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Öğe Food-Grade Physically Unclonable Functions(Amer Chemical Soc, 2023) Esidir, Abidin; Kayaci, Nilgun; Kiremitler, N. Burak; Kalay, Mustafa; Sahin, Furkan; Sezer, Gulay; Kaya, MuratCounterfeit products in the pharmaceutical and food industries have posed an overwhelmingly increasing threat to the health of individuals and societies. An effective approach to prevent counterfeiting is the attachment of security labels directly on drugs and food products. This approach requires the development of security labels composed of safely digestible materials. In this study, we present the fabrication of security labels entirely based on the use of food-grade materials. The key idea proposed in this study is the exploitation of food-grade corn starch (CS) as an encoding material based on the microscopic dimensions, particulate structure, and adsorbent characteristics. The strong adsorption of a food colorant, erythrosine B (ErB), onto CS results in fluorescent CS@ErB microparticles. Randomly positioned CS@ErB particles can be obtained simply by spin-coating from aqueous solutions of tuned concentrations followed by transfer to an edible gelatin film. The optical and fluorescence microscopy images of randomly positioned particles are then used to construct keys for a physically unclonable function (PUF)-based security label. The performance of PUFs evaluated by uniformity, uniqueness, and randomness analysis demonstrates the strong promise of this platform. The biocompatibility of the fabricated PUFs is confirmed with assays using murine fibroblast cells. The extremely low-cost and sustainable security primitives fabricated from off-the-shelf food materials offer new routes in the fight against counterfeiting.Öğe Mechanochemical Activation of Silicone for Large-Scale Fabrication of Anti-Biofouling Liquid-like Surfaces(Amer Chemical Soc, 2023) Celik, Nusret; Sahin, Furkan; Ruzi, Mahmut; Ceylan, Ahmet; Butt, Hans-Jurgen; Onses, Mustafa SerdarLarge-scale preparation of liquid-like coatings with perfect transparency via solventless and room-temperature processes using low-cost and biocompatible materials is of tremendous interest for a broad range of applications. Here, we present a mechanochemical activation strategy for solventless grafting of poly-(dimethylsiloxane) (PDMS) onto glass, silicon wafers, and ceramics. Activation is achieved via ball milling PDMS without using any solvents or additives prior to application. Ball milling results in chain scission and generation of free radicals, allowing room-temperature grafting at durations <= 1 h. The deposition of ball-milled PDMS can be facilitated by brushing or drop-casting, enabling large-scale applications. The resulting surfaces facilitate the sliding of droplets at angles <20(degrees) for liquids with surface tension ranging from 22 to 73 mN/m. An important application for public health is generating anti-biofouling coatings on sanitary ware. For example, PDMS-grafted surfaces prepared on a regular-size toilet bowl exhibit a 105-fold decrease in the attachment of bacteria from urine. These findings highlight the significant potential of mechanochemical processes for the practical preparation of liquid-like surfaces.Öğe Mechanochemical Coupling of Alkylsilanes to Nanoparticles for Solvent-Free and Rapid Fabrication of Superhydrophobic Materials(Amer Chemical Soc, 2023) Celik, Nusret; Sezen, Berk; Sahin, Furkan; Ceylan, Ahmet; Ruzi, Mahmut; Onses, Mustafa SerdarExcellent repellencytoward water is one of the main characteristicsof superhydrophobic coatings that endow application potential in variousareas. However, the complex and time-consuming process involved inpreparing universally applicable superhydrophobic coatings, especiallythe step that involves modifying intrinsically hydrophilic inorganicoxide nanoparticles with hydrophobic alkylsilanes, limits their practicalapplications. This study demonstrates a rapid and eco-friendly approachto preparing superhydrophobic surfaces by chemically grafting alkylsilanemolecules onto silica nanoparticles using a mechanochemical process.The key advantages of this approach are (i) rapid process with preparationtimes that are orders of magnitude shorter than those of conventionalmethods, (ii) zero-solvent usage, and (iii) overcoming the need fortedious separation and drying steps. The resultant surface exhibitssuperhydrophobicity with a water contact angle of 172 & DEG; and asliding angle of 1 & DEG;. A monolith prepared by compressing the powderexhibits superhydrophobicity, durability, and antifouling abilityagainst urine. The superhydrophobic surface inhibits the growth oftwo of the most common pathogenic bacteria. The bacterial growth wasreduced by 10(7.07) for Escherichia coli and 10(5.78) for Staphylococcus aureus. The proposed approach is practical, swift, and cost-effective,making it a scalable and eco-friendly technique for the solvent-freepreparation of superhydrophobic surfaces.Öğe Tattoo-Like Multi-Color Physically Unclonable Functions(Wiley-V C H Verlag Gmbh, 2023) Kiremitler, N. Burak; Esidir, Abidin; Drake, Gryphon A.; Yazici, Ahmet Faruk; Sahin, Furkan; Torun, Ilker; Kalay, MustafaAdvanced anti-counterfeiting and authentication approaches are in urgent need of the rapidly digitizing society. Physically unclonable functions (PUFs) attract significant attention as a new-generation security primitive. The challenge is design and generation of multi-color PUFs that can be universally applicable to objects of varied composition, geometry, and rigidity. Herein, tattoo-like multi-color fluorescent PUFs are proposed and demonstrated. Multi-channel optical responses are created by electrospraying of polymers that contain semiconductor nanocrystals with precisely defined photoluminescence. The universality of this approach enables the use of dot and dot-in-rod geometries with unique optical characteristics. The fabricated multi-color PUFs are then transferred to a target object by using a temporary tattoo approach. Digitized keys generated from the red, green and blue fluorescence channels facilitate large encoding capacity and rapid authentication. Feature matching algorithms complement the authentication by direct image comparison, effectively alleviating constraints associated with imaging conditions. The strategy that paves the way for the development of practical, cost-effective, and secure anticounterfeiting systems is presented. Tattoo-like multi-color encoding layers based on random processing of semiconductor nanocrystals of varied composition and geometry are reported. Additive deposition via chaotic electrospraying enables randomness and multiplexing, whereas the tattoo approach provides substrate independence.image
