JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Ruitian Guo,Yan Wang,Shuai Heng,Guobin Zhu,Vincent S. Battaglia,Honghe Zheng
Organic energy storage materials attract extensive attention as a potential alternative for the next generation of lithium ion batteries . However, most of the reported organic electrodes can not achieve a good balance among high capacity, high rate and long cycle-life. In this work, pyromellitic anhydride is adopted as a new anode material for lithium-ion batteries. It exhibits superior electrochemical performances compared to most of the reported organic electrodes. The pyromellitic anhydride anode is able to reversibly deliver a capacity of 1472.2 mAh g −1 at 30 mA g −1 . Even at an extremely high current of 30 A g −1 , the electrode still retains 562.7 mAh g −1 . After a 500 electrochemical cycles at 150 mA g −1 charge and 600 mA g −1 discharge, almost no capacity loss can be observed. The good electrochemical performance of the pyromellitic anhydride anode is because of its excellent lithium conductivity capability, as well as the stable solid electrolyte interface film formed on the electrode.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ATMOSPHERIC ENVIRONMENT
·
2022
·
IF 5.755
Lingzhi Zhang,Zhiheng Wang,Weilai Zhang,Yongmei Liang,Quan Shi
Anhydrides are a class of oxygenated-PAHs commonly found in the atmosphere and tend to cause respiratory sensitization in humans. They are mainly formed by the photochemical reaction of polycyclic aromatic hydrocarbons (PAHs) with hydroxyl radicals and ozone during the daytime. However, there is significant uncertainty about the accurate quantification used by methanol in solvent extraction . In this study, anhydrides react with methanol and the degree of reaction varies among different structures. The concentration of phthalic anhydride (PA) could decrease for 80% in the presence of methanol, while 1,8-naphthalic anhydride (1,8-NA) was not muchly alcoholized. Moreover, the methanolysis products of PA undergo thermal decomposition at the gas chromatography (GC) inlet, which affects the detection results of the alcoholysis reaction. Five anhydrides were detected and quantified by gas chromatography-mass spectrometry (GC-MS) in atmospheric fine particulate matter (PM 2.5 ) collected in suburban Beijing, China, during the winter heating period in 2017. 3-Methylphthalic anhydride and 4-methylphthalic anhydride was detected for the first time. The carbon content of these anhydrides accounted for 0.40% of secondary organic carbon (SOC). This study reports some difficulties encountered in the solvent extraction and GC analysis, which aims to enrich the understanding of anhydrides in PM 2.5 .
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 67
·38305-38314
·
IF 2.936
Yingying He,Jiang Zhu,Wentao Wang,Haitao Ni
Hydrophilic cellulose nanocrystals (CNC) are typically poorly dispersed in non-polar polymer matrices and, hence, a method for the surface modification of CNC is developed for improving this dispersion. This method included an esterification reaction with acetic anhydride, butyric anhydride, and caproic anhydride. The particle size distribution (range of sizes: 80–310 nm) of CNC was determined. The SEM-EDAX indicated that (i) the structure of CNC was maintained even after incorporation of the acid anhydride and (ii) the carbon C content of modified-CNC was higher than that of pure CNC. The chemical structure of modified-CNC was identified via FT-IR and 13C NMR spectroscopy. The contact angle of CNC and modified-CNC with water and methylene iodide was measured. The surface energy of modified-CNC was lower than that of pure CNC. Thermal-property measurements indicated that the initial decomposition temperature (based on 5 wt%) of the modified-CNC was slightly higher than that of CNC. Poly(butylene succinate) (PBS) composites were obtained by mixing modified-CNC into a PBS matrix via simple melt blending of a double screw. The PBS/modified-CNC composites were investigated via DSC and XRD. Tensile testing indicated that the tensile modulus improved gradually with increasing modified-CNC content, whereas the elongation at fracture decreased.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2012
·
IF 2.721
Yumin Wu,Guangdi Ni,Fei Yang,Chuanxian Li,Guoliang Dong
To investigate the influence of structure variables of polymeric additives on the pour-point depression and rheological behavior of waxy crude oil, maleic anhydride co-polymer and its derivatives with different polar and/or aromatic pendant chains were designed and synthesized. All prepared additives were characterized by Fourier transform infrared (FTIR) spectroscopy and gel permeation chromatography (GPC). The pour-point and rheological properties of Changqing (CQ) crude oil with a low asphaltene content before and after additive beneficiation were studied in detail. Differential scanning calorimetry (DSC) and polarizing light microscopy were employed to gain insight on the interactions between such additives and wax crystals. The results are encouraging and showed that all four polymeric additives exhibited good efficiency as flow improvers in CQ crude oil. The reduction of pour-point and rheological parameters after additive addition largely related to the polymer structure. The polymer containing aromatic units showed the best performance, which could depress the pour point by 19 °C and decrease the yield stress as well as viscosity to a large extent.
