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Abstract
A vertical dipping method is normally employed to prepare polyimide (PI) Langmuir-Blodgett (LB) films for liquid crystal (LC) alignment due to its dipping effects. In this paper, however, we exploited a horizontal method to make PI LB alignment layers on a novel Langmuir trough using a flowing subphase. The surface morphology of PI LB film deposited on a graphite substrate was studied by atomic force microscopy. Experimental results give evidences that the polymer chains are oriented in the flow direction, along which LC molecules are aligned homogeneously. Thus the alignment of LCs may act through the orientation of PI molecules.