Organic matter identifies the nano-mechanical properties of native soil aggregates.
Organic matter identifies the nano-mechanical properties of native soil aggregates.
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DOI：
10.1039/c7nr07070e
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发表时间：
2018-01
期刊：
影响因子：
6.7
通讯作者：
S. Andrea Gazze;I. Hallin;Gerry A. Quinn;Edward G. Dudley;G. Matthews;Paul Rees;G. V. Keulen;Stefan H. Doerr;Lewis Francis
中科院分区：
文献类型：
--
作者：
S. Andrea Gazze;I. Hallin;Gerry A. Quinn;Edward G. Dudley;G. Matthews;Paul Rees;G. V. Keulen;Stefan H. Doerr;Lewis Francis
土壤团聚体和土壤有机质（SOM）的空间组织在纳米尺度上的局部变化对于理解土壤组成和周转所涉及的因素至关重要。然而，土壤纳米科学一直受到阻碍，缺乏合适的方法来确定土壤的生物物理特性在纳米空间分辨率与最小的样品制备。在这里，我们介绍了第一次原子力显微镜（AFM）为基础的定量纳米力学映射（QNM）的方法，允许表征的作用SOM控制土壤团聚体的表面纳米机械性能。SOM覆盖导致土壤的粗糙度和表面变异性增加，以及刚度和粘附性能下降。后者还与通过接触角测量和水滴渗透时间（WDPT）测试确定的纳米到宏观润湿性特征相关。因此，原子力显微镜代表了一个理想的定量工具，以补充现有的技术在新兴领域的土壤纳米科学。
Localized variations at the nanoscale in soil aggregates and in the spatial organisation of soil organic matter (SOM) are critical to understanding the factors involved in soil composition and turnover. However soil nanoscience has been hampered by the lack of suitable methods to determine soil biophysical properties at nanometre spatial resolution with minimal sample preparation. Here we introduce for the first time an Atomic Force Microscopy (AFM)-based Quantitative Nano-Mechanical mapping (QNM) approach that allows the characterisation of the role of SOM in controlling surface nano-mechanical properties of soil aggregates. SOM coverage resulted in an increased roughness and surface variability of soil, as well as in decreased stiffness and adhesive properties. The latter also correlates with nano- to macro-wettability features as determined by contact angle measurements and Water Drop Penetration Time (WDPT) testing. AFM thus represents an ideal quantitative tool to complement existing techniques within the emerging field of soil nanoscience.