The article reports the results on the development of highly optimized two-factor mechanical method of dispersion of multiwalled carbon nanotubes (MWCNTs) in polymer matrixes with the aim of preparing of nanocomposite...The article reports the results on the development of highly optimized two-factor mechanical method of dispersion of multiwalled carbon nanotubes (MWCNTs) in polymer matrixes with the aim of preparing of nanocomposites. The investigation of the MWCNTs and nanocomposites was carried out by using scanning electron microscopy, X-ray diffraction and Raman spectroscopy. The effectiveness of the developed method is demonstrated by comparing the electrical conductivity of MWCNT/polymer nanocomposites prepared on the basis of polydimethylsiloxane (PDMS) and the epoxy resin, using two methods-the known chemical and the proposed one-two-factor mechanical.展开更多
Distillate fractions of Azerbaijan’s oil-gasoline, jet fuel and diesel were tested as a raw material for producing carbon nanotubes. Aerosol CVD technique was employed at atmospheric and low pressures and ferrocene w...Distillate fractions of Azerbaijan’s oil-gasoline, jet fuel and diesel were tested as a raw material for producing carbon nanotubes. Aerosol CVD technique was employed at atmospheric and low pressures and ferrocene was used as a catalyst. It is shown that at atmospheric pressures carbon nanotubes were formed only from a gasoline fraction. Lower pressure in the reactor during the synthesis process leads to formation of carbon tubular structure from both petroleum fractions-gasoline and jet fuel. Other modifications of carbon were grown at atmospheric pressure in a case used fraction jet fuel and diesel fraction. MWCNTs with diameters of 35 - 65 nm have been grown at lower pressure in the reactor using gasoline fraction. The diameter of the MWNTs grown at atmospheric pressure in the reactor was in the range of 80 - 215 nm and the length reached 6 microns after the purification process.展开更多
Carbon nanotubes flower (CNTs-F) films were prepared by catalytic chemical vapor deposition (CVD) on a platinum (Pt) thin layer, supported on a silicon wafer. The products were synthesized from an aerosol composed of ...Carbon nanotubes flower (CNTs-F) films were prepared by catalytic chemical vapor deposition (CVD) on a platinum (Pt) thin layer, supported on a silicon wafer. The products were synthesized from an aerosol composed of ferrocene and toluene, as catalyst and carbon precursor respectively, at 820. The high synthesis temperature induces a modification of a Pt thin layer to a nano-structured island giving rise to the formation of CNTs-F during the following films growth step by CVD process. The suggested mechanism involves the selective diffusion of the catalyst and carbon atoms through the Pt grain boundaries. This results in the appearance of flower-like structures with 3-and 4-fold symmetries.展开更多
文摘The article reports the results on the development of highly optimized two-factor mechanical method of dispersion of multiwalled carbon nanotubes (MWCNTs) in polymer matrixes with the aim of preparing of nanocomposites. The investigation of the MWCNTs and nanocomposites was carried out by using scanning electron microscopy, X-ray diffraction and Raman spectroscopy. The effectiveness of the developed method is demonstrated by comparing the electrical conductivity of MWCNT/polymer nanocomposites prepared on the basis of polydimethylsiloxane (PDMS) and the epoxy resin, using two methods-the known chemical and the proposed one-two-factor mechanical.
文摘Distillate fractions of Azerbaijan’s oil-gasoline, jet fuel and diesel were tested as a raw material for producing carbon nanotubes. Aerosol CVD technique was employed at atmospheric and low pressures and ferrocene was used as a catalyst. It is shown that at atmospheric pressures carbon nanotubes were formed only from a gasoline fraction. Lower pressure in the reactor during the synthesis process leads to formation of carbon tubular structure from both petroleum fractions-gasoline and jet fuel. Other modifications of carbon were grown at atmospheric pressure in a case used fraction jet fuel and diesel fraction. MWCNTs with diameters of 35 - 65 nm have been grown at lower pressure in the reactor using gasoline fraction. The diameter of the MWNTs grown at atmospheric pressure in the reactor was in the range of 80 - 215 nm and the length reached 6 microns after the purification process.
基金the Conseil Regional of PACA,the Conseil Général du Var,and Toulon Provence Mediterranean for their financial support.
文摘Carbon nanotubes flower (CNTs-F) films were prepared by catalytic chemical vapor deposition (CVD) on a platinum (Pt) thin layer, supported on a silicon wafer. The products were synthesized from an aerosol composed of ferrocene and toluene, as catalyst and carbon precursor respectively, at 820. The high synthesis temperature induces a modification of a Pt thin layer to a nano-structured island giving rise to the formation of CNTs-F during the following films growth step by CVD process. The suggested mechanism involves the selective diffusion of the catalyst and carbon atoms through the Pt grain boundaries. This results in the appearance of flower-like structures with 3-and 4-fold symmetries.
