FLUID PHASE EQUILIBRIA
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2015
·
IF 2.2
Fang Zhang,Long Wang,Yaocun Tang,Xiaoqiang Gao,Li Xu,Guoji Liu
The solid–liquid equilibrium or the ternary system of 2-methyl-1,4-naphthoquinone + phthalic anhydride + acetone were determined at three temperatures of (283.15, 293.15 and 303.15) K, respectively. Three isothermal phase diagrams of the system were constructed on the basis of the measured solubility. Two pure solid phases were formed at (283.15, 293.15 and 303.15) K, including pure PA and pure 2-MNQ, which were confirmed and determined by the method of Schreine makers' wet residue. The densities of equilibrium liquid phase were determined experimentally at the corresponding temperatures versus mass fraction of component. The phase diagram at 283.15 K is similar to those at (293.15 and 303.15) K and the crystalline fields of 2-MNQ and PA decrease with an increase in temperature. The ternary diagram can provide the fundamental basis for separation of 2-MNQ and PA.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 132
·期 29
·
IF 1.768
Lei Wang,Wen Huang,Shijie Wang,Yuezhi Cui,Pengfei Yang,Xiaodeng Yang,Jonathan V. M. Weaver
pH-Responsive amphiphilic branched copolymers were prepared from poly(ethylene glycol) methyl ether methacrylate (PEGMA), 2-(diethylamino)ethyl methacrylate (DEAEMA), 2-( tert -butylamino)ethyl methacrylate ( t BAEMA), and ethylene glycol dimethacrylate (EGDMA) utilizing a thiol-modified free radical polymerization. The molecular structures of copolymers were confirmed by proton nuclear magnetic resonance spectroscopy ( 1 H NMR) and triple-detection gel permeation chromatography (tri-GPC). The aqueous solution behaviors of the obtained copolymers were investigated by dynamic light scattering (DLS). The DLS data showed that about 16 nm polymer particles comprising of hydrophobic poly( tert -butylamino)ethyl methacrylate (P t BAEMA) and poly(diethylaminoethyl methacrylate (PDEAEMA) core, hydrophilic PEGMA corona were formed above pH 8. With the decrease of pH from 8 to 6, a dramatic increase in the hydrodynamic radius of polymer particles from 16 nm to 130 nm was observed resulting from the protonation of the PDEAEMA segment. Moreover, in vitro drug release behaviors of the resulting polymer assemblies at different pH values were also investigated to evaluate their potential as sustained release drug carriers. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42183.
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JOURNAL OF MEMBRANE SCIENCE
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2013
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IF 4.093
Li-Jing Zhu,Li-Ping Zhu,Jin-Hong Jiang,Zhuan Yi,Yi-Fan Zhao,Bao-Ku Zhu,You-Yi Xu
Here we report the preparation and properties of polyethersulfone (PES) ultrafiltration (UF) membranes with poly( 2 -hydroxyethyl methacrylate) (PHEMA) grafted silica (SiO 2 ) nanoparticles (PHEMA@SiO 2 NPs) as the blending additive. The PHEMA@SiO 2 NPs were first prepared by grafting PHEMA brushes onto SiO 2 NPs via a surface-initiated reversible addition fragmentation chain transfer (RAFT) polymerization. The organic–inorganic hybrid membranes of PES with PHEMA@SiO 2 NPs were fabricated via the traditional non-solvent induced phase separation (NIPS) process. During membrane formation, the hydrophilic PHEMA@SiO 2 NPs tended to migrate toward the membrane top surfaces. The membrane surface porosities were increased and the surface hydrophilicity was enhanced after introducing PHEMA@SiO 2 NPs. More importantly, the water permeability, solute rejection and anti-fouling ability of PES membranes were improved significantly. This phenomenon indicated that the trade-off between permeability and selectivity of PES UF membranes was broken by the incorporation of PHEMA@SiO 2 NPs. Different from traditional neat inorganic NPs additive, the PHEMA@SiO 2 organic–inorganic NPs could be held in/on PES membrane for a long period of time due to the intertwisting of polymer chains. The present work provides a simple approach for stable and nearly permanent hydrophilization of PES UF membranes, which can also be extended to more membrane materials prepared by NIPS process.
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Chemistry-An Asian Journal
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2015
·Vol. 10
·期 5
·1177-1183
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IF 4.587
Shuai Zhao,Haining Wang,Lanxia Xin,Jian Cui,Yehai Yan
Graphical Easy as 2, 3, 4 : 2-(3,4-Dihydroxyphenyl) pyrrolidine grafted graphene was developed as a competent platform for covalent functionalization of graphene, from which four typical but not exclusive graphene-derived materials of magnetic graphene-FeCl 3 complex, phenolic-, epoxide-, and methacryloyl-functionalized graphenes were successfully prepared. Covalent functionalization has proven an effective solution for graphene to realize its revolutionary potential in real applications, whereas the platform strategy (a reactive graphene-based material acting as the platform to undergo post-reactions for generation of various graphene-derived materials) is an attractive option to execute efficiently such a task. This contribution demonstrates that 2-(3,4-dihydroxyphenyl) pyrrolidine (DHPP) grafted graphene, G-OH, is a competent platform. Four typical but not exclusive graphene-derived materials have been prepared from G-OH by using the chemical virtue of each DHPP unit having three categories totaling six reactive sites. The controlled feature of 1,3-dipolar cycloaddition for the synthesis of G-OH ensures that the electronic structure and properties of pristine graphene are succeeded largely by G-OH and thus its derivatives. A promising alternative to graphene oxide, which has been widely used as a platform to prepare the graphene-derived materials but suffers from some intrinsic disadvantages, is thus developed.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2014
·Vol. 19
·期 1
·229-239
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IF 2.234
Zhang J. L.,Liu H. D.,Huang L. H.,Tan S. Z.,Mai W. J.,Cai X.
An advanced electrochemical pseudocapacitor material based on reduced graphene oxide and nickel hydroxide (rGO&Ni(OH) 2 ) was prepared by an easy process where ammonia acted as a pre-stabilizer that could be easily removed. The results showed that the agglomeration and re-stacking of rGO could be effectively prevented, resulting in few-layer rGO nanosheet with high specific surface area of 891.22 m 2 /g which could supply large available area for loading nanoparticle. After the incorporation of Ni(OH) 2 nanoparticle, the rGO&Ni(OH) 2 composite owned excellent electrochemical performance thanks to effective prevention of agglomeration and re-stacking of rGO with large size of the sp 2 domain, no residual of pre-stabilizer of ammonia, and tight contact between rGO and Ni(OH) 2 . Specifically, the rGO&Ni(OH) 2 electrode exhibited excellent stability at scan rates from 100 to 300 mV/s. A high specific capacitance of 1,008 F/g was obtained at high current density of 42 A/g in 6 mol/L KOH aqueous electrolyte, and the specific capacitance demonstrated good rate capability. Moreover, rGO&Ni(OH) 2 electrode showed a long cycle life, retaining 74 % specific capacitance after 2,000 cycles at current density of 6 A/g. The advantages of easy process and excellent electrochemical property suggested great potential application of rGO&Ni(OH) 2 in supercapacitors.
An advanced electrochemical pseudocapacitor material based on reduced graphene oxide and nickel hydroxide was prepared by an easy process where ammonia acted as a pre-stabilizer that could be easily removed. The obtained material owned excellent electrochemical property, including high capacitance, good rate capability, excellent stability, long cycle life, etc.
