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Facile Synthesis of Island-like ZrOsub.2-VOsub.2 Composite Films with Enhanced Thermochromic Performance for Smart Windows
VO[sub.2]-based film, as a very promising thermochromic material for smart windows, has attracted extensive attention but has not been widely applied because it is difficult to simultaneously improve in terms of both solar-modulation efficiency (ΔT[sub.sol]) and visible transmittance (T[sub.lum]) when made using the magnetron-sputtering method, and it has poor durability when made using the wet chemical method. Herein, island-like ZrO[sub.2]-VO[sub.2] composite films with improved thermochromic performance (ΔT[sub.sol]: 12.6%, T[sub.lum]: 45.0%) were created using a simple approach combining a dual magnetron-sputtering and acid-solution procedure. The film's ΔT[sub.sol] and T[sub.lum] values were increased initially and subsequently declined as the sputtering power of the ZrO[sub.2] target was raised from 30 W to 120 W. ΔT[sub.sol] achieved its maximum of 12.6% at 60 W, and T[sub.lum] reached its maximum of 51.1% at 90 W. This is likely the result of the interaction of two opposing effects: Some VO[sub.2] nanocrystals in the composite film were isolated by a few ZrO[sub.2] grains, and some pores could utilize their surface-plasmon-resonance effect at high temperature to absorb some near-infrared light for an enhanced ΔT[sub.sol] and T[sub.lum]. More ZrO[sub.2] grains means fewer VO[sub.2] grains in the composite film and increased film thickness, which also results in a decrease in ΔT[sub.sol] and T[sub.lum]. As a result, this work may offer a facile strategy to prepare VO[sub.2]-based films with high thermochromic performance and promote their application in smart windows.
Journal Article
Transmitting Authority
Transmitting Authority reveals the interdependence between the textual and social history of the Zhongshuo and the rise and fall of the cultural currency of Wang Tong (ca. 584-617), a.k.a. Master Wenzhong, whose teachings this work purports to record.
eBook
Northward Expansion of a Warm-Water Doliolid IDolioletta gegenbauri/I into a Temperate Bay, China
A warm-water doliolid species Dolioletta gegenbauri (Uljanin, 1884) was firstly recorded in Jiaozhou Bay (JZB) during the autumn of 2019–2020. As a warm-water species, its native habitat lies in the East China Sea Shelf, >1000 km south of JZB. Distribution, abundance, stage composition, size frequency distribution, and relationships with environmental factors were studied. Both asexual and sexual reproduction stages were observed. Gonozooids generally dominated the population, indicating an active population development status. Abundance was significantly correlated to temperature. Water temperature in the two consecutive years was among the highest levels during the recent 3–4 decades. The continuous warming trends both in the China coastal seas and JZB likely expanded the biogeographic range. The sub branches of a boundary current, the Kuroshio Current, especially the Yellow Sea Warm Current, may play a central role during the northward extension. Moreover, its feeding, growth, reproduction, and recruitment could also be benefited from the neritic food environment. Finally, when the temperature dropped below 15 °C in the early winter, it disappeared in JZB. The seasonal expansion of D. gegenbauri in JZB could be facilitated by current transportation, warming, and the neritic environment.
Journal Article
