Accession Number : ADA616244


Title :   Engineering Robust Nanocomposite Networks


Descriptive Note : Final rept. 1 Sep 2009-31 Aug 2014


Corporate Author : GEORGETOWN UNIV WASHINGTON DC


Personal Author(s) : Urbach, Jeffrey S


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a616244.pdf


Report Date : 16 Dec 2014


Pagination or Media Count : 16


Abstract : In this grant period we were able to make significant advances in our understanding of a number of issues related to the processing and proper ties of nanocomposite networks. We showed that a non-Brownian suspension of micron scale rods exhibits reversible shear-driven formation of disordered aggregates resulting in dramatic viscosity enhancement at low shear rates. We also developed a new technique, Boundary Stress Microscopy, to quantify the non-uniform surface stresses in sheared collagen gels. In our collaborations with other AFOSR supported research, we were able to show that native silk solutions can for fibers directly as a result of applied shear, that silk e-gels show remarkable elasticity and work hardening, and that the luminous mucous secreted by the marine worm Chaetopterus sp. behaves rheologically as a yield stress gel.


Descriptors :   *ELASTIC PROPERTIES , *FIBER REINFORCED COMPOSITES , *GELS , *NANOSTRUCTURES , BIOPHYSICS , COMPUTERIZED SIMULATION , MECHANICAL PROPERTIES , MICROSCOPY , MOLECULAR DYNAMICS , MUCUS , OPTIMIZATION , QUANTITATIVE ANALYSIS , RHEOMETERS , SHEAR STRESSES , VISCOSITY , WORMS


Subject Categories : Biology
      Laminates and Composite Materials
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE