POLYMER COMPOSITES
·
2018
·Vol. 40
·期 6
·2346-2356
·
IF 1.943
Zhujun Wang,Qian Li,Zheming Chen,Huayi Li,Shuirong Zheng,Xiaobin Tang
Functionalization of boron nitride nanosheets (BNNSs) has always been a challenge due to its chemical inertness and anti-oxidative properties. In a concentrated base environment, the B-N bonds on the surface of BNNSs were broken to produce a large number of B-OH and N-H functional groups. Afterwards, aniline carbocation produced by decomposition of the diazonium salt was utilized to achieve high grafting content of Ph-NH 2 groups onto the surface of BNNSs. Further, the amide reaction between amino and stearyl chloride verified the reactivity of Ph-NH 2 groups on the surface of BNNSs, with the result that BNNSs were abundantly decorated by aliphatic chains at 22.9 wt% grafting yield. The surface aliphatic chains of BNNSs strongly improved the interfacial adhesion between the High-density polyethylene (HDPE) matrix and the filler and provided an excellent dispersion of SC-BNNSs in the HDPE matrix. Therefore, HDPE/SC-BNNSs nanocomposites showed improved thermal stability, thermal conductivity, neutron shielding property and flexural modulus with no apparent reduction in tensile strength. When filler content exceeded 5 wt%, the HDPE/SC-BNNSs nanocomposites showed a higher thermal decomposition temperature than the composites with pristine BNNSs fillers. POLYM. COMPOS., 40:2346–2356, 2019. © 2018 Society of Plastics Engineers
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 60
·34297-34303
·
IF 2.936
De Bai,Qin Chen,Yang Chai,Tianhua Ren,Caijuan Huang,Ian D. V. Ingram,Michael North,Qiang Zheng,Haibo Xie
Vanillin has been regarded as one of the important biomass-based platform chemicals for aromatic polymers synthesis. Herein, novel symmetric bis(4-formyl-2-methoxyphenyl)carbonate (BFMC) and bis(4-(hydroxymethyl)-2-methoxyphenyl)carbonate (BHMC) polymeric monomers have been synthesized in high yields using vanillin as a raw chemical, which have been submitted for polymer synthesis via well-established polymeric strategies. A new class of poly(carbonate ester)s oligomers with amide moieties in their side chain can be prepared by using the BFMC as one of monomers via the Passerini three compound reaction (3CR). A new class of poly(carbonate ester)s oligomers and poly(carbonate urethane)s can be prepared via reactions between BHMC with dicarboxylic acid chlorides and diisocyanates, respectively. Their structure have been confirmed by 1H NMR, 13C NMR and FTIR, and the gel permeation chromatograph (GPC) analysis shows that the Mn of poly(carbonate ester)s oligomers ranges from 3100 to 7900 with PDI between 1.31 and 1.65, and the Mn of poly(carbonate urethane)s ranges from 16 400 to 24 400 with PDI ranging from 1.36 to 2.17. The DSC analysis shows that the poly(carbonate ester)s oligomers have relative low Tg ranging from 37.4 to 74.1 °C, and the poly(carbonate urethane)s have Tg ranging from 97.3 to 138.3 °C, mainly correlating to the structure of dicarboxylic acid chlorides and diisocyanates used.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2018
·
IF 3.024
Yang Chen,Bin Jiang,Haozhen Dou,Luhong Zhang,Xiaowei Tantai,Yongli Sun,Haiming Zhang
Deep eutectic solvents (DESs) have been seen as promising absorbents for SO2 capture in recent years. In this work, a series of DESs based on imidazole derivatives were synthesized to investigate the low pressure SO2 absorption. The physical properties were determined, and the DESs exhibited low viscosities and high stability. Effects of composition, operating temperature and pressure, and water content on SO2 absorption capacity were investigated. It was demonstrated that the 1-butyl-3-methylimidazolium chloride (BmimCl):4-methylimidazole (4CH3-Im) (1:2) could absorb 1.42 and 0.189 gSO2/gDES at 101.3 and 1 kPa SO2 partial pressure, respectively, which were higher than most reports to date under this condition. The absorbed SO2 could be released easily under mild condition, and there was no change in absorption performance after 5 cycles. Furthermore, the absorption mechanism studied by FTIR and NMR indicated that the high SO2 absorption capacity originated from the synergistic interaction of BmimCl and 4CH3-Im on SO2. This work opens opportunity for low partial pressure SO2 capture and insight into the formation mechanism of DESs for further investigation.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Yang Wang,Qiongen Hu,Ting Li,Piming Ma,Shengwen Zhang,Mingliang Du,Mingqing Chen,Hongji Zhang,Weifu Dong
While polylactide (PLA) is considered to be a promising renewable materials, broader application is hindered by its brittle nature and high cost. PLA-based nanocomposites with enhanced toughness were fabricated by blending of commercial PLA and core–shell starch-based nanoparticles (CSS NPs), in which the CSS NPs were synthesized via gelatinization of the esterified starch to form a hard core, followed by soap-free emulsion copolymerization of ethyl acrylate to form poly(ethyl acrylate) (PEA) as the outer shell. A synergistic association of hard starch and the soft PEA induced unique toughening effects on the PLA. In particular, with addition of 20 wt % CSS NPs, the elongation at break and notched impact strength of PLA/CSS nanocomposite reached to 412% and 31.4 kJ·m–2, which are simultaneously 61 and 9 times higher than that of pure PLA, respectively. More important, the resulting nanocomposites still retained relatively high tensile strength similar to pure PLA. These results establish a strategy for PLA composites applications.
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2018
·Vol. 23
·期 9
·2290
·
IF 3.098
Liyan Liu,Yaohui Lei,Jianhui Zhang,Na Li,Fan Zhang,Huaqiao Wang,Feng He
Fluorophores with aggregation-induced emission enhancement (AIEE) properties have attracted more attention in recent years. In order to realise more valuable applications, the different kinds of AIEE molecules are in serious need of further development. Therefore, a novel flavone-based AIEE system derived from restriction of intramolecular rotation (RIR) was designed and synthesized in this work. The results revealed that six of the compounds showed typical AIEE characteristics, with fluorescence emissions from purple, blue, cyan to green, tunable by changing substituent groups. This flavone-based AIEE system has never been reported before. The AIEE characteristics were investigated by optical spectroscopy, fluorescence photographs, scanning electron microscopy (SEM), fluorescence quantum yields (ФF) and fluorescence lifetime in the CH3OH/H2O mixed solution. Moreover, benefiting from the simple structures and small molecular weight, they could permeate cells faster than current high-molecular-weight AIEE molecules. Furthermore, to examine possible biomedical applications, fluorescence imaging in living A549 lung cells and cell viabilities were examined, and the results displayed that these fluorophores showed good cellular uptake and low cytotoxicity within the experimental concentration range. In addition, these AIEE compounds possessed excellent specificity for mitochondrial targeting and mitochondrial morphological change tracking, besides, they displayed superior photostability, which indicated they are potential candidates for mitochondrial imaging.Keywords:AIEE;multicolor;flavone;fluorophores;mitochondria
