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Nano-Mechanical Testing of Colloidal Nanostructures and Self-Assembled Films.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Nano-Mechanical Testing of Colloidal Nanostructures and Self-Assembled Films./
作者:	Patil, Radhika.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	147 p.
附註:	Source: Dissertations Abstracts International, Volume: 83-05, Section: B.
Contained By:	Dissertations Abstracts International83-05B.
標題:	Metals. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28812870
ISBN:	9798494453617

Nano-Mechanical Testing of Colloidal Nanostructures and Self-Assembled Films.
Patil, Radhika.

Nano-Mechanical Testing of Colloidal Nanostructures and Self-Assembled Films. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 147 p.

Source: Dissertations Abstracts International, Volume: 83-05, Section: B.

Thesis (Ph.D.)--Stanford University, 2021.

This item must not be sold to any third party vendors.

Understanding the mechanical behavior of nanostructures is crucial for their use in lightweight, strong, and multifunctional materials. Here, three different colloidal nanocrystals are tested in compression to gain insight into the role of microstructure, structural porosity, surface passivation and roughness, and strain rate on plastic deformation. Single crystal Ag and Cu nanocubes are compressed using in situ scanning electron microscopy to study the effect of surface passivation by the colloidal surfactant ligands on strength. Hollow, single crystal Au-Ag alloy nanoboxes with sub-20 nm wall thickness are found to strain harden. This is related to stacking fault accumulation and interaction which is not observed in solid single crystal nanostructures. In contrast, hollow amorphous cobalt sulfide nanoboxes do not show strain hardening. In addition, deformation and fracture is found to be strain rate dependent. These nanoboxes are self-assembled into lightweight films with pores inside of each nanobox, as well as between neighboring nanoboxes. These films are found to be strain rate independent and similar to granular materials. Finally, I present a workflow for determining the mechanical properties of thin films or other small-scale structures that combines nano-mechanical testing and computational simulations. This approach is validated for the finite element modelling of viscoelastic optically clear adhesive thin films using nanoindentation and rheology experimental data.

ISBN: 9798494453617Subjects--Topical Terms:

601053
Metals.

Nano-Mechanical Testing of Colloidal Nanostructures and Self-Assembled Films.
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520 $a Understanding the mechanical behavior of nanostructures is crucial for their use in lightweight, strong, and multifunctional materials. Here, three different colloidal nanocrystals are tested in compression to gain insight into the role of microstructure, structural porosity, surface passivation and roughness, and strain rate on plastic deformation. Single crystal Ag and Cu nanocubes are compressed using in situ scanning electron microscopy to study the effect of surface passivation by the colloidal surfactant ligands on strength. Hollow, single crystal Au-Ag alloy nanoboxes with sub-20 nm wall thickness are found to strain harden. This is related to stacking fault accumulation and interaction which is not observed in solid single crystal nanostructures. In contrast, hollow amorphous cobalt sulfide nanoboxes do not show strain hardening. In addition, deformation and fracture is found to be strain rate dependent. These nanoboxes are self-assembled into lightweight films with pores inside of each nanobox, as well as between neighboring nanoboxes. These films are found to be strain rate independent and similar to granular materials. Finally, I present a workflow for determining the mechanical properties of thin films or other small-scale structures that combines nano-mechanical testing and computational simulations. This approach is validated for the finite element modelling of viscoelastic optically clear adhesive thin films using nanoindentation and rheology experimental data.
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