FIBERS AND POLYMERS
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2021
·Vol. 22
·期 8
·2145-2155
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IF 2.153
Baek Na-won,Fan Xue-rong,Yuan Jiu-gang,Xu Jin,Wang Qiang
Due to the increasing importance of environmentally friendly processes, the development of monomer synthesis and its polymerization using enzymes has been investigated throughout the world. In this paper, the polymerization mechanism between silk fabrics and gallic acid (GA) in the presence of horseradish peroxidase (HRP) has been studied. The polymerization mechanism was studied in detail using UV-Vis and Fourier transform infrared spectroscopy (FT-IR), and high-performance liquid chromatography-electrospray ionization mass spectrometry (HPLC-ESI-MS) analysis. In addition, the dyeing properties and optimum reaction conditions were further investigated using the K/S values. The color fastness of the resulting silk fabrics has also been discussed. The results show that the dyeing mechanism for GA and silk fabric involved linking via the -NH 2 and -OH groups in silk fiber and the -OH groups in GA. This was probably formed via the formation of phenyl-phenyl, oxygen-phenyl, or amino-phenyl linkages. HRP significantly improved the dyeing properties of GA dyes toward silk fabrics. The optimum reaction conditions for dyeing silk fabrics have been proposed (Incubation period, 5 h; temperature, 50 °C; GA dosage, 10 mM; HRP, 6 U/ml, and H 2 O 2 , 5 mM). The color fastness of the resulting silk fabrics displayed high colorfastness in all the colorfastness tests performed.
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CELLULOSE
·
2021
·Vol. 28
·期 9
·5241-5256
·
IF 5.044
Zhou Qian,Chen JunJie,Jin Bo,Chu Shijin,Peng Rufang
MOFs are confined to solid supports to overcome their inherent disadvantages of lightweight and submicron size, which pose challenges to the adsorption operation. ZIF-8 nanoparticles can be loaded onto bacterial cellulose (BC) in a simple manner, and subsequently carbonized at 700 °C to obtain a larger specific surface area (expressed as BC@ZIF-8 carbon aerogels (BZCA). SEM indicates that ZIF-8 was successfully self-assembled on bacterial cellulose. Various characterization techniques (SEM, TEM, FT-IR, XRD, BET, and XPS) indicated that BZCA had been successfully prepared, with a large specific surface area (220.45 m 2 /g) and sufficient functional groups (-NH-, -OH, Zn–O, N–O, and C = N-). The relationship of the adsorption of BZCA to UO 2 2+ with both contact time and initial concentration was then studied. Results showed that the adsorption of UO 2 2+ followed a pseudo-second-order kinetic model (R 2 = 0.999). After calculation, the maximum adsorption capacity of BZCA was 535 mg/g, which was comparable to or better than that of other adsorbents. The kinetic analysis disclosed that 70 min was enough for BZCA to reach the adsorption equilibrium. The adsorption mechanism of the prepared adsorbent on UO 2 2+ was studied by FTIR and XPS.
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CHINESE JOURNAL OF POLYMER SCIENCE
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2021
·Vol. 39
·期 7
·887-895
·
IF 3.603
Hou Feng-Yi,Song Yi-Hu,Zheng Qiang
The reinforcement of rubbers by nanoparticles is always accompanied with enhanced dissipation of mechanical energy upon large deformations. Methods for solving the contradiction between improving reinforcement and reducing energy dissipation for rubber nanocomposites have not been well developed. Herein carbon black (CB) filled isoprene rubber (IR)/liquid isoprene rubber (LR) blend nanocomposites with similar crosslink density ( v e ) are prepared and influence of LR on the strain softening behaviors including Payne effect under large amplitude shear deformation and Mullins effect under cyclic uniaxial deformation is investigated. The introduction of LR could improve the frequency sensitivity of loss modulus and reduce critical strain amplitude for Payne effect and loss modulus at the low amplitudes. Meanwhile, tuning v e and LR content allows reducing mechanical hysteresis in Mullins effect without significant impact on the mechanical performances. The investigation is illuminating for manufacturing nanocomposite vulcanizates with balanced mechanical hysteresis and reinforcement effect.
