The Creation of Nano-channels via Block Copolymers
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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

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

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


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.


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


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


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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