Two-dimensional (2D) photonic crystals in the visible wavelength region were
fabricated using anodic porous alumina with a highly ordered hole array configuration.
The transmission properties of an ordered triangular array of an air cylinders with high
aspect ratio in alumina matrix showed a stop band in the spectrum which corresponds
to the band gap in the 2D photonic crystals.
Two-dimensional (2D) photonic crystals were fabricated using anodic porous alumina with a highly ordered air-hole array of triangular lattice with a high aspect ratio of over 200. The transmission properties of the obtained ordered air-hole array in the alumina matrix exhibited a stop band in the spectrum which corresponds to the band gap in 2D photonic crystals.
The two-dimensional (2D) photonic band gap was observed in naturally formed anodic porous alumina. Anodizing of Al under appropriate conditions yielded the anodic porous alumina which had an ordered air-hole array with a multidomain triangular lattice. The transmission spectra of the multidomain triangular air-hole lattice of the anodic porous alumina showed a clear dip in transmission that corresponded to the 2D photonic band gap. The band gap properties of the polycrystalline-type air-hole lattice could be interpreted as being the sum of those for the single-crystalline-type air-hole arrays of anodic porous alumina prepared by an artificial process.
The phase behavior of the newly found miscible polymer blends poly(4-trimethylsilylstyrene)
and polyisoprene was investigated with optical microscopy (OM) and also with differential scanning
calorimetry (DSC), while the degree of polymer−polymer interaction was evaluated with small-angle
neutron scattering (SANS). The blends with homogeneous one phase at various compositions turned into
two phases by heating, showing a lower critical solution temperature (LCST) type phase diagram with
a critical temperature of 172 °C if the degree of polymerization is ca. 370. The blend gave a single glass
transition temperature below the LCST, and the interaction parameter χ was represented as a function
of temperature T according to the relationship χ = 0.027 − 9.5/T.
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