JOURNAL OF POLYMER RESEARCH
·
2012
·Vol. 19
·期 11
·1-7
·
IF 1.733
Yu Wei-Na,Liu Shou-Xin,Wang Hong-Mei,Tian Rong
Temperature-responsive P(NIPAM- co -HMAM)- b -PEO- b -P(NIPAM- co -HMAM) triblock copolymers were synthesized by an atomic transfer radical polymerization (ATRP) method without freeze–pump–thaw cycles. The composition, structure, and molecular weight of the synthesized block copolymer were characterized by 1 H NMR and GPC. The phase transitions induced by temperature for different copolymers in dilute aqueous solutions have been studied using transmittance measurements, laser particle size measurements, viscosity analysis, and surface tension measurement, which showed that the HMAM content and the PEO (or PEG) chain length in the synthesized triblock copolymer affects the copolymer’s lower critical solution temperature (LCST). The micellization behavior of each temperature-responsive triblock copolymer was investigated by fluorescence probe measurements and transmission electron microscopy (TEM), which showed that the triblock copolymers form stable micelles above the LCST. The introduction of the HMAM component and the formation of micelles represent the first steps in the development of an injectable gel that forms in situ through chemical and physical crosslinking.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 11
·7164-7170
·
IF 2.1
Li Yingxiang,Liang Deyin,Zhang Xing,Xiong Zhe,Tang Bin,Si Feng,Fang Zixuan,Li Hao,Shi Zitao,Chen Jingjing
This study presents the dielectric properties of Ba 2 Zr 2 Si 3 O 12 ceramics, synthesized using the solid state method. The cubic crystal structure of Ba 2 Zr 2 Si 3 O 12 ceramics was conclusively verified through the analysis of XRD patterns and subsequent structural refinement. Refined lattice parameters of a = b = c = 10.23178 Å were found, with a corresponding unit cell volume of V = 1071.159026 Å 3 . The grain microstructure of the ceramics was characterized using SEM, which showed density of 97.6% for the Ba 2 Zr 2 Si 3 O 12 ceramic. The Si-O bond valences ( V Si-O ) were found to be closely related to the τ f of the Ba 2 Zr 2 Si 3 O 12 ceramics. The microwave dielectric properties of the Ba 2 Zr 2 Si 3 O 12 ceramics sintered at 1490°C were ascertained to be ε r = 15.08, Q × f = 14885 GHz ( f = 9.9 GHz), and τ f = −78.6 ppm/°C.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2019
·Vol. 26
·期 4
·1-11
·
IF 1.53
Yang Zhouxiaoshuang,Wang Feng,Liu Hui
With the spiropyran-containing compound as the initiator, dual responsive spiropyran-ended poly(N-vinyl caprolactam) (SP-PNVCL) was synthesized by atom transfer radical polymerization. The structure of the resulting polymer was characterized by 1 H NMR and gel permeation chromatography, and the polymer had both reversible light-responsive and thermo-sensitive behaviors. Metal ions could be bound between merocyanine formed by photoisomerization of spiropyran and the amino group of N-vinyl caprolactam unit through synergetic coordination. The complexation of SP-PNVCL with several metal ions was investigated by UV-Vis absorption spectroscopy, and it was found that SP-PNVCL might be used as a potential recognition probe for Fe 2+ , accompanied by obvious color change from colorless to brown by naked eye. The detection limit and photo-reversible recyclable behaviors of SP-PNVCL for Fe 2+ were also investigated in details. The kind of spiropyran-ended poly(N-vinyl caprolactam) had great application potential in environment protection and biological area.
