POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 6
·2508-2516
·
IF 3.665
Tao Zheng,Wengui Wang,Yaochi Liu
In this work, a novel phosphorus–nitrogen flame retardant (CN-DOPO), which was successfully prepared via a facile method of graphitic carbon nitride (g-C 3 N 4 ) and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO). Polyamide 6 (PA6) composites were then prepared through melt blending with different ratios of g-C 3 N 4 /DOPO and different contents of CN-DOPO. CN-DOPO was characterized and confirmed using X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), and scanning electron microscopy (SEM). PA6/CN-DOPO composites were investigated by limiting oxygen index (LOI), vertical combustion (UL-94), thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), and thermogravimetric analysis-infrared spectrometry (TGA-IR). The results indicated LOI value was increased from 23.4% to 29.2% and successfully passed UL-94 V-0 rating when the presence of CN-DOPO increased to 15 wt%. Moreover, mechanical properties of PA6/CN-DOPO composites had not deteriorated significantly due to CN-DOPO having better dispersion and compatibility in PA6. The morphological of char layer revealed that CN-DOPO formed a highly integrated char layer surface during the combustion process, as compared to that of pure PA6. Meanwhile, CN-DOPO decomposed to release gases could inhibit decomposition by diluting flammable volatiles. Accordingly, the special gas-condensed phase synergistic flame-retardant mechanism of PA6/CN-DOPO was proposed. This work indicated that CN-DOPO could endow PA6 with highly effective flame-retardant and good mechanical performance.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Chemosensors
·
2022
·Vol. 11
·期 1
·27
·
IF 4.229
Meili Liu,Liuheng Xue,Qinghua Feng,Yingsha Wang,Jia Liu,Shouting Zhang,Wenping Hu
The Co3O4hollow dodecahedron (Co3O4@CN) was prepared by calcining ZIF-67 in N2and then air atmosphere. In the Co3O4@CN compound material, Co3O4nanoparticles (Co3O4NPs) are anchored in the carbon skeleton, solving the aggregation problem of Co3O4NPs. Because Co3O4@CN retains the porous structure of ZIF-67, and the presence of Co2+and Co3+favors electron transfer between the enzyme substrates, it has excellent peroxidase-like (POD-like) activity. Enzymatic kinetic tests show that Co3O4@CN has approximately six times more affinity for TMB than HRP and the maximal reaction rate is approximately three times that of HRP. The cholesterol sensor was constructed with Co3O4@CN, and its linear range was 20-1000 μM, and the detection limit was 14.33 μM. The application of Co3O4@CN to the detection of human serum cholesterol will be a valuable research direction.Keywords:Co3O4@CN compound material;peroxidase-like activity;cholesterol sensor
研究领域:
生物化学
·
医学检测
·
纳米材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Fang Hu,Wancun Zhang,Jiaqi Zhang,Qi Zhang,Tao Sheng,Yueqing Gu
In this study, a simple, economic, and label-free electrochemical biosensor was developed for highly sensitive and selective miR-21 detection based on Fe(CN) 6 3− /Fe(CN) 6 4− electrochemical signal, which relies on DNA structures conjugating with carboxyl multi-wall carbon nanotubes (MWCNTs-COOH)-modified glassy carbon electrode (GCE). High sensitivity and specificity of the biosensor were achieved by taking advantage of the target-recycled non-enzymatic amplification strategy (TRNEAS), which relies on sequence-specific hairpin strand displacement and does not require the addition of environment-susceptible enzymes. Besides, the SP-DNA strictly binds to the cMWCNTs/GCE via amide bonds, which ensure good electrochemical results and excellent stability for target miRNA detection. The developed miR-21 electrochemical biosensor exhibited a broad linear dynamic range of 0.1 fmol to 5 pmol and a detection limit of 56.7 amol for miR-21 detection in vitro . The relative miR-21 expression levels were particularly detected by our developed miR-21 biosensor and were highly consistent with the stem-loop RT-PCR results. In summary, our developed electrochemical biosensor exhibits great potential for further application in biomedical research and early clinical diagnosis.
