Quantitative characterization of non-classic polarization of cations on clay aggregate stability.
Quantitative characterization of non-classic polarization of cations on clay aggregate stability.
复制标题
阳离子非经典极化对粘土骨料稳定性的定量表征
DOI：
10.1371/journal.pone.0122460
复制
发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Zhu L
中科院分区：
文献类型：
--
作者：
Hu F;Li H;Liu X;Li S;Ding W;Xu C;Li Y;Zhu L
土壤颗粒间的相互作用受溶液浓度、价态、离子种类和pH值的影响很大，这也会影响团聚体的稳定性和颗粒的迁移。在这项研究中，我们研究了在不同的碱离子（Li+，Na+，K+和Cs+）存在下，在10 −5至10−1 mol L−1的浓度下，粘土团聚体的稳定性。不同离子对粘土团聚体稳定性的影响表现为Cs+>K+>Na+>Li+。我们发现，这不是离子的大小，水合作用，和分散力的影响，在阳离子表面相互作用，但强烈的非经典极化的吸附阳离子，导致这些特定的效果。在这项研究中，每个阳离子物种的非经典偶极矩的非经典极化所产生的估计。通过将非经典偶极矩与经典值进行比较，观察到的吸附阳离子的偶极矩比同一阳离子的经典值大104倍。观察到的非经典的偶极矩急剧增加，电解质浓度的降低。我们的结论是，强非经典极化可以显着抑制扩散层的厚度，从而削弱附近的粘土表面的电场，从而提高粘土骨料的稳定性。即使我们只证明了特定的离子与几种碱离子对团聚体稳定性的影响，我们的研究结果表明，这些影响可能是普遍重要的土壤团聚体稳定性。
Soil particle interactions are strongly influenced by the concentration, valence and ion species and the pH of the bulk solution, which will also affect aggregate stability and particle transport. In this study, we investigated clay aggregate stability in the presence of different alkali ions (Li+, Na+, K+, and Cs+) at concentrations from10−5 to 10−1 mol L−1. Strong specific ion effects on clay aggregate stability were observed, and showed the order Cs+>K+>Na+>Li+. We found that it was not the effects of ion size, hydration, and dispersion forces in the cation–surface interactions but strong non-classic polarization of adsorbed cations that resulted in these specific effects. In this study, the non-classic dipole moments of each cation species resulting from the non-classic polarization were estimated. By comparing non-classic dipole moments with classic values, the observed dipole moments of adsorbed cations were up to 104 times larger than the classic values for the same cation. The observed non-classic dipole moments sharply increased with decreasing electrolyte concentration. We conclude that strong non-classic polarization could significantly suppress the thickness of the diffuse layer, thereby weakening the electric field near the clay surface and resulting in improved clay aggregate stability. Even though we only demonstrated specific ion effects on aggregate stability with several alkali ions, our results indicate that these effects could be universally important in soil aggregate stability.
登录
查看更多内容
影响因子：
9.9
作者：
Das, Manash R.;Borah, Jayanta M.;Mahiuddin, Sekh
通讯作者：
Mahiuddin, Sekh
影响因子：
8.6
作者：
Boström, M;Williams, DRM;Ninham, BW
通讯作者：
Ninham, BW
影响因子：
4.2
作者：
LeBissonnais, Y
通讯作者：
LeBissonnais, Y
DOI：
10.2136/sssaj1978.03615995004200010008x
发表时间：
1978-01-01
影响因子：
2.9
作者：
FRENKEL, H;GOERTZEN, JO;RHOADES, JD
通讯作者：
RHOADES, JD
影响因子：
2.9
作者：
Duiker, SW;Rhoton, FE;Lal, R
通讯作者：
Lal, R