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DTSTAMP:20260609T085211Z
SUMMARY:2012 Fall Graduate Colloquium Series:  Bao-Fei Li/Bahram Shakerin
DESCRIPTION;ENCODING=QUOTED-PRINTABLE:Bao-Fei Li=0D=0A=
Friction Control Between Two Polyelectrolyte Layers=0D=0A=
Polyelectrolyte (PE) coatings can act as very effective lubricants for the reduction of friction between two rubbing surfaces. For two PE-coated surfaces, macroscopic friction is dependent on the degree of interpenetration between two PE layers at molecular scale. By adjusting external physical fields, such as=0D=0A=
electric fields, the friction force is subjected to a dramatic and reversible reduction resulting from changes in PE brush interpenetration. Moreover, at larger loads, which will cause more overlapping between PE chains of opposing=0D=0A=
PE layers and consequently lead to larger resistance, the lubrication property of=0D=0A=
PE layers is also greatly improved by external electric fields. Besides, the effect=0D=0A=
of field's frequency on the friction is also interesting and more revealing since=0D=0A=
friction appears absent in a narrow frequency window.=0D=0A=
=0D=0A=
Bahram Shakerin=0D=0A=
Quantum Gravity and Planck-scale Physics=0D=0A=
Combining quantum theory and the theory of general relativity into a unified framework has been important since 1939. We start with the motivations for quantizing gravity. After a very short review of the most important approaches=0D=0A=
toward quantum gravity and the difficulties that we would encounter, we concentrate on the Planck-scale physics and the importance of minimal length.  The existence of a minimal length scale is widely expected to result in a=0D=0A=
modification of the Heisenberg uncertainty relation. After that, we introduce a=0D=0A=
scheme to experimentally test this conjecture.=0D=0A=
=0D=0A=
For more information contact: Dr. Linda Olafsen=0D=0A=
254-710-2541
LOCATION:Baylor Sciences Building, Room E.125
DTSTART;TZID=US_Central:20121109T153500
DTEND;TZID=US_Central:20121109T170000
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