Ken‐ichi Kan'no

Kindai University

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Yoshio Nakai

Sumitomo Dainippon Pharma (Japan)

Ikuko Akimoto

Wakayama University

Masanobu Shirai

Kyoto University

T. Matsumoto

Institute of Agrobiological Sciences

Osamu Arimoto

Kyoto Pharmaceutical University

Kōichiro Tanaka

Kyoto University

Minoru Itoh

Kagoshima University

Masayuki Fujii

National Institute of Technology, Oshima College

Masayuki Suzuki

Doshisha University

Yuichi Sato

Kanagawa University

Cooperative Institutions

Kyoto University

Kindai University

The University of Tokyo

Tohoku University

Kyushu University

National Institute of Advanced Industrial Science and Technology

Nagoya University

Tokyo University of Science

Japan Science and Technology Agency

Tokyo Institute of Technology

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Demonstration of the Coagulation and Diffusion of Homemade Slime Prepared Under Acidic Conditions without Borate

Journal of Chemical Education (2015)

Naho Isokawa Kazuki Fueda Korin Miyagawa Ken‐ichi Kan'no

Poly(vinyl alcohol) (PVA) precipitates in many kinds of aqueous salt solutions. While sodium sulfate, a coagulant for PVA fiber, precipitates PVA to yield a white rigid gel, coagulation of PVA with aluminum sulfate, a coagulant for water treatment, yields a slime-like viscoelastic fluid. One type of homemade slime is prepared under basic conditions with borate. The method reported in this paper is carried out under acidic conditions with materials that are used for water treatment. Through this demonstration, students can learn about chemical interactions through the coagulation and diffusion of slime. This demonstration can be carried out in 30 min.

Vinyl alcohol

10.1021/acs.jchemed.5b00272

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Citations (14)

Energy Loss Triggered by Atomic-Scale Lateral Force

Physical Review Letters (2013)

Filippo Federici Canova Shigeki Kawai Christian de Capitani Ken‐ichi Kan'no Thilo Glatzel

We perform bimodal atomic force microscopy measurements on a Br-doped NaCl (001) surface to investigate the mechanisms behind frequency shift and energy dissipation contrasts. The peculiar pattern of the dissipated energy in the torsional channel, related to frictional processes, is increased at the positions of Br impurities, otherwise indistinguishable from Cl ions in the other measured channels. Our simulations reveal how the energy dissipates by the rearrangement of the tip apex and how the process is ultimately governed by lateral forces. Even the slightest change in lateral forces, induced by the presence of a Br impurity, is enough to trigger the apex reconstruction more often, thus increasing the dissipation contrast; the predicted dissipation pattern and magnitude are in good quantitative agreement with the measurements.

Atomic units

Apex (geometry)

10.1103/physrevlett.110.203203

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Dichroic Optical Absorptions and Thermal Reorientation of Jahn-Teller Distorted Ag²⁺Centers in CbCl₂

Journal of the Physical Society of Japan (1975)

Ken‐ichi Kan'no Yoshio Nakai

Photon-induced dichroism and its isothermal decay of γ-irradiated CdCl 2 : AgCl are investigated in the range of 1.8–25 K. Conventional measurements of anisotropic absorption spectra reveal that at least two bands peaking at 395 and 540 nm are attributed to Ag 2+ centers distorted tetragonally by the Jahn-Teller effect. Time-dependent detections and analysis of the dichroism under excitation with polarized light allow to determine the ratio f (≡σ ⊥ /σ // ) of dipole strengths parallel and perpendicular to the distortion axis, yielding f ≃5.9±0.5 and 7.1±0.5 for the 395 and 540 nm bands, respectively. The rate of thermal reorientation of the distortions among three equivalent configurations is found to be expressed by w ( T )=ν 0 exp (- E / k T ) with the values E ≃250 cm -1 and ν 0 ≃2×10 5 sec -1 .

Dichroism

Jahn–Teller effect

10.1143/jpsj.38.1420

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Luminescence from self‐trapped excitons in BaFI and BaFBr_1–xI_x crystals

physica status solidi (b) (2008)

Akimasa Ohnishi Ken‐ichi Kan'no

Abstract Luminescence from BaFI and BaFBr 1– x I x crystals has been investigated using vacuum ultraviolet photons from synchrotron radiation in the temperature range of 10–300 K. In BaFI, two kinds of luminescence bands are observed under band‐to‐band excitation: one is the 4.52 eV band appearing at low temperatures, and the other is the 3.44 eV band appearing as the 4.52 eV band weakens with increasing temperature. From the excitation spectra, the 4.52 eV band is attributed to the radiative decay of a self‐trapped exciton (STE), and the 3.44 eV band to the extrinsic luminescence coming from an STE trapped by an I – vacancy. The change of luminescence spectra studied in BaFBr 1– x I x suggests that the STE configuration of on‐center type is responsible for the 4.52 eV intrinsic band, and the off‐center instability hardly occurs in BaFI. The temperature dependence of the 4.52 eV and 3.44 eV band intensities is well explained by assuming an STE relaxation mechanism whereby the STE relaxes through phonon‐assisted tunneling and hopping diffusion processes at high temperatures. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Atmospheric temperature range

10.1002/pssb.200844160

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Lattice Relaxation Effect Associated with Core Holes in Ionic Crystals Studied by Time-Resolved Luminescence Spectroscopy

Journal of the Physical Society of Japan (1996)

T. Matsumoto Ken‐ichi Kan'no Minoru Itoh Nobuhito Ohno

Auger-decay-free core luminescence in RbF, CsF, CsCl, CsBr and BaF 2 has been studied under monochromatic vacuum ultraviolet light excitation using a time-resolved technique. Luminescence spectra associated with core holes are carefully separated from those originating in the valence-band excitation. Based on the spectral shape and energy range of the luminescence bands, a lattice relaxation effect following the core hole creation is discussed.

Monochromatic color

Persistent luminescence

Auger effect

10.1143/jpsj.65.1195

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Optical Conversion between Two Types of Relaxed Exciton States in RbCl:I

Journal of the Physical Society of Japan (1986)

Osamu Arimoto Takuya Mukai Ken‐ichi Kan'no Yoshio Nakai

Optical conversion between two types of relaxed exciton states in RbCl:I has been investigated by means of double excitation method. When the crystal irradiated with ArF-excimer laser pulse is excited subsequently with N 2 -laser pulse, emission from the relaxed exciton of one-center type localized on the site of an I - ion ( NE emission ) occurs. Generation of the NE omission is accompanied by a simultaneous decrease of emission from the relaxed exciton of two-center type with the configuration of [ICl - +e] ( BG emission ). Intensity change of induced NE emission as a function of delay of N 2 -laser pulse irradiation was found to reflect decay times of BG emission. It is concluded that relaxed exciton of two-center type can be converted optically to that of one-center type via its hole-excited state.

Excimer

Biexciton

Crystal (programming language)

10.1143/jpsj.55.4519

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Vibronically Allowedd-dTransitions of Cu²⁺Centers in CdCl₂and CbBr₂

Journal of the Physical Society of Japan (1974)

Ken‐ichi Kan'no Seiji Mukai Yoshio Nakai

10.1143/jpsj.36.1492

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Citations (24)