THERMOCHIMICA ACTA
·
2013
·
IF 1.989
Wenli Zhang,Yutao Hu,Yun Wang,Juan Han,Liang Ni,Yingchun Wu
Liquid–liquid equilibrium data of aqueous two-phase systems (ATPSs) formed by poly(ethylene glycol) (PEG) of different molecular weights (1000, 2000, 6000) + ammonium carbonate ((NH 4 ) 2 CO 3 ), ammonium tartrate ((NH 4 ) 2 C 4 H 4 O 6 ), diammonium hydrogen phosphate ((NH 4 ) 2 HPO 4 ), ammonium sulfate ((NH 4 ) 2 SO 4 ) + water were determined at 298.15 K, respectively. The binodal data were correlated by using a four-parameter equation. The effect of PEG molecular weight on binodal curves was investigated, and it was found that the biphasic region expanded with an increase in PEG molecular weight. Meanwhile, it was also observed that the ability of the investigated salts for phase separation follows the order: (NH 4 ) 2 HPO 4 > (NH 4 ) 2 SO 4 > (NH 4 ) 2 C 4 H 4 O 6 > (NH 4 ) 2 CO 3 . Furthermore, a relatively simply two parameter equation, Othmer–Tobias and Bancroft equations was successfully used to correlate the tie-line data.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Xinxin Cheng,Yitong Dai,Jing Zhao,Jianzhou Wu,Haiyun Sun,Yongsheng Guo,Wenjun Fang
Densities (ρ) and viscosities (η) for the ternary system cyclopropanemethanol (1) + n-dodecane (2) + butylcyclohexane (3) and three corresponding binary systems have been measured at 11 temperatures from 293.15 to 343.15 K under atmospheric pressure. The excess molar volumes (VmE) and viscosity deviations (Δη) of binary systems have been calculated and fitted to the Redlich–Kister equation, while data of the ternary system have been fitted to the Clibuka, Singh, Nagata–Tamura, and Redlich–Kister equations, respectively. The value of the VmE of the investigated systems is positive, while the value of Δη is negative over the entire concentration range; the results are illustrated through molecular interactions and structural effects.
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FLUID PHASE EQUILIBRIA
·
2016
·
IF 1.846
Hua Sun,Lu Wang,Baoshu Liu
The solubility of α-glycine in water with different additives (sodium nitrate, ammonium nitrate , ammonium sulfate , and ammonium chloride) was measured under atmospheric pressure across the temperature range of (293.15–343.15) K at intervals of 10.00 K using a dynamic laser method. Solubility was found to increase with increasing temperature and additive level. The experimental data were correlated with the modified Apelblat model, nonrandom two-liquid model (NRTL), and λh model. The R 2 of the fitting regression indicated good applicability of these models to the glycine solubility data in the studied systems ( R 2 > 0.99). Apparent standard enthalpy, entropy, and Gibbs free energy changes of the solution were calculated based on the van't Hoff equation to elucidate the dissolution mechanism. The results showed that the dissolving process of glycine was endothermic, and the main dissolution driving force contributor was enthalpy in all the additive + water systems studied. By means of enthalpy-entropy compensation analysis, a non linear Δ H sol Θ versus Δ G sol Θ enthalpy-entropy compensation plot with positive and negative slopes was obtained for the systems studied. The evaluated values of H E showed that the mixing process of α-glycine in all the systems studied was exothermic.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Dong-Fang Zhao,Li-Sheng Wang,Jian Sun,Chuan-Ming Chen
A phosphorus flame retardant named resorcinol bis(cyclic 2,2-dimethyl-1,3-propanediol phosphate) (RCDMPP) was synthesized and characterized by high-performance liquid chromatography (HPLC), elemental analysis (EA), Fourier transform infrared spectroscopy (FTIR), mass spectra (MS), and nuclear magnetic resonance (NMR). Its thermal stability was evaluated via thermogravimetric analysis (TGA), and the fusion enthalpy and melting point of RCDMPP were detected by differential scanning calorimetry (DSC). The solubilities of RCDMPP in selected solvents at T = 293.15 to 333.15 K and atmospheric pressure were measured via a static-analytic method. The solubility data were correlated with modified Apelblat, Scatchard–Hildebrand, Buchowski-Ksiazczak (λh), nonrandom two liquid (NRTL), Wilson, and universal quasichemical (UNIQUAC) equations. The calculated results obtained from these models showed good agreement with the experimental data, and the NRTL, Wilson, and UNIQUAC models give better correlation results compared with modified Apelblat and λh models. The solubility parameter of RCDMPP was calculated by use of the Scatchard–Hildebrand methodology.
