Functionalized single-walled carbon nanotubes (SWNTs) with amino groups were prepared by oxidation,
acylation, and amidation of SWNT surfaces. Epoxy/SWNT composite membranes were fabricated using a very low
content of amino-grafted SWNTs (≤0.08wt%) as fillers. SWNTs with amino groups acted as a curing agent, covalently
bonding to the epoxy matrix. The influence of SWNT content on the mechanical properties of
epoxy/amino-functionalized SWNT composite membrane was investigated. It is found that the tensile strength of
composites is enhanced with the increase of SWNTs. Only 0.01wt% of SWNT-R-NH2 leads to improvement of the
epoxy tensile strength by 9.5%, and 0.08wt% of SWNT-R-NH2 increased tensile strength by 13.6%. For comparison
purposes, epoxy/pristine-SWNT films were also prepared. The improvement of the tensile strength of the
amino-functionalized SWNTs system is more remarkable than that of pristine SWNT system at very low
weight-percentage loading. The amino groups on the surface of SWNTs can be covalently attached to the epoxy matrix,
which effectively improves the dispersion and adhesion of SWNTs in epoxy. This leads to the enhancement in
mechanical properties of the epoxy composite. Mechanical results between functionalized and pristine nanotubes are
discussed in detail.
Reinforced films based on sulfonated polystyrene cross-linked with water-soluble sulfonated carbon nanotubes were fabricated using a free-standing film-making method. Transmission and scanning
electron microscopy, X-ray photoelectron spectroscopy, and thermo-gravimetric analysis were used to verify the cross-linking reaction. The mechanical properties of these films demonstrated that the tensile
strength increases with an increase in the sulfonated nanotube concentration. At 5 wt% nanotube loading, the tensile strength increased 84% compared with polymer containing no nanotube loading. The relationships between structure and mechanical properties are discussed and a possible direction for making ultra thin and ultra lightweight film is proposed
In this paper, we report, for the first time, the effect of the lowered freezing point in a 50% water / 50% antifreeze
coolant (PAC) or 50% water / 50% ethylene glycol (EG) solution by the addition of carbon nanotubes and
other particles. The experimental results indicated that the nano materials are much more efficient (hundreds fold) in
lowering the freezing point than the regular ionic materials (e.g. NaCl). The possible explanation for this interesting
phenomenon is the colligative property of fluid and relative small size of nano material. It is quite certain that the
carbon nanotubes and metal oxide nano particles could be a wonderful candidate for the nano coolant application
because they could not only increase the thermal conductivity, but also efficiently lower the freezing point of
traditional coolants.
In this paper, we report the effort to prepare a stable and homogeneous heat transfer nanolubricant and nanogrease in the oils (e.g. DURASYN(R) 166) with the motivation of enhancing its properties such as thermal conductivity and lubricity. The process of making these fluids involves the dispersion of carbon nanoparticles into the oil through intermittent sonication and the use of additives such as surfactants. The rheology data indicats that the nanolubricant and nanogrease are non Newtonian fluids although the base DURASYN(R) 166 oil is Newtonian fluid. The good characteristic results of the carbon nanotube greases are also reported.
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