MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Huijun Guo,Jie Chen,Siqi Li,Yifei Qi,Guoxin Wang,Yue Zhang
In this work, a ratiometric double signals electrochemical sensing platform was constructed for creatinine (Cre) analysis employing silver nanoparticles (AgNPs)@ MXenes/thionine acetate (THAT) composites. The synthesis of MXenes/THAT composites was utilized to modify on the surface of a screen-printed electrode (SPE) via dripping coating, followed by the electro-deposition of AgNPs. While the anodic current of the AgNPs decreased in the presence of Cre due to the competive reaction for forming metal complexes, the current of THAT remained invariant, which attained a ratiometric response. Under optimized conditions, the response current ratio ( I Ag /I THAT ) decreases while the concentration of Cre increased linearly between 0 ∼ 1.2 mM, with 0.01 μM as a adaptive detection limit. It provided a new sensing platforming for employing double-signals nanostructures with remarkable stability and sensitivity to design ratiometic sensors for analysis of Cre in human urine samples with real-time.
研究领域:
分析化学
·
生物医学工程
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DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 8
·872
·
IF 2.935
Yongxian Zhao,Chen Ma,Shijie Cheng,Wei Xu,Yuejuan Du,Yansong Bao,Zuojie Xiao
Maleic anhydride (MAH)–divinyl benzene (DVB) multi-monomer melt-grafting onto isotactic polybutene-1 (iPB-1) was carried out in a torque rheometer. The effects of dicumyl peroxide (DCP), MAH, and DVB concentrations, and temperature, on the reaction, were investigated. The optimized conditions were 170 °C, DVB/MAH = 4:6 (mass ratio). DVB as a comonomer enhanced the grafting degree (Gd) and grafting efficiency (Ge) of iPB-g-MAH better than styrene. The initiator DCP had little effect on Gd as its concentration over 0.2 phr, but the grafts’ melt flow rate (MFR) increased significantly, and relative molecular weight decreased remarkably with increased DCP concentration. With increasing Gd, the contact angle of grafts with water decreased, and there was a larger crystallization rate. The study of iPB-1 and iPB-g-MAH (Gd = 1.5%)-modified polyamide 6 (PA6) showed that iPB-g-MAH had an obviously toughening effect on PA6. With increasing iPB-g-MAH concentration, the blends of impact strength and elongation at break increased obviously, tensile strength decreased slightly, and MFR decreased prominently, which greatly slowed the processing degradation of PA6. The properties of iPB-1/PA6 blends deteriorated. Both DSC curves and SEM micrographs confirmed that PA6/iPB-g-MAH blends had much better compatibility than PA6/iPB. The reason was that the anhydride group in iPB-g-MAH reacted with amide group in PA6 to improve the compatibility between two phases, and iPB-g-MAH is an excellent modifier for PA6.Keywords:isotactic polybutene-1;maleic anhydride;divinyl benzene;polyamide 6;modification
研究领域:
材料科学
·
高分子化学
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DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2016
·
IF 4.219
Hongying Su,Qingming Jia,Shaoyun Shan
Polysaccharide-based microgels with high water content, excellent biocompatibility and controllable particle size have been widely studied as ideal candidates for drug release and delivery. In this study, microgels based on dextran were developed via the Schiff base formation between aldehyded dextran and ethylenediamine in a water-in-oil (W/O) microemulsion. Particle size of the resulted microgel was controllable between 800 and 1100 nm by modulating the amount of the employed co-surfactants (Span 80/Tween 80). Furthermore, fluoresceins ( e.g. , aminofluorescein) and drugs ( e.g. , doxorubicin) with free amino groups can be conjugated onto the network of the dextran-based microgel via Schiff base linkages. Since the Schiff base linkages are degradable via hydrolysis and their stability decreases with the environmental pH decreases, the resulted Schiff bases contained microgel showed a pH dependent degradation profile. These results indicated that the pH-sensitive microgel based on dextran could be used as promising drug delivery systems for biomedical applications.
