[Functional Genomics Center Seminar]
    
      
   ▶Subject: Applications of nanocellulose to advanced materials
   
   ▶Speaker: Sun-Young Lee, Ph.D. (Korea Forest Research Institute)
           
   ▶Date: 2:00PM/Jan./12(Mon)/2015
          
   ▶Place: Life Science Bldg. #104

   *Abctract
         Cellulose is one of the most abundant and renewable organic polymers from biomass in the biosphere. The properties of cellulose including good mechanical properties, low density and biodegradability have contributed to a rising interest in this material. Cellulose is the structural material of the fibrous cells with high levels of strength and stiffness per unit weight, and has a straight carbohydrate polymer chain consisting of ?-1-4 glucopyranose units and a degree of polymerization (DP) of about 10,000. Hydroxyl (?OH) groups in cellulose structures play a major role in governing the reactivity and physical property of
cellulose.
Nanocellulose is expected to show high stiffness since the Young’s modulus of the cellulose crystal is as high as 134 GPa. The tensile strength of the crystal structure was assessed to be approximately 0.8 up to 10 GPa. It is predicted that nanocellulose reinforcements in the polymer matrix may provide the value-added materials with superior performance and extensive applications for the next generation. In the world of science, nanotechnology is generally defined as the manipulation of materials in the range of 1 to 100 nm in at least one dimension.
Recently, we have successfully developed eco-friendly cellulose nanofiber paper-derived separator membranes (CNP separators) for use in lithium-ion batteries. In contrast to conventional papers comprising macro/microscopic cellulose fibers, a distinctive feature of the CNP separator is an electrolyte-philic, nanoscale labyrinth structure established between closely piled CNFs having the nanometer-scale diameter.
We also demonstrate a new class of heterolayered, one-dimensional (1D) nanobuilding block mat (h-nanomat) battery based on unitized separator/electrode assembly (SEA) architecture. The unitized SEAs consist of
wood cellulose nanofibril (CNF) separator membranes and metallic current collector-/polymeric binder-free electrodes comprising solely single-walled carbon nanotube (SWNT)-netted electrode active materials (LiFePO4 (cathode) and Li4Ti5O12 (anode) powders are chosen as model systems to explore the proof of concept for h-nanomat batteries).

   ▶Inquiry: Prof. Inhwan Hwang (279-2128)
         
     * This seminar will be given in English