SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Bingzhi Li,Yue Chen,Jing Wang,Qiaoyun Lu,Wanying Zhu,Lei Xu,Xin Shen,Jieping Luo,Chunhong Zhu,Xiaoxu Li,Junli Hong,Xuemin Zhou
Transcription factors (TFs) regulate information flow from gene to protein, and they are recognized as key indicators to reflect cellular processes. Facile monitoring of TFs may aid diagnostics and treatment, but we still lack of techniques for highly efficient detection of them. In this research, a hybrid material consisting of DNA-silver nanoclusters (DNA-AgNCs) and polypyrrole nanoparticles (PPyNPs) was built for TFs detection. The designed DNA-AgNCs have a hairpin-shaped nucleic acid architecture with a double-stranded stem for recognizing TFs and a single-stranded loop for interacting with PPyNPs. In the absence of TFs, DNA-AgNCs are absorbed to PPyNPs, resulting in fluorescent quenching. While in the presence of TFs, the binding between TFs and the DNA-AgNCs caused desorption of DNA-AgNCs via steric hindrance mechanism. Accordingly, the increase of fluorescence derived from desorption is used for quantifications. Derived from low non-specific protein absorption features of PPyNPs, detection limit of 70 pM for NF-κB p50 and 110 pM for p53 were obtained. Then, by absorbing two kinds of DNA-AgNCs to PPyNPs, label-free multiplexed detection of TFs was first realized. Additionally, we suggested that this platform can be developed for drug screening by evaluating inhibitory effect of a pair of optical isomers towards TFs.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Zhipeng Liao,Xiaofeng Fang,Jiansheng Li,Xin Li,Wuxiang Zhang,Xiuyun Sun,Jinyou Shen,Weiqing Han,Shuaifei Zhao,Lianjun Wang
To enhance the antibacterial property and chlorine resistance, organic nanospheres, polypyrrole (PPy), were innovatively incorporated into the polyamide (PA) layer for fabricating thin film nanocomposite (TFN) membranes. Owing to the improved hydrophilicity and compatibility between the PPy nanospheres and the PA layer, the obtained TFN membranes exhibited significant water flux enhancement without sacrificing salt rejection. Under the optimal PPy dosage (0.006 wt%), TFN membranes showed a high water flux of 42.19 L/(m 2 h), which was 118.0% higher than that of the pristine membrane. Remarkably, the chlorine resistance of TFN membranes was strengthened after the incorporation of PPy nanospheres, as evidenced by the less decreased salt rejection, as compared with the TFC and commercial RO membrane. In addition, the positively charged PPy nanospheres immobilized in the PA layer endow the TFN membranes with improved biocidal activity, which was much higher than that of the pristine membrane. This study shows that incorporating organic nanospheres into the PA layer is an effective strategy to develop new TFN membranes with enhanced performance for advanced water purification.
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高影响因子
CORROSION SCIENCE
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2018
·
IF 4.862
Zhenzhen Jin,Yubing Qiu,Zhenyu Chen,Xingpeng Guo
The effect of doping anions on the degradation of electrochemical activity of polypyrrole (PPy)/A (A: SO 4 2− , pTS − , PSS − , and GO) films in NaOH is investigated by various electrochemical methods and microscopic analyses. The degradation rates of PPy/A films follow first-order k inetics. The PPy/SO 4 and PPy/GO films have two degradation stages with higher rate constants ( k ), while the PPy/pTS and PPy/PSS films just show one degradation stage with much lower k values. The exchange ability of doping anions with OH − and the penetration of OH − into the inner film are two crucial factors for the degradation of PPy in NaOH.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
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2018
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IF 3.525
Hongju Han,Min Fu,Yalin Li,Wei Guan,Peng Lu,Xueli Hu
Polypyrrole-modified graphitic carbon nitride composites (PPy/g-C 3 N 4 ) are fabricated using an in-situ polymerization method to improve the visible light photocatalytic activity of g-C 3 N 4 . The PPy/g-C 3 N 4 is applied to the photocatalytic degradation of methylene blue (MB) under visible light irradiation. Various characterization techniques are employed to investigate the relationship between the structural properties and photoactivities of the as-prepared composites. Results show that the specific surface area of the PPy/g-C 3 N 4 composites increases upon assembly of the amorphous PPy nanoparticles on the g-C 3 N 4 surface. Owing to the strong conductivity, the PPy can be used as a transition channel for electrons to move onto the g-C 3 N 4 surface, thus inhibiting the recombination of photogenerated carriers of g-C 3 N 4 and improving the photocatalytic performance. The elevated light adsorption of PPy/g-C 3 N 4 composites is attributed to the strong absorption coefficient of PPy. The composite containing 0.75 wt% PPy exhibits a photocatalytic efficiency that is 3 times higher than that of g-C 3 N 4 in 2 h. Moreover, the degradation kinetics follow a pseudo-first-order model. A detailed photocatalytic mechanism is proposed with · OH and · O 2 − radicals as the main reactive species. The present work provides new insights into the mechanistic understanding of PPy in PPy/g-C 3 N 4 composites for environmental applications.
