[BNC-grads-list] PUSPM Fall 2009 Seminar Series

[Deborah S Starewich]

>
> Dear PUSPM community,
>
> I hope everyone's summer went well.  The Purdue University Scanning  
> Probe
> Microscopy (PUSPM) user's group seminar series will be continued  
> during the Fall
> 2009 semester. The first talk of the semester will be this Friday,  
> August 28th
> in Birck 2001.
>
> Daniel Kiracofe, a PHD student in Professor Raman's research group  
> will be
> giving a talk titled "On eigenmodes, stiffness, and sensitivity of  
> atomic force
> microscope cantilevers in air versus liquids."  Please see the below  
> abstract
> for more information.  Pizza will be provided at 11:30 a.m., the  
> talk will begin
> at noon, and end by 1:00 p.m..
>
> Please see the attached files.  Or visit our website
> (www.engineering.purdue.edu/PUSPM) for more information about the  
> upcoming
> semester.
>
>
> I hope to see you there,
> Ryan Wagner
> PUSPM student coordinator
>
>
> P.S. To be removed from this email list send the request to rbwagner at purdue.edu 
> .
>
>
> Abstract:
> The effect of hydrodynamic loading on the eigenmode shapes, modal  
> stiffnesses,
> and optical lever sensitivities of Atomic Force Microscope (AFM)
> microcantilevers is investigated by measuring the vibrations of such
> microcantilevers in air and water using a scanning laser Doppler  
> vibrometer. It
> is found that for rectangular tipless microcantilevers, the measured  
> fundamental
> and higher eigenmodes and their equivalent stiffnesses are nearly  
> identical in
> air and in water. However, for microcantilevers with a tip mass or  
> for picket
> shaped cantilevers there is a marked difference in the second (and  
> higher)
> eigenmode shapes between air and water that leads to a large  
> decrease of modal
> stiffness in water as compared to air, as well as a decrease in  
> optical lever
> sensitivity. These results are explained in terms of hydrodynamic  
> interactions
> of microcantilevers with non-uniform mass distribution. The results  
> clearly
> demonstrate that tip mass and hydrodynamic loading must be taken  
> into account in
> calibration while using higher-order eigenmodes in dynamic AFM.
Deborah S. Starewich
Administrative Assistant to Prof. Timothy Sands
Birck Nanotechnology Center
1205 W. State Street, Room 1027
West Lafayette, IN  47907-2057

765-494-3509
765-496-8383 (fax)
dstarewi at purdue.edu

Www.nano.purdue.edu



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