@article {Faria2011,
	title = {{Permeability of cork to gases}},
	journal = {Journal of agricultural and food chemistry},
	volume = {59},
	number = {8},
	year = {2011},
	note = {<p>n/a</p>
},
	pages = {3590{\textendash}3597},
	abstract = {<p>The permeability of gases through uncompressed cork was investigated. More than 100 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 disks 10 mm in diameter and 2 mm thick. The permeability for nitrogen, oxygen, and other gases was measured by the pressure rise technique. Boiled and nonboiled cork samples from different sections were evaluated. An asymmetric frequency distribution ranging 3 orders of magnitude (roughly from 1 to 1000 $μ$mol/(cm{\textperiodcentered}atm{\textperiodcentered}day)) for selected samples without macroscopic defects was found, having a peak below 100 $μ$mol/(cm{\textperiodcentered}atm{\textperiodcentered}day). Correlation was found between density and permeability: higher density samples tend to show lower permeability. However, 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.</p>
},
	keywords = {Gases, permeability, Quercus},
	issn = {1520-5118},
	doi = {10.1021/jf200491t},
	url = {http://www.ncbi.nlm.nih.gov/pubmed/21434693},
	attachments = {https://docentes.fct.unl.pt/sites/default/files/odt/files/2011_permeability_of_cork.pdf , https://docentes.fct.unl.pt/sites/default/files/odt/files/2011_permeability_of_cork_0.pdf},
	author = {Faria, David P and Fonseca, Ana L and Pereira, Helen and Teodoro, Orlando M. N. D.}
}
