{"640600":{"#nid":"640600","#data":{"type":"event","title":"PhD Proposal by Kellina J. Pierce","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003ETHE SCHOOL OF MATERIALS SCIENCE AND ENGINEERING\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EGEORGIA INSTITUTE OF TECHNOLOGY\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EUnder the provisions of the regulations for the degree\u003C\/strong\u003E\u003Cbr \/\u003E\r\n\u003Cbr \/\u003E\r\n\u003Cstrong\u003EDOCTOR OF PHILOSOPHY\u003C\/strong\u003E\u003Cbr \/\u003E\r\n\u003Cbr \/\u003E\r\n\u003Cstrong\u003Eon Wednesday, November 4, 2020\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E10:00 AM\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003Evia\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EBlueJeans Video Conferencing\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Ca href=\u0022https:\/\/bluejeans.com\/958979519\u0022\u003Ehttps:\/\/bluejeans.com\/958979519\u003C\/a\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003Ewill be held the\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EDISSERTATION PROPOSAL DEFENSE\u003C\/strong\u003E\u003Cbr \/\u003E\r\n\u003Cbr \/\u003E\r\n\u003Cstrong\u003Efor\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EKellina J. Pierce\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026quot;Confinement and External Fields Effects on Cellulose Nanocrystals\u0026rsquo; Lyotropic Liquid Crystal Behavior\u0026rdquo;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003ECommittee Members\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Ca name=\u0022_Hlk54306819\u0022\u003E\u003Cstrong\u003EProf. Vladimir V. Tsurkuk, Advisor, MSE\u003C\/strong\u003E\u003C\/a\u003E\u003Ca name=\u0022_Hlk53967710\u0022\u003E\u003Cbr \/\u003E\r\n\u003Cstrong\u003EProf. Alberto Fern\u0026aacute;ndez-Nieves, PHYS\u003Cbr \/\u003E\r\nProf. Karl Jacob, MSE\u003Cbr \/\u003E\r\nProf. Meisha Shofner, MSE\u003Cbr \/\u003E\r\nMike McConney, Ph.D., Air Force Research Lab\u003C\/strong\u003E\u003C\/a\u003E\u003Cbr \/\u003E\r\n\u003Cstrong\u003EDhriti Nepal, Ph.D., Air Force Research Lab\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EAbstract:\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EBioderived materials such as cellulose nanocrystals (CNCs) have inherent structural organization that can be exploited for the control of dimensionality, periodicity, and functionality of biocompatible and photonic appropriate materials. However, precise control and tunablility of organized cellulose nanocrystal-based materials is challenging due to the random organization of the chiral nematic structure, called tactoids, during evaporation induced self-assembly (EISA) of solid films. The proposed research aims to control the lyotropic liquid crystal (LC) alignment of CNCs by (i) utilizing geometric confinement for asymmetric evaporation that induces directional flow, (ii) direct chemical modification of the surface groups for control of inter-particle interactions, and (iii) applying magnetic and\/ or electric fields for uniform and patterned orientation. The main hypothesis of the proposed research is that the chiral nematic structure of CNC materials can be used as a foundation for selective complex structure formation beyond traditional polydomain-like materials with poorly-defined iridescence and polarization.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EThe first task intends to utilize capillary conferment and chemical modification of the CNCs to induce uniform alignment of the lyotropic liquid crystal phase. Sulfate esterification of the CNCs with a pyrogallol and the addition of a covalent bond stabilizer will improve the films\u0026rsquo; durability under confinement and provide insight on the limitations of directed evaporation of CNC films. The second task will employ magnetic nanoparticles and weak magnetic fields to selectively pattern cellulose films via localized changes in their helical organization. Magnetic nanoparticles will be used to increase the magnetic susceptibility of CNC suspensions for direct precision patterning in the films. Lastly, the third task will make use of electric fields to investigate dynamic changes in the CNCs\u0026rsquo; lyotropic liquid crystal phase in liquid and hydrogel materials to ultimately fabricate a solid state material with controlled, frozen helicoidal organization. Due to the disturbance of the hydrogen-bonding network of water when subjected to electric fields, thorough investigation of chemically modified CNCs in nonaqueous solvents will be particularly instrumental for this task to induce reversible pattern formation via electric field stimulation.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EAchieving these goals will offer fundamental insight to strengthen CNC materials\u0026rsquo; uniformity and their liquid crystal behavior and the resulting flexible, organized films with LC phase-derived organization. As such, this will be the groundwork to define uses for responsive and tunable biopolymer systems to design ordered chiral nanocomposites. This work will advance dynamic control over cellulose nanocrystal films and widen the breath of multi-stimuli responsive, biocompatible hydrogels for biosensors and tunable optical reflectors.\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Confinement and External Fields Effects on Cellulose Nanocrystals\u2019 Lyotropic Liquid Crystal Behavior"}],"uid":"27707","created_gmt":"2020-10-26 18:14:19","changed_gmt":"2020-10-26 18:14:19","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2020-11-04T10:00:00-05:00","event_time_end":"2020-11-04T14:00:00-05:00","event_time_end_last":"2020-11-04T14:00:00-05:00","gmt_time_start":"2020-11-04 15:00:00","gmt_time_end":"2020-11-04 19:00:00","gmt_time_end_last":"2020-11-04 19:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"102851","name":"Phd proposal"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"78771","name":"Public"},{"id":"174045","name":"Graduate students"},{"id":"78751","name":"Undergraduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}