JOURNAL OF CHROMATOGRAPHY A
·
2022
·
IF 4.601
Mengyuan Li,Pengfei Li,Yehong Han,Dandan Han,Hongyuan Yan
In this study, a new rapid and inexpensive filter solid-phase extraction method (FSPE) was developed for the extraction and separation of five perfluorinated carboxylic acids (PFCAs) (namely, perfluorooctanoic acid, perfluorononanoic acid, perfluorodecanoic acid, perfluoroundecanoic acid, and perfluorododecanic acid) from milk samples. Commercial nylon 66 syringe filters were used as adsorbents without additional modification. The proposed method could achieve the fast adsorption of analytes by benefitting from the advantages of using the nylon 66 filter membrane on PFCAs with multiple adsorption interactions, namely, hydrophobic interactions and hydrogen bonds. The FSPE was designed to achieve the rapid isolation of analytes based on the rapid solid-liquid separation while using the solid-phase extraction disk. PFCAs residues in milk were extracted by first flowing the samples through a nylon 66 syringe filter from top to bottom. Double contact desorption with methanol was then accomplished by pulling and pushing the syringe, followed by derivatization with acetyl chloride-methanol. Finally, the extracted PFCAs residues were monitored using gas chromatography-tandem mass spectrometry (GC-MS/MS) quantification. Under optimal conditions, the established method presented good linearity (correlation coefficient ≥ 0.9996), precision (relative standard deviation ≤ 13%), accuracy (81–105%), sensitivity (limits of quantification: 4–18 ng kg −1 ) and extraction performance (10 min).
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Wei Wang,Zhenghao Li,Haibo Huang,Wei Li,Jianlin Wang
Nanocellulose-based gel polymer electrolytes (GPEs) for lithium-ion batteries have attracted great attention due to their biodegradable and renewable precursors, high thermal stability, good mechanical strength and electrolyte wettability. However, their abundant hydroxyl groups lead to the precursor films of GPEs with dense morphology, which severely affect their electrolyte uptake ratio and electrochemical performance. In this work, we aim to pretreat cellulose nanofibrils (CNFs) by acetylation to not only introduce ester groups in the according GPE to improve its electrolyte absorption capacity but also reduce the amount of hydroxyl groups for a stable battery cycle performance. At the optimal degree of substitution (DS) value of 2.37, the generated acetylated CNF (GACNF-3) GPE exhibited the best electrolyte uptake capacity of 301%, ionic conductivity of 2.73 × 10 −3 S cm −1 , and Li + ion transference number of 0.65. Due to the high transportation performance of Li + ions, mechanical strength (tensile strength of 37.66 MPa), and flexibility (elongation of 10.55%), the interfacial resistance of Li/GACNF-3 GPE/Li was 152 Ω, which only increased to 170 Ω after storage for 18 days. In particular, the assembled Li/GPE/LiFePO 4 battery demonstrated an initial discharge capacity of 153 mA h g −1 with capacity retention of 88.8% after 100 cycles at 0.2C. The proposed material design would provide a novel perspective for the development of polymer electrolyte for lithium-ion battery.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Kai-Qiang Ma,Jun Han,Chu-Ting Yang,Fan Zhang,Heng Yan,Feng-Cheng Wu,Sheng Hu,Liqun Shi
Separation of actinides is of great concern from the perspective of nuclear energy development and environmental issues, and the development of a highly efficient solid-phase extraction (SPE) process holds significant promise for actinide separation. However, the slow mass transfer kinetics in the currently available SPE separation media limited the throughput and efficiency, rendering the separation process more challenging. Hierarchically porous structures with well-organized and highly interconnected pore systems have been shown to provide efficient mass transfer and enhanced performance in nature. Herein, this paper reports the synthesis of a crack-free diglycolamic acid-functionalized silica monolith with hierarchical macro and meso porous structure for SPE. The hierarchically porous structures were retained upon mild modifications, which favored the convective mass transport and provided more binding sites, resulting in fast kinetics and high throughput. The separation ability was evaluated based on the separation and recovery of Th(IV) from a complex matrix. A superior Th(IV) separation performance ( K d > 2.6 × 10 4 mL/g) was achieved in the presence of alkaline earth metals, rare earth elements, and uranium within 1 min by batch sorption, and the maximum separation coefficients of Th(IV)/Ln(III) and Th(IV)/U(VI) exceed 1000 and 140, respectively. Particularly, the synthesized material allowed the separation of Th from monazite leachates with highly efficient recovery (> 96%) at a high flow rate (5 mL/min) by column study. Investigation of the binding mechanism revealed the formation of a stable coordination complex (Th(NO 3 )L 3 ) via Th−O bonds. The material was also employed for the extraction of Pu(IV), and satisfactory sorption was achieved. Thus, this new functionalized material has potential application prospects for an improved actinide separation process.
