Yilmazer Senem, Schwaller Duncan, Mésini Philippe J
Institute Charles Sadron, University of Strasbourg, CNRS, 23 Rue du Loess, 67000 Strasbourg, France.
Gels. 2023 Mar 25;9(4):273. doi: 10.3390/gels9040273.
The existence of sol-gel transitions is one of the most manifest properties of molecular gels. These transitions reflect their nature since they correspond to the association or dissociation of low weight molecules through non-covalent interactions to form the network constitutive of the gel. Most described molecular gels undergo only one gel-to-sol transition upon heating, and the reverse sol-to-gel transition upon cooling. It has been long observed that different conditions of formation could lead to gels with different morphologies, and that gels can undergo a transition from gel to crystals. However, more recent publications report molecular gels which exhibit additional transitions, for instance gel-to-gel transitions. This review surveys the molecular gels for which, in addition to sol-gel transitions, transitions of different nature have been reported: gel-to-gel transitions, gel-to-crystal transition, liquid-liquid phase separations, eutectic transformations, and synereses.
溶胶-凝胶转变的存在是分子凝胶最显著的特性之一。这些转变反映了它们的本质，因为它们对应于低分子量分子通过非共价相互作用缔合或解离以形成凝胶的网络结构。大多数已描述的分子凝胶在加热时仅经历一次凝胶到溶胶的转变，而在冷却时经历相反的溶胶到凝胶的转变。长期以来人们观察到，不同的形成条件可能导致具有不同形态的凝胶，并且凝胶可以经历从凝胶到晶体的转变。然而，最近的出版物报道了表现出额外转变的分子凝胶，例如凝胶到凝胶的转变。本综述调查了除溶胶-凝胶转变外还报道了不同性质转变的分子凝胶：凝胶到凝胶的转变、凝胶到晶体的转变、液-液相分离、共晶转变和脱水收缩。