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高影响因子
Food Analytical Methods
·
2023
·Vol. 16
·期 9
·1477-1486
·
IF 2.9
Liu Lei,Zhao Binyu,Luo Xiaogang,Meng Lingkui,Wu Fengshou
Porous organic polymers (POPs) are a class of materials that combine the properties of both polymers and porosity. They are characterized by their network structure composed of repeating organic units, which form pores or cavities throughout the material. Owing to their unique features including tunable porosity, abundant accessible active sites and synthetically control ability, POPs have been widely employed in the fields of catalysis, adsorption, and biomedicine. The incorporation of porphyrin building units into POPs endows POPs with unique structural characteristics and excellent optical properties. In this work, the aldehyde porphyrin with polyethylene glycol chain was successfully synthesized with good hydrophilicity, which was then reacted with tetrakis(4-aminophenyl) methane to construct the porphyrin-based porous organic polymers. The porphyrin-based POPs was then metallized to yield iron-containing porous organic polymers (Fe-POPs), which could catalyze the transformation of colorless substrate (3,3′,5,5′-tetramethylbenzidine (TMB)) to a blue product (ox-TMB) in the presence of hydrogen peroxide (H 2 O 2 ). Upon the addition of the ascorbic acid (AA) to the aforementioned system, the blue solution faded gradually to colorless. Based on this phenomenon, a rapid and sensitive colorimetric assay for the measurement of H 2 O 2 and AA was developed using Fe-POPs as mimetic enzyme. Fe-POPs was then successfully applied in real samples to detect AA with high accuracy. As a potential peroxidase mimic, Fe-POPs demonstrated the benefits of excellent stability and catalytic efficiency, which presented the promising application in the area of biocatalysis and biosensing. Graphical
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高影响因子
TRANSITION METAL CHEMISTRY
·
2023
·Vol. 48
·期 1
·55-61
·
IF 1.7
Yang Yu-Meng,Feng Chao,Jiang Yun-Hua,Du Dao-Hang,Zhao Hong,Zhang Guo-Ning,Wang Yu-Cheng
Rigid, dicarboxylic acid ligand 5-(4-carboxyphenyl)-1 H -pyrazole-3-carboxylic acid (H 3 L) has been synthesized and utilized for assembling a metal organic framework [Pb 2 (HL) 2 ] n through the hydrothermal technique. The target complex has been described by single-crystal X-ray diffraction, powder X-ray diffraction measurement, elemental analysis and infrared spectroscopy, and proved to be a structurally novel 3D complex. The central metal ions Pb(II) of complex 1 are coordinated to the carboxyl oxygen atoms, possessing two different coordination modes, heptacoordination and octacoordination. In the case of topology, complex 1 exhibits a net topological structure of 2,3,9-c with Schläfi symbol of {3·5 2 }{3 2 ·4 4 ·5 12 ·6 14 ·7 2 ·8 2 }{5}. The optical properties have been undertaken at room temperature, showing attractive luminescence behavior. Moreover, the electrochemiluminescent intensity of complex 1 can reach up to 1056 a.u. and maintain relatively stable after eight cycles, which could further provide ideas for building organic light-emitting diodes (OLEDs) constructed with a more affordable metal center.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2024
·Vol. 18
·期 4
·1-15
·
IF 4.3
Guo Yunyu,Wang Yiran,Shao Yuewen,Zhang Shu,Wang Yi,Hu Song,Xiang Jun,Hu Xun
During steam reforming, the performance of a catalyst and amount/property of coke are closely related to reaction intermediates reaching surface of a catalyst. Herein, modification of reaction intermediates by placing Mg-Al-hydrotalcite above Ni/KIT-6 catalyst in steam reforming of glycerol was conducted at 300 to 600 °C. The results revealed that the catalytic activity of Ni/KIT-6 in the lower bed was enhanced with either Mg 1 -Al 5 -hydrotalcite (containing more acidic sites) or Mg 5 -Al 1 -hydrotalcite (containing more alkaline sites) as upper-layer catalyst. The in situ infrared characterization of steam reforming demonstrated that Mg-Al-hydrotalcite catalyzed the deoxygenation of glycerol, facilitating the reforming of the partially deoxygenated intermediates over Ni/KIT-6. Mg-Al-hydrotalcite as protective catalyst, however, did not protect the Ni/KIT-6 from formation of more coke. Nonetheless, this did not lead to further deactivation of Ni/KIT-6 while Mg 5 -Al 1 -hydrotalcite even substantially enhanced the catalytic stability, even though the coke was much more significant than that in the use of single Ni/KIT-6 (52.7% vs. 28.6%). The reason beneath this was change of the property of coke from more aliphatic to more aromatic. Mg 5 -Al 1 -hydrotalcite catalyzed dehydration of glycerol, producing dominantly reaction intermediates bearing C=C, which formed the catalytic coke of with carbon nanotube as the main form with smooth outer walls as well as higher aromaticity, C/H ratio, crystallinity, crystal carbon size, thermal stability, and resistivity toward oxidation on Ni/KIT-6 in the lower bed. In comparison, the abundance of acidic sites on Mg 1 -Al 5 -hydrotalcite catalyzed the formation of more oxygen-containing species, leading to the formation of carbon nanotubes of rough surface on Ni/KIT-6.
