Journal of Materials Chemistry B
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2016
·Vol. 4
·期 48
·8016-8024
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IF 4.872
Weifeng Zhao,Zhiyuan Han,Lang Ma,Shudong Sun,Changsheng Zhao
A new class of hydrogels distinguished by electro-conductivity and high hemo-compatibility, which resemble biological tissues, are promising candidates for a plethora of biomedical applications. This work describes the design of highly elastic and biocompatible hydrogels using polypyrrole (PPy) as the conductivity media. The bio-inspired design of heparin-mimicking sodium alginate (HMSA) combined with tough alginate/polyacrylamide (PAM) is selected to form chemical and physical cross-linked binary hydrogel networks, while the incorporation of interfacial polymerized PPy endows the hydrogels with electro-conductivity. The resulting hydrogels exhibit a mesh-like hierarchical structure with excellent mechanical strength; moreover, the hydrogels show greatly enhanced electro-conductivity (up to 0.63 S m−1). In addition, due to the presence of the unique heparin-mimicking structure, the hydrogels possess a desirable anticoagulant ability and biocompatibility demonstrated via antithrombotic evaluations together with cell culture observations. The facile synthesis of HMSA/PAM/PPy hydrogels and their robust physical, chemical and biological performance make them attractive components for the future generation of biosensors and bioelectrodes.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2017
·Vol. 27
·期 10
·1604423
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IF 12.124
Chong-Bo Ma,Baoji Du,Erkang Wang
As a new concept, a self-crosslink mechanism for hydrothermal synthesis of poly(vinyl alcohol) (PVA) aerogel, assisted by multiwall carbon nanotubes, is reported. PVA, working as a low-cost and commercially available raw material, exempts the complicated synthesis process and reserves its nontoxic nature since no organic crosslinkers are used in the synthesis process. The crosslink density and many other properties of the products can be easily tuned by simply altering the concentration of PVA precursors, which is considered to be another feature of our method. Dehydration between hydroxyl groups occurs in the hydrothermal process, leading to a reverse wettability of the products from hydrophilic to hydrophobic, thus their absorbing capacity for several organic solvents, such as bean oil and crude oil, is investigated. The absorbate has 10–52 times the original weight of the aerogel. As exhibited by the cytotoxic tests, the product has neglectable toxicity, suitable for application in environmental bioengineering. Furthermore, the product can be used as a facile substrate for transformation into conductive aerogel by in situ hybridizing with polypyrrole, showing a conductivity of 0.16 S m −1 . As it is rich in hydroxyl groups, the aerogels are believed to be further functionalized by the reactions related to the hydroxyl group.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2017
·
IF 2.714
Xiao-Hui Dai,Wei-He Yang,Wen-Li Yan,Jia-Ming Hu,Yi-Rong Dai,Jian-Ming Pan,Yong-Sheng Yan
Different generations of porphyrin-cored dendrimers consisting of novel siloxane- poly(amido amine) dendron-like arms have been synthesized via copper(I)-catalyzed Huisgen 1,3-dipolar cycloaddition reaction of azide-modified 5,10,15,20-tetrakis(4-hydroxyphenyl)-porphyrin with different generations of propargyl focal point novel siloxane-poly(amido amine) typed dendron (Si-PAMAM). The used different generations of Si-PAMAM were obtained by the “arm-first” strategy based on the Michael addition reaction and Amidation reaction, orderly. The structure of porphyrin dendrimers is established by 1 H NMR, 13 C NMR, MALDI-TOF-MS and FT-IR analysis. PP-Si-PAMAM-Dm (m = 1, 2, and 3), not only gave strong fluorescence emission and the intensity increased significantly as the generation growing, but also showed a remarkable pH-responsive in fluorescence emission. These interesting properties indicate that synthesized porphyrin dendrimers may be able to act as pH-responsive probes suitable for biomedical imaging, diagnosis and treatment.
