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Books > Science & Mathematics > Science: general issues > Scientific equipment & techniques, laboratory equipment > Microscopy
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Applied Scanning Probe Methods IV - Industrial Applications (Hardcover, 2006 ed.)
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Applied Scanning Probe Methods IV - Industrial Applications (Hardcover, 2006 ed.)
Series: NanoScience and Technology
Expected to ship within 10 - 15 working days
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The Nobel Prize of 1986 on Sc- ningTunnelingMicroscopysignaled a
new era in imaging. The sc- ning probes emerged as a new - strument
for imaging with a p- cision suf?cient to delineate single atoms.
At ?rstthere were two -the ScanningTunnelingMicroscope,or
STM,andtheAtomicForceMic- scope, or AFM. The STM relies on
electrons tunneling between tip and sample whereas the AFM depends
on the force acting on the tip when itwasplacednearthesample.These
were quickly followed by the M- netic Force Microscope, MFM, and
the Electrostatic Force Microscope,
EFM.TheMFMwillimageasinglemagneticbitwithfeaturesassmallas10nm.
WiththeEFMonecanmonitorthechargeofasingleelectron.Prof.PaulHansma
atSantaBarbaraopenedthedoorevenwiderwhenhewasabletoimagebiological
objects in aqueous environments. At this point the sluice gates
were opened and amultitudeofdifferentinstrumentsappeared. There are
signi?cant differences between the Scanning Probe Microscopes or
SPM, and others such as the Scanning Electron Microscope or SEM.
The probe microscopes do not require preparation of the sample and
they operate in ambient atmosphere, whereas, the SEM must operate
in a vacuum environment and the sample must be cross-sectioned to
expose the proper surface. However, the SEM canrecord3Dimage
andmovies, featuresthatarenotavailable withthescanning probes.
TheNearFieldOpticalMicroscopeorNSOMisalsomemberofthisfamily.At
thistimetheinstrumentsuffersfromtwolimitations;1)mostoftheopticalenergy
is lost as it traverses the cut-off region of the tapered ?ber and
2) the resolution is insuf?cient for many purposes. We are con?dent
that NSOM's with a reasonable
opticalthroughputandaresolutionof10nmwillsoonappear.TheSNOMwillthen
enterthemainstreamofscanningprobes. VI Foreword In the Harmonic
Force Microscope or HFM, the cantilever is driven at the
resonantfrequencywiththeamplitudeadjustedsothatthetipimpactsthesampleon
each cycle. Theforcesbetween tipandsample generate multiple
harmonics inthe
motionofthecantilever.Thestrengthoftheseharmonicscanbeusedtocharacterize
thephysicalpropertiesofthesurface.
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