Response of a Living Body to 8-Tesla Magnetic Field(Crystal Growth, Chemical Reaction and Biology)

A study was made to investigate body function in high magnetic field of 8-tesla. In order to avoid magnetic-field effect on the measuring system, long distance was placed between a experimental animal and the measuring system. Changes in contractility of the heart were measured from frogs. Heart and respiratory rates were recorded from rabbits. Contractility of the heart was increased with increasing magnetic fields from 0 to 8 tesla in frogs. Heart and respiratory rates were decreased with increasing magnetic fields from 0 to 8 tesla

Magneto-Absorption Spectra of One-Dimensional Ising Antiferromagnets in High Magnetic Fields(Magnetooptics)

We have performed magneto-absorption spectra measurements of the quasi-one-dimensional antiferromagnet RbFeCl_3.2H_2O with a hybrid magnet installed at High Field Laboratory for Superconducting Materials in Tohoku University

Effects of Vertical Magnetohydrodynamic Flows on Chiral Surface Formation in Magnetoelectrolysis

Magnetoelectrolysis (electrolysis in magnetic fields) has potential to produce chiral surfaces on metal films. The Lorentz force causes two types of magnetohydrodynamic (MHD) flows; a vertical MHD flow and micro-MHD vortices, and the combination of these MHD flows has been considered to produce chiral surfaces. This paper shows the effects of vertical MHD flow on the chiral surface formation in magnetoelectrodeposition (MED) and magnetoelectrochemical etching (MEE) of copper films. To control the vertical MHD flows the working electrode was embedded in a tube wall with various heights of 2–12 mm, and the vertical MHD flows were expected to penetrate into the tubes with damping. In both MED and MEE experiments, the surface chirality diminished considerably at the wall height of 12 mm. When the penetrating MHD flow could not reach the electrode surface in the sufficiently tall wall, such an MHD flow could not affect the micro-MHD vortices. These results demonstrate that the vertical MHD flow plays a significant role in symmetry breaking of micro-MHD vortices

Novel Electrochemical Phenomena in Magnetic Fields(Research in High Magnetic Fields)

Recent two topics are given of electrochemical studies in steady magnetic fields at the High Field Laboratory of Tohoku University. One is the magnetic-field-induced diffusion-limited-aggregation in the pattern formation of silver electrodeposits . The other is the magnetic field effect on the learning effect in a dopant-exchange process of an organic conducting polymer polypyrrole

A Morphological Study of Electroless Deposition in High Magnetic Fields(Crystal Growth, Chemical Reaction and Biology)

Growth morphology of a silver metal-leaf was investigated in high magnetic fields up to 8T as an experimental approach to the diffusion-limited aggregation (DLA) with the lateral drift of particles. The silver metal-leaves were grown around a square \u27seed\u27 of copper from a AgNO_3 aqueous solution by means of the electroless reduction of silver ions. The growth pattern of the metal-leaf had a typical DLA structure with the fractal dimension of 1.62 in the absence of magnetic field. On the other hand, it had a spiral and dense branching structure at 8T, in which the crossover in the fractal dimension from 1.69 to 2 was observed with increasing length scale. The spiral direction was reversed by the reversal of the applied field. A metal-forest pattern of silver was also investigated, which was grown around a copper ribbon. Its growth morphology changed from the DLA pattern without the field into a canting and dense pattern at 8T

High Field Magnetooptics of Diluted Magnetic Semiconductors(Magnetooptics)

Absorption and luminescence spectra of Cd_Mn_xSe (x=0.10 and 0.38) and reflectance spectra of Cd_Co_xSe (x=0.012) were investigated in high magnetic fields up to 25 T by a hybrid magnet and a magnetospectrometer with an optical fiber system

Magnetic Field Effect on Electron Transfer Process in Electrochemical Reaction(Crystal Growth, Chemical Reaction and Biology)

A new method with MHD electrode (MHDE) to analyze the electrochemical reaction under the magnetic field is applied to the copper reduction. The Tafel plots obtained at the magnetic field up to 13T show that there is no change in the slopes but drastic decrease of the current density in comparison with the results in the no or low magnetic field

High-pressure infrared absorption in Cs2TCNQ3 crystals grown under magnetic field

Pressure dependence of infrared absorption has been measured in Cs2TCNQ3 single crystals grown under magnetic field of 5 T (5 T crystals). The behavior of the C-CN as well as C-H stretching modes suggest that there occurs a phase transition which resembles to the one related to the insulator to metal transition in the crystals grown without magnetic field (0 T crystals). This transition, however, takes place at 4.1 GPa, slightly higher than the case of 0 T crystals. The charge transfer degree of the neutral and radical molecules are found to be ρ = 0.30-0.37 and 0.81-0.85, respectively, which are significantly different from that of 0 T crystals. These differences are suggested to arise from the changes in the relative positions of the TCNQ molecules, as indicated from the behavior of the EMV mode