When like charges attract
Article Abstract:
Interest in colloidal suspensions of microscopic solid spheres as model systems has perked up recently due to modern digital imaging and the ease in obtaining highly monodisperse solutions. The pair potential or mean force between particles of highly charged colloids suspended in an electrolyte is uncertain. However, in several separations, colloidal particle interactions have been noted, particularly at high sphere density and long screening length where greater repulsion is normally expected. The attraction is caused by a nearby charged double layer of screening ions next to a lattice plane of other spheres or a charged glass wall.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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Very low viscosity at the solid-liquid interface induced by adsorbed C60 monolayers
Article Abstract:
Molecules of C60 have potential for use as an additive to convention lubricant fluids due to low viscosity at solid-liquid interface. The nearly perfect spheres of the C60 molecules rotate rapidly within crystalline solids while retaining their lattice position. C60, adsorbed as monolayers in liquids, influences flow at the surface of a liquid. C60 is adsorbed weakly on the liquid surfaces. The adsorbed layers cause full-slip boundary conditions to be exhibited in the fluid flow between two surfaces. This flow behavior differs from conventional flow of fluids through narrow pores.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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A surprisingly attractive couple
Article Abstract:
Colloidal interactions have long been investigated and experience has shown that colloidal particles repel each other. However, in the past 20 years, it has been shown that like-charged colloidal particles sometimes attract one another. A new study of the attractive forces between confined colloidal particles shows that the attraction may result from the electrostatic influence of the confining plates.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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