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Playing templates in nano/micro scales - block copolymers, algae, and proteins

 

SpeakerProf. Tomokazu Iyoda

Date: Wednesday, 16th March 2016

Time: 3:00-4:30 PM

Venue: 801 Main teaching building, Changping Campus

Sponsor: Beijing University of Chemical Technology Beijing Key Laboratory of Electrochemical Process and Technology for Materials

Abstract Block copolymers that consist of two or more polymer chains attached via a covalent bond are known to self-assemble into microphases with a variety of ordered morphologies, i.e. spherical, cylindrical, and lamellar structures. Microphaseseparated block copolymer films have received significant attention for their potential in nanotechnology applications, i.e., block copolymer lithography and templating processes. The films can spontaneously form ordered microdomains, tens of nanometers in size, with surface densities up to 1011 cm−2, and the microdomains possess inherent chemical and physical contrasts with the surrounding domains. A series of amphiphilic liquid crystalline diblock copolymers, PEOm-b-PMA(Az)n, consisting of hydrophilic poly(ethylene oxide) and hydrophobic poly(methacrylate) moieties with side chains containing liquid crystalline (LC) azobenzene moieties, produced highly ordered microphaseseparated films with PEO cylinders aligned perpendicular to the smectic LC layer of azobenzene in the PMA(Az) matrix. For templating processes using PEOm-bPMA(Az)n in its thin-film state, such a specific feature is of particular interest to systematically investigate the periodic property of nanomaterials fabricated using the PEOm-bPMA(Az)n thin film as a template. 

 
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