Improving the Physical Properties of Silica Aerogels Using a 3-Step Method

Technology #14266

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Inventors
Professor Gang Chen
Department of Mechanical Engineering, MIT
External Link (meche.mit.edu)
Taofang Zeng
Department of Mechanical Engineering, MIT
Yanjia Zuo
Department of Mechanical Engineering, MIT
Managed By
Jim Freedman
MIT Technology Licensing Officer - Chemicals, Instruments, Consumer Products
Patent Protection

Silica Aerogels and their Preparation

US Patent Pending US 2015-0321921

Silica Aerogels and their Preparation

US Patent 9,073,759

Application

This method produces silica aerogels which have low density, low thermal conductivity, ductility and mechanical integrity.  These aerogels have many uses, but primarily serve as thermal insulators.

Problem Addressed

 A better understanding of controlling the chemical process is needed to further reinforce the mechanical properties of silica aerogels, while retaining their other properties, especially their low thermal conductivities.

Technology

The method proposed involves 3 steps which provides better control of the cluster growth and formation of the gel network in an aerogel.

  1. Hydrolyzing an organosilicate precursor to form silanol groups under acidic conditions.
  2. Condensing the silanol groups under basic conditions with the help of a catalyst to form a polymeric silicate having a diverse range of pore sizes.
  3. Gelling the polymeric silicate.

Advantages

  • Two-to-four times improved ductility of silica aerogels using the 3-step method
  • Better control  of the sol-gel process allows user to achieve desired physical properties (lower thermal conductivity, lower acoustic velocity, lower dielectric constant).