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arXiv 1504.06951math.AP
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一维电荷守恒Poisson-Boltzmann方程的边界层解

Boundary Layer Solutions of Charge Conserving Poisson-Boltzmann Equations: One-Dimensional Case

Chiun-Chang Lee, Hijin Lee, YunKyong Hyon, Tai-Chia Lin, Chun Liu

摘要:

对于多物种离子,我们研究了有限一维(1D)空间域上电荷守恒Poisson-Boltzmann(CCPB)方程[50](具有小参数λ)的边界层解,该边界层解受到具有可变系数的Robin型边界条件的影响。此后,1D边界层解意味着,当λ接近零时,解的轮廓在边界点附近形成边界层,并且在内部区域中变得平坦。这些解决方案与双电层有关,在生物学和物理学中有许多应用。严格证明了一维边界层解在内点和边界点的渐近性态。在具有电位间隙(与zeta电位相关)的内部和边界点处的解值(电位)的渐近极限由明确的非线性公式(在经典Poisson-Boltzmann方程中找不到)唯一地确定,该公式可通过数值计算求解。

英文摘要:

For multispecies ions, we study boundary layer solutions of charge conserving Poisson-Boltzmann (CCPB) equations [50] (with a small parameter ǫ) over a finite one-dimensional (1D) spatial domain, subjected to Robin type boundary conditions with variable coefficients. Hereafter, 1D boundary layer solutions mean that as ǫ approaches zero, the profiles of solutions form boundary layers near boundary points and become flat in the interior domain. These solutions are related to electric double layers with many applications in biology and physics. We rigorously prove the asymptotic behaviors of 1D boundary layer solutions at interior and boundary points. The asymptotic limits of the solution values(electric potentials) at interior and boundary points with a potential gap (related to zeta potential) are uniquely determined by explicit nonlinear formulas (cannot be found in classical Poisson-Boltzmann equations) which are solvable by numerical computations.

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