2 April 2008 Magnetic and electric field alignments of cellulose chains for electro-active paper actuator
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To improve the piezoelectricity of cellulose electro-active paper (EAPap), electrical field and magnetic field alignments were investigated. EAPap is made with cellulose by dissolving cotton pulp and regenerating cellulose with aligned cellulose fibers. EAPap made with cellulose has piezoelectric property due to its structural crystallinity. Noncentro-symmetric crystal structure of EAPap, which is mostly cellulose II, can exhibit piezoelectricity. However, EAPap has ordered crystal parts as well as disordered parts of cellulose. Thus, well alignment of cellulose chains in EAPap is important to improve its piezoelectricity. In this paper, uniaxial alignments of cellulose chains were investigated by applying electric field and magnetic field. As exposing different fields to EAPap samples, the changed characteristics were analyzed by X-Ray diffractometer (XRD) and Scanning electron microscopy (SEM). Finally, the piezoelectricity of EAPap samples was evaluated by comparing their piezoelectric charge constant [d31]. As increasing applied electric field up to 40V/mm, d31 value was gradually improved due to increased cellulose crystallinity as well as alignment of cellulose chains. Also the alignment of cellulose chains was improved with increasing the exposing time to magnetic field (5.3T) and well alignment was achieved by exposing EAPap sample on the magnetic field for 180min.
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Sungryul Yun, Sungryul Yun, Yi Chen, Yi Chen, Sang Woo Lee, Sang Woo Lee, Jaehwan Kim, Jaehwan Kim, Heung Soo Kim, Heung Soo Kim, } "Magnetic and electric field alignments of cellulose chains for electro-active paper actuator", Proc. SPIE 6929, Behavior and Mechanics of Multifunctional and Composite Materials 2008, 69290L (2 April 2008); doi: 10.1117/12.775951; https://doi.org/10.1117/12.775951

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