Open Access. Powered by Scholars. Published by Universities.®

Engineering Science and Materials Commons

Open Access. Powered by Scholars. Published by Universities.®

University of Pennsylvania

Nanostructure

Discipline
Publication Year

Articles 1 - 2 of 2

Full-Text Articles in Engineering Science and Materials

Nanoparticle-Shelled Bubbles For Lightweight Materials, Teresa Brugarolas Brufau Jan 2014

Nanoparticle-Shelled Bubbles For Lightweight Materials, Teresa Brugarolas Brufau

Publicly Accessible Penn Dissertations

Lightweight materials that are mechanically robust are of great interest in automotive, aerospace, and construction industries. However due to the nature of materials, it is challenging to obtain materials that have high strength, stiffness and toughness, and light weight simultaneously. One approach that tries to address this limitation is the use of composite materials containing hollow microparticles, also known as syntactic foams. The incorporation of hollow microparticles decreases the density of the material at the same time that increases its specific strength. Conventional methods of fabrication of hollow particles involving bulk reactions result in high heterogeneity in geometry as well ...


Computational Modeling Of Geometry Dependent Phonon Transport In Silicon Nanostructures, Drew Cheney Jan 2013

Computational Modeling Of Geometry Dependent Phonon Transport In Silicon Nanostructures, Drew Cheney

Publicly Accessible Penn Dissertations

Recent experiments have demonstrated that thermal properties of semiconductor nanostructures depend on nanostructure boundary geometry. Phonons are quantized mechanical vibrations that are the dominant carrier of heat in semiconductor materials and their aggregate behavior determine a nanostructure's thermal performance. Phonon-geometry scattering processes as well as waveguiding effects which result from coherent phonon interference are responsible for the shape dependence of thermal transport in these systems. Nanoscale phonon-geometry interactions provide a mechanism by which nanostructure geometry may be used to create materials with targeted thermal properties. However, the ability to manipulate material thermal properties via controlling nanostructure geometry is contingent ...