Pinus sylvestris L. needle surface wettability parameters as indicators of atmospheric environment pollution impacts: Novel contact angle hysteresis methodology
PBN-AR
Instytucja
Wydział Matematyczno-Przyrodniczy (Akademia Pomorska w Słupsku)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Applied Surface Science
ISSN
0169-4332
EISSN
Wydawca
ELSEVIER SCIENCE BV
DOI
URL
Rok publikacji
2014
Numer zeszytu
Strony od-do
857–866
Numer tomu
292
Identyfikator DOI
Liczba arkuszy
0,6
Autorzy
(liczba autorów: 3)
Pozostali autorzy
+ 2
Słowa kluczowe
en
Pinus sylvestris L. needle
Air pollution
Surface wettability
Contact angle hysteresis
Surface energetics
Microroughness quantification
Streszczenia
Język
en
Treść
An investigation of water contact angles (CAs), contact angle hysteresis (CAH) was carried out for 1-year to 4-year old needles (Pinus sylvestris) collected in urban (Gdansk) and rural (Karsin) locations using an original measuring technique based on the geometry of the drop on a vertical filament. Concentrations of air pollutants (SO2, NOx, C6H6, and suspended particular matter – SPM) currently considered to be most important in causing direct damage to vegetation were simultaneously monitored. A set of the surface wettability parameters: the apparent surface free energy γSV, adhesive film tension Π, work of adhesion WA, and spreading WS, were determined from CAH data using the approach developed by Chibowski (2003) to quantify the surface energetics of the needle substrata affected by aging and pollution impacts. This formalism relates the total apparent surface free energy of the solid γSV with only three measurable quantities: the surface tension of the probe liquid γLV and its advancing θA and receding θR contact angle hysteresis. Since CAH depends on the outermost wax layer surface roughness and spatial physicochemical heterogeneity of a solid surface, CA data were corrected using surface architecture profiles registered with confocal scanning laser microscopy. It was found that the roughness parameter r is significantly negatively correlated (R = −0.74) with the needle age (collected at Karsin). The needle surface aging process resulted in its surface hydrophilization (CA↓ and CAH↓ with γSV↑ and WA↑). A temporal evolution of the needles wettability was traced with the data point distribution in the 2D space of CAH plotted versus WS. The wettability parameters were closely correlated to pollutant concentrations as evidenced from Spearman's rank correlation procedure (R = 0.63–0.91; p < 0.05). The aim of the study was to validate the established CA methodology to create a new non-invasive, low-cost technique suitable for monitoring of structural changes at interfaces of biological systems.
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
630837
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