Would anyone recommend me any books like Microscale Acoustofluidics? It helps me understand the use of ultrasonic standing waves to separate suspended particles.
Theoretical Microfluidics by Bruus (Oxford University Press) is my favorite introductory book to microfluidics, and it has a very clear chapter on acoustofluidics, starting from the very basics.
The Lab-on-a-Chip Acoutofluidics tutorial series by Henrik Bruus, Jurg Dual, Jeremy Hawkes, Martyn Hill, Thomas Laurell, Johan Nilsson, Stefan Radel, Satwindar Sadhal and Martin Wiklund deliveres a good overview of the fundamentals and the applications: http://pubs.rsc.org/en/results?searchtext=acoustofluidics
There is an excellent review, published in Reviews of Modern Physics in 2011, entitled "Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics", DOI: 10.1103/RevModPhys.83.647.