研究领域:
石油工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Yuren Zhao,Mingyue Sun,Fang Zhou,Ge Xu
In this work, 0.75 wt ‰ 2,3-pyridinedicarboxylic anhydride (PDA) as a novel dopant was utilized to obtain modified graphitic carbon nitride with ultratrace doping (3MCN-PDA3) by facile thermal polymerization. Characterization of the microstructure, surface state, and porosity properties of the samples indicated that 3MCN-PDA3 has a thinner sheet-like, larger-scale, and tighter lamellar stacking structure than that of pristine graphitic carbon nitride (3MCN). Based on photo/electrochemical analysis, the PDA dopant formed an extended coplanar conjugated system by anhydride-amine thermal condensation with heptazine rings, and the channels of amide covalent bonds and superconjugation of the solitary pair of electrons of the nitrogen atoms of PDA synergistically promoted the charge transport performance of 3MCN-PDA3. Under visible light, the photodegradation efficiency of Rhodamine B (RhB) over 3MCN-PDA3 reached 92.4% in 60 min and realized almost entire removal in 200 min (99.2%), 1.43 times that of 3MCN. Furthermore, the experimental results and generalized density theory calculations confirmed that PDA acts as an intermediate molecular island and constructs an efficient carrier transfer pathway between different heptazine units. The results indicate that PDA is a promising candidate to enhance the charge transfer performance through ultratrace doping in the large-scale preparation and application of the graphitic carbon nitride photocatalyst.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
STARCH-STARKE
·
2024
·
IF 2.6
Liuyang Xiao,Jingru Zhang,Yumin Huang,Xiaofan Yang,Zhaojun Wei,Lihong Han
Very small granule starch is a good source for effective Pickering emulsion stabilizers. In this study, native Agriophyllum squarrosum ( A. squarrosum ) starch (N-AS) and native quinoa starch (N-QS) are modified by octenyl succinic anhydride (OSA), and the physicochemical as well as the emulsifying characteristics of two modified starches are evaluated. Fourier transform infrared spectroscopy (FTIR) shows that the esterification reactions between OSA and the two starches are successful, and the substitution effect of OSA-modified A. squarrosum starch (OSA-AS) is better than that of OSA-modified quinoa starch (OSA-QS). X-ray diffraction (XRD) analysis shows that OSA modification does not alter the crystal type of the starch particles. OSA modification increases the particle size and hydrophobicity of both starches, and the particles of OSA-AS are smaller than that of OSA-QS, which corresponded to the fact that N-AS possesses a smaller particle size compared to native N-QS. OSA-modified starches are arranged at the interface of oil–water to stabilize the emulsion. The OSA-AS displays better performance of stabilizing emulsion than OSA-QS. The Pickering emulsions formed by all OSA-modified starch samples are mainly elastic gel-like emulsions. In summary, OSA-AS is more suitable for Pickering emulsion stabilizer than OSA-QS.
研究领域:
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Waste and Biomass Valorization
·
2024
·
IF 2.6
Wang Xin,Yu Shenglong,Li Yuan,Fang Yue,Wang Yifan,Yalikun Nuerbiya
This paper investigates the recovery of waste PE (mulch film) from Xinjiang by solvent recovery method. Under the guidance of solubility parameter theory, combined by HSPiP (version 4.1.07) experiment and HSPs library screening, xylene was selected as the most suitable solvent for recovery of PE. Subsequently, the solid–liquid method was used to graft MAH (maleic anhydride) to PE, and the optimal process conditions were obtained through orthogonal experiments, and the successful grafting of MAH to PE was verified by infrared spectroscopy. Then through XRD(X-ray diffraction) and other checks to analyze the PE before and after grafting, MAH did not change the crystal arrangement of PE, nor did it alteration the crystal type, the introduction of MAH enhanced the surface energy of PE and reduced the regularity of the PE structure. The results of DSC(Differential scanning calorimeter) showed that after MAH grafting, the nucleation site on the surface of PE increased, which could make the modified PE crystallize rapidly, so that the cold crystallization peak disappeared, and the stability was enhanced, which is of great significance for subsequent asphalt modification. Graphical Abstract
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Shaohu Zhang,Qi Wang,Dan Li,Fen Ran
Permeability and selectivity are two important parameters for evaluating membrane separation performance. In this work, the functionalized single-walled carbon nanotubes (DexDTM- g -SCNT) is fabricated by non-covalent interaction using dextran-based macro-chain transfer agent, and used as an additive to blend with polyethersulfone to prepare ultrafiltration membranes via a non-solvent induced phase separation technique. DexDTM- g -SCNT modified membrane has excellent anti-fouling properties, good permeability, and excellent separation performance. Typically, the hydrophilicity of the modified membrane is significantly improved, when the content of additive is 3 wt%. The modified membrane shows high pure water flux of up to 223.3 L m −2 h −1 , and high rejection ratio for bovine serum albumin, and congo red of 98.5 and 98.8%, respectively. The strategy has great potential for practical applications in water purification and other separation fields.
