Deep eutectic solvents (DESs) are a recently introduced class of sustainable solvents, being studied by many researchers in various fields. Because of the vast potential applications of DESs, it is necessary to have their physical properties available. Surface tension is an important physical property which has significant effects on permeability and bubbling, and hence in the design of processes. Up to date, there is no general model available in open literature for estimating the surface tension of DESs. In this study, for the first time, a general, simple, easy-to-use, and accurate correlation is proposed for the estimation of the surface tension of DESs at different temperatures. The correlation was developed based on a large data bank, including 553 data points, from 112 DESs having different natures. The model results were investigated by different statistical analyses and it was found that the correlation is not biased and shows normal behavior. The value of calculated overall AARD% of the model is 8.8%. The proposed model was compared to three general surface tension models in the literature and the comparison showed greater reliability and better agreement of the proposed model with respect to other literature models.

深共熔溶剂（DES）是最近引入的一类可持续溶剂，许多领域的许多研究人员正在对其进行研究。由于DES潜在的广泛应用，因此有必要提供其物理性质。表面张力是重要的物理性质，其对渗透性和起泡以及因此在工艺设计中具有显着影响。迄今为止，公开文献中没有可用的通用模型来估计DES的表面张力。在这项研究中，首次提出了一种通用，简单，易于使用且准确的相关性，以估算不同温度下DES的表面张力。相关性是根据来自112个具有不同性质的DES的大型数据库（包括553个数据点）开发的。通过不同的统计分析对模型结果进行了调查，结果发现相关性没有偏差，并显示出正常的行为。计算得出的总价值该模型的AARD％为8.8％。将所提出的模型与文献中的三个一般表面张力模型进行了比较，比较结果表明所提出的模型相对于其他文献模型具有更高的可靠性和更好的一致性。