COLLOID AND POLYMER SCIENCE
·
2018
·Vol. 296
·期 8
·1365-1372
·
IF 1.967
Zhang Rongli,Jin Zhenzhen,Zhang Cuige,Yang Renchun,Sun Mingyue,Wong Ching-Ping
A kind of electroactive nanoparticles (NPs) was prepared in solution by self-assembling amphiphilic 3-thiophenecarboxylic acid-modified starch (TPCA-St), which was synthesized through esterification reaction. By casting TPCA-St NPs on the surface of gold electrode and subsequent electropolymerization of the thiophene moieties in NP film, the electroconductive TPCA-St NP-based film was formed. After horseradish peroxidase and Nafion were sequentially cast on the film surface, a biosensor was successfully prepared. The prepared biosensor showed high sensitivity for H 2 O 2 detection. The linear range from 1 × 10 −10 to 1 × 10 −5 mol L −1 with a detection limit of 3 × 10 −11 mol L −1 was obtained for H 2 O 2 sensing. The biosensor also showed good repeatability and stability, and it has been successfully used to sense H 2 O 2 in commercial disinfector with satisfactory results.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2018
·Vol. 89
·期 2
·492-499
·
IF 1.745
Wang Li,Li Jing,Wang Meiri,Liu Yuanyuan,Cui Hongtao
Abstract 2D nanostructured Co 2+ -doped β-Ni(OH) 2 as electrode material for application in redox-type supercapacitors was synthesized by a strategy of nickel complex template. The 2D Co 2+ -doped β-Ni(OH) 2 was produced by the in situ reaction of 2D Co 2+ -doped template in strong alkaline electrolyte solution during electrochemical measurement. Due to the large interface and the promoted conductivity induced by Co 2+ doping, the Co 2+ -doped β-Ni(OH) 2 exhibited high electrochemical performance. It had high specific capacitance of about 2100 F g –1 at low current density of ~2 A g −1 . It also exhibited excellent high rate performance (1259 F g –1 at high current density of 41.7 A g −1 ), much higher than the undoped sample. The results in this work indicated that the Co 2+ -doped β-Ni(OH) 2 could be used as an effective electrode material in redox supercapacitors.
2D nanostructured Co 2+ -doped β-Ni(OH) 2 as electrode material for application in redox-type supercapacitors was in situ synthesized by a strategy of nickel complex template. Due to the large interface and the promoted conductivity induced by Co 2+ doping, the as-synthesized material exhibited excellent high rate electrochemical performance.
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IONICS
·
2018
·Vol. 24
·期 12
·3975-3982
·
IF 2.347
Wang Lu,Luo Hang,Zhou Xuefan,Wei Anqi,Zhou Kechao,Chen Zhuo,Zhang Dou
As the electronic industry developed rapidly, greater demands are required on the performance of dielectric composites, such as high permittivity, low dielectric loss, and high-energy density. Improving the compatibility of fillers in polymer matrix and uniform distribution of the electric field could increase the permittivity of such composites. Therefore, BaTiO 3 nanoparticles were coated by TiO 2 sol to fabricate BaTiO 3 @TiO 2 core-shell structured fillers in this paper. BaTiO 3 @TiO 2 fillers with gradient permittivity were firstly modified by dopamine in order to disperse in the composites homogeneously and adhere to poly(vinylidene fluoride- co -hexafluoropropylene) (P(VDF-HFP)) matrix tightly. At 1 kHz, the permittivity of the composite with 20 vol% BaTiO 3 @TiO 2 was 32.15, obviously larger than that of pure P(VDF-HFP) (6.92), and the dielectric loss was just 0.052. Consequently, the discharged energy density of the composite was enhanced to 0.23 J/cm 3 at 40 kV/mm, which was two times higher than that of pure P(VDF-HFP). This work provides a feasible approach to prepare high-performance dielectric composites.
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Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-8
·
IF 3.125
Yue Tian-Tian,Li Xiao,Wang Xiao-Xiong,Yan Xu,Yu Miao,Ma Jian-Wei,Zhou Yu,Ramakrishna Seeram,Long Yun-Ze
Electrospinning provides an effective method for generating nanofibers from solution of carboxymethyl chitosan/polyoxyethylene oxide (CMCS/PEO). The goal of this work is to explore the potential application of electrospun CMCS/PEO nanofiber membrane in fruit fresh-keeping. The microstructure, antibacterial activity, hydrophilia, and air permeability of the nanofiber membrane have been tested. For comparison, the fresh-keeping effects of commercial cling wrap and CMCS/PEO nanofiber membranes on strawberries’ rotting rate and weight loss rate have been studied. The results indicate that the electrospun CMCS/PEO membrane could effectively avoid water loss in strawberries and has a remarkable effect to prolong strawberries’ shelf life due to its breathability and antibacterial activity. In addition, the composite CMCS/PEO, nanofiber membrane is non-poisonous and edible, which can be used in food industry.
