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Encapsulated particles

  • US 9,675,953 B2
  • Filed: 10/09/2014
  • Issued: 06/13/2017
  • Est. Priority Date: 10/09/2013
  • Status: Active Grant
First Claim
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1. A material composition, comprising:

  • a plurality of particles, wherein each particle comprises a core and a shell encapsulating the core, the shell comprising at least one atomic element not included in the core,wherein the cores have;

    a median maximum dimension that is less than 10 microns, anda median of at least one axial dimension that is in the range of 10 nm to 500 nm, andwherein the shells have;

    a median thickness that is less than 100 nm,a silicon concentration that is in the range of 10% to 50% on the basis of the weight of the shells, andan aluminum concentration that is in the range of 0.01% to 5% on the basis of the weight of the shells,wherein the shells have a ratio of the aluminum concentration to the silicon concentration in the range of 1;

    20 to 1;

    5000 such that the median thickness does not change by more than 10% when measured 24 hours after immersing in water.

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