Colloidal solutions coarsely dispersed systems презентация

Zaporizhzhya State Medical University Analytical Chemistry Department COLLOIDAL SOLUTIONS COARSELY DISPERSED SYSTEMS Lecturer: Monaykina Yulia Vitalievna 2016

Disperse system is a system consisting of two or more phases. One of them which mass prevails is named a disperse medium. The other phase (or few phases) being in it in dispersed state in a form of fine particles is named a disperse phase.

Classification of disperse systems Classification of disperse systems 1. According to a disperse phase dispersion degree : coarsely dispersed (particle diameter is more than 10-7 m), fine-grained (particle diameter is 10-7 - 10-9 m) molecular dispersed (particle diameter is less than 10-9 m).

Methods of colloidal solutions preparation Methods of colloidal solutions preparation Dispergation methods (breaking up larger particles to the colloid dispersion degree) Condensation methods (association of atoms, molecules or ions to form colloidal particles).

Colloidal solutions purification methods Colloidal solutions purification methods Dialysis Electrodialysis Ultrafiltration

Structure of colloidal particles Each sol consists of micelles and intermicellar liquid. Micelle is an electrically neutral particle of a disperse phase with the double electrical layer surrounding it.