Fabrication of Porous Titania Using Anisotropic Particles

Abstract

Porous materials were prepared by stacking needle-like titania particles. The uniform, needle-like titania particles were synthesized by hydrothermal treatment of titanium hydroxide gel containing ethylenediamine. A seeding technique controlled the particle size of them. The obtained particles were dispersed in aqueous solutions with various pH values and vacuum-filtered to form bulk materials. Porous materials with uniform microstructure were obtained when the pH of the suspension was adjusted to the value suitable for generating electrostatic repulsion between dispersed titania particles. Changing the size of component particles also controlled the pore size of the porous titania.

Electric Charging and Colloid Stability of Fabricated Nedle-Like \(\mbox{TiO}_{2}\) Nanoparticles

“…The set of nine non-linear simultaneous equations (5)(6)(7)(8)(9)(10)(11)(12)14) was solved numerically. The total number density of adsorption sites is Γ 0 = 5 nm −2 as a literature-based value [18].…”

“…Recently, shape controlled needle-like anatase-type titania nanoparticles are well-studied, because of their characteristic chemical and physical properties [9,10]. Nevertheless, the effect of the shape controller on the surface charging and IEP of needle-like TiO 2 nanoparticles has not yet been systematically studied.…”

“…In this context, we synthesized anatase-type spherical and needle-like titania nanoparticles with non-impurities, better to say with known ingredients and additives, by hydrothermal treatment of titanium hydroxide gel [8,9,[11][12][13][14]. Characterizing these non-impurity nanoparticles as a standard model particle will lead us to get the accurate data and the correct understanding of surface charging and dispersion properties of TiO 2 needle-like nanoparticles.…”

Thermal stability improvement of porous alumina prepared from anisotropic boehmite particles

“…35),36) Consequently, if morphologically uniform anisotropic boehmite particles are prepared and arrayed in an ideal form, then porous alumina with a uniform microstructure and high porosity can be obtained. 37), 38) The authors have reported a simple fabrication procedure of porous alumina using needle-like particles. 38) As starting particles for porous alumina fabrication, anisotropic boehmite particles were prepared using the "gelsol" method.…”

Fabrication of porous alumina using anisotropic boehmite particles

“…6),7) The authors reported a fabrication technique of porous ceramics using uniform, anisotropic titania particles. 6) Fabrication of porous titania with a uniform pore structure was achieved simply by stacking the particles using a vacuum filtration of the suspension. We designate the thusprepared porous materials as porous compacts.…”