Photonic crystals in biology - NanoTR-VI

PPPR2R PIN(80)PPgPP OzlemPPoster Session, Thursday, June 17Theme F686 - N1123Synthesis and Characterization of Polyindole/TioR2R Nanocomposites111Bekir SahanP ErolPUH. Ibrahim UnalUP P*1PSmart Materials Research Lab. Department of Chemistry, University of Gazi, Ankara, TurkeyAbstract-Polyindole/TiOR2R nanocomposites are synthesized by in-situ polymerization using FeClR3R as an oxidizing agent in the presence ofsodium dodecybenzenesulfonate (Na-DBS) surfactant at two compositions with high yields. Characterizations of the polyindole (PIN) andpolyindole/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 manyyears for their independent electrical, optical, and mechanicalproperties. The combination of semiconducting andmechanical properties of conjugated polymers with theproperties of metals or semiconducting inorganic particleshas brought new prospects for wide application areas [1].One of the widely studied metal oxide is TiO R2R because of itsunique optical, electrical, chemical, high photocatalyticactivity, photoelectric conversion efficiency, electrokinetic,colloidal and electrorheological properties [2-3]. Among theclasses of inherently conductive polymers, PIN is muchinterested one due to its several advantages such as fairlygood thermal stability, electrochromic properties, high redoxactivity and stability [4]. Therefore, PIN has received asignificant amount of attention in the past several years andmay be a good candidate for applications in various areas,such as electronics, electrocatalysis, anode materials inbatteries, anticorrosion coatings and electrorheology. PINand its derivatives have been synthesized either by anTable 1. Some physical characteristics of the materials.CodingConductivity-(S cmP1 4)x10PMagneticsusceptibility(XRgR,cm1 7P)x10P-Density-3(g cmP P)PIN 1.03 21.27 0.94 21*PS-PIN 1.40 11.55 0.95 20TiOR2R(10)/PIN(90) 0.12 32.88 0.98 18TiOR2R(20)/PIN(80) 0.11 87.701.03 19*PS-TiOR2R(10)/PIN(90) 7.74 8.39 1.02 19*PS-TiO (20)/ 4.32 9.661.06 18*Where S denotes the presence of surfactant.Positive magnetic susceptibility values were indicatedthat conducting mechanism in the PIN and PIN/TiOR2Rnanocomposites were polaron in nature. The presence ofNa-DBS surfactant and increased percentage of TiOR2R wereobserved to slightly enhance the density of the materialssynthesized. It was observed that, the thermal stabilities ofthe PIN/TiOR2R nanocomposites were higher than PIN asexpected, which is an important parameter for industrialapplications such as vibration damping inelectrorheological fluids. Expected distinctive XRDpatterns of PIN/TiOR2R nanocomposites were identical tothose of TiOR2R nanoparticles reported in the literature, withan implication of deposited PIN on the surface of TiOR2Rparticles and had no effect on the degree of thecrystallinity of TiOR2R. SEM and TEM results revealed themorphologies of the materials and indicated thehomogeneous distribution of the components in the PINand PIN/TiOR2R nanocomposites. In conclusion, PIN/TiOR2Rnanocomposites were successfully synthesized, suitable forfurther zeta-potential measurements, electrorheologicalParticlesizes(μm)electrochemical, a chemical oxidative, emulsion, orinterfacial polymerization [5-6].In this study PIN/TiOR2R nanocomposites were synthesizedespecially to investigate their colloidal properties andelectrorheological activities in order to use as vibrationdamping material in shock absorbers in future studies. Forthis purpose, first PIN, then four types of PIN/TiOR2Rnanocomposites were synthesized without and with thepresence of 7%Na-DBS, and all the codings are given inTable 1. Elemental analysis results indicated that thenanocomposites were successfully prepared with desiredamounts of surfactant and composition. FTIR results showedthe expected distinctive absorptions belonging to both PIN,TiOR2R proofed the formation of both homopolymer andPIN/TiOR2R nanocomposites. Conductivities of the materialswere observed to increase with the inclusion of surfactantonto the PIN and PIN/TiOR2R nanocomposite surfaces(Table 1).(solidification of dispersions under the influence ofexternal electric field in milliseconds, repeatedly andreversibly) studies, creep-recovery tests and vibrationdamping experiments, which will be the second part of thisstudy.* 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