JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 21
·6289
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IF 1.901
Kai He,Cheng Qin,Qingkun Wen,Chengwei Wang,Baoxiang Wang,Shoushan Yu,Chuncheng Hao,Kezheng Chen
Hierarchical polyaniline/polypyrrole (PANI/PPy) copolymer nanofiber was prepared via a two-step method and adopted as dispersing materials for electrorheological (ER) fluids. The first step was used to synthesize PANI nanofibers by a rapid mixing method. Subsequently, the PANI/PPy copolymer nanofibers with a rough surface were obtained using an in situ polymerization method continuously. The morphology of the resultant PANI/PPy copolymer nanofibers can be controlled by varying the amount of Py monomer in the secondary in situ polymerization method. The rough surface of PANI/PPy copolymer nanofibers were confirmed by scanning electron microscopy and transmission electron microscopy. The diameter of PANI/PPy nanofiber is within the range 100–200 nm. The obtained PANI/PPy copolymer particles all exhibit amorphous structure through X-ray diffraction measurement. We also demonstrated that the hierarchical PANI/PPy copolymer nanofibers exhibited characteristic ER behaviors, which were investigated using a Haake rotational rheometer at various electric field strengths. The ER efficiency e for PANI-1mLPPy and PANI-2mLPPy ER fluids at shear rate 0.1 s −1 is 36.6 and 28.5 under electric field strength E = 3 kV/mm, respectively. Low leaking current density is observed even at high electric field strength and wide plateau region appeared, which show a strong ER activity for the PANI/PPy composite nanofibers. The results also indicate that the PANI/PPy composite particles have distinctly enhanced ER effect compared with the pure PANI and PPy particles under electric stimuli. The significantly improved ER property of PANI/PPy-based ER fluid is ascribed to the enhanced interfacial polarization. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46289.
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高影响因子
POLYMER BULLETIN
·
2018
·Vol. 75
·期 11
·4881-4899
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IF 1.589
Zhang Mengmeng,Chang Liangliang,Zhao Yuanyuan,Yu Zehao
Montmorillonite/polypyrrole (MMT/PPy) nanocomposites were fabricated by in situ polymerization of pyrrole monomer in the presence of MMT. The structures of the nanocomposites were analyzed by X-ray diffraction, Fourier transform infrared spectra, thermogravimetric analysis and transmission electron spectroscopy. Then, the capability of MMT/PPy nanocomposites on the removal of Eosin Y from aqueous solution was systematically studied. The MMT/PPy nanocomposites showed high adsorption capacity toward Eosin Y and a maximum adsorption capacity of 112.9 mg/g at 35 °C was achieved. The adsorption kinetics demonstrated a rapid Eosin Y uptake by MMT/PPy and the experimental data were well fitted to the pseudo-second-order model. Both the Langmuir and Freundlich models were employed to describe the adsorption isotherms, and the results presented that the equilibrium data obeyed the Langmuir model. Thermodynamic parameters of Δ G ° and Δ H ° verified the spontaneous and endothermic nature of the Eosin Y adsorption onto MMT/PPy. Furthermore, the regeneration experiments revealed that MMT/PPy nanocomposites could be reused after treated with hydrochloric acid solution, showing potential applications in purification of dyeing effluents.
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高影响因子
Food Analytical Methods
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2018
·Vol. 11
·期 6
·1832-1839
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IF 2.245
Wang Mingwei,Zhang Hua,Jia Jun,Han Dandan,Han Yehong,Yan Hongyuan
A simple method for the isolation and determination of 6-benzyladenine (6-BA) in bean sprout based on graphene oxide/polypyrrole (GO/ppy) as the adsorbent of pipette-tip solid-phase extraction coupled with high-performance liquid chromatography was developed. GO/ppy composite was synthesized with graphene oxide and polypyrrole by in situ polymerization and characterized by scanning electron microscopy. The prepared GO/ppy has an ideal foamy appearance which not only maintained the lamellar structure of graphene but also showed less agglomeration. The parameter of mass ratio of GO/ppy in the preparation procedure and parameters of the extraction procedure including the amount of adsorbent and types and volumes of washing solvent and elution solvent were optimized to achieve optimal extraction efficiency. Good linearity of GO/ppy was achieved in the range of 44–2200 ng g −1 with correlation coefficient ( r ) of 0.9998. Recoveries between 92.5 and 103.7% were obtained at three spiked levels with RSDs ≤ 3.0%. The proposed method was successfully applied for the extraction and determination of 6-BA in bean sprout samples.
