The particularly difficult subject of predicting the swelling behavior of clay minerals is addressed by a combination of mol. dynamics and Monte Carlo sampling techniques. The introduced algorithm essentially mimics the exptl. detn. of the water adsorption isotherm and quant. predicts clay swelling for a montmorillonite-type clay including such details as the occurrence of hydrated states and hysteresis. Furthermore, important insights into the underlying mechanism of clay swelling from the one-layer to the two-layer hydrate are derived. It turns out that, for this case, clay swelling proceeds via the migration of counterions that are initially bound to the mineral surface to the central interlayer plane where they become fully hydrated. The extent of clay swelling strongly depends on the charge locus. This information appears to be transferable to other clay types. [on SciFinder (R)]
Abstract Poly(ethylene glycols) of molecular weights 200 to 20000 were strongly adsorbed on montmorillonite from aqueous solution. Free energies of adsorption calculated from th...
Preface. CHAPTER 1: INTRODUCTION. 1.1 Soil Behavior in Civil and Environmental Engineering. 1.2 Scope and Organization. 1.3 Getting Started. CHAPTER 2: SOIL FORMATION. 2.1 Intro...
The microhydrologic properties involving water content, pressure head, and hydraulic conductivity were measured simultaneously for a silt loam and for a clay loam soil. Large hy...
The most realistic representation of a naturally occurring porous medium is a stochastic set of macroscopic elements in which the values of the three basic hydrogeologic paramet...
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