US 12,286,522 B2
Highly scattering porous material based on fibrillar, elongated, or disk-like particles
Matti Toivonen, Aalto (FI); Olli Ikkala, Aalto (FI); Silvia Vignolini, Cambridge (GB); and Olimpia Domitilla Onelli, Cambridge (GB)
Assigned to Aalto University Foundation SR, Aalto (FI); and Cambridge Enterprise Limited, Cambridge (GB)
Appl. No. 16/647,744
Filed by Aalto University Foundation SR, Aalto (FI); and Cambridge Enterprise Limited, Cambridge (GB)
PCT Filed Sep. 26, 2018, PCT No. PCT/EP2018/076186
§ 371(c)(1), (2) Date Mar. 16, 2020,
PCT Pub. No. WO2019/063647, PCT Pub. Date Apr. 4, 2019.
Claims priority of application No. 20175855 (FI), filed on Sep. 26, 2017.
Prior Publication US 2020/0224001 A1, Jul. 16, 2020
Int. Cl. C08J 9/28 (2006.01); C08J 9/00 (2006.01)
CPC C08J 9/286 (2013.01) [C08J 9/0085 (2013.01); C08J 2201/04 (2013.01); C08J 2301/02 (2013.01)] 17 Claims
OG exemplary drawing
 
8. A porous fibril-based material comprising:
fibrillar or elongated colloidal cellulose particles,
wherein the fibrillar or elongated colloidal cellulose particles consist of fibrillar or elongated colloidal cellulose particles having diameters from 150 nm to 500 nm, wherein the fibrillar or elongated colloidal cellulose particles form a distribution of particles having diameters from 150 nm to 500 nm with an average diameter of about 250 nm, according to the lognormal distribution;
and
air or another ambient gas in the pores of the material between the particles, the material having a porosity of 20% or more, a density of between 400 and 950 kg/m3 and 20% to 80% by volume of solids,
the material having a total reflectance of more than 70% for a material thickness of 10 μm, and
the material having a total transmittance of less than 50% for a material of 10 μm, as measured using a wavelength of 500 nm,
wherein the material is in the form of a membrane having a thickness of 0.1 to 100 μm.