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Filtering by: Creator Choi, Chang-Ho Remove constraint Creator: Choi, Chang-Ho Advisor Chang, Chih Hung Remove constraint Advisor: Chang, Chih Hung

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  • Synthesis of colloidal metal oxide nanocrystals and nanostructured surfaces using a continuous flow microreactor system and their applications in two-phase boiling heat transfer

    Creator:
    Choi, Chang-Ho
    Abstract:
    Metal oxide nanocrystals have attracted significant interests due to their unique chemical, physical, and electrical properties which depend on their size and structure. In this study, a continuous flow microreactor system was employed to synthesize metal oxide nanocrystals in aqueous solution. Assembly of nanocrystals is considered one of the most...
    Resource Type:
    Dissertation
    Full Text:
    ABSTRACT OF THE DISSERTATION OF Chang-Ho Choi for the degree of Doctor of Philosophy in Chemical

  • Fabrication and characterization of nanostructured surfaces for enhanced heat transfer

    Creator:
    Choi, Changho
    Abstract:
    This objective of this study is to investigate the capability of nanostructured surfaces on dissipating heat flux by performing pool boiling and convective flow boiling. The generation of ultra-high heat flux from high performance electric devices has motivated a number of investigations related to advanced heat transfer especially in two-phase...
    Resource Type:
    Masters Thesis
    Full Text:
    AN ABSTRACT OF THE THESIS OF Changho Choi for the degree of Master of Science in Chemical

  • Experimental Study of Nucleate Boiling Bubble Dynamics and Heat Transfer Enhancement on Printed Bi-functional Surfaces

    Creator:
    David, Michele
    Abstract:
    Boiling heat transfer is studied for its ability to dissipate high fluxes and achieve heat transfer coefficients two orders of magnitude greater than single-phase heat transfer systems. Heater surface enhancement with increased surface area, varied geometry, wettability contrast and micro/nano-structures can further enhance boiling heat transfer performance through bubble nucleation...
    Resource Type:
    Masters Thesis
    Full Text:
    work of Choi and Chang, 2014) .................................................... 20 Figure 3.3

  • Synthesis of Plasmonic-Enhanced Metal-Organic Framework Thin Films and their Infrared Sensing Application

    Creator:
    Ma, Guoheng
    Abstract:
    Transparent and electrically conductive metal oxide nanoparticles have attracted much attention, and can be used to improve the performance of solar cells, transparent electrode materials, and gas sensor technology. Specifically, indium tin oxide (ITO) nanocrystals (NCs) are potentially useful nanomaterials, having technological applications in enhanced sensitivity of optical spectroscopy due...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ Chih-Hung Chang Transparent and electrically conductive metal oxide nanoparticles

  • Low-temperature, Inkjet-printed p-Type Copper(I) Iodide-based Thin-Film Transistors

    Creator:
    Gorecki, Jenna Y.
    Abstract:
    Inkjet-printed p-type copper(I) iodide-based TFTs were successfully fabricated. As-printed copper(I) halide semiconductor films, such as CuI, CuBrI, and CuClI, were used as p-type active channel layers for TFTs. The entire process of the TFTs fabrication was maintained under 150 °C, which is compatible with flexible plastic substrates and transparent glass...
    Resource Type:
    Masters Thesis
    Full Text:
    grateful to Dr. Chang-ho Choi, who gave me a lot of advice which helped me tremendously throughout my

  • Growth, Characterizations, and Applications of Patterned Nanostructured Thin Film

    Creator:
    Gao, Zhongwei
    Abstract:
    A unique microreactor-assisted nanomaterial synthesis and printing process was studied for the fabrication of patterned metal oxide nanostructured thin films. The process uses a continuous flow microreactor to control and generate a reactive chemical flux that was transported to a patterned microfluidic channel. The microreactor-assisted nanomaterial synthesis process can generate...
    Resource Type:
    Dissertation
    Full Text:
    . Wei Wang, Dr. Yu-Wei Su, Dr. Katherine Han, Dr. Chang-Ho Choi, Dr. Paravee Vas-Umnuary, Dr. Dick

  • Inkjet-Printed Metal Halide Semiconductors for Wearable Electronics

    Creator:
    Li, Shujie
    Abstract:
    There is an emerging interest in developing wearable electronics as a platform, which provides the flexibility of a wearable while maintaining its promising functionality as smart textiles. Metal-halide semiconductors are attractive materials with tunable optical and electrical properties. Researchers have widely studied and applied it for advanced photonics and optoelectronic...
    Resource Type:
    Dissertation
    Full Text:
    approved: ______________________________________________________ Chih-Hung Chang There is an

  • Investigate Novel Inkjet Printing of High Performance Silica-based Nanostructured Anti-Reflection Coatings

    Creator:
    Holzgang, Harrison Robert
    Abstract:
    Anti-reflective coatings are applied to substrates to increase the transmittance of light in the visible range of wavelength 400 – 800 nm through the substrate by changing the refractive index at the surface and directing more light through the substrate rather than being reflected away. This project investigated the possibility...
    Resource Type:
    Honors College Thesis
    Full Text:
    : ______________________________________________________ Chih-Hung Chang Anti-reflective coatings are applied to substrates to increase the

  • Iron Chalcogenide-based Thin Films Fabricated by Inkjet Printing

    Creator:
    Fang, Zhen
    Abstract:
    Digital printing techniques offer several advantages in manufacturing electronics such as direct writing of materials, reduction of chemical waste, and scalability. In particular, printing can significantly simplify manufacturing processes by directly defining the channel area, the gate, and the source and drain contacts, allowing for lower costs and higher throughput...
    Resource Type:
    Masters Thesis
    Full Text:
    Chalcogenide-based Thin Films Fabricated by Inkjet Printing Abstract approved: Chih-Hung Chang

  • Investigation of solution-based processes for functional metal oxides : printing, nanostructures, and applications

    Creator:
    Han, Seung-Yeol
    Abstract:
    The various solution-based processes, spin coating, inkjet printing, microreactor assisted nanoparticle deposition (MANDTM) and spin-successive ionic layer absorption and reaction (Spin-SILAR) were used to demonstrate thin film electronics and anti-reflective coatings. Several aspects of thin film transistors (TFTs) were tested including a range of temperatures, annealing atmosphere, and deposition methods....
    Resource Type:
    Dissertation
    Full Text:
    : _____________________________________________________________________ Chih-hung Chang The various solution-based processes, spin coating, inkjet printing