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PubMed
高影响因子
CATALYSIS LETTERS
·
2018
·Vol. 148
·期 10
·3112-3118
·
IF 2.911
Han Yan,Yang Yawei,Zhao Jianqiu,Yin Xingtian,Que Wenxiu
Abstract Ternary Cu 2 SnS 3 (CTS) and Cu 2 SnSe 3 (CTSe) quantum dots were grown in-situ on reduced graphene oxide (rGO) nanosheets by a facile one-pot colloidal synthesis. Possessing abundant active sites and having the ability to harvest solar energy and to facilitate charge separation, the CTS(e)/rGO 0D/2D nanocomposites showed remarkably enhanced photocatalytic activities for degradation of rhodamine B and methyl orange aqueous solutions upon visible light irradiation. The nanocomposites of rGO supported monodispersed quantum dots were proved to be a suitable platform for photocatalytic applications due to the well-maintained 0D/2D nanostructure. Graphical Abstract
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 9
·1-9
·
IF 5.705
Wang Jing,Li Haigang,Li Tingting,Ling Liansheng
A one-step, one-tube colorimetric assay is described for the detection of bacterial double-stranded DNA (dsDNA). It utilizes a G-quadruplex DNAzyme produced by an asymmetric polymerase chain reaction (As-PCR) that catalyzes the oxidation of cysteine to form cystine. This results in the formation of oligonucleotide-modified gold nanoparticles via triplex formation, and eventually in a color change from red to blue that occurs within about 10 mins. This can be measured by ratiometric colorimetric (at 525 and 600 nm). The limit of detection (LOD) for the model analyte (dsDNA of Staphylococcus aureus ( S. aureus )) is as low as 0.28 pg per 0.05 mL with a good linear response ranging from 16.0 fg·μL −1 to 1.6 ng·μL −1 . This is much lower than previously reported LODs. The assay is highly selective for S. aureus dsDNA over a range of other bacterial DNAs. Conceivably, it provides an attractive alternative tool for rapid detection of bacterial dsDNA as required in pathogen screening in the food industry.
Schematic presentation of a colorimetric assay for bacterial DNA. It is based on the catalytic activity of a G-quadruplex DNAzyme that is formed by an asymmetric PCR involving triplex DNA formation and gold nanoparticle (AuNPs) aggregation.
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高影响因子
FIBERS AND POLYMERS
·
2018
·Vol. 19
·期 7
·1522-1531
·
IF 1.353
Hu Jiangtao,Gao Qianhong,Xu Lu,Wang Minglei,Zhang Maojiang,Zhang Kuo,Guo Xiaojing,Liu Weihua,Wu Guozhong
Herein we report a simple and reproducible method for fabricating highly durable and robust superhydrophobic and superoleophilic cotton fabrics via simultaneous radiation-induced graft polymerization of glycidyl methacrylate and subsequent chemical modifications with aminopropyltriethoxysilane and hexamethyldisilazane. The chemical structure and the surface topography of the pristine and the modified cotton fabrics were investigated in detail by ATR-FTIR, XPS, and 29 Si NMR, and a grafting layer was successfully immobilized onto the surface of the cotton fabric by forming covalent bonds. Multi-dimensional surface roughness was created by combining micro-sized fibers of the cotton fabric, nanoscaled protuberances of the grafting chain, and molecular level spherical projection points of silicon methyl. The superhydrophobic cotton fabric exhibited long-term stability, ultra-high durability and robustness, and maintained its properties even after 25 wash cycles. The fabric also showed excellent water repellency with a water contact angle of 153 ° and a high efficiency of oil/water separation (98 %). The superhydrophobic/superoleophilic cotton fabric developed in the present work exhibits important potential applications in superhydrophobic textiles and oil/water separation.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2018
·Vol. 20
·期 12
·1-8
·
IF 2.127
Dai Xiaohui,Han Zhenwei,Fan Hai,Ai Shiyun
Heteroatom doping can drastically alter electronic characteristics of carbon nitride quantum dots, thus resulting in unusual properties and related applications. Herein, we used sulfur as the doping element and investigated the influence of doping on the electronic distribution of carbon nitride and the corresponding fluorescent property. A simple synthetic strategy was applied to prepare sulfur-doped carbon nitride (S-g-C 3 N 4 ) quantum dots through ultrasonic treatment of bulk S-g-C 3 N 4 . Characterization results demonstrated that the prepared S-g-C 3 N 4 quantum dots with an average size of 2.0 nm were successfully prepared. Fluorescent properties indicated that S-g-C 3 N 4 quantum dots have an emission peak at 460 nm and cover the emission spectra region up to 550 nm. Furthermore, the fluorescent intensity is greatly increased due to the sonication of bulk S-g-C 3 N 4 into quantum dots. As a result, S-g-C 3 N 4 quantum dots not only show a blue cell imaging, but have a bright green color. Therefore, S-g-C 3 N 4 quantum dot is a promising candidate for bioimaging benefiting from the efficient fluorescent property, good biocompatibility, and low toxicity.