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JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Yujie Zhen,Qingqing Yin,Fangyu Zhang,Anle Zhang,Wenxue Lu,Tao Li,Yiwu Lu,Yingmin Yu
To explore the effective treatment of acrylic acid wastewater, liquid–liquid equilibrium (LLE) data for water + acrylic acid + {n-propyl acetate, n-butyl acetate, n-heptanol, and methyl isopropyl ketone} at 303.2 K and 101.3 kPa were measured respectively. The distribution coefficients ( D ) and separation factors ( S ) were used to assess the extraction effectiveness of the four solvents, and the results of the comparative data showed that the D values of the four solvents for acrylic acid ranged from 1.6 to 4.4, and the S values were in the order of n-butyl acetate > n-propyl acetate > MIPK > n-heptanol. The experimental data were fitted by NRTL and UNIQUAC models to obtain the binary interaction parameters, and the obtained above parameters were proved reliable by the mixing surface analysis method of Gibbs energy topology. The root mean square deviation ( RMSD ) of both models did not exceed 0.0051 and 0.0077, respectively. In addition, σ-profiles analyzed the differences in extraction effects in terms of interactions and interaction energies, and the analyses showed that the theoretical calculations are in agreement with the experimental results.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Da Li,Qifeng Kuang,Xiaoling Men,Bo Zhang,Jianqi Huang,Xiaolei Shang,Bing Yang,Teng Yang,Zhiwei Li,Zhidong Zhang
Composition/structure-dependent superconductivity for FeSe-based superconductors attracted great attention not only due to their high superconducting transition temperatures ( T C ), but also for understanding the origin of iron-based superconductivity. Here, we report a new Fe-poor organic-inorganic hybrid material Fe 14 Se 16 (tepa) 0.8 with a paramagnetic-diamagnetic transition at ∼42 K grown by a high-temperature organic-solution-phase method with soluble iron/selenium sources in a tepa solution, alternative to previous intercalation strategies. The Fe 14 Se 16 (tepa) 0.8 phase is in a tetragonal layered hybrid structure with a nanoplate shape. Composition analyses reveal a Fe-poor characteristic of the hybrid in contrast to previous FeSe-intercalated superconductor, and selected area electron diffraction pattern is featured by Fe 3 Se 4 superstructures with a √2 × √2 of Fe vacancy order. Ab initio density functional calculations show that minus Fe 3 Se 4 ions are stable in the hybrid and ∼0.25e − /Fe 0.75 Se is obviously larger than the reported values of approximately 0.2e − /FeSe in other FeSe-intercalated superconductors. Typical hysteresis loops and temperature dependence of dc/ac susceptibilities of the Fe 14 Se 16 (tepa) 0.8 measured below ∼42 K suggest a presence of the Meissner effect in this material. Effects of synthesis conditions on structures and magnetic properties of the hybrids show a magnetic evolution from a long-range ferrimagnetic (FIM) order of Fe 14 Se 16 (tepa) to a coexistence of FIM and superconducting (SC) orders of Fe 14 Se 16 (tepa) 0.9 and an SC order of Fe 14 Se 16 (tepa) 0.8 . X-ray absorption spectrum (XAS) confirms the presence of ferric/ferrous irons. Mössbauer studies reveal that the high- T C superconductivity originates from a suppression of the FIM order through tuning the spin states of irons from high-spin Fe 3+ ( S = 5/2) and Fe 2+ ( S = 2) in the Fe 14 Se 16 (tepa) to low-spin Fe 3+ ( S = 1/2) and Fe 2+ ( S = 0) in the Fe 14 Se 16 (tepa) 0.8 . Although no zero resistance is detected even at a temperature of 2 K, the resistivity at 2 K decreases by more than 1600 times compared to that in a normal state calculated by a variable range hopping (VRH) model, suggesting that the high- T C superconductivity of Fe 14 Se 16 (tepa) 0.8 is possible.
