RT Journal Article
T1 Single-walled carbon nanotubes and multiwalled carbon nanotubes functionalized with poly(L-lactic acid): 												A comparative study
A1 Olalde, Beatriz
A1 Aizpurua, Jesús M.
A1 García, Ainara
A1 Bustero, Izaskun
A1 Obieta, Isabel
A1 Jurado, María J.
AB Spectroscopic (Raman) and gravimetric (acid titration, TGA) techniques were compared to determine the functionalization degree of multiwalled carbon nanotubes (MWNTs) and single-walled carbon nanotubes (SWNTs) with poly(L-lactic acid) (PLLA), following a two-step oxidation/esterification process. After oxidation with HNO3, carbon nanotubes (CNTs) were activated with thionyl chloride to the corresponding acid chlorides and then grafted with PLLA. FTIR spectroscopy confirmed the formation of very similarly grafted CNT-PLLA materials for both SWNT and MWNT. But, according to chemical titration and TGA results, oxidized and esterified SWNT showed a significantly higher degree of functionalization than their MWNT counterparts. Contrary to these observations, the increase of the Raman ID/IG ratio was higher for MWNT-derived materials than for the SWNT counterparts. Therefore, it was concluded that this spectroscopic technique is unsuitable for the quantitative determination of the degree of functionalization when MWNT and SWNT are compared.
SN 1932-7447
YR 2008
FD 2008-07-24
LK https://hdl.handle.net/11556/3954
UL https://hdl.handle.net/11556/3954
LA eng
NO Olalde , B , Aizpurua , J M , García , A , Bustero , I , Obieta , I & Jurado , M J 2008 , ' Single-walled carbon nanotubes and multiwalled carbon nanotubes functionalized with poly(L-lactic acid) : A comparative study ' , Journal of Physical Chemistry C , vol. 112 , no. 29 , pp. 10663-10667 . https://doi.org/10.1021/jp800266j
DS TECNALIA Publications
RD 30 jul 2024