Perpendicular Magnetic Field Orientation of Acicular Particles: Oblique Orientation with Field Gradient and Viscosity Gradient in Coating

Y. Satoh;S. Shikama;M. Kataoka;Y. Nakamura
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引用次数: 1

Abstract

The LIPS (longitudinally oriented inside layer, perpendicularly oriented surface layer) method of film orientation was improved in order to enable preparation of obliquely oriented tapes with a definite orientation angle. The permanent magnet pairs previously used in LIPS perpendicular orientation were replaced by an electromagnet with long iron plates for extension of the magnetic poles. Obliquely oriented tapes are easily prepared by appropriately choosing the coating speed and drying conditions. Coatings dried in a perpendicular magnetic field with an intensity gradient were found to be oriented not perpendicularly, but obliquely. It is thought that inner-layer particles are more easily displaced by the field gradient force than surface particles because of the effect of the viscosity gradient in the coating drying process.
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针状粒子的垂直磁场取向:涂层中具有场梯度和粘度梯度的倾斜取向
改进了膜取向的LIPS(纵向取向内层,垂直取向表层)方法,以制备具有一定取向角的倾斜取向带。以前在LIPS垂直方向上使用的永磁体对被一个带有长铁板的电磁铁所取代,以延长磁极。通过适当选择涂布速度和干燥条件,可以容易地制备倾斜取向的胶带。在具有强度梯度的垂直磁场中干燥的涂层被发现取向不是垂直的,而是倾斜的。人们认为,由于涂层干燥过程中粘度梯度的影响,内层颗粒比表面颗粒更容易被场梯度力移位。
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