[tt] advanced nanotechnology - Make your own plastic-AFM heads and save tens of thousands of dollars
Eugen Leitl
<eugen at leitl.org> on
Thu Aug 2 10:26:12 UTC 2007
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Date: Thu, 02 Aug 2007 06:08:58 -0400
To: eugen <eugen at leitl.org>
Subject: advanced nanotechnology - Make your own plastic-AFM heads and save tens of thousands of dollars
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"[2]advanced nanotechnology" - 1 new article
1. [3]Make your own plastic-AFM heads and save tens of thousands of
dollars
2. [4]More Recent Articles
3. [5]Search advanced nanotechnology
[6]Make your own plastic-AFM heads and save tens of thousands of dollars
[7]From nanowerk, the successful rapid prototyping of an atomic force
microscope hear (AFM), something which normally costs hundreds of
thousands of dollars
[8]Go to this site for a tutorial on how to build a plastic-AFM head
The heads perform as well as traditional heads but are not as durable.
The computational chemistry simulation software and hardware is
getting supercheap with [9]Nvidia tesla boards and computers (multiple
teraflops for a workstation). Now you can build AFMs for cheap.
Instead of $10 million to setup for serious nanotech work the price is
dropping to about $250,000-500,000.
The most versatile implementation of the scanned probe principle is
the atomic force microscope (AFM). It has become one of the
foremost tools for imaging, measuring and manipulating matter at
the nanoscale. The essential part of an AFM is a microscale
cantilever with a sharp tip (probe) at its end that is used to scan
the specimen surface. The cantilever is typically silicon or
silicon nitride with a tip radius of curvature on the order of
nanometers. When the tip is brought into proximity of a sample
surface, forces between the tip and the sample lead to a deflection
of the cantilever according to Hooke's law. A multi-segment
photodiode measures the deflection via a laser beam, which is
reflected on the cantilever surface. Because there are so many
promising areas in nanotechnology and biophysics which can be
examined by AFM (force spectroscopy on DNA, muscle protein titin,
polymers or more complex structures like bacteria flagella, 3-D
imaging, etc. ) the availability of instruments is crucial,
especially for new groups and young scientists with limited funds.
The price tag of AFMs runs in the hundreds of thousand s of
dollars, though.
Selective Laser Sintering (SLS - a registered trademark of 3D
Systems, Inc.) is an additive rapid manufacturing technique that
uses a high powered laser to fuse small particles of plastic,
metal, or ceramic powders into a mass representing a desired
3-dimensional object. The laser selectively fuses powdered material
by scanning cross-sections generated from a 3-D digital description
of the part (e.g. from a CAD file or scan data) on the surface of a
powder bed. After each cross-section is scanned, the powder bed is
lowered by one layer thickness, a new layer of material is applied
on top, and the process is repeated until the part is completed.
"To evaluate the performance of a rapid prototyped AFM, we
reprinted one of our aluminum AFM heads with the SLS method in
plastic" Robert Lugmaier, a co-author of the paper, explains. "To
compare the noise and drift values of these AFM heads under equal
conditions, the same optical and electrical components were used.
The laser diode, the piezoactuator, and the photodetector were
identical for the plastic printed as well as the aluminum milled
AFM."
[id2304_1.jpg]
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References
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2. http://advancednano.blogspot.com/
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6. http://advancednano.blogspot.com/2007/08/make-your-own-plastic-afm-heads-and.html
7. http://www.nanowerk.com/spotlight/spotid=2304.php
8. http://www.biophysik.physik.uni-muenchen.de/PlasticAFM/
9. http://advancednano.blogspot.com/search/label/nvidia
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16. http://advancednano.blogspot.com/2007/07/adiabatic-quantum-computers-operate.html
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