Filters can remove material that is smaller than the pores because the flow
lines need to curve a bit to squeeze air through. Particles that are heavy
enough tend to follow straight lines (thanks to inertia), and impact on the
substrate. Once a collision occurs, the stickiness that dominates things at
that scale can take over (small particles will stick to almost anything --
Teflon included).
In article <3716EEBA.707E6DEB at student.uu.se>, Mattias Bergström
<mabe1293 at student.uu.se> wrote:
>>I would deeply appreciate information about bacterial adherence to
>different kind of surfaces. HEPA-filters for example keeps bacteria and
>other micro-organisms from passing through, even though the pore size of
>the filter is bigger than the bacteria being caught.
>I’ve heard that the presence of proteins and some sugars, on the medium
>(where the adhesion is to take place) greatly increases the attachment.
>I’ve also heard that the mechanism of the adhesion is yet not known.
>Is this correct? Are there any other chemicals that will increase the
>attachment of the bacteria on the medium? Where can I find new
>information about these things?
>Thanks in advance,
>Sincerely, Mr Bergstrom.
>>>
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