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- 저자 : Yangqiao Liu (검색결과 3 건)
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Functionalization of carbon naotubes for nanoparticle attachment
Lian Gao,Yangqiao Liu,Jing Sun,Yan Wang 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.1
In this paper, multiwalled carbon nanotubes (MWNTs) have been functionalized by two methods, which are a concentrated acid treatment and a noncovalent treatment by a polyelectrolyte. The structure of the carbon nanotubes after treatment has been characterized by Raman measurements. Zeta potential analysis shows that the carbon nanotubes become obviously negatively charged after these two treatments. Inorganic nanoparticles, including NiFe2O4, CdS and SnO2 are homogeneously attached onto the functionalized MWCNTs using an in situ formation method utilizing the electrical attraction between the functionalized MWCNTs and the metal ions. The composites obtained have been characterized by transmission electron microscopy (TEM) and energy dispersive spectroscopic (EDS) analysis. These composites can be potentially useful for fabricating catalysts, photovoltaic cells, lightemitting diodes, etc..
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Synthesis and characterization of FePt nanoparticle/ multi walled carbon nanotube composites
Yan Wang,Lian Gao,Jing Sun,Yangqiao Liu 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.1
This paper reports the synthesis of FePt nanoparticle (NPs)/multi walled carbon nanotube (FePt/MWNTs) nanocomposites,which have important potential implications to orient CNTs and the development of catalysts. FePt NPs have been synthesized by a chemical method, whose crystallite size is about 2.5-4 nm with a Fe content ranging from 50 to 65. MWNTs produced by chemical vapor deposition have been decorated with FePt nanoparticles under mild conditions without any pretreatment. When the diameter of MWNTs is about 20-30 nm, FePt NPs mostly attach onto the sidewalls of MWNTs. The amount of FePt NPs attached onto the MWNTs can be well controlled. Transmission electron microscope (TEM), high-resolution transmission electron micrograph (HRTEM) studies, and energy dispersive X-ray spectroscopy (EDS) spectra were performed to observe the nanostructure of these nanocomposites. The orientation in these nanocomposites has been studied initially.
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Preparation and Properties of Cellulose Nanocrystals Based Self-healing Polyurethane
Yang Qiao,Qi Xu,Shouxiang Liu,Zhiqiang Li,Yanyan Wei 한국고분자학회 2023 폴리머 Vol.47 No.3
First, cellulose nanocrystals were extracted from microcrystalline cellulose using the sulfuric acid hydrothermal method. Second, imine aromatic diol (Imine) was synthesized from p-hydroxybenzaldehyde and 4,4'-diaminodiphenylmethane as raw materials. Then the imine was introduced into the polyurethane, and the reversible covalent bond between the imine and the C = N group was used to endow the polyurethane with self-healing properties. Finally, cellulose nanocrystalline (CNC) was added into the self-healing polyurethane as the dispersed phase to prepare the composite. The experimental results show that with the increase of the amount of CNC, the properties of the composites increase first and then decrease, which is due to the physical cross-linking effect of proper CNC distribution in the self-healing polyurethane, it is beneficial to the mechanical properties, but the self-healing property is reduced by further increasing the content, which restricts the movement of the molecular chain. The mechanical properties of the composite with 0.049 g CNC are the best, with fracture strength reaching 20.59 MPa, approximately 1.56 times higher than that of pure self-healing polyurethane, and its elongation at break is 979%, and the self-healing efficiency reaches 84.7%, keeping an excellent level.
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