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The Creation of Nano-channels via Block Copolymers

The Creation of Nano-channels via Block Copolymers. Xuefa Li, Cayce Butler, Edward Hutchins Prof. Sol M. Gruner Prof. Christopher K. Ober Department of Physics Department of Materials Science and Engineering Cornell University. 1. 2. 3.

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The Creation of Nano-channels via Block Copolymers

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  1. The Creation of Nano-channels via Block Copolymers Xuefa Li, Cayce Butler, Edward Hutchins Prof. Sol M. Gruner Prof. Christopher K. Ober Department of Physics Department of Materials Science and Engineering Cornell University

  2. 1 2 3 Goal:To create 3-dimensional, uniform sized nano-channels in a large scale via block copolymer with labile block using a robust way. Potential Application: The nanoporous materials can be used for many exciting technologies because of its nano-scale size, periodic nature and large surface area. Exciting physical, electrical and magnetic properties may be obtained when microdots of metal, semiconductor or superconductor are deposited in these nano-channels. The Idea

  3. C H C H 3 3 b C H C H C H C C H C 2 2 2 m n x y C C H C H 3 C H C H 2 2 Chemical Structure of Interest Main Chain: poly(-methyl styrene)-b-poly(isoprene): (PMS-PI) The way toward our goal... Step 1: Create hexagonally packed cylindrical morphology by controlling the weight ratio of two blocks @1:3. Step 2: Crosslink the double-bonds in PI matrix phase by shining UV, in order to fix the morphology and avoid the collapse in next step. Step 3: Depolymerize poly(-methyl styrene) cylindrical phase via heating to create nano-channels in the polymer film.

  4. • SAXS is employed to probe the morphology, structural orientation and morphology development with temperature in the bulk of materials • The shearing device is built to orient the the bulk morphology into a specific direction in a controlled manner. SAXS Set-up and Shearing Device SAXS set-up Shearing Device

  5. •Cast film from toluene and then microtome. • Stain poly(isoprene) with OsO4 prior to TEM. • Darker phase is poly(isoprene) block, and lighter phase is poly(-methyl styrene) block. • Microdomain size ~360 Å 200nm 200nm TEM for PMS-PI: highly-ordered cylinders side-view top-view

  6.  Gruner Group  Ober Group Dr. Lew Fetters and Pamela Wright, Exxon  NSF  DOE  CCMR 200nm Acknowledgement •Cast film from toluene. • Shine UV first to crosslink poly(isoprene) matrix phase. • Heat the sample and depolymerize poly(-methyl styrene) cylindrical phase to create nano-pores. • Microtoming and no staining prior to TEM. • Nano-channel diameter ~100 Å. TEM of PMS-PI after Treatments: Nano-channels!

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