| The permeability of cork to gases. | |
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MedLine Citation:
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PMID: 21434693 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The permeability of gases through uncompressed cork was investigated. More than one hundred samples were assessed from different plank qualities to provide a picture of the permeability distribution. A novel technique based on a mass spectrometer leak detector was used to directly measure the helium flow through the central area of small discs having 10 mm in diameter and 2 mm thickness. The permeability for nitrogen, oxygen and other gases was measured by the pressure rise technique. Boiled and non boiled cork samples from different sections were evaluated. An asymmetric frequency distribution ranging 3 orders of magnitude (roughly from 1 to 1000 µmol/(cm.atm.day)) for selected samples without macroscopic defects was found, having a peak below 100 µmol/(cm.atm.day). Correlation was found between density and permeability -; higher density samples tend to show lower permeability. However, we found that boiled cork showed a mean lower permeability despite having a lower density. The transport mechanism of gases through cork was also examined. Calculations suggest that gases permeate uncompressed cork mainly through small channels between cells under a molecular flow regime. The diameter of such channels was estimated, to be in the range of 100 nm, in agreement with the plasmodesmata size in the cork cell walls. |
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Authors:
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David Pedro Faria; Ana Luísa Fonseca; Helena Pereira; Orlando Mnd Teodoro |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-3-24 |
Journal Detail:
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Title: Journal of agricultural and food chemistry Volume: - ISSN: 1520-5118 ISO Abbreviation: - Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-3-25 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0374755 Medline TA: J Agric Food Chem Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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