---
title: "Homogeneous alignment"
chunk: 1/1
source: "https://en.wikipedia.org/wiki/Homogeneous_alignment"
category: "reference"
tags: "science, encyclopedia"
date_saved: "2026-05-05T11:28:00.232029+00:00"
instance: "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 ==