CARBOHYDRATE POLYMERS
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2019
·
IF 6.044
Hao Zhuo,Yijie Hu,Zehong Chen,Linxin Zhong
Energy storage and conversion systems have recently attracted great interest in application of various electronic devices. Conductive polymers are promising pseudocapacitive materials for supercapacitors due to their low cost, low environmental impact, high pseudo capacitance, and ease of fabrication. However, the poor cycling stability limits their application. Here, we use cellulose as a carbon precursor to prepare a hierarchical porous carbon aerogel as a support for conductive polymer polypyrrole (PPy). The hierarchical porous architecture not only enables the efficient penetration and uniform loading of PPy throughout the carbon network, but also ensures a rapid transfer of electrolytes and the high accessibility of PPy. The as-prepared hybrid shows a high specific capacitance of 387.6 F g −1 (0.5 A g −1 in 1.0 M H 2 SO 4 ) and excellent cycling stability (92.6% capacitance retention after 10,000 cycles). This work provides an effective method to sustainably fabricate porous composite electrodes from renewable cellulose for supercapacitor.
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高影响因子
Acta Biomaterialia
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2019
·
IF 6.638
Qiang Yang,Pan Li,Haitao Ran,Jingyuan Wan,Huan Chen,Huali Chen,Zhigang Wang,Liangke Zhang
A theranostic nanoplatform (DTX/PFH@PPy-FA) for multi-modal imaging-guided photothermal-chemotherapy has been constructed. Lipid-perfluorohexane (PFH) nanodroplet loaded with docetaxel (DTX) was coated with a polypyrrole (PPy) shell. Then the folic acid (FA) molecule with active tumor-targeting function was modified on the surface of PPy shell. Due to the good photothermal conversion performance, PPy shell can raise the temperature under the near infrared laser irradiation, which not only produces photothermal effect to kill tumor cells, but also promotes liquid-gas phase change of PFH, and produces ultrasound imaging effect. The results of photothermal experiment and imaging experiment confirmed that the obtained DTX/PFH@PPy-FA possessed good photothermal, photoacoustic imaging and ultrasound imaging effects in vitro and in vivo . The results of in vitro cell experiments showed that DTX/PFH@PPy-FA had a active targeting ability to tumor cells, and its photothermal-chemotherapy synergistically inhibited the proliferation of tumor cells. In vivo study on 4T1-bearing BALB/c mice indicated that the photothermal-chemotherapy of DTX/PFH@PPy-FA not only effectively inhibited the growth of 4T1 breast cancer, but also inhibited lung metastasis. This multifunctional nanoparticle is expected to become a new nanoplatform for the visualized photothermal-chemotherapy of cancer. Statement of Significance In this work, we presented a multi-modal imaging-guided photothermal-chemotherapy theranostic nanoplatform (DTX/PFH@PPy-FA) for visualized treatment of breast cancer. The docetaxel (DTX) loaded perfluorohexane (PFH) nanodroplets (DTX/PFH@SPC) were firstly prepared and then coated with polypyrrole shell (PPy). Then, PEGylated folic acid was covalently modified to obtain the folate-targeted multifunctional nanoparticle (DTX/PFH@PPy-FA). Due to the good photothermal conversion performance, PPy shell can raise the temperature under the near infrared laser irradiation, which not only produces photothermal effect to kill tumor cells, but also promotes liquid-gas phase change of PFH, and produces good ultrasound imaging effect. The PPy shell also imparts photoacoustic imaging characteristics to the nanoparticles. Experimental results show that our prepared DTX/PFH@PPy-FA possesses folic acid-mediated tumor targeting ability, ultrasound and photoacoustic imaging, and photothermal-chemotherapy synergistic effect. This multi-functional nanoparticle is expected to become a new platform for the visualized photothermal-chemotherapy of breast cancer.
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高影响因子
Journal of Materials Chemistry A
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2019
·Vol. 7
·期 39
·22296-22306
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IF 10.733
Ying Xu,Hongbo Xu,Zhigao Zhu,Haoqing Hou,Jinlong Zuo,Fuyi Cui,Dongmei Liu,Wei Wang
So far, solar distillation based on photothermal membranes has attracted ever-increasing attention in less developed regions for water purification. The raw water resources for solar evaporation were generally beyond the natural hydrological cycle and are highly saline and corrosive. In this process, a core–shell structured PDA/PEI/PPy@PI nanofibrous membrane (NFM), comprising a robust PI nanofibrous substrate, PPy photothermal layer and anticorrosion PDA/PEI layer, was developed as a photothermal membrane, which exhibited broadband solar absorption (93.0%) and sustained anti-corrosion capacity for 30 days. Besides, the core–shell structure can effectively prevent the swelling of the membrane and maintain excellent mechanical strength even in the wet state. An evaporation system based on the PDA/PEI/PPy@PI NFM achieved a high solar evaporation rate of ≈1.43 kg m−2 h−1, corresponding to a light-to-vapor efficiency of ≈86.9% under 1 sun illumination. Due to its sustained corrosion-resistance, mechanical durability in the wet state and high solar evaporation capacity, this NFM is expected to have great potential for long-term solar distillation applications.
