UV-vis liquid phase absorption spectroscopy based method for characterizing thickness of illite microchip layer
A liquid-phase absorption and uv-vis technology, applied in the direction of optical devices, instruments, measuring devices, etc., can solve the problems of no illite microchip thickness report, high equipment cost, and technical difficulty, and achieve low cost of testing equipment , improve efficiency and avoid huge errors
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Embodiment 1
[0027] Take 25mg of purified Jilin Antu illite as a reference sample (particle size between 1~9μm, average particle size less than 5um, almost no quartz in the composition, purity greater than 90wt%), add 100mL water, and prepare a concentration of 0.025wt% illite suspension, magnetically stirred for 15 minutes and then ultrasonically treated for 5 minutes to fully disperse the particles. Take 3mL of the above-mentioned dispersed slurry and add it to a quartz cuvette, and use a UV-visible spectrophotometer for UV-vis liquid phase absorption spectrum test , to obtain its absorbance values at 200nm and 250nm, and then another 3mL slurry was taken for absorbance test again, and the above steps were repeated 5 times to determine the stability of the test results. The 5 absorbance test results at 200nm are: 1.100, 1.121, 1.109, 1.103 and 1.192; the 5 absorbance test results at 250nm are: 0.909, 0.914, 0.906, 0.902 and 0.901. The results show that the absorbance test results have ...
Embodiment 2
[0029] The impact of ball milling process on the thickness of illite microplates was characterized by UV-vis liquid phase absorption spectrum. First, the thickness of the purified illite (reference sample) was calibrated comprehensively by AFM, laser particle size, SEM and TEM, and the thickness of the microchip of purified illite was about 0.30 μm after comprehensive analysis. Put 2g of purified illite (standard sample) into a ball mill jar, then add 100mL of distilled water, and ball mill for 1 to 4 hours at a speed of 1050R / min, wherein the grinding medium is 200g of zirconia balls with a diameter of 5μm and 100g of zirconia balls with a diameter of 2μm . Dilute illite slurry milled for 1 to 4 hours with water to a concentration of 0.025wt%, and then perform UV-vis liquid phase absorption spectrum tests on the above diluted slurries, and their absorbance values at 250nm are: 1.437, 1.513, 1.622 and 1.746. according to h 2 = h 1 ·A λ,1 / A λ,2 , the absorbance value A...
Embodiment 3
[0031] The thickness of illite microflakes after ultrasonic treatment was characterized by UV-vis liquid phase absorption spectrum. First, the thickness of the purified illite (reference sample) was calibrated comprehensively by AFM, laser particle size, SEM and TEM, and the thickness of the microchip of purified illite was about 0.30 μm after comprehensive analysis. Put 0.5g of purified illite (reference sample) into a 50mL beaker, add 25mL of distilled water, and sonicate in a KQ-50DA ultrasonic cleaner (50W, 40KHz) for 2h, 4h and 6h. The operation steps are the same as those in Example 2, and the absorbance at 250 nm of illite suspensions with a concentration of 0.025 wt % for 2 hours, 4 hours and 6 hours of ultrasound are 1.04, 1.07 and 1.11, respectively. according to h 2 = h 1 ·A λ,1 / A λ,2 , the absorbance value A of the 0.025wt% illite standard sample suspension in Example 1 250nm,1 (0.906) into the equation to obtain the microchip thickness of illite samples ultr...
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