Department of Information, Modeling, Electronics and System Engineering, (D.I.M.E.S.), University of Calabria, Via P. Bucci, Cubo 39C, Rende I-87036, CS, Italy.
Department of Physics, University of Calabria, Via P. Bucci, Cubo 31C, Rende I-87036, CS, Italy; CNR-NANOTEC c/o Department of Physics, University of Calabria, Via P. Bucci, Cubo 33B, Rende I-87036, CS, Italy.
Food Res Int. 2018 Sep;111:399-407. doi: 10.1016/j.foodres.2018.05.050. Epub 2018 May 23.
In this paper, the role of solvent characteristics on the rheological and physicochemical properties of organogels was investigated using different techniques. Vegetable oils, such as rice, sunflower and castor oil were used as solvents, for producing organogels with monoglycerides of fatty acids or a mixture of fatty alcohols (policosanol) as gelators. Moreover, two non-edible oils (silicon and paraffin oil) were also used for analysing the properties of solvents completely different in nature with respect to the edible ones, for a better interpretation of the given results. Organogels were investigated from a rheological point of view and through a microscopic analysis, given by polarised light (POM) and atomic force (AFM) microscopy, and X-rays to study the crystallinity of the system. The IR technique was used to analyse the intermolecular interactions, resulting in interesting information about the effect of oil polarity on the driving forces promoting structuration. This investigation showed that when solvents of a similar chemical nature are used, their physical properties, mainly oil polarity, are strictly related to the properties of the organogel, such as the onset of crystallisation temperature, the stiffness of the final material and its crystallinity. Anyway, these physical parameters seem insufficient to describe properly the role of solvents when oils of a different chemical nature are compared.
本文使用不同技术研究了溶剂特性对有机凝胶流变学和物理化学性质的影响。使用植物油，如米油、葵花籽油和蓖麻油作为溶剂，用脂肪酸的单甘油脂或混合脂肪酸醇（植物甾醇）作为凝胶剂来制备有机凝胶。此外，还使用了两种非食用油（硅油和石蜡油）来分析与食用油在性质上完全不同的溶剂的性质，以便更好地解释所给出的结果。从流变学角度和通过偏光显微镜（POM）和原子力显微镜（AFM）显微镜以及 X 射线研究了有机凝胶的结构，研究了系统的结晶度。红外技术用于分析分子间相互作用，从而提供了有关油极性对促进结构形成的驱动力的有趣信息。这项研究表明，当使用具有相似化学性质的溶剂时，它们的物理性质，主要是油的极性，与有机凝胶的性质密切相关，例如起始结晶温度、最终材料的硬度及其结晶度。然而，当比较具有不同化学性质的油时，这些物理参数似乎不足以正确描述溶剂的作用。
