Mitsuru Takenaga

Electronic transport in Langmuir-Blodgett films of metal-(dmit)2

Thermoelectric power in highly conductive Langmuir-Blodgett films of tridecylmethylammonium-Au(dmit)2 (σRT 30−50 Scm) was examined. The metallic nature of this material is suggested from the results of the thermoelectric power. The resistivity increased with aging, however the thermoelectric power was invariant. These results suggest that the metallic nature of the film is preserved after aging. The newly developed conductive LB films of didecyldimethylammonium-Pd(dmit)2 showed a high conductivity of 5.1 Scm at room temperature. From the temperature dependence of the conductivity, semiconductor-like transport was suggested.

HALL EFFECT OF METALLIC LANGMUIR-BLODGETT FILMS BASED ON BISETHYLENEDIOXYTETRATHIAFULVALENE COMPLEX OF DECYLTETRACYANOQUINODIMETHANE

The Hall effect of a metallic Langmuir–Blodgett film based on bisethylenedioxytetrathiafulvalene complex of decyltetracyanoquinodimethane has been investigated using a double ac Hall method. The polarity of the Hall coefficient is positive over the measuring temperature range. The carrier density is of the order of 1021 cm−3, almost independent of temperature, and the Hall mobility, of around 0.05 cm2 (V s)−1 at room temperature, is in a single activated process. The Hall results have been interpreted with an inhomogeneous structure model, and support that metallic domains are developed throughout the whole sample.

Adhesive failure peak in peel spectra

Peel force spectra for pressure-sensitive adhesive tapes provide a peel peak in the adhesive failure region. The observed peak behavior is coincident with calculation based on a viscoelastic peel model. It turns out that the origin of the peak is significantly associated with viscoelasticity or short relaxation time of the adhesive.

Peel test using nonstationary peel method

Abstract The cohesive peel spectra of pressure-sensitive adhesive (PSA) tapes have been measured using a non-stationary peel tester. The experimental evidence and a viscoelastic analysis based on a peel model indicate that there are no significant effects of acceleration in the normal rate region. The nonstationary peel tester can be regarded as a useful tool for testing and evaluating PSA tapes.