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高影响因子
RARE METALS
·
2024
·Vol. 43
·期 6
·2739-2746
·
IF 9.6
Xie Yong-Shuai,Cheng Yuan,Lyu Yang,Li Rui,Han Jie-Cai
Based on the fact that it is challenging for the polymer flexible circuit substrates to meet the requirements of serving in high-temperature environments, this work proposed the idea of using printable ceramic fiber paper as a high-temperature flexible circuit substrate. A ceramic fiber paper with all ceramic components had been developed via electrospinning, solving the problems of low strength and severe strength drop at high temperatures of traditional ceramic fiber paper. The tensile strength of the prepared ceramic fiber paper is 2.63 MPa, and the reliable service temperature is 1200 °C. Its bulk density is about 1.5 times that of traditional ceramic fiber paper. It can be printed with patterns by commercial inkjet printers like ordinary printing paper and has excellent printability. The feasibility of ceramic fiber paper as a flexible circuit substrate was verified by constructing a simple circuit. When the fiber paper is significantly bent, the circuit still forms a complete path, which proves that it has a strong application potential for high-temperature flexible circuit substrate and is expected to promote the development of flexible electronic devices serving at extreme high-temperature environments. Graphical abstract
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高影响因子
JOURNAL OF FLUORESCENCE
·
2023
·Vol. 33
·期 5
·2075-2084
·
IF 2.7
Chen Ting,Ge Zicheng,Fang Min,Zhu Weiju,Li Cun
In this paper, a novel amino acid surface-functionalized semiconductor CdTe quantum dot fluorescent probe amidated by carboxyl and amide groups was synthesized to detect pyrophosphate ions (P 2 O 7 4− , PPi). L-Arginine (L-Arg) was grafted onto cysteine modified CdTe quantum dots (Mea-CdTe QDs) to form a new L-Arginine-functionalized quantum dot fluorescent probe (L-Arg@Mea-CdTe). The prepared probe has good optical properties with multiple grafted functional groups on the surface. The guanidine group of the L-Arg@Mea-CdTe fluorescent probe is strongly basic and will be fully protonated under physiological conditions. The resulting hydrogen bonds bound to pyrophosphate lead to significant changes in the fluorescence of CdTe quantum dots. IR and XPS characterization were performed to confirm it. The addition of PPi induces a significant fluorescence quenching of L-Arg@Mea-CdTe in aqueous solution. The fluorescent QDs probe can also detect pyrophosphate with good sensitivity and anti-interference performance. The detection limit of the L-Arg@Mea-CdTe fluorescence probe for PPi is as low as 0.30 μM. In addition, the novel nano-fluorescent probe was successfully applied to detect PPi in water and in cell imaging.