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高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Yuhong Bi,Amit Nautiyal,Huaiping Zhang,Hong Yan,Jujie Luo,Xinyu Zhang
MnO 2 nanowires/graphite nanocomposites (MnO 2 -NW@Graphite) were successfully manufactured by an ultrafast, facile and cost-effective solid-state approach using microwave energy. Intensive research was conducted to investigate the effects of the material mass ratio, the microwave power and the microwave exposure time on the yield and morphology of the MnO 2 -NW@Graphite nanocomposites. The effect of the heating layer on the morphology was also studied. The morphology and structure of the nanocomposites were characterized using scanning electron microscope (SEM), X-ray power diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and thermal gravimetric analysis (TGA). In addition, the electrochemical performances of the MnO 2 -NW@graphite nanocomposites were evaluated in basic media using 1 M potassium hydroxide (KOH). The prepared nanocomposites exhibit a maximum specific capacity of 380.4 F/g at a current density of 1 A/g. The composites show high rate capabilities and good long-term stability with approximately 80% (303.57 F/g) retention of capacitance after 2000 cycles. With the low mass percentage (12.9%) of MnO 2 nanowires in MnO 2 -NW@Graphite, its outstanding electrochemical performance shows that it is a promising electrode material for supercapacitors . In addition, this microwave assisted approach towards the fabrication of MnO 2 nanowires is expected to achieve mass production for inexpensive energy materials.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2017
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IF 5.401
Wanying Zhu,Xin Shen,Chunhong Zhu,Bingzhi Li,Junli Hong,Xuemin Zhou
In this work, based on purifying the analysis system by magnetic separation, we constructed a turn-on fluorescent assay for highly sensitive detection of possible biomarkers, employing adenosine as the model target analyte. Aptamer labeled-carbon dots (Apt-CDs) was applied as fluorescence probes as well as selective recognition elements, while Fe 3 O 4 @polypyrrole (Fe 3 O 4 @PPY) was used as fluorescence quenching and magnetic separating materials for system purification. In absence of adenosine, the Apt-CDs were attached to the surface of PPY through π-π stacking and hydrophobic interaction and its fluorescence was quenched by Fe 3 O 4 @PPY. In presence of adenosine, the aptamer could specifically bind with adenosine to form a three dimensional Apt-CDs-adenosine complex and detach from PPY, leading to the fluorescence recovery of Apt-CDs. More importantly, with analysis system purification via twice convenient magnetic separations of free CDs and Apt-CDs-adenosine complex respectively, the detection limit could be reduced from 8 nmol L −1 to 0.15 nmol L −1 . This concept offers potential application for simple, rapid, cost-effective, and highly sensitive assay of biological samples.
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RSC Advances
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2018
·Vol. 8
·期 14
·7330-7339
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IF 2.936
Yongjin Li,Liming Wang,Yong Gao,Weijun Yang,Yingying Li,Cancheng Guo
Novel conjugated metalloporphyrin polymers (PP-EPMn and PX-EPMn) were synthesized by the Sonogashira coupling reaction with Mn(III)5,10,15,20-tetraksi(4′-ethynylphenyl)porphyrin ([p-ethynyl]4PMn) as building block, and with phenylene and xenyl groups as bridges, respectively. Fine nanospheres were obtained through control of the reaction conditions. The two polymer nanospheres were characterized in detailed by BET, FE-SEM, HR-TEM, FT-IR, UV-Vis and XPS, revealing that they were highly ordered, highly developed microporous and super-conjugated metalloporphyrin polymers with large surface areas and uniform pore sizes. Their electrochemical behaviors and hydrophilicity were also investigated. With the synergistic effects of porous nanosphere structure and conjugated covalent structure, PP-EPMn and PX-EPMn showed excellent catalytic activity and reusability in the catalytic degradation of methylene blue (3,7-bis(dimethylamino)-5-phenothiazinium chloride) in aqueous solution. The good hydrophilicity of the polymer nanospheres promoted the catalytic degradation. In particular, unlike Fenton degradation systems that require acidic conditions, PP-EPMn degraded methylene blue significantly better under alkaline conditions, which implied a good prospect in treating industrial methylene blue dye wastewater.
