Nano Science and Technology InstituteNano Science and Technology Institute
Nano Science and Technology Institute 2005 NSTI Nanotechnology Conference & Trade Show
Nanotech 2005
Bio Nano 2005
Business & Investment
Nano Impact Workshop
Index of Authors
Index of Keywords
Keynote Presentations
Confirmed Speakers
Participating Companies
Industry Focus Sessions
Nanotech Expo
Special Symposia
Venue 2005
Press Room
Site Map
Nanotech 2005 At A Glance
Nanotech Proceedings
Nanotechnology Proceedings
Global Partner
nano tech
Supporting Organizations
Nanotech 2005 Supporting Organization
Media Sponsors
Nanotech 2005 Medias Sponsors
Event Contact
696 San Ramon Valley Blvd., Ste. 423
Danville, CA 94526
Ph: (925) 353-5004
Fx: (925) 886-8461

Understanding Medium-Range Order of Fused Silica under High Pressure through Simulations

L.P. Davila, M.-J. Caturla, A. Kubota, B. Sadigh, T. Diaz de la Rubia, J.F. Shackelford, S.H. Risbud and S.H. Garofalini
University of California, Davis, US

fused silica, high pressure, medium-range order, simulations

Silica glass (SiO2) is a technologically important material used in applications including gas transport, laser optics, fiber optics, vacuum systems (He-sensitive windows), silicates and zeolites. Often this glass undergoes extreme conditions of high pressures and temperatures during service. For instance, fused silica lens undergoes drastic structural changes upon large pressure variations in laser optics components. Predictive models can play a key role in the selection and development of materials for such extreme conditions. Our theoretical work here focuses in the study of the structural changes that occur in this well-known candidate material for optics at high pressures using MD simulations. In particular, we are interested in the changes occurring in the medium-range order (MRO) below 10 nm. MD simulations were performed to study the nature of the densification of fused silica under shock pressures. Our simulations using two different methods reproduce the equation of state (EOS) obtained from flyer plate experiments. The elastic-to-plastic transition in the EOS curve is directly related to structural variations exhibited in the ring size distribution of this glass. The ring distribution stays practically unchanged during the elastic compression. However, at the elastic-plastic transition in the EOS curve this distribution begins to change continuously. Those structural changes observed in these simulations could also result in changes in the optical properties of this material. We have performed ab-initio studies of the absorption of the pristine and the modified material.

Back to Program

Sessions Sunday Monday Tuesday Wednesday Thursday Authors

Nanotech 2005 Conference Program Abstract

Gold Sponsors
Nanotech Gold Sponsors
Silver Sponsors
Nanotech Silver Sponsors
Gold Key Sponsors
Nanotech Gold Key Sponsors
Nanotech Ventures Sponsors
Nanotech Ventures Sponsors
Nanotech Sponsors
News Headlines
NSTI Online Community

© Nano Science and Technology Institute, all rights reserved.
Terms of use | Privacy policy | Contact