Guided assembly of nanostructures [electronic resource].

Lou, Yucun.
162 p.
Materials science.
Mechanical engineering.
Local subjects:
Penn dissertations -- Mechanical engineering and applied mechanics. (search)
Mechanical engineering and applied mechanics -- Penn dissertations. (search)
System Details:
Mode of access: World Wide Web.
A solid solution can spontaneously separate into phases, e.g. spinodal decomposition, that self assemble into patterns. This process can be guided via external fields to form ordered micro- and nano-structures, e.g., nanodots and nanowires. A Cahn-Hilliard type phase field model is developed that incorporates chemical, interfacial, and elastic energies, including heterogeneous elastic properties, and that couples naturally to externally-imposed mechanical fields. Aggregation in bulk and in thin films under patterned external stress fields are investigated through detailed simulations, which includes a systematic variation of transformation strain, elastic contrast and the magnitude of external load. The patterned external stress fields are shown to directly affect the kinetics and morphology of aggregation through interacting with internal elastic properties. A major contribution of this thesis is the demonstration that the trends observed from simulations can be qualitatively interpreted through Eshelby-type asymptotic estimates for interaction energies.
Thesis (Ph.D. in Mechanical Engineering and Applied Mechanics) -- University of Pennsylvania, 2009.
Source: Dissertation Abstracts International, Volume: 70-06, Section: B, page: 3749.
Adviser: John L. Bassani.
Local notes:
School code: 0175.
Bassani, John L., advisor
University of Pennsylvania.
Contained In:
Dissertation Abstracts International 70-06B.
Access Restriction:
Restricted for use by site license.
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