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1楼 sean19830322
等级:小学生
发帖数:3
回帖数:12
|  发帖时间 - 2006/1/16 16:15:47
| Ferrofluid is a stable colloidal suspension of sub-domain magnetic particles in a liquid carrier. The particles, which have an average size of about 100 (10 nm), are coated with a stabilizing dispersing agent (surfactant) which prevents particle agglomeration even when a strong magnetic field gradient is applied to the ferrofluid. The surfactant must be matched to the carrier type and must overcome the attractive van der Waals and magnetic forces between the particles. The colloid and thermal stabilities, crucial to many applications, are greatly influenced by the choice of the surfactant. A typical ferrofluid may contain by volume 5% magnetic solid, 10% surfactant and 85% carrier. In the absence of a magnetic field, the magnetic moments of the particles are randomly distributed and the fluid has no net magnetization. When a magnetic field is applied to a ferrofluid, the magnetic moments of the particles orient along the field lines almost instantly. The magnetization of the ferrofluid responds immediately to the changes in the applied magnetic field and when the applied field is removed, the moments randomise quickly. In a gradient field the whole fluid responds as a homogeneous magnetic liquid which moves to the region of highest flux. This means that ferrofluids can be precisely positioned and controlled by an external magnetic field. The forces holding the magnetic fluid in place are proportional to the gradient of the external field and the magnetization value of the fluid. This means that the retention force of a ferrofluid can be adjusted by changing either the magnetization of the fluid or the magnetic field in the region.
(Copy from  http://www(dot)amazingmagnets(dot)com/ *域名隐藏* ?PageAction=VIEWPROD&ProdID=108） 本帖子2006-01-16 16:16:57由sean19830322进行编辑!!
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2楼 szjc520
等级:中专生
发帖数:11
回帖数:326
| 发帖时间 - 2006/1/16 16:19:05
| 晕死，这么多，段都不分的，见了就吓死，哪里有命翻哦
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3楼 sean19830322
等级:小学生
发帖数:3
回帖数:12
| 发帖时间 - 2006/1/16 16:21:52
| 看的一头雾水，都不知道这东西是干什么的！都怪英语不够好！
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4楼 sean19830322
等级:小学生
发帖数:3
回帖数:12
| 发帖时间 - 2006/1/16 16:32:09
| | 呵呵，以为看懂了，结果一查资料，发现什么都没看懂！ 本帖子2006-01-16 16:51:33由sean19830322进行编辑!!
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5楼 charlestang298
等级:博士生
发帖数:158
回帖数:1070
| 发帖时间 - 2006/1/16 16:36:34
| 有心无力呢！
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6楼 sean19830322
等级:小学生
发帖数:3
回帖数:12
| 发帖时间 - 2006/1/16 16:43:51
| 我好象还是没看懂！。。。。。。郁闷！。。。。。。
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7楼 sean19830322
等级:小学生
发帖数:3
回帖数:12
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8楼 prestonhe
等级:博士生
发帖数:45
回帖数:1283
| 发帖时间 - 2006/1/16 17:52:52
| 我头晕~~~
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9楼 sean19830322
等级:小学生
发帖数:3
回帖数:12
| 发帖时间 - 2006/1/16 17:59:10
| 还是不明白是什么产品，希望明天来的时候达人能告诉我！头大啊！
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10楼 fred_ku
等级:中专生
发帖数:26
回帖数:289
| 发帖时间 - 2006/3/26 10:57:39
| | 不明白是什么产品那你要弄清干吗? 谈的应该是外磁场对磁性液体的影响?磁性液体就是由磁性小颗粒放在液体载体里形成的吧?
太具体的不知道，
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