New Materials Question

Mary Tang mtang at
Mon Nov 1 11:16:27 PST 2004

Hi Michael --

If all you are using is the Zygo, then I don't think this is a problem 
(is that correct, Uli/Maurice?)  As long as your materials don't shed or 
crumble or evaporate, then things should be OK.  If there are concerns 
about cross-contamination, then you might consider placing something 
"clean" (a blank silicon wafer or clean lab tissue) under your ssample 
to protect the stage.  Please ask Uli and Maurice about the need for 
something under your samples  -- but otherwise, they should be OK to 
bring into the lab and use at the Zygo.


Michael Hren wrote:

> To Whom It May Concern,
> I am a graduate student in the Dept. of Geological & Environmental 
> Sciences and am looking to become a laboratory user.  I am working on 
> the effect of microbial biofilms on the chemical dissolution and 
> alteration of mineral surfaces.  As such, I am interested in using the 
> Zygo White Light profilometer to examine mineral surfaces.  I have 
> contacted Mary Tang and Uli Thumser and was directed to contact the 
> committee to obtain approval to bring the materials I am using into 
> the facility.  Specifically, what I am looking to use on the Zygo 
> profilometer is the following:
> First option:
> 1) the mineral apatite.  The chemical formula for this mineral is 
> Ca5(PO4)3F.  This is in solid form, does not crumble or break apart 
> easily, and will be present in pieces the size of a dime.
> Second Option:
> 2) the mineral apatite embedded in an 1 cm round, 4 mm thick, diamond 
> polished hardened epoxy disc  The epoxy is comprised only of C, O, H, 
> and N.  Specifically, it is made by Struers, and is identified as the 
> EPOES Epoxy Resin and EPOAR hardener.  (Additionally, if allowable, 
> this type of sample may be coated with a thin carbon coating (<1 micron).
> If there is someone specific with whom I can discuss the details of 
> this proposed work I would be happy to further explain this study and 
> the planned materials.  Thank you for your time.
> Sincerely,
> Michael Hren
> Michael T. Hren
> Dept. of Geological & Environmental Sciences   
> Stanford University
> Stanford, CA 94305
> (650)725-8704

Mary X. Tang, Ph.D.
Stanford Nanofabrication Facility
CIS Room 136, Mail Code 4070
Stanford, CA  94305
mtang at

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