Neutralization-mediated extraction of amphiphilic organic molecules for obtaining high-quality mesoporous alumina.

A solvent extraction method was improved using organic bases such as triethylamine (EtN) that neutralize HCl effectively and stabilize sol-gel derivative alumina frameworks as insoluble species, thereby achieving removal of EOPOEO at a rate higher than 90% to obtain high-quality mesoporous alumina.

Aerosol-assisted synthesis of titania-based spherical and fibrous materials with a rational design of mesopores using PS--PEO.

Surfactant-assisted synthesis is a promising technique for the tailor-made design of highly porous metal oxide based nanomaterials. There has been a demand for the comprehensive design of their morphology, porous structure and crystallinity to extend potential applications using metal oxide based materials such as titania (TiO). However, the porous structure is often deformed and/or destroyed during the process of crystallizing metal oxide frameworks.

Enhanced γ-phase crystallinity of AlO frameworks at the concave surface of PS--PEO templated spherical pores.

The crystallinity of inorganic solids like metal oxides after the porosity design is the crucial factor that should be investigated for enhancing their physicochemical properties. In most cases, metal oxide frameworks around mesopores, that are designed through the supramolecular mediated approach, are resulted to be amorphous. Accordingly, a rational guideline has been required for enhancing the crystallinity of frameworks at such concave surfaces.

A Robust Mesoporous Al O -Based Nanocomposite Catalyst for Abundant NO Storage with Rational Design of Pt and Ba Species.

The nanostructural design of heterogeneous catalysts has often been demanded for assessing synergetic effects, which should be developed further by using high-surface-area porous metal oxide supports. However, such opportunities have been undermined by the poor stability of ordered mesoporous structures. Herein, rational design is demonstrated to obtain nanocomposite catalysts showing improved NO storage properties owing to the presence of Ba species over a well-designed mesoporous alumina (Al O ) support.

Understanding of NOx storage property of impregnated Ba species after crystallization of mesoporous alumina powders.

The regulation of automobile exhaust gas, especially that concerning hazardous nitrogen oxide (called as NOx) becomes stricter year-by-year, which should be urgently corresponded for cleaning the NOx containing emission. According to surface affinity of γ-alumina to metal catalysts and its thermal stability, crystalline γ-alumina has been frequently utilized as catalyst supports showing relatively high specific surface area. From the viewpoint, we consider that highly porous alumina powders prepared using amphiphilic organic molecules are potential as such a catalyst support for improving NOx removing property.

Surfactant-Assisted Mesostructural Variation by the Molecular Structure of Frameworks.

Typical syntheses for the mesostructural design were performed with strategic deviations, being substantially powerful for changing the molecular structure of frameworks, from the synthetic conditions optimized for the preparation of lamellar and 2-d hexagonal mesostructured materials where the frameworks were constructed by aluminophosphate (AlPO) like units with and without organic groups in the molecular scale. A series of the materials such as mesostructured aluminum organophosphonate (AOP) and AlPO type ones were investigated according to the molecular structure and crystallinity of inorganic-organic hybrid and non-hybrid inorganic frameworks. Considering a uniqueness of AlPO based frameworks, a rational insight on strength of interactions between crystalline/amorphous AlPO based units and cationic surfactant molecules was surveyed as one of the most significant factors for understanding the mesostructural variation.

Further Understanding of the Reactivity Control of Bisphosphonates to a Metal Source for Fabricating Highly Ordered Mesoporous Films.

Mesoporous metal organophosphonates having embedded organic functions are a promising platform to hybridize organics and non-siliceous inorganic frameworks in their molecular scale. However, the reactivity between a bisphosphonate and a metal source is dramatically different for their combination and then hampers to construct ordered mesoporous structures even when using amphiphilic organic molecules. By proposing an advanced method to adjust such reactivity, we recently succeeded in fabricating ordered mesoporous aluminum organophosphonate (AOP) films with chemically designable benzene units inside their hybrid frameworks.

Protecting and Leaving Functions of Trimethylsilyl Groups in Trimethylsilylated Silicates for the Synthesis of Alkoxysiloxane Oligomers.

The concept of protecting groups and leaving groups in organic synthesis was applied to the synthesis of siloxane-based molecules. Alkoxy-functionalized siloxane oligomers composed of SiO , RSiO , or R SiO units were chosen as targets (R: functional groups, such as Me and Ph). Herein we describe a novel synthesis of alkoxysiloxane oligomers based on the substitution reaction of trimethylsilyl (TMS) groups with alkoxysilyl groups.

Siloxane-Bond Formation Promoted by Lewis Acids: A Nonhydrolytic Sol-Gel Process and the Piers-Rubinsztajn Reaction.

Siloxane formation reactions of both the nonhydrolytic sol-gel process and Piers-Rubinsztajn reaction can be integrated as Lewis acid promoted siloxane syntheses without involving silanol groups. The former was developed in the field of inorganic materials chemistry and the latter was initiated in polymer chemistry. We have realized both reactions are quite similar, in terms of 1) the nonhydrolytic reaction, 2) the use of alkoxysilanes, 3) the group-exchange reactions competing with the siloxane formation, and 4) the proposed reaction mechanisms.

Aqueous colloidal mesoporous nanoparticles with ethenylene-bridged silsesquioxane frameworks.

Aqueous colloidal mesoporous nanoparticles with ethenylene-bridged silsesquioxane frameworks with a uniform diameter of ∼20 nm were prepared from bis(triethoxysilyl)ethenylene in a basic aqueous solution containing cationic surfactants. The nanoparticles, which had higher hydrolysis resistance under aqueous conditions, showed lower hemolytic activity toward bovine red blood cells than colloidal mesoporous silica nanoparticles.

Usefulness of alkoxyltitanosiloxane for the preparation of mesoporous silica containing a large amount of isolated titanium.

Mesoporous silica containing a large amount of isolated Ti was prepared from an alkoxytitanosiloxane precursor through a hard template method. Isopropoxytris(tris-tert-butoxysiloxy)titanium (((i)PrO)Ti[OSi(O(t)Bu)(3)](3), TS3) was synthesized and TS3 was mixed with mesoporous carbon (CMK-3), a hard template. The mixture was pyrolyzed at 180 °C to form a composite consisting of titanosilica and the hard template.