POLYMER ENGINEERING AND SCIENCE
·
2016
·Vol. 56
·期 10
·1118-1124
·
IF 1.719
Weijian Xiong,Xue Gao,Dayong Gui,Xueqing Cai,Guiming Tan,Jianhong Liu
A liquid crystalline molecule, 4'-allyloxy-biphenyl-4-ol (AOBPO), was used to functionalize carbon nanotubers (CNTs) via physical means and chemical means, respectively. The physically functionalized CNTs (AOBPO-CNTs) and chemically functionalized CNTs (AOBPO-O-CNTs) were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), fluorescent spectroscopy, and Raman spectroscopy. The two functionalized CNTs were mixed with silicone resin as fillers to fabricate organosilicone nanocomposites. Scanning electron microscopy (SEM) images indicated that the dispersion of CNTs in silicone resin and compatibility of CNTs with silicone resin were improved effectively after functionalization with liquid crystal via physical or chemical means. The thermal and mechanical properties testing indicated that, the chemically functionalized CNTs got a better effect in improvement of mechanical properties of silicon resin than the physically functionalized CNTs, whereas the physically functionalized CNTs was more applicable to enhance the thermal conductivity of silicon resin. The tensile strength of AOBPO-O-CNTs/silicon resin increased by 37.8% over that of neat CNTs/silicon resin when the mass fraction of AOBPO-O-CNTs was 1.0%, and the elastic modulus of AOBPO-O-CNTs/silicon resin increased by 32.8% over that of CNTs/silicon resin if it came up to 2.0%. The thermal conductivity of the resin filled with AOBPO-CNTs was improved to be 1.176 W (m −1 K −1 ) at the mass fraction of 5.0%, which was enhanced more than 73.2% over that of CNTs/silicon resin. POLYM. ENG. SCI., 56:1118–1124, 2016. © 2016 Society of Plastics Engineers
研究领域:
材料科学
·
聚合物复合材料
·
纳米技术
·
热学性能
·
机械工程
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2026
·Vol. 60
·期 30
·20825-20842
·
IF 12.2
Miao Chenjiao,Zhang Binwen,Yu Wangyong,Li Yanfei,Cao Zheng
1-Ethoxy-2,3-difluoro-4-(trans-4-propylcyclohexyl) benzene
(EDPrB),
a highly polluting fluorinated liquid-crystal monomers (FLCMs), accumulates
in the kidneys over the long term. First, our study demonstrates that
exposure to EDPrB can induce inflammatory responses and fibrosis in
human renal cortical proximal tubule epithelial cells (HK-2), posing
a risk of nephrotoxicity. Next, our study investigates the renal injury
induced by EDPrB in male Kunming mice after 70-day exposure at 13,
130, and 1300 μg/kg bw/day, using an adverse outcome pathway
(AOP) framework. Histopathological observations demonstrate that EDPrB
corresponds to an elevated probability of developing chronic kidney
disease (CKD). Proteomics and Western blot analysis revealed that
mTOR signaling may be the mechanism by which EDPrB induces CKD in
mice and causes damage to HK-2 cells. Finally, by treating EDPrB-exposed
mice with RAPA, we demonstrated that activation of the mTOR signaling
is the molecular initiating event driving EDPrB-induced CKD in mice.
This study proposes an AOP framework focused on EDPrB-induced CKD.
The molecular initiating event is identified as mTOR activation, followed
by autophagy inhibition leading to inflammation and fibrosis as key
events, ultimately resulting in CKD as an adverse outcome. This highlights
the renal risks of FLCMs and supports stricter environmental release
regulations.
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高影响因子
CATALYSIS COMMUNICATIONS
·
2014
·
IF 3.32
Xuanduong Le,Zhengping Dong,Xinlin Li,Wei Zhang,Minhdong Le,Jiantai Ma
In this study, a fibrous nano-silica supported palladium nanocatalyst (Pd/KCC-1), which features with easy accessibility of active sites and high catalytic activity, was synthesized by a simple, cost-effective procedure. The Pd/KCC-1 nanocatalyst exhibited excellent catalytic activity in the reduction of 4-nitrophenol and hydrodechlorination of 4-chlorophenol in aqueous solution under mild condition. The unique dendritic fibrous morphology of the support led to the poor aggregation of the Pd nanoparticles and dramatically increased its accessibility. The easy accessibility and excellent catalytic activity demonstrated by the Pd/KCC-1 nanocatalyst make it a promising candidate for various Pd-based catalytic applications.
