FIBERS AND POLYMERS
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2020
·Vol. 21
·期 7
·1550-1559
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IF 1.797
Mahmud Sakil,Long Yu,Abu Taher Muhammad,Hu Han,Zhang Ruoyu,Zhu Jin
Poly(butylene 2,5-furandicarboxylate) (PBF) derived from 2,5-furandicarboxylic acid (FDCA) is an emerging bio-based alipharomatic polyester that is expected to replace its fossil-based terephthalate and naphthate homologues. PBF holds excellent gas barrier properties, but its slow rate of crystallization might restrict wider applications. To improve the rate of crystalization, it was melt-blended with crystalline micro-cellulose (CMC) to prepare a composite through twin-screw extrusion. To ensure environmental friendly conditions, neither chemicals to modify fibers nor compatibilizers to improve the filler/matrix interaction were used. Size exclusion chromatography (SEC), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermo-gravimetric analysis (TGA) and X-ray diffraction (XRD) were used to characterize the composite. It was observed that a longer blending duration (cyclic mode) leads to a greater reduction in molecular weight (Mw) in the presence of CMC, which can be avoided by using a shorter blending duration (direct mode). The mechanical properties of the composite showed an increase in Young’s modulus by approximately 23 % and 36 % with respect to reference PBF for the cyclic and direct mode respectively. It was further observed that, although the elongation at break and tensile strength has decreased, it has improved gas barrier properties. Thermal analysis shows faster nucleation of PBF in the presence of CMC with a minor effect on its thermal degradation.
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MATERIALS AND STRUCTURES
·
2021
·Vol. 54
·期 1
·1-16
·
IF 3.428
Ding Gongying,Yu Xin,Si JingJing,Mei Jie,Wang Junyan,Chen Bei
A novel compatibilizer epoxy soybean oil (ESO)/nano-silica was synthesized, and used to improve the compatibility between the resin (epoxy and curing agent) and asphalt to prepare cold-mixed epoxy asphalt (CMEA). The ESO/nano-silica was characterized by FTIR, x-ray photoelectron spectroscopy, fluorescence microscopy and DSC. The results indicated that the ESO reacted with nano-silica and Si–O–C bonds formed, revealing that the nano-silica was successfully modified by ESO. Meanwhile, the incorporation of ESO/nano-silica into CMEA could significantly enhance the compatibility between resin and asphalt, and the tensile strength, elongation at break and tensile toughness of CMEA was obviously increased. The compatibility between resin and asphalt was simulated by molecular dynamic simulation. The simulation results showed a good correlation with the experimental results. The solubility parameter could be a feasible indicator to differentiate the compatibility variation. The Van Der Waals contributed the most proportion to the interaction energy.
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Journal of Ocean University of China
·
2020
·Vol. 19
·期 6
·1353-1361
·
IF 0.802
Chen Yan,Liu Shanshan,Yang Guipeng,He Zhen
Methyl iodide (CH 3 I) is an important trace greenhouse gas in the atmosphere and an ozone-depleting substance. The influence of different environmental factors, such as the duration of illumination; the strength of illumination; the concentrations of humic acid, ferric ion (Fe 3+ ), and iodide ion (I − ); and pH, on the photochemical production of CH 3 I in artificial seawater (ASW) were tested by simulated solar irradiation. In addition, Yangtze River Estuary waters from inshore to offshore were used to explore the relationship between the photochemical production of CH 3 I and different sources of dissolved organic matter (DOM) in natural sea-water (NSW). The results revealed that higher concentrations of humic acid and I − , as well as higher strengths of illumination and longer illumination durations, promoted the photochemical formation of CH 3 I in ASW. The addition of Fe 3+ accelerated the photochemical production of CH 3 I, but high concentrations of Fe 3+ inhibited the formation of CH 3 I. Experiments on NSW obtained from the Yangtze River estuary spiked when concentrations of DOM were high, confirming that DOM plays an important role in facilitating the photochemical production of CH 3 I within the Yangtze River Estuary. The photochemical production of CH 3 I in the seawater was significantly higher under light conditions relative to dark conditions, indicating that illumination accelerated the production of CH 3 I.
