Dry Nanoparticle Processes for Functional Materials Integration
Powder processing technique supports the development of next-generation materials and products and thus plays an important role on numerous industries such as life science, energy, environment, and information. Drugs, cosmetics, electronic and magnetic ma
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Dry Nanoparticle Processes for Functional Materials Integration Takahiro Kozawa and Makio Naito
Abstract Powder processing technique supports the development of next-generation materials and products and thus plays an important role on numerous industries such as life science, energy, environment, and information. Drugs, cosmetics, electronic and magnetic materials, and phosphors as the application materials are widely used in our lives. Powder processing is located in the center of such advanced technologies. Here, we introduce the fabrication of functional materials by dry nanoparticle processing. The mechanically assisted particle bonding becomes a fundamental technique on the design and fabrication of functional materials. The particle bonding is achieved through the enhanced surface reactivity induced by mechanical energy, in addition to the intrinsic high surface reactivity of nanoparticles. Since this process does not require additional heat treatments, it is an environmentally friendly technique. Its applications for high-performance thermal insulation materials and electrodes of lithium-ion batteries and solid oxide fuel cells will be explained.
Keywords Dry powder processing Nanoparticle bonding Mechanical process Material design
17.1
Introduction
Powder, which is an assemblage of small solid particles, is widely used in a variety of industries because of its convenient properties. The typical advantages of powders are as follows: specific change of solid-state characteristics associated with a particle size reduction, a huge specific surface area, and a dynamic behavior like liquid and gas by a function of proper external forces. In order to develop functional materials, it is important to optimize these powder properties. Recently, particle bonding technology between each fine particle that makes up powders has been T. Kozawa M. Naito (&) Joining and Welding Research Institute, Osaka University, Suita, Japan e-mail: [email protected] © Springer Nature Singapore Pte Ltd. 2019 Y. Setsuhara et al. (eds.), Novel Structured Metallic and Inorganic Materials, https://doi.org/10.1007/978-981-13-7611-5_17
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attracting much attention to increase the functionality. This chapter explains the direct bonding between nanoparticles without any heat treatment or binders and then introduces the application cases for the fabrication of advanced composites by using this dry powder processing.
17.2
Material Design by Nanoparticle Bonding Processes
The various fabrication methods for preparing composite particles have been proposed in solution- and gas-based processes. Here, we introduce the dry nanoparticle bonding process by mechanical method. This method employs the grinding process of particles as a mechanical principle. The surface activity on particles increases with the decrease of particle size by mechanical grinding. Therefore, the preparation of composite particles can be achieved via direct bonding between nanoparticles by using this enhanced surface activ
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