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lsyfdcg

гæ (СÓÐÃûÆø)

[ÇóÖú] Çó·­ÒëÒ»¶Î£¬Ó¢·­ÖУ¬ºÍÏûÅݼÁÓйأ¬·­ÒëºÃµÄ×··Ö

If a thin oil layer covers the air¨Cwater surface and many
small, hydrophobic solid particles are present at the surfaces of
the antifoam oil drops and are able to enter the air¨Cwater
surface, they showed that capillary effects cause the oil layer at
the surface to form an oil collar around the portion of the
particle projecting outward from the drop (Fig. 2). If the equilibrium
contact angle ¦ÁSO between the oil¨Cwater interface and
the solid surface (measured through the water) exceeds 90¡ã,
inspection of Fig. 2 reveals that as oil is drawn into the collar,
the contact line at the bottom of the collar advances until it
meets the contact line where the solid emerges from the oil
drop. At this point the collar coalesces with the drop, allowing
the drop to enter the air¨Cwater surface. On the other hand, if
there is no oil layer on the air¨Cwater surface, the criterion for
oil to enter the surface following entry by a solid particle is
more restrictive [1]:
A+B>180¡ã
with A the equilibrium contact angle (measured through
the water) where an air¨Cwater interface meets the solid. Thus,
when solid particles are present at the oil¨Cwater interface, an oil
drop can enter the air¨Cwater surface in some cases in the
presence of but not in the absence of an oil layer on the surface.

[ Last edited by lsyfdcg on 2012-3-5 at 14:40 ]

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