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INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Xiao-Bao Li,Chun-Li Hu,Fang Kong,Jiang-Gao Mao
Two new antimonous phosphates, namely Ba3Sb2(PO4)4 and Cd3Sb2(PO4)4(H2O)2, have been successfully prepared through mild hydrothermal reactions. Ba3Sb2(PO4)4 features a 1D [Sb(PO4)2]3– chain structure separated by Ba2+ cations while Cd3Sb2(PO4)4(H2O)2 presents a 2D [Sb(PO4)2]3– layered structure with Cd2+ located at the interlayer space. The [Sb(PO4)2]3– chain in Ba3Sb2(PO4)4 is the first example of 1D antimonous phosphate structure, and Cd3Sb2(PO4)4(H2O)2 represents the first d10 transition metal antimonous phosphate. Based on UV–vis–NIR spectra, both Ba3Sb2(PO4)4 and Cd3Sb2(PO4)4(H2O)2 can display large optical band gaps (4.30 and 4.36 eV, respectively). But their transparent ranges are quite different because of the coordination water of Cd3Sb2(PO4)4(H2O)2 (500–2000 and 500–1300 nm for Ba and Cd compounds). The anhydrous Ba3Sb2(PO4)4 shows high thermal stability in the nitrogen atmosphere (900 °C). Because of the incorporation of the lone pair cation of Sb(III), the birefringence of Ba3Sb2(PO4)4 and Cd3Sb2(PO4)4(H2O)2 has been enhanced to 0.086 and 0.053 at 532 nm, respectively.
研究领域:
无机化学
·
材料科学
·
光学材料
·
晶体学
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DESALINATION
·
2022
·
IF 11.211
Jia-Li Zhao,Meng-Long Zhang,Zhi-Kai Zhang,Cheng Ma,Zhong-Yan Cao,Shao-Fei Ni,Ying Xu
Two new yet structurally similar scale inhibitors (PASP-AAB and PASP-AAA), have been successfully synthesized through ring-opening reaction of polysuccinimide (PSI) with inexpensive (4-[(2-aminoethyl) amino]-4-oxobutanoic acid or glycylglycine. Static antiscaling experiments imply they could dramatically improve the antiscaling efficiency of gypsum, better than that of PASP. Moreover, the slightly different nitrogen atom position on the side chain of PASP-AAB and PASP-AAA enables the former efficiently inhibit the gypsum scale at low concentration (2.0 mg/L). In addition, our results indicate the antiscaling performance of PASP-AAB (at 4.0 mg/L) could maintain the excellent efficiency (>99 %) against gypsum for at least 7 days, better than that of some reported polymer-, and phosphorus-based industrial antiscalants. The very efficient gypsum scale inhibition property of PASP-AAB makes it as one of the very effective green antiscalants reported in the literature by now. Detailed mechanism studies reveal that the better calcium scale inhibition performance of PASP-AAB should be attributed to the easier formation of seven-membered chelation ring of side chain with Ca 2+ . The unprecedented nitrogen substitution effect disclosed in this work provides a new perspective for understanding the structure-activity relationship of the grafting-modified polymeric inhibitor, meaningful for developing other novel green scale inhibitors.
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JOURNAL OF MOLECULAR STRUCTURE
·
2021
·
IF 3.196
Chenli Wei,Zeyu Guo,Yongjie Li,Jie Huang
A new nitrogen-rich energetic complex Cd(DMF) 2 BTZAF (1) (DMF= N,N-Dimethylformamide, H 2 BTZAF= 3, 3′-bis(1H-tetrazol-5-yl)-4, 4′-azofurazan) was first synthesized by the reaction of Cd(NO 3 ) 2 ·4H 2 O with 4-amino-3-(5-tetrazolate)-furazan. The compound 1 was characterized by elemental analysis and FT-IR spectrum analysis, respectively. The crystal structure of complex 1 was determined by single-crystal X-ray diffraction. It revealed that 1 crystallizes in the monoclinic space group P2 1 /c. A Cd 2+ ion is coordinated by four N atoms and two O atoms to form a distorted octahedral structure. Among them, four nitrogen atoms are from the four BTZAF 2− ions and the other two oxygen atoms are from two DMF molecules. Moreover, the thermal decomposition behavior of compound 1 was studied with DSC and TG-DTG methods. The non-isothermal kinetic parameters of compound 1 was calculated by Kissinger's method and Ozawa-Doyle's method. In addition, the thermal safety performance and the impact sensitivity of complex 1 were measured and calculated, and the results showed that the synthetic compound has good insensitivity and stability.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2020
·Vol. 22
·期 15
·8006-8020
·
IF 3.43
Chris Tsz-Leung Chan,Chensheng Ma,Ruth Chau-Ting Chan,Hui-Min Ou,Han-Xin Xie,Allen Ka-Wa Wong,Ming-Liang Wang,Wai-Ming Kwok