研究领域:
材料科学
·
环境工程
·
膜技术
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 11
·8391-8399
·
IF 3.201
Yajie Wang,Qiang Wang,Xiaoping Song,Jingjing Cai
Dextranase is a unique biocatalyst for the enzymatic hydrolysis of dextran in carbohydrate chemistry, but the instability and poor recycling ability of dextranase significantly limit its long-term applications. As an alternative method, stabilization of dextranase on a solid carrier is a promising strategy. In this study, a kind of polyethylenimine (PEI) polymer modified magnetic particle was fabricated and employed as the substrate for covalent immobilization of dextranase (Fe3O4@SiO2-PEI-dextranase) to improve the stability and reusability performance for the first time. The grafted PEI polymer on the surface enhanced the amount of primary amine groups, and improved the loading capacity of dextranase on Fe3O4@SiO2-PEI-dextranase to 217.2 mg g−1, which was 3.84 times that measured on Fe3O4@SiO2-NH2-dextranase particles. Under the optimized conditions, high immobilization efficiency (72.38%) and enzymatic activity (82.84%) of Fe3O4@SiO2-PEI-dextranase were achieved. Thermal and pH tolerance, and long-term storage tests revealed that the Fe3O4@SiO2-PEI-dextranase exhibited much better stabilities. More importantly, Fe3O4@SiO2-PEI-dextranase retained 83.26% of its initial activity after reuse 15 times, suggesting its excellent reusability. It is believed that the immobilized dextranase could have potential applications in biological and biocatalytic fields.
研究领域:
生物化学
·
生物技术
·
酶学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Qiang Wang,Qian Wang,Xinming Fan,Chaofan Tang,Lu Zhou,Shan Liu,Hui Tang,Runjin Liu,Linka Zhu,Lei Zhang,Qinghua Tian,Xueyi Guo
In recent years, there has been notable advancement in the development of high-performance materials for sodium-ion batteries, particularly in layered oxide cathodes. However, research on enhancing the interface between electrolytes and cathodes remains nascent. One promising approach involves the addition of electrolyte additives, recognized for their cost-effectiveness and efficiency in bolstering the electrode/electrolyte interface to enhance material stability during high-voltage cycling. In this work, we investigate the use of glutaric anhydride (GA) as an electrolyte additive to improve the cycling stability of NaNi 1/3 F 1/3 M 1/3 O 2 /Na (NFM/Na) high-voltage sodium-metal batteries. Batteries using GA-containing electrolytes demonstrate impressive capacity retention: 80.51 % after 200 cycles at 4.0 V and 76.01 % after 150 cycles at 4.1 V. The research delves into the mechanistic insights behind GA’s effectiveness in enhancing cyclic stability. Theoretical calculations reveal that GA plays a crucial role in modifying the structure of the first solvation shells, promoting the formation of an elastic cathode-electrolyte interface (CEI) film enriched with O C O groups. This uniform and stable CEI film effectively preserves the material’s crystal structure and mitigates the dissolution of transition metals, thereby prolonging battery lifespan under demanding extremely cycling conditions.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Plasmonics
·
2024
·
IF 3.3
Cui Jiahao,Han Xue,Shi Guochao,Li Kuihua,Zhou Wenying,Li Zelong,Yu Zengshan,Wang Mingli
Surface-enhanced Raman scattering (SERS) sensors are ideal for point-of-care testing (POCT) of disease markers; the key to practical applications lies in their quantitative detection capabilities and high sensitivity. In this study, We propose a simple method to develop a high-sensitivity composite SERS substrate using physical vapor deposition (PVD) technology. This SERS substrate, utilizing 4-aminothiophenol (4-ATP) as the detection molecule, demonstrated a high enhancement factor (~ 10 6 ) and a low detection limit (10 −10 M). The corrected linearity problem achieved good linear correlation ( R 2 = 0.988) by using 4-ATP. In the trace detection process of creatinine, when creatinine is dissolved in goat serum solution diluted 1000 times, there is still a clear SERS signal at the characteristic peak when the concentration is only 10 −4 g/l, further demonstrating the potential of SERS sensors in the detection of renal disease biomarkers.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2024
·
IF 4.2
Han Hao,Tiantian Ren,Cuilu Quan,Wei Guo,Jing Wang
Pharmaceutical cocrystal is an emerging strategy not only to improve physicochemical properties, but also to generate synergistic effects. In this work, a novel cocrystal composed by 5-fluorouracil (5-FU) and sarcosine (SAR) was successfully assembled by wet powder grinding method. The cocrystal was characterized by single crystal X-ray diffraction (SCXRD), powder X-ray diffraction (PXRD), differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR) and Raman spectra. The differences of 1 H NMR spectroscopy between 5-FU/SAR physical mixture (PM) and cocrystal hinted the existence of supramolecular interactions between 5-FU and SAR in solid and solution. Bioavailability of cocrystal was increased than 5-FU. Most importantly, the weak interactions between 5-FU and SAR in cocrystal solution induced the superior cellar inhibition activity on 4T1 and BEL-7402 cells compared than 5-FU and PM. Cocrystal can interfere with the stability of methionine cycle and tetrahydrofolate (FH 4 ) level through the SAR-Gly-Met pathway, enhance the inhibition of thymidylate synthase (TS) compared to 5-FU, thereby interfering with cell cycle and inducing cell apoptosis. The results provided the novel strategy to develop the cocrystal drugs using bioactive amino acids as precursors to enhance the efficacy.
研究领域:
药学
·
肿瘤学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）