The present invention relates to a composition comprising, in a cosmetically acceptable medium: a) composite particles with a mean size of greater than 0.1 m, containing a matrix comprising i) at least one organic material and/or at least one mineral material and ii) at least titanium dioxide; and b) hydrophobic silica aerogel particles. The invention also relates to a cosmetic process for caring for and/or making up human keratin materials, especially bodily or facial skin or the hair, comprising at least the application, to the surface of the keratin material, of a composition as defined previously. The invention also relates to a non-therapeutic cosmetic process for limiting the darkening of the skin and/or improving the color and/or uniformity of the complexion, comprising the application, to the surface of the keratin material, of a composition as defined previously. The invention also relates to a non-therapeutic cosmetic process for preventing and/or treating the signs of ageing of a keratin material, comprising the application, to the surface of the keratin material, of a composition as defined previously.

The present invention relates to a process for preparing an antimicrobial particulate composition. The invention also relates to personal care or hygiene composition comprising an antimicrobial particulate composition obtainable by the process in accordance with this invention. The invention more particularly relates to a process for preparing an antimicrobial metal nanoparticles immobilized in an inorganic porous material and also incorporating these particles in personal care or hygiene compositions. The antimicrobial particulate composition comprises 0.05% to 3% by weight of antimicrobial metal particles and 97 to 99.95% by weight of immobilizer comprising an inorganic porous material selected from zinc oxide, magnesium hydroxide or calcium carbonate.

Zinc oxide compositions as well as techniques for plasmonic enhancement of absorption in sunscreen applications are provided herein. A method includes selecting one or more metal particles to be used in conjunction with one or more zinc oxide particles in a sunscreen composition, wherein said selecting is based on the plasmon resonance frequency associated with each of the metal particles; and embedding the one or more selected metal particles into each of the one or more zinc oxide particles.

Zinc oxide compositions as well as techniques for plasmonic enhancement of absorption in sunscreen applications are provided herein. A method includes selecting one or more metal particles to be used in conjunction with one or more zinc oxide particles in a sunscreen composition, wherein said selecting is based on the plasmon resonance frequency associated with each of the metal particles; and embedding the one or more selected metal particles into each of the one or more zinc oxide particles.

Zinc oxide compositions and methods for embedding oxide particles in a separate suspension particle for sunscreen applications are provided herein. A method includes reducing the size of each of multiple zinc oxide particles in accordance with a predetermined range; selecting one or more suspension particles to be utilized in conjunction with the multiple zinc oxide particles in a sunscreen composition, wherein each of the one or more suspension particles is larger in size than each of the multiple zinc oxide particles, and wherein said selecting is based on the refractive index of each of the one or more suspension particles; and embedding the multiple zinc oxide particles into the one or more suspension particles to create the sunscreen composition.

The invention relates to a compound (1) comprising at least 50% by weight of a functional agent, characterized in that it also comprises a waxy matrix (3), within which said functional agent is dispersed, wherein said compound (1) is solid at room temperature and intended to be dispersed by fluidization and/or solubilization within a cosmetic and/or dermatological composition to incorporate therein said functional agent, said functional agent being formed from solid particles (2) having undergone a surface treatment resulting in a reductions in the absorption capacity of the waxy matrix (3) by said treated solid particles (2), as compared to untreated solid particles of the same nature. The invention also relates to a formulation of cosmetic and/or dermatological compositions.