Accession Number : ADA621358


Title :   Robust Nanoparticles


Descriptive Note : Final rept. 15 Sep 2011-14 Sep 2014


Corporate Author : MASSACHUSETTS UNIV AMHERST


Personal Author(s) : Emrick, Todd ; Crosby, Al


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a621358.pdf


Report Date : 21 Jan 2015


Pagination or Media Count : 11


Abstract : This project advanced the chemistry of functional nanoparticles and used these particles in advanced materials assembly for the fabrication of nanoparticle-based mesostructures. These hybrid materials possess extremely high inorganic weight fraction, yet benefit from the processibility offered by organic/polymer ligands, and the robustness resulting from ligand cross-linking post-assembly. The project developed a facile evaporative assembly method, termed flow coating, that affords nanoparticle-based ribbons that were studied for their fundamental features including 1) the scope-and-limitations of their dimensions, 2) their conductivity when employing metallic nanoparticles in the assembly, and 3) their propensity to twist into helical structures irrespective of the nanoparticle (or polymer) composition used in the assembly. The ribbons identified in this project exhibited force-extension behavior described by a combination of elastic and surface energies. The macroscale mechanical properties of these ribbons, along with the inherent nanoscale properties of the particles, provide tunable multi-functionality and open numerous opportunities for applications in sensing, self-healing, and mechanical reinforcement applications.


Descriptors :   *ELASTIC PROPERTIES , *HELICAL SPRINGS , *NANOPARTICLES , *SURFACE TENSION , CHEMICAL VAPOR DEPOSITION , COVALENT BONDS , CROSSLINKING(CHEMISTRY) , EVAPORATION , FABRICATION , FLOW , HYBRID SYSTEMS , LIGANDS , LINEARITY , LOADS(FORCES) , MECHANICAL PROPERTIES , QUANTUM DOTS , SELF ASSEMBLED MONOLAYERS , STIFFNESS , STRETCH FORMING , SURFACE CHEMISTRY , SURFACE ENERGY , THERMAL CONDUCTIVITY , THICKNESS , TUNING


Subject Categories : Polymer Chemistry
      Miscellaneous Materials
      Electricity and Magnetism
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE