JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 36
·17255-17265
·
IF 3.553
Huang Jinxin,Zhang Wei,Li Heng,Yu Xiaogang,Ding Shuaiwen,Wu Chengwei
Biocompatible polydopamine–polyacrylamide (PDA–PAM) hydrogel has good self-healing performance. However, there is a trade-off between the self-healing ability and the mechanical strength. Excellent self-healing often results in the poor mechanical strength, which limits the application in load-bearing field. Here, we successfully prepare PDA–PAM hydrogels with improved strength and good self-healing properties simultaneously. By adjusting the pH and ammonium persulfate (APS) content of the hydrogel solution to promote dopamine (DA) polymerization, PDA–PAM hydrogel with a high content of polydopamine (PDA) is developed, which demonstrates excellent self-healing properties and mechanical strength. In particular, the PDA–PAM hydrogel with high PDA content (DA/AM = 5%) has a tensile strength of 16 kPa and the tensile strength spontaneously recovers 96% in 2 h after the tensile fracture. The obtained hydrogel also displays good biocompatibility.
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高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 10
·1-9
·
IF 6.232
Wei Shengnan,Li Juan,He Jingya,Zhao Wei,Wang Feng,Song Xiuling,Xu Kun,Wang Juan,Zhao Chao
A rapid and sensitive colorimetric assay is described for Salmonella typhimurium ( S. typhimurium ) detection using urea/phenol red impregnated test paper. Aptamer-modified Fe 3 O 4 @Ag multifunctional hybrid nanoprobes (apt-Fe 3 O 4 @Ag NPs) were used to specifically captured S. typhimurium ; the nanoprobes were quickly etched by H 2 O 2 to form Ag + . The generated Ag + can inhibit the urease-catalyzed hydrolysis reaction of urea to produce NH 4 + . Consequently, the as-prepared test paper displayed a yellow color. In the presence of S. typhimurium , the target bacteria can cause aggregation of apt-Fe 3 O 4 @Ag NPs, and the deposited Ag on the nanoprobe’s surface is shielded against H 2 O 2 -induced oxidative decomposition leading to reduced Ag + production. The catalytic activity of urease cannot be inhibited completely by inadequate amount of Ag + . An obvious color change from yellow to pink can be monitored directly using our test paper as a result of increased NH 4 + . The entire assay procedure could be completed within 1 h. A limit of detection of 48 cfu/mL is achieved with a linear range of 1 × 10 2 to 1 × 10 6 cfu/mL. The recoveries of S. typhimurium spiked in pure milk samples were 92.48–94.05%.
Schematic diagram of the proposed colorimetric assay for S. typhimurium detection based on etching of bifunctional apt-Fe 3 O 4 @Ag NPs and inhibiting catalytic activity of urease by Ag + . A color change from yellow to pink can be observed and correlated to the concentration of S. typhimurium.
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高影响因子
JOURNAL OF FLUORESCENCE
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2020
·Vol. 30
·期 6
·1491-1498
·
IF 2.093
Zhang Yuanyuan,Xu Hedan,Chen Yan,You Xiaoshuang,Pu Yunxun,Xu Wenfeng,Liao Xiaoling
Gold nanoclusters (AuNCs) stabilized by glutathione (GSH) have been synthesized using a simple one-pot method, which were used as a fluorescence-enhanced probe for the detection of cysteine (Cys) and GSH. The detection is based on the finding that the weak yellow fluorescence of the AuNCs, with excitation/emission maxima of 430/600 nm, can be enhanced by Cys and GSH via NCs aggregation. This method is selective for Cys and GSH. According to the fluorescence enhancement, the detection ranges of AuNCs for Cys and GSH are 2.49 µM ~ 0.80 mM and 1.99 µM ~ 0.44 mM, with the detection limit of 0.42 µM and 0.27 µM, respectively. In addition, the probe has good anti-interference performance over other common biomolecules. Importantly, the probe is successfully used for the determination of Cys in human serum samples, displaying the potential application of the probe in the detection of biological sulfhydryl molecules in actual samples.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 5
·4034-4050
·
IF 3.553
Cheng Shuaishuai,Duan Xiaoyuan,Zhang Zhiyi,An Dong,Zhao Guizhe,Liu Yaqing
Owing to its remarkable electrical, mechanical and thermal properties, graphene has been considered the most promising reinforcing filler for the development of rubber nanocomposites. In this work, a novel interfacial structure consisting of reduced graphene oxide (rGO)/N-tert-butyl-2-benzothiazole sulfonamide (NS)/natural rubber (NR) (NR/NS-rGO) with covalent bond connections was fabricated using one-step modification and coprecipitation methods. When the filler loading of NS-rGO is 0.42 vol.%, not only the thermal conductivity of the rubber composite increases to 0.237 Wm −1 K −1 , which is 21.5% higher than that of pure NR; meanwhile, the internal heat generation decreases to 2.6 °C, which is 45.8% lower than that of reduced graphene oxide (rGO)/ascorbic acid (VC)/natural rubber (NR) (NR/VC-rGO), and the mechanical properties have been greatly improved. The results demonstrated that the covalent bond connections greatly reduced interfacial thermal resistance at the filler/matrix interface. Furthermore, the enhanced interfacial interaction reduced frictional heat generation at the filler/matrix interface. More importantly, this strategy provided creative insights into the high application potential of graphene in the rubber industry.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 9
·5786-5801
·
IF 4.22
Chen Yan,Li Xuebin,Gao Junkai,Yang Mouyuan,Liu Yi,Liu Yu,Tang Xi
An efficient shape-stabilized phase change material (PEG/CLMS) with improved thermal properties was prepared using carbon layer-modified mesoporous silica (CLMS) as the supporter of polyethylene glycol (PEG). The CLMS was fabricated based on dopamine biomimetic modification, which is facile, environmentally friendly and easy to use. The physical properties and chemical compatibility of PEG/CLMS were studied, and the results show that after the SBA-15 was modified by carbon layer, the phase change enthalpy of PEG/CLMS-b increased from 112.0 J/g to 129.9 J/g and the thermal conductivity increased from 0.34 W/(m·K) to 0.43 W/(m·K). Moreover, the PEG/CLMS-b had favourable thermostability and thermal reliability. The carbon layer modification method reported in this paper has great potential in practical applications for thermal energy storage. The thermal property improvement method developed in this study could also be used for shape-stabilized phase change materials (ssPCMs) prepared using other carriers such as diatomite and palygorskite. Therefore, a universal method was developed to improve the thermal properties of ssPCMs in this study. Graphical abstract
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BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2020
·Vol. 44
·期 4
·727-735
·
IF 2.419
Wang Hongrao,Han Shuran,Wang Jiayi,Yu Shuyu,Li Xiaoyan,Lu Lei
Laccases are versatile oxidases that are capable of decolorizing various synthetic dyes. Recombinant Bacillus amyloliquefaciens laccase was immobilized as magnetic cross-linked enzyme aggregates (M-CLEAs) for application in dye decolorization. Several parameters influencing the activity recovery were evaluated during the synthesis of M-CLEAs. With ammonium sulfate as precipitant, maximum activity was recovered by cross-linking with 0.16% glutaraldehyde for 1 h. The prepared M-CLEAs exhibited improved activity under alkaline conditions. It remained 74% activity after incubation at 60 °C for 5 h. Enhanced tolerance towards NaCl was also observed for the M-CLEAs, with 68% activity remaining in the presence of 1 M NaCl. The immobilized laccase could rapidly decolorize more than 93% of reactive black 5 and indigo carmine in 1 h, while its catalytic efficiency towards reactive blue 19 was relatively low. After four cycles of consecutive reuse, the M-CLEAs could decolorize 92% of indigo carmine. The easy recovery and reusability of M-CLEAs facilitate the potential application of bacterial laccase in dye decolorization.
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高影响因子
CELLULOSE
·
2020
·Vol. 28
·期 1
·301-316
·
IF 4.21
Yang Cong,Yuan Jun,Guo Yi,Luo Xiaogang
In this work, Mg/Al layered double hydroxides embedded phosphorylated cellulose microspheres (Mg/Al LDH@PCMs) were prepared first with solid-phase phosphorylation on CMs then in situ nano-assembly between Mg 2+ , Al 3+ and phosphate groups. Hence the synthesis degree of Mg/Al LDH was enhanced. The obtained Mg/Al LDH@PCMs were characterized by scanning electron microscopy (SEM), specific surface area test (BET), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), ζ potential, X-ray electron energy (XPS). The novel in situ nano-assembly method provided improved Mg/Al LDH load without compromising the porous structure of CMs, making Mg/Al LDH@PCMs suitable for water treatment. The Mg/Al LDH@PCMs adsorbed tetracycline hydrochloride (TC) with a kinetic pattern of pseudo second-order kinetic model, while isothermally fitted with the Freundlich isotherm model. The maximum theory adsorption capacity of Mg/Al LDH@PCMs q m was 25.107 mg g −1 with the Gibbs free energy ∆G = 7.523 kJ mol −1 under 298 K. The TC removal mechanism was deeply investigated via characterization results and also the batch experimental results, it was inferred that electrostatic attraction between LDH particles and the anion species mainly dominated the adsorption process. These properties make Mg/Al LDH@PCMs have a wide application prospect in the water purification field.
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高影响因子
POLYMER BULLETIN
·
2020
·Vol. 78
·期 10
·5963-5976
·
IF 2.014
Gu Nianliang,Zhang Haiyan,Ge Heyi,Wang Feifei,Liu Bomin
We report a method of in-situ modification of phenolic resin (PR) on improving thermal stability with graphene/SiO 2 hybrids at an ultralow filler loading. GO/SiO 2 hybrids were prepared by electrostatic adsorption method and chemically reduced to RGO/SiO 2 hybrids by NaBH 4 . The effect of in-situ modification of PR by GO/SiO 2 and RGO/SiO 2 on thermal stability of PR was studied. The results of SEM, XRD and FTIR showed that the hybrids and in-situ polymerization had a significant effect on improving the thermal property of PR. The TG and DTG analyses demonstrated that the thermal performance of PR in 350–500 °C was improved prominently. The T 5% and T 10% of 0.1 wt% (RGO–SiO 2 )/PR were increased by 165.56 °C and 89.23 °C compared with the pure PR, reaching 381.77 °C and 466.20 °C, respectively. Moreover, the R 800°C of 0.1 wt% (GO–SiO 2 )/PR and 0.1 wt% (RGO–SiO 2 )/PR reached 69.86 wt% and 70.20 wt%, which increased by 10.75% and 11.29%, respectively, compared with pure PR. Therefore, the application of graphene/SiO 2 hybrids in the in-situ polymerization modification of PR can significantly improve the thermal stability of PR and broaden its application fields.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2020
·Vol. 47
·期 2
·663-682
·
IF 2.262
Zhu Lin,Zheng Xingwen,Zeng Xianguang,Gong Min,Guo Lei
The inhibitive effect and inhibition mechanism of l -lysine derivatives, namely α- N -benzyloxycarbonyl- l -lysine (α-NL) and ε- N -benzyloxycarbonyl- l -lysine (ε-NL), on the corrosion of carbon steel in 0.5 M H 2 SO 4 solution were investigated by electrochemical technique, weightlessness test, scanning electron microscope, atomic force microscope, infrared attenuated reflectance spectroscopy and quantum chemical calculation. The results showed that α-NL and ε-NL as moderate cathodic inhibitors mainly inhibited the cathodic reaction of carbon steel in 0.5 M H 2 SO 4 solution, and the terminal substituted ε-NL showed better corrosion inhibition than the α- N -benzyloxycarbonyl protected α-NL. Their inhibition efficiencies increased with the increase in inhibitor concentration, and the inhibition efficiency of α-NL and ε-NL with concentration of 10 mmol can reach 53.4% and 61.5%, respectively, but decreased with rising temperature. The adsorption of investigated inhibitors on the surface of carbon steel obeyed the modified Langmuir isotherm and El-Awady thermodynamic-kinetic model, and the thermodynamic and kinetic parameters were determined to discuss the mechanism of inhibition of α-NL and ε-NL. Moreover, Quantum chemical calculation gave further insight into the inhibition mechanism of α-NL and ε-NL and was employed to reveal the reasons for their differences in inhibition performance.
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高影响因子
COLLOID AND POLYMER SCIENCE
·
2020
·Vol. 298
·期 12
·1715-1727
·
IF 1.536
Lu Yifei,Shao Jia,Wang Sui,Guo Zhiyong,Hu Yufang
The development of tenacity photoluminescent (PL) hydrogels is very great significance to promote the application of optical technology in hydrogel. Herein, we report a high-toughness PL hydrogel that combines synthetic hydrophilic lanthanide complex (LCs) and tannic acid (TA) with polyvinyl alcohol (PVA) by frozen-thawing. The resulting hydrogel has high mechanical strength (1194.46-kPa tensile strength, 1266.17-kJ m −3 toughness energy, 1915.58-kPa compressive strength, and 269.79-kJ m −3 energy dissipation at 80% compression), excellent self-recover and anti-fatigue performance, good photoluminescence, and switchable functions under UV light, showing red (254 nm) and green (365 nm), respectively. The design strategy offers a new approach for the preparation of multifunctional and tenacity PL hydrogels.
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高影响因子
Applied Nanoscience
·
2020
·Vol. 11
·期 1
·257-266
·
IF 2.88
Qu Jiaying,Mukerabigwi Jean Felix,Yang Nianshun,Huang Xueying,Sun Yuyang,Cai Xiaojuan,Cao Yu
The nanodiamond (ND) particles have several potential applications including tribology, drug delivery, bioimaging, etc. However, the severe colloidal aggregation tendency of ND particles strictly limits its exploitation. Moreover, due to NDs rich surface chemistry and relatively small size, it is still difficult to separate these large ND particles using conventional separation methods. Herein, we develop an efficient and straightforward strategy to separate the colloidal aminated nanodiamonds (ND-NH 2 ) into small size nanoparticles by viscosity gradient centrifugation method in a polyvinylpyrrolidone (PVP) aqueous solution. Prior to and after separation, the pristine ND and ND-NH 2 particles size and morphology were characterized by DLS (dynamic light scattering analyzer) and TEM (transmission electron microscopic), which show that ND particles with narrow size distribution and uniform morphology can be easily separated by the viscosity gradient of PVP aqueous solution. This simple, rapid and effective separation method could be extended to separate other functionalized NDs with different sizes.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 9
·1-11
·
IF 6.232
Tang Tingting,Yang Fan,Wang Lina,Zhao Chunxin,Nie Fei,GuopingYang
An ultrasensitive sandwich electrochemiluminescence (ECL) biosensor was designed for determination of concanavalin A (ConA) through the specific carbohydrate-ConA interactions. Three-dimensional porous metal-organic framework (Zn-MOF) was synthesized, which loaded a large amount of luminescent reagents as luminol by encapsulating into its pores to form Zn-MOF@luminol complex. Interestingly, Zn-MOF also acted as the coreactant accelerator in the luminol-H 2 O 2 ECL system. This Zn-MOF@luminol complex was used as the signal probe to achieve a super strong and stable ECL signal. In addition, three-dimensional hierarchical molybdenum disulfide nanoflower and multiwalled carbon nanotubes complex (MoS 2 NF@MWCNTs) with peroxidase-mimicking enzyme property were used as a substrate to modify the glassy carbon electrode to further enhance the ECL signal of luminol by promoting decomposition of H 2 O 2 into reactive oxygen species (ROSs). In addition to the horseradish peroxidase (HRP) catalysis effect on the luminol ECL signal, a triple amplified ConA sandwich ECL sensor with high sensitivity sensor was constructed. The linear range for ConA detection was from 0.5 pg/mL to 100 ng/mL with a detection limit of 0.3 pg/mL ( S / N = 3). The recovery test for ConA in human serum samples was performed with satisfactory results.
Graphical abstract
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高影响因子
危险品化学品经营许可证（带存储）