Image:Ferrofluid large spikes.jpg

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Ferrofluid, a paramagnetic fluid composed of nanoscale ferromagnetic particles suspended in a carrier fluid, was placed onto a glass plate. The edges of the glass plate are visible at the bottom of the image. A powerful N40 neodymium magnet was placed under the glass along with an iron rod to steepen the field. Spikes form, in a phenomenon called normal field instability, where the magnetic forces are great enough to overcome gravity and surface tension to align the fluid in a magnetically ideal manner.

[edit] Equipment

• Canon 5D
• 100mm/f2.8 Macro at f/20
• ISO 100, 1 second exposure
• Background illumination provided by 240watts of 6500K high-cri fluorescent. Highlight illumination by photoflash reflected off a 4ft x 1.5 ft white matt panel, additional highlight illumination provided by a distant tungsten light and a set of deep violet LEDs at offset angles to preserve an appearance of depth otherwise lost in the 2D image.

[edit] Processing

• RAW to 16bit conversion with dcraw
• Slight rotation
• Cropping to 4:3 aspect
• Gain to bring background to white.
• Minor cloning to remove sensor dust from background area
• Scaled to 2048x1536

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This image was selected as a picture of the day for November 9, 2006. It was captioned as followed: English: Ferrofluid, a paramagnetic fluid composed of nanoscale ferromagnetic particles suspended in a carrier fluid Deutsch: Ferrofluid, eine auf magnetische Felder reagierende Flüssigkeit bestehend aus Nanometer großen magnetischen Partikeln, die in einer Trägerflüssigkeit suspendiert sind. Français : Un ferrofluide, fluide fortement polarisé sous l'effet d'un champ magnétique. Español: Ferrofluido, un líquido paramagnético compuesto por partículas ferromagnéticas suspendidas en un fluido. Asturianu: Fierrofluidu, un fluidu paramagnéticu compuestu por partícules ferromagnétiques suspendíes nun fluidu. Česky: Ferrofluidní kapalina sestávající z mikroskopických ferromagnetických částeček uvězněných v nosné kapalině Deutsch: Ferrofluid, eine auf magnetische Felder reagierende Flüssigkeit bestehend aus Nanometer großen magnetischen Partikeln, die in einer Trägerflüssigkeit suspendiert sind. English: Ferrofluid, a paramagnetic fluid composed of nanoscale ferromagnetic particles suspended in a carrier fluid Esperanto: Ferofluidaĵo estas paramagneta likvaĵo el nanometraj magnetaj metaleroj naĝantaj en fluidaĵo Español: Ferrofluido, un líquido paramagnético compuesto por partículas ferromagnéticas suspendidas en un fluido. Français : Un ferrofluide, fluide fortement polarisé sous l'effet d'un champ magnétique. Galego: Ferrofluído, un líquido paramagnético composto por partículas ferromagnéticas suspendidas nun fluído. Magyar : Ferrofluid, egy paramagnetikus folyadék, amely hordozófolyadékban oldott nanoméretű ferromagnetikus részecskékből áll Italiano: Ferrofluid, un liquido paramagnetico composto di particelle ferromagnetiche sospese in un liquido. 日本語: 媒介液に浮いた、ナノ・スケールの強磁性粒子から成る磁性流体 ‪Norsk (nynorsk)‬: Ferrofluid er ei paramagnetisk væske. Polski: Ferrofluid - ciecz będąca zawiesiną ferromagnetycznych cząstek, wykazująca bardzo silne reakcje w obecności pola magnetycznego. Русский: Ферромагнитная жидкость - парамагнитная жидкость, состоящая из ферромагнитных наночастиц, взвешенных в несущей жидкости Svenska: Ferrofluid är en paramagnetisk vätska. 简体中文: 磁流体，一种含有纳米级的铁磁体颗粒的液体。

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