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Functional Three-Dimensional Nanostr...

Zhang, Xu.

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Functional Three-Dimensional Nanostructures Using Colloidal Particles.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Functional Three-Dimensional Nanostructures Using Colloidal Particles./
作者:	Zhang, Xu.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
面頁冊數:	200 p.
附註:	Source: Dissertation Abstracts International, Volume: 78-08(E), Section: B.
Contained By:	Dissertation Abstracts International78-08B(E).
標題:	Mechanical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10583616
ISBN:	9781369622959

Functional Three-Dimensional Nanostructures Using Colloidal Particles.
Zhang, Xu.

Functional Three-Dimensional Nanostructures Using Colloidal Particles. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 200 p.

Source: Dissertation Abstracts International, Volume: 78-08(E), Section: B.

Thesis (Ph.D.)--North Carolina State University, 2016.

With nanotechnologies influencing more aspects of human life and society, there are strong needs to develop facile, scalable and cost-effective three-dimensional (3D) nanofabrication techniques to enable a variety of 3D nanostructures for applications, such as in energy, photonics, and life science. In this dissertation, a facile approach for fabricating 3D hollow nanostructures is investigated with the combination of "top-down" lithography and "bottom-up" colloidal particle self-assembly. By examining the light-particle interactions, the intensity distribution can be tailored and harnessed for 3D nanolithography. Here, I examined the use of light scattering from colloidal particles to fabricate complex hollow nanostructures. In this approach, a single colloidal sphere is illuminated in either normal or oblique directions to create a 3D Mie scattering pattern, which is captured by photoresist in close proximity. No external optical elements are required, and the colloidal elements alone provide the modulation of the optical intensity pattern. The fabricated nanostructures can be designed to have multiple shells, confined volumes, and single top openings, resembling "nano-volcanoes," or complex asymmetric 3D nanostructures by oblique and multiple illuminations. The geometry of such structures is dependent on the scattered light distribution, and can be accurately modeled by examining the light-particle interaction. The hollow nanostructures can be used to trap nanomaterials, and I have demonstrated their ability to trap 50 nm silica nanoparticles. These well-defined surface hollow structures can be further functionalized for applications in controlled drug delivery, nanonozzles and bio-trapping. Colloidal elements with different geometries and material compositions can also be incorporated to examine other light-colloid interactions.

ISBN: 9781369622959Subjects--Topical Terms:

649730
Mechanical engineering.

Functional Three-Dimensional Nanostructures Using Colloidal Particles.
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500 $a Source: Dissertation Abstracts International, Volume: 78-08(E), Section: B.
500 $a Adviser: Chih-Hao Chang.
502 $a Thesis (Ph.D.)--North Carolina State University, 2016.
520 $a With nanotechnologies influencing more aspects of human life and society, there are strong needs to develop facile, scalable and cost-effective three-dimensional (3D) nanofabrication techniques to enable a variety of 3D nanostructures for applications, such as in energy, photonics, and life science. In this dissertation, a facile approach for fabricating 3D hollow nanostructures is investigated with the combination of "top-down" lithography and "bottom-up" colloidal particle self-assembly. By examining the light-particle interactions, the intensity distribution can be tailored and harnessed for 3D nanolithography. Here, I examined the use of light scattering from colloidal particles to fabricate complex hollow nanostructures. In this approach, a single colloidal sphere is illuminated in either normal or oblique directions to create a 3D Mie scattering pattern, which is captured by photoresist in close proximity. No external optical elements are required, and the colloidal elements alone provide the modulation of the optical intensity pattern. The fabricated nanostructures can be designed to have multiple shells, confined volumes, and single top openings, resembling "nano-volcanoes," or complex asymmetric 3D nanostructures by oblique and multiple illuminations. The geometry of such structures is dependent on the scattered light distribution, and can be accurately modeled by examining the light-particle interaction. The hollow nanostructures can be used to trap nanomaterials, and I have demonstrated their ability to trap 50 nm silica nanoparticles. These well-defined surface hollow structures can be further functionalized for applications in controlled drug delivery, nanonozzles and bio-trapping. Colloidal elements with different geometries and material compositions can also be incorporated to examine other light-colloid interactions.
520 $a The refractive indices of naturally occurring materials are limited, and there exists an index gap between indices of air and available solid materials. With many photonics and electronics applications, there has been considerable effort in creating artificial materials with optical and dielectric properties similar to air while simultaneously being mechanically stable to bear load. In the second part of this dissertation, I demonstrated a class of ordered nanolattice materials consisting of periodic thin-shell structures with near-unity refractive index and high stiffness. Using a combination of 3D nanolithography and atomic layer deposition, these ordered nanostructured materials have reduced optical scattering and improved mechanical stability compared to existing randomly porous materials. Using ZnO and Al2O 3 as the building materials, refractive indices from 1.3 down to 1.025 were achieved. The experimental data can be accurately described by Maxwell-Garnett effective media theory, which can provide a guide for index design. The demonstrated low-index, low-scattering, and high-stiffness materials can serve as high-quality optical films in multilayer photonic structures, waveguides, resonators, and ultra-low-k dielectrics.
520 $a Tunable nanostructures are attractive in nanostructure research as they can induce dynamic physical properties in a fundamental way which traditional macroscopic structures could not. Although magnetically tunable microstructures have previously been demonstrated in fluid manipulations, reversible dry adhesives, and cell manipulations, little effort has been put into fabricating and characterizing tunable nanostructures. In addition, existing structures are based mostly on composite polymer materials with embedded nanomaterials, where the magnetic parameters can only be controlled by the species and volume fraction of the magnetic material. In the last part of my dissertation, I propose a fabrication method for tunable periodic nanostructures where the mechanical compliance and magnetic actuation can be independently controlled using standard micro-machining techniques and interference lithography. A fabrication process towards magnetically tunable nanostructures is demonstrated and high-aspect ratio PDMS nanopillar arrays were fabricated with integrated magnetic materials. The integration of the tunable nanostructures with microelectromagnets was also demonstrated. Such tunable nanopillar arrays can find many potential applications, such as in nanofluidic manipulation, dynamic photonic structures, and reversible dry adhesives.
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