Bulletin of the Chemical Society of Japan

Matsukuma, Daisuke; Watanabe, Hirohmi; Fujimoto, Aya; Uesugi, Kentaro; Takeuchi, Akihisa; Suzuki, Yoshio; Jinnai, Hiroshi; Takahara, Atsushi

doi: 10.1246/bcsj.20140260pmid: N/A

We have demonstrated that the liquid/solid interfacial structure of liquid marbles is determined by the surface–interface interaction between the encapsulating particles and liquid droplet. X-ray computerized tomography (X-ray CT) confirmed that the decrease of the solid-over-liquid spreading coefficient (SS/L) allowed the particles to be submerged in the liquid. Moreover, the difference in interfacial structure had a strong effect on the dynamic mechanical stability of liquid marbles. Two liquid marbles only merged upon contact when at least one liquid marble had a small SS/L value. X-ray CT observations also revealed that the liquid at the solid/liquid interface did not interdiffuse easily.

Doi, Yasuyuki; Haneda, Masaaki; Ozawa, Masakuni

doi: 10.1246/bcsj.20140230pmid: N/A

The effect of CeO2 additive on the catalytic performance of Ba–Y2O3 prepared by coprecipitaion for the direct decomposition of NO was investigated. Although Ba–Y2O3 effectively catalyzed NO decomposition, its activity was clearly increased by addition of CeO2. The optimum CeO2 content was 10 mol %. CO2-TPD measurement revealed that the addition of CeO2 into Ba–Y2O3 caused an increase in the CO2 desorption peak in the temperature range of 473 and 723 K derived from highly dispersed Ba species. The predominant role of CeO2 additive was suspected to effectively create the highly dispersed Ba species as catalytically active sites. Kinetic studies of NO decomposition on Ba–CeO2(10)–Y2O3 suggested that coexisting O2 suppresses the NO decomposition reaction by competitive adsorption. Isotopic transient kinetic analysis suggested a reaction pathway in which the surface NOx adspecies act as reaction intermediates for the formation of N2 in NO decomposition over Ba–CeO2–Y2O3. We concluded that CeO2 additive does not directly participate in the NO decomposition reaction as catalytically active species.

Imazu, Naoki; Fujigaya, Tsuyohiko; Nakashima, Naotoshi

doi: 10.1246/bcsj.20140277pmid: N/A

To fabricate transparent conducting films (TCFs) for electronic devices, both a high conductivity and thermal stability are significant issues due to the need for a high temperature annealing process. In this report, we describe the preparation of a highly transparent (94% transmittance), conductive (surface resistivity: 354 Ω sq−1) and thermally stable double-walled carbon nanotube (DWCNT) film without adding any chemical doping or rinsing. Such film was obtained by a simple dilution and condensation/filtration process (DC/F). The procedure is quite simple, and thus large scalability is easy.