POLYMER COMPOSITES
·
2023
·
IF 5.2
Tingting Luo,Kunkun Fu,Huixin Zhu,Yuan Chen,Bin Yang,Yan Li
Frontal polymerization (FP) is a self-sustaining reaction that relies on polymerization exothermicity and heat transfer. This study explores the in-plane and in-depth FP mechanisms of continuous fiber-reinforced epoxy composites. First, the effects of initiator and diluent concentrations on the FP behaviors of neat epoxy resins were examined. It was found that the frontal velocity and frontal temperature of the neat resins increase with an increase of either the initiator concentration or the diluent content, depending on the polymerization enthalpy and curing kinetics. Then, the FP behaviors of continuous carbon fiber and glass fiber-reinforced epoxy woven composites were investigated. The results showed that the in-plane FP behavior of the composites was primarily controlled by the thermal conductivity and specific heat capacity of the continuous fibers, whereas the in-depth FP behavior mainly depended on the pores of the woven fabrics. Highlights Frontal velocity and temperature of neat resins are controlled by the polymerization enthalpy and curing kinetics. The in-plane FP behavior of continuous fiber reinforced composites is dependent on the thermal conductivity and specific heat capacity of the fibers. The in-depth FP behavior of composite is determined by both the thermal conductivity of fibers and the pores of fabrics.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Siting Lai,Li Li,Qian Li,Shijiang Zhu,Guang Wang
Internal browning (IB) is a physiological disorder without external symptoms of postharvest pineapples, but whether and how IB influences pineapple volatiles remain unknown. We examined eigenvalues of volatiles in ‘Comte de Paris’ pineapples with or without IB using electronic nose (E-nose) and gas chromatography-mass spectrometry (GC–MS). Correlation coefficients between the responses of E-nose sensors S7 and S9 and IB were 0.836 and 0.804, respectively. The multilayer perceptron neural network and radial basis function neural network models classified IB degree with accuracy of 94.77% and 91.67%. GC–MS analysis revealed 30 volatile substances upregulated in pineapple with IB compared to those without, of which 15 were esters. IB regulated volatile compound synthesis through the lipoxygenase pathway which involved lipoxygenase , pyruvate decarboxylase 1, alcohol dehydrogenases , acyl-CoA oxidase 1 , and alcohol acyltransferase genes and their related enzymes. These results suggested that volatiles regulated by IB could be used to discriminate IB severity in pineapples.
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GREEN CHEMISTRY
·
2023
·Vol. 25
·期 18
·7372-7380
·
IF 9.8
Ruke Wang,Xuan Tang,Xinchun Jv,Yaxu Liu,Bo Wang
α-Chiral amines are key intermediates for scalable preparation of bioactive compounds; herein we present a novel palladium-based nanocatalyst capable of selectively catalyzing the reductive amination of carbonyl compounds, which enables the in situ regeneration of amino donors from wasteful co-products in a one-enzyme cascade using ω-transaminase, without the requirement of the expensive coenzyme NAD(P)H. The cascade network combines a ω-transaminase-assisted transamination with a selective reductive amination reaction facilitated by a heterogeneous palladium-based nanocatalyst. Nitrogen is sourced from hydroxylamine ions to convert generated co-products back into amino donors, yielding chiral amines with exceptional yields of up to 99% and excellent enantioselectivity. This chemoenzymatic one-enzyme transamination-reductive amination cascade network is highly atom-efficient and generates H2O as its sole by-product, demonstrating its potential impact in synthetic chemistry and beyond.
