Recent advances in shape–memory polymers: Structure, mechanism, functionality, modeling and applications

A review of stimuli-responsive shape memory polymer composites

Stimulus-responsive shape memory materials: A review

Shape memory polymers: Past, present and future developments

The English-language dictionary defines wrinkles as "small furrows, ridges, or creases on a normally smooth surface, caused by crumpling, folding, or shrinking". In this paper we review the scientific aspects of wrinkling and the related phenomenon of buckling. Specifically, we discuss how and why wrinkles/buckles form in various materials. We also describe several examples from everyday life, which demonstrate that wrinkling or buckling is indeed a commonplace phenomenon that spans a multitude of length scales. We will emphasize that wrinkling is not always a frustrating feature (e.g., wrinkles in human skin), as it can help to assemble new structures, understand important physical phenomena, and even assist in characterizing chief material properties.

Soft matter with hard skin : From skin wrinkles to templating and material characterization

(Figure Presented) Controllable biaxial and uniaxial nanowrinkles (see figure) are fabricated by a simple two-step approach - metal deposition and subsequent heating - based on shape memory polymer (prestressed polystyrene) sheets. The wavelengths of the wrinkles can be tuned by controlling the thickness of deposited metal. The ready integration of the nanowrinkles into microchannels and their effectiveness in surface enhanced sensing is demonstrated. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA.

https://escholarship.org/content/qt00k0v52n/qt00k0v52n.pdf

Tunable Nanowrinkles on Shape Memory Polymer Sheets

We present a simple, ultra-rapid and robust method to create sharp nanostructures—nanopetals—in a shape memory polymer substrate demonstrating unprecedented enhancements for surface enhanced sensing over large surface areas. These bimetallic nanostructures demonstrate extremely strong surface plasmon resonance effects due to the high density multifaceted petal structures that increase the probability of forming nanogaps. We demonstrate that our nanopetals exhibit extremely strong surface plasmons, confining the emission and enhancing the fluorescence intensity of the nearby high-quantum yield fluorescein by >4000×. The enhancements are confined to the extremely small volumes at the nanopetal borders. This enables us to achieve single molecule detection at relatively high and physiological concentrations.

/pdf/bimetallic-nanopetals-for-thousand-fold-fluorescence-4cbt17yk7g.pdf

Bimetallic nanopetals for thousand-fold fluorescence enhancements

Methods of using a device is provided that contains a heat-shrunk thermoplastic base having a high-surface area textured metal surface, wherein the textured metal surface has an average height from about 100 nanometers to about 5 micrometers.

Chi-Cheng Fu

Papers

Tunable Nanowrinkles on Shape Memory Polymer Sheets

Bimetallic nanopetals for thousand-fold fluorescence enhancements

Metal-coated shrinkable polystyrene and methods for using same

Shrink-Induced Nanowrinkles: Tunable Nanowrinkles on Shape Memory Polymer Sheets (Adv. Mater. 44/2009)