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Wenbao Chen,Xuyan Liu,Yangshuo Liu,방영길,김형일 한국고분자학회 2011 Macromolecular Research Vol.19 No.1
Silica/polypyrrole hybrid nanoparticles were synthesized by microemulsion polymerization using a vapor monomer feeding system. In contrast to the traditional monomer feeding methods of microemulsion polymerization,this study examined the monomer feeding as a vapor phase. The silica modified with 3-(trimethoxysilyl)propyl methacrylate had a hydrophobic surface was used as template. Polymerization of the pyrrole monomers occurred at the surface of the modified silica. By controlling the vapor feeding speed, the pyrrole monomer could be dispersed in the reaction system quite well. The modification of silica and the formation of silica/polypyrrole nanoparticles were characterized by Fourier transform infrared spectroscopy and thermogravimetric analysis. The silica/polypyrrole hybrid morphology was confirmed by transmission electron microscopy and scanning electron microscopy. Through a comparison with the nanoparticles made by traditional microemulsion polymerization, uniform and smaller nanoparticles of the silica/polypyrrole hybrid nanocomposite were prepared using a lower surfactant content. The size of the silica/polypyrrole nanocomposites decreased with increasing surfactant content and decreasing pyrrole monomer content.
Preparation of O/W Pickering emulsion with oxygen plasma treated carbon nanotubes as surfactants
Wenbao Chen,김형일,Xuyan Liu,Yangshuo Liu,Youngkil Bang 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.3
The stable oil-in-water Pickering emulsions were prepared using oxygen plasma treated carbon nanotubes (CNTs) as stabilizers. Some hydrophilic groups such as hydroxyl and carboxyl groups were introduced on the surface of the CNTs by plasma treatment. The plasma treated CNTs showed the improvement in dispersion stability in water as well as cyclohexane for a long time. The Raman spectra showed that the original properties of CNTs were retained after the plasma treatment differently from other chemical modification methods. The plasma treated CNTs had a favorable interfacial interaction with water to form the stable O/W Pickering emulsions. The formation of stable O/W Pickering emulsion was dependent on the CNT concentration, the plasma treatment period, and the sonication time.
A Multi-dimensional Evidence-based Trust Evaluation Model and Algorithm
Wenbao Jiang,Qijing Li,Wenliang Chen 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.5
Trust evaluation is increasingly important for collaboration in the Internet today. We propose a multi-dimensional evidence-Based trust evaluation model named EBTrust model, which expands the types and sources of evidence. We put both transaction feedback and the network operating behavior information into this model. And we improve the D-S evidence theory and propose a new rule of evidence synthesis that based on the conflict intensity (G) and efficient conflict (Gh), so we call it G-Gh synthesis rule, which can not only solve the high confliction and complete conflict feature of multi-dimensional evidences but also the problem of uncertainty in the process of trust evaluation. The example analysis and experimental results show that the EBTrust model can resist conspiracy and malicious comment behavior.