A Simple Approach in the Synthesis of Geometrically Tunable Nano-size Hollow Silicate Particles and the evaluation for T
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A Simple Approach in the Synthesis of Geometrically Tunable Nano-size Hollow Silicate Particles and the evaluation for Thermal Energy Saving Applications Rudder T. Wu1, Raymond V.Rivera-Virtudazo2, and Takao Mori1 1 Atomic Network Materials Group, International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044 Japan 2 Global Research Center for Environment and Energy Based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS), Namiki, Tsukuba, Ibaraki 305-0044 Japan ABSTRACT A simplified procedure of synthesizing nano-sized hollow silicate particles (NHSPs) of 80-200 nm in average diameter and approximately 30 nm in wall thickness via (soft template) soluble-poly(methacrylic acid) sodium salt (NaPMA) is presented here. The process is easily scalable and can be carried out at ambient temperature. When deposited as thin (nanolayer) film, NHSPs show good transparency in visible spectra range and good sorption of CO2 for thermal energy efficiency especially in the field of thermal insulation application. INTRODUCTION For the past decades, interest in nanotechnology has been making a ground-breaking impact on various science, engineering, and commercial sectors [1]. According to the reports, nanotechnology application can improve vital characteristics especially in building materials, such as strength, durability, and thermal related properties [1]. Porous / nano-size hollow silicate nanoparticles (NHSPs) are nanoporous particles with low density, high porosity, high surface area per pore volume, high gas and liquid sorption properties, mechanical stability and easy functionalization [1]. These make them an ideal for various applications such as sorption of CO2 gas [1, 3] and thermal insulation [4] especially in the building sector. Hence, various synthetic strategies have been reported for fabrication of NHSPs via soft (emulsion and vesicles) and hard templates (commonly used approaches) [2]. However, most NHSPs inherit substantial drawbacks such as having large diameters, inconsistency in size and poor dispersion. Thus, facile and largescale production of NHSPs with well-controlled structure geometry and stable hollow cavity is still a significant challenge. In terms of CO2 capture capacity, the nanoporous sorbent particles have become an exciting topic because most of the research (to date) has focused on amines and as-synthesized or calcined mesoporous materials [3]. The challenging part there includes the limitations of amount of amine loading, the availability of active sites for CO2 capture and the requirement of multistep / time-consuming procedures to fabricate sorbent. To overcome these limitations, we have been focusing on the alternative way in developing CO2 sorbent using thermal insulating micro/nanoparticles based on silica-based-porous NHSPs. Silica-based-NHSPs have been attracting significant interest in the fabrication of low dielectric constant (low-K), good transparency with low refractive index (low-n
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