Magnetic Orientation of Benzophenone Crystals in Fields up to 80.0 KOe

Fujiwara, Mai; Fukui, Minoru; Tanimoto, Yoshifumi

doi:10.1021/jp983432t

Cited by 58 publications

(43 citation statements)

References 11 publications

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“…(1) [8] EðN;q;HÞ ZK 1 2 where m 0 is the magnetic permeability of vacuum, n is the mole number of the crystal, c i is the molar magnetic susceptibility along the i axis, q is the angle between the c 1 and the magnetic field direction, and H is the magnetic field strength. In Eq.…”

Section: Magnetic Orientationmentioning

confidence: 99%

“…Orientation of inorganic and organic aggregates is very important technique for improving the quality of materials in material chemistry. Our group has studied magnetic orientation of organic crystals [8] and carbon nanotubes [9]. By using quasi-microgravity generated by magnetic force, X-ray crystallographic quality of lysozyme crystals is improved [10].…”

Section: Introductionmentioning

confidence: 99%

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Influences of high magnetic field on glycine crystal growth

Sueda

Katsuki

Fujiwara

et al. 2006

Science and Technology of Advanced Materials

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The effects of horizontal high magnetic field (8 T) on both the orientation of the a-form glycine crystal and the growth rate were studied. The aform glycine crystal is oriented in the high magnetic field in such a way that its crystallographic c-axis is at about 458 with the direction of magnetic field. This orientation is explained by the magnetic susceptibility anisotropy of the crystal structure. The crystal growth rate in the c-axis direction decreases by about 20% in a magnetic field (8 T). Mechanisms of the magnetic field effect on the growth rate are discussed. q

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Section: Magnetic Orientationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influences of high magnetic field on glycine crystal growth

Sueda

Katsuki

Fujiwara

et al. 2006

Science and Technology of Advanced Materials

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“…Since the anisotropy of the susceptibility is very large, a magnetic orientation effect is expected when the crystal grows in magnetic fields. In the case of crystal growth from the solution in magnetic fields, it has been reported that the crystals grew as the c-axis is perpendicular to the magnetic field [12].…”

Section: Containerless Crystallization Of Benzophenonementioning

confidence: 99%

Containerless melting and crystallization of diamagnetic organic materials under magnetic levitation condition

Takahashi

Mogi

Awaji

et al. 2006

J. Phys.: Conf. Ser.

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Abstract. Containerless crystallization of benzophenone and containerless melting of a cycloolefin polymer were performed under magnetic levitation conditions. It was found that the growth mechanism changes from dendritic growth to facet growth with decreasing the supercooling degree in the crystallization of benzophenone. In the case of containerless melting and solidification of a cycloolefin polymer, spherical samples were obtained by a homogeneous heating in an electric furnace with a heatproof bore scope.

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“…Here the interesting question arises up to which size the crystals can reorient in the field before they settle to the bottom of the vessel. Recently, Fujiwara et al 46 reported a study of the magnetic field dependence of the order parameter of benzophenone crystals grown in a magnetic field. Here crystal needles of about 1 cm length were formed and the order parameter was determined by visually evaluating the statistics of crystal orientations.…”

Section: Macroscopic Forcesmentioning

confidence: 99%

High Magnetic Fields in Chemistry

Steiner

Gilch²

2003

High Magnetic Fields

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Recent applications of large (∼ 1 T -∼ 30 T) magnetic fields in modern chemical research are reviewed. Magnetic field effects of chemical relevance appear on the levels of quantum mechanics, thermodynamics, and macroscopic forces. Quantum mechanical magnetic field effects are governed by the Zeeman interaction and are borne out as static and dynamic effects in spectroscopy and in chemical kinetics. Magnetic circular dichroism (MCD) spectroscopy and magnetic fluorescence quenching in the gas phase serve to illustrate the former, while radical pair spin chemistry is representative of the latter. The principles of the radical pair mechanism are outlined and highfield applications are illustrated in some detail for photo-induced electron transfer reactions of some transition metal complexes. Thermodynamic effects concern the magnetization of chemical samples, which is the focus of magnetochemistry or -more modern -molecular magnetism, and the equilibrium of chemical reactions. Representative examples of both aspects are described. Finally, the exploitation of orientational forces caused by the magnetic anisotropy of larger particles (from macromolecules to micro-crystals) is exemplified. Crystal growth in a magnetic field may hold a potential for achieving better control of the quality of protein crystals for structural analysis.

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Magnetic Orientation of Benzophenone Crystals in Fields up to 80.0 KOe

Cited by 58 publications

References 11 publications

Influences of high magnetic field on glycine crystal growth

Influences of high magnetic field on glycine crystal growth

Containerless melting and crystallization of diamagnetic organic materials under magnetic levitation condition

High Magnetic Fields in Chemistry

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