Publications

Results 26–39 of 39
Skip to search filters

Quantum Nanofabrication: Mechanisms and Fundamental Limits

Wang, George T.; Coltrin, Michael E.; Lu, Ping L.; Miller, Philip R.; Leung, Benjamin L.; Xiao, Xiaoyin X.; Sapkota, Keshab R.; Leonard, Francois L.; Bran Anleu, Gabriela A.; Koleske, Daniel D.; Tsao, Jeffrey Y.; Balakrishnan, Ganesh B.; Addamane, Sadhvikas A.; Nelson, Jeffrey S.

Quantum-size-controlled photoelectrochemical (QSC-PEC) etching, which uses quantum confinement effects to control size, can potentially enable the fabrication of epitaxial quantum nanostructures with unprecedented accuracy and precision across a wide range of materials systems. However, many open questions remain about this new technique, including its limitations and broader applicability. In this project, using an integrated experimental and theoretical modeling approach, we pursue a greater understanding of the time-dependent QSC-PEC etch process and to uncover the underlying mechanisms that determine its ultimate accuracy and precision. We also seek to broaden our understanding of the scope of its ultimate applicability in emerging nanostructures and nanodevices.

More Details
TYPE SAND Report YEAR 2018
OSTIDOI

Informing hazardous zones for on-board maritime hydrogen liquid and gas systems

Blaylock, Myra L.; Pratt, Joseph W.; Bran Anleu, Gabriela A.; Proctor, Camron P.

The significantly higher buoyancy of hydrogen compared to natural gas means that hazardous zones defined in the IGF code may be inaccurate if applied to hydrogen. This could place undue burden on ship design or could lead to situations that are unknowingly unsafe. We present dispersion analyses to examine three vessel case studies: (1) abnormal external vents of full blowdown of a liquid hydrogen tank due to a failed relief device in still air and with crosswind; (2) vents due to naturally-occurring boil-off of liquid within the tank; and (3) a leak from the pipes leading into the fuel cell room. The size of the hydrogen plumes resulting from a blowdown of the tank depend greatly on the wind conditions. It was also found that for normal operations releasing a small amount of "boil- off" gas to regulate the pressure in the tank does not create flammable concentrations.

More Details
TYPE SAND Report YEAR 2018
OSTIDOI
Results 26–39 of 39
Results 26–39 of 39