Search results for "mwcnt"
showing 4 items of 4 documents
Kondensaation vaikutus hiilinanoputkidepositioon hydrofiilisellä piioksidipinnalla
2017
Tutkielmassa käsittelen kondensaatiota ja sen muodostumista hydrofiilisellä piioksidipinnalla olevaan moniseinäisten nanoputkien depositioon. Kondensaation depositioon muodostamia aukkoja analysoimalla pyritään saamaan kuva siitä miten kondensaatio vaikuttaa depositioon ja miten nanoputket vaikuttavat kondensaatioon. Näytteinä käytettiin happiplasmalla hydrofiiliseksi käsiteltyä piioksidisirua, johon tehtiin nanoputkidepositio pudottamalla nanoputkia sisältävää liuosta suurella nopeudella pyörivälle näytteelle. Näytteillä tehtiin kolmea erilaista koetta. Kontaktikokeissa pisara tuotiin kontaktiin näytteen kanssa, kondensaatiokokeissa pisara pidettiin näytepinnan läheisyydessä ja jäähdytysko…
Morphology and structure of electrospun CoFe2O4/multi-wall carbon nanotubes composite nanofibers
2010
CoFe2O4/multiwall carbon nanotubes (MWCNTs) composite nanofibers were produced by electrospinning a dispersion of MWCNTs in a solution of polyvinylpyrrolidone, iron(III) nitrate nonahydrate, cobalt (II) acetate tetrahydrate, absolute ethanol and H2O. Microstructure was examined by scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HR-TEM). Thermal behaviour was studied by thermogravimetry and differential thermal analysis (TG-DTA) and phase analysis of calcined fibers was performed by X-ray diffraction (XRD). Upon thermal treatment at 450 °C defect-free, randomly oriented composite fibers having a mean diameter of 60 ± 10 nm were obtained. The results s…
Straightforward preparation of highly loaded MWCNT-polyamine hybrids and their application in catalysis
2020
Multiwalled carbon nanotubes (MWCNTs) were easily and efficiently functionalised with highly cross-linked polyamines. The radical polymerisation of two bis-vinylimidazolium salts in the presence of pristine MWCNTs and azobisisobutyronitrile (AIBN) as a radical initiator led to the formation of materials with a high functionalisation degree. The subsequent treatment with sodium borohydride gave rise to the reduction of imidazolium moieties with the concomitant formation of secondary and tertiary amino groups. The obtained materials were characterised by thermogravimetric analysis (TGA), elemental analysis, solid state 13C-NMR, Fourier-transform infrared spectroscopy (FT-IR), transmission ele…
Grafting of polymer chains on the surface of carbon nanotubes via nitroxide radical coupling reaction
2016
Poly(butylene succinate)/MWCNTs nanocomposites with improved dispersion and with nanotubes embedded/immobilized into the polymer matrix were here prepared by an alternative "grafting to" method based on thenitroxide radical coupling reaction. Poly(butylene succinate) (PBS) was grafted on the surface of TEMPO (2,2,6,6-tetramethyl-1-piperidinyloxy) modified multi-walled carbon nanotubes (MWCNTs) via a nitroxide radical coupling reaction. TEMPO functionalized MWCNTs (MWCNTs-g-TEMPO) were synthesized using the Cu(I)-catalyzed azide/alkyne click chemistry approach and the covalent bond of the nitroxide moieties onto the MWCNTs was confirmed via electron paramagnetic resonance (EPR) spectroscopy.…