研究领域:
生物传感器
·
电化学
·
纳米技术
·
分子生物学
·
临床诊断
✓ 已验证
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Mingyu Cui,Chong Liang,Wei Zhao,Xutang Liu,Linyang Dong,Dingkai Wang,Shuiyuan Fu,Zhijie Jiang,Fei Wang,Xianyong Wei
As the most abundant resource composed of aromatic groups in nature, lignin harbors significant potential for the production of bio-based fuels and chemicals. In recent years, solar-driven photocatalysis with its mild, low cost and environmental benign, has been employed for lignin depolymerization . Herein, we designed a Z -scheme CdS/H 5 PMo 10 V 2 O 40 /g-C 3 N 4 (CdS/HPA-2/CN) photocatalyst via hydrothermal method for the photocatalytic depolymerization of lignin. The prepared CdS/HPA-2/CN presents a nanoflower-like morphology with the average diameter of ∼600 nm. With the presence of electron-mediated HPA-2, CdS/HPA-2/CN exhibits the enhanced separation and transfer capacity of photogenerated charge carriers through Z -scheme mechanism. Result shows that the total yield ( Y ) of vanillin and vanillic acid from lignin depolymerization over optimized CdS/HPA-2/CN can reach to 32.7 mg/g lignin in DMF/formic acid ( v / v = 40/10) for 4 h. Reusability experiment of optimized CdS/HPA-2/CN displays that Y (26.5 mg/g lignin) can still reach to 81.0% of initial one after three cycles. Qualitative analysis of depolymerized products reveals that most components are aromatic compounds with the dominant products of vanillin and vanillic acid. Evidence also shows that photocatalysis promotes the reaction and small molecular products increased significantly after depolymerization. In addition, mechanism experiments and electron spin resonance tests exhibit that h + , ·O 2 − and ·OH took part in lignin depolymerization together and the effect sequence was ·O 2 − > ·OH > h + . In this work, as an electron mediator, HPA-2 provides the inspiration for construction of Z -scheme heterojunction , and CdS/HPA-2/CN exhibits enormous potential in lignin depolymerization by photocatalysis.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yuqi Liu,Yongqing Zhang,Lijin Zhang,Waseem Hayat,Xuefeng Wu,Hong Meng,Que Wu
The advanced oxidation processes using persulfate (PS-AOPs) as oxidant is an effective way to remove refractory organic pollutants from environment. Designing activators with higher activation efficiency and stability plays an important role in degradation of organic pollutants via PS-AOPs. Furthermore, redox and adsorption properties of pollutants also affect the selective degradation efficiency. In this study, we synthesized FeNi@CN derived from ZIF-8 in which highly dispersed Fe and Ni were anchored on nitrogen (N) doped carbon (C). The activator exhibited high activation potential and stability for paracetamol (PCT) degradation by activated peroxymonosulfate (PMS). The FeNi@CN/PMS system degraded PCT through electron transfer pathway, and the coordination of Fe-N and Ni-N improved the efficiency of catalyst mediated electron transfer. The abundant pyridinic N provided a large number of sites for PMS complexation. The bimetallic synergistic effect and N doping endowed the excellent comprehensive performance of FeNi@CN. The significant impact of pollutant redox and adsorption properties on degradation efficiency were also studied. It was observed that high half-wave potential ( E 1/2 ) and excessive adsorption were not conducive to electron transfer. Multi-parameter linear fitting was performed on the degradation rates of different pollutants using half-wave potential and pseudo first order adsorption rate constants, which showed the good correlation among them. This work not only provided insights into the mechanism and the influence of activator structure on electron transfer in PMS activation, but also proposed a new model to describe the effects of redox and adsorption properties on selective degradation of various category pollutants.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Electronic Materials
·
2020
·
IF 0
Tianshu Zhai,Rongbin Wang,Takayoshi Katase,Frances Quigley,Hiromichi Ohta,Patrick Amsalem,Norbert Koch,Steffen Duhm
