-K model, with maximum RAD and RMSD values of 0.0540 and 0.000131, respectively, was found to be the best-fitting model for solubility data correction in the selected binary solvent mixtures. RAD values of all the selected thermodynamic models were <0.0806, that is, these equations produced well fitted results for the solubility data of gliclazide. These experimental data are of great significance for investigation of the crystallization process of gliclazide.
研究领域:
药学
·
物理化学
·
药物结晶工艺
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2013
·
IF 4.387
Ying Chen,Mengli Yang,Yun Xiang,Ruo Yuan,Yaqin Chai
Single nucleotide polymorphisms are the most common type of genetic variations among human beings and can serve as biomarkers for various types of diseases. In this work, based on ligase chain reaction amplification for the production of massive hemin/G-quadruplex DNAzymes to quench the electrochemiluminescent (ECL) emission of quantum dots (QDs), a universal and sensitive single nucleotide polymorphism detection method is described. During the ligase chain reaction process, the mutant K-ras target gene is recycled and exponentially duplicated, leading to the attachment of numerous G-rich sequences on the QD-embedded sensing surface. Upon the addition of the assistant sequences and hemin, numerous hemin/G-quadruplex DNAzymes are formed, which consume the dissolved oxygen in the detection buffer and result in significant quenching of QD ECL emission for sensitive single nucleotide polymorphism determination. The developed method shows a linear range of 50 fM to 50 pM and an estimated detection limit of 45 fM for the mutant K-ras gene. The proposed strategy also exhibits high selectivity towards the mutant K-ras gene against the co-existence of 10 3 -fold excess of the wild-type K-ras gene, which makes our method a useful addition to the alternatives for single nucleotide polymorphism monitoring.
研究领域:
分子生物学
·
医学诊断
·
生物传感技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Xiaoli Yang,Hongmin Duan,Ruifeng Wang,Fengwang Zhao,Fayi Jin,Wei Jiang,Guangting Han,Qingxin Guan,Haoxi Ben
The utilization of Cu-based catalysts in CO2 conversion into valuable chemicals is of significant interest due to their potential in mitigating greenhouse gas emissions. However, the controllable design of Cu-based catalysts and the regulation of their mechanism remain challenging. In this study, a series of efficient Cu/L catalysts were prepared for this process, and the intrinsic influencing factors on the reaction routes were systematically revealed. Various techniques revealed that Cu particles in L-supported catalysts exhibited higher dispersion and formed Cu–O(OH)–K interfacial sites. However, with increasing Cu loading, the dispersion of Cu particles and the percentage of Cu–O(OH)–K interfaces decreased. Kinetic investigations revealed that the adsorption configuration and electronic structure of Cu species codetermined the reaction pathways and resulting selectivity. Cu/L catalysts possessing Cu–O(OH)–K interfaces and small particles demonstrated the preferential formation of formate species, promoting methanol formation. However, larger Cu particles generated carboxylate intermediates, resulting in higher CO selectivity..
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jingkai Zhou,Gang Qu,Dandan Huang
A comprehensive phase equilibria investigation was conducted in the Gd 2 O 3 - NiO - ZrO 2 system and its binary subsystems (Gd 2 O 3 - NiO and NiO - ZrO 2 ) at 1773 K and 1573 K via solid-phase reaction approach. The NiO - ZrO 2 binary system was initially studied between 1373 K and 1773 K, and the decreased martensitic transition temperatures (1236 K) were determined, confirming Ni 2+ stabilization of t'-ZrO 2 . Homogeneity ranges for Gd 3+ and Zr 4+ in NiO demonstrated minimal temperature dependence. No intermetallic compounds were observed in these subsystems, but a new ternary compound NiO·ZrO 2 ·3Gd 2 O 3 (τ) was identified in the ternary system. Isothermal phase equilibria of the ternary system revealed extended three-phase regions (T + Fl + Hl, Fl + C+ τ etc.) and solubility variations with temperature. Based on experimental data and literature assessments, phase diagrams for the subsystems and ternary isothermal sections were constructed with high reliability.
✓ 已验证
产品关联
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2016
·
IF 1.846
Ying Zhang,Xiong Zheng,Maogang He,Yutian Chen
The thermal diffusivity and the speed of sound in dibutyl ether (DBE) were measured using light scattering method, including saturated liquid/vapor and supercritical region. The expanded relative uncertainty ( k = 2) of the thermal diffusivity and the speed of sound was estimated to be less than 2% and 0.5% over the whole investigated range of states. Polynomial representations for the thermal diffusivity and the speed of sound were fitted to the data in saturated liquid/vapor. For the thermal diffusivity, the AAD is 0.50% for the saturated liquid and 0.67% for the saturated vapor . For the speed of sound, the AAD is 0.41% for the saturated liquid and 0.35% for the saturated vapor. The tendency of the thermal diffusivity and the speed of sound to temperature and pressure in supercritical region are also analyzed.
