[BNC-all] BNC Distinguished Seminar Speaker (Miko Cakmak), Thursday 10/16, 4-5pm, Burton Morgan 121

[Shakouri, Ali]

Dear All,

I encourage you to attend Prof. Miko Cakmak's seminar tomorrow (Thursday) Oct. 16, 4-5pm in Burton Morgan 121. See below the abstract.
Prof. Cakmak is the Director of the Center for Multifunctional Polymer Nanomaterials and Devices at Univ. of Akron (one of the top programs in polymers in US). We are exploring potential collaborations opportunities in nanomanufacturing and Printing SMART films.

Best regards,
Ali




Field Assisted "Z" orientation of Nanophases to Produce Functional films using a Novel Roll to roll manufacturing   platform

Miko Cakmak,
Department of Polymer Engineering, University of Akron
Cakmak at uakron.edu<mailto:Cakmak at uakron.edu>

4-5pm Thursday Oct. 16, 2014
BURTON MORGAN 121

Abstract:
Electric1,2, Magnetic3, and Thermal gradient5,6 fields are three important methods used in Field Assisted Self Assembly (FASA) of polymer blends, block copolymers, liquid crystals and polymer nanocomposites. These assisted assembly techniques have been used in laboratory scale, but for potential applications such as flexible electronics7, membranes8, supercapacitors9, fuel cells10, photovoltaic's etc. a large scale manufacturing platform is needed. We introduce a novel roll to roll process developed in our laboratories to achieve "Z-direction" alignment of nanostructural units. A 70 ft line was designed which uses a casting system to deposit desired thickness of liquid such as a monomer and/or polymer solution up to 6" wide on a flexible substrate using a doctor blade system and flow coating system to deposit thin films. The substrate is then carried by pretensioned steel belt through an electric field application zone which consists of a parallel electrode sitting on top of the steel belt with the solution cast film passing below it. The electric field applied can be a DC, AC or a biased AC, hence using the various fields we can maximize the orientation by increasing the dielectric contrast between the particles and the matrix. If orientation and self-assembly through magnetic field is desired, the second tool located downstream is activated. This electromagnet is capable of applying magnetic fields up to 2.2 T to the material supported by a flexible substrate through the opposing poles. This line also contains a movable UV lamp which can be used to freeze the structure of required morphology using photocurable resin and could also be used to etch one phase of a polymer blend or block copolymer after electric field or magnetic field application zones. The final tool that is built on this machine is the Thermal Alignment zone. It is designed to apply a "line of heat" oriented transverse to the line direction at 9 different zones. In each zone the material may be subjected to a temperature gradient in the machine direction through a successive heating and cooling units. The temperature gradients can be created using conduction or radiation. Electric and magnetic field alignment of particles and polymer chains is studied through real time birefringence measurement, to determine various parameters effecting the orientation of particles/phases inside a polymeric film under the magnetic or electric field. The birefringence system is based on the solution drying process developed in our lab11.

References:
(1) Park, C.; Robertson, R. E. Materials Science and Engineering: A 1998, 257, 295-311.
(2) Kyrylyuk, A.; Zvelindovsky, A.; Sevink, G. Macromolecules 2002, 35, 1473-1476.
(3) Osuji, C.; Ferreira, P. J.; Mao, G.; Ober, C. K.; Vander Sande, J. B.; Thomas, E. L. Macromolecules 2004, 37, 9903-9908.
(4) Takahashi, T.; Murayama, T.; Higuchi, a; Awano, H.; Yonetake, K. Carbon 2006, 44, 1180-1188.
(5) Mita, K.; Tanaka, H.; Saijo, K.; Takenaka, M.; Hashimoto, T. Macromolecules 2008, 41, 6787-6792.
(6) Liu, C.-Y.; Bard, A. J. Chemistry of Materials 2000, 12, 2353-2362.
(7) Wong, W.  A. Salleo,Flexible Electronics: Materials and Applications ,2009. Springer
(8) Oren, Y.; Freger, V.; Linder, C. Journal of Membrane Science 2004, 239, 17-26.
(9) Park, B.; Im, K.-J.; Cho, K.; Kim, S. Organic Electronics 2008, 9, 878-882.
(10) Gasa, J. V.; Weiss, R. a.; Shaw, M. T. Journal of Membrane Science 2008, 320, 215-223.
(11)Unsal, E.; Drum, J.; Yucel, O.; Nugay, I. I.; Yalcin, B.; Cakmak, M. The Review of scientific instruments 2012, 83, 025114.


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