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ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Qing Chang,Ruimeng Wang,Jiaxing Wang,Yaseen Muhammad,Zhenxia Zhao,Zhenfei Feng,Zuqiang Huang,Yanjuan Zhang,Zhongxing Zhao
A N-doped hollow copolymer tube (NHCT) was fabricated via template-free one-pot asynchronous polymerization strategy. Discrepancies of monomer polymerization speed and their hydrophilic–hydrophobic interaction resulted in the assembly of a hollow tube having inner diameter and double wall thickness of ∼230 and 40 nm, respectively. The formation and growth mechanism of NHCT analyzed via advanced characterization revealed that the unique growth processes tuned a demarcating surface layer between inner (hydrophilic) and outer (hydrophobic) layers. The screening and recognition ability of NHCT were determined for two specific dipeptides (WW and RR) possessing great discrepancies in hydrophilicity and angiotensin converting enzyme inhibitory (ACE-I) activity. NHCT realized high adsorption capacity (1.57 mmol/g) and selectivity (∼1274) for hydrophilic dipeptide RR (low ACE-I activity) from the mixture of RR/WW. As a result, ACE-I activity for residual solution were enhanced about 4.1 times as compared to original solution from natural silkworm pupae protein hydrolysate. Awarding to these results and its facile and discerning ability, NHCT can be envisioned to be of great value for the separation of small functional peptides from a natural edible source.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2019
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IF 4.182
Lixue Gai,Lin Guo,Qingda An,Zuoyi Xiao,Shangru Zhai,Zhongcheng Li
Functionalized SBA-15 has attracted considerable interest owing to its highly ordered mesoporous structure, well thermal stability and great potential applications. Meanwhile, as was demonstrated, polypyrrole (PPy) with good electrical conductivity is also a very popular absorber-related candidate. Herein, long-rod shape SBA-15/PPy-X composites were successfully synthesized via a simple hydrothermal treatment by combining in situ chemical oxidative polymerization method. The SBA-15/PPy-X composites exhibited effective absorption band (RL < −10 dB) and electromagnetic wave absorption capacities in comparison with the pristine SBA-15 sample, which were pertinent to the properties of strong dielectric loss and better impedance matching, implying enhanced dielectric properties by modifying with suitable amount of PPy species. The minimum reflection loss (RL) of SBA-15/PPy-0.5 composites reached −44.7 dB with a very low filler loading (15 wt%), corresponding to the thickness of 3.5 mm at 8.9 GHz. Besides, the effective absorption bandwidth was up to 6.1 GHz (11.1–17.2 GHz) and 3.8 GHz (7.4–11.2 GHz) with the thickness of 2.5 mm and 3.5 mm, respectively, which can cover most of the Ku-band (12–18 GHz) and X-band (8–12 GHz). The results indicated that the newly designed silica-based SBA-15/PPy-X composites can be promising EMW absorbers with an excellent performance at a target frequency (typical radar channels).
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POLYMER DEGRADATION AND STABILITY
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2019
·
IF 3.78
Zulan Liu,Songmin Shang,Ka-lok Chiu,Shouxiang Jiang,Fangyin Dai
The electrically conductive and flame-retardant bifunctional cotton fabrics were fabricated by polymerizing pyrrole (Py) onto the cotton fabrics and followed by doping phytic acid (PA) via a chemical oxidation method. The prepared cotton fabrics were then characterized by Four-point Probes Resistivity Measurement, Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), Fourier Transform Infrared Spectroscopy (FTIR), Vertical Burning Test and Thermogravimetric Analysis (TGA). The results of SEM and FTIR tests indicated that pyrrole was successfully polymerized on the cotton fabrics. The EDS measurements showed that the phosphorus increased with increasing phytic acid concentration. The results of four-point probes resistivity measurement, vertical burning test and TGA test exhibited that both the electrical conductivity and the Limit Oxygen Index (LOI) of the treated fabrics increase with increasing phytic acid concentration. The LOI of the cotton fabric increased from 18% to 37.6% after the cotton fabric was deposited with polypyrrole and doped with phytic acid. The conductivity of the treated cotton fabrics is mainly affected by the pyrrole concentration and can reach about 0.28 S cm −1 .
