著者

廣田 憲之 北沢 宏一

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌A(基礎・材料・共通部門誌) (ISSN:03854205)

巻号頁・発行日

vol.116, no.9, pp.769-776, 1996-08-20 (Released:2008-07-15)

参考文献数

38

被引用文献数

1 1

著者

廣田 憲之

出版者

公益社団法人 低温工学・超電導学会 (旧 社団法人 低温工学協会)

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.55, no.3, pp.185-188, 2020-05-20 (Released:2020-06-04)

参考文献数

14

---

The magneto-Archimedes effect is a technique to enhance the effect of the magnetic force acting on materials by considering the influence of the surrounding medium. Application of this technique as a way of materials separation is known as the magneto-Archimedes separation. The magneto-Archimedes separation enables the separation of many different materials into each component based on the differences in their magnetic susceptibilities and densities irrespective of the particle size. In this topical review, the principle of the magneto-Archimedes effect and its application as a way to separate materials are described and some other examples applying the magneto-Archimedes effect are introduced.

著者

池添 泰弘 茂木 邦雄 鈴木 隆史 廣田 憲之 植竹 宏往 渋谷 正徳 中川 準 北沢 宏一

出版者

公益社団法人日本磁気学会

雑誌

日本応用磁気学会誌 (ISSN:18804004)

巻号頁・発行日

vol.23, no.4, pp.1557-1560, 1999-04-15

---

We succeeded in making water levitate in air, using not an extreme by strong magnet such as a Bitter-type hybrid matnet, but a compact superconducting magnet. The levitated water ball had a spherical shape and levitated stably for over a day. We named this phenomenon "magneto-Archimedes levitation," because, to achieve it, we used gravitational and magnetic buoyancy forces in the presence of pressurized oxygen gas. In additon, our method enables paramagnetic substances to levitate in air, which has been considered to be impossible owing to the Maxwell relation, divB=0. We also succeeded in making paramagnetic aqueous copper sulfate levitate in air. To the best of our knowledge, this is the first demonstration of stable levitation of paramagnetic substances in the atmosphere.