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ACS Biomaterials Science & Engineering
·
2016
·
IF 0
Zi-Fei Zhou,Fan Zhang,Jian-Guang Wang,Quan-Chi Chen,Wei-Zhi Yang,Ning He,Ying-Ying Jiang,Feng Chen,Jun-Jian Liu
Peripheral nerve injuries represent a great challenge for surgeons. The conductive neural scaffold has experienced increasing interest because of its good biocompatibility and similar electrical properties as compared to those of a normal nerve. Herein, nerve conduits made from poly(d,l-lactide)-co-poly(ethylene glycol) and polypyrrole (20%, 30%, and 50%) (PELA–PPY) were prepared by electrospinning, and used in regeneration of peripheral nerve defects. The results of an in vitro experiment indicated a high biocompatibility for the as-prepared materials, supporting the attachment and proliferation of a rat pheochromocytoma PC-12 cell. Furthermore, the PELA–PPY nerve conduit implanted in the sciatic nerve defects (10 mm) of the Spraguee–Dawley rats for 12 weeks showed similar results with the autograft, while it demonstrated a better outcome than the PELA nerve conduit in electrophysiological examination, sciatic function index, total amount of regenerated myelinated nerve fibers, axon diameter, myelin thickness, and several immunohistochemistry indices (S-100, laminin, neurofilament, bromodeoxyuridine, and glial fibrillary acidic portein). We supposed that the bioactivity is mainly generated by the PPY in composite nanofibers which could transmit self-originated electrical stimulation between cells. Due to the facile preparation and excellent in vivo performance, the PPY–PELA nerve conduit is promising for use as a bioengineered biomaterial for peripheral nerve regeneration.
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JOURNAL OF POWER SOURCES
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2016
·
IF 6.333
Shaoyi Lyu,Huanjun Chang,Feng Fu,La Hu,Jingda Huang,Siqun Wang
A paper-based wearable supercapacitor with excellent foldability and tailorability is fabricated from a chopped carbon fiber (CCF)-reinforced cellulose paper electrode material by coating with reduced graphene oxide (RGO) and polypyrrole (PPy) via in situ polymerization . The CCFs not only form an interpenetrating conducting network that acts as highly conductive electron transfer highways for the RGO/PPy layer in the paper electrode, but also endow the resulting electrode with an excellent areal capacitance of 363 mF cm −2 and a volumetric energy density of 0.28 mW h cm −3 . Further, the CCFs give the electrode remarkable mechanical robustness, guaranteeing foldability and tailorability, with only slight loss of capacitance after repeated folding 600 times. Even after being subjected to severe cut-in fracture, the capacitance retention is up to 84%, indicating outstanding damage tolerance. The present study reveals a promising candidate for flexible wearable energy storage devices that are required to function in harsh environments.
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Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 33
·12955-12962
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IF 8.262
Zhizhang Yuan,Qing Dai,Yuyue Zhao,Wenjing Lu,Xianfeng Li,Huamin Zhang
Polypyrrole (PPY) modified porous poly(ether sulfone) (PPY/PES) membranes with excellent ion conductivity and high ion selectivity are prepared and employed in vanadium flow batteries (VFBs). The porous PES membranes are modified through in situ polymerization of pyrrole (PR) by using VO2+ as the oxidizing agent. The positively charged PPY nanoparticles can effectively retain vanadium ions via the Donnan exclusion and afford excellent ion conductivity through the interaction between the sulfuric acid in electrolytes and the nitrogen elements in PPY. As a consequence, the designed PPY/PES porous membranes demonstrate high ion selectivity and excellent ion conductivity along with exceptional chemical stability under VFB operation conditions. The PPY/PES porous membranes exhibited a very prospective performance for vanadium flow applications, showing a coulombic efficiency (CE) of 96.30% and an energy efficiency (EE) of 87.20% at a current density of 80 mA cm−2, which are much better than those of a VFB with a Nafion 115 membrane (coulombic efficiency of 93.16% and energy efficiency of 82.29%). Furthermore, a VFB using the PPY/PES porous membranes delivers a stable battery efficiency after continuously operating for more than 100 cycles, displaying good potential usage in VFB applications.
