Filter paper
The filter paper is mostly composed of cotton fiber, and different production methods are adopted according to different uses. Because its material is fiber, its surface has countless small holes for liquid particles to pass through, but larger particles cannot pass through. This feature allows liquid and solid substances to be mixed together.
Chromatography
Paper chromatography is based on filter paper as an inert carrier. The filter paper fiber has a strong affinity with water. It can absorb about 22% of the water, and 6-7% of the water exists in the form of hydrogen bonds and cellulose hydroxyl groups. It is relatively difficult to remove under normal conditions. The filter paper fiber is organic Solvent affinity is very weak, so general paper chromatography is actually a combination of filter paper fiber as the stationary phase and organic solvent as the mobile phase. When the mobile phase passes through the sample along the paper, the sampling points of the solute in the water and the organic phase are continuous Distribution, part of the sample moves with the mobile phase, enters the non-solute zone, and then redistributes, and part of the solute enters the stationary phase (water phase) from the mobile phase.
Filter paper is a commonly used filter tool in chemical laboratories. The common shape is round, mostly made of cotton fiber.
