Cellulose nanocrystal chiral photonic micro-flakes for multilevel anti-counterfeiting and identification

Self-Healable, Solvent Response Cellulose Nanocrystal/Waterborne Polyurethane Nanocomposites with Encryption Capability

“…When the pitch length of FPFS is a few hundred nanometers, it is similar to the wavelength of visible light, and different colors can be obtained by controlling the pitch and at different viewing angles. The wavelength of reflection obeys the Bragg formula: λ max = n a v g P nobreak0em0.25em⁢ sin ( θ ) where λ max is the peak of the reflected wavelength, n avg is the average refractive index of the film, P is the pitch, and θ is the viewing angle. The n avg of CNC is 1.54, and that of WPU is 1.50, which are similar, so the reflection wavelength mainly depends on the pitch.…”

Lignocellulose Nanoparticles Extracted from Cattle Dung as Pickering Emulsifiers for Microencapsulating Phase Change Materials

“…Moreover, many functional nanocomposites have been fabricated via employing Pickering emulsions as templates, and nanoparticles as Pickering emulsifiers provide enormous potential to tune the properties of nanocomposites. ,− Therefore, Pickering emulsions have received increasing attention in both academics and industries in recent years. Nanocelluloses possess outstanding Pickering emulsifying ability, and nanocellulose stabilized Pickering emulsions have been widely employed as templates to fabricate nanocellulose reinforced polymer composites, colloidosomes, aerogels, and microcapsules. ,,,,, …”

“…Nanocelluloses possess outstanding Pickering emulsifying ability, and nanocellulose stabilized Pickering emulsions have been widely employed as templates to fabricate nanocellulose reinforced polymer composites, colloidosomes, aerogels, and microcapsules. 8,12,25,39,42,43 Microcapsules with nanocellulose stabilized Pickering emulsions as templates are promising to encapsulate chemicals such as drugs for control release and phase change materials (PCMs) for thermal regulation. 25,44−49 PCMs can absorb or release abundant latent heat during phase change at an almost constant temperature.…”

“…However, most of the nanoparticles are prepared via “bottom-up” assembling or “top-down” extracting strategies by tedious and high energy-consuming mechanical and violent chemical processes at high temperature. , Therefore, nanoparticles are generally high-cost and environmental unfriendly. It is highly demanded to develop sustainable and functional nanoparticles via facile methods from green raw materials. − Nanocelluloses are promising nanoparticles due to their renewability, biodegradability, biocompatibility, high aspect surface area and aspect ratio, excellent mechanical properties, water-dispersibility, and Pickering emulsifying ability. − Nanocelluloses with high crystallinity occur in natural cellulose materials such as wood, cotton, and straw. − Nanocelluloses, including cellulose nanocrystals (CNCs) and cellulose nanofibers (CNFs), are generally fabricated by “top-down” strategy. CNCs and CNFs are extracted from plants by removing lignin and hemicellulose via severe mechanical and chemical treatments such as acid hydrolysis, oxidation, high pressure homogenization, ultrasonication, and temperature control. ,− These processes are time-consuming, energy-intensive, and environmentally unfriendly, leading to a high cost and limited commercial applications of nanocelluloses.…”

Adaptive host–guest chiral recognition in nanoarchitectonics with biomimetic MOF mimicking DNA

“…1,2 The two enantiomers of chiral molecules tend to have different contents in nature, and some even exist only as a single enantiomer, which is a phenomenon known as chiral preference. [3][4][5][6][7] Chiral preference endows biological macromolecules, which are important substances in life activities, with chirality. [8][9][10][11] When these biological macromolecules interact with two enantiomers of other chiral guest molecules, 12 they will produce different effects, that is, they have the chiral recognition effect, such as in DNA, the "code book" of Earth's biodiversity.…”