JOURNAL OF MATERIALS RESEARCH
·
2014
·Vol. 29
·期 24
·2934-2941
·
IF 1.815
Hongxu Guo,Di Guo,Zishan Zheng,Weng Wen,Jianhua Chen
Zn3(VO4)2 nanorods with visible light-driven photocatalytic activity were prepared by hydrothermal reaction and characterized by x-ray diffraction, Fourier transform infrared, scanning electron microscopy, x-ray photoelectron spectroscopy, UV–vis diffuse reflectance spectra, and Brunauer–Emmett–Teller surface area and pore size analyzer. The Zn3(VO4)2 nanorods consisted of rods with a thickness of approximately 30 nm, length in the range 400–600 nm, and width in the range 150–250 nm. The photocatalytic degradation activities for methylene blue (MB) and 4-nitrophenol (4-NP) over the Zn3(VO4)2 nanorods were studied in detail. The photocatalytic activity of the as-prepared photocatalyst for MB and 4-NP in visible light under the same conditions was about 3.5 times and 2.5 times higher than that of N–TiO2, respectively. The main active species in the photodegradation come from •OH, and the photogenerated electrons also partly involved in the photocatalytic degradation process, in which the •OH radicals formed were in proportional to the light illumination time obeying zero-order reaction rate kinetics.
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RSC Advances
·
2015
·Vol. 5
·期 59
·47820-47829
·
IF 3.84
Ziyang Lu,Ming He,Lili Yang,Zhongfei Ma,Li Yang,Dandan Wang,Yongsheng Yan,Weidong Shi,Yang Liu,Zhoufa Hua
A novel imprinted CoFe2O4/MWCNTs photocatalyst was prepared through the combination of a hydrothermal method and suspension polymerization based on 2-mercaptobenzothiazole (MBT) as the molecular template, pyrrole as the imprinted functional monomer and conductive polymerizable monomer, and CoFe2O4/MWCNTs as the matrix material. The results indicated that the surface imprinted layer was successfully coated on the surface of CoFe2O4/MWCNTs and polypyrrole (PPy) was formed and existed in the surface imprinted layer, the magnetic saturation value of the novel imprinted CoFe2O4/MWCNTs photocatalyst was 19 emu g−1. Moreover, compared with other photocatalysts, the novel imprinted CoFe2O4/MWCNTs photocatalyst not only had a high photocatalytic efficiency (57.09%), but also possessed a strong ability for selective recognition and photodegradation of MBT (the coefficients of selectivity of the novel imprinted CoFe2O4/MWCNTs photocatalyst relative to CoFe2O4/MWCNTs and the non-imprinted CoFe2O4/MWCNTs photocatalyst was 3.37 and 3.28, respectively). In addition, in the process of the photodegradation reaction, h+ and ˙OH were the main oxidative species, ˙O2− played a very small role.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 31
·
IF 1.768
Yan Yang,Funian Mo,Yangyang Chen,Yingyi Liu,Shaojun Chen,Jiandong Zuo
Researchers are actively developing shape memory polymers (SMPs) for smart biomaterials. This paper reports a new SMP system synthesized from biocompatible 2-(dimethylamino) ethyl methacrylate (DMAEMA), butyl acrylate (BA) and tri(ethylene glycol) divinyl ether (TDE). Preliminary results show that the DMAEMA-co-BA-co-TDE copolymers form micelles in aqueous solution due to chemical crosslinking and hydrophobicity. The micelle size decreased with the increase in the BA content since the hydrophobicity of copolymers increases with the increase of BA content. The resulting polymer films contain–N(CH 3 ) 2 functional groups for further biomaterial applications. The thermal stability of DMAEMA-co-BA-co-TDE copolymers is determined by the DMAEMA structure and content. Moreover, the copolymers form micro-phase-separated structures containing a reversible amorphous soft phase, and the storage moduli decreases significantly around T g . Therefore, good thermal-induced shape memory effects are achieved in the DMAEMA-co-BA-co-TDE copolymers by adjusting the BA content. This work proposes a new strategy for designing smart biomaterials using a biocompatible monomer. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42312.