Tailor-made electrode work functions are indispensable to control energy-level offsets at the interfaces of (opto-)electronic devices. We show by means of photoelectron spectroscopy that several nanometer thick layers of the organic semiconductor 1,4,5,8,9,12-hexaazatriphenylene-2,3,6,7,10,11-hexacarbonitrile (HAT-CN) on virtually all substrates provide hole-injecting electrodes with work functions of around 5.60 eV. This substrate-independent energy-level alignment is due to a relatively large density of gap states in HAT-CN thin films, which is clearly visible in the photoemission data. Furthermore, this additional density of occupied states makes the wide-gap semiconductor thin films sufficiently conductive for electrode applications. Moreover, our study highlights a quite intriguing energy-level alignment scenario as the Fermi-level in HAT-CN thin films is located far from the midgap position, this is rather uncommon for undoped organic semiconductor thin films.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 36
·14327-14335
·
IF 3.069
Wancun Zhang,Fang Hu,Xianwei Zhang,Wei Meng,Yaodong Zhang,Yinsen Song,Huanmin Wang,Peng Wang,Yueqing Gu
In this study, a simple, robust, label-free electrochemical biosensor based on the ligase chain reaction (LCR) was developed for the highly sensitive and selective detection of single nucleotide polymorphisms (SNPs) using Fe(CN)63−/Fe(CN)64− as a redox indicator. High sensitivity and specificity were achieved by using the LCR, which employs a thermostable and single-base discerning Hifi Taq DNA ligase to repeatedly ligate adjacently hybridized LCR-specific probes during thermal cycles, resulting in the highly specific exponential amplification of DNA targets. The electrochemical signal of the biosensor was further decreased using stem-loop probe DNA (SL-DNA), which specifically hybridized with LCR products on the electrodes. The linear dynamic range and high sensitivity of the mutant DNA (MutDNA) and wild-type DNA (WtDNA) LCR-based electrochemical biosensors for the detection of MutDNA and WtDNA were studied in vitro, with a broad linear dynamic range of 10 aM to 10 pM and detection limits of 1.18 aM and 0.35 aM, respectively. In addition, the MutDNA and WtDNA LCR-based electrochemical biosensors were able to accurately detect allele frequency changes as low as 0.1%. In summary, the developed LCR-based electrochemical biosensor provides a useful platform to monitor SNPs in a highly sensitive and specific manner.
研究领域:
生物传感
·
分子生物学
·
电化学
·
遗传分析
✓ 已验证
DOI
高影响因子
ENZYME AND MICROBIAL TECHNOLOGY
·
2022
·
IF 3.705
Hao Zhang,Zhao-Miao Gong,Yan Li,Feng-Qing Yang
A convenient and green method was developed using a personal glucose meter (PGM) for direct determination of hydrogen peroxide and hypochlorite in household disinfectants based on the acetylthiocholine iodide (ATCI)-mediated reaction. In this method, acetylcholinesterase catalyzes the hydrolysis of ATCI to generate thiocholine iodide, which can trigger the reduction of K 3 [Fe(CN) 6 ] to K 4 [Fe(CN) 6 ] and generate a PGM detectable signal. When the hydrogen peroxide or hypochlorite is pre-incubated with the ATCI, the yield of thiocholine will be decreased because the iodine molecules can initiate the oxidation of thiocholine to disulphides , leading to a lower PGM readout. Thus, the hydrogen peroxide or hypochlorite can be directly quantified by PGM as simple as detecting glucose in blood. After being systematically investigated, the optimum conditions of the PGM method are as follows: 5.0 min of enzymatic reaction time, 6.0 mM final concentration of ATCI solution, and 10.0 min of reaction time between ATCI/H 2 O 2 and thiocholine. Moreover, the recoveries of hydrogen peroxide in real sample spiked with three different concentrations (final concentrations of 5.0, 10.0, and 20.0 mM) are in the range of 96.3–108.4%. The recoveries of hypochlorite in real sample spiked with three different concentrations (final concentrations of 1.0, 5.0, and 10.0 mM) are in the range of 99.4–117.0%. These results indicate that the developed method can be employed for the detection of hydrogen peroxide and hypochlorite in household disinfectants.