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PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2023
·Vol. 48
·期 8
·e202300047
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IF 1.8
Kai Han,Zhanxiong Xie,Lingyu Deng,Shijiao Li,Chenyang Li,Yi Liu,Chongwei An,Jingyu Wang
In order to solve the short stabilization time of the water-in-oil emulsion binder system and the shortcomings of the critical blast size of the explosive ink molding sample, a water-in-oil emulsion binder was designed with polyvinyl alcohol (PVA) aqueous solution as the aqueous phase, fluorocarbon resin (FEVE) ethyl acetate solution as the oil phase, and toluene diisocyanate (TDI) added to modify the water-in-oil emulsion binder. The hexanitrohexaazaisowurtzitane(CL-20)based explosive ink was made by incorporating submicron CL-20 into the binder system, and the print-formed samples were tested for microscopic morphology, crystallographic analysis, mechanical susceptibility, and detonation transmission performance. The results showed that the explosive ink‘s viscosity was moderate and suitable for direct printing, and the formed sample‘s surface particles were uniformly dispersed and had a honeycomb structure. The crystal form of CL-20 explosive in the explosive ink did not change, the molded sample‘s impact and frictional sensitivities were 1 J and 32 N lower than those of submicron CL-20, respectively, and the detonation velocity of the molded sample was 6655 m/s. The critical detonation size and critical detonation thickness were 1×0.0078 mm and 0.1 mm, respectively, and a critical detonation corner turning of 90°–160° could be achieved. The results show that the prepared binder system is stable for a long time, and the explosive ink molding samples have excellent blast transmission performance.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 12
·7503-7513
·
IF 3.9
Mengmeng Zhu,Yunpeng Liu,Haojie Ding,Shulan Zhang,Mujing Qu,Tongtong Xuan,Huili Li
All-inorganic CsPbX 3 (X = Cl, Br, and I) perovskite nanocrystals (NCs) have great application prospects in many fields due to their excellent photoelectric properties. However, CsPbX 3 NCs are extremely sensitive to water, heat, light, and oxygen, which leads to dramatic photoluminescence quenching and seriously restricts their future commercial applications. Herein, a novel, simple one-step solution strategy for synthesizing high-quality CsPbBr 3 NCs was reported. By the combination of the hot-injection process with the mesoporous template confinement effect of the KIT-6 matrix, the space-confined growth of NCs was precisely achieved. The CsPbBr 3 NCs encapsulated by KIT-6 (CsPbBr 3 @KIT-6 composite) exhibited a uniform size, a high photoluminescence quantum yield (PLQY) of up to 82%, and a narrow full width at half-maximum (FWHM) of 24 nm. Most importantly, CsPbBr 3 @KIT-6 powder composites had dramatically enhanced light, thermal and water stability in comparison with colloidal CsPbBr 3 NCs due to the dual protection of organic ligands and matrix templates. Ultimately, a white light-emitting diode (LED) device was successfully fabricated by encapsulating a mixture of green-emitting CsPbBr 3 @KIT-6 composite and red-emitting K 2 SiF 6 :Mn 4+ phosphor onto a blue-emitting InGaN LED chip. A color coordinate of (0.327, 0.337) and a wide color gamut of 128% NTSC well demonstrate their potential applications in lighting and display.
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Nanomaterials
·
2022
·Vol. 12
·期 18
·3089
·
IF 5.719
Li Tan,Yiming Chen,Didi Li,Shaobin Wang,Zhimin Ao
An in situ photo-Fenton system can continuously generate H2O2by photocatalysis, activating H2O2in situ to form strong oxidizing ·OH radicals and degrading organic pollutants. A WSe2/g-C3N4composite catalyst with WSe2as a co-catalyst was successfully synthesized in this work and used for in situ photo-Fenton oxidation. The WSe2/g-C3N4composite with 7% loading of WSe2(CNW2) has H2O2production of 35.04 μmol/L, which is fourteen times higher than pure g-C3N4. The degradation efficiency of CNW2 for phenol reached 67%. By constructing an in situ Fenton-system, the phenol degradation rate could be further enhanced to 90%. WSe2can enhance the catalytic activity of CNW2 by increasing electron mobility and inhibiting the recombination of photogenerated electron–hole pairs. Moreover, the addition of Fe2+activates the generated H2O2, thus increasing the amount of strong oxidative ·OH radicals for the degradation of phenol. Overall, CNW2 is a promising novel material with a high H2O2yield and can directly degrade organic pollutants using an in situ photo-Fenton reaction.Keywords:WSe2/g-C3N4;visible light;in situ photo-Fenton;phenol degradation
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JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Shenglong Tian,Zede Yi,Junqing Chen,Shiyu Fu
The capture of radioactive iodine is an inevitable requirement in nuclear industry for environmental protection. Metal-organic frameworks (MOFs) are a new generation of sorbents that have wide applications for iodine adsorption and recovery. Although the loading of MOFs on wood can avoid the drawbacks of the powder form of MOFs in implementation, the dense structure of wood results in the lower loading, even after delignification, which limits the adsorption capacity. Herein, a hierarchically porous UiO-66-NH 2 @WCA composite was fabricated by in-situ synthesis of UiO-66-NH 2 in wood-derived cellulose aerogel (WCA) that was further removed hemicellulose from delignified wood. UiO-66-NH 2 @WCA exhibited a high loading (36 wt%) of UiO-66-NH 2 crystals and a high adsorption capacity of 704 mg/g for iodine vapor and 248 mg/g for iodine aqueous solution. The adsorption behavior in iodine aqueous solution was well predicted by the Freundlich isotherm and pseudo-second-order kinetic model. The adsorption capacity of UiO-66-NH 2 @WCA was highest in solution when the pH was 6, while the ionic strength had little effect. The hydroxyl groups on the WCA matrix had a charge transfer effect with iodine, providing additional sites for iodine capture . Furthermore, a packed column system was applied to demonstrate the excellent recyclability and potential for practical application.
