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UID:20251108T181134EST-08364oXEVj@132.216.98.100
DTSTAMP:20251108T231134Z
DESCRIPTION:Abstract: \n\nSelf-assembly of block copolymers and small molec
 ule mesogens gives rise to a rich phase behavior as a function of temperat
 ure\, composition\, and other relevant parameters. The ability to precisel
 y control their chemical functionality combined with the readily tunable c
 haracteristic length scales (~1-100 nm) of their self-assembled mesophases
  position these systems as a versatile and attractive class of materials f
 or compelling applications ranging from membranes for size and chemo-selec
 tive transport\, to optics\, and lithography. As a result there is intense
  interest in elucidating the physical processes relevant for directing sel
 f-assembly in these systems to create application relevant structures\, wi
 th a goal of exploiting such fundamental understanding to create useful ma
 terials or devices. This presentation discusses such directed self-assembl
 y of soft nanostructured materials and emerging methods for generating hig
 hly ordered and heterostructured systems. In particular\, we focus on rece
 nt advances in the creation of highly ordered nanostructured membranes for
  water purification\, and small length scale structures for lithography in
  microelectronics. While much of the progress to date has involved the use
  of a single ‘field’ to direct self-assembly (e.g. shear\, magnetic\, elec
 tric fields\; surface forces/confinement)\, the use of more than one stimu
 lus to control structural order has the potential to produce materials wit
 h true single crystal texture. We show that such single-crystal textures c
 an be produced over unprecedented length scales in a small molecule column
 ar mesophase. Texture control is accomplished by judicious application of 
 magnetic fields and physical confinement\, or by sequential applications o
 f dynamic and static magnetic fields across pertinent phase transitions. W
 e discuss the physical origin of the unique biaxial texture control as rev
 ealed by in situ X-ray scattering experiments.\n\nBio:\n\nProf. Osuji rece
 ived his Ph.D. in Materials Science and Engineering from MIT in 2003\, for
  studies of structure-property relationships and self-assembly of liquid c
 rystalline block copolymers. From 2003-2005 he was a Senior Scientist at S
 urface Logix Inc. where he worked on soft lithography\, and from 2005-2007
  was a Postdoctoral Associate in Applied Physics at Harvard University whe
 re he studied shear-induced structure and dynamics of colloidal gels. From
  2007-2018 he was on the faculty at Yale University in the Department of C
 hemical and Environmental Engineering. In 2018 he joined the University of
  Pennsylvania where he is currently a Professor in the Department of Chemi
 cal and Biomolecular Engineering. He leads an experimental research group 
 focused on structure and dynamics of soft matter and complex fluids. Topic
 s of interest include structure-property relationships in ordered soft mat
 erials\, directed self-assembly of block copolymers and other soft mesopha
 ses or molecular materials\, and rheology and slow dynamics of disordered 
 systems.\n
DTSTART:20181204T180000Z
DTEND:20181204T193000Z
LOCATION:Room 26\, Leacock Building\, CA\, QC\, Montreal\, H3A 2T7\, 855 ru
 e Sherbrooke Ouest
SUMMARY:QCAM: Chinedum Osuji - Creating Useful Nanostructured Soft Material
 s (and single crystals) by Directed Self-Assembly
URL:/chemistry/channels/event/qcam-chinedum-osuji-crea
 ting-useful-nanostructured-soft-materials-and-single-crystals-directed-sel
 f-290197
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