Peptization is a process in which a colloidal system, previously precipitated or coagulated, is redispersed to form a stable colloidal solution. It involves the addition of a peptizing agent (an electrolyte or a specific chemical) that causes the adsorbed ions to be removed from the surface of the precipitate particles, leading to the repulsion of these particles and their subsequent dispersion within the dispersion medium. The process is crucial in various applications, including paint manufacture, food processing, and soil science. It is the reverse of coagulation.
Peptization meaning with examples
- In soil science, peptization explains how clay particles, which had previously clumped together, can disperse in water due to the addition of a peptizing agent like sodium pyrophosphate, improving soil structure and nutrient availability. This allows the soil to aerate better and makes it easier for plants to thrive with their roots being well-distributed.
- Paint manufacturing employs peptization during the pigment dispersion process. Agglomerated pigment particles, after being precipitated during production, are redispersed using a peptizing agent. This ensures a homogenous paint mixture with desirable color and gloss, contributing to enhanced paint quality and performance as applied on surfaces.
- In the laboratory, researchers can peptize freshly precipitated silver chloride by adding a dilute solution of silver nitrate. This reverses the coagulation, allowing the chloride to disperse into a stable colloidal solution, which is then utilized in quantitative analysis, such as halide detection in an unknown sample.
- During the production of ice cream, the peptization process of protein micelles can improve the texture and consistency of the end product. Milk proteins can be rehydrated and redispersed, which results in a smoother, more stable emulsion which in turn creates a desired mouthfeel of the delicious dessert.
- In wastewater treatment, peptization of colloidal organic matter is important for its removal from the aqueous phase. Pre-coagulation of the wastewater followed by peptization ensures the organic material, which were once coagulated in the initial process can then be filtered out, which enables cleaner effluent water for further use or discharge.
Peptization Synonyms
deflocculation dispersion redispersion solubilization (in context of colloids)Peptization Antonyms
aggregation coagulation flocculation precipitationPeptization Crossword Answers
11 Letters
PEPTISATION