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CHEMICO-BIOLOGICAL INTERACTIONS
·
2022
·
IF 5.168
Yi Yang,Xiangjie Wang,Haolin Zhang,Jiali Li,Jingyi Chen,Miao Yu,Guangxing Li,Ruili Zhang,Ming Ge
Organophosphorus flame retardants (OPFRs) are increasingly being used in many industries since brominated flame retardants (BFRs) have been phase-out. However, OPFRs are associated with environmental pollution and animal health risks, especially in the farming industry. Nevertheless, no study has evaluated the toxicity of OPFRs, as a new flame retardant, on avian species. In order to investigate the specific toxic effects of 2-ethylhexyl diphenyl phosphate (EHDPHP) exposure on chickens and the molecular biological mechanisms that cause damage to the organism, the chicken liver has been studied as a potential target organ for toxic effects. In this study, 7-day-old male chickens were treated with different concentrations of EHDPHP to further investigate the toxicity and mechanisms of OPRs on birds. The samples were taken at 14 d, 28 d, and 42 d for analysis. EHDPHP exposure affected the growth and development of chickens. Furthermore, the microstructural and ultrastructural observations clearly reflected the damage caused by EHDPHP exposure to the livers. The levels of the liver tissue asparate aminotransferase (AST) and alanine aminotransferase (ALT) decreased with increasing gavage dose. In contrast, the levels of oxidative stress in chicken liver and the mRNA expression of related factors increased with increasing gavage dose. In addition, EHDPHP exposure increased liver tissue iron content and affected mRNA expression and protein levels of ferroptosis-related factors in livers. Besides, ferroptosis causes inflammation, thus promoting the synthesis and release of inflammatory factors. This research indicates that EHDPHP can damage chicken livers through oxidative stress and ferroptosis.
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BIOCHEMICAL PHARMACOLOGY
·
2022
·
IF 6.1
Min Chen,Yifei Xiao,Fugui Zhang,Jianhao Du,Li Zhang,Yifang Li,Danyi Lu,Zhigang Wang,Baojian Wu
Delirium is a common and serious neuropsychiatric syndrome characterized with acute cognitive and attentional deficits, however, the effective therapies are lacking. Here, using mouse models of delirium, we investigated the effects of tangeretin (TAN, a natural flavonoid) on cognitive impairment by assessing object preference with novel object recognition (NOR) test and spontaneous alternation with Y maze test. We found that TAN, as a RORα/γ agonist, prevented cognitive decline in delirious mice as evidenced by a normal novel object preference and increased spontaneous alternation. This was accompanied by decreased expression of ERK1/2, TNFα and IL-1β as well as diminished microglial activation in delirious mice. The protective effect of TAN on delirium was mainly attributed to increased hippocampal E4BP4 expression (a known target of RORs and a regulator of cognition in delirium through modulating the ERK1/2 cascade and microglial activation) via activation of RORα/γ. In addition, TAN treatment modulated the expression of RORα/γ target genes (such as E4bp4 and Bmal1 ) and inhibited the expression of TNFα and IL-1β in lipopolysaccharide (LPS)-stimulated cells, supporting a beneficial effect of TAN on delirium. In conclusion, TAN is identified as a RORα/γ agonist which promotes E4BP4 expression to prevent cognitive decline in delirious mice. Our findings may have implications for drug development of TAN for prevention and treatment of various diseases associated with cognitive deficiency.
