美国劳伦斯伯克利国家实验室微流体博士后职位
2014-01-21 09:45 来源: 未知 作者: liuxuehr
The Nuclear Science Division of Lawrence Berkeley National Laboratory (Berkeley Lab) offers an immediate postdoctoral opportunity to study the aqueous chemistry of short-lived transactinides (element with atomic number 104 and above) with one-atom-at-a-time-chemistry as part of the Nitsche Research Group.
The transactinide atoms are produced via nuclear reactions at Berkeley Lab’s 88” cyclotron using the Berkeley Gas-filled Separator (BGS). The back end of the BGS is equipped with a so-called recoil transfer chamber where the produced atoms can be swept out with a gas jet device to a chemical separation. We have designed a chemical device for liquid-liquid separation chemistry, where the gaseous atoms are dissolved in an aqueous phase that is then mixed with an immiscible organic phase.
Depending on the nature of the organic phase the atoms are transferred more or less efficiently from the aqueous into the organic phase. The magnitude of the distribution coefficient between the two phases and the chemical nature of the organic phase allows for a first chemical characterization of certain transactinide elements. Because the half-life of the transactinide elements of interest is very short (2-10 seconds) a new separation device is needed.
We are planning to use a microfluidic device to achieve a very fast and efficient liquid-liquid extraction chemistry. The device encompasses three interconnected components: 1) Transfer of the produced element from the gas-phase atoms into a liquid; 2) extraction of the atoms into the organic phase , and separation of the two phases, and 3) nuclear counting detection of the separated atoms via liquid scintillation counting.
Specific Responsibilities:
• Optimize and finalize the microfluidic device design.
• Work with a MEMS foundry in producing the device.
• Work successfully with a graduate student in designing, manufacturing, and off-line and on-line testing of the device.
• Communicate results in group meetings and participate in professional activities, as appropriate.
• Publish results in peer-reviewed journals.
Qualifications:
• Recent Ph.D. in Chemistry, Chemical Engineering, Physics, Material Sciences, Engineering or related discipline
• Demonstrated experience working with microfluidic systems in one or more of the following areas:
o Designing microfluidic devices for offsite production
o Construction of microfluidic devices using photolithography or micromachining
o Liquid-liquid separation with commercially available microfluidic systems
• Effective communication and interpersonal skills
Note: This is a 1-year postdoctoral appointment with the possibility of renewal based on successful performance, continued funding, and ongoing need. A background check is required.
The transactinide atoms are produced via nuclear reactions at Berkeley Lab’s 88” cyclotron using the Berkeley Gas-filled Separator (BGS). The back end of the BGS is equipped with a so-called recoil transfer chamber where the produced atoms can be swept out with a gas jet device to a chemical separation. We have designed a chemical device for liquid-liquid separation chemistry, where the gaseous atoms are dissolved in an aqueous phase that is then mixed with an immiscible organic phase.
Depending on the nature of the organic phase the atoms are transferred more or less efficiently from the aqueous into the organic phase. The magnitude of the distribution coefficient between the two phases and the chemical nature of the organic phase allows for a first chemical characterization of certain transactinide elements. Because the half-life of the transactinide elements of interest is very short (2-10 seconds) a new separation device is needed.
We are planning to use a microfluidic device to achieve a very fast and efficient liquid-liquid extraction chemistry. The device encompasses three interconnected components: 1) Transfer of the produced element from the gas-phase atoms into a liquid; 2) extraction of the atoms into the organic phase , and separation of the two phases, and 3) nuclear counting detection of the separated atoms via liquid scintillation counting.
Specific Responsibilities:
• Optimize and finalize the microfluidic device design.
• Work with a MEMS foundry in producing the device.
• Work successfully with a graduate student in designing, manufacturing, and off-line and on-line testing of the device.
• Communicate results in group meetings and participate in professional activities, as appropriate.
• Publish results in peer-reviewed journals.
Qualifications:
• Recent Ph.D. in Chemistry, Chemical Engineering, Physics, Material Sciences, Engineering or related discipline
• Demonstrated experience working with microfluidic systems in one or more of the following areas:
o Designing microfluidic devices for offsite production
o Construction of microfluidic devices using photolithography or micromachining
o Liquid-liquid separation with commercially available microfluidic systems
• Effective communication and interpersonal skills
Note: This is a 1-year postdoctoral appointment with the possibility of renewal based on successful performance, continued funding, and ongoing need. A background check is required.
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