✓ 已验证
产品关联
DOI
高影响因子
Water
·
2023
·Vol. 15
·期 9
·1744
·
IF 3.4
Shaolin Qiu,Wenjiao Yuan,Yujie Qin,Xin Feng,Meitong Li,Yuhong Xie
Microplastic pollution is widespread around the world and inevitably comes into contact with organisms. With the accumulation of microplastics in the environment, the negative impact of microplastics on organisms has become the main focus in the field of microplastics. In this study, the different particle and concentration effects of fluorescent polystyrene microplastics (PS-MPs) onNostocaceaeandDaphnia Magnawere researched. The results indicate that PS-MPs adhered toNostocaceaethrough static electricity, which hindered the absorption of photons and CO2byNostocaceae, resulting in a decrease in chlorophyll, a low growth rate and high mortality forNostocaceae. PS-MPs with very small particles may be integrated into the blood ofDaphnia Magna, leading to an increasing trend of mortality and a decrease in spawning rate. The research provides basic data and a reference for the effect of PS-MPs on freshwater organisms and has implications for the further study of microplastics.Keywords:microplastics;fluorescent polystyrene;Nostocaceae;Daphnia Magna;photosynthesis;reproductive effect
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Jialin Li,Shanshan Zhou,Hao Pang,Yuewen Huang,Bin Wang
Star-shaped superplasticizers exhibited excellent dispersion performance on cement paste , but the molecular structure remained poorly controlled. This study develops three star-shaped block superplasticizers via atom transfer radical polymerization to investigate their effects on fluidity and early hydration in the Portland cement system. The three star-shaped block superplasticizers with acid to ether monomer ratio of 28, 36 and 100, are marked as SPCE-1, SPCE-2 and SPCE-3 respectively. Fluidity test shows that SPCE-1 and SPCE-3 with higher hydrodynamic radius exhibit better initial fluidizing effect than SPCE-2. Besides, there is competitive adsorption of SPCEs between the clinker phase and nano-ettringite in pore solution. SPCE-1 behaves best in fluidity retention due to the increase of adsorption amount over hydration time. A dispersion mechanism based on the extended-DLVO theory was proposed that SPCEs reduce hydrophobic interaction between cement grains and prevent agglomeration between cement grains and air bubbles.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Jiaming Liu,Xiaohong Liu,Xiaohua Cui,Jingjing Qin,Min Shi,Dingsong Wang,Liyan Liang,Chaolong Yang
Vitrimers are polymers possessing a covalent adaptable network (CANs) that can undergo a topological structural transformation under specific conditions, enabling material reprocessing. In this study, an active ester hardener containing imine bonds (TAI) was synthesized, and subsequently, epoxy resin with CANs (epoxy vitrimer, DGEBA/TAI) was prepared, which exhibited excellent thermal stability (initial degradation temperature of 364 °C and char yield at 800 °C of 30%), low water absorption (0.25 wt %), and good dielectric properties (dielectric constant of 3.37 and dielectric loss of 0.013). A comparative scratch healing test between the epoxy vitrimer and conventional epoxy resin showed that the hard vitrimer could not demonstrate self-healing ability and that scratch healing was derived from deformation recovery. The performance of such hard vitrimers should focus on recycling and reprocessing rather than a self-healing capability. Thus, the resin could be effectively recycled and reused by a hot pressing or solvent method, resulting in recycled resins with good tensile strength (70 MPa for hot-press welding and 58 MPa for solvent recycling) compared to the originals (69 MPa). In addition, the vitrimer materials allow shape reconfiguration through a network structure transformation, and an alternative analytical method was proposed to obtain the relaxation time of the vitrimer by fitting the equation of the stress relaxation curve, which could mitigate some of the interferences and provide a method for data reliability verification of the viscoelastic properties of the vitrimer.