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BIOELECTROCHEMISTRY
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2019
·
IF 4.474
Dingding Duan,Xiaojing Si,Yaping Ding,Li Li,Guohong Ma,Lu Zhang,Bingyu Jian
In this paper, we constructed MIL-53 (AlOHbdc, bdc = benzene-1,4-dicarboxylate) /CNTs and Prussian blue (PB) as the double sensitization material of the sensing platform, in which the MIL-53/CNTs hybrid can not only increase the specific surface area but also increase the conductivity of the sensor and PB can play a role in amplifying electrical signals and accelerating electron transmission. Pyrrole was used as monomer and E2 was used as template for electropolymerization to form conductive film. Moreover, the overoxidation/dedoping elution method were used to simplify the experimental process. Under optimal conditions, the MIECS exhibited an excellent sensitivity and high selectivity with a wide linear response range between 10 −14 to 10 −9 mol L −1 and an estimated detection limit of 6.19 × 10 −15 mol L −1 .
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Nanomaterials
·
2019
·Vol. 9
·期 6
·833
·
IF 4.034
Zhi Zhang,Qi Lv,Yiwang Chen,Haitao Yu,Hui Liu,Guangzhen Cui,Xiaodong Sun,Ling Li
To reduce electromagnetic pollution as well as increase the accuracy of high-precision electronic equipment, more attention has been paid to new electromagnetic wave (EMW) absorbing materials, which have the advantages of strong absorption, wide absorption bands, and a narrow thickness. In this study, a novel ternary type of the NiS2@rGO/polypyrrole (PPy) sandwich-like structured composites was synthesized via a facile two-step method, in which the hydrothermal method was used to prepare NiS2@rGO binary composites and then the in situ polymerization method was used to synthesize the PPy, which acted as the outer layer of the sandwich-like structure. The morphologies and electromagnetic absorption performance of the NiS2@rGO/PPy were measured and investigated. A sample with 6 wt% NiS2@rGO/PPy loading paraffin-composite obtained an outstanding reflection loss (RL) of −58.7 dB at 16.44 GHz under a thickness of 2.03 mm. Simultaneously, the effective electromagnetic wave absorption bandwidth for RL < −10 dB, which covered 7.04 to 18.00 GHz (10.96 GHz), was achieved by changing the thickness of the absorber from 2.0 to 3.5 mm. The results not only suggest that the NiS2@rGO/PPy composite has excellent performance in the field of EMW absorption but also prove that the novel sandwich-like structure can contribute to appropriate impedance matching through multiple relaxation and interfacial polarization processes.Keywords:graphene;polypyrrole;sandwich-like structure;electromagnetic absorption
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Nanoscale
·
2019
·Vol. 11
·期 36
·16860-16867
·
IF 6.97
Jing-Wen Gao,Miao-Miao Chen,Wei Wen,Xiuhua Zhang,Shengfu Wang,Wei-Hua Huang
Electrochemiluminescence (ECL) nanomaterials are usually deposited compactly on the surface of electrodes, which may cause poor mass transfer of reactants, thereby resulting in low ECL efficiency. In this work, we developed a novel kind of luminescent material denoted as C–Au-luminol nanospheres (C–Au-Lum NSs) by high dispersion of luminophores on porous carbon nanospheres (PCNSs). C–Au-Lum NSs were facilely prepared by the in situ reduction of chloroauric acid with the luminescent reagent luminol (Lum) on the nano-pores of PCNSs. Plenty of luminescent Au-Lum NPs were dispersedly concentrated inside the numerous pores and hollow interiors of PCNSs, effectively increasing the mass transfer of reagents and accelerating the electron transport inside the porous nanospheres. This greatly improved the availability of luminophores and endowed C–Au-Lum NSs with excellent ECL emission. After further integrating with enzymatic circulation and strand displacement, an ultrasensitive ECL biosensor was achieved for the ultrasensitive detection of an important tumor biomarker, mucin1. The logarithmically linear range from 0.1 pg mL−1 to 1 ng mL−1 with the detection limit of 47.6 fg mL−1 (S/N = 3) was achieved, demonstrating the superior performance of C–Au-Lum NSs. This work would provide new ideas for the construction of high-performance ECL sensing platforms for diverse applications.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 43
·期 30
·12126-12136
·
IF 3.069
Lingzhe Suo,Jing Zhao,Xinyi Dong,Xun Gao,Xinzhu Li,Jianfeng Xu,Xiumei Lu,Longshan Zhao