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 35
·19701-19706
·
IF 2.936
Zhixiang Lu,Yunming Liu,Shuhan Lu,Yuan Li,Xiaolan Liu,Yu Qin,Liyan Zheng
The detection of Ag+ in the environment is very important to determine the level of pollution from silver complexes, which have caused various human health problems. Herein, an aggregation-induced emission (AIE) chromophore (tetraphenylethane, TPE) attached to a benzimidazole group (tetra-benzimidazole, TBI–TPE) is synthesized and utilized to detect Ag+ in the environment. The strong chelating effect between the benzimidazole group and Ag+ leads to the formation of aggregates, and strong yellow fluorescence signals were observed after adding Ag+ into a TBI–TPE solution. The stoichiometry of the complex of TBI–TPE and Ag+ was established to be 1 : 2 using photochemical and mass spectra measurements. The detection limit of the Ag+ assay is 90 nM with a linear range from 100 nM to 6 μM. This study provides a facile method to determine Ag+ in real environmental samples with satisfactory results.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2018
·
IF 4.908
Honghua Zhang,Hongguo Tang,Jiakuo Xu,Yajing Li,Zhiqiang Yang,Ruixia Liu,Suojiang Zhang,Yanji Wang
The aromatic-compound additive in sulfuric acid (H 2 SO 4 ) was found to promote isobutane/butene alkylation significantly. The selectivity of isooctane (C 8 ) and the alkylate research octane number increased by 23.46% and 5.09, respectively, when thiophene was added to H 2 SO 4 , especially. The proportion of trimethylpentanes can be improved from 58.57% to 84.58%, and the ratio of trimethylpentanes to dimethylhexanes was doubled, compared with that in the presence of H 2 SO 4 alone. The improved performance in the presence of thiophene additive in H 2 SO 4 is attributed to the improvement in carbenium-ion stability and the acceleration of hydrogen proton release, because of the existence of electron-rich π-bond compounds, and the substitution of thiophene in the alpha site by the sulfonic group and isobutane/butene. Reaction parameters such as reaction temperature, reaction time, stirring speed, feed rate, and acid/hydrocarbon volumetric ratio were also investigated in detail. The synergetic mechanism of thiophene-H 2 SO 4 on isobutane/butene alkylation was also speculated.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Runyuan Ma,Liang Wang,Hai Wang,Ziyu Liu,Mingyang Xing,Longfeng Zhu,Xiangju Meng,Feng-Shou Xiao
Photocatalytic synthesis of hydrogen peroxide (H 2 O 2 ) from water and oxygen is an alternative route for clean energy storage and chemical synthesis, but still having problems with insufficient H 2 O 2 productivity and solar-to-chemical energy conversion efficiency. Herein, we reported a hybrid catalyst of proton-form titania nanotube with carbon dot (HTNT-CD) that is highly efficient for the production of H 2 O 2 under visible-light irradiation (λ > 420 nm, H 2 O 2 productivity at 3.42 mmol g cat −1 ⋅h −1 ), outperforming the titania catalysts containing noble metals and the carbon nitride catalysts reported previously. Multiple studies demonstrate that the protons on the HTNT-CD are crucial for the production of H 2 O 2 by efficiently accelerating the half reaction of molecular oxygen reduction to form H 2 O 2 , and effectively hindering H 2 O 2 decomposition under the irradiation conditions. This HTNT-CD catalyst gives solar-to-H 2 O 2 apparent energy conversion efficiency at 5.2%, which is even 4.9 times of that (1.06%) over the catalyst derived from commercial P25 and CDs. More importantly, the HTNT-CD is stable, giving high H 2 O 2 productivity in the continuous recycle tests.