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高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2018
·Vol. 29
·期 1
·59-65
·
IF 1.754
Yang Zhenglong,Fu Kangyu,Yu Jing,Liu Xinyan
The organic/inorganic hybrid material of poly[2-(dimethyl amino)-ethyl methacrylate]/polyhedral oligomeric silsesquioxane (POSS–PDMAEMA) was synthesized via a thiol-Michael addition reaction. The structures of POSS–PDMAEMA and its self-assembly in aqueous solution were confirmed by 1 H-NMR, TEM, DLS, UV–Vis and fluorescence spectrum. In aqueous solutions, POSS–PDMAEMA could self-assemble into micelles and its critical micelle concentration was 12.4 mg/L. POSS–PDMAEMA micelles can adsorb dyes efficiently, it could adsorb methyl red at a concentration of 10–100 mg/L and dithizone at a concentration of 20–100 mg/L, and could remove 98% methyl red and 90% dithizone within 30 s. Due to the good temperature and pH responsiveness, POSS–PDMAEMA micelles could release organic dye absorbed into the organic solution again when the solution was heated to 40 °C or pH value of the solution was adjusted to 4.0. It suggested that POSS–PDMAEMA can be utilized as an interesting “smart” materials for absorption of organic dyes.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 26
·期 33
·33847-33855
·
IF 2.8
Wang He-xuan,Zhu Li-nan,Guo Fu-qiao
Atrazine, one of the most widespread herbicides in the world, is considered as an environmental estrogen and has potential carcinogenicity. In this study, atrazine was degraded on boron-fluorine co-doped TiO 2 nanotube arrays (B, F-TiO 2 NTAs), which had similar morphology with the pristine TiO 2 NTAs. The structure and morphology of TiO 2 nanotube samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and UV-visible diffuse reflectance spectroscopy (DRS). It showed that the decoration of fluorine and boron made both the absorption in the visible region enhanced and the band edge absorption shifted. The efficiency of atrazine degradation by B, F-TiO 2 NTAs through photoelectrocatalysis was investigated by current, solution pH, and electrolyte concentration, respectively. The atrazine removal rate reached 76% through photoelectrocatalytic reaction by B, F-TiO 2 NTAs, which was 46% higher than that under the photocatalysis process. Moreover, the maximum degradation rate was achieved at pH of 6 in 0.01 M of Na 2 SO 4 electrolyte solution under a current of 0.02 A and visible light for 2 h in the presence of B, F-TiO 2 NTAs. These results showed that B, F-TiO 2 NTAs exhibit remarkable photoelectrocatalytic activity in degradation of atrazine.
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高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 7
·1-9
·
IF 5.705
Li Xinpei,Sun Ying,Yuan Liming,Liang Li,Jiang Yanxiao,Piao Huilan,Song Daqian,Yu Aimin,Wang Xinghua
This work describes a nanohybrid material consisting of gold nanoparticles (AuNPs) and nanosheets of layered double hydroxides (NLDHs) of Mg(II) and Al(III). Mono-disperse AuNPs were immobilized on the surface of the LDHs via Au-O bonding. The nanohybrid sorbent was packed in an organic filter along with a syringe and applied to the microextraction of triazine herbicides with the help of an injection pump. The collected hexane eluate was concentrated and directly injected into a HPLC column for quantification. The effects of the amount of Au/LDH nanohydrobrids, type, flow rate, volume of washing and eluting solvent were optimized. The method was validated by detecting four triazine herbicides (prometryn, atrazine, terbumeton and secbumeton) in spiked maize. The limits of detection range between 35 and 108 pg g −1 . The relative standard deviations range from 1.0–6.9% for repeatability and 4.6–7.8% for reproducibility (for n = 5).
Schematic presentation of a nanohybrid material consisting of gold nanoparticles and nanosheets of layered double hydroxides of Mg(II) and Al(III) (Au/LDH) for use as an adsorbent for microextraction in a packed syringe. Organic filter heads were used as the container of Au/LDHs nanohybrids, and were connected with the syringes installed on the injection pump for the semi-automatic microextraction and preconcentration of triazines in maize.
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高影响因子
MACROMOLECULAR RESEARCH
·
2018
·Vol. 26
·期 9
·800-807
·
IF 1.767
Wang Chao,Li Zhenhuan,Cao Lei,Cheng Bowen
Polyphenylene sulfide (PPS) membranes were modified by chloromethylation and quaternary amination reaction to prepare a hydrophilic PPS microporous membrane. The structures of the modified PPS membranes were characterized by the use of Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy. The results showed that the modified membranes maintain the same microporous structures as the PPS membrane. The hydrophilicity of the modified membranes was significantly improved compared to that of the PPS membranes, and the water flux of N-methylimidazole modified membranes, triethylamine modified membranes, and both mixture modified membranes achieved 110.475, 168.94, 150.59 L·m −2 ·h −1 , respectively. The quaternary amination of the PPS membranes made much less bovine serum albumin (BSA) pollution accumulation on the top surface of the modified membranes, and there was a significant improvement, to 94%, in the BSA rejection rate. Most importantly, the antibacterial activity of the modified membranes was effectively improved, and the bactericidal rate was elevated to above 80% in comparison with pure PPS membranes, which was attributed to the introduction of quaternary ammonium salts and imidazolium salts in out-surface of the membranes.
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