Photoinduced cooling effect of water-retentive composite of TiO2 and saponite

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science Pub Date : 2025-01-24 DOI:10.1016/j.clay.2025.107712

Yosuke Kageshima , Koharu Yagawa , Katsuya Teshima , Hiromasa Nishikiori

{"title":"Photoinduced cooling effect of water-retentive composite of TiO2 and saponite","authors":"Yosuke Kageshima , Koharu Yagawa , Katsuya Teshima , Hiromasa Nishikiori","doi":"10.1016/j.clay.2025.107712","DOIUrl":null,"url":null,"abstract":"<div><div>TiO<sub>2</sub> coating of a building envelope is expected to contribute to the mitigation of the heat-island effect because of the photoinduced cooling effect. However, the limited water adsorbability and retentivity of the TiO<sub>2</sub> thin film can require successive sprinkling of water onto a building to achieve the sufficient cooling effect. In this study, a thin film consisting of a mixture of TiO<sub>2</sub> and saponite was prepared through a sol–gel method. The high water retentivity of saponite was found to enhance the photoinduced cooling effect of the TiO<sub>2</sub>-based thin film. The photoinduced temporal change in the water adsorbability and retentivity of the highly hydrophilic composite was successfully monitored by using a hydrophilic xanthene dye adsorbed onto the coating as a probe. The effect of environmental humidity on the photoinduced cooling effect was also investigated. We found that higher humidity in the surrounding environment triggered stronger photoinduced cooling effects of the composite film. Especially during summer in Japan, when humidity is high, the TiO<sub>2</sub>–saponite composite film did not require intentional water sprinkling to achieve cooling effects.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"267 ","pages":"Article 107712"},"PeriodicalIF":5.3000,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Clay Science","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0169131725000171","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}

引用次数: 0

Abstract

TiO₂ coating of a building envelope is expected to contribute to the mitigation of the heat-island effect because of the photoinduced cooling effect. However, the limited water adsorbability and retentivity of the TiO₂ thin film can require successive sprinkling of water onto a building to achieve the sufficient cooling effect. In this study, a thin film consisting of a mixture of TiO₂ and saponite was prepared through a sol–gel method. The high water retentivity of saponite was found to enhance the photoinduced cooling effect of the TiO₂-based thin film. The photoinduced temporal change in the water adsorbability and retentivity of the highly hydrophilic composite was successfully monitored by using a hydrophilic xanthene dye adsorbed onto the coating as a probe. The effect of environmental humidity on the photoinduced cooling effect was also investigated. We found that higher humidity in the surrounding environment triggered stronger photoinduced cooling effects of the composite film. Especially during summer in Japan, when humidity is high, the TiO₂–saponite composite film did not require intentional water sprinkling to achieve cooling effects.

Abstract Image

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...