Liquids can turn into solids without freezing through a process called evaporation-induced self-assembly. This process involves the rapid evaporation of a liquid, causing the molecules to come closer together and form a solid structure.

Here's a step-by-step explanation of how evaporation-induced self-assembly works:

1. Liquid film formation: A thin liquid film is created by spreading the liquid onto a substrate or confining it between two surfaces.

2. Evaporation: The liquid film is exposed to a low-pressure environment, causing the solvent to evaporate rapidly. This rapid evaporation creates a high concentration of solute molecules within the liquid film.

3. Self-assembly: As the solvent evaporates, the solute molecules become increasingly concentrated and start to interact with each other. These interactions can lead to the formation of ordered structures, such as crystals or nanostructures.

4. Solid formation: The interactions between the solute molecules become strong enough to hold the molecules in place, resulting in the formation of a solid structure. This solid structure can have different properties and characteristics depending on the nature of the solute molecules and the evaporation conditions.

Evaporation-induced self-assembly is a widely used technique for fabricating various functional materials, including thin films, nanowires, and crystals. It offers precise control over the morphology, composition, and properties of the resulting solid structures.