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|Title: ||The cellular structure of cork from Quercus cerris var. cerris bark in a materials' perspective|
|Authors: ||Sen, Ali|
|Keywords: ||Quercus cerris|
|Issue Date: ||2011|
|Citation: ||"Industrial Crops and Products". ISSN 0926-6690. 34 (2011) 929-936|
|Abstract: ||Cork in the outer bark of trees is among the valuable raw materials of biological origin due to properties
that result mainly from its cellular structure. Large scale commercial utilization of cork has been only
achieved with cork from Quercus suber. Another oak species, Quercus cerris, also contains substantial,
albeit not continuous, regions of cork that are clearly visible to the naked eye but are so far considered
as a waste material.
Bark samples of Q. cerris var. cerris trees were collected from the Andırın province, Turkey. Cork portions
were separated and their cellular structure was investigated with optical and electron scanning
microscopy observations. The results were compared with Q. suber cork.
Q. cerris cork has the typical features of cork tissues with a regular and radially aligned structure of
suberized cells without intercellular voids, showing a ring structure and a distinction of earlycork and
latecork cells. Solid volume fraction was estimated at 25% (22% in earlycork, 36% in latecork).
In Q. cerris cork cells are smaller, cell wall thickness and solid volume fraction are higher, and the tissue
is less homogeneous with a higher content of lignified inclusions than in Q. suber cork. These factors
will negatively influence quality in regard to density and mechanical properties associated to elasticity.
However, this does not impair its use for production of granulates and agglomerates, e.g. for insulation
and energy absorption. Separation of the cork fraction from the bark is a step required before further
processing and use.|
|Description: ||Available at ScienceDirect|
|Peer Reviewed: ||yes|
|Publisher version: ||www.elsevier.com/locate/indcrop|
|Appears in Collections:||DRAT - Artigos de Revistas|
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