Core Shell Phase Change Materials

Lev Ovadia, HUJI, Faculty of Science, The Institute of Chemistry


Cleantech, Environment, Chemistry and Materials


Green, energy storage, advanced materials, building science,

Technology Readiness Level

4- Technology validated in lab


The Application

Phase change materials (PCMs) are a class of materials that buffer thermal energy by undergoing a phase transition between a liquid and solid (and vice versa) to modulate external temperature variations. PCMs typically have an organic core with a transition temperature designed to match the set point of the desired system which above this point absorbs latent heat and below releases it. PCM materials already are available in products offered by the building and energy industry. In buildings, PCMs are added to paints and general coatings to moderate temperature fluctuations as well as to reduce energy demand by buffering the heat transfer of standard building materials. 

Our Technology

We propose an effective, simple and core-agnostic technique to obtain hermetically closed thin shells surrounding the organic core. In such a scenario, the outer shell does not melt at the respective operating temperatures and therefore prevents coalescence of microcapsules or leakage of the active PCM. Preliminary data also has indicated improvement across a range of physical parameters.

Our Innovation

  • A process to coat organic microcapsules in near ambient conditions in an aqueous solution
  • Stable coating is impervious to organic solvents and microcapsules demonstrate improved thermal conductivity, fire retardation, and compatibility with inorganic matrices
  • Allows addition of additives to the core without risk of leakage
  • Treatment solution and precursors are competitive

The Opportunity

PCMs have found wide use in different industries, where they offer value in heat recovery, energy efficiency, heat storage, transport, and more. PCMs in general are of immense interest now to electrical utilities, particularly those involved in renewables (wind and sun are carbon-free but intermittent energy sources) as a method to store latent heat for prolonged periods of time. This coating technology can bring a strong differentiator with premium performance to a field with very narrow distinction between competing vendors.  


Researcher Information: http://chem.ch.huji.ac.il/ovadia/  


Contact for more information:

Matt Zarek
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