Abstract:
The disclosure provides a process for preparing a fluorinated silica hollow nanosphere comprising: providing a mixture comprising water, at least one non-reactive solvent, at least one fluorosilane, at least one water based silica precursor solution, such as sodium silicate, potassium silicate, ammonium silicate or pre-formed silicic acid, and at least one surfactant; shearing the components of the mixture with high shear energy at an energy density of at least 10^6 J/m^3 to form a mini-emulsion; initiating a one-step sol-gel reaction by adjusting the pH to about 4 to 10 and then initiating a one-step sol-gel forming fluorinated hollow silica nanospheres having a particle size of less than about 400nm.
Abstract:
The disclosure provides a process for preparing the functionalized hollow silica particles comprising: providing a core-shell silica particle comprising a template core particle and a silica treatment, wherein the core-shell silica particle has an outer surface; and wherein the silica treatment is prepared using a solvent-based silica precursor; creating a functionalized surface on the core-shell silica particle, wherein the functionalized surface is prepared using sulfonic acid, phosphonic esters, carboxylic acid, amines, epoxides, or boronic acids, and removing the template core particle to form a functionalized hollow silica particle. These inorganic hollow particles are useful as hiding or opacifying agents in coating and molding compositions. They are also useful as photonic band gap or thermal insulation materials.
Abstract:
The disclosure provides a coating composition comprising functionalized hollow silica particles, wherein the functionalized hollow silica particles are prepared by a process comprising: providing a core/shell silica particle comprising a template core particle and a silica treatment, wherein the core/shell silica particle has an outer surface; and wherein the silica treatment is prepared using a water-based silica precursor; creating a functionalized surface on the core/shell silica particle, wherein the functionalized surface is prepared using sulfonic acid, phosphonic esters, carboxylic acid, amines, epoxides, or boronic acids, and removing the template core particle to form a functionalized hollow silica particle. These coating compositions comprise inorganic hollow particles which are useful as hiding or opacifying agents.
Abstract:
The disclosure provides a functionalized hollow silica particle comprising: a core/shell silica particle comprising a template core particle and a silica treatment, wherein the core/shell silica particle has an outer surface; and wherein the silica treatment is prepared using a solvent-based silica precursor; a functionalized surface on the core/shell silica particle, wherein the functionalized surface is prepared using sulfonic acid, phosphonic esters, carboxylic acid, amines, epoxides, or boronic acids, and wherein the template core particle is removed before or after functionation. These inorganic hollow particles are useful as hiding or opacifying agents in coating and molding compositions. They are also useful as photonic band gap or thermal insulation materials.
Abstract:
The disclosure provides a process for preparing a surface functionalized polymeric or polymeric/silica hybrid hollow nanospheres comprising: providing a mixture comprising water, at least one non-reactive solvent, at least one acrylic or styrenic monomer; at least one functionalized acrylic or styrenic monomer; an initiator; at least one surfactant; and, optionally, a polymerizable silane if the polymeric/silica hybrid hollow particles are desired; and shearing the components of the mixture with high shear energy at an energy density of at least 10^6 J/m^3 to form a mini-emulsion; and heating to at least about 50°C, more typically about 50°C to about 90°C; and still more typically about 60°C to about 80°C to form, in one step, a surface functionalized polymeric or polymeric/silica hybrid hollow nanosphere.
Abstract:
The disclosure provides a functionalized hollow silica particle comprising: a core/shell silica particle comprising a template core particle and a silica treatment, wherein the core/shell silica particle has an outer surface; and wherein the silica treatment is prepared using a water-based silica precursor; a functionalized surface on the core/shell silica particle, wherein the functionalized surface is prepared using sulfonic acid, phosphonic esters, carboxylic acid, amines, epoxides, or boronic acids, and wherein the template core particle is removed before or after functionation. These inorganic hollow particles are useful as hiding or opacifying agents in coating and molding compositions. They are also useful as photonic band gap or thermal insulation materials.
Abstract:
The disclosure provides a coating composition having improved opacity comprising a titanium dioxide (TiO 2 ) particle chemically attached to a hollow particle, wherein the hollow particle's size has a volume ratio when compared to the titanium dioxide particle of between 0.008 and 8. These coating compositions comprise inorganic hollow particles which are useful as hiding or opacifying agents.
Abstract:
The disclosure provides a process for preparing the functionalized hollow silica particles comprises: providing a core-shell silica particle comprising a template core particle and a silica treatment, wherein the core-shell silica particle has an outer surface; and wherein the silica treatment is prepared using a water-based silica precursor; creating a functionalized surface on the core-shell silica particle, wherein the functionalized surface is prepared using sulfonic acid, phosphonic esters, carboxylic acid, amines, epoxides, or boronic acids, and removing the template core particle to form a functionalized hollow silica particle. These inorganic hollow particles are useful as hiding or opacifying agents in coating and molding compositions. They are also useful as photonic band gap or thermal insulation materials.
Abstract:
The disclosure provides a process for making hollow inorganic particles comprising: providing a recyclable template particle in an aqueous dispersion, wherein the recyclable template particle is prepared from an organic monomer; coating the recyclable template particle with a water-based silica precursor; maintaining the pH at about 2 to about 10 to form core/shell particles comprising a silica treatment on the recyclable template particle; removing the core/shell particles; and removing the recyclable template particle from the core/shell particles to form a hollow silica particle.
Abstract:
The disclosure provides a coating composition comprising functionalized hollow silica particles, wherein the functionalized hollow silica particles are prepared by a process comprising: providing a core-shell silica particle comprising a template core particle and a silica treatment, wherein the core-shell silica particle has an outer surface; and wherein the silica treatment is prepared using a solvent-based silica precursor; creating a functionalized surface on the core-shell silica particle, wherein the functionalized surface is prepared using sulfonic acid, phosphonic esters, carboxylic acid, amines, epoxides, or boronic acids, and removing the template core particle to form a functionalized hollow silica particle. These coating compositions comprise inorganic hollow particles which are useful as hiding or opacifying agents.