Theory of Solvent-Mediated Long Range Force between Colloidal Particles in a Solvent : Cross-Disciplinary Physics
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概要
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A theory is presented for the solvent-mediated force potential between spherical colloidal particles in a solvent. The long range part of the potential Φ^<(sol)>_<ij>(r)=-k_BTΣ_nK^<(n)>d_^<(n)>_id^<(n)>_j1_re^<-z_nr> with the temperature T and the Boltzmann constant k_B, where K^<(n)> and Z_n are determined by the bulk structure of the solvent and d^<(n)>_j is calculated from z_n and the structure of the solvent near the j-species of colloidal particle. A similar result is also obtained for the long range part of the total correlation function ho_j(r) between colloidal- and solvent-particles. It is discussed that d^<(n)>_j is inversely proportional to the isothermal compressibility of the solvent. The application of the theory to the solvent near its critical point gives extremely simple and universal expressions for the asymptotic behaviours of ho_j(r) and Φ^<(sol)>_<ij>(r). This Φ^<(sol)>_<ij>(r) is compared with the van der Waals potential in order to emphasize a role of ^<(sol)>_<ij>(r).
- 社団法人日本物理学会の論文
- 2000-02-15
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