JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Wangchang Li,Weichao Yang,Yao Ying,Jing Yu,Jingwu Zheng,Liang Qiao,Juan Li,Shenglei Che
FeSiAl soft magnetic composites (SMCs) with phosphate-silicone resin as the insulating layer were prepared by phosphating FeSiAl powder with K 3 PO 4 solution. The effects of K 3 PO 4 content on the microstructure and composition of the insulation coating were investigated. Further, the soft magnetic properties of SMCs were analyzed in detail. It is revealed that the annealed inorganic coating layer which predominantly consists of Al(PO 3 ) 3 , Al 2 O 3 , and P 2 O 5 exhibits a high resistivity, high temperature resistance and thin thickness, significantly reducing the eddy current loss. The outstanding magnetic properties of a power loss of 118.6 kW/m 3 (100 kHz, 0.1 T) and permeability of 63.8 were achieved for this high-quality thin insulation coating. Moreover, the magnetic loss was separated into hysteresis, eddy current and excess part, and the mechanism was analyzed in detail. The reduced total loss can be ascribed to the suppression of the eddy current. The novel SMCs coating with K 3 PO 4 are particularly suitable for applications in high frequency and high DC bias situations for switching power supplies, photovoltaic inverter boost inductors and other applications.
研究领域:
材料科学
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电磁学
✓ 已验证
DOI
高影响因子
THERMOCHIMICA ACTA
·
2012
·
IF 1.805
Yang Lu,Juan Han,Chengzhuo Sheng,Ping Yu,Zhenjiang Tan,Yongsheng Yan
The phase diagrams for the systems containing polyoxyethylene (10) lauryl ether (POELE10) and three salts (KOH, K 2 CO 3 and K 3 PO 4 ) have been determined experimentally. Three experiential equations were used to correlate the binodal data. The liquid–liquid equilibrium data of these systems were obtained by experimental method and calculated method using lever rule. The tie-line data were correlated by using Othmer-Tobias and Bancroft and simple Setschenow-type equations. Furthermore, the effect of salt on the binodal curve for the studied systems has been discussed by means of salting-out coefficient, effective excluded volume (EEV) and Gibbs free energy of hydration of the ions (Δ G hyd ). It was found that the salts composed of anion with a higher valence are better salting-out agents than those with a lower valence. The order of salting-out abilities of salts is K 3 PO 4 > K 2 CO 4 > KOH for the investigated systems. Finally, the phase-separation ability of POELE10 is more powerful compared with that of other polymers and two-phase can easily form at the lower concentration, which indicates that lower cost is a remarkable advantage of POELE10–salt ATPSs.
研究领域:
化学
·
生物学
✓ 已验证
DOI
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2023
·Vol. 120
·期 30
·e2301622120
·
IF 11.1
Qingfeng Fu,Chi Peng,Wang Zhou,Xiangni Zhang,Keke Yang,Lanzi Chen,Ying Mo,Jian-Fang Wu,Peng Gao,Changling Fan,Chaohe Xu,Zhaohui Wang,Jilei Liu
Potassium vanadium fluorophosphate (KVPO4F) is regarded as a promising cathode candidate for potassium-ion batteries due to its high working voltage and satisfactory theoretical capacity. However, the usage of electrochemically inactive binders and redundant current collectors typically results in inferior electrochemical performance and low energy density, thus implying the important role of rational electrode structure design. Herein, we have reported a scalable and cost-effective synthesis of a cellulose-derived KVPO4F self-supporting electrode, which features a special surface hydroxyl chemistry, three-dimensional porous and conductive framework, as well as super flexible and stable architecture. The cellulose not only serves as a flexible substrate, a pore-forming agent, and a versatile binder for KVPO4F/conductive carbon but also enhances the K-ion migration ability. Benefiting from the special hydroxyl chemistry-induced storage mechanism and electrode structural stability, the flexible freestanding KVPO4F cathode exhibits high-rate performance (53.0% capacity retention with current densities increased 50-fold, from 0.2 C to 10 C) and impressive cycling stability (capacity retention up to 74.9% can be achieved over 1,000 cycles at a rate of 5 C). Such electrode design and surface engineering strategies, along with a deeper understanding of potassium storage mechanisms, provide invaluable guidance for better electrode design to boost the performance of potassium-ion energy storage systems.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2025
·
IF 2.1
Yuanxin Zhao
Isobutanol is a promising biofuel that can be produced via fermentation. However, its separation from water is challenging due to the formation of an azeotrope during distillation. This study investigates the effects of K3PO4 concentration and temperature on the phase separation of isobutanol–water azeotropes. Results show that increasing salt concentration significantly enhances isobutanol recovery and dehydration efficiency, while temperature has a relatively minor effect. Isobutanol recovery exceeded 99.9% and dehydration ratios surpassed 90% at higher salt concentrations, with minimal influence from temperature. The water content in the isobutanol-rich phase decreases sharply with salt addition, and the solubility of isobutanol in the aqueous phase shows a strong logarithmic decline. A good linear fit (R2 > 0.997) confirms the reliability of the correlation. These findings demonstrate that salting-out using K3PO4 is a highly effective strategy for improving the separation of fermentation-based isobutanol.
