UV protective composition and use thereof
A composition and polymer technology, applied in the field of ultraviolet radiation protection, can solve the problem of reducing the wavelength range of nanoparticles
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Embodiment 1
[0200] Embodiment 1: the preparation of BLT crystal
[0201] has the formula Bi (4-x) La (x) Ti (3-y) Fe (y) o 12 BLT crystals (where x is between 0.1 and 1.5; and where y is between 0 and 2) as UV absorbers were prepared by a solid solution method. Fe doped crystals included five different Fe to Ti molar ratios as follows: 0.0625:2.9375, 0.125:2.875, 0.25:2.75, 1:2 or 1.5:1.5.
[0202] In this method, the constituent metal oxides are mixed together in powder form in order to obtain the desired stoichiometric amounts. Bi with MW of 465.96g / mol 2 o 3 , MW is 325.82g / mol La 2 o 3 , TiO with a MW of 79.87g / mol 2Mix in desired ratios to make a combined BLTO powder of approximately 200 grams. When needed, Fe with a MW of 159.69 g / mol was added 2 o 3 , while reducing the amount of titania, the amount of iron oxide is chosen to provide the desired doping ratio. The combination of metal oxides, which may be referred to as BLTO-Fe powder in the case of the expected iron...
Embodiment 2
[0207] Embodiment 2: determination of crystal structure
[0208] The crystal structure of the doped BLT crystal with a substitution degree of Fe:Ti of 0.25:2.75 prepared above was determined by powder XRD using a Rigaku TTRAX-III X-ray diffractometer. The X-ray source (Cu anode) was operated at a voltage of 40 kV and a current of 30 mA on the filled powder samples. Data were collected in continuous detector scan mode with a step size of 0.02° / step. Diffraction patterns were collected over the 2Θ range from 10° to 65°. The result is as figure 1 , where the pattern of undoped BLT crystals is shown as a solid line, while the pattern of Fe:Ti 0.25:2.75 doped BLT crystals is shown as a dashed line. For both materials, major peaks are seen around 2Θ around 30°, and doping did not significantly affect the crystalline peak characteristics of BLT crystals.
Embodiment 3
[0209] Example 3: Absorbance determination in powders
[0210] The absorbance dependence of the coarse powder in the wavelength range of 200-800 nm was calculated using a Cary 300 UV-Vis spectrophotometer with an integrating sphere detector (Agilent Technologies, Santa Clara, CA, USA).
[0211] Briefly, the absorbance of a sample is qualitatively estimated by subtracting the amount of light reflected from a powder sample collected by the spectrophotometer's integrating sphere detector from the amount of light reflected by a white surface (which reflects all incident light). Since the extent to which light enters the sample and how much it is scattered by the sample is unknown, this measurement provides an absorbance curve of the sample rather than a true quantitative measurement.
[0212] Results showing the absorbance dependence as a function of wavelength determined from diffuse reflectance measurements acquired by the integrating sphere method are presented in figure 2 ...
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