Skip to main content

ASU Global menu

Skip to Content Report an accessibility problem ASU Home My ASU Colleges and Schools Sign In
Arizona State University Arizona State University
ASU Library KEEP

Main navigation

Home Browse Collections Share Your Work
Copyright Describe Your Materials File Formats Open Access Repository Practices Share Your Materials Terms of Deposit API Documentation
Skip to Content Report an accessibility problem ASU Home My ASU Colleges and Schools Sign In
  1. KEEP
  2. Theses and Dissertations
  3. ASU Electronic Theses and Dissertations
  4. Thermal storage and transport in colloidal nanocrystal-based materials
  5. Full metadata

Thermal storage and transport in colloidal nanocrystal-based materials

Full metadata

Description

The rapid progress of solution-phase synthesis has led colloidal nanocrystals one of the most versatile nanoscale materials, provided opportunities to tailor material's properties, and boosted related technological innovations. Colloidal nanocrystal-based materials have been demonstrated success in a variety of applications, such as LEDs, electronics, solar cells and thermoelectrics. In each of these applications, the thermal transport property plays a big role. An undesirable temperature rise due to inefficient heat dissipation could lead to deleterious effects on devices' performance and lifetime. Hence, the first project is focused on investigating the thermal transport in colloidal nanocrystal solids. This study answers the question that how the molecular structure of nanocrystals affect the thermal transport, and provides insights for future device designs. In particular, PbS nanocrystals is used as a monitoring system, and the core diameter, ligand length and ligand binding group are systematically varied to study the corresponding effect on thermal transport.

Next, a fundamental study is presented on the phase stability and solid-liquid transformation of metallic (In, Sn and Bi) colloidal nanocrystals. Although the phase change of nanoparticles has been a long-standing research topic, the melting behavior of colloidal nanocrytstals is largely unexplored. In addition, this study is of practical importance to nanocrystal-based applications that operate at elevated temperatures. Embedding colloidal nanocrystals into thermally-stable polymer matrices allows preserving nanocrystal size throughout melt-freeze cycles, and therefore enabling observation of stable melting features. Size-dependent melting temperature, melting enthalpy and melting entropy have all been measured and discussed.

In the next two chapters, focus has been switched to developing colloidal nanocrystal-based phase change composites for thermal energy storage applications. In Chapter 4, a polymer matrix phase change nanocomposite has been created. In this composite, the melting temperature and energy density could be independently controlled by tuning nanocrystal diameter and volume fractions. In Chapter 5, a solution-phase synthesis on metal matrix-metal nanocrytal composite is presented. This approach enables excellent morphological control over nanocrystals and demonstrated a phase change composite with a thermal conductivity 2 - 3 orders of magnitude greater than typical phase change materials, such as organics and molten salts.

Date Created
2015
Contributors
  • Liu, Minglu (Author)
  • Wang, Robert Y (Thesis advisor)
  • Wang, Liping (Committee member)
  • Rykaczewski, Konrad (Committee member)
  • Phelan, Patrick (Committee member)
  • Dai, Lenore (Committee member)
  • Arizona State University (Publisher)
Topical Subject
  • Mechanical Engineering
  • Nanoscience
  • Colloidal Nanocrystals
  • Phase change materials
  • Thermal conductivity
  • Thermal Storage
  • Thermal Transport
  • Nanocrystals
  • Thermal conductivity
  • Nanostructured materials--Thermal properties.
  • Nanostructured materials
  • Heat--Transmission.
Resource Type
Text
Genre
Doctoral Dissertation
Academic theses
Extent
xvi, 124 pages : illustrations (some color)
Language
eng
Copyright Statement
In Copyright
Reuse Permissions
All Rights Reserved
Primary Member of
ASU Electronic Theses and Dissertations
Peer-reviewed
No
Open Access
No
Handle
https://hdl.handle.net/2286/R.I.36446
Statement of Responsibility
by Minglu Liu
Description Source
Viewed on February 29, 2016
Level of coding
full
Note
Partial requirement for: Ph.D., Arizona State University, 2015
Note type
thesis
Includes bibliographical references (pages 109-124)
Note type
bibliography
Field of study: Mechanical engineering
System Created
  • 2016-02-01 07:05:32
System Modified
  • 2021-08-30 01:25:44
  •     
  • 1 year 9 months ago
Additional Formats
  • OAI Dublin Core
  • MODS XML

Quick actions

About this item

Overview
 Copy permalink

Explore this item

Explore Document

Share this content

Feedback

ASU University Technology Office Arizona State University.
KEEP

Contact Us

Repository Services
Home KEEP PRISM ASU Research Data Repository
Resources
Terms of Deposit Sharing Materials: ASU Digital Repository Guide Open Access at ASU

The ASU Library acknowledges the twenty-three Native Nations that have inhabited this land for centuries. Arizona State University's four campuses are located in the Salt River Valley on ancestral territories of Indigenous peoples, including the Akimel O’odham (Pima) and Pee Posh (Maricopa) Indian Communities, whose care and keeping of these lands allows us to be here today. ASU Library acknowledges the sovereignty of these nations and seeks to foster an environment of success and possibility for Native American students and patrons. We are advocates for the incorporation of Indigenous knowledge systems and research methodologies within contemporary library practice. ASU Library welcomes members of the Akimel O’odham and Pee Posh, and all Native nations to the Library.

Number one in the U.S. for innovation. ASU ahead of MIT and Stanford. - U.S. News and World Report, 8 years, 2016-2023
Maps and Locations Jobs Directory Contact ASU My ASU
Copyright and Trademark Accessibility Privacy Terms of Use Emergency COVID-19 Information