Abstract

The critical coagulation concentration (CCC) is defined as the minimum concentration of counterions to induce coagulation of colloidal particles. A modified calculation method was proposed to calculate CCC. Comparing the modified calculation method of CCC with the traditional calculation method, the critical condition of modified calculation method is stricter than traditional calculation method. The critical condition of modified calculation method is the maximum value of interaction force that is zero, and the critical condition of traditional calculation method is the maximum value of interaction energy that is zero. The calculation result of CCC based on interaction force is greater than the calculation value based on interaction energy. The CCC value of modified calculation method can ensure particles to coagulate definitely.

Highlights

  • A most important property of a colloidal system is its stability defined by the tendency of the particles to aggregate

  • A modified calculation method is proposed to calculate coagulation concentration (CCC) based on interaction force, the critical condition of this calculation method is stricter, and the calculation results are more accurate

  • Comparing the modified calculation method of CCC with the traditional calculation method, the critical condition of modified calculation method is stricter than traditional calculation method

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Summary

Introduction

A most important property of a colloidal system is its stability defined by the tendency of the particles to aggregate. The DLVO theory involves two major terms: the Van der Waals force/energy based on interparticle distance and the electrostatic double layer force/energy aroused by overlapping of electrical double layer [1,2,3]. The electrostatic double layer force/energy depended on the bulk concentration of electrolyte, and the critical coagulation concentration (CCC) is one of the most significant characteristics of a colloidal dispersion. It is defined as the minimum concentration of counterions to induce coagulation of colloidal particles, and it is often applied to assess the status of a colloidal dispersion [5,6,7,8,9]. A modified calculation method is proposed to calculate CCC based on interaction force, the critical condition of this calculation method is stricter, and the calculation results are more accurate

Traditional Calculation Method of CCC by Interaction Energy
Modified Calculation Method of CCC by Interaction Force
Comparison of Two Calculation Methods
Conclusions
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