Switchable surfaces play an important role in the development of functional materials. However, the construction of dynamic surface textures remains challenging due to the complicated structural design and surface patterning. Herein, a pruney finger-inspired switchable surface (PFISS) is developed by constructing water-sensitive surface textures on a polydimethylsiloxane substrate by taking advantage of the hygroscopicity of the inorganic salt filler and the 3D printing technology. Like human fingertips, the PFISS shows high water sensitivity with obvious surface variation in wet and dry states, which is actuated by water absorption−desorption of the hydrotropic inorganic salt filler. Besides, when the fluorescent dye is optionally added into the matrix of the surface texture, water-responsive fluorescent emitting is observed, providing a feasible surface-tracing strategy. The PFISS shows effective regulation of the surface friction and performs a good antislip effect. The reported synthetic strategy for the PFISS offers a facile way for building a wide range of switchable surfaces.
displaying is: no optical contrast in the dry state but significant optical contrasts by wetting to show invisible cryptographic patterns, which are composed of switchable microstructures. For information encoding, the patterning of microstructure arrays according to the design in a reliable and reproducible manner is the essential procedure. Various strategies for microstructures patterning have been reported, from evaporation-induced colloidal self-assembly, [23][24][25] top-down lithographic techniques [26,27] to model-assisted casting [28] and inkjet printing. [29,30] However, most of these current technologies suffer from some issues, such as limited pattern variants, low throughput, expensive fabrication, and time-consuming and complicated steps, etc. Few of them simultaneously satisfy the requirements for varied commercial applications. As one of the most promising methods for customizable patterning, 3D printing is a manufacturing process in which material is laid down, layer by layer, to form a three-dimensional object. [9,31,32] The critical advantage of 3D printing is the ability to turn arbitrary digital files data into physical objects, which largely extend the scope of the patterning of the microstructures and have higher throughput and printing resolution through more facile processes. However, currently reported 3D printing of optical material mainly focuses on the static system, especially in the printing of the periodic-ordered photonic crystal. [32][33][34][35][36] For dynamic optical materials based on amorphous microstructures, the 3D printing technology is less involved. As known, periodic-ordered structures are highly angle-dependent, which is a major challenge in wide-viewing angles. Instead, with less angle dependency, adaptive amorphous photonic structures show larger potential in covert-overt displaying. [26] Besides, the random morphological feature makes it possible to nondeterministically encode the information. [37] Herein, we report the direct 3D printing of mixture ink of water droplets and polydimethylsiloxane (PDMS) precursor as the customizable encrypted graphics. Lines and faces are directly written by a 3D dispenser, where the water droplets arrangement is set to be an amorphous array. During the curing of the printed graphics, water vapor evaporates from the microdroplets, accompanied by the in-situ formation of dynamic microcreases in the elastomer matrix of the covert graphics (Figure 1). When exposed to varied liquids, the dynamic Adaptive optical performance based on convertible microstructures is very useful for information encryption. However, the facile patterning of microstructures in reliable manner and the unclonable coding are still major challenges. The direct 3D printing of water droplets is reported as templates to polydimethylsiloxane (PDMS) precursor, followed by water evaporation in curing, which introduces convertible microcrease in the elastomeric matrix. The samples show optical response to liquids with the conversion of inner creases to ponds or cavities...
Shape memory polymers (SMPs) show great potential in biomedical fields. However, most of the SMPs are not suitable for use in human body due to their deleteriousness and harsh actuation...
C11H12N4O2, monoclinic, Cc (no. 9), a = 16.146(5) Å, b = 14.653(4) Å, c = 14.621(4) Å, β = 106.052(8)°, V = 3324.3(16) Å3, Z = 12, Rgt(F) = 0.0415, wRref(F2) = 0.0965, T = 173(2) K.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.