研究领域:
分析化学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2015
·
IF 1.964
Yan Li,Bing Li,Ting Chen,Zhicheng Zhou,Jun Wang,Jun Huang
A vanadium doped graphitic carbon nitride catalyst has been prepared and used for the direct hydroxylation of arenes with O 2 . Substituted arenes with electron-withdrawing groups such as CN, NO 2 , COOH, CF 3 , and COCH 3 were oxygenated to the corresponding phenols in moderate yields. The catalyst also proved applicable for the hydroxylation of aromatic halides (F, Cl, and Br) with O 2 .
研究领域:
化学
·
催化科学
✓ 已验证
DOI
高影响因子
Chemosensors
·
2026
·Vol. 14
·期 3
·
IF 4.4
Yiyuan Zhang,Chen Zhou,Jiaxin Li,Evgeny Kovtunets
A novel acridine-based fluorescent sensor (Sensor ANT) for the highly selective and sensitive detection of cyanide ions (CN−) was rationally designed and synthesized via the conjugation reaction of acridine-9-amine with 3-nitrophenyl isothiocyanate. The sensing mechanism is triggered by the specific interaction between exogenous CN−and the hydrogen-bonding moieties within the sensor’s molecular framework, which induces a distinct fluorescence quenching response. Systematic titration experiments confirmed that Sensor ANT exhibits rapid response kinetics, excellent selectivity, and reliable qualitative/quantitative detection capabilities toward CN−. Complementary biocompatibility assays, including in vitro cellular imaging and in vivo zebrafish experiments, further verified the promising application potential of this sensor in practical and biological detection scenarios. The detection limit (DL) of Sensor ANT for CN−was calculated to be 2.89 × 10−7M, with a 1:1 binding stoichiometry and a binding constant of 1.95 × 104M−1. These findings demonstrate that Sensor ANT represents a robust candidate for CN−detection in environmental and biological systems.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2026
·Vol. 143
·期 32
·e70922
·
IF 3.1
Shaorong Zeng,Huanyu Wu,Xiaoyi Fu,Junning Gao,Zhenya Lu
Hematite (α-Fe 2 O 3 ) is a promising supercapacitor anode due to its high theoretical capacity, low cost, and eco-friendliness, yet its application is hindered by poor conductivity and structural instability. Herein, a unique Fe 2 O 3 composite encapsulated within a polyaniline-derived N, S, Cu-doped carbon layer was fabricated on carbon cloth via an integrated method involving hydrothermal growth, Cu 2+ -catalyzed electrodeposition, and carbonization. This conformal carbon sheath acts as a synergistic conductive network, mechanical buffer, and source of active sites. The optimized Fe 2 O 3 /CN electrode exhibits a high specific capacitance of 517.15 F g −1 at 1 A g −1 and dramatically enhanced cycling stability with 92.48% retention after 5000 cycles, far exceeding pure Fe 2 O 3 (51.15%). The assembled solid-state asymmetric supercapacitor (Fe 2 O 3 /CN@CC//PANI@CC) delivers an energy density of 33.82 Wh kg −1 at 737.5 W kg −1 and maintains 87.57% capacity after 5000 cycles. This work demonstrates an effective polymer-derived carbon coating strategy for developing durable, high-performance metal oxide-based electrodes.
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2022
·
IF 5.6
Xiuna Yu,Zhixiang Liu,Zhi Zhu,Hongyu Luo
A nonmetal two-dimensional carbon nitride (2D-CN) with different thickness is constructed via the facile hydrothermal (adjusting the solution pH to 4.0, 7.0 and 10.0) and calcination method. The 2D-CN-7.0 displays the dramatically enhanced photocatalytic activity (82%) for degrading 2-mercaptobenzothiazole (MBT), originating from the ultrathin 2D structural improved transfer efficiency of charge carriers, greatly decrease the diffusion path of electrons/holes to MBT, accelerating the reaction rate. More importantly, we find that there are no rules can be followed between the band gap and the thickness of CN by density functional theory (DFT) computation theoretically and experimentally. Also, the possible mechanism for the enhancement of photocatalytic performance, the degradation pathway of MBT, photogenerated carrier transfer behaviors are also discussed in depth. This research provides a new strategy to control the thickness of CN to improve photocatalytic activity.
研究领域:
材料科学
·
环境科学
·
理论化学
✓ 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）