Abellán-Martín Sergio J, Zapater Cristina, González-Gallardo Nerea, Aguirre Miguel Ángel, Vidal Lorena, Ramón Diego J, Canals Antonio
Department of Analytical Chemistry, Nutrition and Food Science and University Institute of Materials, Faculty of Science, University of Alicante, P.O. Box 99, 03080, Alicante, Spain.
Department of Organic Chemistry and University Institute of Organic Synthesis (ISO), Faculty of Science, University of Alicante, P.O. Box 99, 03080, Alicante, Spain.
Chemphyschem. 2024 Dec 16;25(24):e202400458. doi: 10.1002/cphc.202400458. Epub 2024 Nov 3.
In this work, the surface nature-dependent behaviors of magnetic deep eutectic solvents (MDESs) and magnetic low-transition-temperature non-volatile mixtures (MLTTMs) are reported for the first time. It has been observed that the surface of the material where the MDES or the MLTTM is placed could considerably affect the dispersion and the magnetic and structural properties of these magnetic mixtures. Different techniques and analyses have been carried out to highlight the differences observed in the properties depending on the material on which these magnetic mixtures are placed. To that end, differential scanning calorimetry (DSC), surface tension, contact angle and scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX) measurements have been performed. As a result, it has been shown that the MDESs or MLTTMs are retained and adhered to glass surfaces, resulting in a loss of magnetism of the mixture in addition to a loss in the performance of synthesis carried out on the closeness of glass materials as the interaction between the glass and the mixture modify the composition and therefore the properties. As a preliminary result, when using these magnetic mixtures as extractant solvents in dispersive liquid-liquid microextraction, the MDES or MLTTM is retained on the walls of the glass tubes reducing the extraction efficiency, repeatability and the extraction recovery using an external magnetic field. For all these reasons, polypropylene materials should be recommended when handling magnetic deep eutectic solvents and non-volatile MLTTMs.
在这项工作中，首次报道了磁性深共熔溶剂（MDESs）和磁性低转变温度非挥发性混合物（MLTTMs）的表面性质依赖性行为。据观察，放置MDES或MLTTM的材料表面会显著影响这些磁性混合物的分散性、磁性和结构性质。已开展了不同的技术和分析，以突出根据放置这些磁性混合物的材料不同而观察到的性质差异。为此，进行了差示扫描量热法（DSC）、表面张力、接触角以及带有能量色散X射线光谱的扫描电子显微镜（SEM-EDX）测量。结果表明，MDESs或MLTTMs会保留并附着在玻璃表面，除了由于玻璃与混合物之间的相互作用改变了组成从而影响性质，导致在玻璃材料附近进行的合成性能下降外，还会使混合物失去磁性。作为初步结果，当在分散液液微萃取中使用这些磁性混合物作为萃取溶剂时，MDES或MLTTM会保留在玻璃管壁上，从而降低使用外部磁场时的萃取效率、重复性和萃取回收率。基于所有这些原因，在处理磁性深共熔溶剂和非挥发性MLTTMs时，建议使用聚丙烯材料。
