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University of Pennsylvania

Nanoparticles

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Full-Text Articles in Engineering Science and Materials

Form And Function: X-Ray Scattering And Spectroscopy Of Transition Metal-Based Nanoparticles, Vicky V T Doan-Nguyen Jan 2015

Form And Function: X-Ray Scattering And Spectroscopy Of Transition Metal-Based Nanoparticles, Vicky V T Doan-Nguyen

Publicly Accessible Penn Dissertations

In recent decades, nanoparticles have been found to possess unique, tunable properties with an enormous variety of applications. The atomic and nanoscale structures govern these functional properties, and structural deviations from the bulk, in part, are responsible for the vast technological uses of nanoparticles. This dissertation tackles the understanding of structure in a number of metal, metal phosphide, and metal oxide nanoparticle systems. Additionally, the syntheses of monodispersed nanoparticle systems allow for correlating their structure with functional properties. Real space analysis using pair distribution functions of monometallic (Ni, Pd) nanoparticles of less than 5 nm in diameter revealed a deviation ...


Synthesis And Self-Assembly Of Nanoparticles And Amphiphilic Block Copolymers, Brenda Leonor Sanchez Gaytan Jan 2012

Synthesis And Self-Assembly Of Nanoparticles And Amphiphilic Block Copolymers, Brenda Leonor Sanchez Gaytan

Publicly Accessible Penn Dissertations

Nanocomposite materials exhibit properties that highly depend on the organization of nanoparticles. Currently, the ability to control the arrangement of nanoscale building blocks has become one of the most important issues in the field. In this thesis, I present a unique way to control the arrangement of nanoparticles in polymer matrixes by the self-assembly of amphiphilic block copolymers and nanoparticles. Unique capsule-like assemblies of nanoparticles were formed by controlling the interaction between nanoparticles and a prototypical block copolymer, PAA-b-PS. This layered structure is composed of a polymer core, a polymer shell and nanoparticles encapsulated between the polymer core and the ...