材料科学技术（英）
In this paper, radio frequency (r.f.) heating CVD technology for preparation of high performance fiber has been introduced. SiC, B fibers have been produced by this technology.
关键词:
Nanlin SHI
,
Kun LUO
,
Yapei ZU
,
Yading DUAN
材料科学技术（英）
In this paper, radio frequency (r.f.) heating CVD technology for preparation of high performance fiber has been introduced. SiC, B fibers have been produced by this technology.
关键词:
Plasma Chemistry and Plasma Processing
Silicone rubber samples were treated by CF(4) capacitively coupled plasma at radio frequency (RF) power of 60, 100 and 200 W for a treatment time up to 20 min under CF(4) flow rate of 20 sccm, respectively. Static contact angle, ATR-FTIR and XPS, and AFM were employed to characterize the changes of surface on hydrophobicity, functional groups, and topography. The results indicate the static contact angle is improved from 100.7 to 150.2, and the super-hydrophobic surface, which corresponds to a static contact angle of 150.2, appears at RF power of 200 W for a 5 min treatment time. It is suggested that the formation of super-hydrophobic surface is ascribed to the co-action of the increase of surface roughness created by the ablation reaction of CF(4) plasma and the formation of [-SiF (x) (CH(3))(2-x) -O-] (n) (x = 1, 2) structure produced by the direct attachment of F atoms to Si.
关键词:
Silicone rubber;Surface modification;CF(4) plasma;Hydrophobicity;XPS;outdoor insulators;improved adhesion;rough surfaces;gas plasma;fluorination;polymers;films;polydimethylsiloxane;hydrophobicity;polyethylene
Jianrong Xiao
材料科学技术（英）
Copper nitride (Cu3N) films were prepared by reactive radio frequency magnetron sputtering at various nitrogen partial pressures, and the films were annealed at different temperatures. The crystal structure of the films was identified by X-ray diffraction technique. The Cu3N films have a cubic anti-ReO3 structure, and lattice constant is 0.3855 nm. With increasing nitrogen partial pressure, the Cu3N films are strongly textured with the crystal direction [100]. The atomic force microscope images show that the films presence a smooth and compact morphology with nanocrystallites of about 70 nm in size. The films were further characterized by UV-visible spectrometer, and the optical band gap of the films was calculated from the Tauc equation. The typical value of optical band gap of the films is about 1.75 eV, and it increases with increasing nitrogen partial pressure. The thermal property of the films was measured by thermogravimetry, and the decomposition temperature of the films was about 530 K.
关键词:
Cu3N films
Journal of Central South University of Technology
In order to improve the surface hydrophobicity, silicone rubber (SIR) samples were exposed to CF(4) radio frequency (RF) capacitively coupled plasma (CCP). Attenuated total reflection Fourier transform infrared (ATR-FTIR) spectrum and X-ray photoelectron spectroscopy (XPS) were used to observe the variation of the functional groups of the modified SIR. Static contact angle (SCA) was employed to estimate the change of hydrophobicity of the modified SIR. The surface energy of SIR is reduced largely from 27.37 mJ/m(2) of original SIR sample to 2.94 mJ/m(2) of SIR sample treated by CF(4) CCP modification at RF power of 200 W for a treatment time of 5 min. According to the XPS, ATR-FTIR and surface energy analysis, it is suggested that the improvement of hydrophobicity on the modified SIR surface is mainly ascribed to the decrease of surface energy, which is caused by the cooperation of the fluosilicic structure of Si-F or Si-F(2) and the fluoric groups of C-CF(n) induced by the methyl replacement reaction and residual methyl groups of SIR surface.
关键词:
surface hydrophobicity;silicone rubber;radio frequency capacitively;coupled plasma;static contact angle;outdoor insulators;gas plasma;films;fluorination;coatings
Jianrong Xiao
材料科学技术（英）
Copper nitride (Cu3N) films were prepared by reactive radio frequency magnetron sputtering at various nitrogen partial pressures, and the films were annealed at different temperatures. The crystal structure of the films was identified by X-ray diffraction technique. The Cu3N films have a cubic anti-ReO3 structure, and lattice constant is 0.3855 nm. With increasing nitrogen partial pressure, the Cu3N films are strongly textured with the crystal direction [100]. The atomic force microscope images show that the films presence a smooth and compact morphology with nanocrystallites of about 70 nm in size. The films were further characterized by UV-visible spectrometer, and the optical band gap of the films was calculated from the Tauc equation. The typical value of optical band gap of the films is about 1.75 eV, and it increases with increasing nitrogen partial pressure. The thermal property of the films was measured by thermogravimetry, and the decomposition temperature of the films was about 530 K.
关键词:
Cu3N films
Applied Surface Science
For further prolonging the serve life of silicone rubber (SIR) for outdoor insulation and increasing its resistance of pollution flashover, surface modi. cations of SIR were carried out via CF(4) capacitively coupled plasma at radio frequency (RF) power of 60, 100 and 200 W for a treatment time up to 20 min under CF(4) flow rate of 20 sccm. Static contact angle measurement was employed to estimate the change of hydrophobicity of the modified SIR. The variation of the surface functional groups of the modified SIR was observed by attenuated total reflection Fourier transform infrared (ATR-FTIR) spectrum and X-ray photoelectron spectroscopy (XPS). The surface topography was observed by atom force microscopy (AFM). The results indicate that the static contact angle of SIR surface is improved from 100.7 degrees to 150.2 degrees via the CF(4) plasma modi. cation, and the super-hydrophobic surface of modified SIR, which corresponds to a static contact angle of 150.2 degrees, appears at RF power of 200 W for a 5-min treatment time. According to the results, it is suggested that the formation of super-hydrophobic surface is ascribed to the co-action of the increase of roughness created by the ablation reaction of CF(4) plasma and the formation of [SiF(x)(CH(3))(2) (x)-O-](n) (x = 1, 2) structure produced by the direct attachment of F atoms to Si. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.
关键词:
Silicone rubber;Super-hydrophobic;CF(4) plasma;XPS;AFM;improved adhesion;rough surfaces;hydrophobicity;polyethylene;fluorination;polymers;energy;films
