Accession Number : ADA322379

Title :   Supramolecular Materials: Self Organized Nanostructures.

Descriptive Note : Technical rept. 1 Jan-31 Dec 96,

Corporate Author : ILLINOIS UNIV AT URBANA DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s) : Stupp, Samuel I. ; LeBonheur, Vassou ; Walker, Kenneth E. ; Li, Li-Sheng ; Huggins, Kevin E.

PDF Url : ADA322379

Report Date : OCT 1996

Pagination or Media Count : 55

Abstract : We have discovered systems of molecules with the architecture of miniaturized triblock copolymers that self assemble into nanostructures highly regular in size and shape. In the system described here, a mushroom-shaped supramolecular structure of about 200 kilodaltons forms by crystallization of the chemically identical blocks in the system. Interestingly, the supramolecular units self organize into films containing one hundred or more layers stacked in polar arrangement. The polar supramolecular material exhibits spontaneous second harmonic generation from infrared to green photons, and a tape-like character with nonadhesive-hydrophobic and hydrophilic- sticky opposite surfaces. The films also have reasonable shear strength, and adhere tenaciously to glass surfaces on one side only. The regular and finite size of the supramolecular units is believed to be mediated by repulsive forces among some of the segments in the triblock molecules. On the other hand, the polar stacking of the mushroom nanostructures might be the system's organization that optimizes space filling in three dimensions. A large diversity of multifunctional materials could be discovered in solids formed by regular supramolecular units in the range of hundreds of kilodaltons. Such supramolecular materials could impact the technologies of sensors, cell substrates, waveguides, membranes, materials coupling in composite structures, solid lubricants, and catalysts, among others.

Descriptors :   *BLOCK COPOLYMERS, COUPLING(INTERACTION), DETECTORS, MOLECULES, SECOND HARMONIC GENERATION, MATERIALS, FILMS, COPOLYMERS, COMPOSITE STRUCTURES, WAVEGUIDES, SUBSTRATES, CRYSTALLIZATION, GLASS, SURFACES, SOLID LUBRICANTS, PHOTONS, TAPES, MEMBRANES, CATALYSTS, INFRARED RADIATION, POLARITY, STACKING, MINIATURIZATION, HYDROPHOBIC PROPERTIES, SHEAR STRENGTH.

Subject Categories : Polymer Chemistry
      Laminates and Composite Materials
      Crystallography
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE