For decade, natural polymer, chitosan has been researched as a potential material for bioinspired agent, drug delivery and biosensor, on the basis of properties of biocompatible and biodegradable. We utilized chitosan in suspensions to become linear form under applied electric field, well-aligned linear structures of chitosan with increasing viscosity. The phenomena were caused by applied electric field which polarizes the particles and it changes polymer exterior into induced charge state. This charge produces dipoles of dispersed particles. The charges running on the surface in suspensions are the key role for forming linear type structure in the direction of field. Strengthening polarization of particles has been one of a major study and we figured out effect of deacetylation of chitosan, optimum degree of deacetylation (DD) also. Linearly assembled chitosan was prepared in the process of hydrolysis and T.P.S.-K titration method and then, modified chitosan was obtained in the order of chitosan DD 99.3%, DD 93.4%, DD 87.3%, DD 83.8% and DD 73.2%. FT-IR was used to confirm the synthesis of chitosan DD and amount of organic atoms in deacetylated chitosan was obtained by element analyzer. Morphology and size of materials were detected by FEG-SEM and optical microscopy was carried out to observe the phenomena of alignment of ER fluids. The electro rheological properties of suspensions under DC were investigated by physica couette-type rheometer with a high-voltage generator. Also, it was performed to observe a stable increase in shear stress against impact of heat because solidification or evaporation did not occur during the change of temperature.<br/><br/>Our study focused that phenomenon of the linearly assembled natural polymer which responds to an applied electric field and proposed optimum degree of deacetylation of chitosan. We also showed property of ER fluids in various temperatures. After further work, it will be regarded as a prospective resource for ER application such as human muscle stimulators besides it would be dampers, seismic controlling frame structure and so on.

Directly linear alignment as different deacetylation of chitosan under electric field

253rd National Meeting (2017)

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