Long-term effect of weather in Dfb climate subtype on properties of hydrophobic coatings on sandstone

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27640%2F22%3A10249524" target="_blank" >RIV/61989100:27640/22:10249524 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989100:27710/22:10249524 RIV/68145535:_____/22:00564367

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S2352710222003965" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2352710222003965</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jobe.2022.104383" target="_blank" >10.1016/j.jobe.2022.104383</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Long-term effect of weather in Dfb climate subtype on properties of hydrophobic coatings on sandstone

Popis výsledku v původním jazyce

Hydrophobic poly(alkyl siloxane) coatings (pure and containing 0.5 wt.% of nano-ZnO) were applied by spraying on sandstone. Coated (S/P and S/PZnO) and uncoated (S) samples were characterized and exposed to weather for 545 days in Ostrava, Czech Republic, an industrial city having persistently high concentrations of particulate matter in air (PM10 ~ 20+-10 μg/m3) and belonging to the Dfb climate subtype. Despite the more distinct final colour change of S/P and S/PZnO front faces, the differences between front and back faces were significantly smaller (ΔE*F-B values of ~3.7 and ~3.1 for S/P and S/PZnO, respectively) compared to S (ΔE*F-B ~ 7.7). Correlations of colour changes with meteorological data revealed effect of relative air humidity, total precipitation, and concentration of particulate matter. Static contact angle (initial values of 137o and 142o for S/P and S/PZnO, respectively) remained &gt;120o during the experiment, and the coatings effectively prevented the falling rainwater to soak into the sandstone. The high hydrophobicity was not accompanied by closure of pores. Despite a decrease in Zn content, no algae was observed on S/PZnO during the experiment. On S and S/P samples, the algae was found after 473 days.

Název v anglickém jazyce

Long-term effect of weather in Dfb climate subtype on properties of hydrophobic coatings on sandstone

Popis výsledku anglicky

Hydrophobic poly(alkyl siloxane) coatings (pure and containing 0.5 wt.% of nano-ZnO) were applied by spraying on sandstone. Coated (S/P and S/PZnO) and uncoated (S) samples were characterized and exposed to weather for 545 days in Ostrava, Czech Republic, an industrial city having persistently high concentrations of particulate matter in air (PM10 ~ 20+-10 μg/m3) and belonging to the Dfb climate subtype. Despite the more distinct final colour change of S/P and S/PZnO front faces, the differences between front and back faces were significantly smaller (ΔE*F-B values of ~3.7 and ~3.1 for S/P and S/PZnO, respectively) compared to S (ΔE*F-B ~ 7.7). Correlations of colour changes with meteorological data revealed effect of relative air humidity, total precipitation, and concentration of particulate matter. Static contact angle (initial values of 137o and 142o for S/P and S/PZnO, respectively) remained &gt;120o during the experiment, and the coatings effectively prevented the falling rainwater to soak into the sandstone. The high hydrophobicity was not accompanied by closure of pores. Despite a decrease in Zn content, no algae was observed on S/PZnO during the experiment. On S and S/P samples, the algae was found after 473 days.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20100 - Civil engineering

Projekt

<a href="/cs/project/DG18P02OVV017" target="_blank" >DG18P02OVV017: Historická krajina na pomezí Slezska a Moravy</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Building Engineering

ISSN

2352-7102

e-ISSN

2352-7102

Svazek periodika

52

Číslo periodika v rámci svazku

July

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

15

Strana od-do

nestrankovano

Kód UT WoS článku

000880180400001

EID výsledku v databázi Scopus

2-s2.0-85126684702