Direct detection and measurement of wall shear stress using a filamentous bio-nanoparticle

Research output: Contribution to journal › Article

Abstract

The wall shear stress (WSS) that a moving fluid exerts on a surface affects many
processes including those relating to vascular function. WSS plays an important
role in normal physiology (e.g. angiogenesis) and affects the microvasculature’s
primary function of molecular transport. Points of fluctuating WSS show
abnormalities in a number of diseases; however, there is no established technique for measuring WSS directly in physiological systems. All current methods rely on estimates obtained from measured velocity gradients in bulk flow data. In this work, we report a nanosensor that can directly measure WSS in microfluidic chambers with sub-micron spatial resolution by using a specific type of virus, the bacteriophage M13, which has been fluorescently labeled and anchored to a surface. It is demonstrated that the nanosensor can be calibrated and adapted for biological tissue, revealing WSS in micro-domains of cells that cannot be calculated accurately from bulk flow measurements. This method lends itself to a platform applicable to many applications in biology and microfluidics.

Details

Original languageEnglish
Pages (from-to)3307-3315
JournalNano Research
Volume8
Issue number10
Early online date25 Aug 2015
Publication statusPublished - Oct 2015