CONTROLLED POROSITY STRUCTURAL MATERIAL WITH NANOCELLULOSE FIBERS

The present invention provides， inter alia， biocompatible porous structural materials made exclusively or almost exclusively from nanocellulose fibers (CNF)， CNC， or bacterial cellulose， as well as processes for making and using provided compositions. Provided compositions may possess specifically tailored mechanical strength properties and have a design-controlled porosity that is homogeneous or graded， depending on the application. Provided compositions may be manufactured by the controlled dewatering of suspensions of CNF. In some embodiments， provided compositions may include a solids concentration of about 10% to about 95% by weight. Controlled water removal and pore homo- or heterogeneity may be accomplished by controlling capillary， hydrostatic and evaporative processes in the environment of a porous mold around the CNF slurry. A freeze drying or vacuum drying step may be used to complete the drying process， locking in the porous network structure resulting in a predetermined porosity (pore volume/total volume)， and pore size distribution. The present invention provides， inter alia， biocompatible porous structural materials made exclusively or almost exclusively from nanocellulose fibers (CNF)， CNC， or bacterial cellulose， as well as processes for making and using provided compositions. Provided compositions may possess specifically tailored mechanical strength properties and have a design-controlled porosity that is homogeneous or graded， depending on the application. Provided compositions may be manufactured by the controlled dewatering of suspensions of CNF. In some embodiments， provided compositions may include a solids concentration of about 10% to about 95% by weight. Controlled water removal and pore homo- or heterogeneity may be accomplished by controlling capillary， hydrostatic and evaporative processes in the environment of a porous mold around the CNF slurry. A freeze drying or vacuum drying step may be used to complete the drying process， locking in the porous network structure resulting in a predetermined porosity (pore volume/total volume)， and pore size distribution.