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Science China-Technological Sciences
·
2020
·Vol. 63
·期 11
·2403-2412
·
IF 2.302
Li JinFeng,Zhao JiuLong,Chen YongKang,Zheng YuTing,Zhou LingLing,Zhao JiaYan,Liu YiYun,Liu XiuYing,Wang ShiGe
How to efficiently treat cancer in a minimally invasive manner has become one of the major focuses of recent developments in biomedicine. In this research, biodegradable sodium alginate (SA) hydrogel encapsulated with NaHCO 3 and glucose oxidase (GO X ) was synthesized using Fe 3+ as the crosslinker for the tumor chemodynamic therapy (CDT) and starvation therapy (ST). Material safety assessments revealed that this hydrogel possesses good in vitro and in vivo security. In tumor microenvrionment (TME), the Fe 3+ further reacted with the intracellular glutathione and was transformed into Fe 2+ , which triggered the Fenton reaction with the H 2 O 2 within TME and produced abundant highly toxic ·OH (hydroxyl radicals) for efficient tumor CDT. Furthermore, the GO X catalyzed the enzymolysis of glucose to consume the nutrient of the tumor and enhance the H 2 O 2 level in TME. Besides, the CO 2 bubbles that were generated from the decomposing of NaHCO 3 promoted the contact between glucose and GO X . Findings in this research would have important implications for the present status of tumor therapy.
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JOURNAL OF APPLIED ELECTROCHEMISTRY
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2020
·Vol. 50
·期 11
·1091-1099
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IF 2.384
Fa Dejuan,Miao Yuqing
Abstract The NiHPO 4 –Ni(OH) 2 nanowire-assembled bouquets were easily synthesized. Scanning electron microscopy and transmission electron microscopy show the NiHPO 4 –Ni(OH) 2 bouquets form through the organization of nanowires which arrange with certain direction. The electrocatalytic activities of NiHPO 4 –Ni(OH) 2 –GCE towards the oxidation of methanol and urea were studied in NaOH. The nanowire-assembled bouquets were modified on the surface of the glassy carbon electrode, leading to the increase on the surface area of the electrode, which in turn enhanced the current density and electrocatalytic performance for the oxidation of methanol and urea. It shows the potential applications for the utilization of these energy molecules. Graphic abstract
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Nano Research
·
2020
·Vol. 13
·期 11
·3012-3018
·
IF 8.183
Chao Daiyong,Chen Jinxing,Dong Qing,Wu Weiwei,Qi Desheng,Dong Shaojun
It is attractive and encouraging to develop new fluorescent carbon dots (CDs) with excellent optical properties and promising applications prospects. Herein, highly-efficient green emissive CDs ( m -CDs) with a high quantum yield (QY) of 71.7% in water are prepared through a facile solvothermal method. Interestingly, the m -CDs exhibit excellent fluorescence stability in the pH range of 1–9. However, the fluorescence intensity of the m -CDs is almost completely quenched as the pH is increased from 9 to 10. The mechanism of the unique pH-responsive behavior is discussed in detail and a plausible mechanism is proposed. Owing to the unique pH-responsive behavior, the m-CDs are used as a on-off fluorescent probe for water quality identification. By combining the reversible pH-ultrasensitive optical properties of the m-CDs in the pH range of 9–10 with the glucose oxidase-mimicking (GOx-mimicking) ability of Au nanoparticles (AuNPs), glucose can be quantitatively detected. Finally, two environment-friendly starch-based solid-state fluorescence materials (powder and film) are developed through green preparation routes.
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Petroleum Science
·
2021
·Vol. 18
·期 3
·883-894
·
IF 4.09
Song Xu-Guang,Zhao Ming-Wei,Dai Cai-Li,Wang Xin-Ke,Lv Wen-Jiao
The ultra-low permeability reservoir is regarded as an important energy source for oil and gas resource development and is attracting more and more attention. In this work, the active silica nanofluids were prepared by modified active silica nanoparticles and surfactant BSSB-12. The dispersion stability tests showed that the hydraulic radius of nanofluids was 58.59 nm and the zeta potential was − 48.39 mV. The active nanofluids can simultaneously regulate liquid–liquid interface and solid–liquid interface. The nanofluids can reduce the oil/water interfacial tension (IFT) from 23.5 to 6.7 mN/m, and the oil/water/solid contact angle was altered from 42° to 145°. The spontaneous imbibition tests showed that the oil recovery of 0.1 wt% active nanofluids was 20.5% and 8.5% higher than that of 3 wt% NaCl solution and 0.1 wt% BSSB-12 solution. Finally, the effects of nanofluids on dynamic contact angle, dynamic interfacial tension and moduli were studied from the adsorption behavior of nanofluids at solid–liquid and liquid–liquid interface. The oil detaching and transporting are completed by synergistic effect of wettability alteration and interfacial tension reduction. The findings of this study can help in better understanding of active nanofluids for EOR in ultra-low permeability reservoirs.
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Nano Research
·
2020
·Vol. 14
·期 4
·1012-1017
·
IF 8.183
Chen Hongye,Wang Liaoyu,Shen Chun,Zhang Jiahuan,Guo Wanlin
The electron-ion coupling in iontronics has great significance and potential for energy conversion and storage devices. However, it is a substantial challenge to integrate iontronics into all-solid-state semiconductor circuits and explore the electron-ion coupling in semiconductor devices. Here, by utilizing the organic-inorganic halide perovskite, we fabricate a planar heterojunction with a gradient distribution of halide anions. The diode-like halide migration was investigated by bias voltage induced asymmetric blue shift in photoluminescence spectrum. This pseudo-ionic diode behaviour was found to result from asymmetric charge injection characterized by I–V curves and gradient-halides-induced vacancy hopping indicated by energy dispersive spectroscopy (EDS). The planar gradient perovskite heterojunction provides a viable route for extending iontronic devices into the regime of all-solid-state semiconductors.
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Communications Biology
·
2020
·Vol. 3
·期 1
·1-15
·
IF 4.165
Ren Hongyan,Xiao Wei,Qin Xingliang,Cai Gangzhi,Chen Hao,Hua Zaidong,Cheng Cheng,Li Xinglei,Hua Wenjun,Xiao Hongwei,Zhang Liping,Dai Jiali,Zheng Xinmin,Zhu Zhe,Qian Chong,Yao Jie,Bi Yanzhen
Myostatin (MSTN), associated with the “double muscling” phenotype, affects muscle growth and fat deposition in animals, whereas how MSTN affects adipogenesis remains to be discovered. Here we show that MSTN can act through the MEF2C/miR222/SCD5 cascade to regulate fatty acid metabolism. We generated MSTN-knockout (KO) cloned Meishan pigs, which exhibits typical double muscling trait. We then sequenced transcriptome of subcutaneous fat tissues of wild-type (WT) and MSTN-KO pigs, and intersected the differentially expressed mRNAs and miRNAs to predict that stearoyl-CoA desaturase 5 (SCD5) is targeted by miR222. Transcription factor binding prediction showed that myogenic transcription factor 2C (MEF2C) potentially binds to the miR222 promoter. We hypothesized that MSTN-KO upregulates MEF2C and consequently increases the miR222 expression, which in turn targets SCD5 to suppress its translation. Biochemical, molecular and cellular experiments verified the existence of the cascade. This novel molecular pathway sheds light on new targets for genetic improvements in pigs.
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PubMed
高影响因子
BIODEGRADATION
·
2020
·Vol. 31
·期 4
·275-288
·
IF 2.805
Wang Yuanshan,Gong Meihua,Wang Xianlin,Peng Xiaolun,Wang Yuwei,Guan Jiahui,Cheng Dongyuan,Weng Chunyue,Zheng Yuguo
Ivermectin (IVM) is a widely used antiparasitic agent and acaricide. Despite its high efficiency against nematodes and arthropods, IVM may pose a threat to the environment due to its ecotoxcity. In this study, degradation of IVM by a newly isolated bacterium Aeromonas taiwanensis ZJB-18,044 was investigated. Strain ZJB-18,044 can completely degrade 50 mg/L IVM in 5 d with a biodegradation ability of 0.42 mg/L/h. Meanwhile, it exhibited high tolerance (50 mg/L) to doramectin, emamectin, rifampicin, and spiramycin. It can also efficiently degrade doramectin, emamectin, and spiramycin. The IVM degradation of strain ZJB-18,044 can be inhibited by erythromycin, azithromycin, spiramycin or rifampicin. However, supplement of carbonyl cyanide m -chlorophenylhydrazone, an uncoupler of oxidative phosphorylation, can partially recover the IVM degradation. Moreover, strain ZJB-18,044 cells can pump out excess IVM to maintain a low intracellular IVM concentration. Therefore, the IVM tolerance of strain ZJB-18,044 may be due to the regulation of the intracellular IVM concentration by the activated macrolide efflux pump(s). With the high IVM degradation efficiency, A. taiwanensis ZJB-18,044 may serve as a bioremediation agent for IVM and other macrolides in the environment.
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CHEMICAL PAPERS
·
2020
·Vol. 75
·期 3
·853-862
·
IF 1.68
Shao Tantan,Gong Yilu,Chen Xiaolong,Chen Lijun
The modified self-crosslinking fluorocarbon acrylate (MSFA) latex has been successfully synthesized via semi-continuous seeded emulsion polymerization. Methyl methylacrylate (MMA), butyl acrylate (BA), dodecafluoroheptyl methacrylate (DFMA), and hydroxypropyl methacrylate (HPMA) were chosen as main monomers, vinyl triethoxysilane (VTES), and benzyl methacrylate (BZMA) served as functional monomers. Latex was emulsified by mixed emulsifier containing nonionic surfactant alcohol ether glycoside (AEG1000) and anionic surfactant fatty alcohol polyoxyethylene ether sulfate (AES), and the reaction process was initiated by potassium persulfate (KPS). The optimal conditions were studied and obtained. The results indicated that the monomer conversion was up to 99.36%, and the coagulation was lowered to 0.60% under the optimal conditions. At the same time, the outward appearance of resultant latex presented blue white which confirmed the latex was a successful preparation. The latex was tested through Fourier-transform infrared spectroscopy (FTIR). The mechanical stability and chemical stability of latex were measured. Thermogravimeter (TGA) results demonstrated that the introduction of functional monomers has extensively augmented the thermal stability of prepared film. The glass transform temperature ( T g ) was detected by differential scanning calorimetry (DSC) and the water resistance of film was evaluated through water contact angle (WCA). The average particle size of latex was 62.99 nm and PDI was 0.069.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 1
·442-456
·
IF 3.553
Ma Xiaoqing,Tang Kang-lai,Yang Mingyu,Shi Wenbing,Zhao Wenxi
Reliable determination of hydrogen peroxide (H 2 O 2 ) and glucose is vital in various fields, especially implicated in diagnosis of diabetes and oxidative stress-related diseases. Herein, yolk–shell hollow Ni/NiO@C microspheres were template-synthesized with well-defined Ni-MOF (metal–organic framework) and further worked as a bifunctional electrocatalyst for glucose oxidation in alkaline solution and H 2 O 2 reduction in neutral solution, of which the unique structure and rich pore openings provide large accessible surface areas, while the uniformly distributed Ni, NiO and C efficiently catalyze and facilitate the reaction of glucose and H 2 O 2 , thus achieving a wide linear range of 0.01 to 10 mM with a sensitivity of 1291 μA mM −1 cm −2 and a detection limit of 0.116 μM for glucose and offering a sensitivity of 32.09 μA mM −1 cm −2 , a detection limit of 0.9 μM and a linear range up to 80.7 mM for H 2 O 2 , as well as good selectivity, excellent reproducibility and long-term stability for two analytes. What’s more, the as-constructed sensors realize quantitative detection glucose in blood serum with satisfying results and can use to monitor H 2 O 2 in neutral situation. This work opens an avenue to design high-performance sensoring materials but also becomes a great candidate in practical application.
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