2009/09/24 by Kenji Imoto, Munehiro Date, Eiichi Fukada +4 · 5 citations
Chemistry · Engineering · Materials Science · #Advanced Sensor and Energy Harvesting Materials #Atomic force microscopy #Chemical engineering #Chemistry #Composite material #Dielectric materials and actuators #Lactic acid #Materials science #Nanotechnology #Organic chemistry #Piezoelectricity #Polymer #Polymer Nanocomposites and Properties #Supercritical fluid
paper · doi:10.1143/jjap.48.09ke06
openalex publication_date 2009/09/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
Poly(L-lactic acid) (PLLA), which is a type of chiral polymer, was subjected to a supercritical CO 2 (s-CO 2 ) treatment to change its high-order structure, realizing an improvement in its piezoelectricity. The piezoelectric constant e of the PLLA film treated with s-CO 2 (sco2-PLLA) was twofold higher than that of the PLLA film fabricated by the conventional method. From observation by atomic force microscopy (AFM), it was found that, upon treatment with s-CO 2 , the grain structure of the sco2-PLLA film became homogeneous, in comparison with that in the PLLA film without s-CO 2 treatment. Then, we confirmed that, using the sco2-PLLA film, vibration control using a negative-capacitance circuit could be more efficiently carried out than that using the PLLA film without s-CO 2 treatment.