Surface properties of cork in relation to reactive washing

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abstract

Reactive washing consists of treating cork stoppers with hydrogen peroxide under strong alkaline conditions at elevated temperature. This causes changes in the surface of the stoppers, affecting their wettability. This study aimed to relate the reactive washing with changes in the surface properties of cork stoppers and their affinity for hydroalcoholic solutions with different concentrations of ethanol. The surface composition was evaluated by Fourier Transform Infrared-Attenuated Total Reflectance spectroscopy, confocal Raman spectroscopy and the free surface energy by contact angle measurements with liquid probes using Owens-Wendt-Rabel-Kaelble method. The surface morphology and topology was assessed by scanning electron microscopy and 3D optical profilometry, respectively. Different wettability of the top and lateral of the cork stoppers is due to the difference in the exposure of phellogen cell wall layers. After reactive washing, the partial degradation of suberin and the increased exposure of hydrophilic biopolymers lead to an increase in the polar component of the free surface energy, thus promoting wettability with aqueous solutions. The changes in the surface observed imply an enhancement in the wettability of cork stoppers towards hydroalcoholic solutions mimicking alcoholic beverages, as revealed by modeling studies employing a wetting envelope.

keywords

CHEMICAL-COMPOSITION; FREE-ENERGY; VARIABILITY; STOPPERS; LIGNIN

subject category

Chemistry, Physical

authors

Branco, DG; Santiago, CA; Oliveira, FJ; Cabrita, L; Evtuguin, DV

our authors

foto Dmitry Evtyugin

Dmitry Evtyugin

Associate Professor with Aggregation
foto Filipe José Alves de Oliveira

Filipe José Alves de Oliveira

Principal Researcher

Groups

G3 - Electrochemical Materials, Interfaces and Coatings
G4 - Renewable Materials and Circular Economy

Projects

Novas Abordagens na desinfecção e branqueamento de rolhas de cortiça. (NEWASHCORK)

CICECO - Aveiro Institute of Materials (UIDB/50011/2020)

CICECO - Aveiro Institute of Materials (UIDP/50011/2020)

acknowledgements

This work was developed within the scope of the project NEW-ASHCORK (POCI-01-0247-FEDER-034048) financed by ANI and cofinanced by FEDER and supported by CICECOAveiro Institute of Materials, UIDB/50011/2020 and UIDP/50011/2020, financed by national funds through the Portuguese Foundation for Science and Technology/MCTES.

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Publication Details

type
Journal Article
year
2021
journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
volume
624
article number
126762
publisher
ELSEVIER
issn
0927-7757
isbn
1873-4359
digital object identifier
10.1016/j.colsurfa.2021.126762
web of science article identifier
WOS:000660689900001

Journal Metrics (JCR 2019)

Journal Impact Factor
3.99
Journal Impact Factor (5 yrs)
3.48
category normalized journal percentile
63.836

Citations

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