Abstract
AbstractPhase behavior of Langmuir monolayers of behenic acid (BeA) has been examined by two‐dimensional compressibility. It was found that phase transitions of BeA could be classified into two distinct categories, named Type‐I and Type‐II in this work. The former is typified by a positive peak on the compressibility‐pressure (β‐) curve, indicating the transition can occur itself in a way of collapse from the initial structure. The latter is characterized by a dropping step on the β‐ curve, implying that it cannot happen itself and the driven force is continuous compression. For BeA molecules, compressibility coefficients at the initial and final state are the same, βi=βf, for Type‐I phase transition from L2 to L2' state, whilst βi>βf for Type‐II phase transition from L2' state to S state.
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