RSC Advances
·
2016
·Vol. 6
·期 87
·84269-84275
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IF 3.289
Ming Liu,Na Xu,Wensen Liu,Zhigang Xie
Core–shell PLGA@Polypyrrole nanoparticles (PLGA@PPy NPs) were prepared by polymerization of pyrrole on the surface of PLGA nanoparticles (PLGA NPs). Curcumin (Cur) as a chemotherapeutic agent was encapsulated into PLGA NPs, and used to synthesize the PLGA (Cur)@PPy NPs. Uniform structure and sustained release of Cur has been demonstrated. PLGA@PPy NPs still retain the ability of a photothermal effect upon laser irradiation. This PLGA@PPy NPs could be internalized by cancer cells by endocytosis, and indicate the potent cytotoxicity. Combining the photothermal therapy, the Cur loading PLGA@PPy NPs show enhanced cytotoxicity compared to single chemotherapy or photothermal therapy. This core–shell PLGA@PPy system could be potentially used as a universal drug delivery platform for combination therapy.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2017
·
IF 3.012
Changling Yan,Ruixing Zhang,Yujuan Chen,Gongke Wang
A novel molecularly imprinted polymer (MIP), poly(pyrrole- co - o -phenylenediamine) (p(Py- co -OPD)), has been developed in order to construct an enrofloxacin (EF) sensor by using cyclic voltammetry (CV) technique. The preparation conditions including the pH level, EF concentration, the number of CV cycles, extraction solution of the template and the incubation time were optimized. The performance of the MIP sensor was evaluated by square wave voltammetry (SWV). Under the optimal experimental conditions, the MIP sensor exhibited long time stability, good selectivity and a wide linear range of 1.0 × 10 − 4 –1.0 × 10 − 10 mol/L with a low detection limit of 6.57 × 10 − 13 mol/L towards EF. Moreover, the sensor was successfully used to determine the EF amount in the pharmaceutical samples with satisfactory results.
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Shihui Qiu,Wei Li,Wenru Zheng,Haichao Zhao,Liping Wang
Dispersion of graphene in water and its incorporation into waterborne resin have been rarely researched and hardly achieved owing to its hydrophobicity. Furthermore, it has largely been reported that graphene with impermeability contributed to the improved anticorrosion property. Here, we show that highly concentrated graphene aqueous solution up to 5 mg/mL can be obtained by synthesizing hydrophilic polypyrrole (PPy) nanocolloids as intercalators and ultrasonic vibration. On the basis of π–π interaction between PPy and graphene, stacked graphene sheets are exfoliated to the thickness of three to five layers without increasing defects. The corrosion performance of coatings without and with PPy and graphene is obtained by potential and impedance measurements, Tafel curves, and fitted pore resistance by immersing in a 3.5 wt % NaCl solution. It turns out that composite coating with 0.5 wt % graphene additive exhibits superior anticorrosive ability. The mechanism of intercalated graphene-based coating is interpreted as the synergistic protection of impermeable graphene sheets and self-healing PPy and proved by the identification of corrosion products and the scanning vibrating electrode technique.
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PubMed
高影响因子
CELLULOSE
·
2017
·Vol. 24
·期 11
·5187-5196
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IF 3.417
Wei Chengzhuo,Fan Lingling,Rao Weida,Bai Zikui,Xu Weilin,Bao Haifeng,Xu Jie
Paper with color changes caused by applied electric voltages was fabricated by combining the electric heating feature of conductive polypyrrole (PPy) and the temperature response color-changing feature of thermochromic ink. Highly conductive PPy was deposited selectively on the graphite-coated side of the paper via electrochemical polymerization. Thermochromic ink was coated on the reverse side with white color. The conductive coatings were tightly covered on the paper due to the hydrogen bonding between the pyrrole rings and the hydroxyl groups of cellulose. The obtained paper could be heated to about 45 °C and change its color significantly under an applied voltage of 4 V.