4-Aminobenzoic acid (PABA) is one of the earliest patented and most commonly used sunscreen components. There is however a long-lasting controversy on its photo-protective efficacy owing to the lack of information on its protolytic equilibrium and photo-dynamics after absorption of ultraviolet radiation in physiologically relevant aqueous solution. The excitation dynamics in water also remains largely unknown for analogs of PABA such as 4-dimethylaminoacetophenone (DMAAP) and 4-dimethylaminobenzaldehyde (DMABA) which are recognized as prototypes for photo-induced twisted intramolecular charge transfer (TICT). Herein we report a combined application of femtosecond broadband time-resolved fluorescence and transient absorption coupled with density functional theoretical study for PABA, DMAAP, and DMABA under several solvent conditions with representative properties in terms of the pH, polarity and hydrogen bonding capacity. The results we gained demonstrate that, in a neutral aqueous solution, PABA taking the deprotonated anion form in the ground state undergoes rapid protonation after excitation, producing excited state species in the neutral form that may shift effectively by intersystem crossing (ISC) to the long-lasting triplet state capable of damaging nucleic acids. This provides evidence at the molecular level for the detrimental effect of PABA if used as a sunscreen ingredient. In contrast, our investigation on DMAAP and DMABA unveils an unusual solvent controlled deactivation dynamics rendered by the participation of the carbonyl oxygen associated nOπ* state featuring energy and structure strongly responsive to solvent properties. In particular, these molecules in water exhibit solute–solvent hydrogen bonding at the sites of the carbonyl oxygen and the amino nitrogen which is, respectively, weakened and strengthened after the excitation, leading to state reversal and formation of a nOπ* state with a peculiar non-planar structure. This quenches strongly the excitation, eliminates the TICT, suppresses the ISC and opens up the otherwise inaccessible internal conversion (IC) to account for ∼80% of the entire deactivation. The IC, observed to proceed at a rate of ∼2.5 ps, allows the effective recovery of the ground state, providing substantial protection against ultraviolet irradiation. Moreover, the revelation of highly solvent sensitive fluorescence emission from DMABA and DMAAP implies the potential application of these molecules as the functional element in the design of sensory materials for probing the polarity and hydrogen bonding character of the surrounding environment.
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高影响因子
APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Jingjie Luo,Enhui Qu,Yixue Zhou,Yanan Dong,Changhai Liang
Rhenium , although viewed as one of the noble metals with lower-price, has been commonly used as doping element in the bimetallic catalysts due to its middlebrow to activate hydrogen. Its major role as catalyst is less frequently mentioned. In this work, rhenium has been decorated on the surface of activated carbon and used for the selective hydrogenation of dimethyl 1, 4-cyclohexanedicarboxylate (DMCD) to 1, 4-cyclohexanedimethanol (CHDM). Characterizations suggested that ReO x particles were anchored occupying the surface oxygenated groups on pre-functionalized carbon. Rhenium decoration modified both the textural and chemical properties of the samples. Electrons were easily transferred from Re to the neighboring C atoms as a result of the formation of fine ReO x particles. Medium strong acid sites were generated and rhenium species in the reduced states could be still maintained under appropriate rhenium dispersion. The moderate hydrogenation ability of rhenium catalyst partially restrained the excessive hydrogenation of CHDM to other by-products. Rational decoration of 5 wt% Re performed the better catalytic performance with complete conversion of diester and 66 % yield of diol. The specific rate reached 9.5 × 10 2 m m o l D M C D ∙ g R e - 1 ∙ h - 1 at 220 °C under 10 MPa H 2 .
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INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
·
2019
·Vol. 55
·期 4
·1833-1842
·
IF 2.281
Lukai Ma,Guoqin Liu,Weiwei Cheng,Xinqi Liu,Huifan Liu,Qin Wang,Guoxing Mao,Xintong Cai,Charles Brennan,Margaret A. Brennan
Summary The present work investigated the formation of three toxic aldehydes, malondialdehyde (MDA), 4-hydroxy-hexenal (HHE) and 4-hydroxy-nonenal (HNE), during deep-frying of different foods in corn oil (CO), rapeseed oil (RO) and linseed oil (LO). Besides, their contents in French fries (FF) and fried chicken breast meat (FCBM) were also explored. Results showed that the MDA/HHE/HNE levels in frying groups were all lower than those in control, indicating the incorporation into the fried foods. Apart from the different levels, MDA/HHE/HNE in FF and FCBM possessed similar variation tendencies, revealing the matrix-mediated distribution. The combined exposure assessment based on the threshold of toxicological concern (TTC) levels was conducted, and risks of exceeding the limitation values (1.5 μg kg bw −1 day −1 ) for HNE in CO and HHE in LO were exhibited. The consumption of both FF and FCBM should be regulated, considering the levels of MDA, HHE and HNE these fried foods may contain.
