Traditionally depicted as homogeneous materials, manmade and volcanic glasses are often subjected to nanostructuration during demixing and crystallization of their parental melt. While the controlled formation of nanocrystals has been exploited for decades in the industrial production of glass-ceramics to obtain materials with superior properties, nano-heterogeneities have been recently recognized in volcanic products erupted explosively. Here, a multi-pronged approach is adopted to highlight how the emergence of nano-heterogeneities exerts a previously unexplored influence on the viscosity of multicomponent silicate melts. Calorimetry and viscometry provide evidence of how the formation of TiO₂- and FeO-bearing nanocrystals increases the effective viscosity of suspensions. Raman spectroscopy and transmission electron microscopy allow the correlation between the increase in viscosity and the degree of sample modification. This study has implications for glass and glass-ceramics manufacturing and for the development of better numerical models of volcanic eruptions, which are key for the operational assessment of volcanic risk.

传统上被描述为均质材料，人造玻璃和火山玻璃通常在其母体熔体的混合和结晶过程中经历纳米结构化。尽管几十年来在玻璃陶瓷的工业生产中已经开发出了可控制的纳米晶体形成方法，以获得具有优异性能的材料，但是近来，在火山爆发的火山产物中已经认识到纳米异质性。在这里，采用多管齐下的方法来强调纳米异质性的出现如何对多组分硅酸盐熔体的粘度产生以前未曾探索的影​​响。量热法和粘度计提供了TiO ₂如何形成的证据-和含FeO的纳米晶体增加了悬浮液的有效粘度。拉曼光谱和透射电子显微镜允许粘度增加和样品改性程度之间的相关性。这项研究对玻璃和玻璃陶瓷制造以及火山喷发更好的数值模型的发展具有重要意义，而火山喷发的数值模型是火山风险评估的关键。