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Method for correcting DLVO formula of interaction potential between colloidal particles

A colloidal particle and formula technology, applied in the field of colloid and interface chemistry, can solve problems such as nonconformity with description, meaningless expressions, and very sensitive distance values.

Pending Publication Date: 2021-10-15
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the existing problem is that in the numerical simulation, according to the classical DLVO formula, both the repulsive potential energy and the gravitational potential energy are very sensitive to the distance between colloidal particles
However, according to the expression of DLVO theory (shown in Equation 2), it is found that when the particle surface distance x=0, the gravitational potential energy V VDW The denominator term R-(a 1 +a 2 )=0, the expression is meaningless; when the particle surface distance xDEL The value increases rapidly, causing the colloidal particles to bounce off due to the sudden increase in repulsive force (as shown in formulas 2 and 3)
None of the above is consistent with the description of the mechanism of action of colloidal particles by the classic DLVO theory

Method used

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  • Method for correcting DLVO formula of interaction potential between colloidal particles
  • Method for correcting DLVO formula of interaction potential between colloidal particles
  • Method for correcting DLVO formula of interaction potential between colloidal particles

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Embodiment 1

[0051] According to the method described in the summary of the invention, taking silver colloid particles as the research object, simulating the random movement process of 200 silver colloid particles in the solution, and verifying the method described in this patent by comparing the correction method of the present invention with the uncorrected system The necessity and rationality of revising the DLVO formula.

[0052] (1) Select metallic silver as the research object, and clarify the values ​​of its various intrinsic parameters, as shown in Table 1.

[0053] Table 1 Intrinsic parameter values ​​of metallic silver

[0054]

[0055] (2) Substitute the above parameter values ​​into the DLVO formula and make V VDW -R,V EDL -R,V total -R Three curves are plotted to clarify the distance value corresponding to the highest energy barrier, that is, R crit = 63nm.

[0056] (3) Determine R crit value, the actual distance between any two particles can be corrected, and the cor...

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Abstract

The invention discloses a method for correcting an interaction potential DLVO formula between particles. The method comprises the following steps: (1) determining intrinsic parameters of a research object; (2) drawing a DLVO curve according to each parameter value, and determining a critical distance value; (3) correcting the distance between any two particles according to the critical distance value; and (4) compiling the correction formula into a simulation program, and traversing all particles until the simulation is finished. The invention provides a necessary and reasonable DLVO formula correction method, so that the related simulation calculation of the colloidal particles conforms to the description of the classical DLVO theory.

Description

technical field [0001] The invention belongs to the technical field of colloid and interface chemistry, and in particular relates to a method for correcting the DLVO formula of the interaction potential between colloid particles. Background technique [0002] DLVO theory is a very classic and important theoretical method in the field of colloid chemistry, which can describe the interaction between colloidal particles in the solution, so as to regulate the stability of the colloidal system. The classic DLVO theory studies the stability and coagulation of colloids from the perspective of the interaction between colloidal repulsion potential energy and gravitational potential energy. Vander Waals attraction. When the repulsive potential energy between particles is numerically greater than the gravitational potential energy and is sufficient to prevent the particles from colliding with each other and bonding due to Brownian motion, the colloidal particles are in a relatively st...

Claims

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Application Information

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IPC IPC(8): G06F30/25
CPCG06F30/25
Inventor 王雪肖伟王建伟王立根施静敏
Owner GRIMAT ENG INST CO LTD
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