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Nanomaterials
·
2024
·Vol. 14
·期 21
·1721
·
IF 4.4
Qi You,Xuan Zhou,Chengxiang Yang,Mu Liu,Wei Liu,Jinkai Li,Xuchuan Jiang
A series of red-emitting phosphors, Na3.6Y1.8−x(PO4)3:xEu3+, have been synthesized by a high-temperature solid-phase method. The impact of the partial Li+/K+ion substitution on the crystal structure and photoluminescence (PL) performance of Na3.6Y1.05(PO4)3:0.75Eu3+phosphor have been investigated. Various techniques have been used for characterization of the as-obtained materials. X-ray diffraction (XRD) analysis was utilized to confirm the composites of these samples, and the morphology and element distribution were examined by scanning electron microscope (SEM) and transmission electron microscope (TEM). This study found that the developed Na3.6Y1.8−x(PO4)3:xEu3+phosphors exhibited a prominent emission peak at ~620 nm when excited at 393 nm, which corresponded to5D0→7F2transitions of Eu3+ions. Furthermore, the robust emission peak at ~705 nm (5D0→7F4) of these phosphors enables a better match with plant pigment absorption. Beyond that, the partial substitution of Li+/K+ions probably changed the crystal structure, and reduces the symmetry around Eu3+, leading to significantly enhanced luminous intensities by 23.24% and 18.29%, with the highest quantum yields (QYs) reaching 99.85% and 96.29%, respectively. Additionally, the prepared phosphors show non-thermal quenching and superior thermal stability at elevated temperatures from 298 to 473 K. These findings and results suggest that Li⁺/K⁺-substituted Na3.6Y1.05(PO₄)₃:0.75Eu3⁺ phosphors can serve as promising red-emitting phosphors for plant lighting applications.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2025
·
IF 2.1
Peilun Wang,Xiwei Ye,Yitong Dai,Ji Mi,Wenjun Fang,Pengfei Jiang,Yongsheng Guo
In order to achieve a comprehensive understanding of the properties of tetrahydrotricyclopentadiene (THTCPD) as a potential candidate for high-energy-density hydrocarbon fuels, the density and viscosity of binary mixtures comprising THTCPD and four representative hydrocarbons─n-dodecane, methylcyclohexane, decalin, and 1,2,3,4-tetrahydronaphthalene─were experimentally determined under conditions of T = (293.15 to 343.15) K and atmospheric pressure p = 0.1 MPa. At a constant temperature, both density and viscosity exhibited continuous increases with the rising molar fraction of THTCPD in the binary systems. Furthermore, the excess molar volume (VmE) and viscosity deviation (Δη) of these binary systems were calculated and subsequently fitted by using the Redlich–Kister equation. With the exception of the THTCPD + 1,2,3,4-tetrahydronaphthalene system, the VmE values for all other systems were negative, with their absolute values increasing as the temperature rose. The Δη values for all systems were also negative, and their absolute values decreased significantly with increasing temperature. These findings are interpreted in terms of intermolecular interactions and structural effects, providing critical reference data for the development of high-energy-density hydrocarbon fuels.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2024
·
IF 2
Yuxiang Liu,Hao Wu,Han Yue,Xiwei Hu,Qunsheng Li,Hongkang Zhao
We have determined the solubility of 4,4′-dimethoxybenzophenone (DMBP) in ten monosolvents and three binary solvent mixtures at temperatures ranging from 293.15 to 333.15 K and at atmospheric pressure. The solubility of DMBP in both monosolvents and binary solvent mixtures increases with temperature. The solubility of DMBP is greatest in the solvent benzene and lowest in the solvent methanol. The Apelblat equation is the most suitable equation for DMBP in both monosolvents and binary solvent mixtures, based on the results of our solubility experiment data and the data calculated by the thermodynamic models. The outcomes of the KAT-LSER model indicate that π* and δH play a prominent role in the dissolution behavior of DMBP. The mixing thermodynamic properties (ΔmixG, ΔmixH, and ΔmixS) demonstrate that the mixing process of DMBP is an entropy-increasing and spontaneous process, and whether the process absorbs heat or not is related to the properties of the solvents.