研究领域:
生物材料
·
药物递送系统
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DOI
PubMed
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2018
·Vol. 21
·期 3
·303-312
·
IF 1.454
Zexia Fan,Zhiyu Deng,Tengfei Wang,Weipeng Yang,Kun Wang
Tea saponin (TS) is a relatively inexpensive natural nonionic surfactant extracted from parts of tea plants, which can be modified into an anionic surfactant to achieve better surface activity. In this paper, the synthesis of TS-based succinic acid sulfonate as an anionic foaming agent is described. TS used as the hydrophobic source was modified by maleic anhydride (MAH) and then reacted with sodium bisulfite. Orthogonal experiment of a 2-step reaction was designed and performed, resulting in 9 kinds of succinic acid tea-saponin sulfonate (STS). 4-Dimethylaminopyridine and tetrabutylammonium bromide were, respectively, used as catalyst for the esterification with MAH and the sulfonation with sodium bisulfite. During the synthesis process, N , N -dimethylformamide was employed as the solvent and ethyl acetate as the extractant. The molecular structure of STS was confirmed by infrared spectroscopy and mass spectrometry. The foaming property of STS was investigated through comparison with different kinds of common surfactants. The results show great prospects of these environmentally friendly anionic surfactants. Graphical
研究领域:
化学工程
·
环境科学
·
材料科学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Hong Du,Ruiyi Chen,Jianjun Du,Jiangli Fan,Xiaojun Peng
A gold nanoparticle-based colorimetric sensor for the determination of creatinine was developed as an important index for early diagnosis of kidney function and corresponding renal diseases. Because of the unique synergistic coordination capability of adenosine and creatinine with Ag+ on a particle surface, our system exhibits an excellent selectivity to creatinine among various ions and biomolecules. There are good linear relationships of absorption changes (A630 nm/520 nm) over creatinine concentrations, so both colorimetric qualitative detection by the naked eye and quantitative determination by UV–vis spectrometer could be realized with an excellent limit of detection compared with that of other methods. Finally, by testing creatinine in practical samples, such as urine mimic and bovine serum, good recoveries were obtained with proper relative standard deviations.
研究领域:
生物化学
·
医学诊断
·
纳米技术
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产品关联
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 5
·552
·
IF 2.935
Xianggen Chen,Lingyun Wang,Jiuying Feng,Xianling Huang,Xiuzhi Guo,Jing Chen,Zhenyuan Xiao,Xiangjun Liang,Lijun Gao
Thermally and mechanically enhanced poly(propylene carbonate) (PPC) with networks was prepared by adding a cyclic carboxylic dianhydride, bicyclo(2,2,2)oct-7-ene-2,3,5,6-tetracarboxylic dianhydride (BTCDA), in the CO2/propylene oxide (PO) copolymerization. The obtained copolymers were characterized by FT-IR,1H NMR, DSC, and TGA. The gel, melt flow rate, hot-set elongation, and tensile properties were also measured. The formation of networks was confirmed by the presence of gel and the shape recovery after the hot-set elongation test. The minimum permanent deformation of the copolymer is 3.8% and that of PPC is 4539% higher than this value. The results show that BTCDA units are inserted into the backbone of PPC, and the PPC chains are connected successfully owing to cyclic multifunctional anhydride groups in BTCDA. With increasing feed molar ratio of BTCDA to PO from 1 to 4%, the yield strength of copolymers increases from 18.1 to 37.4 MPa compared to 12.9 MPa of PPC. The 5% weight-loss degradation temperatures and maximum weight-loss degradation temperatures greatly increase up to 276.4 and 294.7 °C, respectively, which are 58.6 °C and 55.1 °C higher than those of PPC. These enhanced properties originate from the formation of crosslinks by the rigid and bulky multifunctional dianhydride.Keywords:poly(propylene carbonate);networks;dianhydride;terpolymerization;modification
研究领域:
材料科学
·
化学工程
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DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Jian Lv,Chenxi Zhu,Haonan Qiu,Jing Zhang,Changdong Gu,Jie Feng
In severely cold regions, it is very difficult to prevent the formation of ice on solid surfaces, even on superhydrophobic (SH) surfaces. Compared with anti-icing surfaces, icephobic surfaces are more useful in practice. In this work, a traditional epoxy coating was modified by using maleic anhydride (MAH) as a crosslinking agent, in addition to filling a small amount of epoxy resin grafted with fluorine containing chains (FEP). The wettability and the mechanical properties of the modified coating, as well as the adhesive strength of ice on the coating surface and the stability of the icephobic properties of the coating, were systematically studied. The results showed that the modified coating surface became more hydrophobic and the force required to remove ice from the surface was less than that needed for removing on the unmodified coating surface. Furthermore, the modified coating has excellent mechanical properties. After sanding with abrasive paper, the unmodified coating surface is more hydrophilic, whereas the modified coating surface retains its hydrophobicity. X-ray photoelectron spectroscopy (XPS) indicates that compared with crosslinking by traditional polyamides, crosslinking using MAH greatly reduces the number of polar groups on the coating surface. The FEP introduction further reduces the free energy of the coating surface. As a result, the modified epoxy coating exhibits excellent icephobic performance. This study will be helpful for the design of icephobic epoxy coatings for use in practical applications. For example, it may make the de-icing on the underside of trains running in cold regions becomes more easily.
