Mobile acoustic streaming based trapping and 3-dimensional transfer of a single nanowire

Diversity of acoustic streaming in a rectangular acoustofluidic field

“…Recently, the authors' research team demonstrated that the acoustic streaming is a very useful means to manipulate nano objects [10][11][12][13]. The mobile acoustic streaming field, generated by a micro vibrating rod, can be used to suck, orientate, position and trap individual nanowires in a noncontact and contact way [10,11], and to rotary drive a single nanowire in water on a substrate [12]. The acoustic streaming field in a droplet on an ultrasonic stage can also be used to concentrate nano objects in a controlled way [13].…”

“…In ultrasonic manipulations, the acoustic streaming is usually a negative factor because it will flush away micro particles trapped by the acoustic radiation force [8,9]. Recently, the authors' research team demonstrated that the acoustic streaming is a very useful means to manipulate nano objects [10][11][12][13]. The mobile acoustic streaming field, generated by a micro vibrating rod, can be used to suck, orientate, position and trap individual nanowires in a noncontact and contact way [10,11], and to rotary drive a single nanowire in water on a substrate [12].…”

Transducer-Plane Streaming Patterns in Thin-Layer Acoustofluidic Devices

“…Understanding the driving mechanisms of acoustic streaming patterns within acoustofluidic devices is important in order to precisely control it for the enhancement or suppression of acoustic streaming for applications such as particle/cell manipulation [1-8], heat transfer enhancement [9][10][11][12], noncontact surface cleaning [13][14][15][16][17], microfluidic mixing [18][19][20][21][22][23][24][25][26][27], and transport enhancement [28][29][30][31][32][33][34][35].…”

“…INTRODUCTION Acoustic streaming is steady fluid motion driven by the absorption of acoustic energy due to the interaction of acoustic waves with the fluid medium or its solid boundaries. Understanding the driving mechanisms of acoustic streaming patterns within acoustofluidic devices is important in order to precisely control it for the enhancement or suppression of acoustic streaming for applications such as particle/cell manipulation [1-8], heat transfer enhancement [9-12], noncontact surface cleaning [13][14][15][16][17], microfluidic mixing [18][19][20][21][22][23][24][25][26][27], and transport enhancement [28][29][30][31][32][33][34][35].In most bulk micro-acoustofluidic particle and cell manipulation systems of interest, the acoustic streaming fields are dominated by boundary-driven streaming [36], which is associated with acoustic dissipation in the viscous boundary layer [37]. Theoretical work on boundary-driven streaming was initiated by Rayleigh [38], and developed by a series of modifications for particular cases [39][40][41][42][43][44], which have paved the fundamental understanding of acoustic streaming flows.…”

Modeling and analysis of the droplet-ultrasonic stage system for nano concentration

“…The conventional applications of acoustic streaming include cleaning [7], dispersion [7], mixing [8], non-contact driving [9], etc. Recently, acoustic streaming is applied to trap, position, orientate and rotate nanowires [6,[10][11][12], and concentrate nano entities [13,14]. And this technology is termed ultrasonic nano manipulation [5].…”