School of Physical and Chemical Sciences, Queensland University of Technology, Brisbane, Queensland, Australia.
Spectrochim Acta A Mol Biomol Spectrosc. 2010 Mar;75(3):960-3. doi: 10.1016/j.saa.2009.12.001. Epub 2009 Dec 5.
The adsorption of stearic acid on both sodium montmorillonites and calcium montmorillonites has been studied by near infrared spectroscopy complimented with infrared spectroscopy. Upon adsorption of stearic acid on Ca-Mt additional near infrared bands are observed at 8236 cm(-1) and is assigned to an interaction of stearic acid with the water of hydration. Upon adsorption of the stearic acid on Na-Mt, the NIR bands are now observed at 5671, 5778, 5848 and 5912 cm(-1) and are assigned to the overtone and combination bands of the CH fundamentals. Additional bands at 4177, 4250, 4324, 4337, 4689 and 4809 cm(-1) are attributed to CH combination bands resulting from the adsorption of the stearic acid. Stearic acid is used as a model molecule for adsorption studies. The application of near infrared spectroscopy to the study of this adsorption proved most useful.
通过近红外光谱学与红外光谱学的联用，研究了硬脂酸在钠蒙脱石和钙蒙脱石上的吸附。硬脂酸吸附在 Ca-Mt 上后，在 8236cm(-1)处观察到额外的近红外带，这归因于硬脂酸与水合层之间的相互作用。硬脂酸吸附在 Na-Mt 上后，NIR 带现在出现在 5671、5778、5848 和 5912cm(-1)处，被分配为 CH 基元的倍频和组合带。4177、4250、4324、4337、4689 和 4809cm(-1)处的附加带归因于硬脂酸吸附导致的 CH 组合带。硬脂酸被用作吸附研究的模型分子。近红外光谱学在这项吸附研究中的应用非常有用。
