Depletion Potential and Adsorption Stability of a Colloidal Particle in Confined Solvent Mixture†

doi:10.7503/cjcu20170331

Abstract

Abstract:

Based on density functional theory and Yvon-Born-Green equation, the expression for depletion potential was derived. The depletion potential and adsorption stability were calculated and investigated via density functional theory for the colloidal particles immersed in the solvent mixture, which was confined by a single wall and in slit pore. The results showed that the volume fraction and the size ratio of the solvents influence significantly the depletion potential in its strength, range and oscillation period. Moreover, the adsorption stability of the colloidal particle at the wall related closely to the volume fraction and size ratio of the solvents. In addition, for the colloidal suspension confined in slit pore, the depletion potential-well of a colloidal particle might show oscillation as the size ratio and the pore width were modulated.

Key words: Mixture, Depletion potential, Density functional theory, Adsorption stability, Depletion potential-well

CLC Number:

O641

TrendMD:

KANG Yanshuang, SUN Zongli, TAN Shanshan. Depletion Potential and Adsorption Stability of a Colloidal Particle in Confined Solvent Mixture^†[J]. Chem. J. Chinese Universities, 2017, 38(12): 2262.

Figures/Tables 6

Fig.1 Comparison of calculated results with those from the Monte-Carlo simulation The lines correspond the results from this work, while the symbols to those from Monte-Carlo simulation.

Fig.2 Depletion potential and its contributions between colloidal particle and the wall under different conditions of relative volume fraction xs(A) The results for the total depletion potential W(z); (B)—(D) the contributions Ws(z), Wm(z) and Wint(z), respectively.

Fig.3 Depletion potential and its contributions between colloidal particle and the wall under different conditions of size ratio Rms(A) The results for the total depletion potential W(z); (B)—(D) the contributions Ws(z), Wm(z) and Wint(z), respectively.

Fig.4 Depletion potential and its contributions between colloidal particle and the slit pore under different conditions of pore width H(A) The results for the total depletion potential W(z); (B)—(D) the contributions Ws(z), Wm(z) and Wint(z), respectively.

Fig.5 Near the single wall, the variation of depletion well ΔW with Rms(A) and ηtot(B)

Fig.6 In the slit, the variation of depletion well ΔW with Rbs(A) and H/σs(B)

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