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 7
·1596
·
IF 3.623
Peng Zhang,Yongqi Zhang,Xuan Wang,Jiaming Yang,Wenbin Han
Blending thermoplastic elastomers into polypropylene (PP) can make it have great potential for high-voltage direct current (HVDC) cable insulation by improving its toughness. However, when a large amount of thermoplastic elastomer is blended, the electrical strength of PP will be decreased consequently, which cannot meet the electrical requirements of HVDC cables. To solve this problem, in this paper, the inherent structure of thermoplastic elastomer SEBS was used to construct acetophenone structural units on its benzene ring through Friedel–Crafts acylation, making it a voltage stabilizer that can enhance the electrical strength of the polymer. The DC electrical insulation properties and mechanical properties of acetylated SEBS (Ac-SEBS)/PP were investigated in this paper. The results showed that by doping 30% Ac-SEBS into PP, the acetophenone structural unit on Ac-SEBS remarkably increased the DC breakdown field strength of SEBS/PP by absorbing high-energy electrons. When the degree of acetylation reached 4.6%, the DC breakdown field strength of Ac-SEBS/ PP increased by 22.4% and was a little higher than that of PP. Ac-SEBS, with high electron affinity, is also able to reduce carrier mobility through electron capture, resulting in lower conductivity currents in SEBS/PP and suppressing space charge accumulation to a certain extent, which enhances the insulation properties. Besides, the highly flexible Ac-SEBS can maintain the toughening effect of SEBS, resulting in a remarkable increase in the tensile strength and elongation at the break of PP. Therefore, Ac-SEBS/PP blends possess excellent insulation properties and mechanical properties simultaneously, which are promising as insulation materials for HVDC cables.Keywords:polypropylene;voltage stabilizer;HVDC cable;thermoplastic elastomer
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2021
·
IF 3.205
Rujie Yang,Fangbo Xia,Huanxing Su,Jian-Bo Wan
n-3 polyunsaturated fatty acids (PUFAs) and their metabolites play the crucial role in a wide range of physiologic and pathologic processes, including cardiovascular, neurodegenerative diseases, and inflammation-associated disorders. However, the quantitative analysis of n-3 PUFAs and their metabolites, oxylipins , is obstructed by high structural similarity, poor ionization efficiency and low abundance. In this study, a sensitive method was developed to quantify 28 n-3 PUFAs/oxylipins using chemical isotope labeling coupled with liquid chromatography-tandem mass spectrometry (LC-MS/MS). Standards labeled with cholamine- d 9 were used as one-to-one internal standards to achieve accurate quantification. The cholamine- d 0 -derivatized biological samples were mixed with cholamine d 9 -labeled standards for LC-MS/MS with multiple reaction monitoring. After cholamine derivatization, both MS sensitivity and chromatographic performance of n-3 PUFAs/oxylipins were substantially improved. Furthermore, the relationship between retention time and substituent position of regioisomers, and their fragmentation patterns were investigated, which may facilitate the identification of unknown oxylipins. Additionally, the developed method was applied to quantify the target n-3 PUFAs/oxylipins in serum and brain tissue from fish oil-supplemented mice, which exhibited its great potential and practicability. Collectively, this sensitive and reliable method may facilitate the elucidation of the roles of n-3 PUFAs/oxylipins in the physiological and pathological processes.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULAR PHARMACEUTICS
·
2021
·
IF 4.939
Chao Li,Yao Lu,Lili Cheng,Xiaoge Zhang,Jun Yue,Jie Liu
As a noninvasive therapy, high-intensity focused ultrasound (HIFU) shows great potential in inducing anticancer immune responses. However, the overall anticancer efficacy of HIFU is still limited due to the rapid attenuation of ultrasound waves and inadequacy of ultrasound waves to spread to the whole tumor. Here, we combined HIFU with the ultrasound contrast agent/chemotherapeutic drug co-delivery nanodroplets to achieve synergistic enhancement of anticancer efficacy. Different from the widely used thermal HIFU irradiation, by which excessive heating would result in inactivation of immune stimulatory molecules, we used short acoustic pulses to trigger HIFU (mechanical HIFU, mHIFU) to improve anticancer immune responses. The nanodroplets displayed a mHIFU/glutathione (GSH)-dual responsive drug release property, and their cellular uptake efficacy and toxicity against cancer cells increased upon mHIFU irradiation. The generated immunogenic debris successfully induced the exposure of damage-associated molecular patterns on the cell surface for dendritic cells (DCs) maturation. In vivo experiments with tumor-bearing mice showed that the co-delivery nanodroplets in combination with mHIFU could effectively inhibit tumor growth by inducing immunogenic cell death, activating DCs maturation, and enhancing the effector T-cell infiltration within tumors. This work reveals that combined treatment with nanodroplets and mHIFU is a promising approach to eradicate tumors.