From: calendar@ALMADEN.IBM.COM (IBM Almaden Research Center Calendar)
Newsgroups: ba.seminars
Subject: IBM ARC seminars 20 - 24 JUL 92
Date: 20 Jul 92 23:30:05 GMT
Article-I.D.: almaden.920720.163005.calendar


                     IBM Almaden Research Center
                           650 Harry Road
                       San Jose, CA 95120-6099

                              CALENDAR

                          July 20-24, 1992




07/21 - LIGHT SCATTERING STUDY OF POLYMER ADSORPTION ON COLLOIDAL
SURFACES-STRUCTURE AND KINETICS
Prof. D. Ou-Yang, Lehigh University, Dept. of Physics

Poly. Sci. & Tech. Sem.    Tues., July 21    10:00 a.m.    Room:  J2-601

We study adsorption of single or double end-modified chains onto
colloidal surfaces by light scattering.  A pancake-to-brush transition
was observed for the adsorbed chains when concentration of chains in
solution is varied.  This is the first experimental evidence of such a
transition predicted by S. Alexander in 1977.  We are investigating into
the mechanism of how polymeric micelle formation interfere with the
transition.

We have also studied the kinetics of adsorption and desorption and are
able to estimate the layer construction and segment rearrangement times.
The issues of reversibility, equilibrium and polydispersity effects will
be discussed.  In contrast to the cases that brushes are non-washable by
solvent, fully developed polymer brush can be replaced by other chains
invading into the layer.  The exchange kinetics are found to be
non-exponential.  Possible mechanisms for the kinetics will be
discussed.
Host:  K. Shull



07/23 - GIANT MAGNETORESISTANCE IN SINGLE FILMS OF HETEROGENEOUS ALLOYS
A. Berkowitz, Physics Dept., University of California at San Diego

Phys. Sci. Sem.    Thurs., July 23    10:00 a.m.    Room:  Aud. A

Giant magnetoresistance, of the same order of magnitude as observed in
multilayer structures, has been found in single films of heterogeneous
alloys consisting of ferromagnetic precipitates in a non-ferromagnetic
matrix.  The Cu-Co system is a prototypical example, and other systems
are being investigated.  The technological promise of these structures
will be considered.
Host:  V. Speriosu


07/23 - MICRO-MECHANICAL AND MICRO-OPTICAL COMPONENTS FABRICATED BY THE
LIGA PROCESS
Dr. P. Bley, BSAC/UC Berkeley, Berkeley, CA

Poly. Sci. & Tech. Sem.    Thurs., July 23    1:00 p.m.    Room:  Aud. A

A short review is given of the LIGA process and the mask technology for
deep-etch x-ray lithography.  (LIGA is an acronym in German for
lithography, galvanik, and abformung--in English, lithography,
electroplating and molding.)  The novel fabrication of microstructures
with different shapes in the third dimension is described as examples of
recent improvements in the process steps.  Microstructures with inclined
side walls are fabricated by variation of the angle of incidence of the
synchrotron radiation and microstructures with different level heights
are fabricated by a combination of x-ray lithography and molding
processes.  Microstructures made of PMMA for use in micro-optics
(cylinder lenses, beam systems, planar waveguides and grating
spectrographs) and microstructures made of metal for use as bandpass and
high pass filters for far infrared are presented.  By combining the LIGA
process with a sacrificial layer technique, movable microstructures can
be fabricated.  Examples for oscillating and rotating microstructures
are acceleration sensors, microgears with integrated optical fibers for
measurement of rotation speed, electrostatic comb drives and
electrostatic stepping motors.  The good performance of these LIGA
microstructures is demonstrated by results of measurements obtained in
the experiments.
Host:  G. Willson


07/24 - CLUSTERED COMPUTATIONAL FLUID DYNAMICS AT IBM ECSEC
S. Succi, IBM ECSEC Rome

Phys. Sci. Sem.    Fri., July 24    1:30 p.m.    Room:  J2-609

A survey on recent activities carried out at ECSEC in the field of
clustered computational fluid dynamics is presented.  These include
cooperative processing in numerical combustion, distributed parallel
processing with Lattice Boltzmann methods for flows in porous media and
preliminary efforts aimed at the distribution of implicit CFD solvers.
A cursory view on miscellaneous cluster applications in the field of
geophysics, structural analysis and ab-initio Molecular Dynamics will
also be offered.
Host:  F. Abraham

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For further information on individual talks, please contact the host
listed above.

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