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PubMed
高影响因子
JOURNAL OF POWER SOURCES
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2018
·
IF 6.945
Gaoming Wu,Han Bao,Zheng Xia,Bin Yang,Lecheng Lei,Zhongjian Li,Chunxian Liu
Anode materials , as the core component of microbial fuel cells (MFCs), have huge impacts on power generation performance and overall cost. Stainless-steel sponge (SS) can be a promising material for MFC anodes, due to its open continuous three-dimensional structure, high conductivity and low cost. However, poor biocompatibility limits its application. In this paper, a polypyrrole/sargassum activated carbon modified SS anode (Ppy/SAC/SS) is developed by electrochemical polymerization of pyrrole on the SS with the SAC as a dopant . The maximum power density achieved with the Ppy/SAC/SS anode is 45.2 W/m 3 , which is increased by 2 orders of magnitude and 2.9 times compared with an unmodified SS anode and a solely Ppy modified SS anode (Ppy/SS), respectively. In addition, the Ppy/SAC layer effectively eliminates electrochemical corrosion of the SS substrate. Electrochemical impedance spectroscopy reveals that Ppy/SAC modification decreases electron transfer resistance between the bacteria and the electrode. Furthermore, in vivo fluorescence imaging indicates that a more uniform biofilm is formed on the Ppy/SAC/SS compared to the unmodified SS and Ppy/SS. Due to the low cost of the materials, easy fabrication process and relatively high performance, our developed Ppy/SAC/SS can be a cost efficient anode material for MFCs in practical applications.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 53
·期 11
·8409-8419
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IF 2.993
Wang Yuedan,Zhang Yang,Zhong Weibing,Qing Xing,Zhou Quan,Liu Qiongzhen,Wang Wenwen,Liu Xue,Li Mufang,Wang Dong
Graphene oxide (GO)-induced porous coral-like polypyrrole have been fabricated via facile in situ polymerization. The morphologies and structures of PPy with different GO concentration were investigated by scanning electron microscopy and Fourier transform infrared spectroscopy. The results revealed that PPy/GO presented different morphologies and properties with varied amounts of GO. The electrochemical performances of prepared PPy/GO and PPy electrodes were compared. Notably, the PPy/GO electrodes showed much better electrochemical performance than the PPy electrodes. It indicated that the doping of GO in the composites significantly enhanced the electrochemical behaviors of PPy/GO electrodes. The excellent performance was the result of synergistic effects of GO and PPy structure and property. The device obtained a large specific capacitance of 568.35 F g −1 at a current density of 0.1 A/g and high energy density of 37.4 Wh kg −1 . In addition, it also exhibited good cycle stability, with a capacitance retention rate of 83.4% for 500 cycles. More importantly, the electrode presented high flexibility property. The supercapacitor device fabricated is promising for the use in lightweight and flexible electronic devices.
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高影响因子
ACS Applied Nano Materials
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2018
·
IF 0
Ya-Nan Sun,Zhu-Yin Sui,Xin Li,Pei-Wen Xiao,Zhi-Xiang Wei,Bao-Hang Han
A novel polypyrrole-based aerogel (PPA) with a three-dimensional structure is synthesized through a simple hydrothermal process of homogeneous dispersion consisting of pyrrole and a block copolymer, followed by freeze-drying. The block copolymer plays the role of dispersant, which can be ascribed to the hydrophilic–hydrophobic interaction between pyrrole-based units and the block copolymer. Compared with a conventional bulk polypyrrole powder, the PPA exhibits higher porous attributes, which provide favorable conditions to the subsequent activation procedure. A nitrogen-doped porous carbon (NPC) with high porosity is then prepared after a physical activation treatment of PPA using carbon dioxide as an activation agent. The structure and porous property of the NPC are characterized by scanning electron microscopy, transmission electron microscopy, infrared spectroscopy, X-ray photoelectron spectroscopy, and nitrogen adsorption–desorption experiments. The as-made NPC-950-100 possesses a large Brunauer–Emmett–Teller specific surface area (2330 m2 g–1), large pore volume (2.54 cm3 g–1), and nitrogen doping (4.1 wt %). These properties result in a high carbon dioxide uptake capacity of 20.5 wt % at 273 K and 1.0 bar. Furthermore, NPC-950-60 also displays a decent specific capacitance (156 F g–1 at 0.1 A g–1) and an excellent long-term cycling stability (∼100% capacitance retention at 5 A g–1 after 10000 cycles).