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Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 46
·18008-18014
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IF 8.262
Hongli An,Ruikang Zhang,Zhenhua Li,Lei Zhou,Mingfei Shao,Min Wei
Nitrogen-doped carbon nanotubes (NCNTs) are recognized as one of the most promising oxygen reduction reaction (ORR) catalysts, while developing a preparation protocol for CNT-based ORR catalysts with cost-effective synthesis, high activity and durability is still a challenge. In this work, we report the fabrication of N-doped CNT catalysts with a homogeneous distribution of dopants in the CNT matrix by pyrolysis of a core–shell nanostructured CNTs@polypyrrole nanocomposite (CNTs@PPy). The as-obtained NCNTs exhibit excellent performance in electrocatalytic oxygen reduction with an onset potential of 0.95 V vs. RHE, a diffusion-limited current of 6.82 mA cm−2 and excellent stability in alkaline media, much superior to that of reported CNT-based ORR catalysts as well as commercial Pt/C. Moreover, the ratio of different nitrogens (pyridinic, pyrrolic and graphitic N) can be tuned easily by changing the coating amount of PPy in the CNTs@PPy core–shell precursors; and the results indicate that the pyridinic-N in the CNTs@PPy derived NCNTs plays a key role in promoting the ORR performances.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
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2016
·Vol. 34
·期 3
·1600233
·
IF 4.367
Yanzhou Jiang,Yan Gu,Guangdi Nie,Maoqiang Chi,Zezhou Yang,Ce Wang,Yen Wei,Xiaofeng Lu
In this paper, a novel strategy for the fabrication of reduced graphene oxide (rGO)/Cu 8 S 5 /polypyrrole (PPy) composite nanosheets with Cu 8 S 5 nanoparticles and PPy layer anchored on the surface of rGO as peroxidase-like nanocatalyst is reported. During the synthesis, graphene oxide (GO)/CuO composite nanosheets are prepared first and used as templates, then the sulfuration of CuO and polymerization of pyrrole are accompanied with the reduction of GO, resulting in ternary rGO/Cu 8 S 5 /PPy composite nanosheets. The synthesized Cu 8 S 5 nanoparticles with a diameter in the range from tens to hundreds of nanometers are dispersed within PPy decorated rGO nanosheets. The resultant ternary rGO/Cu 8 S 5 /PPy composite nanosheets exhibit a higher peroxidase-like catalytic activity toward the oxidation of 3,3′,5,5′-tetramethylbenzidine in the presence of H 2 O 2 than GO/CuO and rGO/CuS composite nanosheets, revealing a synergistic effect on their activity. The as-prepared rGO/Cu 8 S 5 /PPy platform provides a simple colorimetric approach for the detection of H 2 O 2 and phenol with a high sensitivity. This work offers a new way for the fabrication of rGO-based nanocomposite with superior enzyme-like activity, which displays great potential applications in biocatalysis and environmental monitoring.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Junru Wang,Dan Liu,Jianhu Zhang,Feiyan Gong,Xu Zhao,Zhijian Yang
Safety performance under external stimuli plays a crucial role for energetic materials. Therefore, desensitization of high explosive arouses widespread research interests in the field of energetic materials. Nevertheless, synergistically reducing impact and electrostatic spark sensitivities of 1,3,5,7-tetranittro-1,3,5,7-tetrazocane (HMX) remains challenging. Herein, a novel strategy concerning conductive polymer coating was proposed to solve this issue. Theoretically, the polypyrrole (PPy) can form a complete shell and strong interaction with HMX crystals. The HMX@PPy composite has been successfully achieved by in-situ polymerization, exhibiting superior sensitivities (impact: from 7 J to 27.5 J and electrostatic spark: from 0.4 J to 1.68 J) among reported HMX-based energetic materials. In addition, the thermal phase stability of HMX can also be visibly improved with sluggish phase-transition kinetics by introducing PPy coating. The current study provides a design concept for high energy explosives with low sensitivity and improved comprehensive performances.