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INORGANIC CHEMISTRY
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2017
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IF 4.857
Pifu Gong,Siyang Luo,Ke Xiao,Qian Huang,Yi Yang,Hongwei Huang,Yicheng Wu,Chuangtian Chen,Zheshuai Lin
A new perovskite stoichiometric alkali tin dihalides compound, Cs3Sn3F2Cl7, is synthesized by a hydrothermal method. This compound belongs to the monoclinic space group of P21/c with cell parameters of a = 9.5645(4) Å, b = 14.2057(7) Å, c = 13.5828(6) Å, and β = 93.2450(10)°. Unlike the common perovskites in which octahedra are interconnected to be a three-dimensional network, Cs3Sn3F2Cl7 possesses a zero-dimensional structure consisting of Cs+ cations, isolated [SnCl3]− trigonal pyramids, and dimer structural units [Sn2F2Cl4]2–; the latter microscopic unit is found for the first time. The thermal stability and UV–vis–NIR diffuse reflectance spectroscopy in Cs3Sn3F2Cl7 are measured, and the electronic structure is calculated. Interestingly, the 5s2 lone-pair electrons on Sn2+ cations are stereochemically active, which results in a pretty good photocatalytic activity of the title compound.
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POLYHEDRON
·
2015
·
IF 2.011
Kui Ren,Xuefang Shang,Jiajia Fu,Peipei Zhao,Jinlian Zhang
A Copper(II) complex of condensation production was synthesized and its crystal was also obtained by the reaction of 2-(phenylimino-methyl)-phenol with Cu(CH 3 COO) 2 ·H 2 O. The crystal and molecular structure of the complex was determined by single-crystal X-ray diffraction, IR, and HRMS. The Cu(II) ion was four coordinated with two phenolate oxygen and two imine nitrogen atoms in a square-planar geometry. It should be emphasized that the complex demonstrated high selectivity and sensitivity for hydrogen sulfide over other anions (AcO − , H 2 PO 4 − , F − , Cl − , Br − and I − ) followed by the release of copper ion to give a remarkable increase of fluorescence intensity in various organic-aqueous solutions. The synthesized copper complex could be used as a fluoresencent probe for the detection of HS − in the sample of environment, pharmacy, and etc.
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MACROMOLECULAR MATERIALS AND ENGINEERING
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2017
·Vol. 302
·期 6
·1700069
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IF 2.863
Jun-Jiao Yin,Fazli Wahid,Qian Zhang,Yong-Chun Tao,Cheng Zhong,Li-Qiang Chu
A simple strategy to fabricate bifunctional antibacterial coatings via in situ synthesis and incorporation of silver nanoparticles (AgNPs) into quaternized poly(2-(dimethylamino)ethyl methacrylate) (qPDMAEMA) brushes without using any reducing agents is reported. PDMAEMA brushes are prepared on Si wafer substrates via surface-initiated reverse atom transfer radical polymerization, which then are quaternized with ethyl bromide and hexyl bromide, respectively. The resulting qPDMAEMA-AgNP nanocomposite coatings are characterized by using Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscope (FE-SEM), and Raman spectroscopy. FE-SEM and Raman results indicate that the AgNPs with an average diameter of 35 nm are successfully loaded into the qPDMAEMA brushes. Furthermore, the antibacterial activities of the qPDMAEMA-AgNP nanocomposite coatings against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli are investigated by both disc diffusion and colony-forming unit methods. The results show excellent antibacterial properties of the nanocomposite coatings. The influence of the length of the quaternization agents on their antibacterial properties is also investigated.