研究领域:
生物化工
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分离科学
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生物能源
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工业微生物学
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过程工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Chenxi Yi,Benfeng Zhu
The inhibiting behavior of K 4 P 2 O 7 , C 2 H 5 O 6 P and their mixture on Q235 steel corroding in the simulated stratum water has been investigated by using electrochemical noise (EN) and electrochemical impedance spectroscopy (EIS) techniques. The results show that the physical adsorption of KPP onto Q235 surface at 60 °C is somewhat faster than the chemisorption of HPAA. In the re-plotted energy distribution plot, the difference of the region where the EN energy is mostly accumulated may be adopted to distinguish the chemisorption and physical adsorption of inhibitors. Finally, the variation tendency of the charge transfer resistance obtained by EIS technique is just opposite to that of fractal dimension obtained by EN technique, which may hint that the initial corrosion processes of metals can be in-situ monitored by using EN technique expediently.
研究领域:
材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jianshun Feng,Mingxiu Hou,Qian Zhang,Dong Wang,Zhenjiang Li,Jie Liu,Yumin Wu,Lei Wang
Designing robust binders has been demonstrated to be an effective and facile strategy to stabilize Si anodes. However, the binders that performed well for Si nanoparticles are not applicable for low-cost and accessible Si micron-powders. Hence, a novel binder design strategy is still greatly required for practical micron-Si anodes. Herein, a robust water-based network binder (named as c-PTP-Alg) has been designed via coupling potassium tripolyphosphate (PTP) inorganic oligomer with alginic acid (Alg) organic macromolecule. Owing to the unique structure of PTP, a network with high mechanical resistance can be constructed in c-PTP-Alg binder via strong ion-dipole interactions. Moreover, the highly soluble and dispersed PTP inorganic oligomer in water prevents the organic macromolecule from aggregation. This induces a homogeneous texture in the c-PTP-Alg binder, which enables the polar groups in the composite binder to anchor micron-Si particles efficiently. Therefore, by simply applying the c-PTP-Alg binder, a significantly improved electrochemical performance of micron-Si anode with a high reversible capacity of 1599.9 mAh g −1 after 100 cycles at 3000 mA g −1 has been obtained. More specially, the high-energy-density Si||S-PAN full cells have also been constructed, showing the practical application prospect of the c-PTP-Alg binder.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Zilong Rao,Yu Zhang,Shuailong Zhao,Huai Liu,Rui Zhang,Wenlong Jia,Junhua Zhang,Yong Sun,Lincai Peng
Ethyl levulinate (EL) is a crucial biomass-derived compound with diverse applications in pesticides, rubber, pharmaceuticals, and fuel. The efficient conversion of straw into EL presents significant challenges, primarily due to the interference of inorganic components (IOCs). In this study, we aim to enhance the alcoholysis of straw by identifying the specific inhibitory factors and mechanisms of IOCs. A case study on rice straw as a reactant in ethanol over Al(OTf)3 revealed that K+ is a critical inhibitory factor impeding the hydrolysis of cellulose into glucose. Specifically, K+ is adsorbed on O of S–O–Al in [Al(EtOH)m](OTf)3, thus inhibiting the release of H+ and the cleavage of the glycosidic bond. Further, simulating computation reveals that K+ exhibits stronger electrophilicity than H of O–H in [Al(EtOH)m](OTf)3, thus inhibiting the cleavage of H from O–H in ethanol. Consequently, a simple, green acetic acid pretreatment strategy has been developed to enhance the alcoholysis of straw by efficiently eliminating K+, resulting in an EL yield of more than 10 times that of the pristine straw. In conclusion, this study improves the alcoholysis activity of straw and provides novel insights and potential strategies for biorefinery.
