Nanomaterials
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2019
·Vol. 9
·期 3
·455
·
IF 4.034
Yuhao Zhao,Kai Xia,Zhenzong Zhang,Ziming Zhu,Yongfu Guo,Zan Qu
In order to avoid using toxic or harmful operational conditions, shorten synthesis time, enhance adsorption capacity, and reduce operational cost, a novel magnetic nano-adsorbent of CoFe2O4@SiO2with core–shell structure was successfully functionalized with polypyrrole (Ppy). The physical and chemical properties of CoFe2O4@SiO2-Ppy are examined by various means. The as-prepared CoFe2O4@SiO2-Ppy nanomaterial was used to adsorb Hg2+from water. During the process, some key effect factors were studied. The adsorption process of Hg2+onto CoFe2O4@SiO2-Ppy was consistent with the pseudo-second-order kinetic and Langmuir models. The Langmuir capacity reached 680.2 mg/g, exceeding those of many adsorbents. The as-prepared material had excellent regeneration ability, dispersibility, and stability. The fitting of kinetics, isotherms, and thermodynamics indicated the removal was endothermic and spontaneous, and involved some chemical reactions. The application evaluation of electroplating wastewater also shows that CoFe2O4@SiO2-Ppy is an excellent adsorbent for Hg2+ions from water.Keywords:adsorbent;polypyrrole;heavy metal;mercury;modification
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Journal of Materials Chemistry A
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2019
·Vol. 7
·期 16
·9673-9679
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IF 10.733
Peng Mu,Wei Bai,Yukang Fan,Zheng Zhang,Hanxue Sun,Zhaoqi Zhu,Weidong Liang,An Li
Solar steam generation by heat localization has attracted much attention for its potential in the treatment of wastewater and seawater desalination. However, the preparation of a single-component solar receiver with low cost, simple preparation process, high mechanical strength and energy conversion efficiency is still a challenge. Herein, we report the preparation of kapok fiber-PPy aerogels with superwetting, porous structure, high light absorption, and high mechanical strength via polypyrrole modification of the Ca2+ crosslinked kapok fiber aerogels. The kapok fiber-PPy aerogels show three-dimensional structure with high porosity (94%), excellent light absorption (ca. 97%), low thermal conductivity (0.0241 W m−1 k−1) and high mechanical strength (0.12 MPa under 75% of strain). As a solar steam generation device, a high energy conversion efficiency of 82.4% was achieved under 1 kW m−2 illumination. The findings of this investigation may open a simple and novel route towards the fabrication of a low-cost a single-component biomass-based solar receivers for solar steam generation.
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CARBOHYDRATE POLYMERS
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2019
·
IF 6.044
Ting Zhao,Shiwei Qin,linna Peng,Pan Li,Tao Feng,Jingyuan Wan,Pei Yuan,Liangke Zhang
This study has developed a versatile nano-system with the combined advantages of photothermal effect, active tumor-targeting, temperature-sensitive drug release, and photoacoustic imaging. The nano-system consists of the core of the phase change material (PCM), the outer polypyrrole (PPY) shell and the hyaluronic acid (HA) modified in the PPY shell. The obtained composite nanoparticles (denoted as DTX/PPN@PPY@HA) were spherical with a mean diameter of about 232.7 nm. In vivo and in vitro photoacoustic imaging experiments show that DTX/PPN@PPY@HA is an effective photoacoustic contrast agent, which can be used for accurate localization of tumor region and real-time guidance of photothermal chemotherapy. DTX/PPN@PPY@HA shows good photothermal effects and temperature-sensitive drug release. In addition, cellular experiments showed that DTX/PPN@PPY@HA could be efficiently internalized into tumor cells and produce significant cytotoxicity with the help of near-infrared (NIR) laser. Furthermore, the remarkable inhibition of DTX/PPN@PPY@HA against tumor growth was achieved in 4T1 tumor-bearing mice model.
