TY - JOUR
T1 - Surface characterization and London dispersive surface free energy of functionalized single-walled carbon nanotubes with a blend of polytetrafluoroethylene by inverse gas chromatography
AU - Basivi, Praveen Kumar
AU - Sreekanth, T. V.M.
AU - Sivalingam, Ramesh
AU - Thota, Chandrakalavathi
AU - Pasupuleti, Visweswara Rao
N1 - Publisher Copyright:
© 2019 John Wiley & Sons, Ltd.
PY - 2019/5
Y1 - 2019/5
N2 - The SWCNTs and SWCNT-polytetrafluoroethylene (PTFE) blend were prepared by using simple reaction mixture in the presence of chromosorb (SiO 2 ). Surface morphology of SWCNTs and (SWCNT-PTFE) blend was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermal gravimetric analysis (TGA), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and surface BET analysis. In addition, the surface thermodynamic properties of n-alkanes and polar probe net retention volumes are measured by inverse gas chromatography (IGC). The London dispersive surface free energy γ s L values were found to be decreased linearly with increase of temperature. The specific component of the surface free energy of adsorption ΔG a S for the polar probes was obtained using the Donnet-Park method. The surface character “S” value (K b /K a ) at SWCNTs was found to be 0.74, and SWCNT-PTFE blend surface character value was found to be 0.86. This result demonstrates that the (SWCNT-PTFE) blend surface contains relatively more acidic sites then that of SWCNT surface. Therefore, the IGC results provide useful complementary information on the (SWCNT-PTFE) blend surface.
AB - The SWCNTs and SWCNT-polytetrafluoroethylene (PTFE) blend were prepared by using simple reaction mixture in the presence of chromosorb (SiO 2 ). Surface morphology of SWCNTs and (SWCNT-PTFE) blend was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermal gravimetric analysis (TGA), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and surface BET analysis. In addition, the surface thermodynamic properties of n-alkanes and polar probe net retention volumes are measured by inverse gas chromatography (IGC). The London dispersive surface free energy γ s L values were found to be decreased linearly with increase of temperature. The specific component of the surface free energy of adsorption ΔG a S for the polar probes was obtained using the Donnet-Park method. The surface character “S” value (K b /K a ) at SWCNTs was found to be 0.74, and SWCNT-PTFE blend surface character value was found to be 0.86. This result demonstrates that the (SWCNT-PTFE) blend surface contains relatively more acidic sites then that of SWCNT surface. Therefore, the IGC results provide useful complementary information on the (SWCNT-PTFE) blend surface.
KW - inverse gas chromatography (IGC)
KW - polytetrafluoroethylene (PTFE)
KW - single-walled carbon nanotubes (SWCNTs)
KW - surface characterization
UR - http://www.scopus.com/inward/record.url?scp=85060522909&partnerID=8YFLogxK
U2 - 10.1002/sia.6612
DO - 10.1002/sia.6612
M3 - Article
AN - SCOPUS:85060522909
SN - 0142-2421
VL - 51
SP - 516
EP - 524
JO - Surface and Interface Analysis
JF - Surface and Interface Analysis
IS - 5
ER -