[Spm] (no subject)

[Filby, Andre]

Hi all,
I´m using the AFM in order to obtain force-distance curves in water. I´m using colloid probe technique (with a latex particle) and mica as substrate. In certain conditions I see repulsive forces (the curve "bends" until it gets into contact). What I´d like to know, how does one exactly quantify these repulsive forces? I know how the point of contact is extrapolated (through the 2 linear regimes) but I don´t know if there is any special procedure in order to quantify the repulsive force. Could it be that one has to drop a perpendicular of these 2 linear regimes?
 
Thanks in advance for your help.
 
André


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Von: spm-bounces at spmlist.di.com im Auftrag von spm-request at spmlist.di.com
Gesendet: Fr 09.11.2007 10:43
An: spm at spmlist.di.com
Betreff: Spm Digest, Vol 40, Issue 2



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Today's Topics:

   1. mica sheets (Gerard Oncins Marco)


----------------------------------------------------------------------

Message: 1
Date: Thu, 08 Nov 2007 11:25:33 +0100
From: Gerard Oncins Marco <goncins at ub.edu>
Subject: [Spm] mica sheets
To: "digest <\"\" \">" <spm\"@spmlist.di.com>
Message-ID: <4732E41D.9000305 at ub.edu>
Content-Type: text/plain; charset="iso-8859-1"

Hi everybody,
I am searching for highest quality mica to use it as a substrate for
depositing biological samples (phospholipid bilayers, fatty acids, etc).
We have been buying mica sheets for a while but I am not sure which is
the best way to cut it into small pieces that fit inside our mmode head
(when using a blade the sides of the mica piece flake and it's sort of a
mess). Any advice about how to circumvent this problem will be really
welcome.
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