The dispersion state of barium titanate (BT) particle groups in self-assembled BT/poly-L-lactic-acid (PLLA) composites prepared under different fabrication conditions was investigated. In particular, the BT/PLLA/BT heterointerface in the BT aggregates by the self-assembly process was analyzed and the effect of the BT/PLLA/ BT heterointerface and the BT/BT interface on the dielectric properties of BT/PLLA composites were investigated. BT/PLLA composites were fabricated by adding BT particles and BT granules with low and high-speed kneading conditions. The volume fraction of BT in composites varied from 5 to 20 vol.%. The BT aggregates having a BT/PLLA/BT heterointerface were formed under the low-speed kneading condition and the BT agglomerates having a BT/BT interface were formed under the high-speed kneading condition within the selfassembly process. The tan ¤ of the BT/PLLA composite of self-assembled BT aggregates having the BT/PLLA/ BT heterointerface was lower than that of the BT granules having the BT/BT interface. The dielectric constant (¾¤) of the self-assembled composite was increased by growing an average secondary particle area of BT fillers. In contrast, the average secondary particle area of BT granules was increased, as compared with 5 vol.% of BT. However, the change in ¾¤ was saturated. The slopes of the change in the ¾¤ depending on the secondary particle area of BT fillers were different between the self-assembled BT aggregates having the BT/PLLA/BT heterointerface and the BT granules having the BT/BT interface. Thus, it was suggested that it was an important role in improving the dielectric properties to form ceramic secondary particle groups having the ceramics/polymer/ceramics heterointerface by the self-assembly process.
The dispersion of self-assembled BaTiO 3 (BT) agglomerates in poly-L-lactic-acid (PLLA) polymer matrix was decided with the multifractal analysis to investigate characters of the aggregated morphology of the secondary particle group. On the multifractal analysis, the results showed that the average secondary particle area is increased with increasing the capacity dimension (D 0 ). The average secondary particle area is related to BT agglomerates. It showed that S 1/2 and D 0 plot increased linearity. Therefore, BT agglomerates and D 0 have a correlation. It suggested that D 0 is related to the morphology of the BT agglomerates. The average dielectric constant (ε′) is increased with increasing D 0 . It was considered that the formation of the hetero interface of BT/ PLLA contributed to the increase in the average dielectric constant of BT/PLLA composites.
The dispersion of self-assembled β-Si 3 N 4 (SN) agglomerates in stainless steel (SUS316L) was decided with the multifractal analysis to investigate characters of the aggregated morphology of the average secondary particle area of SN particles. The thermal conductivity (λ e) of SN/SUS316L with the average particle diameter of SUS316L powder of 3 μm was higher than that expected from Kanenari model because SN agglomerations were formed. On the other hand, λ e of SN/SUS316L with the average particle diameter of SUS316L powder of 8 μm was lower than that expected from Kanenari model. On the multifractal analysis, the results showed that the capacity dimension (D 0) was not changed with adding SN particles. It suggested that the SN agglomerations were formed with similarity. λ e was increased with increasing the average secondary particle area of SN particles. D 0 was not increased with increasing λ e. It indicated that the forming the network of the thermal conductive particles played an important role in improving λ e. KEY WORDS β-Si 3 N 4 /SUS316L composite material, multifractal analysis, self-assembly, aggregated morphology, thermal conductivity
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.