研究领域:
生物化学
·
生物质能
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 5
·2290-2298
·
IF 2.7
Xuewei Zhang,Jing Ye,Zhigang Ni,Xuerui Yang,Yuefei Ji,Jean-Marc Chovelon,Guangli Xiu,Lei Zhou
Kresoxim-methyl (KM), an extensively used strobilurin fungicide, displays broad-spectrum fungicidal activity. Despite its prevalent application in agriculture and frequent detection in the environment, specific studies on the photolytic fate of KM in natural surface waters are quite limited. To address this, the present study delves into the photochemical transformation of KM under light irradiation using a high-pressure mercury lamp. Photodegradation of KM followed pseudo-first-order kinetics, with a degradation rate constant of 0.067 ± 0.005 h−1, corresponding to a half-life of approximately 10.3 ± 0.7 h, and the quantum yield was estimated to be 6.95 × 10−3. Transient species identification experiments demonstrated the involvement of singlet oxygen (1O2) and singlet (1KM*) and triplet (3KM*) states. Four different photodegradation pathways, i.e., photoisomerization, hydrolysis, hydroxylation, and ether cleavage, were proposed. Toxicity assessments demonstrated that photodegradation effectively reduced the ecotoxicity of KM. Two typical pesticide adjuvants, namely, Tween 20 and sodium dodecylbenzenesulfonate (SDBS), were selected to evaluate their impacts on KM photolysis. While Tween 20 exhibited a remarkable increase in the photodegradation of KM, SDBS showed a concentration dependent behavior, with an inhibitory effect at low concentrations (<200 μM) and promotional effects at higher concentration levels. The present study elucidated the photolytic KM degradation mechanism, as well as its possible inhibition and enhancement, which is of significant importance for evaluating the environmental fate and ecotoxicological risks of KM in sunlit surface waters.
研究领域:
环境科学
·
农药化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Deliang Zhu,Xiaoyu Ji,Jiangnan Li,Chengyang Zhu,Hongyan Tang
Membrane fouling in water treatment impacts the efficiency and lifetime of nanofiltration (NF) membranes. Between the polyvinylidene fluoride (PVDF) substrate and the polyamide (PA) layer, sodium alginate (SA) hydrogel interlayers were introduced in this study. Subsequently, nano-CaCO 3 was deposited on the SA hydrogel interlayers membrane (PA-Alg membrane), encapsulated within the membrane using the interfacial polymerization (IP), and dissolved with acid to form nanovoids. Thus, NF membranes with excellent antifouling property and high permeability were fabricated. The SA hydrogel interlayers and the deposition and dissolution of nano-CaCO 3 were verified by X-ray photoelectron spectroscopy and Fourier transform infrared. A smooth membrane surface was observed using scanning electron microscopy and atomic force microscopy. The flux of the SA hydrogel interlayers and nanovoids (PA-Alg-NV) membrane was 86 % greater than that of the pristine membrane. The rejection values of the PA-Alg-NV membrane for MgSO 4 and MgCl 2 were 95.6 % and 95.1 %, respectively. The flux recovery ratio for humic acid, bovine serum albumin, oil/water emulsion, and SA through PA-Alg-NV membrane were 97.2 %, 97.3 %, 97.4 %, and 97.9 %, respectively. Long-term fouling tests and ten-cycle fouling tests indicated that the PA-Alg-NV membrane exhibited stable antifouling property. In general, the high permeability and excellent antifouling property of the PA-Alg-NV membrane were attributed to the SA hydrogel interlayers, which increased hydrophilicity and reduced PA layer intrusion into the pores, forming a thin and smooth surface. In addition, the permeability was further enhanced by the nanovoids within the membrane. This study presented an efficient approach for fabricating NF membranes with excellent antifouling property and high permeability.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 2
·330
·
IF 3.1
Jingjing Yuan,Jinbao Xu
Amphiphilic block copolymers-based aqueous color inks show great potential in the field of visual communication design. However, the conventional step-by-step chemistry employed to synthesize the amphiphilic block copolymers is intricate, with low yield and high economic and environmental costs. In this work, we present a novel method for preparing an amphiphilic AB di-block copolymer of PCL-b-PAA by employing a combined polymerization strategy that involves both cationic ring-opening polymerization (ROP) of theε-caprolactone monomer and the reversible addition–fragmentation chain-transfer (RAFT) polymerization on the acrylic acid monomer simultaneously. The corresponding polycaprolactone (PCL) and polyacrylic acid (PAA) serve as the hydrophobic and hydrophilic units, respectively. The effectiveness of the amphiphilic AB di-block copolymer as the polymeric pigment dispersant for water-based color inks is evaluated. The amphiphilic AB di-block copolymer of PCL-b-PAA exhibits a molecular weight of 1400 g mol−1, which is consistent with the theoretical value and suitable for polymeric dispersant application. The high surface excess (Γmax) of the PCL-b-PAA in water indicates a densely packed molecular morphology at the water/air interface. Additionally, micelles can be stably formed in the aqueous PCL-b-PAA solution at very low concentrations by demonstrating a low CMC value of 10−4wt% and a micelle dimension of approximately 30 nm. The model ink dispersion is prepared using organic dyes (Disperse Yellow 232) and the amphiphilic block copolymer of PCL-b-PAA. The dispersion demonstrates near-Newtonian behavior, which is highly favorable for the application as inkjet ink. Furthermore, the ink dispersion displays a low viscosity, making it particularly suitable for visual communication design and printing purposes. Moreover, the ink dispersion demonstrates an unimodal distribution of the particle size, with an average diameter of approximately 500 nm. It retains exceptional stability of dispersion and even conducts a thermal aging treatment at 60 °C for 5 days. This work presents a facile and efficient synthetic strategy and molecular design of AB di-block copolymer-based dispersants for dye dispersions.
