Orientação molecular em filmes de Langmuir e Langmuir-Blodgett induzida por campo elétrico

Abstract

The development of techniques to fabrication of this films is an indispensable part from materials technology and science. In many technological applications, it is useful control the molecular orientation to produce films with the needed physical properties. The methods based on Langmuir and Langmuir-Blodgett films have demonstrated be a valuable alternative to molecular control. The objective of this study was to develop an alternative method for controlling the molecular structure on Langmuir and Langmuir-Blodgett films through molecular orientation using electric field applied in the subphase (water). The method viability was demonstrated using Langmuir and Langmuir-Blodgett films from Sudan III. On these films, we did analysis from surface pressure isotherm, macroscopic images analysis and wetting contact angle. The results indicated SIII molecules has yours orientation controlled through proposed method and could be applied for films fabricated with other molecules types. Furthermore, this method can be used for control physical properties on devices, such as sensors and solar cells.