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Kun Liu,Yahui Li,Huayu Zhang,Yanchen Liu
Copper nanowires (Cu NWs) encapsulated with polypyrrole (PPy) (Cu@PPy) have been fabricated by a facile liquid-phase reduction with copper (II) chloride as precursor. The as-synthesized Cu NWs grow along the crystal orientation of (1 1 0) and the encapsulated polypyrrole layer is also observed on the surface of Cu NWs. The Cu@PPy nanostructure is investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR). And the experimental results show that the synthesized Cu@PPy are uniform and cross each other with the average width of 160 nm. Additionally, the results of XRD and XPS indicate the Cu@PPy nanostructure has excellent oxidation resistance and temporal stability.
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高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Sisi Yang,Zhenglin Li,Yuanlin Wang,Xuelei Fan,Zhaohua Miao,Ying Hu,Zhuo Li,Ye Sun,Flemming Besenbacher,Miao Yu
High-performance theranostic nanoagents, which integrate multimodal imaging and photothermal therapy for clinical anticancer treatment, are highly desired. Herein, we report the synthesis and bioapplication of a multifunctional theranostic nanoagent based on polyethylene glycol (PEG)-modified polypyrrole (PPy)-coated bismuth (Bi) nanohybrids (referred to as Bi@PPy-PEG NHs) for X-ray computed tomography/photoacoustic (CT/PA) dual-modal imaging and photothermal therapy (PTT). The obtained Bi@PPy-PEG NHs have a distinct core–shell structure with the metallic Bi nanoparticle as the inner core and the PPy-PEG layer as the shell. The Bi@PPy-PEG NHs show excellent physiological stability and compatibility, without noticeable cytotoxicity. Importantly, the NHs exhibit strong NIR absorbance and remarkable photothermal conversion capability and conversion stability, with the photothermal conversion efficiency as high as ∼46.3%. Thanks to the strong PTT effect, highly effective photothermal ablation on cancer cells has been achieved both in vitro and in vivo. Furthermore, a high-contrast in vitro and in vivo CT/PA dual-modal imaging has been realized, showing great potential to provide comprehensive diagnosis information for antitumor treatment. In particular, the CT enhancement efficiency of the NHs is of ∼14.4 HU mM–1, which is ∼3.7-fold that of clinically used iohexol. Therefore, our work highlights the potential of using such core–shell Bi@PPy-PEG NHs as a versatile theranostic nanoplatform for cancer imaging and therapy.
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PubMed
高影响因子
CARBON
·
2018
·
IF 7.082
Ye Yuan,Weilong Yin,Minglong Yang,Fan Xu,Xu Zhao,Jianjun Li,Qingyu Peng,Xiaodong He,Shanyi Du,Yibin Li
With the noticeable growing rate of electronics, materials with good flexibility and high conductivity that can provide electromagnetic interference (EMI) shielding with minimal thickness are urgently needed. Here, for the first time, we demonstrate the potential of a non-woven composite film with unique core-shell and sandwich combined microstructure for EMI shielding. A 0.27-mm-thick reduced graphene oxide coated Fe 3 O 4 @SiO 2 @polypyrrole (FSPG) composite film exhibited an average EMI shielding effectiveness of 32 dB (specific EMI shielding effectiveness can be ∼ 12,608.4 dB cm 2 g −1 ). This performance originates from the relative high electrical conductivity of FSPG films (0.71 S/cm) and multiple internal reflections from the interconnected core-shell and sandwich microstructure in the free-standing films. The mechanical flexibility offered by the FSPG films enable them to be considered as a new alternative material with efficient EMI shielding.
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危险品化学品经营许可证（带存储）