Abstract: Precipitated silicas including clusters of large primary silica particles having at the surface thereof small primary silica particles, have a specific surface area CTAB (SCTAB) ranging from 60 to 400 m2/g; a cluster average size d50, as measured by XDC grading after ultrasound deagglomeration, such that d50 (nm)>(6214/SCTAB (m2/g)+23; a pore volume distribution such that V(d5-d50)/V(d5-d100)>0.906?(0.0013×SCATB (m2/g)); and a pore size distribution such that Mode (nm)>(4166/SCTAB (m2/g))?9.2; such silicas are useful reinforcing fillers for polymers.

Abstract: Precipitated silicas including clusters of large primary silica particles having at the surface thereof small primary silica particles, have a specific surface area CTAB (SCTAB) ranging from 60 to 400 m2/g; a cluster average size d50, as measured by XDC grading after ultrasound deagglomeration, such that d50 (nm)>(6214/SCTAB (m2/g)+23; a pore volume distribution such that V(d5-d50)/V(d5-d100)>0.906?(0.0013×SCATB (m2/g)); and a pore size distribution such that Mode (nm)>(4166/SCTAB (m2/g))?9.2; such silicas are useful reinforcing fillers for polymers.

Abstract: The invention relates to a mesostructural material, preferably thermally stable, comprising a mineral phase within which nano-scale particles of a metallic oxide are dispersed, selected from a cerium, zirconium, titanium or rare earth metal oxide other than that of cerium. Said oxide comprises at least one metallic element M in a cationic form in a solid solution within the crystalline structure of said oxide. The invention further relates to a method for production of such a material, particularly in the form of heterogeneous catalysts or as a support for catalytic species.

Abstract: The invention concerns a stable aqueous colloidal dispersion with apatite structure, having a pH ranging between 3.5 and 9,5, oblong-shaped with average length between 20 and 200 nm and an equivalent aspect ratio (average length/equivalent diameter ratio) between 5 and 500, and comprising as stabilising agent a compound of formula (I), a compound of formula (II) or a compound of formula (III), such as defined below, optionally in ionized form, or a mixture of said compounds, said colloids with apatite structure corresponding to formula (IV): Ca10-x(HPO4)x(PO4)6-x(J)2-x, wherein x and J are such as defined in claim 1, the stabilising agents corresponding to formula (I), wherein p, X, G1, n, R and m are such as defined in claim 1; the stabilising agents corresponding to formula (II), wherein A, X′″, K, n′ and R′ are such as defined in claim 1; the stabilising agents corresponding to formula (III), wherein X, G1, n and R are such as described in claim 1.