Photochromic Smart Windows Employing WO3-Based Composite Films

Miyazaki, Hitoshi; Ishigaki, Takumi; Ota, Toshitaka

doi:10.5539/jmsr.v6n4p62

Cited by 12 publications

(5 citation statements)

References 11 publications

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“…Considering our results against literature reports on ceramics, we reinforce the impression noted above: investigation of ceramics is related largely to their applications. Thus, WO 3 -based composites can be used in photochromic smart windows (Miyazaki, Ishigaki, & Ota, 2017). Electric generation characteristics of piezoelectric ceramics was studied under cyclic bending loading (Yang et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Scratch Testing of Hard Ceramics: Manifestation of Viscoelasticity

Brostow¹,

Hnatchuk²,

Prażuch³

2019

JMSR

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Viscoelasticity is studied extensively in polymers and polymer-based composites-but hardly in ceramics. We have studied viscoelastic behavior of three ceramics as manifested in scratching tests: 98 weight % B 4 C + 2% hexagonal boron nitride (h-BN), 92% B 4 C and 8% h-BN, 91% B 4 C + 5% CrSi 2 + 2% h-BN. Clear viscoelastic recovery (the groove depth becoming shallower within 2 minutes) is seen in all three materials, the recovery in each case of at least 90%. Taking into account viscoelasticity and introducing appropriate additives, one could significantly improve the scratch resistance of the boron carbides, and possibly of other hard ceramics as well.

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Section: Discussionmentioning

confidence: 99%

Scratch Testing of Hard Ceramics: Manifestation of Viscoelasticity

Brostow¹,

Hnatchuk²,

Prażuch³

2019

JMSR

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“…A literature review of the most recent studies on smart windows is summarized in Table 1 . Although the majority of studies examine the influence of thermochromic [19][20][21][22][23][24][25][26], electrochromic [27][28][29][30], and gasochromic coatings [31][32][33] on building energy consumption, CO 2 emission, heading, and cooling load [34][35][36], only a few studies has focused on the photochromic coating and its application in the built environment [14][15][16][17][18]. Additionally, among studies of smart windows with photochromic coatings, the effect of such coating on occupants' visual comfort has not been adequately explored.…”

Section: Of 16mentioning

confidence: 99%

The Effect of Smart Colored Windows on Visual Performance of Buildings

2022

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The photochromic coating is a promising smart technology that provides different optical properties in response to daylight variations. The application of photochromic coatings with various colors/shades on window glass is one of the current research approaches for finding better energy saving techniques. The aim of this study was to develop a series of photochromic coatings for window glass and measure the impact of such smart technologies on occupants’ visual comfort. This paper examines the visual performance of building facades that utilize windows with different photochromic-coated glass. The visual performance data of three window types coated with nine different photochromic color shades were considered and compared to determine the best photochromic shades and window types that provide optimum visual metrics for the inside of the building. The results show that compared to no-coating glass, both the Daylight Glare Probability and the Useful Daylight Illuminance could be improved by using multi-color coatings that contain equal or different color proportions for photochromic window glass. From an energy-saving point of view, the results indicate that the windows coated with photochromic materials provide a better alternative to the no-coating window products.

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“…Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. in smart windows [13] and optoelectronics [14]. In bulk form, WO 3 is a large indirect bandgap n-type semiconductor, with bandgap values reported in the 2.6-3.0 eV range [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Influence of crystal structure and oxygen vacancies on optical properties of nanostructured multi-stoichiometric tungsten suboxides

et al. 2022

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Four distinct tungsten suboxide (WO3-x) nanomaterials were synthesized via chemical vapour transport reaction and the role of their crystal structures on the optical properties was studied. These materials grow either as thin, quasi-2D crystals with the WnO3n-1 formula (in shape of platelets or nanotiles), or as nanowires (W5O14, W18O49). For the quasi-2D materials, the appearance of defect states gives rise to two indirect absorption edges. One is assigned to the regular bandgap occurring between the valence and the conduction band, while the second is a defect-induced band. While the bandgap values of platelets and nanotiles are in the upper range of the reported values for the suboxides, the nanowires’ bandgaps are lower due to the higher number of free charge carriers. Both types of nanowires sustain localized surface plasmon resonances, as evidenced from the extinction measurements, whereas the quasi-2D materials exhibit excitonic transitions. All four materials have photoluminescence emission peaks in the UV region. The interplay of the crystal structure, oxygen vacancies and shape can result in changes in optical behaviour, and the understanding of these effects could enable intentional tuning of selected properties.

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Photochromic Smart Windows Employing WO3-Based Composite Films

Cited by 12 publications

References 11 publications

Scratch Testing of Hard Ceramics: Manifestation of Viscoelasticity

Scratch Testing of Hard Ceramics: Manifestation of Viscoelasticity

The Effect of Smart Colored Windows on Visual Performance of Buildings

Influence of crystal structure and oxygen vacancies on optical properties of nanostructured multi-stoichiometric tungsten suboxides

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