Physics

Nanomaterials

Meteorology

Nanotechnology

Polystyrene

Polyurethane

Porosity

Engineering

Composite material

Materials science

Thermal

Cellulose

Nanocellulose

Quantum mechanics

Anisotropy

Thermal conductivity

Chemical engineering

Polymer

Advanced Materials

Thermally insulating materials based on renewable nanomaterials such as nanocellulose could reduce the energy consumption and the environmental impact of the building sector. Recent reports of superinsulating cellulose nanomaterial (CNM)-based aerogels and foams with significantly better heat transport properties than the commercially dominating materials, such as expanded polystyrene, polyurethane foams, and glass wool, have resulted in a rapidly increasing research activity. Herein, the fundamental basis of thermal conductivity of porous materials is described, and the anisotropic heat transfer properties of CNMs and films with aligned CNMs and the processing and structure of novel CNM-based aerogels and foams with low thermal conductivities are presented and discussed. The extraordinarily low thermal conductivity of anisotropic porous architectures and multicomponent approaches are highlighted and related to the contributions of the Knudsen effect and phonon scattering.

Thermally Insulating Nanocellulose‐Based Materials