Analysis of remote detection travel time curves measured from microfluidic channels

作者：Telkki Ville Veikko^*; Zhivonitko Vladimir V

来源：Journal of Magnetic Resonance, 2011, 210(2): 238-245.

DOI：10.1016/j.jmr.2011.03.011

• Remote detection NMR
• Travel time
• Microfluidics
• Poiseuille flow
• Plug flow

Remote detection technique can increase sensitivity of an NMR experiment by several orders of magnitude in microfluidic applications. Travel time experiment is a basic remote detection NMR experiment, which reveals the travel time distribution of the molecules flowing from the encoding coil region to the detector. In this article, we focus on analyzing how flow type (Poiseuille or plug flow), diffusion, dispersion and geometry of the flow channels are manifested in the travel time curves measured from microfluidic channels. We demonstrate that remote detection travel time experiment could be used even as an alternative NMR method for measuring self-diffusion coefficient of a fluid without magnetic field gradients. In addition, we introduce a modified travel time pulse sequence, which removes the signal of unencoded fluid spins as well as the background signal arising from the material inside or close to the detector.

• 出版日期2011-6