研究领域:
材料科学
·
化学工程
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Chao Wang,Ting Jiang,Junwei Huang,Min Chen,Huimin Hu,Lei Peng,Lei Wu,Zeng Chaocheng,Qiwu Zhang
The remediation of high-concentration thallium (Tl + ) contaminated wastewater is a critical environmental concern. Current research emphasizes the effectiveness of adsorption and oxidation methods for Tl + treatment, yet challenges persist in enhancing their performance. This study explores the feasibility of emergency Tl + wastewater treatment and elucidates the mechanisms of Tl + incorporation into mineral structures, with a focus on the struvite mineral as a framework for Tl + integration via NH 4 + ion exchange. To assess the efficacy and mechanisms of Tl + immobilization, we utilized comprehensive analytical techniques, including X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Fourier-Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy with Energy-Dispersive X-ray Spectroscopy (SEM-EDS), Thermogravimetric Analysis (TG), and Density Functional Theory (DFT) calculations. The findings reveal that struvite adsorbs Tl + onto its surface, followed by an ion exchange process between monovalent cations (NH 4 + /K + ) within the structure and Tl + . Ultimately, Tl + is incorporated in the form of a (NH 4 ,Tl)MgPO 4 solid solution within the structure, achieving a remarkable maximum incorporation capacity of 320.56 mg/g, which significantly surpasses the capacity of typical adsorbents. The findings demonstrate significant Tl + incorporation, validating the approach for emergency wastewater treatment and suggesting the potential of mineralogy in environmental remediation. This research contributes to advancing heavy metal wastewater treatment strategies, offering a foundation for further investigation.
研究领域:
环境科学
·
矿物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACTA MATERIALIA
·
2024
·
IF 8.3
Jinping Mu,Xiaohui Li,Rui He,Lijing Sun,Xue Bai,Lihui Zhang,Xi Zhang,Zhenfa Liu,Jing Gao,Aijia Wei
High-voltage (5-V) lithium–ion batteries (LIBs) have garnered substantial interest due to their superior energy density. Nevertheless, the unstable interphase of high-voltage LIBs can cause electrolyte decomposition, electrode collapse, transition metal dissolution, and lithium dendrite growth during cycling, which impedes their widespread commercial use. To mitigate these challenges, various alkali-metal phosphates were incorporated into a carbonate-based electrolyte as film-forming additives, aiming to improve the electrochemical performance of LiNi 0.5 Mn 1.5 O 4 (LNMO)-based LIBs. Following a detailed comparison of the electrochemical performances of various alkali-metal phosphates, KH 2 PO 4 and NaH 2 PO 4 were selected for an in-depth investigation in this research. The highly protective passivation film generated by KH 2 PO 4 and NaH 2 PO 4 on the electrode surface provided significant protection by effectively inhibiting continuous electrolyte decomposition. This finding was supported by density functional theory calculations and a variety of electrochemical and characterization tests. The H 2 PO 4 − primarily contributed to the formation of the cathode electrolyte interphase film on the cathode surface. KH 2 PO 4 (via the electrostatic shielding effect of K + ions) and NaH 2 PO 4 (through the co-precipitation of Na + and Li + ions) both effectively inhibited the growth of lithium dendrites on the lithium metal anode. Additionally, the KH 2 PO 4 and NaH 2 PO 4 additives regulated the amount of HF in the electrolyte through acid–base equilibrium reactions. The electrolytes containing additives significantly enhanced the electrochemical performances of Li||Li, LNMO/Li, LNMO/graphite, and LNMO/Li 4 Ti 5 O 12 cells. LNMO/Li half-cells with standard electrolyte (STD) supplemented with KH 2 PO 4 and NaH 2 PO 4 additives demonstrated capacity retentions of 92.9 % and 90.0 % after 500 cycles at 5 C, respectively, in contrast to only 79.4 % for the STD electrolyte alone. Furthermore, the LNMO/graphite full cell exhibited an increased capacity retention, reaching 81.1 % (STD+KH 2 PO 4 ) and 78.29 % (STD+NaH 2 PO 4 ), up from 70.8 % with the STD, after 100 cycles at 0.5 C. Given their ease of use, affordability, and widespread availability, KH 2 PO 4 and NaH 2 PO 4 additives show significant potential to enhance the electrochemical properties of high-voltage LIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
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