Ref. 2018-34
About the position
A PhD position is available in the Physics of Nanoscale Systems group of the Science & Technology Department at IBM Research – Zurich. Our group studies novel concepts to separate and analyze nanoparticles in liquids. Although nanoparticles are becoming increasingly abundant due to their heavy use in industry, it remains a challenge to detect, manipulate and analyze them. We will contribute novel technology that may be used in the future to assess nanoparticle content quantitatively in solutions.
Inspired by how molecular motors work in biology, we jave developed an artificial Brownian motor to transport and separate nanoscale particles in fluids (Skaug et al., Science, 359, 1505, 2018). We have developed a toolset based on geometry-induced electrostatic trapping and laser scanning interferometric detection that allows us to manipulate and observe nanoparticles in a nanofluidic channel with high temporal and spatial resolution. Using this toolset, we observed and rationalized a reversal in the transport direction of the motors at high frequencies (Schwemmer et al., Phys. Rev. Lett.121, 104102, 2018).
In this previous work we established models that allow us to extrapolate the behavior of these motors for smaller particle sizes. The models predict that particle separation is feasible with an unprecedented resolution of 1 nm in particle radius. Moreover, the method is expected to work for very small nanoparticles such as DNA molecules and proteins. Being able to manipulate, transport and separate such molecules will pave the way for novel bio-medical applications.
For the current position it is planned to explore the physical limits in terms of particle separation resolution and particle detection sensitivity. The student will design and simulate experiments, fabricate devices, and conduct and characterize the experiments. Simulation tools are in place and he or she will be guided initially by experienced researchers in the field.
Requirements
Candidates applying for this position are expected to hold a Master’s degree in Physics, Physical Chemistry or Nanoscience, ideally with a background in colloidal physics, microfabrication or scanning probe methods. Also desired is some proficiency in programming (preferably in Python), a capability and eagerness to learn independently about a new subject, and strong communication and writing skills.
The successful candidate will acquire profound knowledge in nano-particle interactions in liquids, single-particle detection and tracking, soft-matter physics and related physical chemistry, and atomic force microscopy (AFM). The work is embedded in a research group comprising experts in probe microscopy, nano-fabrication, polymer physics, MEMS fabrication, Si technology, self-assembly and micro-fluidics.
Diversity
IBM is committed to diversity at the workplace. With us you will find an open, multicultural environment. Excellent flexible working arrangements enable both women and men to strike the desired balance between their professional development and their personal lives.
How to apply
Please send your application documents including CV, publication list, and a brief cover letter explaining your motivation in a single PDF file. Reference letters are welcome. The position is available immediately. Candidates are invited to send their application documents to
Dr. Armin W. Knoll
Group Leader Nanofabrication
IBM Research – Zurich