Trindade, Ana C.Carreto, MiguelHelgesen, GeirKnudsen, Kenneth D.Puchtler, FlorianBreu, JosefFernandes, SuseteGodinho, Maria HelenaFossum, Jon Otto2021-01-082021-01-082020-111951-6355PURE: 26616404PURE UUID: 9b2b214a-6913-4e25-811d-62988a6bf8e1Scopus: 85096011063WOS: 000590141900002ORCID: /0000-0002-7871-6717/work/86471777http://hdl.handle.net/10362/109954POCI-01-0145-FEDER007688 (Reference UID/CTM/50025) PTDC/FIS-NAN/0117/2014 PTDC/CTM-BIO/6178/2014 M-ERA-NET2/0007/2016 (CellColor) PTDC/CTM-REF/30529/2017 (NanoCell2SEC). {Nano2021 Program (250619 Graphene-NanoClay Systems).Cellulose nano crystals (CNCs) are promising materials for energy efficient buildings related to the control of reflectivity and heat absorption/reflection of light. In this sense it is important to improve CNCs films fire retardant properties, which can be achieved by adding clays. Cellulose nanocrystals (CNCs) and nanolayers obtained from Sodium Fluorohectorite (NaFh) synthetic clay are both known to form liquid crystalline phases in aqueous suspensions. CNCs form cholesteric phases, which structure is preserved after water evaporation, while dry NaFh nanolayers aligned films collapse. In this initial work, it is shown that CNCs are compatible with NaFh clay. We demonstrate that the liquid crystalline phase of CNCs in water is not destroyed by the presence of NaFh nanolayers. The NaFh nanolayers act as planar anchoring surfaces to the cellulose nanorods and, after evaporation of the water coloured films are obtained. The precursor solutions and the photonic films were investigated by Describe several techniques.152114388engGeneral Materials ScienceGeneral Physics and AstronomyPhysical and Theoretical Chemistryjournal article10.1140/epjst/e2020-000015-yhttps://www.scopus.com/pages/publications/85096011063