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Nano Research
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2019
·Vol. 12
·期 5
·1129-1137
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IF 8.515
Wang Lingchang,Zhang Chenguang,Jiao Xin,Yuan Zhihao
In the development of wearable energy devices, polypyrrole (PPy) is considered as a promising electrode material owing to its high capacitance and good mechanical flexibility. Herein, we report a PPy-based hybrid structure consisting of vertical PPy nanotube arrays and carbon nano-onions (CNOs) grown on textile for wearable supercapacitors. In this hybrid nanostructure, the vertical PPy nanotubes provide straight and superhighways for electron and ion transport, boosting the energy storage; while the CNOs mainly act as a conductivity retainer for the underlayered PPy film during stretching. A facile template-degrading method is developed for the large-area growth of the PPy-based hybrid nanostructures on the textile through one-step polymerization process. The fabricated stretchable supercapacitor exhibits superior energy storage capacitance with the specific capacitance of 64 F·g −1 . Also, it presents the high capacitance retention of 99% at a strain of 50% after 500 stretching cycles. Furthermore, we demonstrate that the textile-based stretchable supercapacitor device can provide a stable energy storage performance in different wearable situations for practical applications. The use of the PPy-based hybrid nanostructures as the supercapacitor electrode offers a novel structure design and a promising opportunity for wearable power supply in real applications.
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ACS Biomaterials Science & Engineering
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2019
·
IF 4.511
Zhengnan Zhou,Peng Yu,Lei Zhou,Lingjie Tu,Lei Fan,Fengmiao Zhang,Cong Dai,Yi Liu,Chengyun Ning,Jianqiang Du,Guoxin Tan
Imitating the physiological microenvironment of living cell and tissues opens new avenues of research into the application of electricity to medical therapies. In this study, dynamic piezoelectric stimulation is generated in a dynamic culture because of the piezoelectric effect of the poly(vinylidene fluoride)–polypyrrole (PVDF–PPy) electroactive composite. Combined with PPy nanocones, dynamic piezoelectric signals are effectively and continuously provided to cells. In the presence of dynamic piezoelectric stimulation and PPy nanocones, PPy-PVDF NS samples show promoted bone mesenchymal stem cell (BMSCs) adhesion, spreadin, and osteogenic differentiation. On the basis of the results of this study, PPy nanocones and dynamic piezoelectric stimulation can be administered to modulate cell behavior, paving the way for the exploration of cellular responses to dynamic electrical stimulation.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 16
·15130-15138
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IF 2.195
Liu Wanying,Zhu Yabo,Wang Shasha,Ban Xiaokuan,Xu Xiang,Zhang Xinxi
The composite of polypyrrole and black phosphorus (PPy/BP) has been successfully prepared by the in situ chemical method through the polymerization of pyrrole (Py) on the surface of BP flake. Characterization results show that it present well-dispersed morphological and P–C bonding in PPy/BP. It is evident that the adding of BP exactly brings the changes in morphological and structure. To verify the existence of BP and to obtain the structure relationship between BP and PPy, an auxiliary experiment has been designed and the corresponding XRD and TEM results clearly display that BP is wrapped by PPy. All these morphology and structural characteristics are conductive to the excellent electrochemical performance of PPy/BP. The electrochemical results show that, the capacity of PPy/BP is 515 F/g at 1 A/g, which is ~ 1.7 times (70%) higher than that of PPy and ~ 7.1 times than that of BP. The capacity of PPy/BP reaches stable value within 200 circles, which is faster than that of PPy within 450 circles. The stable value of PPy/BP is still ~ 1.5 times (48%) higher than that of PPy within 1000 circles, presenting better cycling performance.
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ACS Nano
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2019
·
IF 13.903
Bassam Saif,Wenxin Zhang,Xu Zhang,Quan Gu,Peng Yang
The discovery of a general strategy for organizing functional proteins into stable nanostructures with the desired dimension, shape, and function is an important focus in developing protein-based self-assembled materials, but the scalable synthesis of such materials and transfer to other substrates remain great challenges. We herein tackle this issue by creating a two-dimensional metal–protein hybrid nanofilm that is flexible and cost-effective with reliable self-recovery, stability, and multifunctionality. As it differs from traditional metal ions, we discover the capability of Sn2+ to initiate fast amyloid-like protein assembly (occurring in seconds) by effectively reducing the disulfide bonds of native globular proteins. The Sn2+-initiated lysozyme aggregation at the air/water interface leads to droplet flattening, a result never before reported in a protein system, which finally affords a multifunctional 2D Sn-doped hybrid lysozyme nanofilm with an ultralarge area (e.g., 0.2 m2) within a few minutes. The hybrid film is distinctive in its ease of coating on versatile material surfaces with endurable chemical and mechanical stability, optical transparency, and diverse end uses in antimicrobial and photo-/electrocatalytic scaffolds. Our approach provides not only insights into the effect of tin ions on macroscopic self-assembly of proteins but also a controllable and scalable synthesis of a potential biomimic framework for biomedical and biocatalytic applications.
