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Patent Granted Porous glass is glass that includes pores, usually in the nanometre- or micrometre-range, commonly prepared by one of the following processes: through metastable phase separation in borosilicate glasses (such as in the system SiO2-B2O3-Na2O), followed by liquid extraction of one of the formed phases;[1][2] through the sol-gel process; or simply by sintering glass powder.
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