研究领域:
材料科学
·
表面工程
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产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2020
·
IF 4.605
Xin Ge,Mingming Chang,Wei Jiang,Bangwen Zhang,Ruiguang Xing,Chaoke Bulin
In the present work, maleic anhydride (MA) and biphenyl peroxide (BPO) were used in the preparation of kaolin (K)/poly(ε-caprolactone) (PCL)/poly(lactic acid) (PLA) composites with melt compounding method. Composition and structure of the composites were characterized by Fourier transformed infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and field emission-scanning electron microscopy (FE-SEM). Mechanical properties and thermal behaviors of the composites were further investigated. Kaolin selectively located in poly(ε-caprolactone) domains and at the phase boundaries, which improved the mechanical properties of the composites due to their rigid structure and high modulus. Influences of maleic anhydride on dispersion state of kaolin and two-phase structure of the composites were explored and discussed. Maleic anhydride enhanced the interactions among kaolin, poly(lactic acid) and poly(ε-caprolactone). Meanwhile, it improved the dispersion state of kaolin in the composites. In the presence of both kaolin and maleic anhydride, tensile strength at room temperature and storage modulus at 40 °C were enhanced to 41.2 MPa and 3.9 GPa, respectively.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Gu Guo,Yuanlong Guo,Hailiang Sheng,Pengcheng Liu,Lei Dai,Michael North,Lei Deng,Xiaofeng Luo,Haibo Xie
A series of cellulose grafted alternating cyclic anhydride (CA) and epoxide (EPO) copolyesters (cell- g -P(CA-alt-EPO)) have been prepared in the novel DBU/DMSO/CO 2 cellulose solvent system. The DBU acted both as a reagent for cellulose dissolution and as a catalyst for ring-opening copolymerization (ROCOP) of cellulose with EPO and CA. The structural features and thermal performances of cell- g -P(CA-alt-EPO) were characterized via MALDI-TOF, FT-IR NMR, TGA, DSC and XPS. Perfectly alternating sequence distributions and controlled molecular weights of a series of cell- g -P(CA-alt-EPO) were easily achieved by a variation of the CA or EPO. The cell- g -P(CA-alt-EPO) also had satisfactory UV-absorbing properties and cellulose grafted phthalic anhydride and glycidyltrimethylammonium chloride exhibited outstanding antibacterial behavior. Antibacterial activity against Escherichia coli and Staphylococcus aureus were 96.7% and 99.4% respectively. Thus, cell- g -P(CA-alt-EPO) with good solubility, melt processability, UV absorption and antibacterial properties have potential applications in UV-shielding and antibacterial agent fields.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Nannan Zhang,Xiao Chen,Shiyao Liu,Jipeng Meng,Marc Armbrüster,Changhai Liang
High-entropy alloys (HEAs), as new heterogeneous catalytic materials, possess remarkable catalytic performance in numerous reactions. However, rational and controllable synthesis of these complex structures remains a challenge. In this work, bulk and carbon nanotube (CNT)-supported ultrasmall PtFeCoNiCu HEA nanoparticles with an average particle size of 1.58 nm are prepared by lithium naphthalenide-driven reduction under mild conditions. The supported PtFeCoNiCu/CNT catalyst exhibits high catalytic activity in the aqueous-phase hydrogenation of maleic anhydride to succinic acid with a selectivity of 98% at full conversion of maleic acid (the hydrolysis product of maleic anhydride), a low apparent activation energy (Ea = 49 kJ mol–1), and excellent stability. Moreover, a much higher mass-specific activity of Pt in the catalyst is displayed over PtFeCoNiCu/CNT (1515.4 mmolmaleic acid gPt–1 h–1) than that of 5 wt % Pt/CNT (388.0 mmolmaleic acid gPt–1 h–1). This work provides a strong support for HEAs as advanced heterogeneous catalysts and will be of great significance for promoting the research and application of HEAs in the field of selective hydrogenation.
