Mie resonance anti-counterfeiting product based on hollow structure blue TiO2 and anti-counterfeiting method of Mie resonance anti-counterfeiting product

[0034] A monodisperse blue TiO with hollow structure 2 The preparation method of material comprises the following steps:

[0035] Step 1, a certain amount of tetraethyl orthosilicate is mixed with absolute ethanol and deionized water and stirred evenly, the volume ratio of ethanol to tetraethyl orthosilicate is 26:1, deionized water and tetraethyl orthosilicate The volume ratio is 5:1;

[0036] Step 2, add a certain amount of concentrated ammonia water (concentration 26-28wt%) to step 1, the volume ratio of concentrated ammonia water to tetraethyl orthosilicate is 0.75:1, and centrifuge, wash and separate after stirring for 4 hours;

[0037] Step 3, the SiO obtained in step 2 2 Dispersed in an appropriate amount of absolute ethanol for subsequent use, the volume ratio of the volume of absolute ethanol to tetraethyl orthosilicate described in step 1 is 23:1;

[0038] Step 4, to the SiO in step 3 2 Add a certain volume of acetonitrile and an appropriate amount of hydroxypropyl

[0046]A monodisperse blue TiO with hollow structure 2 The preparation method of material comprises the following steps:

[0047] Step 1, mix and stir a certain amount of tetraethyl orthosilicate with absolute ethanol and deionized water, the volume ratio of ethanol to tetraethyl orthosilicate is 20:1, deionized water and tetraethyl orthosilicate The volume ratio is 4:1;

[0048] Step 2, add a certain amount of concentrated ammonia water (concentration 26-28%) to step 1, the volume ratio of concentrated ammonia water to tetraethyl orthosilicate is 0.77:1, centrifuge and wash and separate after stirring for 4 hours;

[0049] Step 3, the SiO obtained in step 2 2 Dispersed in an appropriate amount of absolute ethanol for subsequent use, the volume ratio of the volume of absolute ethanol to tetraethyl orthosilicate described in step 1 is 23:1;

[0050] Step 4, to the SiO in step 3 2 Add a certain volume of acetonitrile and an appropriate amount of hydroxypropyl cellulose to the su

[0058] A monodisperse blue TiO with hollow structure 2 The preparation method of material comprises the following steps:

[0059] Step 1, mix and stir a certain amount of tetraethyl orthosilicate with absolute ethanol and deionized water, the volume ratio of ethanol to tetraethyl orthosilicate is 25:1, deionized water and tetraethyl orthosilicate The volume ratio is 6:1;

[0060] Step 2, add a certain amount of concentrated ammonia water (concentration 26-28%) to step 1, the volume ratio of concentrated ammonia water to tetraethyl orthosilicate is 0.73:1, centrifuge and wash and separate after stirring for 4 hours;

[0061] Step 3, the SiO obtained in step 2 2 Dispersed in an appropriate amount of absolute ethanol for subsequent use, the volume ratio of the volume of absolute ethanol to tetraethyl orthosilicate described in step 1 is 23:1;

[0062] Step 4, to the SiO in step 3 2 Add a certain volume of acetonitrile and an appropriate amount of hydroxypropyl cellulose to the s