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Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Gaoyuan Liu,Xinxin Yin,Jing Xie,Jindou Hu,Aize Hao,Zhenjiang Lu,Yali Cao
Transition metal oxides (TMOs) are considered promising anode materials for lithium-ion batteries (LIBs) because of their high theoretical capacity. However, their use in LIBs is limited by factors such as low initial coulombic efficiency, substantial volume changes, and low electrical conductivity. Here, amorphous MoO2 capped with different carbon sources is ingeniously designed by controlling the calcination temperature and different carbon sources. Electrochemical kinetics and material characterization show that the amorphous structure not only enhances its electronic conductivity, but also optimizes the lithium-ion (Li+) migration mode, thus improving its rate performance. Furthermore, the pore sizes produced by different carbon sources were found to have different effects on the performance of LIBs. Meanwhile, the Li+ storage mechanism of the amorphous MoO2−x@C was revealed by in-situ XRD analysis. As expected, the amorphous MoO2−x@C exhibits excellent cycling stability, maintaining a discharge specific capacity of 601.4 mA h g−1 at 5.0 A g−1 for 800 cycles. In particular, the MoO2−x@C||LiCoO2 full cell still possesses a capacity of 109.8 mA h g−1 at 0.2 C for 80 cycles. This endeavor will provide an experimental idea for molybdenum-based oxide high-performance anode materials.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Yun Xue,Xingan Feng,Jiadong Wang,Jianzhang Gao,Lijun Zhang,Qi Chen,Fuqiu Ma,Yongde Yan
The immobilization of uranium in nuclear wastewater is of paramount importance for environmental and human health. However, there is a paucity of research on the immobilization of uranium in alkaline wastewater, particularly with regards to the application of novel electrodes. This article presents the utilization of an electrochemically polymerized polypyrrole stainless steel (PPy-SUS304) electrode for the effective electrochemical deposition and removal of uranium from alkaline wastewater containing uranium. According to the electrodeposition results, the uranium deposition efficiency of the novel electrode reached 96.82 %, with a uranium deposition rate of 0.048 mg U/(h·cm 2 ) and a charge efficiency of 0.055 mg U/C. These findings demonstrate the successful electrochemical reduction of UO 2 (CO 3 ) 3 4- in alkaline uranium-containing wastewater using the novel electrode, resulting in improved charge deposition efficiency. The electrode surface products were investigated using scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDS), and X-Ray Photoelectron Spectroscopy (XPS). The SEM and EDS results demonstrate the formation of a uniform PPy film on the surface of SUS304. In addition, the White light interferometer (WLI) test reveals that the PPy-SUS304 electrode exhibits increased roughness compared to the SUS304 electrode. The XPS results revealed that the electrode surface products of PPy-SUS304 were actually U compounds constituted of U(IV) oxides or hydroxides. This study provides a new perspective for the development of novel electrodes to suppress side reactions and efficiently recover uranium from alkaline uranium-containing wastewater.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2025
·
IF 2.6
Sun Yiwei,Luo Yuting,He Yuyang,Wang Haoxiang,Wang Ruoyu,Lu Mengqi,Li Ke,Wu Siqi,Wei Sucan,Song Huiqiao,Xu Dongpo
A highly efficient electrochemical molecularly imprinted sensor for the detection of chloramphenicol (CAP) was prepared using carbon nanofibers (CNFs). The conductivity and large surface area of CNFs improved the electrochemical detection performance while providing more binding sites for chloramphenicol molecularly imprinted polymers. CNF@MIP was prepared using polypyrene as the functional monomer and chloramphenicol as the template molecule. The electrochemical performance of CNF@MIP was evaluated with cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Under optimized conditions, CNF@MIP exhibited a wide detection range (0.1–100 nM), low detection limit (1.15 pM), and good selectivity, stability, and reproducibility. In addition, CNF@MIP can be used to detect chloramphenicol in milk samples.
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