Zbik Marek S, Frost Ray L, Song Yen-Fang
Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, 2 George Street, GPO Box 2434, Brisbane Qld 4001, Australia.
J Colloid Interface Sci. 2008 Mar 1;319(1):169-74. doi: 10.1016/j.jcis.2007.10.062. Epub 2007 Nov 17.
This paper reports new application of new transmission X-ray microscopy powered by a synchrotron source for the study of aqueous based clay suspensions. This paper delineates the advantages and limitations of this method. The tested transmission X-ray microscopy (TXM) technique has shown good agreement with the cryo-stage SEM technique. The spacial resolution of this TXM technique is 60 nm and clay particles with diameter below 500 nm are clearly visible and their pseudohexagonal symmetry is recognizable in detail. It is clearly demonstrated the methodology of implementing TXM to study aqueous based clay suspensions that are close to approximately 60 nm tomographic resolution. The technique enables us to study discrete structure of clay suspensions in water and within aggregates. This has never been previously possible. Larger crystals, more compact aggregates and less colloidal fraction present in kaolinite from Georgia has impact on faster settling and gelling in denser suspension than for Birdwood kaolinite in which colloidal particles create gel-like networking in less dense aqueous suspension.
本文报道了由同步辐射源驱动的新型透射X射线显微镜在水基粘土悬浮液研究中的新应用。本文阐述了该方法的优点和局限性。所测试的透射X射线显微镜（TXM）技术与低温台扫描电子显微镜技术显示出良好的一致性。该TXM技术的空间分辨率为60纳米，直径小于500纳米的粘土颗粒清晰可见，其准六边形对称性可详细识别。清楚地展示了实施TXM以研究接近约60纳米断层分辨率的水基粘土悬浮液的方法。该技术使我们能够研究水中和聚集体内粘土悬浮液的离散结构。这在以前是不可能的。与伯德伍德高岭土相比，佐治亚州高岭土中存在的更大晶体、更紧密的聚集体和更少的胶体部分，对密度更大的悬浮液中更快的沉降和胶凝有影响，在伯德伍德高岭土中，胶体颗粒在密度较小的水悬浮液中形成凝胶状网络。
