Due to federal restrictions contained in the current National Defense Authorization Act, citizens of the People's Republic of China-including the special administrative regions of Hong Kong and Macau-as well as citizens of the Islamic Republic of Iran, the Democratic People's Republic of Korea (North Korea), and the Russian Federation, who are not Lawful Permanent Residents ("green card" holders) are prohibited from accessing facilities that support the mission, functions, and operations of national security laboratories and nuclear weapons production facilities, which includes Los Alamos National Laboratory. The successful candidate will develop and screen candidate fluid chemistries that may include: concentrated single- and mixed-salt brines; aqueous and nonaqueous high-density liquid systems; ionic, molecular, or hybrid working fluids; particle-laden and colloidal formulations; CO2-assisted or other multiphase systems; additives, stabilizers, cosolvents, or other components used to control density, viscosity, phase behavior, precipitation, or thermal stability.