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Evolving surface structures.

Hong, Wei.

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Evolving surface structures.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Evolving surface structures./
作者:	Hong, Wei.
面頁冊數:	123 p.
附註:	Source: Dissertation Abstracts International, Volume: 67-05, Section: B, page: 2793.
Contained By:	Dissertation Abstracts International67-05B.
標題:	Engineering, Mechanical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3217762
ISBN:	9780542692796

Evolving surface structures.
Hong, Wei.

Evolving surface structures. - 123 p.

Source: Dissertation Abstracts International, Volume: 67-05, Section: B, page: 2793.

Thesis (Ph.D.)--Harvard University, 2006.

The surface microstructures of solids play an important role in material production and applications. Some surface structures can be related to the mechanical behavior of the bulk materials directly, while still having their uniqueness in contrast to the latter. Limited understanding of these surface structures, especially the formation processes, impedes their application. This thesis investigates the formation mechanisms of several types of microstructures on solid surfaces, and possible ways to manipulate the structures.

ISBN: 9780542692796Subjects--Topical Terms:

783786
Engineering, Mechanical.

Evolving surface structures.
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500 $a Adviser: Zhigang Suo.
502 $a Thesis (Ph.D.)--Harvard University, 2006.
520 $a The surface microstructures of solids play an important role in material production and applications. Some surface structures can be related to the mechanical behavior of the bulk materials directly, while still having their uniqueness in contrast to the latter. Limited understanding of these surface structures, especially the formation processes, impedes their application. This thesis investigates the formation mechanisms of several types of microstructures on solid surfaces, and possible ways to manipulate the structures.
520 $a A vicinal surface may form stripes of terraces, separated by monolayer steps. The steps interact through an elastic field. The elastic interaction can be attractive or repulsive, depending on the stress state. In equilibrium, when the steps are repulsive to each other, they tend to be equally spaced; when they have attractions, the equal-spaced state is unstable, and they tend to bunch together forming clusters of steps. During deposition, however, the attachment barriers on different steps and/or on different side of a step come into the scene by kinetically affect the growth speed of the steps. Interplay of the elastic effect and the kinetic effect results in various growth modes of the vicinal surface. We develop an analytical model that takes both elastic fields and kinetic barriers into account. Linear perturbation is used to delineate the regimes of various growth modes.
520 $a Adsorbed on a solid surface, molecules or atoms can also form 2D patterns on the surface. Adsorbates on a solid surface carry electric dipole moments. The dipolar interactions, together with thermodynamic forces, drive the motion of the adsorbates. Guidance of such motion is made possible by introducing an external electric field. We develop a model that incorporates the thermodynamic behavior of the adsorbates, the dipole-dipole and dipole-substrate interactions, as well as the influence of external electric fields. A new technique of manipulating the molecular motion on a solid surface by controlling the embedded electrodes is envisioned.
520 $a The last part of the thesis analyzes the wrinkles in a stiff film on a compliant substrate. A full nonlinear model is constructed, and studied using linear perturbation method. An effective numerical scheme is developed to evolve the 2D patterns of wrinkles in the film.
590 $a School code: 0084.
650 4 $a Engineering, Mechanical. $3 783786
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792 $a 2006
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