Abstract
This paper concerns recent research into the autonomous formation of micro-structures in low carbonyl iron powder (CIP) concentration magneto active polymers (MAP). Higher concentrations of CIP show an isotropic distribution of magnetic filler throughout the entire sample, while autonomous structure formation is possible at mass concentrations lower than 3%. The formation of micro-toroids commences as CIP concentration approaches 1% wt. Further development of coherent rings with a defined order follow as CIP concentrations increase toward 2% wt, whilst exceeding 3% wt leads to the same isotropic distribution found in higher concentration MAP. Structured samples containing between 1% wt and 3% wt CIP were investigated using X-Ray tomography where solitary structures could clearly be observed. The ring structures represent microinductivities whose geometries can be manipulated during fabrication. In addition, these structures are magnetic field sensitive. This is not only relevant to applications in the GHz and THz areas but recent research has revealed implications for optical, thermal, acoustic and even chemical MAP sensors.
Highlights
Magnetoactive elastomers (MAE) are composite materials comprising micrometer sized ferromagnetic particles distributed within a soft, nonmagnetic elastomer matrix.1 Their mechanical2,3 and electrical4,5 properties have been extensively investigated.There is considerable interest in the engineering of such materials to have deliberate structure, though most research has dealt with surface, rather than internal, structuring.6 Recent developments in 3D printing technology have extended the conventional 3 degrees of freedom to 6 by including particulate orientation and gradient distribution.7 the precise positioning of micro-structures within a magneto active polymers (MAP) is still difficult using conventional fabrication technology.LOW carbonyl iron powder (CIP) CONCENTRATION MAP
The break point of the CIP ring around the rising bubble depends on the ascent rate
As the CIP concentration increases toward 2%, the diameter of the toroids grows until the ring structures can no longer stand alone and contigation takes place as shown in Figure 4 b)
Summary
Magnetoactive elastomers (MAE) are composite materials comprising micrometer sized ferromagnetic particles distributed within a soft, nonmagnetic elastomer matrix.1 Their mechanical2,3 and electrical4,5 properties have been extensively investigated.There is considerable interest in the engineering of such materials to have deliberate structure, though most research has dealt with surface, rather than internal, structuring.6 Recent developments in 3D printing technology have extended the conventional 3 degrees of freedom to 6 by including particulate orientation and gradient distribution.7 the precise positioning of micro-structures within a MAP is still difficult using conventional fabrication technology.LOW CIP CONCENTRATION MAP. Particles tend to gather on the boundary layers of the bubbles while scitation.org/journal/adv they ascend. The break point of the CIP ring around the rising bubble depends on the ascent rate.
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