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http://hdl.handle.net/11375/21361
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DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Shi, A.-C. | - |
dc.contributor.author | Sun, Youhai | - |
dc.date.accessioned | 2017-05-04T16:52:38Z | - |
dc.date.available | 2017-05-04T16:52:38Z | - |
dc.date.issued | 2007 | - |
dc.identifier.uri | http://hdl.handle.net/11375/21361 | - |
dc.description.abstract | <p> Block copolymers are a class of soft materials which can self-assemble into a variety of ordered structures. One method to induce new structures is the application of an external field such as an electric field. Previously, studies of the field-induced phase transitions are based on the assumption that the structural change follows certain symmetry pattern or simply using real-space numerical methods. The goal of the current project is to develop a simple analytic method to predict the structural change. Our approach is based on a linear response theory, in which the external field is taken as a perturbation and the lowest-order contribution to the solution is computed. We applied our method to the Landau-Brazovskii theory which is valid close to the order-disorder transition point of diblock copolymers. The result shows that there will be an additional term to the order parameter as a response to the external field. The structural change can be predicted by a new Fourier expansion of the order parameter. As an example, we examined the structural change of a body-centered cubic phase under an applied electric field.</p> | en_US |
dc.language.iso | en_US | en_US |
dc.subject | field-induced, phase transitions, block copolymers, soft materials, ordered structures, linear response theory | en_US |
dc.title | Field-Induced Phase Transitions of Block Copolymers | en_US |
dc.type | Thesis | en_US |
dc.contributor.department | None | en_US |
dc.description.degreetype | Thesis | en_US |
dc.description.degree | Master of Science (MSc) | en_US |
Appears in Collections: | Digitized Open Access Dissertations and Theses |
Files in This Item:
File | Description | Size | Format | |
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Sun_Youhai_2007_Masters..pdf | 1.65 MB | Adobe PDF | View/Open |
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