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ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 3
·2209368
·
IF 19.924
Manchun Zheng,Yang Shen,Qiushun Zou,Yaohua Huang,Ke Huang,Xiaoyi She,Chongjun Jin
Fast and full switching of plasmonic resonances would provide a building block for integrated electro-optically active plasmonics. To date, limited by the material properties, achieving a plasmonic resonance that can be turned fully ON and OFF in the visible region remains a formidable challenge. In this study, a nearly full optical switching based on a moisture-driven metal-hydrogel-metal (MHM) metasurface at visible frequency is experimentally realized. As a result of the bound state in the continuum (BIC)-to-quasi-BIC transition in the MHM, a sharp Fano-type quasi-BIC resonance can be switched off and back on with an ultrahigh reflectance modulation depth up to −14.6 dB within 1 s by moisture loading. Such a BIC-to-quasi-BIC transition can be well mediated by engineering the coupling between the magnetic mode and surface plasmon polariton via an active control of the gap distance between the two metallic layers. Using this concept, the MHM is demonstrated as a fast-response breathing sensor with a maximum detectable respiratory rate of up to 30 breaths per minute (bpm). These results suggest that our approach will help to realize plasmonic-based integrated active optical devices in optical sensing and modulation.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2022
·
IF 5.895
Zhuang Zhang,Zanrong Wen,Kaixin Li,Wei Xu,Ni Liang,Xinyue Yu,Changyou Li,Dong Chu,Lei Guo
Bemisia tabaci is an important agricultural sucking pest, and it develops serious resistance to various insecticides. Although cytochrome P450 was involved in the resistance to cyantraniliprole, limited studies have been conducted on B. tabaci. In the present study, piperonyl butoxide significantly increased the toxicity of cyantraniliprole. P450 activities in two resistant populations were 1.97- and 2.17-fold higher than that in the susceptible population. Among 79 P450 genes, CYP6CX3 expressions in two resistant populations were 3.08- and 3.67-fold higher than that in the susceptible population. When CYP6CX3 was knocked down, the toxicity of cyantraniliprole increased significantly. The LC50 value of cyantraniliprole to the Drosophila melanogaster line overexpressing B. tabaciCYP6CX3 increased 7.34-fold. The content of cyantraniliprole was decreased by 25.74 ± 4.27% after mixing with CYP6CX3 and CPR for 2 h. These results suggested that the overexpression of CYP6CX3 was likely involved in the resistance to cyantraniliprole in B. tabaci.
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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2022
·Vol. 103
·期 2
·770-778
·
IF 4.125
Yuteng Fu,David Julian McClements,Shunjing Luo,Jiangping Ye,Chengmei Liu
BACKGROUND Rutin is a natural bioactive flavonoid that is poor in water solubility and chemical stability. Encapsulation can be used to protect bioactive molecules from chemical or physical decomposition during food processing and storage. Thus, the effect of initial particle size on the ability of oil-in-water emulsions to retain rutin during storage was investigated. RESULTS Rutin was encapsulated in oil-in-water emulsions with different mean surface-weighted diameters: d 3,2 = 0.56 μm (small), 0.73 μm (medium), and 2.32 μm (large). As expected, the resistance of the emulsions to coalescence and creaming during storage increased as the particle size decreased due to weakening of the colloidal and gravitational forces acting on the droplets. The concentration of rutin in the emulsions decreased during storage (28 days), which was mainly attributed to photodegradation of the flavonoid. The loss of rutin from the emulsions during storage was fitted using a second-order equation. The rutin degradation rate constant k decreased and the half-life t 1/2 increased with decreasing droplet size, which was attributed to the stronger encapsulation and light scattering by smaller oil droplets reducing the amount of light that can penetrate into the emulsions. CONCLUSION This study has important implications for the design of more efficacious emulsion-based delivery systems for incorporating health-promoting nutraceuticals into foods. © 2022 Society of Chemical Industry.
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