研究目的
To develop a novel quick method for measuring TiO2 (rutile) optical properties and correlate the particle size distribution of the pigment with optical properties as a mathematical model in order to save the time required for the quality analysis.
研究成果
The study concludes that tint strength and tint tone of rutile titania pigment depend significantly on particle size and distribution. A quick method using reflectance and particle size measurements with a mathematical model provides accurate results comparable to traditional methods, saving time and resources. Manufacturers should control particle size for better optical properties.
研究不足
The method uses aqueous slurries, which may not fully correlate with end-use applications in organic solvents due to differences in refractive index. The accuracy depends on proper dispersion and calibration of instruments.
1：Experimental Design and Method Selection:
The study aimed to establish a correlation between particle size and optical properties (tint strength and tint tone) of rutile titania pigment using reflectance and particle size measurements. A mathematical model was developed based on these measurements to replace traditional time-consuming methods.
2：Sample Selection and Data Sources:
Rutile titania pigment samples with varying tint strength and tint tone were used. Samples were prepared by ultrasonic dispersion in water with calgon as a dispersing agent.
3：List of Experimental Equipment and Materials:
Materials included Titanium dioxide pigment (rutile) samples, deionized water, sodium hexa-metaphosphate (calgon). Equipment included ultrasonic sonicator, analytical balance, UV-visible spectrophotometer (Perkin Elmer lambda 35), scanning electron microscope (JEOL JSM-6610), and particle size analyzer (Microtrac S3500 Laser Diffraction Instrument).
4：Experimental Procedures and Operational Workflow:
Samples were prepared at concentrations from 10 to 70 ppm to find optimum concentration (50 ppm) for maximum reflectance at 550 nm. Reflectance was measured using a spectrophotometer with an integrating sphere. Particle size was analyzed using laser diffraction and sedimentation. SEM was used for microstructural analysis.
5：Data Analysis Methods:
Reflectance values and particle size data were used to develop mathematical equations for tint strength and tint tone. Results were compared with traditional ASTM methods using statistical comparison.
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