Picoliter Droplet Generation for Fast Monitoring the Brain Chemistry with Scaled Silicon Nanodyalisis Probe

Yan Zhang, Ari Esters, Oscar Bi, Yurii Vlasov

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

To monitor neurochemicals while minimizing brain damage, a microdialysis system is developed with fluidic channels scaled to 5 μm-radius to fit into 15x50 μm2 silicon neural probe. Droplet generation is utilized to halt Taylor dispersion to achieve high temporal resolution. To extend the stability region for monodisperse droplet generation in such a space-limited probe at ultra-low nL/min flow rates, we varied the T-junction angle, parameter that is typically omitted from consideration for larger channels. In a series of experiments, we found that increase of the T-junction angle increases the critical capillary number separating squeezing and jetting segmentation regimes. With optimized geometry, we demonstrated generation of monodisperse pL-volume droplets in silicon nanofluidic channels. Finite element analysis indicated that these effects are due to interplay between differential pressure and viscous shear forces.

Original languageEnglish (US)
Title of host publication2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems and Eurosensors XXXIII, TRANSDUCERS 2019 and EUROSENSORS XXXIII
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages209-212
Number of pages4
ISBN (Electronic)9781728120072
DOIs
StatePublished - Jun 2019
Event20th International Conference on Solid-State Sensors, Actuators and Microsystems and Eurosensors XXXIII, TRANSDUCERS 2019 and EUROSENSORS XXXIII - Berlin, Germany
Duration: Jun 23 2019Jun 27 2019

Publication series

Name2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems and Eurosensors XXXIII, TRANSDUCERS 2019 and EUROSENSORS XXXIII

Conference

Conference20th International Conference on Solid-State Sensors, Actuators and Microsystems and Eurosensors XXXIII, TRANSDUCERS 2019 and EUROSENSORS XXXIII
CountryGermany
CityBerlin
Period6/23/196/27/19

Keywords

  • Droplet generation
  • Implantable neural probe
  • MEMS
  • Microdialysis
  • Neurochemistry

ASJC Scopus subject areas

  • Process Chemistry and Technology
  • Spectroscopy
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Electronic, Optical and Magnetic Materials
  • Control and Optimization
  • Instrumentation

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