Synthesis of fibrous nano-silica spheres with controlled particle size, fibre density, and various textural properties

US11242257B2 · kind B2 · utility

Assignee

• TATA INSTITUTE OF FUNDAMENTAL RESEARCH · IN

Inventors

• Vivek Polshettiwar · Nagpur, IN
• Nisha Bayal · Mumbai, IN
• Baljeet Singh · San Francisco, US
• Rustam Singh · Mumbai, IN
• Ayan Maity · Mumbai, IN

Key dates

• Filing date: Apr 1, 2016
• Grant date: Feb 8, 2022
• Expiry date: Jul 4, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/17
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present disclosure provides a method for synthesizing fibrous silica nanospheres, the method can include, in sequence, the steps of: a) providing a reaction mixture comprising a silica precursor, a hydrolyzing agent, a template molecule, a cosurfactant and one or more solvents; b) maintaining the reaction mixture under stirring for a length of time; c) heating the reaction mixture to a temperature for a length of time; d) cooling the reaction mixture to obtain a solid, and (e) calcinating the solid to pro duce fibrous silica nanospheres, wherein desirable product characteristics such as particle size, fiber density, surface area, pore volume and pore size can be obtained by controlling one or more parameters of the method. The present disclosure further provides a method for synthesizing fibrous silica nanospheres using conventional heating such as refluxing the reactants in an open reactor, thereby eliminating the need for microwave heating in a closed reactor or the need for any pressure reactors.