Piezoelectric element sensor for LB type cumulative film formation

摘要

PURPOSE:To directly detect and control the formation of an LB type cumulative film on the spot, by building up a monomolecular film on a piezoelectric element under the substantially same condition as a solid substrate and detecting the change quantity of the vibration frequency of the piezoelectric element at the time of building-up. CONSTITUTION:The monomolecular film developed on the interface of air and a liquid is transferred to a solid substrate by passing said substrate through the monomolecular film while said film is compressed under definite surface pressure to form an LB type cumulative film. At this time, the monomolecular film is built up on a piezoelectric element, which is provided so as to operate under the substantially same condition as the solid substrate. Then, by detecting the change quantity of the vibration frequency of the piezoelectric element at the time of building-up, the formation of the LB type cumulative film is directly detected and controlled on the spot.