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POLYMER BULLETIN
·
2021
·Vol. 79
·期 6
·3867-3889
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IF 2.87
Lin Xing,Chen Yuying,Jiang Jingzhe,Li Jianping,Jiang Yan,Zhang Hongwen,Liu Hongbo
A kind of polyurethane rubber (PU)/n-octadecane (n-OD)@silicon dioxide (SiO 2 )-polymethyl acrylate (PHEMA) form-stable phase change material (PCM) was fabricated in this paper. n-OD@SiO 2 -PHEMA microcapsules were prepared in one-pot, through interfacial hydrolysis polycondensation of alkoxy silanes and radical polymerization of HEMA. Then, n-OD@SiO 2 -PHEMA microcapsules were added into PU matrix to obtain PU/n-OD@SiO 2 -PHEMA composites. SiO 2 -PHEMA hybrid shell not only provides a shelter for core material, but also increases interfacial bonding between microcapsules with PU and effectively improves the mechanical properties of composites. The morphologies, chemical compositions and crystal structures of microcapsules and composites were characterized by SEM, TEM, FT-IR and XRD methods. The thermal and mechanical properties of the microcapsules and composites were characterized by differential scanning calorimetry and mechanical performance tests. The results show that the thermal and mechanical properties of PU/n-OD@SiO 2 -PHEMA composites were better than those of neat PU. The PU/n-OD@SiO 2 -PHEMA composites endow the microcapsules with improved thermal reliability and leakage proof property. The composites were found as form-stable PCM with low leakage rate. The phase change latent heat of the PU/n-OD@SiO 2 -PHEMA composites was up to 85.1 J/g and the composites can be used for thermal energy storage.
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Nature Communications
·
2021
·Vol. 12
·期 1
·1-10
·
IF 14.919
Wei Hongqiu,Lei Ming,Zhang Ping,Leng Jinsong,Zheng Zijian,Yu You
3D-printing tough conductive hydrogels (TCHs) with complex structures is still a challenging task in related fields due to their inherent contrasting multinetworks, uncontrollable and slow polymerization of conductive components. Here we report an orthogonal photochemistry-assisted printing (OPAP) strategy to make 3D TCHs in one-pot via the combination of rational visible-light-chemistry design and reliable extrusion printing technique. This orthogonal chemistry is rapid, controllable, and simultaneously achieve the photopolymerization of EDOT and phenol-coupling reaction, leading to the construction of tough hydrogels in a short time ( t gel ~30 s). As-prepared TCHs are tough, conductive, stretchable, and anti-freezing. This template-free 3D printing can process TCHs to arbitrary structures during the fabrication process. To further demonstrate the merits of this simple OPAP strategy and TCHs, 3D-printed TCHs hydrogel arrays and helical lines, as proofs-of-concept, are made to assemble high-performance pressure sensors and a temperature-responsive actuator. It is anticipated that this one-pot rapid, controllable OPAP strategy opens new horizons to tough hydrogels.
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高影响因子
Journal of Coatings Technology and Research
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2021
·Vol. 18
·期 4
·989-998
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IF 2.382
Xu Liangfeng,Wang Zhaofei,Yang Gongwen,Zhang Guobing,Wei Haibing,Fang Huagao,Ding Yunsheng
Traditional waterborne polyurethane (WPU) has poor water resistance because of the incorporation of permanent hydrophilic groups, such as carboxyl group or ammonium salt, into polymer chains. Therefore, developing WPU with excellent water resistance and mechanical properties is highly desirable for industrial applications. In this study, CO 2 -triggered hydrophobic/hydrophilic switchable waterborne polyurethane–acrylate (WPUA) containing methyl methacrylate (MMA) units were designed and synthesized. The molecular structure, hydrophobic/hydrophilic switchable behavior, water resistance, and mechanical properties were systematically investigated and characterized. The WPUA with 10 wt% MMA exhibited a low water uptake (2.15 wt%) and linear swelling ratio (0.17 L%), as well as a high tensile strength (16.7 MPa) and modulus (85.9 MPa), which were much higher than those of the pristine WPU. This study indicated that the CO 2 -triggered WPUA dispersed stably as latex particles in water and possessed excellent water resistance and mechanical properties after the film formation.
