허준 교수

Abstract The mobility of molecular shuttles inside a mechanically interlocked polymer (MIP) can improve the ionic conductivity and electron transport capacity of a solid polymer electrolyte (SPE) and maintain a mechanically tough structure. The polyrotaxane‐based MIP electrolyte with a necklace‐like molecular structure exhibits high ionic conductivity (σ = 5.93 × 10 −3 S cm −1 at 25 °C and 1.44 × 10 −2 S cm −1 at 60 °C), a high Li + ion transference number ( t + = 0.71), and high electrochemical

KNbO3 (KN) nanowires having a tetragonal structure or a polymorphic phase boundary (PPB) structure, which contains both tetragonal (P4mm) and orthorhombic (Amm2) structures, are formed at low temperatures. The presence of tetragonal and PPB KN nanowires is attributed to the existence of OH− and H2O defects. Further, the tetragonal and PPB KN nanowires change to orthorhombic KN nanowires in the temperature range between 300 and 400 °C owing to desorption of the lattice hydroxyl group. A composite

Dielectric and piezoelectric properties of CuO ‐added KNbO 3 ( KN ) ceramics were investigated. The CuO reacted with the Nb 2 O 5 , formed a CuO – Nb 2 O 5 ‐related liquid phase during the sintering, and assisted the densification of the KN ceramics at low temperatures. Moreover, some of the Cu 2+ ions replaced the Nb 5+ ions in the matrix and behaved as a hardener. The dielectric and piezoelectric properties of the KN ceramics were considerably influenced by the relative density. The 1.0 mol% C

Laboratory experiments were conducted to investigate the performance of the anaerobic sequencing batch reactor (ASBR) for digestion of a municipal sludge. The reactors were operated at an HRT of 10 days with an equivalent loading rate of 0.8-1.5 g VS 1−1 d−1 at 35°C. Solids were accumulated rapidly in the ASBR during start-up period. Flotation thickening occurred in the ASBRs, and its efficiency was comparable to that of additional thickening of the completely mixed control reactor. Solids conce

The crystal structure and piezoelectric properties of (1− x )Pb(Zr 1− y Ti y )O 3 ‐ x Pb(Zn 0.4 Ni 0.6 ) 1/3 Nb 2/3 O 3 [(1− x ) PZ 1− y T y ‐ x PZNN] ceramics were investigated. The 0.665 PZ 0.45 T 0.55 ‐0.335 PZNN ceramic has the triple point composition, where the rhombohedral, pseudocubic, and tetragonal structures coexist. Maximum d 33 and k p values of 770 pC/N and 0.69, respectively, were observed from this specimen; it also exhibited a large ε T 33 / ε o value of 3250. Although the maxim