Martín-Alfonso M A, Rubio-Valle José F, Hinestroza Juan P, Martín-Alfonso José E
Department of Chemical Engineering and Materials Science, University of Huelva, Chemical Product and Process Technology Research Center (Pro2TecS), 21071 Huelva, Spain.
Department of Fiber Science and Apparel Design, Cornell University, Ithaca, NY 14853, USA.
Gels. 2022 Aug 13;8(8):504. doi: 10.3390/gels8080504.
We formulated and characterized oleogels based on montmorillonite clay and vegetable oils that could serve as eco-friendly semi-solid lubricants. In particular, we studied the influence of the physical-chemical properties of olive, castor, soybean, linseed, and sunflower oils on the rheological, chemical, thermal, and tribological properties of the semi-solid lubricants. We prepared the oleogels via the highly intensive mixing of vegetable oils with clay at a concentration of 30 wt.%. The oleogels exhibited shear-thinning, thixotropy, structural recovery, and gel-like behavior commonly related to that of a three-dimensional network. The results were corroborated via XRD measurements showing the presence of intercalated nanoclay structures well-dispersed in the vegetable oil. Empirical correlations between the content of saturated (SFAs), unsaturated (UFAs), mono-unsaturated (MUFAs) and poly-unsaturated (PUFAs) fatty acids and the plateau modulus of the aerogels were found. From these experimental results, we can conclude that the fatty acid profile of the vegetable oils exerts an important influence on the rheological and tribological properties of resulting clay and vegetable oil oleogels.
我们制备并表征了基于蒙脱石粘土和植物油的油凝胶，其可作为环保型半固体润滑剂。具体而言，我们研究了橄榄油、蓖麻油、大豆油、亚麻籽油和葵花籽油的物理化学性质对这些半固体润滑剂的流变学、化学、热学和摩擦学性质的影响。我们通过将植物油与浓度为30 wt.%的粘土进行高强度混合来制备油凝胶。这些油凝胶表现出剪切变稀、触变性、结构恢复以及通常与三维网络相关的凝胶状行为。通过XRD测量证实了结果，显示出插层纳米粘土结构存在且在植物油中分散良好。发现了饱和脂肪酸（SFAs）、不饱和脂肪酸（UFAs）、单不饱和脂肪酸（MUFAs）和多不饱和脂肪酸（PUFAs）的含量与气凝胶的平台模量之间的经验相关性。从这些实验结果可以得出结论，植物油的脂肪酸组成对所得粘土和植物油油凝胶的流变学和摩擦学性质有重要影响。