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MICROCHIMICA ACTA
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2021
·Vol. 188
·期 5
·1-8
·
IF 5.833
Sun Ying,Lin Tianran,Zeng Cuihong,Jiang Gaoyan,Zhang Xuanhan,Ye Fanggui,Zhao Shulin
A self-correcting fluorescent assay of tyrosinase (TYR) was developed by utilization of Fe-MIL-88B-NH 2 as a peroxidase-like nanozyme and a capture probe. Fe-MIL-88B-NH 2 nanozyme was selected as an electron donor, and the oxidization product (dopamine- o -quinone) acts as an energy acceptor. First, TYR catalyzes the oxidation of tyramine hydrochloride to dopamine and then to dopamine- o -quinone. Second, Fe-MIL-88B-NH 2 with intrinsic peroxidase-like activity decomposes H 2 O 2 to produce ·OH radicals, which further accelerate the oxidation of dopamine to dopamine- o -quinone. Excessive H 2 O 2 and ·OH radicals reduce the interferences from ascorbic acid at the same time providing a self-correcting ability. Dopamine- o -quinone reacts with -NH 2 groups on the ligand of Fe-MIL-88B-NH 2 through Michael reaction which results in fluorescence quenching. Under 365-nm excitation, the fluorescence emission intensity at 452 nm gradually decreased with increasing TYR concentration varying from 0 to 10 U mL −1 . The linear range is from 1 to 5 U mL −1 and the detection limit is 0.05679 U mL −1 . This self-correcting fluorescent assay of tyrosinase exhibits good sensitivity and selectivity which is also successfully applied for tyrosinase inhibitor detection. Graphical abstract
Schematic representation of fluorescent assay for tyrosinase determination based on Fe-MIL-88B-NH 2 nanozyme. A self-correcting fluorescent assay for tyrosinase was developed based on the Fe-MIL-88B-NH 2 nanozyme.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 11
·14519-14531
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IF 2.478
Yin Hongxia,Zhao Shiyi,Hao Chuncheng,Lei Qingquan
Space charge accumulation in the insulating layers of high voltage direct current cables is the key factor that leads to their degradation and limits the operation safety. Hence, it is necessary to effectively inhibit space charge injection to these layers. In this study, a new method is proposed to suppress the charge injection to cable insulation layer: a certain amount of Li 4 Ti 5 O 12 nanopowder is doped into the semiconductive screen to enhance the internal conductive network and homogenize the electric field. The influences of Li 4 Ti 5 O 12 particles in the semiconductive composite screen on the positive temperature coefficient effect and space charge injection process are explored. The obtained results reveal that the charge quantity in the insulation layer corresponding to the minimum peak resistivity is reduced by 49.7%, 58.9%, and 46.9% after polarization at a Li 4 Ti 5 O 12 content of 4 wt% and electric field strengths of 10, 20, and 30 kV/mm, respectively.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2021
·Vol. 413
·期 15
·3847-3859
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IF 4.157
Xiao Jing,Liu Zhang,Li Chunxiang,Wang Jinglun,Huang Haowen,Yi Qingfeng,Deng Keqin,Li Xiaofang
Graphdiyne (GDY) adsorbed DNA probes have been used as a fluorescent sensing platform, but topics including DNA adsorption affinities, DNA probe displacement, and fluorescence quenching ability were rarely researched. Herein, the adsorption affinity of single-stranded DNA (ssDNA) and double-stranded DNA (dsDNA) on a tremella-like GDY was tuned by modulating the surface chemistry of GDY. The fluorescence quenching ability of GDY with different oxidation degrees was compared. The nonspecific displacement of DNA probes on GDY was studied. Under the same concentrations, GDY with low oxidation degree exhibited stronger adsorption affinity and higher adsorption capacity to both ssDNA and dsDNA than highly oxidized GDY. DNA adsorbed on low-oxidized GDY was more resistant to displacement by other DNAs. Protein showed strong interaction with different GDY and could displace DNA probes on GDY. Based on these findings, an ideal GDY with proper oxidation degree, exhibiting high surface affinity for ssDNA and low affinity for dsDNA, was used as scavenger of redundant ssDNA fluorescent probe in an enzyme-assisted amplification system for sensitive ochratoxin (OTA) detection. This study has enhanced our fundamental understanding of DNA adsorption by GDY. It also provided a rational way to apply GDY for fluorescence sensing in a complicated system. Graphical abstract
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Nanoscale Research Letters
·
2021
·Vol. 16
·期 1
·1-12
·
IF 4.703
