Thesis
Characterization and analysis of acoustic bubbles, Leidenfrost drops, and atomically thin molybdenum disulfide crystals
Washington State University
Master of Science (MS), Washington State University
2015
Handle:
https://hdl.handle.net/2376/101874
Abstract
This thesis is a summary of four projects. The first two projects deal with high-speed characterization and analysis of the interactions between bubbles, drops, and particles. Acoustic bubbles are used to capture microparticles. Oscillation modes of an acoustically actuated bubble are captured by a high-speed camera and further correlated with theoretical attractive secondary radiation force experienced by the particles close to the oscillating bubble. Threshold parameters for particle trapping are determined. The second project investigates the behavior of a Leidenfrost drop at the late stage of evaporation. Both pure and particle-laden water Leidenfrost drops are studied. Unexpected take-off, oscillation, and shoot-up phenomena are observed and explained semi-quantitatively. The other two projects deal with synthesis and characterization of atomically thin molybdenum disulfide (MoS2) crystals. One project prepares MoS2 crystals with different thicknesses using mechanical exfoliation with a polydimethylsiloxane (PDMS) stamp and develops a method to identify different thicknesses with optical microscopy. The influence of lighting conditions on the identification results are studied. The reliability and accuracy of optical thickness identification are verified by atomic force microscopy (AFM). The other project investigates large-area MoS2 crystal growth with chemical vapor deposition (CVD) on a silicon (Si) wafer with 300 nm silicon dioxide (SiO2) coating. Molybdenum trioxide (MoO3) and sulfur (S) are used as the precursors. Parameters for the growth are optimized, including chemical reactants’ amounts, carrier gas flow rate, growth temperature and duration.
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Details
- Title
- Characterization and analysis of acoustic bubbles, Leidenfrost drops, and atomically thin molybdenum disulfide crystals
- Creators
- Zecong Fang
- Contributors
- Feng Zhao (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Electrical Engineering and Computer Science, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525381101842
- Language
- English
- Resource Type
- Thesis