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Scientific Reports
·
2015
·Vol. 5
·期 1
·1-14
·
IF 5.578
Liao Hanpeng,Zheng Haiping,Li Shuixian,Wei Zhong,Mei Xinlan,Ma Hongyu,Shen Qirong,Xu Yangchun
A multiple xylanase system with high levels of xylanase activity produced from Penicillium oxalicum GZ-2 using agricultural waste as a substrate has been previously reported. However, the eco-physiological properties and origin of the multiplicity of xylanases remain unclear. In the present study, eight active bands were detected using zymography and all bands were identified as putative xylanases using MALDI-TOF-MS/MS. These putative xylanases are encoded by six different xylanase genes. To evaluate the functions and eco-physiological properties of xylanase genes, xyn10A , xyn11A , xyn10B and xyn11B were expressed in Pichia pastoris . The recombinant enzymes xyn10A and xyn10B belong to the glycoside hydrolase (GH) family 10 xylanases, while xyn11A and xyn11B belong to GH11 xylanases. Biochemical analysis of the recombinant proteins revealed that all enzymes exhibited xylanase activity against xylans but with different substrate specificities, properties and kinetic parameters. These results demonstrated that the production of multiple xylanases in P. oxalicum GZ-2 was attributed to the genetic redundancy of xylanases and the post-translational modifications, providing insight into a more diverse xylanase system for the efficient degradation of complex hemicelluloses.
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PubMed
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AQUACULTURE RESEARCH
·
2016
·Vol. 48
·期 5
·2278-2290
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IF 1.606
Jing Qian,Chunhua Ren,Ting Chen,Jianjun Xia,Zonghe Yu,Yan Gao,Chaoqun Hu
The broad-spectrum protease inhibitor alpha-2-macroglobulin (α 2 M) is widely found in vertebrates and invertebrates. However, no research regarding α 2 M has been described in sea cucumbers to date. In this study, the first sea cucumber α 2 M named Stm α 2 M was identified from Stichopus monotuberculatus , a tropical species with high edible and economic values in Southern China. The Stm α 2 M cDNA is 5276 bp in length, containing a 5′-untranslated region (UTR) of 279 bp, a 3′-UTR of 344 bp and an open reading frame of 4653 bp that encodes a protein of 1550 amino acids. The Stmα 2 M possesses all the three characteristics of known α 2 M proteins, including the bait region domain, thioester domain and receptor-binding domain. Higher levels of mRNA expression were noticed in intestine, respiratory tree, coelomocytes and tentacle of S. monotuberculatus . Transcriptional expression of Stm α 2 M showed the strongest response to lipopolysaccharides (LPS, 8.19-fold up-regulation) after 6 h post-challenge in coelomocytes. In addition, the α 2 M activity was detected in S. monotuberculatus and protein activity of α 2 M increased remarkably at 6 h after LPS stimulation. As a whole, this study indicated that Stmα 2 M is an important immune-related molecule, and the study on functions of Stmα 2 M may provide some new and valuable ideas for preventing and controlling diseases of cultured sea cucumbers.
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MACROMOLECULES
·
2016
·
IF 5.554
Xu Li,Bolin Li,Xiaodong Zhang,Chengcheng Li,Zhirui Guo,Dongshan Zhou,Xiaolin Lu
Understanding the interfacial molecular structures of antifouling polymers in solutions is extremely important in research and applications related to chemistry, biology, and medicine. However, it is generally challenging to probe such buried solid/liquid interfaces in situ. We herein report a molecular-level study on detecting the interfacial molecular structures of an antifouling hydrogel material, poly(2-hydroxyethyl methacrylate) (PHEMA), in contact with water and bovine serum albumin (BSA) solution in situ using sum frequency generation (SFG) vibrational spectroscopy. To compare to and validate our in situ experiments, molecular-level structures of the substrate/PHEMA interface before and after water exposure were also detected. The detected strong O–H vibrational signals from water and hydroxyethyl and carbonyl vibrational signals from PHEMA prove that the PHEMA surface hydration was attributed to the interaction between water and PHEMA side hydrophilic groups. SFG experimental results verify that the adsorbed BSA molecules at the PHEMA/solution interface were disorderly arranged, supported by data from the laser scanning confocal microscopic (LSCM) experiment. This indicates the weak interaction between the BSA molecules and PHEMA surface. This direct detection of the surface hydrated structures of PHEMA sheds light on understanding the interfacial properties of antifouling materials in aqueous environments. The capability reported here to probe the PHEMA/solution interface and the hidden substrate/PHEMA interface after water exposure can be applied to investigate a broad range of interfaces of antifouling materials.
