Table . Summary of the formation of core-shell structures using the hydro(solvo)thermal. Yolk shell structures have a movable core within a hollow cavity covered by a porous outer layer . It has characteristics such as low density, large surface area and excellent load capacity. These structures are applied in several areas, such as catalysis nanoreactors , energy storage and biomedicine . It is possible to obtain this structure through three methods. (i) Hard-templating that consists of coating the gem with a rigid material. (ii) Soft-templating, where the gem wall is formed by the self-assembly of the amphiphilic molecules. (iii) Self-modeling that does not use additional models. This method besides creating the empty cavity also involves the composition of the nanoparticle . Notable examples of yolk shell structures prepared by hydo(solvo)thermal are presented in the Table . Janus-like structures are particles that have different functionalities on their opposite sides. It can be composed of three distinct groups, (i) hard (inorganic), (ii) soft (organic or polymeric) and (iii) hybrids (organic/inorganic) . These Janus-like nanoparticles have several shapes, from traditional conventional spheres to more elaborate structures, such as dumbbells , snowman , nameplate , rod or tadpole shapes . Due to its peculiarity, the control and manipulation of these particles is achieved by manipulating various external factors (temperature, light, pH or ionic strength). The mass transport at the interface between the two phases of the particle controls the particle size, edge geometry and material porosity . Some examples are shown in Table . [544]