Hollow particles are widely used because they have different properties from solid particles, such as low density and high specific surface area. Here, we investigated the effects of the presence or absence of ultrasound irradiation and the amount of ammonia added in the synthesis process of hollow silica particles using calcite nanoparticles as a template. As a result, particles with thicker shells, higher particle density, and smaller specific surface area and pore volume can be synthesized by stirring with a stirrer while being irradiated with ultrasonic waves than by stirring with a stirrer alone. Furthermore, by increasing the amount of ammonia added, particles with thick shells can be synthesized.

Research on coamorphous system has increased in recent years. Coamorphous can be defined as an amorphous composite in which the interaction sites are fixed between two or more components, attracting attention as a new amorphous state to replace solid dispersions. The most difficult aspect of characterizing coamorphous is proving the absence of crystals. It will be important to select correct evaluation methods. In this study, the preparation, evaluation and analytical methods are described in terms of advantages and disadvantages. In addition, applications are presented from own research.

Lanthanide molybdate phosphors, AEu(MoO₄)₂ (AEM; A = Na, K, Rb, and Cs) were successfully synthesized via the hydrothermal method, and their particle morphology was controlled. It was found that the particle morphology of AEM (A = K, Rb, and Cs) changes depending on the amount of AOH added. Due to structural similarity, different particle morphology changes were observed between (1) K and Rb, and (2) Cs. Based on these orientation analyses, it was found that the [Eu(MoO₄)₂] layer exhibits particularly high light absorption efficiency when it is horizontally aligned with respect to the direction of the excitation light irradiation. This suggests that fluorescence efficiency depends not only on the shape and size of the particles but also on their orientation state.

In manufacturing of advanced functional materials, nanoadditives are often used to induced desired functionalities using powder metallurgy method. Although a vast nanoadditives are available, maximization of their full potential is hindered by the inability to control their distribution within a composite matrix. Therefore, there is a need to control the distribution of nanoadditives incorporation, which is feasible using a wet powder integration process via the electrostatic assembly (EA) method. A brief overview of the EA method is provided along with its feasibility in composite particles and granules design are demonstrated. A controlled powder integration using this method could be beneficial toward the fabrication of multiscale advanced composites using a scalable powder-metallurgy-inspired route.