Third Day Poster Session, 17 June 2010 - NanoTR-VI

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Poster Session, Thursday, June 17
Theme F686 - N1123
Synthesis and Characterization of Polyindole/TioR2R Nanocomposites
1
1
1
Bekir SahanP ErolP
UH. Ibrahim UnalUP P*
1
PSmart Materials Research Lab. Department of Chemistry, University of Gazi, Ankara, Turkey
Abstract-Polyindole/TiOR2R nanocomposites are synthesized by in-situ polymerization using FeClR3R as an oxidizing agent in the presence of
sodium dodecybenzenesulfonate (Na-DBS) surfactant at two compositions with high yields. Characterizations of the polyindole (PIN) and
polyindole/TiOR2R nanocomposites were carried out by using various techniques namely: elemental analysis, FTIR, particle size, conductivity,
magnetic susceptibility, density, TGA, XRD, SEM and TEM measurements.
Polymer and metal oxides have been studied for many
years for their independent electrical, optical, and mechanical
properties. The combination of semiconducting and
mechanical properties of conjugated polymers with the
properties of metals or semiconducting inorganic particles
has brought new prospects for wide application areas [1].
One of the widely studied metal oxide is TiO R2R because of its
unique optical, electrical, chemical, high photocatalytic
activity, photoelectric conversion efficiency, electrokinetic,
colloidal and electrorheological properties [2-3]. Among the
classes of inherently conductive polymers, PIN is much
interested one due to its several advantages such as fairly
good thermal stability, electrochromic properties, high redox
activity and stability [4]. Therefore, PIN has received a
significant amount of attention in the past several years and
may be a good candidate for applications in various areas,
such as electronics, electrocatalysis, anode materials in
batteries, anticorrosion coatings and electrorheology. PIN
and its derivatives have been synthesized either by an
Table 1. Some physical characteristics of the materials.
Coding
Conductivity
-
(S cmP
1 4
)x10P
Magnetic
susceptibility
(XRgR,cm
1 7
P)x10P
-
Density
-3
(g cmP P)
PIN 1.03 21.27 0.94 21
*
PS-PIN 1.40 11.55 0.95 20
TiOR2R(10)/PIN(90) 0.12 32.88 0.98 18
TiOR2R(20)/PIN(80) 0.11 87.70
1.03 19
*
PS-TiOR2R(10)/PIN(90) 7.74 8.39 1.02 19
*
PS-TiO (20)/ 4.32 9.66
1.06 18
*Where S denotes the presence of surfactant.
Positive magnetic susceptibility values were indicated
that conducting mechanism in the PIN and PIN/TiOR2R
nanocomposites were polaron in nature. The presence of
Na-DBS surfactant and increased percentage of TiOR2R were
observed to slightly enhance the density of the materials
synthesized. It was observed that, the thermal stabilities of
the PIN/TiOR2R nanocomposites were higher than PIN as
expected, which is an important parameter for industrial
applications such as vibration damping in
electrorheological fluids. Expected distinctive XRD
patterns of PIN/TiOR2R nanocomposites were identical to
those of TiOR2R nanoparticles reported in the literature, with
an implication of deposited PIN on the surface of TiOR2R
particles and had no effect on the degree of the
crystallinity of TiOR2R. SEM and TEM results revealed the
morphologies of the materials and indicated the
homogeneous distribution of the components in the PIN
and PIN/TiOR2R nanocomposites. In conclusion, PIN/TiOR2R
nanocomposites were successfully synthesized, suitable for
further zeta-potential measurements, electrorheological
Particle
sizes
(μm)
electrochemical, a chemical oxidative, emulsion, or
interfacial polymerization [5-6].
In this study PIN/TiOR2R nanocomposites were synthesized
especially to investigate their colloidal properties and
electrorheological activities in order to use as vibration
damping material in shock absorbers in future studies. For
this purpose, first PIN, then four types of PIN/TiOR2R
nanocomposites were synthesized without and with the
presence of 7%Na-DBS, and all the codings are given in
Table 1. Elemental analysis results indicated that the
nanocomposites were successfully prepared with desired
amounts of surfactant and composition. FTIR results showed
the expected distinctive absorptions belonging to both PIN,
TiOR2R proofed the formation of both homopolymer and
PIN/TiOR2R nanocomposites. Conductivities of the materials
were observed to increase with the inclusion of surfactant
onto the PIN and PIN/TiOR2R nanocomposite surfaces
(Table 1).
(solidification of dispersions under the influence of
external electric field in milliseconds, repeatedly and
reversibly) studies, creep-recovery tests and vibration
damping experiments, which will be the second part of this
study.
* HTCorrespondingTH author: hiunal@gazi.edu.tr
[1] Q.-T. Vu, M. Pavlik, N. Hebestreit, J. Pfleger, U. Rammelt,
W. Plieth, Electrochim. Acta 51, 1117 (2005).
[2] Q.-T. Vu, M. Pavlik, N. Hebestreit, U. Rammelt, React.
Funct. Polym. 65, 69 (2005).
[3] J.J.M. Halls, K. Pichler, R.H. Friend, S.C. Moratti, A.B.
Holmes, Appl. Phys. Lett. 68, 3120 (1996).
[4] G. Nie, X. Han, J. Hou, and S. Zhang, J. Electroanal. Chem.
604, 125 (2007).
[5] Z. Cai, M. Geng, and Z. Tang, J. Mater. Sci. 39, 4001 (2004).
[6] H. Talbi, B. Humbert, and D. Billaud, Synth. Met. 84, 875
(1997).
6th Nanoscience and Nanotechnology Conference, zmir, 2010 718