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Li M.,University of Science and Technology of China | Li M.,Shandong Prov Key Laboratory Of Processing And Testing Technology Of Glass And Functional Ceramics | Li M.,University of Jinan | Yang L.,University of Science and Technology of China | Zhang Y.,University of Science and Technology of China
RSC Advances | Year: 2015

A hollow thorn-like polypyrrole (PPy) microtube structure (HTPMT) has been prepared by in situ chemical oxidation polymerization using Methyl Orange (MO) and sodium dodecylbenzene sulfonate (SDBS) as double soft templates, in which the MO and SDBS performed both as surfactant and dopant. The hierarchical structure of HTPMT formed in the presence of MO and SDBS was different from that of polypyrrole microtubes (PMT) or nanoparticles (PNP) using MO and SDBS separately. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images showed that the morphology of the HTPMT had the appearance of thorns growing on the surface of the PMT. The TEM images of the MO and SDBS solutions revealed that PPy had polymerized on the surface of the end-closed MO tubes and in the vesicular SDBS micelles. Electrostatic attraction between the anionic SDBS micelles and cationic pyrrole radicals during the polymerization assisted the formation of the HTPMT. The HTPMT exhibited improved electrochemical performance and thermal stability compared with PMT or PNP, illustrating that the morphology and structure of the conductive polymer influenced the electrochemical performance of the electrode materials. This journal is © The Royal Society of Chemistry 2015. Source


Li M.,Shandong Polytechnic University | Li M.,Shandong Prov Key Laboratory Of Processing And Testing Technology Of Glass And Functional Ceramics | Li W.,Shandong Polytechnic University | Liu J.,Shandong Polytechnic University | And 2 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2013

PPy nanotubes were succesfully synthsized in neutral MO aqueous solutions by in situ polymerization using FeCl3 or APS as oxidant respectively. These nanotubes were characterized with SEM, TEM, FTIR XRD and EDS and results showed MO molecules entered into the PPy chain as dopant. The good conducting characteristic may be related to the higher doping level of the MO and conductivity of the PPy nanotubes was up to 29.07 S·cm-1. The shape of the obtained PPy would be changed slightly and its solubility was greatly improved because of the addition of HCl in neutral MO aqueous solutions. © 2012 Springer Science+Business Media, LLC. Source


Zhang Y.,Shandong University of Technology | Li M.,Shandong University of Technology | Li M.,Shandong Prov Key Laboratory Of Processing And Testing Technology Of Glass And Functional Ceramics | Li M.,University of Jinan | And 6 more authors.
Journal of Solid State Electrochemistry | Year: 2014

The layered polypyrrole-graphene oxide-sodium dodecylbenzene sulfonate (PPyGO-SDBS) nanocomposites were facilely fabricated via an in situ emulsion polymerization method with the assistance of SDBS as dopant and stabilizer. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and electrochemical performance were employed to analyze the structure and the characteristics of the composites. The results showed that SDBS played an important role in improving the electrochemical performance of the PPyGO-SDBS, by dispersing the PPy between the layers of the GO. The obtained PPyGO-SDBS exhibited remarkable performance as an electrode material for supercapacitors, with a specific capacitance as high as 483 F g-1 at a current density of 0.2 A g-1 when the mass ratio of pyrrole to GO was 80:20. The attenuation of the specific capacitance was less than 20 % after 1,000 charge-discharge processes, supporting the idea that PPy inserted successfully into the GO interlayers. The excellent electrochemical performance seemed to arise from the synergistic effect between the PPy and the GO and the dispersion of the PPy induced by SDBS. © 2014 Springer-Verlag Berlin Heidelberg. Source


Li M.,Shandong Polytechnic University | Li M.,Shandong Prov Key Laboratory Of Processing And Testing Technology Of Glass And Functional Ceramics | Li W.,Shandong Polytechnic University | Liu J.,Shandong Polytechnic University | And 2 more authors.
Polymer Engineering and Science | Year: 2013

Polypyrrole (PPy) was successfully prepared by chemical oxidation in various anionic surfactant solvents and an interesting regulation of the molar ratio of the oxidant and the monomer was firstly discovered which was closely related to the conductivity of the PPy when the molar ratio of the anionic surfactant to the monomer was 0.3. The value of conductivity reached its maximum when the molar ratio of the oxidant and the monomer was 1.1. A series of testing results including scanning electron microscopy, elemental analysis, Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Four-Point Probes Resistivity Measurement System showed that the morphology and conducting characteristic of obtained PPy were greatly influenced by the anionic surfactant. The doping level and the degree of the structural order of counterions in the polymer chains influence the conductivity of the obtained doped PPy. © 2013 Society of Plastics Engineers. Source


Chang X.,Shandong University of Technology | Li M.,Shandong University of Technology | Li M.,Shandong Prov Key Laboratory Of Processing And Testing Technology Of Glass And Functional Ceramics | Li M.,University of Jinan | And 4 more authors.
RSC Advances | Year: 2016

A novel adsorbent of phenol-formaldehyde resin (PF) microspheres was prepared at a low temperature, and had an excellent performance for the adsorption-reduction of Cr(vi). The microspheres were characterized by transmission electron microscope (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and energy dispersive spectrometer (EDS). The effects of contact time, pH value and initial concentration, adsorbent dosage and temperature were studied by batch mode. The results showed that the adsorption process fitted a pseudo-second-order model and a Langmuir isotherm model very well, and an intra-particle diffusion model gave three stages in the whole process. Thermodynamic constant values (ΔH° > 0, ΔS° > 0, ΔG° < 0) indicated that the adsorption process was endothermic and spontaneous. The maximum adsorption capacity of Cr(vi) on the adsorbent reached 280.9 mg g-1 at 303 K. The PF microspheres could be applied to Cr(vi)-water treatment with the reduction and adsorption of the heavy metal ion. © The Royal Society of Chemistry 2016. Source

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