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RSC Advances
·
2016
·Vol. 6
·期 99
·96455-96466
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IF 3.289
Aibing Chen,Pengpeng Ju,Yunzhao Zhang,Jinzhu Chen,Hui Gao,Limin Chen,Yifeng Yu
A new core-double-shell microsphere [Fe3O4@SiO2@Zn(Por)OP] was designed and prepared by coating a core–shell composite of Fe3O4 magnetic core and SiO2 shell (Fe3O4@SiO2) with a zinc porphyrin-based organic polymer [Zn(Por)OP]. While, Zn(Por)OP was readily obtained by a convenient condensation of pyrrole and terephthaldehyde in propanoic acid followed by a direct metallation with zinc acetate. Due to the presence of the inner core–shell particles (Fe3O4@SiO2), the cage construction of this composite microsphere Fe3O4@SiO2@Zn(Por)OP was significantly different from that of solid polymeric microsphere Zn(Por)OP, which further infected its physical properties to achieve a controllable morphology regulation easily. Besides, removing the inner core–shell particles of Fe3O4@SiO2 from Fe3O4@SiO2@Zn(Por)OP led to the formation of the Zn(Por)OP hollow microspheres which exhibited outstanding catalytic performance for the cycloaddition of carbon dioxide and propylene oxide to give propylene carbonate (PC) with turnover frequency (TOF) of 13 978 molPC molZn−1 h−1. For the Fe3O4@SiO2@Zn(Por)OP composite, the outer organic shell Zn(Por)OP served as the catalytically active layer for the cycloaddition and a PC yield of 97% was obtained. More importantly, the catalyst could be easily recycled from the reaction mixture by magnetic separation and no significant loss of the activity was observed after sixteen cycles. Therefore, this composite microsphere can provide insightful information for further design of magnetic materials with controllable morphology regulation as well as can be extended toward the development of highly efficient, stable and recyclable catalysts in other catalytic reaction systems.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 28
·期 2
·1777-1784
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IF 1.798
Chang Chengshuai,Yang Xuena,Xiang Shisen,Que Haoan,Li Mei
Using polypyrrole (PPy) nanotubes as the substrate, the layered molybdenum disulfide (MoS 2 ) nanosheets were wrapped on PPy nanotubes to form MoS 2 /PPy nanocomposites by a hydrothermal reaction. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images showed that MoS 2 nanosheets coated uniformly on the surface of PPy nanotubes owing to the electrostatic force. The specific capacitance of the MoS 2 /PPy nanocomposites was high up to 307.5 F g −1 , much higher than that of the pure PPy with specific capacitance of 106.3 F g −1 and MoS 2 with specific capacitance of 138.5 F g −1 at a current density of 1.0 A g −1 in 1 M KCl electrolyte. And the special structure of MoS 2 /PPy nanocomposites electrode reduces the deformation during the charge–discharge process and thus improves the rate stability and electrochemical cycling stability of the electrode significantly. The specific capacitance retains 96.47 % after 1000 charge–discharge processes which provides potential as supercapacitors.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2016
·
IF 2.822
Changling Yan,Xun Liu,Ruixing Zhang,Yujuan Chen,Gongke Wang
In this work, a novel approach for selective and sensitive detection of ascorbic acid (AA) was proposed combined molecularly imprinted polymers and electrochemical sensor. The molecularly imprinted sensor was prepared by cyclic voltammetry on pencil graphite electrode with pyrrole (Py) and o-phenylenediamine (o-PD) as functional monomers and AA as template molecule. The sensor was evaluated through scanning electron microscope (SEM) and square wave voltammetry (SWV). The factors affecting electrochemical response of sensor were investigated and optimized. Under the optimum conditions, the imprinted sensor exhibited good selectivity and stability. The linear range of the sensor was 1 × 10 − 6 to 1 × 10 − 3 mol/L, meanwhile, the detection limit was 2.63 × 10 − 7 mol/L (S/N = 3). This molecularly imprinted sensor has been successfully used in AA determination in real tablet samples with good recovery.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Wenbei Zhang,Tianlu Cui,Lingyun Yang,Chao Zhang,Ming Cai,Sai Sun,Yefeng Yao,Xiaodong Zhuang,Fan Zhang
Iron and nitrogen (Fe/N) co-doped porous carbons have already shown great potential as electrocatalysts for oxygen reduction reaction in alkaline media. However, it still remains a great challenge to finely integrate a hierarchical porous structure and Fe/N co-doping effect into one material at the same time. In this work, a rational design toward Fe/N-codoped hierarchical porous carbon spheres was developed by the formation of an iron-porphyrin-containing conjugated microporous polymer sphere with hollow structure (HCMP) through a silica sphere template directed condensation of pyrrole and 1,4-phthalaldehyde, then etched with NaOH, and treated with FeCl 2 . The resulting HCMP-Fe polymer was readily converted to a series of Fe/N co-doped hierarchical porous carbons (HPC-Fe/N-X, X = 700–900) upon pyrolysis at different temperatures and etching treatment. These porous carbons exhibit the high specific surface areas up to 518 m 2 g −1 and the contents of N and Fe up to 3.28 at.% and 0.85 wt.%, respectively. Benefiting from the high surface area, Fe/N co-doping character, HPC-Fe/N-700 exhibited excellent electrochemical catalytic performance for oxygen reduction reaction under alkaline condition (0.1 M KOH) with a low half-wave potential (0.84 V), a dominant four-electron transfer mechanism (n = 3.89 at 0.65 V), as well as a high diffusion limiting current density ( J L = 5.19 mA cm −2 ), comparable to those porous carbon-based ORR catalysts with excellent electrochemical performance.
