Hydrocipher: Bioinspired Dynamic Structural Color‐Based Cryptographic Surface

Bioinspired structural materials.

Natural structural materials are built at ambient temperature from a fairly limited selection of components. They usually comprise hard and soft phases arranged in complex hierarchical architectures, with characteristic dimensions spanning from the nanoscale to the macroscale. The resulting materials are lightweight and often display unique combinations of strength and toughness, but have prove...

Dynamic Cryptographic Hash Functions

Speirs II, William Robert Ph.D., Purdue University, May, 2007. Dynamic Cryptographic Hash Functions. Major Professor: Samuel S. Wagstaff, Jr. This dissertation introduces a new type of cryptographic hash function, the dynamic cryptographic hash function. Dynamic cryptographic hash functions differ from traditional hash functions because they require a second parameter, the security parameter. T...

A Bioinspired 128x128 Pixel Dynamic-Vision- Sensor

−This paper presents a 128x128 dynamic vision sensor. Each pixel detects temporal changes in the local illumination. A minimum illumination temporal contrast of 10% can be detected. A compact preamplification stage has been introduced that allows to improve the minimum detectable contrast over previous designs, while at the same time reducing the pixel area by 1/3. The pixel responds to illumin...

Enhanced adhesion of bioinspired nanopatterned elastomers via colloidal surface assembly.

We describe a scalable method to fabricate nanopatterned bioinspired dry adhesives using colloidal lithography. Close-packed monolayers of polystyrene particles were formed at the air/water interface, on which polydimethylsiloxane (PDMS) was applied. The order of the colloidal monolayer and the immersion depth of the particles were tuned by altering the pH and ionic strength of the water. Initi...

Bioinspired Selective Surface Deposition of Fragrance Delivery Systems