Powders dispersed in liquids can behave differently at process temperature and room temperature and could have different particle size distributions. Therefore it might be necessary to know the particle size distribution at higher temperatures. In this article, we will specifically look at Laser Diffraction at elevated temperatures.
Optimized Setup for High-Temperature Sample Analysis
To investigate samples at higher temperatures, the team developed a special setup. Specifically, they designed it to handle temperatures up to 85 °C. First, they placed the 1L dispersion tank using reinforced PVC tubes. These tubes, in particular, are thicker than standard tubing and can endure higher temperatures. Additionally, gold-painted screws securely attach the tubes to the instrument’s measurement cell.
Next, the setup includes a tripod positioned in front of the tank. It holds both a temperature sensor and a 350W heating element, which are immersed in the liquid within the dispersion unit. Moreover, a temperature controller precisely regulates the sensor and heating element to maintain accurate conditions. To ensure efficiency, the team isolated the measurement cell with Styrofoam. Furthermore, they packed the tank’s visible surface with tailored Styrofoam for additional insulation.
Step-by-Step Guide for High-Temperature Dispersant Measurement
When performing the measurements, place approximately 1 liter of the dispersant into the tank. Ensure the liquid level meets the minimum requirement for the heating element. Next, stir and pump the dispersant through the system while checking the background.
Then, heat the dispersant by turning on the heating element using the temperature regulator. After reaching the desired temperature, let the system stabilize by heating for half an hour. Finally, measure the background to ensure accurate readings.
Heat the sample to the required temperature using a stirring/heating plate. Once heated, homogenize the sample thoroughly with a top stirrer. Then, transfer an aliquot of the sample into the 1-liter tank. Adjust the sample until you achieve the required obscuration. Afterward, measure the sample to obtain the particle size distribution at the higher temperature.
Our conclusion of the week:
Our setup, featuring reinforced PVC and precise temperature control up to 85 °C, ensures accurate laser diffraction measurements. It effectively reveals the dynamic particle size distribution of powders suspended in a liquid at elevated temperatures.
