Browsing by Subject "Color contrast"

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    ItemOpen Access
    A complementary electrochromic device with highly improved performance based on brick-like hydrated tungsten trioxide film
    (American Scientific Publishers, 2012) Jiao, Z.; Wang, J.; Ke, L.; Sun, X. W.; Demir, Hilmi Volkan
    Uniform and well adhesive nanostructured hydrated tungsten trioxide (3WO 3•H 2O) films were grown on fluorine doped tin oxide (FTO) substrate via a facile and template-free crystal-seed-assisted hydrothermal method by addition of ammonium sulfate ((NH 4) 2SO 4) and hydrogen peroxide (H 2O 2). X-ray diffraction (XRD) studies indicated that the films are of orthorhombic structure. Scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM) analysis showed that the film was composed of brick-like nanostructures with a preferred growing direction along (002). The influence of seed layer, (NH 4) 2SO 4 and H 2O 2 on the products were also studied. The film showed good cyclic stability, comparable switching speed and coloration efficiency (30.1 cm 2 C -1). A complementary electrochromic device based on the film and Prussian blue depicted highly improved color contrast, coloration/bleaching response (1.8 and 3.7 s respectively) and coloration efficiency (164.6 cm 2 C -1).
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    ItemOpen Access
    Psychological color effects
    (Springer, 2016) Olguntürk, Nilgün; Ronnier, L.
    Colors may alter people’s percepts and may affect how they feel. Colors with their psychological effects are most studied under three main areas: advancing and receding/retreating colors, in relation to temperature (warm vs. cool) and in relation to emotions. Advancing and receding/retreating colors are related with visual perception where people tend to see some colors as if they are closer than they actually are or vice versa. The effect of color on warmth perception is related with feeling warm, which could be a physical or sensorial effect. In this case, some colors may increase or decrease the feeling of warmth, although the actual physical temperature remains the same. In relation to emotion, people’s emotions may alter when they are exposed to different colors. There may be even more ways that colors may effect percepts and emotions, but the most studied three topics will be expanded in this overview.