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Über dieses Buch

This book discusses the ultrasonic synthesis, characterization and application of various nanoparticles, as well as the ultrasonic synthesis of metal and inorganic nanoparticles such as noble metals, transition metals, semiconductors, nanocomposites, alloys and catalysts. In addition, it describes the engineering of micro- and nanosystems using ultrasound-responsive biomolecules. In acoustic cavitation, unique phenomena based on bubbles dynamics, extreme high-temperature and pressure conditions, radical reactions, extreme heating and cooling rates, strong shockwaves, and microstreaming are generated, and under certain conditions, mist generation (atomization of a liquid) is effectively induced by ultrasonic irradiation. These unique phenomena can be used to produce various high-performance functional metal and inorganic nanoparticles.

Nanoparticles and nanomaterials are key materials in advancing nanotechnology and as such ultrasound and sonochemical techniques for producing nanoparticles and nanomaterials have been actively studied for the last two decades. Although a few professional books related to “ultrasound” and “nanomaterials” have been published, these mainly target professional researchers. This book covers this topic in a way that appeals to graduate students, researchers and engineers.



Chapter 1. Chemical and Physical Effects of Acoustic Bubbles

During acoustic cavitation which comprises sequence of nucleation, growth, and collapse of bubbles, physical effects due to shockwaves, micro-jets, strong micro-stirring, etc. are produced. In addition, when bubbles were adiabatically collapsed, the temperature and pressure in collapsing bubbles attained extreme high temperature and high pressure which cause high-temperature reactions in gas and/or liquid phases of the bubble interface. Various types of radicals are also formed by the pyrolysis of solutes and/or solvents. In this chapter, chemical and physical effects of acoustic cavitation are introduced to understand characteristics of the bubbles formed.
Kenji Okitsu, Francesca Cavalieri

Chapter 2. Synthesis of Metal Nanomaterials with Chemical and Physical Effects of Ultrasound and Acoustic Cavitation

Six synthesis techniques using ultrasound and acoustic bubbles are introduced. As a technique using chemical effects of acoustic bubbles which comprise high-temperature and high-pressure conditions, (1) a pyrolysis technique (pyrolysis of a volatile metal precursor in organic solvent) and (2) a reduction technique (reduction of metal precursor in water) are described for the synthesis of metal nanoparticles. Furthermore, as a technique using or relating physical effects of ultrasound and acoustic bubbles, (3) ultrasound-assisted, (4) sonomechanical-assisted metal displacement reduction, (5) sonoelectrochemical, and (6) ultrasound spray pyrolysis techniques are introduced. These synthetic techniques will affect the characteristics of the metal nanoparticles and nanomaterials synthesized.
Kenji Okitsu, Francesca Cavalieri

Chapter 3. Synthesis of Micro-nanoparticles Using Ultrasound-Responsive Biomolecules

The ultrasonic crosslinking of biomacromolecules and biomolecules can be exploited to fabricate micro-nanodevices. In particular, biologically relevant molecules and macromolecules are desirable building blocks for engineering biomaterials. Ultrasonic synthesis, modification, and assembly of biomolecules and biomacromolecules enable the tuning of size, composition, degradability, surface properties, and biofunctionality of micro-nanodevices. Recent achievements in engineering of micro-nanodevices using ultrasound-responsive biomolecules such as proteins, amino acids, and phenolic molecules will be discussed in this section. These recent findings highlight the potential use of high- and low-frequency ultrasound techniques to fabricate innovative platforms for biomedical applications.
Kenji Okitsu, Francesca Cavalieri
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