Homogeneous alignment

In liquid crystals homogeneous alignment, sometimes called planar alignment, is the state of alignment where molecules align in parallel to a substrate. The opposite method is homeotropic alignment.^[1]

For planar alignment - polyimides can be used. One of the popular ones is PI-2555.

The surface has to be rubbed by paper or by a velvet or similar cloth in order to make the alignment axis parallel to the rubbing.^[1] However the exact mechanism of this alignment is not entirely clear.

References

1 2 Jones, Lesley Parry (2012), "Alignment Properties of Liquid Crystals", in Chen, Janglin; Cranton, Wayne; Fihn, Mark (eds.), Handbook of Visual Display Technology, Berlin, Heidelberg: Springer Berlin Heidelberg, pp. 1390–92, doi:10.1007/978-3-540-79567-4_86, ISBN 978-3-540-79566-7, retrieved 2025-01-08

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[:0-1] 1 2 Jones, Lesley Parry (2012), "Alignment Properties of Liquid Crystals", in Chen, Janglin; Cranton, Wayne; Fihn, Mark (eds.), Handbook of Visual Display Technology, Berlin, Heidelberg: Springer Berlin Heidelberg, pp. 1390–92, doi:10.1007/978-3-540-79567-4_86, ISBN 978-3-540-79566-7, retrieved 2025-01-08

[1]

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References