研究领域:
物理化学
·
热力学
✓ 已验证
DOI
高影响因子
Chemistry Africa-A Journal of the Tunisian Chemical Society
·
2020
·Vol. 3
·期 3
·727-734
·
IF 0
Wang Yanfang,Guo Ying,Pan Kunming,Lin Xiaoyun,Ni Yongnian
In this paper, an electrochemical sensor based on depositing acid chrome blue K on the surface of glassy carbon electrode was developed for detection of nitrofurazone. The obtained poly-ACBK film was characterised by atomic force microscope. The experimental results indicated that the Poly-ACBK/GCE showed good electrocatalytic activity to the redox reactions of nitrofurazone by differential pulse voltammetry and cyclic voltammetry in Britton-Robinson buffer solution, and the different redox peak currents were observed in different pH ranges (2.0–6.0, 7.0–12.0). Base on these, electrochemical reaction mechanism of nitrofurazone was presented in different pH ranges. Under the optimal conditions, a linear relationship between the reduction peak currents and concentrations for nitrofurazone is figured out in the range of 0.75‒192 μM, with detection limits of 0.25 µM (S/N = 3). This sensor produced satisfactory reproducibility and stability and was successfully applied to monitor of nitrofurazone in real samples (nasal drops).
研究领域:
分析化学
·
电化学
✓ 已验证
DOI
BULLETIN OF THE CHEMICAL SOCIETY OF ETHIOPIA
·
2024
·Vol. 38
·期 3
·799-810
·
IF 1.3
Adel Noubigh
The solubility of two natural phenolic compounds (vanillic acid (VA) and vanillin (V)) in four individual solvents (ethanol, butan-2-ol, ethylene glycol, and ethyl acetate) was measured using the gravimetric method from 283.15 to 323.15 K at atmospheric pressure. The optimization of the complexes between VA–solvents and V–solvents using the B3LYP theoretic technique and the 6-31+G (d, p) basis set indicated that the absolute value of interaction energy was higher, suggesting that the interaction between solute and the solvent was stronger. In addition, two excellent activity coefficient models (NRTL and Wilson) were used to correlate and evaluate the equilibrium solubility results. The highest relative average deviation and root-mean-square deviation values for VA are 4.36% and 3.09 × 10-3, respectively, and 3.35% and 5.52 × 10-3 for V. Furthermore, the excess enthalpy of the solution was determined on the basis of thermodynamic relations and the Wilson model. The findings indicate that the dissolution process was endothermic.
KEY WORDS: Solid-liquid equilibrium, Vanillin, Vanillic acid, NRTL and Wilson models, Thermodynamic parameters
Bull. Chem. Soc. Ethiop. 2024, 38(3), 799-810.
DOI: https://dx.doi.org/10.4314/bcse.v38i3.19
研究领域:
化学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Yina Sun,Guangwen Li,Kangfei Lu,Xingchuan Yang,Li Xu,Guoji Liu,Yi Yu
Solubility data and regularity of 3-methyl-1,2-cyclopentanedione (MCP) in twelve pure organic solvents were investigated by static method under certain conditions. The results of experiments demonstrate that the solubility of MCP is proportional to the temperature. One of the most solubilizing solvents is dichloromethane. A preliminary assessment of the potential for chemical bond formation between the solute and the solvent was conducted by examining electrostatic potential energy surfaces of the solute. The dissolution behavior was explained by physicochemical properties (polarity, hydrogen bond donor–acceptor propensities and cohesive energy density (CED)) of solvent. The results demonstrate that polarity has a more pronounced impact on the dissolution process, but that other properties also effect the dissolution process to some extent. The Density Functional Theory (DFT) was applied to demonstrate interactions between solute and solvent during the dissolution process. Six thermodynamic models (van’t Hoff, Apelblat, Yaws, λh , Wilson, Jouyban) were utilized to fit solubility data. Wilson model exhibits the highest correlation. The thermodynamic properties indicate that the dissolution of the MCP can be described as an entropy-driven process, which is endothermic and spontaneous.
研究领域:
物理化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2014
·
IF 2.045
Hong Liu,Lin Zhu
Experimental values of densities and viscosities have been measured in the binary mixtures of butylcyclohexane (BCH) with n-heptane, n-octane, n-nonane, n-decane, n-dodecane, and n-tetradecane at temperatures T = (293.15 to 313.15) K and pressure p = 0.1 MPa over the entire mole fraction range. The excess molar volumes (VmE) and viscosity deviations (Δη) are calculated, and then the changes of VmE and Δη with the composition of BCH are fitted to the Redlich–Kister equation. The values of densities increase continuously with the increase of mole fraction of BCH while the values of viscosities show different trends. All the densities and viscosities decrease with the rise of temperature. The variations of VmE and Δη are discussed with the change of mole fraction of BCH and temperature. This work is useful to understand the molecular interaction in binary systems of liquid.
研究领域:
热力学
·
物理化学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Si Li,Lingyu Wang,Minghe Zhu,Dandan Han,Ya Liu,Mingyang Chen,Jie Hou,Junbo Gong
The solubility of cinnamyl alcohol in 11 pure solvents (methanol, ethanol, n-propanol, isopropyl alcohol, n-butyl alcohol, isobutyl alcohol, sec-butyl alcohol, acetone, methyl acetate, ethyl acetate and n-hexane) and two binary solvents of n-hexane + (n-propanol, n-butyl alcohol) was measured by a gravimetric method over temperatures from 253.15 K to 293.15 K at atmosphere pressure. From the experimental results, it was found that the solubility increased with the increasing temperature in all these solvents. The Apelblat model, the λh model, and the nonrandom two-liquid (NRTL) model were used to correlate the solubility data of cinnamyl alcohol in pure and mixed solvents. The thermodynamic properties of the mixing process in binary solvents were calculated by the NRTL model. The result indicates that the mixing process of cinnamyl alcohol is endothermic and spontaneous. The experimental solubility provides good guidance for the subsequent study of crystallization design and crystal morphology of cinnamyl alcohol.
研究领域:
化学工程
·
物理化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）