Control of Crystal Orientation of Hydroxyapatite by Imposition of a High Magnetic Field

Inoue, Koji; Sassa, Kensuke; Yokogawa, Yoshiyuki; Sakka, Yoshio; Okido, Masazumi; Asai, Shigeo

doi:10.2320/matertrans.44.1133

Cited by 113 publications

(74 citation statements)

References 20 publications

(25 reference statements)

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“…In fact, the high magnetic field can fabricate textured microstructures even for feeble magnetic materials, when the anisotropic magnetic energy on the magnetization is strong enough to align crystal particles. [8][9][10][11][12][13][14][15] Many materials have the magnetic anisotropy of crystals, namely magnetic susceptibility is different in each crystal axis and thus the crystals can be rotated to align to a preferred direction. Recently, the application of high magnetic field for control of structures of materials is recognized as one of the useful technologies in materials processing.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis on Crystal Alignment of Feeble Magnetic Materials under High Magnetic Field

Li²,

Sassa

et al. 2005

Mater. Trans.

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Since superconducting magnet was developed, high magnetic field has been used as one of the effective ways to get textured structures by aligning crystals in materials. It is well known that the high magnetic field can align crystals having magnetic anisotropy. However, effects of Brownian motion of crystals in liquid medium and gravity force on the crystal alignment are not well known. In this study, it has been found that there is a size range of crystal particles in which the crystals can be aligned by high magnetic field under actions of Brownian motion of crystals and gravity force. Moreover, by taking account of these factors, theoretical analysis of crystal alignment under high magnetic field has been carried out to elucidate the phenomena of the crystal alignment in both feeble magnetic materials having well or poor electric conductivity.

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Section: Introductionmentioning

confidence: 99%

Theoretical Analysis on Crystal Alignment of Feeble Magnetic Materials under High Magnetic Field

Li²,

Sassa

et al. 2005

Mater. Trans.

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“…A combination of several techniques is also possible [216,234]. Furthermore, some of these processes might be performed under the magnetic field, which helps crystal aligning [235][236][237][238].…”

Section: Forming and Shapingmentioning

confidence: 99%

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2011

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In the late 1960's, a strong interest was raised in biomedical applications of ceramic materials (named bioceramics a little bit later). Bioceramics was initially used as reasonable alternatives to metals in order to increase their biocompatibility. However, within a short period, it has grown into a diverse class of biomaterials, presently including three essential types: relatively bioinert, bioactive (or surface reactive) and bioresorbable bioceramics. This review is limited to bioceramics prepared from calcium orthophosphates only, which belong to the categories of bioactive and bioresorbable compounds. There have been a number of important advances in this field during the past 30 -40 years. The research was shifted from an initial study on the develop-ment of bioinert bioceramics towards bioactive and bioresorbable bioceramics, and these different types of calcium orthophosphate bioceramics can be tuned through the structural and compositional control. At the turn of the millennium, a new concept of calcium orthophosphate bioceramics has been developed to promote a regeneration of bones. Current biomedical applications of calcium orthophosphate bioceramics include artificial replacements for hips, knees, teeth, tendons and ligaments, as well as repair for periodontal disease, maxillofacial reconstruction, augmenttation and stabilization of the jawbone, spinal fusion and bone fillers after tumor surgery. Potential future applications of calcium orthophosphate bioceramics are demonstrated in drug delivery systems, effective carriers of growth factors, bioactive peptides and/or various types of cells for tissue engineering purposes.

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“…In the case of HAp, the a,b-plane orientates perpendicular to the direction of a magnetic field. 9,10) However, the orientation of c-plane is uncontrollable by imposing a static magnetic field because the c-axis of HAp can arbitrary rotate within the plane perpendicular to the magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Orientation of Hydroxyapatite <I>C</I>-Axis under High Magnetic Field with Mold Rotation and Subsequent Sintering Process

et al. 2005

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Orientation of hydroxyapatite (HAp) crystals is one of the promising ways to utilize their anisotropic nature of chemical and biological properties. On the other hand, the development of super conducting magnet technology enables to introduce a high magnetic field which can control crystal orientation of non-magnetic materials with magnetic anisotropy. In this study, a horizontal 10 T static magnetic field was imposed on slurry containing HAp crystals under the horizontal mold rotation during slip casting process so as to introduce c-axis orientation for some amount of crystals in the sample, and then it was sintered in atmosphere without the magnetic field. From SEM observation and X-ray diffraction, it has been found that the c-axis of pillar shape HAp crystals in the sample treated with the magnetic field and the mold rotation were oriented to a particular direction and it was enhanced by the subsequent sintering process, while the c-axis crystal orientation of the sample treated without the magnetic field and with the mold rotation was not observed before and after the sintering.

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Control of Crystal Orientation of Hydroxyapatite by Imposition of a High Magnetic Field

Cited by 113 publications

References 20 publications

Theoretical Analysis on Crystal Alignment of Feeble Magnetic Materials under High Magnetic Field

Theoretical Analysis on Crystal Alignment of Feeble Magnetic Materials under High Magnetic Field

Untitled

Orientation of Hydroxyapatite <I>C</I>-Axis under High Magnetic Field with Mold Rotation and Subsequent Sintering Process

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