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RSC Advances
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2019
·Vol. 9
·期 33
·18874-18887
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IF 3.049
Wei Cao,Xuandong Wang,Liang Song,Peiyuan Wang,Xuemei Hou,Huicong Zhang,Xiangdong Tian,Xiaolong Liu,Yun Zhang
Integrating multimodal bioimaging and different therapies into one nanoplatform is a promising strategy for biomedical applications, but remains a great challenge. Herein, we have synthesized a biocompatible folic acid (FA) functionalized gold nanorod@polypyrrole@Fe3O4 (GNR@PPy@Fe3O4-FA) nanocomposite through a facile method. The conjugated FA has endowed the nanocomposite with the ability to recognize targeted cancer cells. Importantly, the nanocomposite has been successfully utilized for magnetic resonance (MR), computed tomography (CT) and photoacoustic (PA) multimodal imaging. Moreover, the GNR@PPy@Fe3O4-DOX nanocomposite shows pH-responsive chemotherapy and enables the integration of photothermal therapy and chemotherapy to achieve superior antitumor efficacy. The GNR@PPy@Fe3O4-DOX nanocomposites have a drug release of 23.64%, and the photothermal efficiency of the GNR@PPy@Fe3O4 nanocomposites reaches 51.46%. Cell viability decreases to 15.83% and 16.47% because of the combination of chemo-photothermal therapy effects. Moreover, the GNR@PPy@Fe3O4-DOX-FA nanocomposite could target cancer cells via folic acid and under a magnetic field. The in vivo multimodal imaging and chemo-photothermal therapy effects showed that the GNR@PPy@Fe3O4-DOX-FA nanocomposites are a good contrast and theranostic agent. Thus, this multifunctional nanocomposite could be a promising theranostic platform for cancer diagnosis and therapy.
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DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 26
·9631-9638
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IF 4.052
Weiwei Zhao,Weikang Wang,Jiali Peng,Tiantian Chen,Beibei Jin,Shujuan Liu,Wei Huang,Qiang Zhao
Two-dimensional (2D) metal porphyrin frameworks (MPFs) with a π-conjugated skeleton, high surface area, and more accessible active sites have been applied as active materials for supercapacitors, but the poor electrical conductivity limits the enhancement of electrochemical performance. Moreover, MPF-based flexible supercapacitors have been rarely reported. Here, for the first time, we fabricated wrinkled 2D ultrathin 5,10,15,20-tetrakis(4-carboxylphenyl)porphyrin copper(II) (Cu-TCPP) nanosheets through the surfactant-assisted synthetic method. The as-obtained wrinkled Cu-TCPP nanosheets were further composited with conductive polypyrrole (PPy) to construct a flexible Cu-TCPP/PPy film through the combination of the electrophoretic deposition method and electrochemical polymerization technology. The wrinkled 2D ultrathin Cu-TCPP nanosheets not only offer macroporous channels for fast ion/electron transport, but also effectively reduce the transmission path of electrolyte ions. The PPy affords 3D conductive networks for rapid electron transport and enhances the electrochemical kinetics. The synergistic effect of Cu-TCPP and PPy leads to the enhanced supercapacitive performance of Cu-TCPP/PPy in comparison with the individual components. As a result, the freestanding Cu-TCPP/PPy electrode shows a capacitance of 340.6 mF cm−2 at 1 mA cm−2, 71.14 F cm−3 at 0.1 A cm−3, and 163.34 F g−1 at 0.2 A g−1, more than 45% greater than that of the pristine PPy film of 224.6 mF cm−2, 48.15 F cm−3 and 92.2 F g−1 at the corresponding current densities. Moreover, the fabricated binder-free symmetric supercapacitor possesses a maximum energy density of 2.27 μW h cm−2 at the highest power density of 50 μW cm−2. This work provides a new strategy to design 2D metal–organic framework-based flexible all-solid-state supercapacitors with high energy storage performances.