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高影响因子
Journal of Materials Chemistry C
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2018
·Vol. 6
·期 24
·6416-6422
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IF 5.976
Taoping Wang,Mingtong Li,Hui Zhang,Yunyu Sun,Bin Dong
Smart actuators have recently been widely studied due to their potential applications in the fields of wearable devices, artificial muscles and microrobots. However, it is still challenging to develop smart actuators with a fast response time, large deformation, multi-stimuli response ability and programmable shape-changing capability. Here, we report a novel smart actuator, which consists of polypyrrole and agar. Due to the water absorbing ability, the photothermal effect and the protonation behavior originating from polypyrrole and agar, the resulting actuator is responsive to a variety of stimuli, including humidity, light, temperature, HCl and NH3 gas. In addition, the actuator exhibits fast responsiveness, controllable actuation and large bending. Interestingly, two external stimuli can be combined to activate the actuator, leading to continuous shape changes in a programmable fashion. Multi-stimuli responsive actuators have opened up great opportunities in a variety of applications. As a proof-of-concept, we have demonstrated their application as a walking device with cargo transportation and delivery capabilities.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2018
·Vol. 165
·期 7
·A1515
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IF 3.662
Qifan Liu,Limin Zang,Chao Yang,Chun Wei,Jianhui Qiu,Chanjuan Liu,Xu Xu
A flexible and knittable symmetric all-solid-state fiber supercapacitor (ASSFS) was fabricated by using two polypyrrole (PPy) microcone arrays coated stainless steel yarns (SSY) as fiber electrodes and current collectors. The microcone arrays and interconnected network structure of PPy could increase transport path for ions/electrons and enlarge the real contact area between PPy and electrolyte, leading to superior specific capacitance. In addition, the fiber electrode has a high tensile strength of ∼1200 MPa and elongation at break is 12.5%. The outstanding mechanical performance of the fiber electrode is attributed to the high mechanical properties of the SSY and the protection of PPy coating. The resultant ASSFS exhibits maximum specific capacitance of 42.7 F/cm3, energy density of 3.8 mWh/cm3 and power density of 388 mW/cm3 (normalized to the whole device). The specific capacitance maintains 100% at different bending angles and 93.5% of its initial value after 1000 bending cycles. As a demonstration, a fabric and a bracelet knitted with five ASSFSs connected in series can light a LED.
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高影响因子
Food Analytical Methods
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2018
·Vol. 11
·期 10
·2885-2896
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IF 2.245
Qi Mengyu,Tu Chunyan,Li Zhaoqian,Wang Weiping,Chen Jianrong,Wang Ai-Jun
A rapid, sensitive, and economical pipette tip solid phase extraction (PT-SPE) based on graphene oxide/polypyrrole (GO/PPy) coupled with high performance liquid chromatography (HPLC) was developed for the extraction and determination of sulfonamides (SAs) in honey and milk samples. The PT-SPE procedure involved only 3.0 mg of adsorbent, 3 min adsorptive extraction time, and less than 1.0 mL of solvent consumption (sample, washing, or eluent). Under the optimal conditions, good linearities (0.01–10.00 μg mL −1 ) were obtained with correlation coefficients ( r ) > 0.9996. The limits of detection ( S / N = 3) were in the range of 1.04–1.50 ng mL −1 . Meanwhile, the proposed method was successfully applied for the analysis of SAs in honey and milk with average recoveries within 62.3–109.0% and relative standard deviations less than 11.2%. The results demonstrated that the developed PT-SPE-HPLC method was suitable for the analysis of SAs in complex matrix due to its high sensitivity and accuracy.
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高影响因子
ACS Applied Materials & Interfaces
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2018
·
IF 8.097
Chao Zhang,Jun Liu,Yixing Ye,Zabeada Aslam,Rik Brydson,Changhao Liang
Transition metal/nitrogen/carbon (M-N/C) catalysts are considered as one of the most promising candidates to replace Pt/C catalysts for oxygen reduction reactions (ORRs). Here, we have designed novel reduced graphene oxide (rGO)-supported Fe–N-doped carbon (Fe–N–C/rGO) catalysts via simple pyrolysis of polypyrrole (Ppy)–FeO–GO composites. The as-prepared catalysts induced an onset potential of 0.94 V and a half-wave potential of 0.81 V in alkaline solutions, which is much better than those of the counterpart N–C and N–C/rGO catalysts and comparable to that of Pt/C catalysts. Moreover, the Fe–N–C/rGO catalysts showed improved durability and higher tolerance against methanol crossover than Pt/C in alkaline solutions. This superior ORR performance can be ascribed to the combined catalytic effect of both Fe-based nanoparticles (Fe3O4, Fe4C) and Fe–Nx sites, as well as fast mass transfer and accessible active sites benefiting from the mesoporous structure and high specific surface area. This work provides new insight for synthesis of a more promising nonplatinum electrocatalyst for metal–air batteries and fuel-cell applications.
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PubMed
高影响因子
POLYMER
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2018
·
IF 3.483
Haipeng Li,Yaqiong Wei,Jun Ren,Wulin Zhang,Chengwei Zhang,Yongguang Zhang
A novel three-dimensionally (3D) ordered hierarchically porous polypyrrole (3DOHPPy) is successfully synthesized via a simple chemical polymerization method by using silica colloidal crystals as templates. The 3DOHPPy possesses a large BET specific surface area (118.5 m 2 g −1 ), 3D ordered interconnected macropores (240 nm) and mesopores (2–3 nm) on the macropore walls. The sulfur/3DOHPPy (S/3DOHPPy) composite is prepared by a solution-diffusion route followed by low-temperature heat treatment and studied as a cathode material for the lithium/sulfur (Li/S) battery. The resulting S/3DOHPPy cathode shows a high specific discharge capacity of 751 mAh g −1 even after 100 cycles at 0.1 C and great rate capability. The superior electrochemical property of the S/3DOHPPy composite is ascribed to the unique hierarchical structure of 3DOHPPy with ordered interconnected macropores that benefit enhanced mass transfer and the small mesopores on the macropore walls that can immobilize the sulfur and polysulfides produced during the discharge/charge processes.
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高影响因子
APPLIED SURFACE SCIENCE
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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
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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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高影响因子
危险品化学品经营许可证（带存储）