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JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
·
2016
·
IF 1.733
Jingjing Yao,Decheng Zeng,Yangxin Zhang,Dongdong Sun,Endong Yang,Haiping Liu,Feng Guo,Weiyun Wang
The effect of ethanol or acetone, as oil phase solvents, upon the form of paeonol-loaded poly(butyl-2-cyanoacrylate) encapsulated nanocapsules (Pae@PNCs) by interfacial spontaneously polymerization were investigated. Pae@PNCs characterizations including morphology, radius distribution, polydispersity index (PDI), particle size, zeta potential, entrapment efficiency (EE%), drug loading (DL%) and in vitro paeonol release kinetics were evaluated. Results show that 100% acetone have a significant effect on forming nanocapsules, which showed the smaller size (168.3 ± 6.76 nm) under scanning electron microscopy (SEM) and one radius distribution by the particle size analyser. The data showed that using 100% acetone to prepare Pae@PNCs was leading to smaller particle size and lower polydispersity index (PDI), higher zeta potential, better EE (%) and perfect DL (%), which is linear decrease in radius (r2 = 0.939) and PDI (r2 = 0.974) and linear increase EE% (r2 = 0.9879) and DL% (r2 = 0.9892) with the acetone concentration (range 10–100% v/v). Paeonol encapsulated into and adhered on PNCs were confirmed by UV–Visible spectra (UV–Vis), Fourier transform infrared spectroscopy (FTIR) and Differential scanning calorimetry (DSC). Drug release behavior in vitro showed that 100% acetone as solvents on developing Pae@PNCs have greater advantages in controlling and prolonging paeonol release. Results demonstrated that solvents have a significant influence on forming Pae@PNCs.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 1
·582-587
·
IF 1.798
Cao Renping,Wang Wudi,Zhang Jinlong,Hu Qianglin,Jiang Shenhua,Xiao Fen,Ye Yuanxiu
CaZr(PO 4 ) 2 :Mn 2+ and CaZr(PO 4 ) 2 :Mn 2+ , Sm 3+ phosphors are synthesized by high-temperature solid state reaction method in air. CaZr(PO 4 ) 2 :Mn 2+ phosphor shows green emission and its broad emission band peaking at ~545 nm within the range 470–650 nm is attributed to the 4 T 1 (G) → 6 A 1 ( 6 S) transition of Mn 2+ ion. The optimal Mn 2+ doping concentration is ~5 mol% in CaZr(PO 4 ) 2 :Mn 2+ phosphor. CaZr(PO 4 ) 2 :Mn 2+ , Sm 3+ phosphor with excitation 399 nm emits reddish-orange light, and it shows a systematically varied hue from green to yellow with excitation 405 nm by changing Sm 3+ and Mn 2+ ions concentration. The luminous mechanism of CaZr(PO 4 ) 2 :Mn 2+ , Sm 3+ phosphor is analyzed and explained by the simplified energy level diagrams of Mn 2+ and Sm 3+ ions in CaZr(PO 4 ) 2 :Mn 2+ , Sm 3+ phosphor. The experimental results are helpful to develop new Mn 2+ /Sm 3+ -doped materials.
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CHIRALITY
·
2017
·Vol. 29
·期 5
·172-177
·
IF 1.956
Ai-Hong Duan,Bang-Jin Wang,Sheng-Ming Xie,Jun-Hui Zhang,Li-Ming Yuan
A new enantioselective potentiometric sensor containing R-type chiral porous organic cage CC9 as the chiral selector was designed for the assay of 2-aminobutanol. Optimized membrane electrodes displayed a linear dynamic range from 10 −3 ~ 10 −1 mol·L −1 with a detection limit of 2.5 × 10 −4 mol·L −1 and a Nernstian response of 27 ± 0.5mV·decade −1 toward S-2-aminobutanol within the pH range 7.0–10.0. The potentiometric enantioselectivity coefficient ( ) of this sensor was −1.333, indicating that the porous organic cage-based electrode exhibited good discrimination toward S-2-aminobutanol over R-2-aminobutanol.