研究领域:
材料科学
·
催化化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Dingyuan Zheng,Zehuai Li,Wenrui Yao,Yuning Wang,Ce Sun,Haiyan Tan,Yanhua Zhang
Wood has garnered renewed interest due to its capacity to reduce carbon emissions when replacing non-renewable materials. Wood modification is often necessary because achieving optimal performance solely from the wood itself is challenging. Strategies for wood modification fall short of being genuinely sustainable and eco-friendly. In this context, a catalyst-free esterification method mediated by maleic anhydride (MA) is introduced for modifying wood. Notably, this approach aligns with principles of recycling, reuse, and reduction. A comprehensive comparison of MA-mediated wood esterification versus TEMPO-mediated wood oxidization highlights the effectiveness and superiorities of the MA esterification approach. Delignified wood esterified by MA (MA-DW) exhibits higher charge content (2.42 ± 0.24 vs. 0.53 ± 0.08 mmol/g), superior mass gain (18.4 ± 2.6 wt% vs. −15.92 ± 3.5 wt%), efficient recycling capability of the reaction medium (MA could be recycled five times, while TEMPO cannot be recycled), and integrity of the final products (retaining intact geometry vs. complete disintegration) compared to TEMPO-oxidized delignified wood (TEMPO-DW). Moreover, the MA-DW platform can serve in energy storage applications as an electrode or in sewage remediation applications as a catalyst. The esterification method mediated by MA provides an eco-friendly pathway for modifying wood, serving as a platform for creating diverse materials, potentially offering innovative concepts and insights for wood modification research.
研究领域:
材料科学
·
环境科学
·
化学工程
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产品关联
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2025
·Vol. 236
·期 4
·1-13
·
IF 3
Liu Lian,Wang Xin,Gao Zixin,Zhan Yue,Yao Mengqin,Bao Jia
Carbon capture, utilization, and storage (CCUS) has emerged as a critical strategy in combating climate change and global warming. Carbonic anhydrase (CA) exhibits exceptional potential as a biocatalyst for CCUS processes due to its remarkable ability to accelerate CO 2 hydration. In this study, CA was immobilized on ZnO nanocarriers of varying morphologies. The optimal immobilization conditions and enzymatic properties of the immobilized CA were investigated, followed by catalytic CO 2 uptake and mineralization experiments. The immobilization process resulted in several improvements: enhanced overall thermal stability, an elevated optimal reaction pH of 8.50 (compared to 8.00 for free CA), retention of 84.98% original activity after 30 days of storage at 4 °C, and preservation of 85.36% initial activity after five recycling cycles. While the affinity between immobilized CA and its substrate increased, a decrease in activity was observed. The Michaelis constant (Km) for immobilized and free CA were determined to be 17.22 mM and 34.92 mM, respectively, with corresponding catalytic efficiency (Kcat/Km) of 20.49 M −1 -S −1 and 148.91 M −1 -S −1 . The catalytic performance of immobilized CA was investigated by carrying out the CO 2 adsorption assay. Notably, the catalytic efficiency of immobilized CA in CO 2 absorption and mineralization under various conditions was significantly enhanced. Graphical
研究领域:
生物化学
·
环境科学
·
纳米技术
✓ 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）