Fabrication and characterization of bioferroelectric composites

dc.contributor.advisor Suárez, O. Marcelo Declet-Vega, Amarilis College of Engineering en_US
dc.contributor.committee Quintero, Pedro
dc.contributor.committee Valentín, Ricky
dc.contributor.department Department of Mechanical Engineering en_US
dc.contributor.representative Lorenzo, Edgardo 2018-02-27T19:57:53Z 2018-02-27T19:57:53Z 2015
dc.description.abstract Bio-ferroelectric composites have recently sparked intensive research in order to develop inexpensive and environmental electronic devices such as capacitors, transistors, and actuators. The present research involves the synthesis of composites made of a chitosancellulose polymeric layer and ferroelectric nanoparticles. To fabricate the bio-ferroelectric composites, a chitosan/cellulose layer was synthesized followed by a layer containing ferroelectric nanoparticles. The variables considered includes the volume percentage of cellulose (15v% and 25v%) in the matrix and the amount of ferroelectric nanoparticles (10wt% and 20wt%). Additionally, the acetic acid concentration upon synthesis was studied due to its effects on the swelling degree of the composites. The composites underwent tensile, thermogravimetric and thermomechanical tests. Furthermore, dielectric properties were measured; including capacitance, dielectric constant, current density, and electrical resistivity. In order to analyze their sustainability for electronic applications, the composites were degraded under different acid solutions. The results showed that higher percentages of cellulose decreased the ultimate tensile strength (UTS) and the degradation temperature Tdeg of the chitosan-cellulose composites while the addition of cellulose slightly raised the UTS and Tdeg of the chitosan-cellulose composites with strontium titanate nanoparticles. Conversely, our results demonstrated that the acidity of the solution decreased the mentioned mechanical and thermal properties. The most interesting part consisted in the study of the dielectric properties; capacitors with higher dielectric constants were fabricated. Additionally, our capacitors are able to withstand higher voltages; the dielectric breakdown of the bioferroelectric composites at 60V was not observed. en_US
dc.description.graduationSemester Fall en_US
dc.description.graduationYear 2015 en_US
dc.description.sponsorship National Science Foundation, Grant HRD 0833112 (CREST program): Nanotechnology Center for Biomedical and Energy-Driven Systems and Applications and the Department of General Engineering en_US
dc.language.iso en en_US
dc.rights.holder (c) Amarilis Declet-Vega en_US
dc.rights.license All rights reserved en_US
dc.subject Bioferroelectric composites en_US
dc.subject.lcsh Nanocomposites (Materials) en_US
dc.subject.lcsh Capacitors. en_US
dc.subject.lcsh Dielectric devices. en_US
dc.subject.lcsh Thermogravimetry. en_US
dc.subject.lcsh Chitosan -- Synthesis. en_US
dc.subject.lcsh Cellulose -- Synthesis. en_US
dc.title Fabrication and characterization of bioferroelectric composites en_US
dc.type Thesis en_US
dspace.entity.type Publication Mechanical Engineering en_US M.S. en_US
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