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PubMed
高影响因子
MATERIALS & DESIGN
·
2017
·
IF 4.364
Shun Tang,Qian Lan,Jiyuan Liang,Shengrui Chen,Chang Liu,Jinxing Zhao,Qi Cheng,Yuan-Cheng Cao,Jiyan Liu
We report a facile method to synthesize polypyrrole-coated Fe 3 O 4 core-shell magnetic nanoparticles (Fe 3 O 4 @PPy). First, crude Fe 3 O 4 nanoparticles were synthesized by co-precipitation approach. PPy layers were generated and deposited on the surface of Fe 3 O 4 via in-situ electropolymerization and electrodeposition , to construct core-shell structure nanoparticles. TEM observations showed the Fe 3 O 4 nanoparticles changed from 15 nm to 120 nm in diameter after the PPy coating. The composition and morphology of Fe 3 O 4 @PPy nanoparticles were characterized by advanced spectroscopic and imaging techniques. The Fe 3 O 4 @PPy nanoparticles possess good dispersion property and acid stability in strong acid aqueous. The magnetic measurement at room temperature indicates that the Fe 3 O 4 @PPy nanoparticles exhibit superparamagnetic behavior, holding the saturation magnetization of 43.5 emu/g. All the results show great potentials of the Fe 3 O 4 @PPy nanoparticles in wide range of applications.
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ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Yaju Chen,Rongchang Luo,Qihang Xu,Jun Jiang,Xiantai Zhou,Hongbing Ji
Multifunctionalization of organic polymers for acting synergistically on substrate is of wide interest in the field of modern catalysis, but it is still a significant challenge. Herein, two novel bifunctional polymers were first designed and synthesized by combining ionic liquids (ILs) with zinc(II) porphyrin through simple and reversible Schiff base reactions. The fabricated polymers with flexible structures and nitrogen-rich environments presented high affinity toward CO2 molecules at ambient conditions. Owing to the cooperative nature of intercalated ILs and Lewis acidic metal sites, these materials could serve as efficient heterogeneous catalysts for the insertion of CO2 into epoxides to produce cyclic carbonates. As expected, these polymers exhibited good catalytic performance, robust constancy, excellent recyclability, and good substrate expansibility for this reaction in the absence of cocatalyst under mild or even ambient conditions. Notably, the selected catalyst SYSU-Zn@IL2 could directly convert diluted CO2 (15% CO2 in N2) into cyclic carbonate at 80 °C and 3.0 MPa, further offering the great application potential for recycling real-world carbon resource.
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Advanced Materials Technologies
·
2017
·Vol. 3
·期 1
·1700206
·
IF 0
Li Liu,Qiang Lu,Shuanglei Yang,Jiang Guo,Qingyong Tian,Weijing Yao,Zhanhu Guo,Vellaisamy A. L. Roy,Wei Wu
The next-generation energy storage devices are expected to be flexible, cost-effective, and high power storage devices to complement or replace rigid batteries and conventional capacitors for wearable electronic device applications. In this regard, a scalable and cost-effective fabrication of all-printed solid-state microsupercapacitors (MSCs) involving self-template synthesis of Ag@PPy nanocomposites (NCs) as active materials is demonstrated. The as-obtained Ag@PPy NCs exhibit high specific capacitance and are formulated as screen printing inks that are printed to form electrodes on plastic substrates. The Ag current collectors, Ag@PPy NC electrodes, and gel electrolyte are screen printed and fabricated as flexible all-solid-state MSCs exhibiting excellent capacitive features, including remarkable mechanical flexibility of 77.6% after 1000 bending cycles, superior stability of 82.6% after 10000 cycles, and high energy density of 0.00433 mW h cm −2 . The Ag@PPy inks are easily prepared and more than 40 printed MSCs are fabricated on flexible plastic substrates in less than 30 min. It is envisioned that the fully printed flexible all-solid-state MSCs could be a promising candidate for flexible energy storage devices.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Wei Fang,Naiqing Zhang,Lishuang Fan,Kening Sun
Polypyrrole-coated Bi 2 O 3 @CMK-3 nanocomposite is prepared by nanocasting technique and chemical polymerization method. Bi 2 O 3 nanoparticles are dispersed into CMK-3 matrix, and polypyrrole is coated onto the surface of Bi 2 O 3 @CMK-3. Polypyrrole-coated Bi 2 O 3 @CMK-3 nanocomposite as an anode material for lithium-ion batteries has an outstanding power capability (321 mAh g −1 at a current rate of 6 A g −1 ) and a significantly improved cycling ability (380 mAh g −1 after 1000 cycles at a current rate of 5 A g −1 ). The greatly enhanced electrochemical performance of polypyrrole-coated Bi 2 O 3 @CMK-3 nanocomposite is associated with the synergistic effect of highly conductive CMK-3, polypyrrole layer and Bi 2 O 3 nanoparticles. Such a configuration inhibits the aggregation of Bi 2 O 3 nanoparticles and preserves the structure integrity of electrode material, in addition to highly improving the electrical conductivity and maintaining the stable structure of solid electrolyte interface film.
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