The Surface Tension of Cork from Contact Angle Measurements

Gomes, C. M Castilho Pereira Santos; Fernandes, Anabela C.; Almeida, Bernardino de

doi:10.1006/jcis.1993.1099

Cited by 28 publications

(9 citation statements)

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“…The hydrophobic nature of cork was already observed by Abenojar et al [20], who detected a contact angle of natural cork between 90° and 100°. Similar results were obtained by Gomes et al [21] who observed an average contact angle of 84° ± 2°. These contact angle values are lower than those obtained in this study, and this can be ascribed to the difference between natural cork and agglomerated cork roughness.…”

Section: Surface Wettabilitysupporting

confidence: 90%

The Potential of Agglomerated Cork for Sandwich Structures: A Systematic Investigation of Physical, Thermal, and Mechanical Properties

et al. 2019

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Considering the major role played by sandwich structures in many fields where high stiffness-to-weight ratio is required, the selection of a suitable core material is of paramount importance. In order to face the environmental problems related to waste disposal, the selection of an eco-friendly core material is now included in the design criteria of sandwich structures. Agglomerated cork is recognized as a good solution that combines satisfactory mechanical performances and eco-sustainability. Many research studies individually addressed cork’s morphological, thermal, and mechanical features without providing a comprehensive overview of the relationships that exist between them. In this work, the investigation of the peculiar cork morphology allowed learning more about its good insulation capacity and its impressive recovery capability. The use of dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA) clarified the influence of temperature on both flexural and compressive performances. The effect of testing parameters such as temperature and speed on agglomerated cork properties was validated through statistical analysis. Moreover, to highlight agglomerated cork advantages and drawbacks, the work provides also a comparison with more traditional polyvinylchloride (PVC) foams commonly used in industrial applications.

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Section: Surface Wettabilitysupporting

confidence: 90%

The Potential of Agglomerated Cork for Sandwich Structures: A Systematic Investigation of Physical, Thermal, and Mechanical Properties

et al. 2019

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“…Gomes et al 108 were the first to measure contact angles and surface properties of cork. They found that nalkanes spread spontaneously on the surface with zero contact angle.…”

Section: Physical Propertiesmentioning

confidence: 99%

Cork: properties, capabilities and applications

Silva¹,

Sabino²,

Fernandes³

et al. 2008

International Materials Reviews

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Cork is a natural, renewable, sustainable raw material that has been used for many centuries. As a result of this very long term interest, the scientific literature on cork is extensive. The present review focuses on the chemical composition, physical and mechanical properties of cork and on its products and sub-products. The substantial efforts to fully characterise cork, as well as new developments and evolving research, are reviewed, beginning with its histology, growth and morphology (at macro-and microscales). The chemical structure is analysed in detail, covering both the materials that form the wall structure and the low molecular weight, extractable components. The unique properties of cork are discussed and correlated with current knowledge on morphology and chemical structure. Finally, the important industrial applications of cork are reviewed, in the context of research to provide cork with novel, high added-value applications.

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“…This conclusion is also corroborated by the visual observation of the water droplets in Figure 37, set down on agglomerated cork NL20 and PVC foam HP130 during wettability tests. Cork hydrophobic nature was already pinpointed by Abenojar et al [161] who found out a contact angle between 90° and 100° for natural cork, and by Gomes et al [162] who obtained similar results and in particular an average contact angle of 84° ± 2°. The contact angle values reported in literature are lower than those reported in this study and this discrepancy can be explained considering the difference in surface roughness that arises between agglomerated and natural cork.…”

Section: Wettabilitymentioning

confidence: 65%