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2021
·
IF 3.196
Xin Feng,Xiaolin Yang,Meitong Li,Yujie Qin,Haiqing Li,Yuhong Xie
Polystyrene (PS), when used as a substrate, reacts with acetyl chloride through the Friedel–Crafts mechanism to yield fluorescent acetylated polystyrene. Different acetylated polystyrene microspheres can be obtained under different experimental conditions. The fluorescence of acetylated polystyrene is observed via fluorescence microscopy, while the quantum yield of acetylated polystyrene is determined using a steady-state transient fluorescence spectrometer. The surface morphology is observed via scanning electron microscopy, and the chemical composition and structure are investigated by Fourier infrared spectroscopy, ultraviolet spectrophotometry, X-ray diffraction, and nuclear magnetic resonance spectroscopy. Finally, the optimal reaction conditions are determined as follows: carbon disulfide (CS 2 , 35 mL), aluminium chloride (AlCl 3 , 1.161 g), acetyl chloride (AC, 1.171 g), soaking time of 12 h, temperature of 50 °C, and water bath for 5 h. Under these conditions, the acetylated polystyrene exhibited obvious fluorescence, with good fluorescence stability and coverage. Furthermore, it exhibited acid and alkali resistance, low-temperature resistance, and light resistance, and did not produce fluorescence leakage. In addition, it could be used as a tracer in organisms.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Guojian Yang,Baige Yang,Weijia Mu,Yinghao Ge,Yiru Cai,Zhiqiang Yao,Zhaoyu Ma,Yu-Mo Zhang,Sean Xiao-An Zhang
Due to the high energy efficiency and a wide range of potential applications in daily life, bistable electrochromic devices (BECDs) have gained extensive attention in recent years. However, poor bistability and slow response rate are the main barriers, which restrict the development of BECDs. Herein, a transparent multidimensional electrode with indium tin oxide (ITO) nanofibers and gold nanoparticles was fabricated to improve both the bistability and responsiveness of devices. Its criss-crossed ITO nanofibers with high length-to-diameter ratios to reduce the distance of heterogeneous electron transfer and its gold nanoparticles to form a stable Au–S bond to avoid self-erasing of electrochromic materials have been demonstrated and discussed systematically. This device based on the transparent multidimensional working electrode had a shorter response time (1/5) and a longer bistability (12/1) compared with the prototype devices based on common fluorine-doped tin oxide electrodes. Besides, this device had a promising electrochromic performance with a high coloration efficiency of 448.27 cm2/C and a switching stability with no significant attenuation after 1200 cycles.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 47
·51410
·
IF 3.125
Yanying Hao,Guyue Wang,Xiaoxue Shui,Anping Tian,Yong Yang,Jin Zhu
A series of bio-based diester plasticizers with various alkyl chain asymmetry and the same molecular weight were designed and synthesized, using renewable 5-hydroxymethyl-2-furancarboxylic acid (HFCA) as the raw material. The chemical structures of the HFCA-based plasticizers were characterized by Fourier transform infrared and nuclear magnetic resonance ( 1 H NMR and 13 C NMR). Besides, the influence of alkyl chain asymmetry on plasticization properties of the HFCA-based plasticizers in poly(vinyl chloride) (PVC) blends was also investigated. It was found that increasing the alkyl chain asymmetry of the diester plasticizer and keeping the molecular weight unchanged simultaneously could further improve its plasticizing efficiency, without sacrificing its volatility resistance and exudation resistance. The results showed that this study provided a new approach for further optimizing the overall properties of the asymmetric diester plasticizers.
✓ 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）