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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"Mechanochromic"”.
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Towards Mechanochromic Devices using Biocompatible Hydroxypropyl Cellulose
… HPC. Intrinsically biodegradable, edible and mechanochromic, photonic HPC can be manufactured at scale and low-cost in a simple formulation. A high reflectivity also allows for easy integration with common camera technologies. A rich seam of exploration therefore exists for the photonic …
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Control of mechanochromic reactions in a polymer matrix
… on two different color-changing mechanophores, mechanochromic spiropyran (SP) and recently developed naphthopyran (NP), in polymeric matrices. First, the effect of force on the rate constants and activation energies for SP–merocyanine (MC) transition is characterized in bulk polymers. Under …
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Local Shape Estimation Using Mechanochromic Structurally-Colored Tactile Sensors
… in this work involves the use of a custom tiled mechanochromic structurally-colored film in conjunction with a digital camera, and calculates shape and strain information of the film based on how the observed colors shift when undergoing deformation. When combined with a transparent elastomeric …
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Insights for designing mechanochromic spiropyrans from first principles dynamics and minimum energy pathways
The energy needed for a chemical reaction usually comes in the form of heat or light, which may alter the arrangement of reactant molecules on the ground state or place them on an excited state to surmount an energy barrier. An alternative and less well-explored way of initiating a chemical …
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Multifunctional systems with polymer actuators : mechanochromism and peristalic pumping
… survivability systems, pumping microfibers and mechanochromic pixels. Progress was made along the two major paths of investigation towards the realization of a pumping microfiber. Polypyrrole was chemically deposited onto copolyetherester. Tubular polypyrrole actuators at the millimeter scale …
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Mechanophore-Linked Polymers for Studying Mechanochemical Response
… we were able to realize a self-assessing mechanochromic material that directly couples mechanical energy to structural response, by incorporating a SP mechanophore into elastomeric and glassy materials.
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Light manipulation with photonic fibers and optical light guides : dynamic structural color and light distribution in microalgae cultures
… their length when illuminated from one end. Mechanochromic fibers that convert a mechanical perturbation into an optical response can be used, standalone or integrated into textiles, as easy-to-read strain sensors. Such fibers respond to elongation with a gradual shift in their reflected …
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Mechanochromism and Strain-Induced Crystallization in Thiol-yne-derived Stereoelastomers
… SIC, which are each strain rate-dependent. When mechanochromic films are stretched slowly to the point of mechanophore activation, the covalently-tethered mechanophore remains trapped in a force-activated state, even after the applied stress is removed; additionally, the kinetics of mechanophore …
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Elastic and Thermoelastic Stresses in Biomedical Sensors and Bicomponent Fibers
… device-related pressure injuries (MDRPIs), a mechanochromic sensor was designed and fabricated from elastomeric films embedded with silica nanoparticles. The sensor exhibits a distinct, reversible transition from transparent to opaque white within pressure levels clinically associated with the …
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Design and synthesis of cyclometalated transition metal complexes as functional phosphorescent materials
… Furthermore, the combined liquid crystalline and mechanochromic properties make them attractive functional materials.
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The interplay between order and disorder in cholesteric hydroxypropyl cellulose films
… HPC films, validating this approach. Lastly, the mechanochromic behaviour of large-scale HPC films is investigated as a practical example of the importance of nanoscale structure to the macroscopic optical response, with a potential application as a pressure sensor.
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Sistemas Luminiscentes Ciclometalados de Pt e Ir con Cromóforos 2-Arilbenzotiazol: Aplicaciones Biológicas y Fotocatalíticas
… with distinct optical properties, including mechanochromic behavior. Furthermore, the Me2N-pbt complexes show dual emissions, singlet oxygen generation and antiproliferative ability. This latter has been studied against breast and lung cancer tumour cell lines (MDA-MB-231 and A549) and …
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Investigating Shear-induced Damage during Hydrogel Extrusion-based Manufacturing: Rheological Insights and Mechanophore Incorporation
… different flow conditions. Hydrogels showed mechanochromic behaviour during extrusion due to the activation of spiropyran moieties, where gels with lower water content and a higher concentration of mechanophores showed a more intense colour change. This research provides a rigorous and …
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Force-induced mechanochemical reactions in polymeric systems
… into polyurethane (PU) was demonstrated to be mechanochromic, and the conversion to the colored MC form was characterized by changes in absorption and fluorescence. PU’s optimized balance of mechanical toughness and elasticity also allowed for the change in SP-MC equilibrium to be studied. …
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Design and synthesis of mechanoresponsive materials and multivalent polymer-peptide conjugates
Functional polymers have been studied extensively due to their versatility and ability to yield diverse materials with desirable properties. Polymers that are functionalized intrinsically are made using several strategies including specially designed monomers and post polymerization …
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Controlling and Exploiting Spiropyran-based Mechanochromism
… properties are coupled to</p><p>molecular mechanochromic function, enabling at-a-glance visual cues that inform user</p><p>control. These properties are realized by covalently incorporating a spiropyran</p><p>mechanophore within poly(dimethylsiloxane) to indicate with a visible color change …