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RSC Advances
·
2019
·Vol. 9
·期 12
·6890-6897
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IF 3.049
Huijun Liu,Qiang Zhao,Kewei Wang,Zhen Lu,Feng Feng,Yong Guo
In this study, polypyrrole nanofiber (PPyNF)/NiOx composites were synthesized by a simple and fast microwave method. The samples were characterized using differential scanning calorimetry and thermal gravimetric analysis (DSC/TGA), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). Furthermore, the synthesized PPyNF/NiOx nanocomposites were electrochemically characterized using galvanostatic charge–discharge, cyclic voltammetry and electrochemical impedance spectroscopy (EIS) techniques. They showed the highest specific capacitance of 657 F g−1 at 0.5 A g−1, demonstrating their potential application in supercapacitors.
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 30
·18092-18099
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IF 10.733
Zheng Zhang,Peng Mu,Jingxin Han,Jingxian He,Zhaoqi Zhu,Hanxue Sun,Weidong Liang,An Li
Solar vapor generation based on light-to-heat conversion via photothermal materials has been considered as one of the emerging technologies for utilizing solar energy. Here, we report the fabrication of a novel monolithic aerogel (PNGA) composed of hydrophilic treated MnO2 nanowires and reduced graphene oxide (rGO) followed by in situ coating of polypyrrole on the surface of the PNGA to construct a light-to-heat conversion layer for efficient solar steam generation. Analysis of the morphology and porosity of the PNGA shows that the aerogel is full of interconnected pores and open channels with a low apparent density (0.127 g cm−3) and large specific surface area (1142.7 m2 g−1), which endow it with excellent thermal insulation (a low thermal conductivity of 0.21882 W m−1 K−1 in the wet state), self-floating and rapid water transmission properties. Benefiting from the polypyrrole coating, the PNGA shows a superintense optical absorption of ca. 100%. Interestingly, a superhydrophilic wettability could be achieved after surface modification of the PNGA with phytic acid, which could dramatically enhance its water transportation ability. Furthermore, the PNGA maintains a certain mechanical strength (0.08 MPa under 30% strain), thus making it mechanically robust to withstand the harsh environment. Taking the advantages mentioned above, our PNGA possesses an outstanding energy conversion efficiency of 93.8% under 1 kW m–2 irradiation, which is 4.9 times that of pure water (19.1%). In addition to the excellent ionic isolation and dye liquid treatment ability, the PNGA shows excellent stability and its energy conversion efficiency remains nearly unchanged after ten consecutive tests. Based on its excellent mechanical stability and high recyclability and a simple and scalable manufacture process, our PNGA sample may have great potential as an efficient photothermal material for a wide range of large-scale applications such as solar steam generation, wastewater treatment, seawater desalination and so on.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 6
·1-8
·
IF 5.479
Wang Jing,Li Bingzhi,Lu Qiaoyun,Li Xiaoyun,Weng Chenyuan,Yan Xiaoqiang,Hong Junli,Zhou Xuemin
The authors describe a versatile aptasensing scheme based on the use of polypyrrole nanoparticles (PPyNPs) and DNA-silver nanoclusters (DNA-AgNCs) for multiple target detection. The DNA-AgNCs consist of two functional domains, viz. (a) a nucleation domain for attaching the metal core of the nanoclusters, and (b) a recognition domain which consists of a single-stranded aptamer. In the absence of analytes, the single-strand recognition domain will be absorbed onto the surface of the PPyNPs through π stacking and hydrophobic interactions. As a result, the red fluorescence of the DNA-AgNCs (with excitation/emission peaks at 535/625 nm) is quenched by the PPyNPs. On introducing the analytes, the DNA-AgNCs will bind them. This leads to the desorption of DNA-AgNCs and the recovery of the red fluorescence. Based on the above strategy, a versatile, sensitive and selective aptasensor was established for detection of adenosine, thrombin and interferon-gamma. The method was applied to the detection of the above targets in (spiked) serum samples and gave satisfactory results, with detection limit of 0.58 nM for IFN-γ, 0.39 nM for adenosine, and 2.2 nM for thrombin. The use of PPyNPs results in uniquely low non-specific absorption and in improved analytical results in case of real-sample analysis when compared to previously reported methods.
Schematic illustration of DNA-silver nanoclusters and polypyrrole nanoparticles in an aptasensor for detection of multiple targets.
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