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MOLECULAR IMMUNOLOGY
·
2018
·
IF 3.188
Gang Chi,Xin-Xia Feng,Ying-Xia Ru,Ting Xiong,Yuan Gao,Han Wang,Zhen-Long Luo,Ran Mo,Fang Guo,Yong-Pei He,Gui-Mei Zhang,De-An Tian,Zuo-Hua Feng
Autoimmune hepatitis (AIH), a serious autoimmune liver disease, can be a lifelong illness, leading to fibrosis, cirrhosis, and hepatocellular carcinoma (HCC). So far the mechanisms for disease initiation are largely unknown. Here we report that the amplified non-AIH liver inflammation could promote the initiation of AIH due to the sustained increase of IL-6, IL-12, IL-4, and IL-25 in the liver. The liver injury resulting from virus (adenovirus) or chemicals (CCl 4 ) could induce an amplified (stronger/long-lasting) hepatic inflammation by releasing the ligands for TLR2/TLR4. The amplified inflammation resulted in the increase of multiple cytokines and chemokines in the liver. Among them, the sustained increase of IL-6/IL-12 resulted in the activation of STAT3 and STAT4 in hepatic CD4 + CD25 + Treg cells, thus suppressing Foxp3 gene expression to reduce the suppressive function of Treg cells in the liver, but not those in the spleen. The increase of IL-12 and the impairment of Treg function promoted Th1 response in presence of self-mimicking antigen (human CYP2D6). Intriguingly, the amplified inflammation resulted in the increase of IL-4 and IL-25 in the liver. The moderate increase of IL-4 was sufficient for cooperating with IL-25 to initiate Th2 response, but inefficient in suppressing Th1 response, favoring the initiation of autoimmune response. Consequently, either adenovirus/CYP2D6 or CCl 4 /CYP2D6 could induce the autoimmune response and AIH in the mice, leading to hepatic fibrosis. The findings in this study suggest that the amplified non-AIH inflammation in the liver could be a driving force for the initiation of autoimmune response and AIH.
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高影响因子
CRYSTENGCOMM
·
2023
·Vol. 25
·期 43
·6091-6095
·
IF 3.1
Jing Huang,Minghao Li,Zhanhui Liu,Jingyan Hua,Hui Zeng,Yunyun Chen,Jing Su
In this work, copper-based halides Cs2CuCl4, Cs2CuBr4 and mixed-halides Cs2CuCl2.8Br1.2, Cs2CuCl2Br2 and Cs2CuCl1.2Br2.8 single crystals were grown via the evaporation method using deionized water as a solvent. The structure and actual element component of the Cs2Cu(Cl, Br)4 crystals were studied using XRD and EDS. The halides of Cs2Cu(Cl, Br)4 exhibit both good light absorption and PL performance. The absorption peaks related to LMCT electron transition bands were observed, and the tunable band gap was obtained by adjusting the Br−/Cl− ratio. PL spectra show purple, blue, and green luminescence, and the luminescence mechanism was analyzed. Our study indicates that the Cs2Cu(Cl, Br)4 halides have application prospects in optoelectronic devices.
研究领域:
材料科学
·
光学
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高影响因子
Catalysts
·
2022
·Vol. 12
·期 9
·997
·
IF 4.501
Xingmiao Zhu,Pengcheng Chen,Pu Zheng
4-Hydroxy benzylideneacetone (4-HBA) is an organic synthesis intermediate and can be used as a precursor for the synthesis of raspberry ketone. Herein, 2-deoxy-D-ribose 5-phosphate aldolase (DERA) was overexpressed inE. coliBL21 (DE3) as an attractive catalyst for enzymatic aldol reactions. The aldol reaction between 4-hydroxybenzaldehyde (4-HBD) and acetone to biosynthesize 4-HBA was catalyzed by whole-cellE. coliBL21 (DE3) (pRSF-Deoc). The yield and 4-HBA concentration were 92.8% and 111.35 mM, respectively, when using 120 mM 4-HBD and acetone as substrates. When the concentration of 4-HBD was increased to 480 mM, 376.4 mM 4-HBA was obtained by a fed-batch strategy with a yield of 78.4%, which was about a 28% improvement compared to the one-time addition strategy.E. coliBL21 (DE3) (pRSF-Deoc) cells were further immobilized withK-carrageenan, and the immobilized cells still maintained a residual activity of above 90% after 10 repeated uses. Our study provides a promising method of biosynthesizing 4-HBA.Keywords:4-hydroxybenzylideneacetone;2-deoxy-D-ribose 5-phosphate aldolases;whole-cell catalysis;fed-batch strategy;immobilized cells
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危险品化学品经营许可证（带存储）