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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >High-Resolution Structural Study of an Electrical Double Layer by Neutron Diffraction
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High-Resolution Structural Study of an Electrical Double Layer by Neutron Diffraction

机译：中子衍射双电层的高分辨率结构研究

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摘要

We present the first high-resolution study of the aqueous structure developed in the electrical double layer region of a colloidal clay system. Our samples were highly oriented vermiculite gels containing isotopically labelled propylammonium counterions: C↓(3)H↓(7)NH↓(3)↑(+) and C↓(3)D↓(7)NH↓(3)↑(+). The gels were prepared with a clay layer spacing of 43.6 #. Time-of-flight neutron diffraction was used to measure the scattering intensity normal to the clay surfaces, from which the neutron scattering density was refined by an inverse Monte Carlo method. Diffraction data from two isotopically distinct samples were fitted simultaneously, thereby allowing us to locate the labelled propyl groups unambiguously. Our results show that the counterions in our vermiculite gels are separated from the clay surfaces by two layers of partially ordered water molecules. In fact, the counterion density reaches a maximum at the center of the interlayer region. The measured structure is therefore at odds with traditional primitive models of the electrical double layer. Such models place the maximum of the counterion density adjacent to the vermiculite clay surfaces, in the so-called Stem layer.
机译：我们提出了在胶体粘土体系的电双层区域中开发的水结构的第一个高分辨率研究。我们的样品是高度定向的ver石凝胶，其中含有同位素标记的丙基铵抗衡离子：C↓（3）H↓（7）NH↓（3）↑（+）和C↓（3）D↓（7）NH↓（3）↑（ +）。制备的凝胶的粘土层间距为43.6＃。飞行时间中子衍射用于测量垂直于黏土表面的散射强度，然后通过逆蒙特卡洛方法对中子散射密度进行细化。同时拟合了两个同位素不同样品的衍射数据，从而使我们能够明确地定位标记的丙基。我们的结果表明，our石凝胶中的抗衡离子被两层部分有序的水分子与粘土表面隔开。实际上，抗衡离子密度在层间区域的中心达到最大值。因此，所测量的结构与双电层的传统原始模型不一致。这种模型将最大的抗衡离子密度放在place石粘土表面附近，即所谓的茎层中。

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