the morphology of laser-synthesized carbon nano-fillers: the influence on polymer-based composites
DESCRIPTION
The Morphology of Laser-Synthesized Carbon Nano-Fillers: the Influence on Polymer-Based Composites. Lavinia Gavrila-Florescu 1* , Ion Sandu 1 1 National Institute for Lasers, Plasma and Radiation Physics, P.O. Box MG-36, Bucharest, Romania - PowerPoint PPT PresentationTRANSCRIPT
A 10-a editie a Seminarului National de nanostiinta si nanotehnologie
18 mai 2011 Biblioteca Academiei Romane
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
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.
MOTIVATION
GENERAL FEATURES OF CARBON NANOPOWDER SYNTHESIZED BY LASER-INDUCED PYROLYSIS
Size depends on gas composition and experimental parameters (10-60 nm) Coalescence in bigger particles. Agglomeration occurs already in the flame.
Bending through the graphite nano-ribbons
MAIN CARBON POWDER MORPHOLOGIES
TURBOSTRATIC (C6H6/C2H4) TURBOSTRATIC (C2H2/SF6) Carbon nano-ribbons (C2H2/SF6) C/F=3 Fullerene-like (C6H6/C2H4/N2O)
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*
[X105cm]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
* sample’s density: 1.2 g/cm3
-0.10 -0.08 -0.06 -0.04 -0.02 0.00 0.02 0.04 0.06 0.08 0.10 0.12-100
-80
-60
-40
-20
0
20
40
60
80
100
I [A
]
U [V]
Ohmic behavior
0.5 1.0 1.5 2.0 2.5 3.01.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
cm
] x1
04
C/F
Resistance vs soot structure and morphology
0.5 1.0 1.5 2.0 2.5 3.0
1.8
2.0
2.2
2.4
2.6
2.8
3.0
C/F atomic ratio
1/d002
[nm-1]
La [nm]
1/d002 and La vs (C/F)at ratio
Resistivity vs carbon content
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.