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BEGIN:VEVENT
DTSTAMP:20260803T052612Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20100126T203000Z
DTEND:20100126T213000Z
UID:event549@bu.edu
URL:http://physics.bu.edu/internal/events/show/549
SUMMARY:Ionic Driven Self-Assemblies: Patterns and Symmetries
DESCRIPTION:Featuring Monica Olvera de la Cruz\, Northwestern University\nH
	osted by: Rama Bansil\nPoster: http://physics.bu.edu/internal//posters/2010
	_Spring/02_Cruz.pdf\n\nPart of the Physics Department Colloquia Series.\n\n
	Abstract:\nChiral structures at the nanoscopic level are ubiquitous in natu
	re. Helical structures are quintessential examples of chirality and spontan
	eously arise in collagen\, actin\, viruses and synthetic materials at the n
	anometer scale. Using electrostatic forces we are able to show the formatio
	n of helical patterns on the surface of cylindrical fibers or porous aqueou
	s channels. Furthermore\, through a straightforward approach we control the
	 strength of the electrostatic interactions through the concentration of io
	ns and the dielectric constants of the media thereby having a mechanism to 
	pattern the surface of fibers or channels into helical patterns with differ
	ent pitch angles.  In spheres\, on the other hand\, ionic correlations may 
	lead to buckling. This novel electrostatic driven faceting mechanism of ion
	ic shells into icosahedra breaks spherical\, icosahedral and rotational sym
	metries due to different arrangements of the charged components amongst the
	 facets. This buckling appears on vesicles of cationic-anionic molecules\, 
	which we synthesize and analyze by x-rays scattering\, as well as in opposi
	tely charged molecules co-adsorbed onto interfaces\, which form ionic rafts
	.
LOCATION: \, \, 
STATUS:CONFIRMED
CLASS:PUBLIC
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