Block Copolymers (BCPs) in thin films. Phenomena : Block copolymer (BCPs) in thin films with. long range lateral order ,. self-assembly. and so on…. Block Copolymers (BCPs) in thin films. Physics : We consider aspects of. segmental interactions ,.
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Block copolymer (BCPs) in thin films with
long range lateral order,
and so on….
We consider aspects of
We consider aspects of
Mean Field theory!!!
Frank S.Bates, Annu.Rev.Phys.Chem.1990.41.525-57
P.F.Green, R.Limary,Advances in Clloid and Interface Science 94,53 (2001)
1.2 Surface Energy
A—higher interfacial energy with the interface as it increases its fraction;
B---lower interfacial energy with interface as it decrease its fraction.
Commensurability----On one hand, the total energy is lowest; on the other, the amount of each component is fixed. Together they determine the copolymer structures.
1.3 Heterogeneous Surfaces
The strength and lateral distribution of interfacial interactions can direct the BCP morphologies in thin films.
J.Heier, et.al. Macromolecules, 30, 6610 (1997)
Perfect candidates as templates and scaffolds for the fabrication of nanostructured materials.
Top down approaches are coupled with a bottom up approach, to obtain multi length scales control over the ordering and spatial location of nanoscopic elements for device fabrication.
2.1 zone casting
A.Tracz, et. al. Journal of the American Chemical Society 125, 1682 (2003)
2.2 Solvent Annealing
The preparation of BCP thin films under various solvent evaporation conditions is an effective way to manipulate the orientation and lateral ordering of BCP microdomains in thin films.
S.H.Kim, et.al. Advanced Materials 16, 226 (2004)
2.3 Optical Alignment
Directionally selective light excitation, using linearly polarized light of photoisomerizable molecules in a liquid-crystalline polymer produced patterned, oriented microdomains in the films.
K.Ichimura, Chemical Reviews 100, 1847 (2000)
BCPs in bulk can easily be aligned by mechanical shear.
D.E.Angelescu, et.al. Advanced Materials 16, 1736 (2004)
3.1 Nanoporous Membrane for Filtration of Viruses
S.Y.Yang, et. al. Advanced Materials 18, 709 (2006)
3.2 Incorporation of Nanocrystals and Nanoreactors
Nice little workshop for nanoparticles.
3.3 Planar Optical Waveguides
A. Schematic diagram of the OWS setup based on the Kretschmann configuration, and of the idealized field distribution of several guided modes in the waveguiding layer.
B. Schematic diagram of a thin film of PS-b-PMMA/PMMA homopolymer mixture with PMMA microdomains aligned normal to the substrate.
D.H.Kim, et. al. Advanced Materials 17,2442 (2005)
3.4 Templated Growth of Nanowires
A. An asymmetric diblock copolymer annealed above the glass transition temperature of the copolymer between two electrodes under an applied electric field, forming a hexagonal array of cylinders oriented normal to the film surface.
B. After removal of the minor component, a nanoporous film is formed.
C. By electrodepostion, nanowires can be grown in the porous template, forming an array of nanowires in a polymer matrix.
T.Thurn-Albrecht, et. al. Science 290, 2126 (2000)