Construction of defect-diminished lithium 10,12-heptacosadiynoate monolayer by means of crystallization on the water surface

The melting temperature, Tm of lithium 10,12-heptacosadiynoate monolayer on the water surface was evaluated by a combination of two kinds of measurements, the subphase temperature, Tsp dependence of modulus of the monolayer based on a π–A isotherm and also, the Tsp dependence of the electron diffraction, ED patterns of the monolayer. Tm of the monolayer was evaluated to be 300 K from the results of both an apparent decrease in the Tsp vs. modulus curve and the change of the ED pattern from a crystalline triclinic spot to an amorphous halo. The aggregation structure of the monolayer during a compressing process at Tsp below and above Tm was investigated on the basis of the bright field electron micrograph and the ED pattern. The monolayer on the water surface was classified into a crystalline monolayer and an amorphous one depending on the Tsp below and above Tm of the monolayer, respectively. However, the formation of the crystalline and amorphous monolayers is irrespective of the surface pressure. Furthe...