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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Homogeneous alignment | 1/1 | https://en.wikipedia.org/wiki/Homogeneous_alignment | reference | science, encyclopedia | 2026-05-05T11:28:00.232029+00:00 | kb-cron |
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. 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. However the exact mechanism of this alignment is not entirely clear.
== References ==