Shu Mengjun,Gao Feng,Zeng Min,Yu Chulang,Wang Xue,Huang Renhua,Yang Jianhua,Su Yanjie,Hu Nantao,Zhou Zhihua,Liu Ke,Yang Zhi,Tan Hongtao,Xu Lin
To achieve better antitumour efficacy, it is urgent to improve anticancer drug delivery efficiency in targeting cancer cells. In this work, chitosan-functionalized graphene oxide (ChrGO) nanosheets were fabricated via microwave-assisted reduction, which were employed to the intracellular delivery nanosystem for anticancer drug agent in breast cancer cells. Drug loading and release research indicated that adriamycin can be efficiently loaded on and released from the ChrGO nanosheets. Less drug release during delivery and better biocompatibility of ChrGO/adriamycin significantly improve its safety and therapeutic efficacy in HER2-overexpressing BT-474 cells. Furthermore, ChrGO/adriamycin in combination with trastuzumab exhibited synergistic antitumour activity in BT-474 cells, which demonstrated superior therapeutic efficacy compared with each drug alone. Cells treated with trastuzumab (5 μg/mL) or equivalent ChrGO/adriamycin (5 μg/mL) each elicited 54.5% and 59.5% cell death, respectively, while the combination treatment with trastuzumab and ChrGO/adriamycin resulted in a dramatic 88.5% cell death. The dual-targeted therapy displayed higher apoptosis, indicating superior therapeutic efficacy due to the presence of different mechanisms of action. The combined treatment of ChrGO/adriamycin and trastuzumab in BT-474 cells induced cell cycle arrest and apoptosis, which ultimately led to the death of augmented cancer cells. This work has provided a facile microwave-assisted fabrication of ChrGO as a controlled and targeted intracellular drug delivery nanosystem, which is expected to be a novel promising therapy for treating HER2-overexpressing breast cancer cells.
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Scientific Reports
·
2021
·Vol. 11
·期 1
·1-16
·
IF 4.38
Chen Zhiqiang,Wang Yanhong,Luo Liqun,Peng Tiefeng,Guo Feng,Zheng Mingyu
Separation effects of sodium polyacrylate (PAAS) and gum Arabic (GA) on flotation of chalcopyrite and magnesium silicate minerals using potassium butyl xanthate (PBX) as collector were investigated by micro-flotation experiments, zeta potential, Infrared spectral (IR), SEM–EDS, XPS analysis and copper sulphide ore beneficiation test. The micro-flotation experiments and zeta potential measurements showed that combined depressant consisting of PAAS and GA could efficiently reduce the recoveries of mixed minerals of serpentine and talc more than 25%, while that of chalcopyrite remained above 70% at pH 9.2. Infrared spectral (IR), SEM–EDS and XPS analysis showed that PAAS chemically reacted with Mg on the surface of serpentine, while GA adsorbed on talc surface mainly via physical interaction and hydrogen bond may also play a role. Surface synergism between PAAS and GA was investigated by turbidity test and its depression mechanism was proposed. The technology feasibility of using PAAS and GA to improve the copper sulphide ore flotation performance was verified through artificial mixed ore flotation and laboratory closed-flotation operation.
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POLYMER BULLETIN
·
2021
·Vol. 79
·期 6
·4323-4337
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IF 2.87
Cao Mengjing,Cai Qiang,Guo Guangfan,Guo Hong,Chen Yingchao,Zhang Yuping
Polymer microsphere profile control is a promising approach for the profile control of heterogeneous reservoirs. Matching between polymer microspheres after swelling in water and the reservoir pore throat is crucial for profile control. Hydration equilibrium time and swelling ratio are key properties that are a direct result of water shutoff efficacy. In this paper, a hollow structure microsphere with swelling–deswelling properties is synthesized and its physical properties including morphology, particle size distribution, water swelling property and deswelling property are thoroughly examined. Meanwhile, the displacement performances are studied. The results demonstrate that the hollow structure microspheres have good swelling–deswelling properties at different salt concentrations. Compared with two kinds of polymer microspheres with the same material, the hydration equilibrium time of hollow structure microspheres is longer than that of nonhollow polymer microspheres. Moreover, the hollow structure microspheres have an effect on deep plugging. With the hydration time increasing, the tertiary recovery of the hollow structure microspheres solution is higher than that of nonhollow polymer microspheres solution, whether in a homogeneous medium or in a heterogeneous medium.
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