Zone casting

Duffy. C. M. Andreasen. J. W. Breiby. D. W. Nielsen. M. M. Ando. M. Minakata. T. Sirringhaus. H. (2008). High-Mobility Aligned Pentacene Films Grown by Zone-Casting. Chemistry of Materials, vol. 20, no. 23,7252-9. 

Molecular Alignment from Solution Through the Zone-Casting Techniqne... 

In order to align the molecules in one direction fi om the solution, we devised a zone-casting technique whose principle is based on observations performed during the solvent evaporation of a drop-cast solution [22]. One can observe that the deposited material is mainly oriented in the direction of the solvent evaporation. Theoretically, at adequate conditions it should be possible to obtain from simple drop-casting a homogeneous film with a radial alignment of the superstructure. However, this is quite difficult, since the concentration... 

Figure 4.5 Schematic illustration of the zone-casting of HBC-C12 (a), HR-TEM image displays uniaxially oriented columns after zone-casting (b).

Figure 4.6 Output curves (a) and transfer curves (b) of zone-cast HBC-C12 FETs. Inset is a schematic representation of the zone-cast HBC-C12 FET.

H., Pakula, T. and Mullen, K., A zone-casting technique for device fabrication of field-effect transistors based on disco tic hexa-peri-hexabenzocoronene, Adv. Mater, 17, 684-689, 2005. 

Fig. 7.11 Schematic illustration of zone casting (top) and zone melting (bottom) methods for the alignment control of discotic liquid crystals. Reproduced with permission from [45]. Copyright 2007 The Royal Society of Chemistry...

A. Tracz, T. Makowski, S. Masirek, W. Pisula, Y.H. Geerts, Macroscopically aligned films of discotic phthalocyanine by zone casting. Nanotechnology 18(485303), 1-5 (2007)... 

Fig. 4.10 Zone casting of a lamellar BCP thin film, (a) Taping mode AFM phase image (inset FT transform), and (b) GISAXS pattern of PODMA-i>-PtBA-h-PODMA block copolymer films prepared by zone casting at 40 °C. Arrow substrate withdrawal direction, (c) Scheme of the zone casting technique. Adapted with permission from ref. [98], J. Am. Chem. Soc. 2011, 133, 11802. Copyright 2011 American Chemical Society...

Tang, C., Wu, W., Smilgies, D.-M., Matyjaszewski, K., Kowalewski, T. Robust control of microdomain orientation in thin films of block copolymers by zone casting. J. Am. Chem. Soc. 133, 11802(2011)... 

SCHEME 3.6 Chemical sttucture of different DLC compounds aligned by zone casting technique. 

FIGURE 3.7 (a) Schematic illustration of the zone casting technique (b) filtered inverse EFT image showing the intermolecular periodicity within the columns. (Please see text for fuU caption.)... 

A markedly simple and straightforward approach to alignment of the layer of discs is the so-called zone-casting technique. Deposition of an HBC solution from a stationary nozzle onto a moving substrate (glass or ITO), both of which are temperature-controlled, produces concentration and temperature gradients result-... 

Figure 3.23. Schematic representation of zone-casting process and AFM images of the resulting films of HBC-C12, showing details of the long-ranged order columnar structures with some defects (in circle). Reproduced by permission ofThe Royal...

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