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高影响因子
EUROPEAN JOURNAL OF MEDICAL RESEARCH
·
2024
·Vol. 29
·期 1
·1-10
·
IF 2.8
Liu Jianlong,Tian Qingxin,Zhang Mingxiao
Myocardial Infarction (MI) is major cause of heart failure, highlighting the critical need for effective therapeutic strategies to improve cardiac repair. This study investigated the cardioprotective effects of VX765-coated polyethyleneimine (PEI)/sodium alginate (AG) composite nanogels (AG/PEI-VX765 NGs) in a rat model of MI. Additionally, AG-VX765 NGs and PEI-VX765 nanospheres (NPs) were synthesized and tested to compare their efficacy. MI was caused in rats by ligating the left anterior descending branch of the coronary artery, and the rats were grouped and set as Sham, MI, MI + VX765, MI + AG-VX765NGs, MI + PEI-VX765NPs, and MI + AG/PEI-VX765NGs. Results demonstrate that AG/PEI-VX765NGs were non-toxic and exhibited a sustained release of VX765. In vivo, experiments demonstrated that all treatment groups significantly enhanced cardiac function, reduced infarct size, fibrosis, and apoptosis in rats with MI, with the MI + AG/PEI-VX765NGs group exhibiting the most favorable outcomes. Our findings indicate that AG/PEI-VX765NGs represent a promising therapeutic approach for MI treatment.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 8
·1-12
·
IF 2.8
Wang Junjun,Xue Lin,Zhang Lei,Ruan Zhen,Hua Wanren
In this work, Sn-loaded α -Fe 2 O 3 nanosheets were made using a straightforward solvothermal technique and utilized for acetone detection. The materials’ structural and chemical characteristics were evaluated using XRD, SEM, BET, and XPS. By varying the quantity of Sn, various constitutions could be created, and the associated sensing mechanism was addressed. The sample containing the 3 at.% Sn has good sensing performance. Acetone responds at a lower working temperature (225 °C), reaching 6.7–100 ppm. It has a splendid response time (5 s) and a sensor with better repeatability and stability. All of these phenomena suggest that Sn improves both the surface’s ability to adsorb sensitive materials and its sensitivity to the target gas. Sn will enhance the surface area specifically and promote the adsorption and redox reaction of the gas. As a result, the sensor offers significant possibilities for acetone detection.
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高影响因子
IONICS
·
2023
·Vol. 30
·期 2
·1089-1100
·
IF 2.8
Zhao Jifan,Lu Zhenyong,Wang Yue,Mário Baptista José Laurindo,Wang Shaoyan
Cellulose, which is one of the main components of wood biomass, was carbonized and activated by KOH to prepare a hierarchical porous carbon. This biomass derived carbon was successfully utilized as an effective sensor’s material for simultaneously determine hydroquinone (HQ) and catechol (CC) through cyclic voltammetry and amperometry techniques. The resulting sensor exhibited wide linear ranges for HQ (0.5–3000 μmol/L) and CC (1–3000 μmol/L), with the detection limits of HQ (0.47 μmol/L) and CC (0.4 μmol/L) by amperometry technique, respectively. In addition, the prepared sensor also possesses good performances including specific selectivity, long lifetime and good applicability. The practical application in domestic lake water samples with satisfied recoveries implies the proposed sensor is promising. These results demonstrate that cellulose containing biomass have potential as an effective precursor of porous carbon materials and are applicable on various electrochemical sensors.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 13
·20621-20636
·
IF 0
Yin Bingjie,Li Jingying,Guo Wei,Dong Haoqing,Zhang Guangshan,Xin Yanjun,Zhang Guodong,Chen Qinghua
Polycyclic aromatic hydrocarbons (PAHs) in soil are potentially harmful to human health. However, the use of photocatalysis technology to treat soil contaminated with PAHs remains challenging. Therefore, TiO 2 /α-FeOOH composite photocatalyst has been synthesized by hydrothermal method and sol–gel method and applied to photocatalytic degradation of fluoranthene in soil. The morphology, elements, crystal structure, optical properties, electrochemical characteristics, and photocatalytic activity of TiO 2 /α-FeOOH have been characterized. Results showed that TiO 2 is tightly fixed on the surface of α-FeOOH, and TiO 2 /α-FeOOH had higher photocatalytic activity on photocatalytic degradation of fluoranthene in soil under simulated sunlight. The degradation efficiency of TiO 2 /α-FeOOH is 3.0 and 4.8 times higher than that of TiO 2 and α-FeOOH, respectively. This is attributed to enhanced photocatalytic ability by enhancing the transfer capacity of electrons and holes and broadening the spectrum absorption range. The highest degradation efficiency was achieved when the pH of the soil is neutral, the ratio of water/soil is 10:1, and the dosage of catalyst is 50 mg/g. In addition, it was proved that •O 2 − , h + , and 1 O 2 are the main active substances in the photocatalysis of TiO 2 /α-FeOOH. The possible mechanism of a Z-type electron transfer structure was also proposed. The degradation products of fluoranthene were detected, and the degradation pathway was deduced.
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