The Morphology of Laser-Synthesized Carbon Nano-Fillers: the Influence on Polymer-Based Composites

1
The Morphology of Laser-Synthesized Carbon
Nano-Fillers the Influence on Polymer-Based
Composites
Lavinia Gavrila-Florescu1, Ion Sandu1 1National
Institute for Lasers, Plasma and Radiation
Physics, P.O. Box MG-36, Bucharest,
Romania IMT-Bucharest, 126A, Erou Iancu Nicolae
street, 077190, PO-BOX 38-160, 023573, Bucharest,
Romania
MOTIVATION
? Carbon nanoparticles are considered
high-potential filler materials for the
improvement of mechanical and physical polymer
properties ? the focus of the work was to drive
these materials into a regime where they can
favorably interact with the matrix.
GENERAL FEATURES OF CARBON NANOPOWDER SYNTHESIZED
BY LASER-INDUCED PYROLYSIS

• Coalescence in bigger particles. Agglomeration
  occurs already in the flame.
• Bending through the graphite nano-ribbons

• Size depends on gas composition and experimental
  parameters (10-60 nm)

MAIN CARBON POWDER MORPHOLOGIES
Fullerene-like (C6H6/C2H4/N2O)
Carbon nano-ribbons (C2H2/SF6) C/F3
TURBOSTRATIC (C2H2/SF6)
TURBOSTRATIC (C6H6/C2H4)
TESTS FOR POSSIBLE APPLICATIONS

• Laser induced pyrolysis ? morphologically
  different carbon nanopowders with specific
  chemical properties ?Experimental confirmation
  by their particular behavior during interaction
  with different chemical and biological systems ?
  Electrical conduction of polymer/carbon composite
  strongly influenced by electrical resistivity of
  filler

(C/F)at ratio sp2 bonded C Particle size nm La Å Resistivity X105?cm d002 Å
0.8 92.5 19 18.1 5.8 4.45
1.3 94.2 21 18.4 3.5 3.77
3 96.8 30 20.5 4.6 3.58
samples density 1.2 g/cm3
Ohmic behavior
Resistivity vs carbon content
1/d002 and La vs (C/F)at ratio
Resistance vs soot structure and morphology
CONCLUSIONS
? characteristics of the obtained nanocomposite
are affected by properties and dispersion of the
addition material ? the morphology of the carbon
nanopowder depends on both gas mixture and
experimental parameters ? optimal concentration
of the filler was around 2 (wt) ? better
results obtained by addition of laser-synthesized
carbon nanopowder ? the additional reinforcement
with carbon/glass fibers led to an important
enhancement of mechanic characteristics ? the
studies are in progress.
Acknowledgement Some of the results were
obtained in the frame of the Project
POSDRU/89/1.5/S/63700.