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PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2016
·Vol. 408
·期 29
·8317-8323
·
IF 3.125
Yan Zequn,Xue Min,He Qian,Lu Wei,Meng Zihui,Yan Dan,Qiu Lili,Zhou Lijun,Yu Yingjie
A novel polymerized crystalline colloidal array (PCCA) sensing material for the detection of urine glucose was developed by embedding a two-dimensional (2-D) polystyrene crystalline colloidal array (CCA) in 3-acrylamidophenylboronic acid (3-APBA)-functionalized hydrogel. After adjusting the cross-linker concentration, this material showed significant sensitivity for glucose under lab conditions, the particle spacing of the PCCA changed from 917 to 824 nm (93 nm) within 3 min as the glucose concentration increased from 0 to 10 mM, and the structural color of the PCCA changed from red through orange, to green, and finally, to cyan. In further experiments, this material was used to semi-quantitatively detect glucose in 20 human urine (HU) samples. Compared with the traditional dry-chemistry method, which was applied widely in clinical diagnosis, the PCCA method was more accurate and cost-effective. Moreover, this method can efficiently avoid the errors induced by most of the urine-interfering elements like vitamin C and ketone body. With a homemade portable optical detector, this low-cost intelligent sensing material can provide a more convenient and efficient strategy for the urine glucose detection in clinical diagnosis and point-of-care monitoring.
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高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2024
·Vol. 225
·期 19
·2400159
·
IF 2.5
Yuxiao Li,Wentao Liu,Kan Liu,Qingyue Wang,Xiaohui Li,Erlita Mastan,Yuanfeng Wu,Pingwei Liu,Bo Peng,Khak Ho Lim,Wen-Jun Wang
Mechanistic understanding of free radical polymerization (FRP) in aqueous solution is hindered by the lack of kinetic coefficient data. Here, we investigated the propagation rate coefficient ( k p ) for FRP of HEMA in aqueous solution. The k p at 80 °C increased by 6 times as the monomer weight fraction in aqueous system decreases from 100 wt.% to 6 wt.%, that is., from 6.0 × 10 3 to 3.3 × 10 4 L·moL −1 ·s −1 . This increase in k p is associated with the increase in pre-exponential factor ( A ), which suggests an increase in entropy with increasing water molecules in the polymerization system. To investigate the effect of solvent on k p , pulse-laser polymerization in solvents of different hydrogen bonding affinity, that is, 50 wt.% butyl propionate (BP) and dimethyl formamide (DMF), are conducted. The k p obtained are in order of k p , bulk ∼ k p , BP > k p , DMF , suggesting that the intermolecular hydrogen bonding at carbonyl moieties critically affects the geometry of transition state quasi-equilibrium in propagation. We underpinned this observation by analyzing the carbonyl and alkene moieties of HEMA in different solvents using infrared (IR) spectroscopy. The mechanistic analyses and insights relating to hydrogen bonding and functional moieties can be relevant for future studies involving non-aqueous solvents promoting hydrogen bonds.
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RADIATION PHYSICS AND CHEMISTRY
·
2024
·
IF 2.8
Qin Wen,Shizong Wang,Jianlong Wang,Hai Chen,Yuedong Zhou
In this study, the degradation and mineralization of 2-chlorobiphenyl (2-PCB) by gamma irradiation were investigated in the presence of persulfate (PS), to examine the synergistic effect of radiation and persulfate oxidation. The results showed that the absorbed dose required for complete removal of 2-PCB decreased in the presence of PS. In addition, compared to a single irradiation system, the removal efficiency and mineralization of 2-PCB in deionized water , groundwater, and secondary effluent increased when irradiation combined with PS. 2-PCB at concentration of 4 mg L −1 to 8 mg L −1 could be efficiently degraded at a wide pH range (3.0–9.5) in irradiation-activated PS (irradiation/PS) system. The presence of 10 mM or 100 mM of Cl − , NO 3 − , CO 3 2− , and SO 4 2− in irradiation/PS system had no obvious influence on 2-PCB removal. 2-PCB was degraded under the combined action of sulfate radicals (SO 4 •− ) and hydroxyl radicals (·OH), in which ·OH contributed more. The irradiation/PS system is promising to treat PCB-containing wastewater.
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危险品化学品经营许可证（带存储）