کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
593144 1453933 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Charged colloidal system: Small ion distribution and effective interaction
ترجمه فارسی عنوان
سیستم کلوئیدی شارژ: توزیع یون های کوچک و تعامل موثر
کلمات کلیدی
کلوئید شارژ شده شبیه سازی دینامیک مولکولی، شارژ موثر، پتانسیل موثر، اثر بسیاری از بدن
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
چکیده انگلیسی

We applied a molecular dynamics simulation technique to charged colloidal systems in order to investigate small ion distribution in thermal equilibrium and to evaluate the effective interaction among macroions. For a system containing a single macroion, screening by counterions was evaluated. The screening becomes more complete for larger macroion charge. In spite of the large inhomogeneity, the chemical potential of small ions is constant for the entire system. Using a thermodynamic integral method, the effective potential (Helmholtz free energy) for two-macroion systems was evaluated as a function of macroion separation distance, and found to be repulsive under normal conditions. Many-body effect is also discussed by comparing the effective potentials for two- and three-macroion systems.

Figure optionsDownload as PowerPoint slideHighlights
► Screening by counterion becomes more complete for larger macroion charge.
► Chemical potential of small ions is constant throughout the system.
► Effective interaction between two macroions of same charge is normally repulsive.
► Effective interaction is similar to the usual models with renormalized charge.
► Many-body effect is attractive for short distance.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 440, 5 January 2014, Pages 34–41
نویسندگان
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