<p>Sediment occupies the storage capacity of reservoirs and reduces the sustainability of the surface water resource. The countermeasure is simply dredging, but it has not been carried out due to financial reasons, especially in developing countri...
<p>A simple quality management for ceramic slurries using a capillary electrophoresis was proposed. The capillary electrophoresis has a lot of advantages for the slurry component analysis. However, the ability of the quantitative analysis to the s...
Thermal barrier and thermal insulation techniques are strongly required for a comfortable life. This paper firstly reviews conventional techniques such as films to adjust solar radiation and multi-layered glasses. Then, the superior thermal insula...
Journal of Physics: Conference Series 596 Jan 2015 [Refereed]
Hollow silica (SiO2) nanoparticles with tunable shell microstructures were synthesized in ethanol solvent by using a polyelectrolyte as template. The polyelectrolyte template was composed of poly (acrylic acid) (PAA) with small amount of ammonia s...
The ammonia-catalyzed system derived from the decomposition of urea by urease to synthesize hollow silica nanoparticles was proposed. The progress of silica from TEOS using the urea/urease-catalyzed system was first confirmed. Based on these resul...
Hosokawa Powder Technology Foundation ANNUAL REPORT 23(0) 88-95 2015
<p>The micro-structures and derived physical properties of skeletal nanoparticles were investigated using microscopic, macroscopic techniques. A scattering function of hollow silica nanoparticles from a small angle X-ray scattering (SAXS) indicate...
Colloids and Surfaces A: Physicochemical and Engineering Aspects 446 46-49 Apr 2014 [Refereed]
The rapid synthesis of hollow silica nanoparticles based on the CaCO 3 template method is proposed. Typically, it contains two steps for the silica coating on a CaCO 3 template by a sol-gel reaction and template removal by a dilute acid solution. ...
Masayoshi Fuji, Chika Takai, Raymond V. Rivera Virtudazo
Advanced Powder Technology 25(1) 91-100 Jan 2014 [Refereed]
This review mainly focuses on simple template routes for hollow particles and introduces their applications. An inorganic template using inorganic particles is a facile technique to obtain hollow particles with various shapes, sizes, from nano to ...
Advanced Powder Technology 25(2) 621-624 Jan 2014 [Refereed]
Fabrication of a silver nanoparticles (AgNPs) network by only acetone (Ace) vaporization from AgNPs/cellulose acetate (CA)/Ace/1-octanol (Oct) suspension was proposed. When Ace vaporizes from CA/Ace/Oct ternary reaction system, a micro-phase separ...
This paper describes technique to control nanoparticle structure and array. As the first part, a modified inorganic template was introduced to prepare skeletal silica nanoparticles with unique structure composed of silica nanoframe and wide square...
Synthesis of hollow nano silica particles with methyl groups based on inorganic template method. Typically, silica coating on calcium carbonate template is formed via sol-gel reaction, and then template is removed by addition of diluted hydrochlor...
Proceedings of Symposium on Network Polymer 35(2) 84-89 2014
To maintain the temperature of heated or cooled air inside a room, one needs to put thermal insulation on the transparent glass windows where heat most frequently comes and goes. Fibrous materials and gas-foamed plastics provide some insulation du...
Journal of the Research Association of Powder Technology, Japan 50(9) 618-624 Sep 2013
Novel technique to prepare calcite hollow particles controlling heating process of vaterite hollow particles as base particles has been developed. The vaterite hollow particles, whose shell surface consists of nano-sized particles, were previously...
Journal of the Research Association of Powder Technology, Japan 50(5) 322-331 May 2013
In order to disperse SnO<sub>2</sub> nanoparticle on SiO<sub>2</sub> substrate surface, reaction control of SnO<sub>2</sub> precursor, consideration of interaction between the precursor and SiO<sub>2</sub> surface, and formation of homogeneous rea...
国立大学法人名古屋工業大学先進セラミックス研究センター年報 = Annual report, Advanced Ceramics Research Center, Nagoya Institute of Technology 2 25-28 2013
This article in Japanese reviews our recent paper,"Rapid and high yield synthesis of hollow silica nanoparticles using an NH 4 F catalyst", published in Colloids and Surfaces A: Physicochemical and Engineering Aspects 446, 46-49, (2014) by C. Taka...
Journal of the Research Association of Powder Technology, Japan 49(12) 896-900 Dec 2012
To maintain the temperature of heated or cooled air inside a room, we need to put thermal insulation on the transparent glass windows where heat most frequently comes and goes. Fibrous materials and gas-foamed plastics provide some insulation due ...