A novel polyaniline–polypyrrole functionalized SiO2-coated magnetic graphene oxide composite (MGO/SiO2@PANI–PPy) was prepared as a new magnetic solid-phase extraction (MSPE) adsorbent for separation and pre-concentration of chromium (Cr) and lead (Pb) at trace levels in food and environmental water samples followed by the use of inductively coupled plasma mass spectrometry (ICP-MS). Fourier transform infrared (FTIR) spectroscopy, vibrating sample magnetometry (VSM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) were used to characterize the nanocomposite. Various parameters affecting the extraction yield of heavy metals were optimized using a Box–Behnken design (BBD) through the response surface methodology (RSM). Under optimum conditions, the limits of detection (LODs) were 4.808 ng L−1 for Cr(III) and 3.401 ng L−1 for Pb(II) with relative standard deviations (RSDs) of less than 5% (n = 6). Furthermore, the maximum adsorption capacities of this new sorbent were 188.9 and 213.3 mg g−1 for Cr(III) and Pb(II), respectively. Finally, the developed method was successfully applied for determination of trace Cr(III) and Pb(II) in rice, milk, wine and environmental water samples with recoveries within 95.4–105%.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Chengheng Wu,Amin Liu,Suping Chen,Xiaofeng Zhang,Lu Chen,Yuda Zhu,Zhanwen Xiao,Jing Sun,Hongrong Luo,Hongsong Fan
Natural nerve tissue is composed of nerve bundles with multiple aligned assembles, and matrix electroconductivity is beneficial to the transmission of intercellular electrical signals, or effectively deliver external electrical cues to cells. Herein, aiming at the biomimetic design of the extracellular matrix for neurons, we first synthesized electroconductive polypyrrole (PPy) nanoparticles with modified hydrophilicity to improve their uniformity in collagen hydrogel. Next, cell-laden collagen–PPy hybrid hydrogel microfibers with highly oriented microstructures were fabricated via a microfluidic chip. The hydrogel microfibers formed a biomimetic three-dimensional microenvironment for neurons, resulting from the native cell adhesion domains, oriented fibrous structures, and conductivity. The oriented fibrous microstructures enhanced neuron-like cells aligning with fibers’ axon; the matrix conductivity improved cell extension and upregulated neural-related gene expression; moreover, external electrical stimulation further promoted the neuronal functional expression. This mechanism was attributed to the electroconductive matrix and its delivered electrical stimulation to cells synergistically upregulated the expression of an L-type voltage-gated calcium channel, resulting in an increase in the intracellular calcium level, which in turn promoted neurogenesis. This approach has potential in constructing the biomimetic microenvironment for neurogenesis.
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Sustainable Energy & Fuels
·
2019
·Vol. 3
·期 11
·3000-3008
·
IF 4.912
Wei Huang,Gaoyue Hu,Cheng Tian,Xiaohong Wang,Jinchun Tu,Yang Cao,Kexi Zhang
Solar steam generation has emerged as a promising and sustainable method of addressing the water shortage issue. Although various materials and structures have been reported, designing a highly efficient steam generation device with excellent salt resistant performance remains a great challenge. For the first time, a polypyrrole (PPy)–wood device has been prepared through a simple “soak and polymerization” process by in situ polymerization of pyrrole monomers into a three-dimensional (3D) porous wood matrix. The PPy particles decorated on the wood matrix can convert incident light into heat while the 3D porous wood matrix can further enhance light absorption based on light harvesting and multiple scattering effects, which allows the PPy–wood light absorption to reach as high as 97.5% in the spectral range from 250 nm to 2500 nm. Owing to the low thermal conductivity of wood, the PPy–wood can localize the converted heat at the surface of the device, enabling efficient steam generation. The hydrophilicity and the numerous aligned microchannels of the PPy–wood ensure constant water supply to the air–water interface. All these merits endow the PPy–wood with a high solar energy conversion efficiency of 83% under 1 Sun, with an evaporation rate of 1.33 kg m−2 h−1. Moreover, the fabricated PPy–wood also shows good structure stability and cycling stability as well as excellent salt resistant performance. Benefiting from the low-cost of wood and the simple fabrication process, the PPy–wood with the above merits is one of the most suitable candidates for solar desalination.
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