耐克在天猫哪家是正品:有会翻译化学的吗

Transmission electron microscopy (TEM) was used to
identify and characterize carbon nanotubes. Specimens for
TEM observation were prepared by ultra-sonicating carbon
nanotubes in alcohol, then dipping a TEM sample grid into
the dispersion. Nitrogen adsorption isotherms of nanotube
samples were measured at 77.5 K by an ASAP 2010
volumetric sorption analyzer (Micromeritics) with addi-
tional options for the micropore analysis. The volume of
adsorbed nitrogen at 77.5 K was measured as a function of
25 the equilibrium pressure over a range from 10 Torr to
the saturation vapor pressure. Prior to adsorption measure-
ments, samples were outgassed under vacuum at 573 K for
3 h. The pore size distributions (PSD) of samples were
obtained by analyzing the isotherm with BJH equation. To
check any significant chemical modification, the raw and conpurified
sample was analyzed by X-ray photoelectron
spectroscopy (XPS), respectively. Photoelectron spectra of
samples were measured using a PHI5300 X-ray photoelec-
tron spectrometer (PE Corp.) with Al Ka source. The
spectra were recorded at room temperature under high
vacuum. All binding energies (BE) were corrected for
sample charging using the BE of C as an external 1s
standard (284.6 eV). All data were analyzed with the aid of
an Applle Series 3500. Thermo-gravimetric analysis
(TGA) was used to determine the content of the Fe catalyst
in the sample, and a CAHN2000 thermo-gravimetric
analyzer was used to characterize weight loss during
oxidation of the samples in air with heating to 11008C at a
rate of 108C/min.