R. V. Rivera-Virtudazo, M. Fuji, C. Takai, T. Shirai
Nanotechnology 23(48) Dec 2012 [Refereed]
An innovative type of hollow silicate nanoparticle with a micro/mesoporous shell wall (NSHPMS) was synthesized at room temperature via an eco-friendly double template approach, followed by simple acid reflux. TEM observations of NSHPMSs showed hol...
Raymond V Rivera Virtudazo, Masayoshi Fuji, Chika Takai, Takashi Shirai
Journal of Nanoparticle Research 14(12) Nov 2012 [Refereed]
Physicochemical analysis on the precipitate samples of the cationic cetyltrimethylammonium bromide (CTAB) adsorbed onto nanocube CaCO 3 particles (NcCP) in aqueous ammonia rich (NH 4 + ) solution was initially examined. The amount of CTAB added to...
Colloids and Surfaces A: Physicochemical and Engineering Aspects 404 101-105 Jun 2012 [Refereed]
To maximize excellent property of hollow nanoparticles, it is important to determine physical property of shell because it directly affects functionality of the final product. In this study, hollow silica nanoparticles (HSNPs) with different shell...
Crystal Growth and Design 12(2) 771-776 Feb 2012 [Refereed]
The hollow structure formation mechanism of calcium carbonate particles synthesized by the CO 2 bubbling method has been investigated. Samples were sequentially taken during the bubbling process to be structurally evaluated by X-ray diffraction ...
Hexagonal-faceted zinc oxide (ZnO) microtubes have been synthesized by a simple liquid process using Zinc Layered Hydroxide precursor. The advantages of this new method are synthesis reaction under a relative low temperature and ambient pressure, ...
Journal of the Research Association of Powder Technology, Japan 49(5) 374-377 2012
We developed a novel ceramic forming process by surface hydration of particles through microwave irradiation. In this process, irradiating a green body with microwaves enhances the hydration reaction between water and particle surfaces, creating s...
Journal of the Research Association of Powder Technology, Japan 49(4) 260-266 2012
Effect of pH change on the shell thickness of calcium carbonate hollow particles was investigated. Calcium carbonate hollow particles were synthesized at different pH change rates by Carbon dioxide bubbling into a solution. And influence of pH cha...
国立大学法人名古屋工業大学先進セラミックス研究センター年報 = Annual report, Advanced Ceramics Research Center, Nagoya Institute of Technology 1 29-33 2012
Recently, there has been much interest in the application of Layered Metal Hydroxide (LMH) because of their excellent properties such as ion exchange, layer structure and chemical stability. Interlayer space of LMH c...
Chemistry Letters 40(12) 1346-1348 Nov 2011 [Refereed]
We report skeletal silica nanoparticles using a cubic template whose surface is coated by surfactant. The controlling factors, (a) high acidity of silanol compared to that of surfactant, (b) low affinity between surfactant and organic medium, and ...
Chemistry Letters 40(6) 638-639 May 2011 [Refereed]
Porous microspheres were prepared by a solid-in-oil-inwater (S/O/W) emulsion. Effects of inorganic salt on pore formation were investigated. Sodium chloride (NaCl) is a proper pore inducing agent, and large uniform pores were obtained with additio...
Colloids and Surfaces A: Physicochemical and Engineering Aspects 373(1-3) 152-157 Jan 2011 [Refereed]
A solid-in-oil-in-water (S/O/W) emulsion system has been developed to prepare porous polymeric microspheres. The obtained microspheres showed unique core-shell structure with a dense core and a surface porous layer. The emulsion system has two pro...
We report skeletal silica nanoparticles using a cubic template whose surface is coated by surfactant. The controlling factors, (a) high acidity of silanol compared to that of surfactant, (b) low affinity between surfactant and organic medium, and ...
The manufacturers of traditional brick in Tozeur Tunisia are obliged to very poor and painful life with the production process architectural culture of the town. It must be continued for future. However they are now in face of a severe crisis for ...
Ceramic Transactions 198 159-164 Dec 2007 [Refereed]
Silica/polyisocyanate composites are kind of materials which can be applied to hard coatings and paintings owing to their hardness and excellent weather resistance. In this study, in order to obtain high particle dispersability in organic medium, ...
Colloids and Surfaces A: Physicochemical and Engineering Aspects 292(1) 79-82 Jan 2007 [Refereed]
In order to synthesize highly functionalized organic/inorganic nanocomposites, it is important to improve particles dispersability by surface modification. In this study, a novel technique to design surface of particles on a molecular level was pr...
Advanced Powder Technology 18(1) 81-91 Jan 2007 [Refereed][Invited]
Hollow particles are a newly developing material with the special properties of low density, thermal insulation and distinct optical activity. A number of preparation methods have been proposed in the literature. The polymer bead template method i...
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