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Inorganic and Nano-Metal Chemistry
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2017
·
IF 0
Hui-Long Zhu,Yu-Wei Liu,Zong-Ming Tang,Fu-Jun Yin,Wei-Wei Liu,Zhi-Ling Cao,Juan Bao,Meng Li,Ling-Yan Qin,Da-Hua Shi
Two new similar zinc(II) complexes, [ZnCl2L12] and [ZnCl2L22], derived from the 2-amino-1,3,4-thiadiazole derivatives, were prepared and structurally characterized by X-ray diffraction. The Zn atom in each complex has a tetrahedral coordination and is coordinated by two N atoms of the ligands and two Cl atoms. The urease inhibitory activities of the complexes and the ligands were evaluated.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Lu Li,Sihong Xu,Liang Jin,Wenxing Chen,Shichang Chen
It is essential to find a depolymerization system with good catalytic activity, easy operation, and high efficiency for the degradation of waste PET. The synergistic catalytic effect of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) and zinc 2-ethylhexanoate (ZnEH) in PET glycolysis was investigated. Waste PET can be more efficient when completely degraded than single organocatalyst or zinc salt or previous DBU/Zn(OAc) 2 , and the yield of BHET reaches 84.1 % under optimal reaction conditions with the molar ratio of 2:1 of DBU to ZnEH and the weight ratio of 3:1 of EG to PET, the temperature of 180 °C and at 60 minutes. By combining experimental results with density functional theory (DFT) calculations, the synergistic enhancing degradation mechanism that generates hydrogen and coordination bonds is proposed. The purified depolymerization product of BHET was repolymerized to PET, delightfully the r-PET was almost identical to virgin PET.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 24
·35678-35687
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IF 0
Qing Qishun,Zhu Shouwang,Jin Hongyang,Mei Tianhong,Liu Wei,Zhao Songjian
This study effectively addresses the rapid deactivation of manganese-based catalysts in humid environments during ozone decomposition by introducing iron-doped manganese oxide octahedral molecular sieve (Fe-OMS-2) catalysts supported on activated carbon (AC). By optimizing the doping ratio of Fe-OMS-2, the Fe-OMS-2 0.5 /AC catalyst achieves nearly 100% ozone decomposition efficiency across a wide range of relative humidity levels (0 to 60%), even at elevated air flow rates of 800 L·g −1 ·h −1 , outperforming standalone AC, Fe-OMS-2, or a simple mixture of OMS-2 and AC. The Fe-OMS-2 0.5 /AC catalyst features a porous surface and a mesoporous structure, providing a substantial specific surface area that facilitates the uniform distribution of the Fe-OMS-2 active phase on the AC surface. The incorporation of Fe 3+ ions enhances electron transfer between valence state transitions of Mn, thereby improving the catalyst’s efficiency in ozone decomposition. Additionally, the AC component protects catalytic sites and enhances the catalyst’s humidity resistance. In conclusion, this research presents a novel strategy for developing highly efficient and cost-effective ozone decomposition catalysts that enhance dehumidification, significantly contributing to industrial ozone treatment technologies and advancing environmental protection.
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MOLECULAR NEUROBIOLOGY
·
2024
·
IF 4.6
Wang Ajun,Li Nan,Zhang Nan,Liu Jian,Yang Tao,Li Dongxue,Li Changwen,Li Rui,Jiang Tongcui,Xia Chengyu
The pathogenesis and development of Moyamoya disease are still unclear. This study aimed to investigate the effect of desmoglein-2 (DSG2) on Moyamoya disease and determine the inhibitory effect of DSG2 in vascular remodeling in Moyamoya disease. RNA sequencing, immunohistochemistry (IHC), and western blotting were used to detect the expression of DSG2 in the superficial temporal artery (STA) tissues of Moyamoya disease. The association between DSG2 and endothelial cells’ biological activities was investigated by cell counting kit-8 (CCK-8), migration assay, tube formation assay, flow cytometry with Annexin V-FITC/PI staining, and TUNEL apoptotic cell detection kit. Pathways affected by overexpression or knockdown of DSG2 were identified in endothelial cells. The expression of DSG2 in the STA tissues of Moyamoya disease was lower than that in normal controls. Overexpression of DSG2 inhibits the proliferation and migration but promotes apoptosis in endothelial cells, and low DSG2 levels result in impaired angiogenesis. In addition, there was an interaction between DSG2 and MMP-9, and DSG2 acted through the PI3K signaling in endothelial cells. Our results indicate that DSG2 affects PI3K signaling in vascular endothelial cells, and MMP-9 is involved in DSG2-mediated vascular changes in Moyamoya disease.
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