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2018
·
IF 3.789
Pei Yuan,Xiaoling Li,Wangyang Wang,Haiyan Liu,Yan Yan,Haifeng Yang,Yuanyuan Yue,Xiaojun Bao
A series of SBA-15 with different modifications have been successfully prepared and applied as adsorbents to remove polycyclic aromatic hydrocarbons (PAHs) from aqueous solutions. The morphology and structural properties of the chemically modified materials are all similar to those of pure SBA-15, and thus the difference of PAHs adsorption capacity can be directly attributed to the different functional groups, which is favorable to deeply explore the adsorption mechanism. Adsorption kinetics and isotherm experiments for naphthalene (Nap), anthracene (Ant), and pyrene (Pyr) were carried out, and the results reveal that the adsorption processes follow a pseudo-second-order rate equation and the equilibrium can be achieved within 120 min for Nap and Ant, whereas only 90 min for Pyr, indicating that the more hydrophobic molecules, the easier and faster adsorption can be obtained. All of the adsorption isotherms fit well with the Freundlich model, suggesting the unevenly distributed active sites on adsorbents. The phenyl-functionalized materials possess the highest adsorption capacity, implying that the π–π interaction is the most primary interaction and plays the predominant role in the studied PAHs adsorption, superior to the acidic and hydrophobic interaction. Our research sheds light on the design and synthesis of advanced and highly efficient adsorbents to remove PAHs from aqueous solutions.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Jizhen Jia,Changkun Liu,Lin Wang,Xiaoyan Liang,Xiaoyan Chai
In this study, a multi-functional cotton fiber was prepared and investigated for the visual detection and enhanced adsorption of cadmium (Cd) ions in aqueous solutions. SI-ATRP technology was used to graft poly (glycidyl methacrylate) (PGMA) and poly (3-sulfopropyl methacrylate potassium salt) (PSMP) successively on the surface of the cotton fiber. Then, diethylenetriamine (DETA) and 5,10,15,20-tetrakis(1-methy-4-pyridinio)porphyrin tetra(p-toluenesulfonate) (TMPyP) were immobilized onto the PGMA and PSMP polymer brush, respectively, to form the Cotton-PGMA(DETA)-PSMP(TMPyP) (abbreviated as C-PD-PT) material. C-PD-PT showed enhanced Cd ion adsorption with the maximum adsorption capacity of 1.6215 mmol/g derived from the Langmuir model fitting. In addition, The C-PD-PT material exhibited simple visual detection of Cd ions with a remarkable color change from brownish to green. A linear relationship between the light absorbance of C-PD-PT-Cd (C-PD-PT adsorbed with Cd ions) and the initial concentrations of Cd ions was established, which would be used for the fast determination of Cd ion concentrations in aqueous solutions.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 46
·26255-26265
·
IF 2.936
Xuzhao Yang,Yun Fang
Ammonium-based room-temperature asymmetrical gemini ionic liquids, 1-trimethylammonium-3-(pyridinium)propane bisdicyanamide ([N111C3Py][DCA]2) and 1-trimethylammonium-3-(1-methylpiperidinium)propane bisdicyanamide ([N111C3MPi][DCA]2) were respectively synthesized and structurally characterized by 1H NMR and 13C NMR. Thermal stability of the gemini ionic liquids was determined by thermogravimetric analysis under a pure nitrogen atmosphere. Densities and viscosities of pure GILs and their binary mixtures with acetonitrile (MeCN) were investigated over the entire range of mole fractions at various temperatures, from 288.15 to 333.15 K, under atmospheric pressure. Moreover, the excess molar volumes (VEm) and the viscosity deviations (Δη) of the binary mixtures were evaluated and well fitted to the Redlich–Kister polynomial expression. The negative values of VEm and Δη result from strong self-association and interaction between the gemini ionic liquid molecules and MeCN. Results are discussed in terms of molecular interactions and structures.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2018
·
IF 3.767
Longbin Xu,Xu He,Pinyi Ma,Xin Liu,Fangmei Zhang,Ying Sun,Daqian Song,Xinghua Wang
Alkaline phosphatase (ALP) is an essential enzyme in various tissues, which has been reported to be extensively involved in various physiological and pathological processes. Fluorescent probe assays carried out in vivo are desirable for monitoring the ALP activity. In this study, a novel red-light fluorescent DHP probe, which exhibited good selectivity and high sensitivity, for monitoring the ALP activity in real time was described. The DHP probe exhibited good water solubility, and the detection limit of ALP was determined as 0.031 U/L; this value is almost less than those of the other probes reported previously. The probe exhibited high selectivity, which will not interfere with various enzymes and amino acids. Moreover, the sensing and luminescence mechanisms of ALP to DHP was investigated by density functional theory (DFT) and time-dependent DFT. Furthermore, the DHP probe was applied for the detection of endogenous ALP in BEL-7402 cells, and the fluctuation of the ALP levels in BEL-7402 and HEK 293 T cells was successfully tracked by fluorescence microscopy .
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）