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ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Xuan Zhu,Yi-Fan Zhao,Hong-Jian Wen,Yu Lu,Shuai You,Richard Ansah Herman,Jun Wang
Silkworm pupae, by-product of sericulture industry, is massively discarded. The degradation rate of silkworm pupae protein is critical to further employment, which reduces the impact of waste on the environment. Herein, magnetic Janus mesoporous silica nanoparticles immobilized proteinase K mutant T206M and Mucor circinelloides aspartic protease were employed in the co-degradation. The thermostability of T206M improved by enhancing structural rigidity ( t 1/2 by 30 min and T 50 by 5 °C), prompting the degradation efficiency. At 65 °C and pH 7, degradation rate reached the highest of 61.7%, which improved by 26% compared with single free protease degradation. Besides, the immobilized protease is easy to separate and reuse, which maintains 50% activity after 10 recycles. Therefore, immobilized protease co-degradation was first applied to the development and utilization of silkworm pupae resulting in the release of promising antioxidant properties and reduces the environmental impact by utilizing a natural and renewable resource.
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PubMed
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yige Chen,Qiaoyu Huang,Man Zhou,Yong Hu,Yuhong Zhang,Xueliang Jiang,Zhaoxia Chen
Conductive hydrogels have demonstrated great potential in flexible wearable sensors due to their excellent flexibility and conductivity. Nevertheless, traditional hydrogels suffer from limitations such as weak mechanical properties, inadequate fatigue resistance, and lack of recyclability, which have hindered their practical applications. In this study, a polyvinyl alcohol/polyacrylamide/κ-carrageenan-Ca 2+ /K + (PPK-Ca 2+ /K + ) composite hydrogel was developed by constructing a dynamic network structure involving hydrogen bonds, electrostatic interactions, and synergistic co-crosslinking of Ca 2+ /K + . The resulting ionic conductive hydrogel exhibited remarkable stretchability (~ 414 %), high tensile strength (1190 kPa), and excellent fatigue resistance. Benefiting from the negatively charged κ-carrageenan and the ion transport co-regulation by Ca 2+ /K + , the hydrogel achieved a high ionic conductivity of 7.26 mS/cm. Moreover, owing to the thermoreversible properties of κ-carrageenan and PVA, the hydrogel material could be recycled through high-temperature remolding processes. The flexible sensor assembled with PPK-Ca 2+ /K + hydrogel demonstrated high sensitivity, a broad detection range (0–400 %), and rapid response time (152 ms), enabling precise monitoring of various human activities, ranging from large joint movements to subtle muscle contractions. The proposed fabrication strategy for robust, fatigue-resistant, self-healing, and recyclable conductive hydrogel provides new insights for developing high-performance wearable sensors and electronic skin.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 1
·487-492
·
IF 1.798
Zhang Xinxiu,Liu Jinsong,Zhu Kongjun,Wang Jing,Li Ziquan,Qiu Jinhao
High-quality lead-free piezoelectric x Mn-doped (K 0.48 Na 0.52 ) 0.985 Li 0.015 NbO 3 films (KNLN; x = 0, 0.01, 0.02, 0.03) were successfully deposited onto Pt(111)/Ti/SiO 2 /Si(100) substrates by sol–gel method. Effects of Mn substitution on the microstructure, dielectric properties, ferroelectric properties, and leakage current of the KNLN films were investigated in detail. Mn-doping can significantly improve the ferroelectric properties and decrease the leakage current of KNLN films. Optimal dielectric properties were obtained in films doped with 2 mol% Mn, whose dielectric constant and dielectric loss at 1 kHz were 875 and 0.030, respectively. In addition, well-saturated ferroelectric P - E hysteresis loop with large remanent polarization (2 P
r ) and coercive field ( E
c ) of 22.5 μC/cm 2 and 65 kV/cm were obtained in 2 mol% Mn-doped KNLN film at an applied electric field of 200 kV/cm.
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