Coagulation of Very Small Iron Grains With 'Web-Like' Structures

Details Coagulation of Very Small Iron Grains With 'Web-Like' Structures Coagulation of Very Small Iron Grains With 'Web-Like' Structures

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1449w&link_type=abstract

Lunar and Planetary Science, volume 27, page 1449

Physics

1

Iron Grains, Particles: Iron, Particles: Magnetized Iron, Particles: Single-Domain, Protostellar Nebulae

Scientific paper

We report the results of a further series of experiments on 20-50 nm-sized iron particles condensed from the gas phase in a condensation flow apparatus. These iron particles coagulate efficiently to form very long chains producing a "web-like" structure at the macroscopic level. It is discovered that these pure-iron chains and webs form even in the presence of weak ambient magnetic fields (<0.2 gauss). Remanance acquisition and alternating field demagnetization studies reveal that large magnetic fields are required to significantly alter the magnetization of these iron webs indicating that they are very magnetically hard. Iron particles in protostellar nebulae may have coagulated similarly and could have aided in the collection of surrounding nonmagnetic material to form even larger grains. We suspect that these particles should be efficient absorbers of microwave radiation and may be seen in the long-wavelength spectra of protostellar nebulae.

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